Updated README file.
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README.md
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README.md
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---
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title: ""
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---
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Introduction
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============
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SlunkCrypt is an experimental cryptography library and command-line tool.
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SlunkCrypt is an experimental cryptography library and command-line tool. See [*encryption algorithm*](#encryption-algorithm) for details.
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Legal Warning
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=============
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Use of SlunkCrypt may be illegal in countries where encryption is outlawed. We believe it is legal to use SlunkCrypt in many countries all around the world, but we are not lawyers, and so if in doubt you should seek legal advice before downloading it. You may find useful information at [cryptolaw.org](http://www.cryptolaw.org/), which collects information on cryptography laws in many countries, but we can't vouch for its correctness.
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Use of SlunkCrypt may be illegal in countries where encryption is outlawed. We believe it is legal to use SlunkCrypt in many countries all around the world, but we are not lawyers, and so if in doubt you should seek legal advice before downloading it. You may find useful information at [cryptolaw.org](http://www.cryptolaw.org/), which collects information on cryptography laws in many countries.
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Command-line Usage
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@ -99,15 +102,15 @@ Encryption algorithm
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The SlunkCrypt algorithm is based on concepts of the well-known [**Enigma**](https://en.wikipedia.org/wiki/Enigma_machine) machine, but with various improvements:
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- The original Enigma machine had only *three* rotors (spinning wheels), plus a static "reflector" wheel. In SlunkCrypt, we uses **256** simulated rotors.
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- The original Enigma machine had only *three* rotors (spinning wheels), plus a static "reflector" wheel. In SlunkCrypt, we uses **256** simulated rotors – because we can.
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- The original Enigma machine supported only 26 distinct symbols, i.e. the letters `A` to `Z`. In SlunkCrypt, we use **256** distinct symbols, i.e. the byte values `0x00` to `0xFF`, which allows the encryption (and decryption) of arbitrary steams of bytes, rather than just plain text. Of course, SlunkCrypt can encrypt (and decrypt) plain text as well.
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- The original Enigma machine supported only 26 distinct symbols, i.e. the letters `A` to `Z`. In SlunkCrypt, we use **256** distinct symbols, i.e. the byte values `0x00` to `0xFF`, which allows the encryption (and decryption) of arbitrary streams of bytes, rather than just plain text. Of course, SlunkCrypt can encrypt (and decrypt) text files as well.
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- In the original Enigma machine, the signal passes through the rotors *twice*, once in forward direction and then again in backwards direction – thus the "reflector" wheel. This way, the Enigma's encryption was made *involutory*, i.e. encryption and decryption were the same operation. While this was highly convenient, it also severely weakened the cryptographic strength of the Enigma maschine, because the number of possible permutations was reduced drastically! This is one of the main reasons why the Enigma machine eventually was defeated. In SlunkCrypt, the signal passes through the simulated rotors just *once*, in order to maximize the number of possible permutations. This eliminates the most important known weakness of the Enigma machine. Obviously, in SlunkCrypt, separate modes for encryption and decryption need to be provided, because encryption and decryption *no* longer are the same.
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- In the original Enigma machine, the signal passes through the rotors *twice*, once in forward direction and then again in backwards direction – thus the "reflector" wheel. This way, the Enigma's encryption was made *involutory*, i.e. encryption and decryption were the same operation. While this was highly convenient, it also severely weakened the cryptographic strength of the Enigma machine, because the number of possible permutations was reduced drastically! This is one of the main reasons why the Enigma machine eventually was defeated. In SlunkCrypt, the signal passes through the simulated rotors just *once*, in order to maximize the number of possible permutations. This eliminates the most important known weakness of the Enigma machine. Obviously, in SlunkCrypt, separate modes for encryption and decryption need to be provided, because encryption and decryption *no* longer are the same.
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- In the original Enigma machine, *only* the rightmost rotor was stepped after every symbol. The other rotors were stepped infrequently. Specifically, if one rotor has completed a full turn, it will carry on the next wheel by one step – much like the odometer in a car. The fact that most of the rotors remained in the same position for a long time was another important weakness of the Enigma machine that ultimately lead to its demise. Furthermore, the positions of the Enigma's rotors would repeat after only 16,900 characters. In SlunkCrypt an improved stepping algorithm is used, which ensures that *all* rotors are stepped at an equal frequency. At the same time, the rotor positions in SlunkCrypt practically *never* repeat.
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- In the original Enigma machine, *only* the rightmost rotor was stepped after every symbol. The other rotors were stepped infrequently. Specifically, if one rotor has completed a full turn, it will cause the next rotor to move by one step – much like the odometer in a car. The fact that most of the rotors remained in the same position for a long time was another important weakness of the Enigma machine that ultimately lead to its demise. Furthermore, the positions of the Enigma's rotors would start to repeat after 16,900 characters. In SlunkCrypt an improved stepping algorithm is used, which ensures that *all* rotors are stepped often. At the same time, the rotor positions in SlunkCrypt *never* repeat (practically).
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- The internal wiring of each of the original Enigma machine's rotors was *fixed*. Each rotor came with a different internal wiring (i.e. permutation). Some models even had more than three rotors to choose from, but only three rotors were used at a time. Nonetheless, TTBOMK, the internal wiring of each of the supplied rotors was *never* changed, for a specific model. This severely restricted the key space of the Enigma machine, as far as the rotors are concerned, because *only* the order of the rotors and the initial position of each rotor could be varied. In SlunkCrypt, a fully randomized wiring is generated from the password, using a [PRNG](https://en.wikipedia.org/wiki/Pseudorandom_number_generator), for each of the 256 simulated rotors. The initial rotor positions are randomized as well.
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- The internal wiring of each of the original Enigma machine's rotors was *fixed*. Each rotor came with a different internal wiring (i.e. permutation). Some models even had more than three rotors to choose from, but only three rotors were used at a time. Nonetheless, TTBOMK, the internal wiring of each of the supplied rotors was *never* changed, for a specific model. This severely restricted the key space of the Enigma machine, as far as the rotors are concerned, because *only* the order of the rotors and the initial position of each rotor could be varied. In SlunkCrypt, a fully *randomized* wiring (i.e. permutation) is generated from the password for each of the 256 simulated rotors. The initial rotor positions are *randomized* as well.
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- SlunkCrypt does **not** currently implement the *plugboard* of the original Enigma machine. That is because, even though the plugboard has a large key space, it effectively is just a *fixed* substitution cipher that does **not** contribute much to the cryptographic strength of the Enigma machine. In fact, the [bombe](https://en.wikipedia.org/wiki/Bombe#Stecker_values) was able to circumvent the plugboard.
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@ -131,6 +134,7 @@ Allocate and initialize a new SlunkCrypt encryption/decryption context.
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);
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***Parameters:***
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* `nonce`
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The *nonce* (number used once) to be used for the encryption/decryption process. The purpose of the nonce is to ensure that each message will be encrypted differently, even when the same password is used to encrypt *multiple* (possibly identical) messages. Therefore, a new *random* nonce **must** be chosen for each message to be encrypted! It is *not* necessary to keep the nonce confidential, but the same nonce **must** be used for both, encryption *and* decryption. Typically, the nonce is stored/transmitted alongside the ciphertext.
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@ -145,6 +149,7 @@ Allocate and initialize a new SlunkCrypt encryption/decryption context.
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The length of password given by the `passwd` parameter, in bytes, **not** counting a terminating NULL character. The minimum/maximum length of the password are given by the `SLUNKCRYPT_PWDLEN_MIN` and `SLUNKCRYPT_PWDLEN_MAX` constants, respectively.
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***Return value:***
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* If successful, a handle to the new SlunkCrypt context is return; otherwise `SLUNKCRYPT_NULL` is returned.
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*Note:* Applications **should** treat `slunkcrypt_t` as an *opaque* handle type. Also, as soon as the SlunkCrypt context is *not* needed anymore, the application **shall** call `slunkcrypt_free()` in order to "clear" and de-allocate that context.
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@ -161,8 +166,9 @@ Re-initialize an existing SlunkCrypt encryption/decryption context.
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);
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***Parameters:***
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* `context`
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The existing SlunkCrypt context to be re-initialized. This must be a valid handle that was returned by a previous invocation of the `slunkcrypt_alloc()` function and that has **not** been `free`'d since then.
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The existing SlunkCrypt context to be re-initialized. This must be a valid handle that was returned by a previous invocation of the `slunkcrypt_alloc()` function.
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* `nonce`
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Please refer to the `slunkcrypt_alloc()` function for details!
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@ -174,6 +180,7 @@ Re-initialize an existing SlunkCrypt encryption/decryption context.
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Please refer to the `slunkcrypt_alloc()` function for details!
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***Return value:***
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* If successful, `SLUNKCRYPT_SUCCESS` is returned; otherwise `SLUNKCRYPT_FAILURE` or `SLUNKCRYPT_ABORTED` is returned.
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### slunkcrypt_free()
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);
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***Parameters:***
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* `context`
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The existing SlunkCrypt context to be de-allocated. This must be a valid handle that was returned by a previous invocation of the `slunkcrypt_alloc()` function and that has **not** been `free`'d since then.
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The existing SlunkCrypt context to be de-allocated. This must be a valid handle that was returned by a previous invocation of the `slunkcrypt_alloc()` function.
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*Note:* Once a handle has been passed to this function, that handle is *invalidated* and **must not** be used again!
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@ -199,10 +207,12 @@ Generate a new random *nonce* (number used once), using the system's "cryptograp
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);
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***Parameters:***
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* `nonce`
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A pointer to a variable of type `int64_t` that receives the new random nonce.
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***Return value:***
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* If successful, `SLUNKCRYPT_SUCCESS` is returned; otherwise `SLUNKCRYPT_FAILURE` or `SLUNKCRYPT_ABORTED` is returned.
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### slunkcrypt_encrypt()
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);
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***Parameters:***
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* `context`
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The existing SlunkCrypt context to be used for encrypting the message chunk. This context will be updated.
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@ -234,6 +245,7 @@ Encrypt the next message chunk, using separate input/output buffers.
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The length of the plaintext chunk contained in the *input* buffer given by the `input` parameter, in bytes. At the same time, this determines the minimum required size of the *output* buffer given by the `output` parameters, in bytes.
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***Return value:***
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* If successful, `SLUNKCRYPT_SUCCESS` is returned; otherwise `SLUNKCRYPT_FAILURE` or `SLUNKCRYPT_ABORTED` is returned.
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### slunkcrypt_encrypt_inplace()
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);
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***Parameters:***
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* `context`
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The existing SlunkCrypt context to be used for encrypting the message chunk. This context will be updated.
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The length of the plaintext chunk initially contained in the input/output buffer given by the `buffer` parameter, in bytes. At the same time, this determines the portion of the input/output buffer that will be overwritten with encrypted data, in bytes.
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***Return value:***
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* If successful, `SLUNKCRYPT_SUCCESS` is returned; otherwise `SLUNKCRYPT_FAILURE` or `SLUNKCRYPT_ABORTED` is returned.
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### slunkcrypt_decrypt()
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);
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***Parameters:***
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* `context`
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The existing SlunkCrypt context to be used for decrypting the ciphertext chunk. This context will be updated.
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The length of the ciphertext chunk contained in the *input* buffer given by the `input` parameter, in bytes. At the same time, this determines the minimum required size of the *output* buffer given by the `output` parameters, in bytes.
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***Return value:***
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* If successful, `SLUNKCRYPT_SUCCESS` is returned; otherwise `SLUNKCRYPT_FAILURE` or `SLUNKCRYPT_ABORTED` is returned.
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### slunkcrypt_decrypt_inplace()
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);
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***Parameters:***
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* `context`
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The existing SlunkCrypt context to be used for decrypting the ciphertext chunk. This context will be updated.
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The length of the ciphertext chunk initially contained in the input/output buffer given by the `buffer` parameter, in bytes. At the same time, this determines the portion of the input/output buffer that will be overwritten with decrypted data, in bytes.
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***Return value:***
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* If successful, `SLUNKCRYPT_SUCCESS` is returned; otherwise `SLUNKCRYPT_FAILURE` or `SLUNKCRYPT_ABORTED` is returned.
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### slunkcrypt_random_bytes()
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@ -327,6 +345,7 @@ Generate a sequence of random bytes, using the system's "cryptographically secur
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);
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***Parameters:***
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* `buffer`
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A pointer to the *output* buffer where the random bytes will be stored.
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@ -336,6 +355,7 @@ Generate a sequence of random bytes, using the system's "cryptographically secur
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The number of random bytes to be generated. At the same time, this determines the minimum required size of the *output* buffer given by the `output` parameters, in bytes.
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***Return value:***
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* If successful, the number of random bytes that have been generated and stored to the *output* buffer is returned; otherwise `0` is returned.
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The number of generated bytes can be *at most* `length`. Less than `length` bytes *may* be generated, if the entropy source could **not** provide the requested number of bytes at this time. In that case, you can try again.
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);
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***Parameters:***
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* `buffer`
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A pointer to the buffer whose content is to be erased.
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);
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***Parameters:***
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* `passwd`
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The password to "protect" the message. The password is given as an `std::string`, e.g. UTF-8 encoded characters. The same password **may** be used to encrypt *multiple* messages. Also, the same password **must** be used for both, encryption *and* decryption; it will *only* be possible decrypt the ciphertext, if the "correct" password is known. The password must be kept confidential under all circumstances!
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*Note:* In order to thwart *brute force* attacks, it is recommended to choose a "random" password that is at least 12 characters in length and that consists of upper-case characters, lower-case characters, digits as well as other "special" characters.
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***Exceptions:***
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* Throws `std::runtime_error`, if the nonce could not be generated, or if the SlunkCrypt context could not be allocated.
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#### SlunkCryptEncr::encrypt() [1]
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The length of the plaintext chunk contained in the *input* buffer given by the `input` parameter, in bytes. At the same time, this determines the minimum required size of the *output* buffer given by the `output` parameters, in bytes.
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***Return value:***
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* If successful, `true` is returned; otherwise `false` is returned.
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#### SlunkCryptEncr::encrypt() [2]
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@ -434,6 +458,7 @@ Encrypt the next message chunk, using separate input/output containers (`std::ve
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The `output.size()` must be *greater than or equal* to `input.size()`. If the `output.size()` is larger than the `input.size()`, then only the first `input.size()` elements of `output` will be filled with encrypted data!
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***Return value:***
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* If successful, `true` is returned; otherwise `false` is returned. The function fails, if the *output* `std::vector` is too small.
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#### SlunkCryptEncr::encrypt_inplace() [1]
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);
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***Parameters:***
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* `buffer`
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A pointer to the buffer initially containing the next chunk of the plaintext to be encrypted. The plaintext is given as a byte array (`uint8_t`). This can be arbitrary binary data, e.g. UTF-8 encoded text. NULL bytes are **not** treated specially. The ciphertext chunk that corresponds to the given plaintext chunk will be stored to the *same* buffer, thus replacing the plaintext data.
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The length of the plaintext chunk initially contained in the input/output buffer given by the `buffer` parameter, in bytes. At the same time, this determines the portion of the input/output buffer that will be overwritten with encrypted data, in bytes.
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***Return value:***
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* If successful, `true` is returned; otherwise `false` is returned.
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#### SlunkCryptEncr::encrypt_inplace() [2]
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);
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***Parameters:***
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* `buffer`
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A reference to the `std::vector<uint8_t>` initially containing the next chunk of the plaintext to be encrypted. This can be arbitrary binary data, e.g. UTF-8 encoded text. NULL bytes are **not** treated specially. The ciphertext chunk that corresponds to the given plaintext chunk will be stored to the *same* `std::vector<uint8_t>`, thus replacing all the plaintext data.
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***Return value:***
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* If successful, `true` is returned; otherwise `false` is returned.
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#### SlunkCryptEncr::get_nonce()
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uint64_t get_nonce();
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***Return value:***
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* Returns the nonce that is used to encrypt the message. The purpose of the nonce is to ensure that each message will be encrypted differently, even when the same password is used to encrypt multiple (possibly identical) messages. Therefore, a new random nonce must be chosen for each message! It is not necessary to keep the nonce confidential, but the same nonce must be used for both, encryption and decryption. Typically, the nonce is stored/transmitted alongside the ciphertext.
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*Note:* The `SlunkCryptEncr` class automatically generates a new, random nonce for each message to be encrypted. Use *this* function to retrieve that nonce, so that it can be passed to `SlunkCryptDecr` for decryption later.
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@ -497,6 +527,7 @@ Create and initialize a new **``SlunkCryptDecr``** instance.
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);
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***Parameters:***
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* `nonce`
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The *nonce* (number used once) to be used for the decryption process. The purpose of the nonce is to ensure that each message will be encrypted differently, even when the same password is used to encrypt *multiple* (possibly identical) messages. Therefore, a new *random* nonce **must** be chosen for each message! It is *not* necessary to keep the nonce confidential, but the same nonce **must** be used for both, encryption *and* decryption. Typically, the nonce is stored/transmitted alongside the ciphertext.
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@ -508,6 +539,7 @@ Create and initialize a new **``SlunkCryptDecr``** instance.
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*Note:* In order to thwart *brute force* attacks, it is recommended to choose a "random" password that is at least 12 characters in length and that consists of upper-case characters, lower-case characters, digits as well as other "special" characters.
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***Exceptions:***
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* Throws `std::runtime_error`, if the SlunkCrypt context could not be allocated.
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#### SlunkCryptDecr::decrypt() [1]
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@ -536,6 +568,7 @@ Decrypt the next message chunk, using separate input/output buffers.
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The length of the ciphertext chunk contained in the *input* buffer given by the `input` parameter, in bytes. At the same time, this determines the minimum required size of the *output* buffer given by the `output` parameters, in bytes.
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***Return value:***
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* If successful, `true` is returned; otherwise `false` is returned.
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#### SlunkCryptDecr::decrypt() [2]
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@ -558,6 +591,7 @@ Decrypt the next message chunk, using separate input/output containers (`std::ve
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The `output.size()` must be *greater than or equal* to `input.size()`. If the `output.size()` is greater than the `input.size()`, then only the first `input.size()` elements of `output` will be filled with decrypted data!
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***Return value:***
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* If successful, `true` is returned; otherwise `false` is returned. The function fails, if the *output* `std::vector` is too small.
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#### SlunkCryptDecr::decrypt_inplace() [1]
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@ -570,6 +604,7 @@ Decrypt the next message chunk, using a single buffer.
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);
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***Parameters:***
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* `buffer`
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A pointer to the buffer initially containing the next chunk of the ciphertext to be decrypted. The ciphertext is given as a byte array (`uint8_t`). The plaintext that corresponds to the given ciphertext will be stored to the *same* buffer, replacing the plaintext data.
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@ -579,6 +614,7 @@ Decrypt the next message chunk, using a single buffer.
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The length of the ciphertext chunk initially contained in the input/output buffer given by the `buffer` parameter, in bytes. At the same time, this determines the portion of the input/output buffer that will be overwritten with decrypted data, in bytes.
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***Return value:***
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* If successful, `true` is returned; otherwise `false` is returned.
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#### SlunkCryptDecr::decrypt_inplace() [2]
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@ -590,16 +626,19 @@ Decrypt the next message chunk, using a single container (`std::vector`).
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);
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***Parameters:***
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* `buffer`
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A reference to the `std::vector<uint8_t>` initially containing the next chunk of the ciphertext to be decrypted. The plaintext that corresponds to the given ciphertext will be stored to the *same* `std::vector<uint8_t>`, replacing all the ciphertext data.
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***Return value:***
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||||
|
||||
* If successful, `true` is returned; otherwise `false` is returned.
|
||||
|
||||
Thread safety
|
||||
-------------
|
||||
|
||||
The following functions are fully "thread-safe" and thus may safely be called by *any* thread at *any* time ***without*** the need for synchronization:
|
||||
|
||||
* `slunkcrypt_alloc()`
|
||||
* `slunkcrypt_random_bytes()`
|
||||
* `slunkcrypt_bzero()`
|
||||
@ -607,6 +646,7 @@ The following functions are fully "thread-safe" and thus may safely be called by
|
||||
* `SlunkCryptDecr::SlunkCryptDecr()`
|
||||
|
||||
The following functions are "reentrant" and thus may safely be called by *any* thread at *any* time, ***without*** the need for synchronization, provided that each `slunkcrypt_t`, `SlunkCryptEncr` or `SlunkCryptDecr` instance is "owned" (i.e. accessed *exclusively*) and by a *single* thread:
|
||||
|
||||
* `slunkcrypt_reset()`
|
||||
* `slunkcrypt_free()`
|
||||
* `slunkcrypt_encrypt()`
|
||||
|
||||
801
etc/style/gh-pandoc.css
Normal file
801
etc/style/gh-pandoc.css
Normal file
@ -0,0 +1,801 @@
|
||||
/*! normalize.css v3.0.1 | MIT License | git.io/normalize */
|
||||
|
||||
/**
|
||||
* 1. Set default font family to sans-serif.
|
||||
* 2. Prevent iOS text size adjust after orientation change, without disabling
|
||||
* user zoom.
|
||||
*/
|
||||
|
||||
html {
|
||||
font-family: sans-serif; /* 1 */
|
||||
-ms-text-size-adjust: 100%; /* 2 */
|
||||
-webkit-text-size-adjust: 100%; /* 2 */
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove default margin.
|
||||
*/
|
||||
|
||||
body {
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
/* HTML5 display definitions
|
||||
========================================================================== */
|
||||
|
||||
/**
|
||||
* Correct `block` display not defined for any HTML5 element in IE 8/9.
|
||||
* Correct `block` display not defined for `details` or `summary` in IE 10/11 and Firefox.
|
||||
* Correct `block` display not defined for `main` in IE 11.
|
||||
*/
|
||||
|
||||
article,
|
||||
aside,
|
||||
details,
|
||||
figcaption,
|
||||
figure,
|
||||
footer,
|
||||
header,
|
||||
hgroup,
|
||||
main,
|
||||
nav,
|
||||
section,
|
||||
summary {
|
||||
display: block;
|
||||
}
|
||||
|
||||
/**
|
||||
* 1. Correct `inline-block` display not defined in IE 8/9.
|
||||
* 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
|
||||
*/
|
||||
|
||||
audio,
|
||||
canvas,
|
||||
progress,
|
||||
video {
|
||||
display: inline-block; /* 1 */
|
||||
vertical-align: baseline; /* 2 */
|
||||
}
|
||||
|
||||
/**
|
||||
* Prevent modern browsers from displaying `audio` without controls.
|
||||
* Remove excess height in iOS 5 devices.
|
||||
*/
|
||||
|
||||
audio:not([controls]) {
|
||||
display: none;
|
||||
height: 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address `[hidden]` styling not present in IE 8/9/10.
|
||||
* Hide the `template` element in IE 8/9/11, Safari, and Firefox < 22.
|
||||
*/
|
||||
|
||||
[hidden],
|
||||
template {
|
||||
display: none;
|
||||
}
|
||||
|
||||
/* Links
|
||||
========================================================================== */
|
||||
|
||||
/**
|
||||
* Remove the gray background color from active links in IE 10.
|
||||
*/
|
||||
|
||||
a {
|
||||
background: transparent;
|
||||
}
|
||||
|
||||
/**
|
||||
* Improve readability when focused and also mouse hovered in all browsers.
|
||||
*/
|
||||
|
||||
a:active,
|
||||
a:hover {
|
||||
outline: 0;
|
||||
}
|
||||
|
||||
/* Text-level semantics
|
||||
========================================================================== */
|
||||
|
||||
/**
|
||||
* Address styling not present in IE 8/9/10/11, Safari, and Chrome.
|
||||
*/
|
||||
|
||||
abbr[title] {
|
||||
border-bottom: 1px dotted;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address style set to `bolder` in Firefox 4+, Safari, and Chrome.
|
||||
*/
|
||||
|
||||
b,
|
||||
strong {
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address styling not present in Safari and Chrome.
|
||||
*/
|
||||
|
||||
dfn {
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address variable `h1` font-size and margin within `section` and `article`
|
||||
* contexts in Firefox 4+, Safari, and Chrome.
|
||||
*/
|
||||
|
||||
h1 {
|
||||
font-size: 2em;
|
||||
margin: 0.67em 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address styling not present in IE 8/9.
|
||||
*/
|
||||
|
||||
mark {
|
||||
background: #ff0;
|
||||
color: #000;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address inconsistent and variable font size in all browsers.
|
||||
*/
|
||||
|
||||
small {
|
||||
font-size: 80%;
|
||||
}
|
||||
|
||||
/**
|
||||
* Prevent `sub` and `sup` affecting `line-height` in all browsers.
|
||||
*/
|
||||
|
||||
sub,
|
||||
sup {
|
||||
font-size: 75%;
|
||||
line-height: 0;
|
||||
position: relative;
|
||||
vertical-align: baseline;
|
||||
}
|
||||
|
||||
sup {
|
||||
top: -0.5em;
|
||||
}
|
||||
|
||||
sub {
|
||||
bottom: -0.25em;
|
||||
}
|
||||
|
||||
/* Embedded content
|
||||
========================================================================== */
|
||||
|
||||
/**
|
||||
* Remove border when inside `a` element in IE 8/9/10.
|
||||
*/
|
||||
|
||||
img {
|
||||
border: 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Correct overflow not hidden in IE 9/10/11.
|
||||
*/
|
||||
|
||||
svg:not(:root) {
|
||||
overflow: hidden;
|
||||
}
|
||||
|
||||
/* Grouping content
|
||||
========================================================================== */
|
||||
|
||||
/**
|
||||
* Address margin not present in IE 8/9 and Safari.
|
||||
*/
|
||||
|
||||
figure {
|
||||
margin: 1em 40px;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address differences between Firefox and other browsers.
|
||||
*/
|
||||
|
||||
hr {
|
||||
-moz-box-sizing: content-box;
|
||||
box-sizing: content-box;
|
||||
height: 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Contain overflow in all browsers.
|
||||
*/
|
||||
|
||||
pre {
|
||||
overflow: auto;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address odd `em`-unit font size rendering in all browsers.
|
||||
*/
|
||||
|
||||
code,
|
||||
kbd,
|
||||
pre,
|
||||
samp {
|
||||
font-family: monospace, monospace;
|
||||
font-size: 1em;
|
||||
}
|
||||
|
||||
/* Forms
|
||||
========================================================================== */
|
||||
|
||||
/**
|
||||
* Known limitation: by default, Chrome and Safari on OS X allow very limited
|
||||
* styling of `select`, unless a `border` property is set.
|
||||
*/
|
||||
|
||||
/**
|
||||
* 1. Correct color not being inherited.
|
||||
* Known issue: affects color of disabled elements.
|
||||
* 2. Correct font properties not being inherited.
|
||||
* 3. Address margins set differently in Firefox 4+, Safari, and Chrome.
|
||||
*/
|
||||
|
||||
button,
|
||||
input,
|
||||
optgroup,
|
||||
select,
|
||||
textarea {
|
||||
color: inherit; /* 1 */
|
||||
font: inherit; /* 2 */
|
||||
margin: 0; /* 3 */
|
||||
}
|
||||
|
||||
/**
|
||||
* Address `overflow` set to `hidden` in IE 8/9/10/11.
|
||||
*/
|
||||
|
||||
button {
|
||||
overflow: visible;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address inconsistent `text-transform` inheritance for `button` and `select`.
|
||||
* All other form control elements do not inherit `text-transform` values.
|
||||
* Correct `button` style inheritance in Firefox, IE 8/9/10/11, and Opera.
|
||||
* Correct `select` style inheritance in Firefox.
|
||||
*/
|
||||
|
||||
button,
|
||||
select {
|
||||
text-transform: none;
|
||||
}
|
||||
|
||||
/**
|
||||
* 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
|
||||
* and `video` controls.
|
||||
* 2. Correct inability to style clickable `input` types in iOS.
|
||||
* 3. Improve usability and consistency of cursor style between image-type
|
||||
* `input` and others.
|
||||
*/
|
||||
|
||||
button,
|
||||
html input[type="button"], /* 1 */
|
||||
input[type="reset"],
|
||||
input[type="submit"] {
|
||||
-webkit-appearance: button; /* 2 */
|
||||
cursor: pointer; /* 3 */
|
||||
}
|
||||
|
||||
/**
|
||||
* Re-set default cursor for disabled elements.
|
||||
*/
|
||||
|
||||
button[disabled],
|
||||
html input[disabled] {
|
||||
cursor: default;
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove inner padding and border in Firefox 4+.
|
||||
*/
|
||||
|
||||
button::-moz-focus-inner,
|
||||
input::-moz-focus-inner {
|
||||
border: 0;
|
||||
padding: 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Address Firefox 4+ setting `line-height` on `input` using `!important` in
|
||||
* the UA stylesheet.
|
||||
*/
|
||||
|
||||
input {
|
||||
line-height: normal;
|
||||
}
|
||||
|
||||
/**
|
||||
* It's recommended that you don't attempt to style these elements.
|
||||
* Firefox's implementation doesn't respect box-sizing, padding, or width.
|
||||
*
|
||||
* 1. Address box sizing set to `content-box` in IE 8/9/10.
|
||||
* 2. Remove excess padding in IE 8/9/10.
|
||||
*/
|
||||
|
||||
input[type="checkbox"],
|
||||
input[type="radio"] {
|
||||
box-sizing: border-box; /* 1 */
|
||||
padding: 0; /* 2 */
|
||||
}
|
||||
|
||||
/**
|
||||
* Fix the cursor style for Chrome's increment/decrement buttons. For certain
|
||||
* `font-size` values of the `input`, it causes the cursor style of the
|
||||
* decrement button to change from `default` to `text`.
|
||||
*/
|
||||
|
||||
input[type="number"]::-webkit-inner-spin-button,
|
||||
input[type="number"]::-webkit-outer-spin-button {
|
||||
height: auto;
|
||||
}
|
||||
|
||||
/**
|
||||
* 1. Address `appearance` set to `searchfield` in Safari and Chrome.
|
||||
* 2. Address `box-sizing` set to `border-box` in Safari and Chrome
|
||||
* (include `-moz` to future-proof).
|
||||
*/
|
||||
|
||||
input[type="search"] {
|
||||
-webkit-appearance: textfield; /* 1 */
|
||||
-moz-box-sizing: content-box;
|
||||
-webkit-box-sizing: content-box; /* 2 */
|
||||
box-sizing: content-box;
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove inner padding and search cancel button in Safari and Chrome on OS X.
|
||||
* Safari (but not Chrome) clips the cancel button when the search input has
|
||||
* padding (and `textfield` appearance).
|
||||
*/
|
||||
|
||||
input[type="search"]::-webkit-search-cancel-button,
|
||||
input[type="search"]::-webkit-search-decoration {
|
||||
-webkit-appearance: none;
|
||||
}
|
||||
|
||||
/**
|
||||
* Define consistent border, margin, and padding.
|
||||
*/
|
||||
|
||||
fieldset {
|
||||
border: 1px solid #c0c0c0;
|
||||
margin: 0 2px;
|
||||
padding: 0.35em 0.625em 0.75em;
|
||||
}
|
||||
|
||||
/**
|
||||
* 1. Correct `color` not being inherited in IE 8/9/10/11.
|
||||
* 2. Remove padding so people aren't caught out if they zero out fieldsets.
|
||||
*/
|
||||
|
||||
legend {
|
||||
border: 0; /* 1 */
|
||||
padding: 0; /* 2 */
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove default vertical scrollbar in IE 8/9/10/11.
|
||||
*/
|
||||
|
||||
textarea {
|
||||
overflow: auto;
|
||||
}
|
||||
|
||||
/**
|
||||
* Don't inherit the `font-weight` (applied by a rule above).
|
||||
* NOTE: the default cannot safely be changed in Chrome and Safari on OS X.
|
||||
*/
|
||||
|
||||
optgroup {
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
/* Tables
|
||||
========================================================================== */
|
||||
|
||||
/**
|
||||
* Remove most spacing between table cells.
|
||||
*/
|
||||
|
||||
table {
|
||||
border-collapse: collapse;
|
||||
border-spacing: 0;
|
||||
}
|
||||
|
||||
td,
|
||||
th {
|
||||
padding: 0;
|
||||
}
|
||||
|
||||
/* Figure captions */
|
||||
|
||||
.caption {
|
||||
margin-bottom: 5em;
|
||||
}
|
||||
|
||||
/*! End of normalize.css
|
||||
========================================================================== */
|
||||
|
||||
/* Github styles
|
||||
========================================================================== */
|
||||
|
||||
* {
|
||||
box-sizing: border-box;
|
||||
}
|
||||
body {
|
||||
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
|
||||
font-size: 10pt;
|
||||
line-height: 1.6;
|
||||
margin: auto;
|
||||
max-width: 1184px;
|
||||
min-width: 360px;
|
||||
padding: 2rem;
|
||||
word-wrap: break-word;
|
||||
}
|
||||
|
||||
/* Headers
|
||||
========================================================================== */
|
||||
|
||||
h1, h2, h3, h4, h5, h6 {
|
||||
font-weight: 600;
|
||||
line-height: 1.25;
|
||||
margin-bottom: 16px;
|
||||
margin-top: 24px;
|
||||
}
|
||||
h1 {
|
||||
padding-bottom: 0.3em;
|
||||
font-size: 2em;
|
||||
border-bottom: 1px solid #eee;
|
||||
}
|
||||
h2 {
|
||||
padding-bottom: 0.3em;
|
||||
font-size: 1.5em;
|
||||
border-bottom: 1px solid #eee;
|
||||
}
|
||||
h3 {
|
||||
font-size: 1.25em;;
|
||||
}
|
||||
h4 {
|
||||
font-size: 1em;
|
||||
}
|
||||
h5 {
|
||||
font-size: 0.875em;
|
||||
}
|
||||
h6 {
|
||||
font-size: 0.85em;
|
||||
color: #777;
|
||||
}
|
||||
h1 tt, h1 code,
|
||||
h2 tt, h2 code,
|
||||
h3 tt, h3 code,
|
||||
h4 tt, h4 code,
|
||||
h5 tt, h5 code,
|
||||
h6 tt, h6 code {
|
||||
font-size: inherit;
|
||||
}
|
||||
body > h2:first-child {
|
||||
margin-top: 0;
|
||||
padding-top: 0;
|
||||
}
|
||||
body > h1:first-child {
|
||||
margin-top: 0;
|
||||
padding-top: 0;
|
||||
}
|
||||
body > h1:first-child+h2 {
|
||||
margin-top: 0;
|
||||
padding-top: 0;
|
||||
}
|
||||
body > h3:first-child,
|
||||
body > h4:first-child,
|
||||
body > h5:first-child,
|
||||
body > h6:first-child {
|
||||
margin-top: 0;
|
||||
padding-top: 0;
|
||||
}
|
||||
a:first-child h1,
|
||||
a:first-child h2,
|
||||
a:first-child h3,
|
||||
a:first-child h4,
|
||||
a:first-child h5,
|
||||
a:first-child h6 {
|
||||
margin-top: 0;
|
||||
padding-top: 0;
|
||||
}
|
||||
|
||||
/* Flow Content
|
||||
========================================================================== */
|
||||
|
||||
a {
|
||||
color: #4078c0;
|
||||
text-decoration: none;
|
||||
}
|
||||
a:active, a:hover {
|
||||
outline: 0;
|
||||
text-decoration: underline;
|
||||
}
|
||||
sup, sub, a.footnote {
|
||||
font-size: 75%;
|
||||
line-height: 0;
|
||||
position: relative;
|
||||
vertical-align: baseline;
|
||||
}
|
||||
sub {
|
||||
bottom: -0.25em;
|
||||
}
|
||||
sup {
|
||||
top: -0.5em;
|
||||
}
|
||||
|
||||
/* Block Content
|
||||
========================================================================== */
|
||||
|
||||
ol, ul {
|
||||
margin-bottom: 16px;
|
||||
margin-top: 0;
|
||||
padding-left: 2em;
|
||||
}
|
||||
p, blockquote, table, pre {
|
||||
margin: 15px 0;
|
||||
}
|
||||
ul, ol {
|
||||
padding-left: 2em;
|
||||
}
|
||||
ul.no-list, ol.no-list {
|
||||
padding: 0;
|
||||
list-style-type: none;
|
||||
}
|
||||
ul ul, ul ol, ol ol, ol ul {
|
||||
margin-top: 0;
|
||||
margin-bottom: 0;
|
||||
}
|
||||
li > p {
|
||||
margin-top: 16px;
|
||||
}
|
||||
li + li {
|
||||
margin-top: 0.25em;;
|
||||
}
|
||||
ol li ul:first-of-type {
|
||||
margin-top: 0;
|
||||
}
|
||||
hr {
|
||||
background: transparent url(data:image/png;base64,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) repeat-x 0 0;
|
||||
border: 0 none;
|
||||
color: #ccc;
|
||||
height: 4px;
|
||||
margin: 16px 0;
|
||||
padding: 0;
|
||||
}
|
||||
h1 + p,
|
||||
h2 + p,
|
||||
h3 + p,
|
||||
h4 + p,
|
||||
h5 + p,
|
||||
h6 + p,
|
||||
ul li > :first-child,
|
||||
ol li > :first-child {
|
||||
margin-top: 0;
|
||||
}
|
||||
dl {
|
||||
padding: 0;
|
||||
}
|
||||
dl dt {
|
||||
font-size: 1em;
|
||||
font-weight: bold;
|
||||
font-style: italic;
|
||||
padding: 0;
|
||||
margin: 15px 0 5px;
|
||||
}
|
||||
dl dt:first-child {
|
||||
padding: 0;
|
||||
}
|
||||
dl dt > :first-child {
|
||||
margin-top: 0;
|
||||
}
|
||||
dl dt > :last-child {
|
||||
margin-bottom: 0;
|
||||
}
|
||||
dl dd {
|
||||
margin: 0 0 15px;
|
||||
padding: 0 15px;
|
||||
}
|
||||
dl dd > :first-child {
|
||||
margin-top: 0;
|
||||
}
|
||||
dl dd > :last-child {
|
||||
margin-bottom: 0;
|
||||
}
|
||||
blockquote {
|
||||
border-left: 4px solid #DDD;
|
||||
padding: 0 15px;
|
||||
color: #777;
|
||||
}
|
||||
blockquote > :first-child {
|
||||
margin-top: 0;
|
||||
}
|
||||
blockquote > :last-child {
|
||||
margin-bottom: 0;
|
||||
}
|
||||
table {
|
||||
border-collapse: collapse;
|
||||
border-spacing: 0;
|
||||
font-size: 100%;
|
||||
font: inherit;
|
||||
}
|
||||
table th {
|
||||
font-weight: bold;
|
||||
border: 1px solid #ccc;
|
||||
padding: 6px 13px;
|
||||
}
|
||||
table td {
|
||||
border: 1px solid #ccc;
|
||||
padding: 6px 13px;
|
||||
}
|
||||
table td > p:first-child {
|
||||
margin-top: 0;
|
||||
}
|
||||
table td > p:last-child {
|
||||
margin-bottom: 0;
|
||||
}
|
||||
table tr {
|
||||
border-top: 1px solid #ccc;
|
||||
background-color: #fff;
|
||||
}
|
||||
table tr:nth-child(2n) {
|
||||
background-color: #f8f8f8;
|
||||
}
|
||||
img {
|
||||
max-width: 100%;
|
||||
}
|
||||
|
||||
/* Code
|
||||
========================================================================== */
|
||||
|
||||
code, tt {
|
||||
padding: 0;
|
||||
padding-top: 0.2em;
|
||||
padding-bottom: 0.2em;
|
||||
margin: 0;
|
||||
font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace;
|
||||
font-size: 10pt;
|
||||
background-color: rgba(0, 0, 0, 0.04);
|
||||
border-radius: 3px;
|
||||
}
|
||||
pre > code {
|
||||
margin: 0;
|
||||
padding: 0;
|
||||
white-space: pre;
|
||||
border: 0;
|
||||
background: transparent;
|
||||
}
|
||||
pre {
|
||||
padding: 16px;
|
||||
margin-top: 0;
|
||||
margin-bottom: 0;
|
||||
background-color: #f8f8f8;
|
||||
font-size: 10pt;
|
||||
line-height: 19px;
|
||||
overflow: auto;
|
||||
border-radius: 3px;
|
||||
}
|
||||
pre code, pre tt {
|
||||
background-color: transparent;
|
||||
border: 0;
|
||||
}
|
||||
code::before, code::after,
|
||||
tt::before, tt::after {
|
||||
letter-spacing: -0.2em;
|
||||
content: "\00a0";
|
||||
}
|
||||
pre code::before, pre code::after, pre tt::before, pre tt::after {
|
||||
content: normal;
|
||||
}
|
||||
code > span.kw { color: #a71d5d; font-weight: normal; } /* Keyword */
|
||||
code > span.dt { color: inherit; } /* DataType */
|
||||
code > span.dv { color: #0086b3; } /* DecVal */
|
||||
code > span.bn { color: #0086b3; } /* BaseN */
|
||||
code > span.fl { color: #0086b3; } /* Float */
|
||||
code > span.ch { color: #183691; } /* Char */
|
||||
code > span.st { color: #183691; } /* String */
|
||||
code > span.co { color: #969896; font-style: normal; } /* Comment */
|
||||
code > span.ot { color: #a71d5d; } /* Other */
|
||||
code > span.al { color: #ff0000; } /* Alert */
|
||||
code > span.fu { color: #795da3; } /* Function */
|
||||
code > span.er { color: #ff0000; font-weight: bold; } /* Error */
|
||||
code > span.wa { color: #969896; font-weight: bold; font-style: italic; } /* Warning */
|
||||
code > span.cn { color: #880000; } /* Constant */
|
||||
code > span.sc { color: #183691; } /* SpecialChar */
|
||||
code > span.vs { color: #183691; } /* VerbatimString */
|
||||
code > span.ss { color: #bb6688; } /* SpecialString */
|
||||
code > span.im { } /* Import */
|
||||
code > span.va { color: #19177c; } /* Variable */
|
||||
code > span.cf { color: #a71d5d; font-weight: normal; } /* ControlFlow */
|
||||
code > span.op { color: #666666; } /* Operator */
|
||||
code > span.bu { } /* BuiltIn */
|
||||
code > span.ex { } /* Extension */
|
||||
code > span.pp { color: #bc7a00; } /* Preprocessor */
|
||||
code > span.at { color: #0086b3; } /* Attribute */
|
||||
code > span.do { color: #ba2121; font-style: italic; } /* Documentation */
|
||||
code > span.an { color: #969896; font-weight: bold; font-style: italic; } /* Annotation */
|
||||
code > span.cv { color: #969896; font-weight: bold; font-style: italic; } /* CommentVar */
|
||||
code > span.in { color: #969896; font-weight: bold; font-style: italic; } /* Information */
|
||||
|
||||
/* Print
|
||||
========================================================================== */
|
||||
|
||||
@media print {
|
||||
body {
|
||||
background: #fff;
|
||||
}
|
||||
img, pre, blockquote, table, figure {
|
||||
page-break-inside: avoid;
|
||||
}
|
||||
body {
|
||||
background: #fff;
|
||||
border: 0;
|
||||
}
|
||||
code {
|
||||
background-color: #fff;
|
||||
color: #333!important;
|
||||
padding: 0 .2em;
|
||||
border: 1px solid #dedede;
|
||||
}
|
||||
pre {
|
||||
background: #fff;
|
||||
}
|
||||
pre code {
|
||||
background-color: white!important;
|
||||
overflow: visible;
|
||||
}
|
||||
}
|
||||
|
||||
/* Selection
|
||||
========================================================================== */
|
||||
|
||||
@media screen {
|
||||
::selection {
|
||||
background: rgba(157, 193, 200, 0.5);
|
||||
}
|
||||
h1::selection {
|
||||
background-color: rgba(45, 156, 208, 0.3);
|
||||
}
|
||||
h2::selection {
|
||||
background-color: rgba(90, 182, 224, 0.3);
|
||||
}
|
||||
h3::selection, h4::selection, h5::selection, h6::selection, li::selection, ol::selection {
|
||||
background-color: rgba(133, 201, 232, 0.3);
|
||||
}
|
||||
code::selection {
|
||||
background-color: rgba(0, 0, 0, 0.7);
|
||||
color: #eee;
|
||||
}
|
||||
code span::selection {
|
||||
background-color: rgba(0, 0, 0, 0.7)!important;
|
||||
color: #eee!important;
|
||||
}
|
||||
a::selection {
|
||||
background-color: rgba(255, 230, 102, 0.2);
|
||||
}
|
||||
.inverted a::selection {
|
||||
background-color: rgba(255, 230, 102, 0.6);
|
||||
}
|
||||
td::selection, th::selection, caption::selection {
|
||||
background-color: rgba(180, 237, 95, 0.5);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user