63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
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/******************************************************************************/
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/* MCrypt, by LoRd_MuldeR <MuldeR2@GMX.de> */
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/* This work has been released under the CC0 1.0 Universal license! */
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/******************************************************************************/
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#ifdef _WIN32
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#define _CRT_RAND_S 1
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#endif
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#include "utils.h"
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int mcrypt_random_bytes(uint8_t* const buffer, const size_t length)
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{
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#ifdef _WIN32
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size_t pos = 0U;
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while (pos < length)
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{
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const size_t bytes_left = length - pos;
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const size_t bytes_copy = (bytes_left < sizeof(uint32_t)) ? bytes_left : sizeof(uint32_t);
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uint32_t temp;
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if (rand_s(&temp) != 0)
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{
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return -1;
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}
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for (size_t i = 0; i < bytes_copy; ++i)
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{
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buffer[pos++] = (uint8_t)(temp & 0xFF);
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temp >>= 8;
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}
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}
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return 0;
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#else
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#ifdef __unix__
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static const char* const PATH[] = { "/dev/urandom", "/dev/random" };
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int result = -1;
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for (size_t i = 0; (i < 2U) && (result < 0); ++i)
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{
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const int fd = open(PATH[i], O_RDONLY);
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if (fd >= 0)
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{
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if (read(fd, buffer, length) < length)
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{
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result = 0;
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}
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close(fd);
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}
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}
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return result;
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#else
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#error Unsupported target platform!
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#endif
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#endif
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}
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void mcrypt_erase(void* const ptr, const size_t length)
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{
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volatile uint8_t* buffer = ptr;
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for (size_t i = 0U; i < length; ++i)
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{
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buffer[i] = 0U;
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}
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}
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