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Added support for random numbers generated on WASI #34

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merged 1 commit into from Aug 27, 2021
Merged

Added support for random numbers generated on WASI #34

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14 changes: 14 additions & 0 deletions randombytes.c
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Expand Up @@ -13,6 +13,10 @@
# include <wincrypt.h> /* CryptAcquireContext, CryptGenRandom */
#endif /* defined(_WIN32) */

/* wasi */
#if defined(__wasi__)
#include <stdlib.h>
#endif

#if defined(__linux__)
/* Linux */
Expand Down Expand Up @@ -78,6 +82,12 @@ static int randombytes_win32_randombytes(void* buf, const size_t n)
}
#endif /* defined(_WIN32) */

#if defined(__wasi__)
static int randombytes_wasi_randombytes(void *buf, size_t n) {
arc4random_buf(buf, n);
return 0;
}
#endif /* defined(__wasi__) */

#if defined(__linux__) && defined(SYS_getrandom)
static int randombytes_linux_randombytes_getrandom(void *buf, size_t n)
Expand Down Expand Up @@ -302,6 +312,10 @@ int randombytes(void *buf, size_t n)
# pragma message("Using Windows cryptographic API")
/* Use windows API */
return randombytes_win32_randombytes(buf, n);
#elif defined(__wasi__)
# pragma message("Using WASI arc4random_buf system call")
/* Use WASI */
return randombytes_wasi_randombytes(buf, n);
#else
# error "randombytes(...) is not supported on this platform"
#endif
Expand Down