diff options
Diffstat (limited to 'libtomcrypt/src/prngs/rng_get_bytes.c')
| -rw-r--r-- | libtomcrypt/src/prngs/rng_get_bytes.c | 85 |
1 files changed, 48 insertions, 37 deletions
diff --git a/libtomcrypt/src/prngs/rng_get_bytes.c b/libtomcrypt/src/prngs/rng_get_bytes.c index b8cc6f5..4e9a063 100644 --- a/libtomcrypt/src/prngs/rng_get_bytes.c +++ b/libtomcrypt/src/prngs/rng_get_bytes.c @@ -5,42 +5,45 @@ * * The library is free for all purposes without any express * guarantee it works. - * - * Tom St Denis, tomstdenis@gmail.com, http://libtom.org */ #include "tomcrypt.h" -/** +#ifdef LTC_RNG_GET_BYTES +/** @file rng_get_bytes.c portable way to get secure random bits to feed a PRNG (Tom St Denis) */ -#ifdef LTC_DEVRANDOM +#if defined(LTC_DEVRANDOM) && !defined(_WIN32) /* on *NIX read /dev/random */ -static unsigned long rng_nix(unsigned char *buf, unsigned long len, +static unsigned long _rng_nix(unsigned char *buf, unsigned long len, void (*callback)(void)) { #ifdef LTC_NO_FILE + LTC_UNUSED_PARAM(callback); + LTC_UNUSED_PARAM(buf); + LTC_UNUSED_PARAM(len); return 0; #else FILE *f; unsigned long x; -#ifdef TRY_URANDOM_FIRST + LTC_UNUSED_PARAM(callback); +#ifdef LTC_TRY_URANDOM_FIRST f = fopen("/dev/urandom", "rb"); if (f == NULL) -#endif /* TRY_URANDOM_FIRST */ +#endif /* LTC_TRY_URANDOM_FIRST */ f = fopen("/dev/random", "rb"); if (f == NULL) { return 0; } - + /* disable buffering */ if (setvbuf(f, NULL, _IONBF, 0) != 0) { fclose(f); return 0; - } - + } + x = (unsigned long)fread(buf, 1, (size_t)len, f); fclose(f); return x; @@ -49,21 +52,16 @@ static unsigned long rng_nix(unsigned char *buf, unsigned long len, #endif /* LTC_DEVRANDOM */ -/* on ANSI C platforms with 100 < CLOCKS_PER_SEC < 10000 */ -#if defined(CLOCKS_PER_SEC) && !defined(WINCE) +#if !defined(_WIN32_WCE) #define ANSI_RNG -static unsigned long rng_ansic(unsigned char *buf, unsigned long len, +static unsigned long _rng_ansic(unsigned char *buf, unsigned long len, void (*callback)(void)) { clock_t t1; int l, acc, bits, a, b; - if (XCLOCKS_PER_SEC < 100 || XCLOCKS_PER_SEC > 10000) { - return 0; - } - l = len; bits = 8; acc = a = b = 0; @@ -76,33 +74,37 @@ static unsigned long rng_ansic(unsigned char *buf, unsigned long len, } while (a == b); acc = (acc << 1) | a; } - *buf++ = acc; + *buf++ = acc; acc = 0; bits = 8; } - acc = bits = a = b = 0; return l; } -#endif +#endif /* Try the Microsoft CSP */ -#if defined(WIN32) || defined(WINCE) -#define _WIN32_WINNT 0x0400 -#ifdef WINCE +#if defined(_WIN32) || defined(_WIN32_WCE) +#ifndef _WIN32_WINNT + #define _WIN32_WINNT 0x0400 +#endif +#ifdef _WIN32_WCE #define UNDER_CE #define ARM #endif + +#define WIN32_LEAN_AND_MEAN #include <windows.h> #include <wincrypt.h> -static unsigned long rng_win32(unsigned char *buf, unsigned long len, +static unsigned long _rng_win32(unsigned char *buf, unsigned long len, void (*callback)(void)) { HCRYPTPROV hProv = 0; - if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, - (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) && - !CryptAcquireContext (&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, + LTC_UNUSED_PARAM(callback); + if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, + (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) && + !CryptAcquireContext (&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET)) return 0; @@ -123,26 +125,35 @@ static unsigned long rng_win32(unsigned char *buf, unsigned long len, @param outlen Length desired (octets) @param callback Pointer to void function to act as "callback" when RNG is slow. This can be NULL @return Number of octets read -*/ -unsigned long rng_get_bytes(unsigned char *out, unsigned long outlen, +*/ +unsigned long rng_get_bytes(unsigned char *out, unsigned long outlen, void (*callback)(void)) { unsigned long x; LTC_ARGCHK(out != NULL); -#if defined(LTC_DEVRANDOM) - x = rng_nix(out, outlen, callback); if (x != 0) { return x; } +#ifdef LTC_PRNG_ENABLE_LTC_RNG + if (ltc_rng) { + x = ltc_rng(out, outlen, callback); + if (x != 0) { + return x; + } + } #endif -#ifdef WIN32 - x = rng_win32(out, outlen, callback); if (x != 0) { return x; } + +#if defined(_WIN32) || defined(_WIN32_WCE) + x = _rng_win32(out, outlen, callback); if (x != 0) { return x; } +#elif defined(LTC_DEVRANDOM) + x = _rng_nix(out, outlen, callback); if (x != 0) { return x; } #endif #ifdef ANSI_RNG - x = rng_ansic(out, outlen, callback); if (x != 0) { return x; } + x = _rng_ansic(out, outlen, callback); if (x != 0) { return x; } #endif return 0; } +#endif /* #ifdef LTC_RNG_GET_BYTES */ -/* $Source$ */ -/* $Revision$ */ -/* $Date$ */ +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */ |