From bd7d151abf2c51e24a0dc60f7400c0388904c9f1 Mon Sep 17 00:00:00 2001 From: Mounir IDRASSI Date: Tue, 14 Oct 2014 17:02:37 +0200 Subject: Add SHA-256 source specific for upcoming bootloader build because of its small size. It was derived from the libtomcrypt public domain source. --- src/Crypto/Sha2Small.c | 246 +++++++++++++++++++++++++++++++++++++++++++++++++ src/Crypto/Sha2Small.h | 55 +++++++++++ 2 files changed, 301 insertions(+) create mode 100644 src/Crypto/Sha2Small.c create mode 100644 src/Crypto/Sha2Small.h (limited to 'src') diff --git a/src/Crypto/Sha2Small.c b/src/Crypto/Sha2Small.c new file mode 100644 index 00000000..9acd1b83 --- /dev/null +++ b/src/Crypto/Sha2Small.c @@ -0,0 +1,246 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtom.org + * + */ + +/* Adapted for VeraCrypt */ + +#include +#include "Common/Tcdefs.h" +#include "Common/Endian.h" +#include "Sha2Small.h" + +#pragma optimize ("tl", on) + +typedef unsigned __int32 uint32; +typedef unsigned __int8 byte; + +#include +#pragma intrinsic(_lrotr) +#define RORc(x,n) _lrotr(x,n) + +/******************************************************************************/ + +/* + The K array + */ + +static const uint32 K[64] = { + 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL, + 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL, + 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, + 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL, + 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL, + 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL, + 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, + 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL, + 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL, + 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL, + 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, + 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL, + 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL +}; + +/* + Various logical functions + */ +#define Ch(x,y,z) (z ^ (x & (y ^ z))) +#define Maj(x,y,z) (((x | y) & z) | (x & y)) +#define S(x, n) RORc((x),(n)) +#define R(x, n) ((x)>>(n)) +#define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22)) +#define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25)) +#define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3)) +#define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10)) + +#define STORE32H(x, y, i) { \ +(y)[i] = (unsigned char)(((x)>>24)); \ +(y)[i+1] = (unsigned char)(((x)>>16)); \ +(y)[i+2] = (unsigned char)(((x)>>8)); \ +(y)[i+3] = (unsigned char)((x)); \ +} + +#define LOAD32H(x, y, i) { \ +x = ((unsigned long)((y)[i])<<24) | \ +((unsigned long)((y)[i+1])<<16) | \ +((unsigned long)((y)[i+2])<<8) | \ +((unsigned long)((y)[i+3])); \ +} + +/* + compress 512-bits + */ +static void sha256_compress(sha256_ctx * ctx, unsigned char *buf) +{ + + uint32 S[8], W[64], t0, t1; + uint32 t, w2, w15; + int i; + +/* + copy state into S + */ + for (i = 0; i < 8; i++) { + S[i] = ctx->state[i]; + } + +/* + copy the state into 512-bits into W[0..15] + */ + for (i = 0; i < 16; i++) { + LOAD32H(W[i], buf , (4*i)); + } + +/* + fill W[16..63] + */ + for (i = 16; i < 64; i++) { + w2 = W[i - 2]; + w15 = W[i - 15]; + W[i] = Gamma1(w2) + W[i - 7] + Gamma0(w15) + W[i - 16]; + } + +/* + Compress + */ + +#define RND(a,b,c,d,e,f,g,h,i) \ + t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \ + t1 = Sigma0(a) + Maj(a, b, c); \ + d += t0; \ + h = t0 + t1; + + for (i = 0; i < 64; ++i) { + RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i); + t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4]; + S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t; + } + +/* + feedback + */ + for (i = 0; i < 8; i++) { + ctx->state[i] += S[i]; + } + +} + +/* + init the sha256 state + */ +VOID_RETURN sha256_begin(sha256_ctx* ctx) +{ + ctx->curlen = 0; + ctx->state[0] = 0x6A09E667UL; + ctx->state[1] = 0xBB67AE85UL; + ctx->state[2] = 0x3C6EF372UL; + ctx->state[3] = 0xA54FF53AUL; + ctx->state[4] = 0x510E527FUL; + ctx->state[5] = 0x9B05688CUL; + ctx->state[6] = 0x1F83D9ABUL; + ctx->state[7] = 0x5BE0CD19UL; + ctx->highLength = 0; + ctx->lowLength = 0; +} + +VOID_RETURN sha256_hash(unsigned char* data, unsigned int len, sha256_ctx* ctx) +{ + uint32 n; + while (len > 0) { + if (ctx->curlen == 0 && len >= 64) { + sha256_compress(ctx, (unsigned char *)data); + + n = ctx->lowLength + 512; + if (n < ctx->lowLength) { + ctx->highLength++; + } + ctx->lowLength = n; + data += 64; + len -= 64; + } else { + n = min(len, 64 - ctx->curlen); + memcpy(ctx->buf + ctx->curlen, data, (size_t)n); + ctx->curlen += (unsigned int) n; + data += (unsigned int) n; + len -= (unsigned int) n; + + if (ctx->curlen == 64) { + sha256_compress (ctx, ctx->buf); + + n = ctx->lowLength + 512; + if (n < ctx->lowLength) { + ctx->highLength++; + } + ctx->lowLength = n; + ctx->curlen = 0; + } + } + } + return; +} + +VOID_RETURN sha256_end(unsigned char* hval, sha256_ctx* ctx) +{ + int i; + uint32 n; + +/* + increase the length of the message + */ + + n = ctx->lowLength + (ctx->curlen << 3); + if (n < ctx->lowLength) { + ctx->highLength++; + } + ctx->highLength += (ctx->curlen >> 29); + ctx->lowLength = n; + +/* + append the '1' bit + */ + ctx->buf[ctx->curlen++] = (unsigned char)0x80; + +/* + if the length is currently above 56 bytes we append zeros then compress. + Then we can fall back to padding zeros and length encoding like normal. + */ + if (ctx->curlen > 56) { + while (ctx->curlen < 64) { + ctx->buf[ctx->curlen++] = (unsigned char)0; + } + sha256_compress(ctx, ctx->buf); + ctx->curlen = 0; + } + +/* + pad upto 56 bytes of zeroes + */ + while (ctx->curlen < 56) { + ctx->buf[ctx->curlen++] = (unsigned char)0; + } + +/* + store length + */ + + STORE32H(ctx->highLength, ctx->buf, 56); + STORE32H(ctx->lowLength, ctx->buf, 60); + + sha256_compress(ctx, ctx->buf); + +/* + copy output + */ + for (i = 0; i < 8; i++) { + STORE32H(ctx->state[i], hval, (4*i)); + } +} + +/******************************************************************************/ diff --git a/src/Crypto/Sha2Small.h b/src/Crypto/Sha2Small.h new file mode 100644 index 00000000..2b79eaf4 --- /dev/null +++ b/src/Crypto/Sha2Small.h @@ -0,0 +1,55 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtom.org + * + */ + +/* Adapted for VeraCrypt */ + +#ifndef _SHA2_SMALL_H +#define _SHA2_SMALL_H + +#include "Common/Tcdefs.h" +#include "Common/Endian.h" + +#define SHA256_DIGEST_SIZE 32 +#define SHA256_BLOCK_SIZE 64 + +#define VOID_RETURN void +#define INT_RETURN int + +#if defined(__cplusplus) +extern "C" +{ +#endif + +typedef struct { + + uint32 highLength; + uint32 lowLength; + uint32 state[8]; + unsigned int curlen; + unsigned char buf[64]; +} sha256_ctx; + +/******************************************************************************/ + +VOID_RETURN sha256_begin(sha256_ctx* ctx); +VOID_RETURN sha256_hash(unsigned char* data, unsigned int len, sha256_ctx* ctx); +VOID_RETURN sha256_end(unsigned char* hval, sha256_ctx* ctx); + +#if defined(__cplusplus) +} +#endif + +/******************************************************************************/ + +#endif /* _h_PS_DIGEST */ +/******************************************************************************/ + -- cgit v1.2.3