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