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Diffstat (limited to 'common/sha256.c')
| -rw-r--r--[l---------] | common/sha256.c | 297 |
1 files changed, 296 insertions, 1 deletions
diff --git a/common/sha256.c b/common/sha256.c index 8c0778c3e6..2826f6c68d 120000..100644 --- a/common/sha256.c +++ b/common/sha256.c @@ -1 +1,296 @@ -../third_party/sha2//sha256.c
\ No newline at end of file +/* SHA-256 and SHA-512 implementation based on code by Oliver Gay + * <olivier.gay@a3.epfl.ch> under a BSD-style license. See below. + */ + +/* + * FIPS 180-2 SHA-224/256/384/512 implementation + * Last update: 02/02/2007 + * Issue date: 04/30/2005 + * + * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "builtin/assert.h" +#include "sha256.h" +#include "util.h" + +#define SHFR(x, n) (x >> n) +#define ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n))) +#define ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n))) +#define CH(x, y, z) ((x & y) ^ (~x & z)) +#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z)) + +#define SHA256_F1(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22)) +#define SHA256_F2(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25)) +#define SHA256_F3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHFR(x, 3)) +#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10)) + +#define UNPACK32(x, str) \ + { \ + *((str) + 3) = (uint8_t)((x)); \ + *((str) + 2) = (uint8_t)((x) >> 8); \ + *((str) + 1) = (uint8_t)((x) >> 16); \ + *((str) + 0) = (uint8_t)((x) >> 24); \ + } + +#define PACK32(str, x) \ + { \ + *(x) = ((uint32_t) * ((str) + 3)) | \ + ((uint32_t) * ((str) + 2) << 8) | \ + ((uint32_t) * ((str) + 1) << 16) | \ + ((uint32_t) * ((str) + 0) << 24); \ + } + +/* Macros used for loops unrolling */ + +#define SHA256_SCR(i) \ + { \ + w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + \ + w[i - 16]; \ + } + +#define SHA256_EXP(a, b, c, d, e, f, g, h, j) \ + { \ + t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) + \ + sha256_k[j] + w[j]; \ + t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]); \ + wv[d] += t1; \ + wv[h] = t1 + t2; \ + } + +static const uint32_t sha256_h0[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, + 0xa54ff53a, 0x510e527f, 0x9b05688c, + 0x1f83d9ab, 0x5be0cd19 }; + +static const uint32_t sha256_k[64] = { + 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, + 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, + 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, + 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, + 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, + 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, + 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, + 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, + 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, + 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, + 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 +}; + +void SHA256_init(struct sha256_ctx *ctx) +{ + int i; + + for (i = 0; i < 8; i++) + ctx->h[i] = sha256_h0[i]; + + ctx->len = 0; + ctx->tot_len = 0; +} + +static void SHA256_transform(struct sha256_ctx *ctx, const uint8_t *message, + unsigned int block_nb) +{ + /* Note: this function requires a considerable amount of stack */ + uint32_t w[64]; + uint32_t wv[8]; + uint32_t t1, t2; + const unsigned char *sub_block; + int i, j; + + for (i = 0; i < (int)block_nb; i++) { + sub_block = message + (i << 6); + + for (j = 0; j < 16; j++) + PACK32(&sub_block[j << 2], &w[j]); + +#ifdef CONFIG_SHA256_UNROLLED + for (j = 16; j < 64; j += 8) { + SHA256_SCR(j); + SHA256_SCR(j + 1); + SHA256_SCR(j + 2); + SHA256_SCR(j + 3); + SHA256_SCR(j + 4); + SHA256_SCR(j + 5); + SHA256_SCR(j + 6); + SHA256_SCR(j + 7); + } +#else + for (j = 16; j < 64; j++) + SHA256_SCR(j); +#endif + + for (j = 0; j < 8; j++) + wv[j] = ctx->h[j]; + +#ifdef CONFIG_SHA256_UNROLLED + for (j = 0; j < 64; j += 8) { + SHA256_EXP(0, 1, 2, 3, 4, 5, 6, 7, j); + SHA256_EXP(7, 0, 1, 2, 3, 4, 5, 6, j + 1); + SHA256_EXP(6, 7, 0, 1, 2, 3, 4, 5, j + 2); + SHA256_EXP(5, 6, 7, 0, 1, 2, 3, 4, j + 3); + SHA256_EXP(4, 5, 6, 7, 0, 1, 2, 3, j + 4); + SHA256_EXP(3, 4, 5, 6, 7, 0, 1, 2, j + 5); + SHA256_EXP(2, 3, 4, 5, 6, 7, 0, 1, j + 6); + SHA256_EXP(1, 2, 3, 4, 5, 6, 7, 0, j + 7); + } +#else + for (j = 0; j < 64; j++) { + t1 = wv[7] + SHA256_F2(wv[4]) + + CH(wv[4], wv[5], wv[6]) + sha256_k[j] + w[j]; + t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]); + wv[7] = wv[6]; + wv[6] = wv[5]; + wv[5] = wv[4]; + wv[4] = wv[3] + t1; + wv[3] = wv[2]; + wv[2] = wv[1]; + wv[1] = wv[0]; + wv[0] = t1 + t2; + } +#endif + + for (j = 0; j < 8; j++) + ctx->h[j] += wv[j]; + } +} + +void SHA256_update(struct sha256_ctx *ctx, const uint8_t *data, uint32_t len) +{ + unsigned int block_nb; + unsigned int new_len, rem_len, tmp_len; + const uint8_t *shifted_data; + + tmp_len = SHA256_BLOCK_SIZE - ctx->len; + rem_len = len < tmp_len ? len : tmp_len; + + memcpy(&ctx->block[ctx->len], data, rem_len); + + if (ctx->len + len < SHA256_BLOCK_SIZE) { + ctx->len += len; + return; + } + + new_len = len - rem_len; + block_nb = new_len / SHA256_BLOCK_SIZE; + + shifted_data = data + rem_len; + + SHA256_transform(ctx, ctx->block, 1); + SHA256_transform(ctx, shifted_data, block_nb); + + rem_len = new_len % SHA256_BLOCK_SIZE; + + memcpy(ctx->block, &shifted_data[block_nb << 6], rem_len); + + ctx->len = rem_len; + ctx->tot_len += (block_nb + 1) << 6; +} + +/* + * Specialized SHA256_init + SHA256_update that takes the first data block of + * size SHA256_BLOCK_SIZE as input. + */ +static void SHA256_init_1b(struct sha256_ctx *ctx, const uint8_t *data) +{ + int i; + + for (i = 0; i < 8; i++) + ctx->h[i] = sha256_h0[i]; + + SHA256_transform(ctx, data, 1); + + ctx->len = 0; + ctx->tot_len = SHA256_BLOCK_SIZE; +} + +uint8_t *SHA256_final(struct sha256_ctx *ctx) +{ + unsigned int block_nb; + unsigned int pm_len; + unsigned int len_b; + int i; + + block_nb = (1 + + ((SHA256_BLOCK_SIZE - 9) < (ctx->len % SHA256_BLOCK_SIZE))); + + len_b = (ctx->tot_len + ctx->len) << 3; + pm_len = block_nb << 6; + + memset(ctx->block + ctx->len, 0, pm_len - ctx->len); + ctx->block[ctx->len] = 0x80; + UNPACK32(len_b, ctx->block + pm_len - 4); + + SHA256_transform(ctx, ctx->block, block_nb); + + for (i = 0; i < 8; i++) + UNPACK32(ctx->h[i], &ctx->buf[i << 2]); + + return ctx->buf; +} + +static void hmac_SHA256_step(uint8_t *output, uint8_t mask, const uint8_t *key, + const int key_len, const uint8_t *data, + const int data_len) +{ + struct sha256_ctx ctx; + uint8_t *key_pad = ctx.block; + uint8_t *tmp; + int i; + + /* key_pad = key (zero-padded) ^ mask */ + memset(key_pad, mask, SHA256_BLOCK_SIZE); + for (i = 0; i < key_len; i++) + key_pad[i] ^= key[i]; + + /* tmp = hash(key_pad || message) */ + SHA256_init_1b(&ctx, key_pad); + SHA256_update(&ctx, data, data_len); + tmp = SHA256_final(&ctx); + memcpy(output, tmp, SHA256_DIGEST_SIZE); +} + +void hmac_SHA256(uint8_t *output, const uint8_t *key, const int key_len, + const uint8_t *message, const int message_len) +{ + /* This code does not support key_len > block_size. */ + ASSERT(key_len <= SHA256_BLOCK_SIZE); + + /* + * i_key_pad = key (zero-padded) ^ 0x36 + * output = hash(i_key_pad || message) + * (Use output as temporary buffer) + */ + hmac_SHA256_step(output, 0x36, key, key_len, message, message_len); + + /* + * o_key_pad = key (zero-padded) ^ 0x5c + * output = hash(o_key_pad || output) + */ + hmac_SHA256_step(output, 0x5c, key, key_len, output, + SHA256_DIGEST_SIZE); +} |