diff options
Diffstat (limited to 'third_party/sha2/sha256.c')
| -rw-r--r-- | third_party/sha2/sha256.c | 297 |
1 files changed, 0 insertions, 297 deletions
diff --git a/third_party/sha2/sha256.c b/third_party/sha2/sha256.c deleted file mode 100644 index 2d6eaa43f2..0000000000 --- a/third_party/sha2/sha256.c +++ /dev/null @@ -1,297 +0,0 @@ -/* 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 "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); -} |