diff options
Diffstat (limited to 'firmware/bdb/sha.c')
| -rw-r--r-- | firmware/bdb/sha.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/firmware/bdb/sha.c b/firmware/bdb/sha.c new file mode 100644 index 00000000..1e83662d --- /dev/null +++ b/firmware/bdb/sha.c @@ -0,0 +1,210 @@ +/* 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 <string.h> + +#include "bdb.h" + +#define VB2_SHA256_DIGEST_SIZE 32 +#define VB2_SHA256_BLOCK_SIZE 64 + +struct vb2_sha256_context { + uint32_t h[8]; + uint32_t total_size; + uint32_t size; + uint8_t block[2 * VB2_SHA256_BLOCK_SIZE]; +}; + +#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); \ + } +#define SHA256_SCR(i) \ + { \ + w[i] = SHA256_F4(w[i - 2]) + w[i - 7] \ + + SHA256_F3(w[i - 15]) + w[i - 16]; \ + } + +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 +}; + +/* SHA-256 implementation from verified boot library */ +void vb2_sha256_init(struct vb2_sha256_context *ctx) +{ + int i; + for (i = 0; i < 8; i++) { + ctx->h[i] = sha256_h0[i]; + } + ctx->size = 0; + ctx->total_size = 0; +} + +static void vb2_sha256_transform(struct vb2_sha256_context *ctx, + const uint8_t *message, + unsigned int block_nb) +{ + /* Note that these arrays use 72*4=288 bytes of stack */ + uint32_t w[64]; + uint32_t wv[8]; + uint32_t t1, t2; + const unsigned char *sub_block; + int i; + int 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]); + } + for (j = 16; j < 64; j++) { + SHA256_SCR(j); + } + for (j = 0; j < 8; j++) { + wv[j] = ctx->h[j]; + } + 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; + } + for (j = 0; j < 8; j++) { + ctx->h[j] += wv[j]; + } + } +} + +void vb2_sha256_update(struct vb2_sha256_context *ctx, + const uint8_t *data, + uint32_t size) +{ + unsigned int block_nb; + unsigned int new_size, rem_size, tmp_size; + const uint8_t *shifted_data; + tmp_size = VB2_SHA256_BLOCK_SIZE - ctx->size; + rem_size = size < tmp_size ? size : tmp_size; + memcpy(&ctx->block[ctx->size], data, rem_size); + if (ctx->size + size < VB2_SHA256_BLOCK_SIZE) { + ctx->size += size; + return; + } + new_size = size - rem_size; + block_nb = new_size / VB2_SHA256_BLOCK_SIZE; + shifted_data = data + rem_size; + vb2_sha256_transform(ctx, ctx->block, 1); + vb2_sha256_transform(ctx, shifted_data, block_nb); + rem_size = new_size % VB2_SHA256_BLOCK_SIZE; + memcpy(ctx->block, &shifted_data[block_nb << 6], + rem_size); + ctx->size = rem_size; + ctx->total_size += (block_nb + 1) << 6; +} + +void vb2_sha256_finalize(struct vb2_sha256_context *ctx, uint8_t *digest) +{ + unsigned int block_nb; + unsigned int pm_size; + unsigned int size_b; + int i; + block_nb = (1 + ((VB2_SHA256_BLOCK_SIZE - 9) + < (ctx->size % VB2_SHA256_BLOCK_SIZE))); + size_b = (ctx->total_size + ctx->size) << 3; + pm_size = block_nb << 6; + memset(ctx->block + ctx->size, 0, pm_size - ctx->size); + ctx->block[ctx->size] = 0x80; + UNPACK32(size_b, ctx->block + pm_size - 4); + vb2_sha256_transform(ctx, ctx->block, block_nb); + for (i = 0 ; i < 8; i++) { + UNPACK32(ctx->h[i], &digest[i << 2]); + } +} + +int bdb_sha256(void *digest, const void *buf, size_t size) +{ + struct vb2_sha256_context ctx; + + vb2_sha256_init(&ctx); + vb2_sha256_update(&ctx, buf, size); + vb2_sha256_finalize(&ctx, digest); + + return BDB_SUCCESS; +} |