582 lines
17 KiB
C
582 lines
17 KiB
C
/*
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* FIPS-180-2 compliant SHA-256 implementation
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* The SHA-256 Secure Hash Standard was published by NIST in 2002.
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*
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* http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
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*/
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#include "common.h"
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#if defined(MBEDTLS_SHA256_C)
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#include "mbedtls/sha256.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include <string.h>
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#include "mbedtls/platform.h"
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#define SHA256_VALIDATE_RET(cond) \
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MBEDTLS_INTERNAL_VALIDATE_RET(cond, MBEDTLS_ERR_SHA256_BAD_INPUT_DATA)
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#define SHA256_VALIDATE(cond) MBEDTLS_INTERNAL_VALIDATE(cond)
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#if !defined(MBEDTLS_SHA256_ALT)
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void mbedtls_sha256_init(mbedtls_sha256_context *ctx)
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{
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SHA256_VALIDATE(ctx != NULL);
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memset(ctx, 0, sizeof(mbedtls_sha256_context));
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}
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void mbedtls_sha256_free(mbedtls_sha256_context *ctx)
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{
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if (ctx == NULL) {
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return;
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}
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mbedtls_platform_zeroize(ctx, sizeof(mbedtls_sha256_context));
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}
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void mbedtls_sha256_clone(mbedtls_sha256_context *dst,
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const mbedtls_sha256_context *src)
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{
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SHA256_VALIDATE(dst != NULL);
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SHA256_VALIDATE(src != NULL);
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*dst = *src;
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}
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/*
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* SHA-256 context setup
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*/
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int mbedtls_sha256_starts_ret(mbedtls_sha256_context *ctx, int is224)
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{
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SHA256_VALIDATE_RET(ctx != NULL);
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SHA256_VALIDATE_RET(is224 == 0 || is224 == 1);
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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if (is224 == 0) {
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/* SHA-256 */
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ctx->state[0] = 0x6A09E667;
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ctx->state[1] = 0xBB67AE85;
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ctx->state[2] = 0x3C6EF372;
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ctx->state[3] = 0xA54FF53A;
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ctx->state[4] = 0x510E527F;
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ctx->state[5] = 0x9B05688C;
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ctx->state[6] = 0x1F83D9AB;
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ctx->state[7] = 0x5BE0CD19;
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} else {
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/* SHA-224 */
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ctx->state[0] = 0xC1059ED8;
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ctx->state[1] = 0x367CD507;
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ctx->state[2] = 0x3070DD17;
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ctx->state[3] = 0xF70E5939;
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ctx->state[4] = 0xFFC00B31;
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ctx->state[5] = 0x68581511;
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ctx->state[6] = 0x64F98FA7;
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ctx->state[7] = 0xBEFA4FA4;
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}
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ctx->is224 = is224;
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return 0;
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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void mbedtls_sha256_starts(mbedtls_sha256_context *ctx,
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int is224)
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{
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mbedtls_sha256_starts_ret(ctx, is224);
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}
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#endif
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#if !defined(MBEDTLS_SHA256_PROCESS_ALT)
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static const uint32_t K[] =
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{
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0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
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0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
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0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
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0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
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0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
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0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
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0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
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0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
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0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
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0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
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0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
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0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
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0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
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0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
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0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
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0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,
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};
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#define SHR(x, n) (((x) & 0xFFFFFFFF) >> (n))
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#define ROTR(x, n) (SHR(x, n) | ((x) << (32 - (n))))
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#define S0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
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#define S1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
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#define S2(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
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#define S3(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
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#define F0(x, y, z) (((x) & (y)) | ((z) & ((x) | (y))))
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#define F1(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define R(t) \
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( \
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local.W[t] = S1(local.W[(t) - 2]) + local.W[(t) - 7] + \
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S0(local.W[(t) - 15]) + local.W[(t) - 16] \
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)
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#define P(a, b, c, d, e, f, g, h, x, K) \
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do \
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{ \
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local.temp1 = (h) + S3(e) + F1((e), (f), (g)) + (K) + (x); \
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local.temp2 = S2(a) + F0((a), (b), (c)); \
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(d) += local.temp1; (h) = local.temp1 + local.temp2; \
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} while (0)
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int mbedtls_internal_sha256_process(mbedtls_sha256_context *ctx,
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const unsigned char data[64])
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{
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struct {
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uint32_t temp1, temp2, W[64];
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uint32_t A[8];
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} local;
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unsigned int i;
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SHA256_VALIDATE_RET(ctx != NULL);
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SHA256_VALIDATE_RET((const unsigned char *) data != NULL);
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for (i = 0; i < 8; i++) {
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local.A[i] = ctx->state[i];
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}
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#if defined(MBEDTLS_SHA256_SMALLER)
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for (i = 0; i < 64; i++) {
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if (i < 16) {
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local.W[i] = MBEDTLS_GET_UINT32_BE(data, 4 * i);
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} else {
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R(i);
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}
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P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],
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local.A[5], local.A[6], local.A[7], local.W[i], K[i]);
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local.temp1 = local.A[7]; local.A[7] = local.A[6];
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local.A[6] = local.A[5]; local.A[5] = local.A[4];
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local.A[4] = local.A[3]; local.A[3] = local.A[2];
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local.A[2] = local.A[1]; local.A[1] = local.A[0];
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local.A[0] = local.temp1;
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}
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#else /* MBEDTLS_SHA256_SMALLER */
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for (i = 0; i < 16; i++) {
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local.W[i] = MBEDTLS_GET_UINT32_BE(data, 4 * i);
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}
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for (i = 0; i < 16; i += 8) {
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P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],
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local.A[5], local.A[6], local.A[7], local.W[i+0], K[i+0]);
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P(local.A[7], local.A[0], local.A[1], local.A[2], local.A[3],
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local.A[4], local.A[5], local.A[6], local.W[i+1], K[i+1]);
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P(local.A[6], local.A[7], local.A[0], local.A[1], local.A[2],
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local.A[3], local.A[4], local.A[5], local.W[i+2], K[i+2]);
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P(local.A[5], local.A[6], local.A[7], local.A[0], local.A[1],
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local.A[2], local.A[3], local.A[4], local.W[i+3], K[i+3]);
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P(local.A[4], local.A[5], local.A[6], local.A[7], local.A[0],
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local.A[1], local.A[2], local.A[3], local.W[i+4], K[i+4]);
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P(local.A[3], local.A[4], local.A[5], local.A[6], local.A[7],
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local.A[0], local.A[1], local.A[2], local.W[i+5], K[i+5]);
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P(local.A[2], local.A[3], local.A[4], local.A[5], local.A[6],
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local.A[7], local.A[0], local.A[1], local.W[i+6], K[i+6]);
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P(local.A[1], local.A[2], local.A[3], local.A[4], local.A[5],
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local.A[6], local.A[7], local.A[0], local.W[i+7], K[i+7]);
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}
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for (i = 16; i < 64; i += 8) {
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P(local.A[0], local.A[1], local.A[2], local.A[3], local.A[4],
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local.A[5], local.A[6], local.A[7], R(i+0), K[i+0]);
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P(local.A[7], local.A[0], local.A[1], local.A[2], local.A[3],
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local.A[4], local.A[5], local.A[6], R(i+1), K[i+1]);
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P(local.A[6], local.A[7], local.A[0], local.A[1], local.A[2],
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local.A[3], local.A[4], local.A[5], R(i+2), K[i+2]);
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P(local.A[5], local.A[6], local.A[7], local.A[0], local.A[1],
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local.A[2], local.A[3], local.A[4], R(i+3), K[i+3]);
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P(local.A[4], local.A[5], local.A[6], local.A[7], local.A[0],
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local.A[1], local.A[2], local.A[3], R(i+4), K[i+4]);
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P(local.A[3], local.A[4], local.A[5], local.A[6], local.A[7],
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local.A[0], local.A[1], local.A[2], R(i+5), K[i+5]);
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P(local.A[2], local.A[3], local.A[4], local.A[5], local.A[6],
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local.A[7], local.A[0], local.A[1], R(i+6), K[i+6]);
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P(local.A[1], local.A[2], local.A[3], local.A[4], local.A[5],
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local.A[6], local.A[7], local.A[0], R(i+7), K[i+7]);
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}
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#endif /* MBEDTLS_SHA256_SMALLER */
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for (i = 0; i < 8; i++) {
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ctx->state[i] += local.A[i];
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}
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/* Zeroise buffers and variables to clear sensitive data from memory. */
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mbedtls_platform_zeroize(&local, sizeof(local));
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return 0;
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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void mbedtls_sha256_process(mbedtls_sha256_context *ctx,
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const unsigned char data[64])
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{
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mbedtls_internal_sha256_process(ctx, data);
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}
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#endif
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#endif /* !MBEDTLS_SHA256_PROCESS_ALT */
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/*
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* SHA-256 process buffer
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*/
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int mbedtls_sha256_update_ret(mbedtls_sha256_context *ctx,
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const unsigned char *input,
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size_t ilen)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t fill;
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uint32_t left;
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SHA256_VALIDATE_RET(ctx != NULL);
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SHA256_VALIDATE_RET(ilen == 0 || input != NULL);
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if (ilen == 0) {
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return 0;
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}
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += (uint32_t) ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if (ctx->total[0] < (uint32_t) ilen) {
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ctx->total[1]++;
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}
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if (left && ilen >= fill) {
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memcpy((void *) (ctx->buffer + left), input, fill);
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if ((ret = mbedtls_internal_sha256_process(ctx, ctx->buffer)) != 0) {
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return ret;
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}
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input += fill;
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ilen -= fill;
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left = 0;
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}
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while (ilen >= 64) {
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if ((ret = mbedtls_internal_sha256_process(ctx, input)) != 0) {
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return ret;
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}
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input += 64;
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ilen -= 64;
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}
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if (ilen > 0) {
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memcpy((void *) (ctx->buffer + left), input, ilen);
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}
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return 0;
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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void mbedtls_sha256_update(mbedtls_sha256_context *ctx,
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const unsigned char *input,
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size_t ilen)
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{
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mbedtls_sha256_update_ret(ctx, input, ilen);
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}
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#endif
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/*
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* SHA-256 final digest
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*/
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int mbedtls_sha256_finish_ret(mbedtls_sha256_context *ctx,
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unsigned char output[32])
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
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uint32_t used;
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uint32_t high, low;
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|
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SHA256_VALIDATE_RET(ctx != NULL);
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SHA256_VALIDATE_RET((unsigned char *) output != NULL);
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|
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/*
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* Add padding: 0x80 then 0x00 until 8 bytes remain for the length
|
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*/
|
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used = ctx->total[0] & 0x3F;
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|
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ctx->buffer[used++] = 0x80;
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|
|
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if (used <= 56) {
|
|
/* Enough room for padding + length in current block */
|
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memset(ctx->buffer + used, 0, 56 - used);
|
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} else {
|
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/* We'll need an extra block */
|
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memset(ctx->buffer + used, 0, 64 - used);
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|
|
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if ((ret = mbedtls_internal_sha256_process(ctx, ctx->buffer)) != 0) {
|
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return ret;
|
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}
|
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|
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memset(ctx->buffer, 0, 56);
|
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}
|
|
|
|
/*
|
|
* Add message length
|
|
*/
|
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high = (ctx->total[0] >> 29)
|
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| (ctx->total[1] << 3);
|
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low = (ctx->total[0] << 3);
|
|
|
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MBEDTLS_PUT_UINT32_BE(high, ctx->buffer, 56);
|
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MBEDTLS_PUT_UINT32_BE(low, ctx->buffer, 60);
|
|
|
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if ((ret = mbedtls_internal_sha256_process(ctx, ctx->buffer)) != 0) {
|
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return ret;
|
|
}
|
|
|
|
/*
|
|
* Output final state
|
|
*/
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[0], output, 0);
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[1], output, 4);
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[2], output, 8);
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[3], output, 12);
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[4], output, 16);
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[5], output, 20);
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[6], output, 24);
|
|
|
|
if (ctx->is224 == 0) {
|
|
MBEDTLS_PUT_UINT32_BE(ctx->state[7], output, 28);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
|
|
void mbedtls_sha256_finish(mbedtls_sha256_context *ctx,
|
|
unsigned char output[32])
|
|
{
|
|
mbedtls_sha256_finish_ret(ctx, output);
|
|
}
|
|
#endif
|
|
|
|
#endif /* !MBEDTLS_SHA256_ALT */
|
|
|
|
/*
|
|
* output = SHA-256( input buffer )
|
|
*/
|
|
int mbedtls_sha256_ret(const unsigned char *input,
|
|
size_t ilen,
|
|
unsigned char output[32],
|
|
int is224)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_sha256_context ctx;
|
|
|
|
SHA256_VALIDATE_RET(is224 == 0 || is224 == 1);
|
|
SHA256_VALIDATE_RET(ilen == 0 || input != NULL);
|
|
SHA256_VALIDATE_RET((unsigned char *) output != NULL);
|
|
|
|
mbedtls_sha256_init(&ctx);
|
|
|
|
if ((ret = mbedtls_sha256_starts_ret(&ctx, is224)) != 0) {
|
|
goto exit;
|
|
}
|
|
|
|
if ((ret = mbedtls_sha256_update_ret(&ctx, input, ilen)) != 0) {
|
|
goto exit;
|
|
}
|
|
|
|
if ((ret = mbedtls_sha256_finish_ret(&ctx, output)) != 0) {
|
|
goto exit;
|
|
}
|
|
|
|
exit:
|
|
mbedtls_sha256_free(&ctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
|
|
void mbedtls_sha256(const unsigned char *input,
|
|
size_t ilen,
|
|
unsigned char output[32],
|
|
int is224)
|
|
{
|
|
mbedtls_sha256_ret(input, ilen, output, is224);
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_SELF_TEST)
|
|
/*
|
|
* FIPS-180-2 test vectors
|
|
*/
|
|
static const unsigned char sha256_test_buf[3][57] =
|
|
{
|
|
{ "abc" },
|
|
{ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },
|
|
{ "" }
|
|
};
|
|
|
|
static const size_t sha256_test_buflen[3] =
|
|
{
|
|
3, 56, 1000
|
|
};
|
|
|
|
static const unsigned char sha256_test_sum[6][32] =
|
|
{
|
|
/*
|
|
* SHA-224 test vectors
|
|
*/
|
|
{ 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,
|
|
0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,
|
|
0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,
|
|
0xE3, 0x6C, 0x9D, 0xA7 },
|
|
{ 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,
|
|
0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,
|
|
0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,
|
|
0x52, 0x52, 0x25, 0x25 },
|
|
{ 0x20, 0x79, 0x46, 0x55, 0x98, 0x0C, 0x91, 0xD8,
|
|
0xBB, 0xB4, 0xC1, 0xEA, 0x97, 0x61, 0x8A, 0x4B,
|
|
0xF0, 0x3F, 0x42, 0x58, 0x19, 0x48, 0xB2, 0xEE,
|
|
0x4E, 0xE7, 0xAD, 0x67 },
|
|
|
|
/*
|
|
* SHA-256 test vectors
|
|
*/
|
|
{ 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,
|
|
0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,
|
|
0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,
|
|
0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD },
|
|
{ 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,
|
|
0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,
|
|
0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,
|
|
0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 },
|
|
{ 0xCD, 0xC7, 0x6E, 0x5C, 0x99, 0x14, 0xFB, 0x92,
|
|
0x81, 0xA1, 0xC7, 0xE2, 0x84, 0xD7, 0x3E, 0x67,
|
|
0xF1, 0x80, 0x9A, 0x48, 0xA4, 0x97, 0x20, 0x0E,
|
|
0x04, 0x6D, 0x39, 0xCC, 0xC7, 0x11, 0x2C, 0xD0 }
|
|
};
|
|
|
|
/*
|
|
* Checkup routine
|
|
*/
|
|
int mbedtls_sha256_self_test(int verbose)
|
|
{
|
|
int i, j, k, buflen, ret = 0;
|
|
unsigned char *buf;
|
|
unsigned char sha256sum[32];
|
|
mbedtls_sha256_context ctx;
|
|
|
|
buf = mbedtls_calloc(1024, sizeof(unsigned char));
|
|
if (NULL == buf) {
|
|
if (verbose != 0) {
|
|
mbedtls_printf("Buffer allocation failed\n");
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
mbedtls_sha256_init(&ctx);
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
j = i % 3;
|
|
k = i < 3;
|
|
|
|
if (verbose != 0) {
|
|
mbedtls_printf(" SHA-%d test #%d: ", 256 - k * 32, j + 1);
|
|
}
|
|
|
|
if ((ret = mbedtls_sha256_starts_ret(&ctx, k)) != 0) {
|
|
goto fail;
|
|
}
|
|
|
|
if (j == 2) {
|
|
memset(buf, 'a', buflen = 1000);
|
|
|
|
for (j = 0; j < 1000; j++) {
|
|
ret = mbedtls_sha256_update_ret(&ctx, buf, buflen);
|
|
if (ret != 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
ret = mbedtls_sha256_update_ret(&ctx, sha256_test_buf[j],
|
|
sha256_test_buflen[j]);
|
|
if (ret != 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if ((ret = mbedtls_sha256_finish_ret(&ctx, sha256sum)) != 0) {
|
|
goto fail;
|
|
}
|
|
|
|
|
|
if (memcmp(sha256sum, sha256_test_sum[i], 32 - k * 4) != 0) {
|
|
ret = 1;
|
|
goto fail;
|
|
}
|
|
|
|
if (verbose != 0) {
|
|
mbedtls_printf("passed\n");
|
|
}
|
|
}
|
|
|
|
if (verbose != 0) {
|
|
mbedtls_printf("\n");
|
|
}
|
|
|
|
goto exit;
|
|
|
|
fail:
|
|
if (verbose != 0) {
|
|
mbedtls_printf("failed\n");
|
|
}
|
|
|
|
exit:
|
|
mbedtls_sha256_free(&ctx);
|
|
mbedtls_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* MBEDTLS_SELF_TEST */
|
|
|
|
#endif /* MBEDTLS_SHA256_C */
|