Simon Cooksey / mbed-os

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features/mbedtls/src/sha256.c@0:fb7af294d5d9, 2016-11-17 (annotated)

Committer:
Simon Cooksey
Date:
Thu Nov 17 16:43:53 2016 +0000
Revision:
0:fb7af294d5d9
Initial commit

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Simon Cooksey 0:fb7af294d5d9 1 /*
Simon Cooksey 0:fb7af294d5d9 2 * FIPS-180-2 compliant SHA-256 implementation
Simon Cooksey 0:fb7af294d5d9 3 *
Simon Cooksey 0:fb7af294d5d9 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Simon Cooksey 0:fb7af294d5d9 5 * SPDX-License-Identifier: Apache-2.0
Simon Cooksey 0:fb7af294d5d9 6 *
Simon Cooksey 0:fb7af294d5d9 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
Simon Cooksey 0:fb7af294d5d9 8 * not use this file except in compliance with the License.
Simon Cooksey 0:fb7af294d5d9 9 * You may obtain a copy of the License at
Simon Cooksey 0:fb7af294d5d9 10 *
Simon Cooksey 0:fb7af294d5d9 11 * http://www.apache.org/licenses/LICENSE-2.0
Simon Cooksey 0:fb7af294d5d9 12 *
Simon Cooksey 0:fb7af294d5d9 13 * Unless required by applicable law or agreed to in writing, software
Simon Cooksey 0:fb7af294d5d9 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
Simon Cooksey 0:fb7af294d5d9 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Simon Cooksey 0:fb7af294d5d9 16 * See the License for the specific language governing permissions and
Simon Cooksey 0:fb7af294d5d9 17 * limitations under the License.
Simon Cooksey 0:fb7af294d5d9 18 *
Simon Cooksey 0:fb7af294d5d9 19 * This file is part of mbed TLS (https://tls.mbed.org)
Simon Cooksey 0:fb7af294d5d9 20 */
Simon Cooksey 0:fb7af294d5d9 21 /*
Simon Cooksey 0:fb7af294d5d9 22 * The SHA-256 Secure Hash Standard was published by NIST in 2002.
Simon Cooksey 0:fb7af294d5d9 23 *
Simon Cooksey 0:fb7af294d5d9 24 * http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
Simon Cooksey 0:fb7af294d5d9 25 */
Simon Cooksey 0:fb7af294d5d9 26
Simon Cooksey 0:fb7af294d5d9 27 #if !defined(MBEDTLS_CONFIG_FILE)
Simon Cooksey 0:fb7af294d5d9 28 #include "mbedtls/config.h"
Simon Cooksey 0:fb7af294d5d9 29 #else
Simon Cooksey 0:fb7af294d5d9 30 #include MBEDTLS_CONFIG_FILE
Simon Cooksey 0:fb7af294d5d9 31 #endif
Simon Cooksey 0:fb7af294d5d9 32
Simon Cooksey 0:fb7af294d5d9 33 #if defined(MBEDTLS_SHA256_C)
Simon Cooksey 0:fb7af294d5d9 34
Simon Cooksey 0:fb7af294d5d9 35 #include "mbedtls/sha256.h"
Simon Cooksey 0:fb7af294d5d9 36
Simon Cooksey 0:fb7af294d5d9 37 #include <string.h>
Simon Cooksey 0:fb7af294d5d9 38
Simon Cooksey 0:fb7af294d5d9 39 #if defined(MBEDTLS_SELF_TEST)
Simon Cooksey 0:fb7af294d5d9 40 #if defined(MBEDTLS_PLATFORM_C)
Simon Cooksey 0:fb7af294d5d9 41 #include "mbedtls/platform.h"
Simon Cooksey 0:fb7af294d5d9 42 #else
Simon Cooksey 0:fb7af294d5d9 43 #include <stdio.h>
Simon Cooksey 0:fb7af294d5d9 44 #include <stdlib.h>
Simon Cooksey 0:fb7af294d5d9 45 #define mbedtls_printf printf
Simon Cooksey 0:fb7af294d5d9 46 #define mbedtls_calloc calloc
Simon Cooksey 0:fb7af294d5d9 47 #define mbedtls_free free
Simon Cooksey 0:fb7af294d5d9 48 #endif /* MBEDTLS_PLATFORM_C */
Simon Cooksey 0:fb7af294d5d9 49 #endif /* MBEDTLS_SELF_TEST */
Simon Cooksey 0:fb7af294d5d9 50
Simon Cooksey 0:fb7af294d5d9 51 #if !defined(MBEDTLS_SHA256_ALT)
Simon Cooksey 0:fb7af294d5d9 52
Simon Cooksey 0:fb7af294d5d9 53 /* Implementation that should never be optimized out by the compiler */
Simon Cooksey 0:fb7af294d5d9 54 static void mbedtls_zeroize( void *v, size_t n ) {
Simon Cooksey 0:fb7af294d5d9 55 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
Simon Cooksey 0:fb7af294d5d9 56 }
Simon Cooksey 0:fb7af294d5d9 57
Simon Cooksey 0:fb7af294d5d9 58 /*
Simon Cooksey 0:fb7af294d5d9 59 * 32-bit integer manipulation macros (big endian)
Simon Cooksey 0:fb7af294d5d9 60 */
Simon Cooksey 0:fb7af294d5d9 61 #ifndef GET_UINT32_BE
Simon Cooksey 0:fb7af294d5d9 62 #define GET_UINT32_BE(n,b,i) \
Simon Cooksey 0:fb7af294d5d9 63 do { \
Simon Cooksey 0:fb7af294d5d9 64 (n) = ( (uint32_t) (b)[(i) ] << 24 ) \
Simon Cooksey 0:fb7af294d5d9 65 | ( (uint32_t) (b)[(i) + 1] << 16 ) \
Simon Cooksey 0:fb7af294d5d9 66 | ( (uint32_t) (b)[(i) + 2] << 8 ) \
Simon Cooksey 0:fb7af294d5d9 67 | ( (uint32_t) (b)[(i) + 3] ); \
Simon Cooksey 0:fb7af294d5d9 68 } while( 0 )
Simon Cooksey 0:fb7af294d5d9 69 #endif
Simon Cooksey 0:fb7af294d5d9 70
Simon Cooksey 0:fb7af294d5d9 71 #ifndef PUT_UINT32_BE
Simon Cooksey 0:fb7af294d5d9 72 #define PUT_UINT32_BE(n,b,i) \
Simon Cooksey 0:fb7af294d5d9 73 do { \
Simon Cooksey 0:fb7af294d5d9 74 (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
Simon Cooksey 0:fb7af294d5d9 75 (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
Simon Cooksey 0:fb7af294d5d9 76 (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
Simon Cooksey 0:fb7af294d5d9 77 (b)[(i) + 3] = (unsigned char) ( (n) ); \
Simon Cooksey 0:fb7af294d5d9 78 } while( 0 )
Simon Cooksey 0:fb7af294d5d9 79 #endif
Simon Cooksey 0:fb7af294d5d9 80
Simon Cooksey 0:fb7af294d5d9 81 void mbedtls_sha256_init( mbedtls_sha256_context *ctx )
Simon Cooksey 0:fb7af294d5d9 82 {
Simon Cooksey 0:fb7af294d5d9 83 memset( ctx, 0, sizeof( mbedtls_sha256_context ) );
Simon Cooksey 0:fb7af294d5d9 84 }
Simon Cooksey 0:fb7af294d5d9 85
Simon Cooksey 0:fb7af294d5d9 86 void mbedtls_sha256_free( mbedtls_sha256_context *ctx )
Simon Cooksey 0:fb7af294d5d9 87 {
Simon Cooksey 0:fb7af294d5d9 88 if( ctx == NULL )
Simon Cooksey 0:fb7af294d5d9 89 return;
Simon Cooksey 0:fb7af294d5d9 90
Simon Cooksey 0:fb7af294d5d9 91 mbedtls_zeroize( ctx, sizeof( mbedtls_sha256_context ) );
Simon Cooksey 0:fb7af294d5d9 92 }
Simon Cooksey 0:fb7af294d5d9 93
Simon Cooksey 0:fb7af294d5d9 94 void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
Simon Cooksey 0:fb7af294d5d9 95 const mbedtls_sha256_context *src )
Simon Cooksey 0:fb7af294d5d9 96 {
Simon Cooksey 0:fb7af294d5d9 97 *dst = *src;
Simon Cooksey 0:fb7af294d5d9 98 }
Simon Cooksey 0:fb7af294d5d9 99
Simon Cooksey 0:fb7af294d5d9 100 /*
Simon Cooksey 0:fb7af294d5d9 101 * SHA-256 context setup
Simon Cooksey 0:fb7af294d5d9 102 */
Simon Cooksey 0:fb7af294d5d9 103 void mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 )
Simon Cooksey 0:fb7af294d5d9 104 {
Simon Cooksey 0:fb7af294d5d9 105 ctx->total[0] = 0;
Simon Cooksey 0:fb7af294d5d9 106 ctx->total[1] = 0;
Simon Cooksey 0:fb7af294d5d9 107
Simon Cooksey 0:fb7af294d5d9 108 if( is224 == 0 )
Simon Cooksey 0:fb7af294d5d9 109 {
Simon Cooksey 0:fb7af294d5d9 110 /* SHA-256 */
Simon Cooksey 0:fb7af294d5d9 111 ctx->state[0] = 0x6A09E667;
Simon Cooksey 0:fb7af294d5d9 112 ctx->state[1] = 0xBB67AE85;
Simon Cooksey 0:fb7af294d5d9 113 ctx->state[2] = 0x3C6EF372;
Simon Cooksey 0:fb7af294d5d9 114 ctx->state[3] = 0xA54FF53A;
Simon Cooksey 0:fb7af294d5d9 115 ctx->state[4] = 0x510E527F;
Simon Cooksey 0:fb7af294d5d9 116 ctx->state[5] = 0x9B05688C;
Simon Cooksey 0:fb7af294d5d9 117 ctx->state[6] = 0x1F83D9AB;
Simon Cooksey 0:fb7af294d5d9 118 ctx->state[7] = 0x5BE0CD19;
Simon Cooksey 0:fb7af294d5d9 119 }
Simon Cooksey 0:fb7af294d5d9 120 else
Simon Cooksey 0:fb7af294d5d9 121 {
Simon Cooksey 0:fb7af294d5d9 122 /* SHA-224 */
Simon Cooksey 0:fb7af294d5d9 123 ctx->state[0] = 0xC1059ED8;
Simon Cooksey 0:fb7af294d5d9 124 ctx->state[1] = 0x367CD507;
Simon Cooksey 0:fb7af294d5d9 125 ctx->state[2] = 0x3070DD17;
Simon Cooksey 0:fb7af294d5d9 126 ctx->state[3] = 0xF70E5939;
Simon Cooksey 0:fb7af294d5d9 127 ctx->state[4] = 0xFFC00B31;
Simon Cooksey 0:fb7af294d5d9 128 ctx->state[5] = 0x68581511;
Simon Cooksey 0:fb7af294d5d9 129 ctx->state[6] = 0x64F98FA7;
Simon Cooksey 0:fb7af294d5d9 130 ctx->state[7] = 0xBEFA4FA4;
Simon Cooksey 0:fb7af294d5d9 131 }
Simon Cooksey 0:fb7af294d5d9 132
Simon Cooksey 0:fb7af294d5d9 133 ctx->is224 = is224;
Simon Cooksey 0:fb7af294d5d9 134 }
Simon Cooksey 0:fb7af294d5d9 135
Simon Cooksey 0:fb7af294d5d9 136 #if !defined(MBEDTLS_SHA256_PROCESS_ALT)
Simon Cooksey 0:fb7af294d5d9 137 static const uint32_t K[] =
Simon Cooksey 0:fb7af294d5d9 138 {
Simon Cooksey 0:fb7af294d5d9 139 0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
Simon Cooksey 0:fb7af294d5d9 140 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
Simon Cooksey 0:fb7af294d5d9 141 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
Simon Cooksey 0:fb7af294d5d9 142 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
Simon Cooksey 0:fb7af294d5d9 143 0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
Simon Cooksey 0:fb7af294d5d9 144 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
Simon Cooksey 0:fb7af294d5d9 145 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
Simon Cooksey 0:fb7af294d5d9 146 0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
Simon Cooksey 0:fb7af294d5d9 147 0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
Simon Cooksey 0:fb7af294d5d9 148 0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
Simon Cooksey 0:fb7af294d5d9 149 0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
Simon Cooksey 0:fb7af294d5d9 150 0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
Simon Cooksey 0:fb7af294d5d9 151 0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
Simon Cooksey 0:fb7af294d5d9 152 0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
Simon Cooksey 0:fb7af294d5d9 153 0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
Simon Cooksey 0:fb7af294d5d9 154 0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,
Simon Cooksey 0:fb7af294d5d9 155 };
Simon Cooksey 0:fb7af294d5d9 156
Simon Cooksey 0:fb7af294d5d9 157 #define SHR(x,n) ((x & 0xFFFFFFFF) >> n)
Simon Cooksey 0:fb7af294d5d9 158 #define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
Simon Cooksey 0:fb7af294d5d9 159
Simon Cooksey 0:fb7af294d5d9 160 #define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))
Simon Cooksey 0:fb7af294d5d9 161 #define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))
Simon Cooksey 0:fb7af294d5d9 162
Simon Cooksey 0:fb7af294d5d9 163 #define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
Simon Cooksey 0:fb7af294d5d9 164 #define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
Simon Cooksey 0:fb7af294d5d9 165
Simon Cooksey 0:fb7af294d5d9 166 #define F0(x,y,z) ((x & y) | (z & (x | y)))
Simon Cooksey 0:fb7af294d5d9 167 #define F1(x,y,z) (z ^ (x & (y ^ z)))
Simon Cooksey 0:fb7af294d5d9 168
Simon Cooksey 0:fb7af294d5d9 169 #define R(t) \
Simon Cooksey 0:fb7af294d5d9 170 ( \
Simon Cooksey 0:fb7af294d5d9 171 W[t] = S1(W[t - 2]) + W[t - 7] + \
Simon Cooksey 0:fb7af294d5d9 172 S0(W[t - 15]) + W[t - 16] \
Simon Cooksey 0:fb7af294d5d9 173 )
Simon Cooksey 0:fb7af294d5d9 174
Simon Cooksey 0:fb7af294d5d9 175 #define P(a,b,c,d,e,f,g,h,x,K) \
Simon Cooksey 0:fb7af294d5d9 176 { \
Simon Cooksey 0:fb7af294d5d9 177 temp1 = h + S3(e) + F1(e,f,g) + K + x; \
Simon Cooksey 0:fb7af294d5d9 178 temp2 = S2(a) + F0(a,b,c); \
Simon Cooksey 0:fb7af294d5d9 179 d += temp1; h = temp1 + temp2; \
Simon Cooksey 0:fb7af294d5d9 180 }
Simon Cooksey 0:fb7af294d5d9 181
Simon Cooksey 0:fb7af294d5d9 182 void mbedtls_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] )
Simon Cooksey 0:fb7af294d5d9 183 {
Simon Cooksey 0:fb7af294d5d9 184 uint32_t temp1, temp2, W[64];
Simon Cooksey 0:fb7af294d5d9 185 uint32_t A[8];
Simon Cooksey 0:fb7af294d5d9 186 unsigned int i;
Simon Cooksey 0:fb7af294d5d9 187
Simon Cooksey 0:fb7af294d5d9 188 for( i = 0; i < 8; i++ )
Simon Cooksey 0:fb7af294d5d9 189 A[i] = ctx->state[i];
Simon Cooksey 0:fb7af294d5d9 190
Simon Cooksey 0:fb7af294d5d9 191 #if defined(MBEDTLS_SHA256_SMALLER)
Simon Cooksey 0:fb7af294d5d9 192 for( i = 0; i < 64; i++ )
Simon Cooksey 0:fb7af294d5d9 193 {
Simon Cooksey 0:fb7af294d5d9 194 if( i < 16 )
Simon Cooksey 0:fb7af294d5d9 195 GET_UINT32_BE( W[i], data, 4 * i );
Simon Cooksey 0:fb7af294d5d9 196 else
Simon Cooksey 0:fb7af294d5d9 197 R( i );
Simon Cooksey 0:fb7af294d5d9 198
Simon Cooksey 0:fb7af294d5d9 199 P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i] );
Simon Cooksey 0:fb7af294d5d9 200
Simon Cooksey 0:fb7af294d5d9 201 temp1 = A[7]; A[7] = A[6]; A[6] = A[5]; A[5] = A[4]; A[4] = A[3];
Simon Cooksey 0:fb7af294d5d9 202 A[3] = A[2]; A[2] = A[1]; A[1] = A[0]; A[0] = temp1;
Simon Cooksey 0:fb7af294d5d9 203 }
Simon Cooksey 0:fb7af294d5d9 204 #else /* MBEDTLS_SHA256_SMALLER */
Simon Cooksey 0:fb7af294d5d9 205 for( i = 0; i < 16; i++ )
Simon Cooksey 0:fb7af294d5d9 206 GET_UINT32_BE( W[i], data, 4 * i );
Simon Cooksey 0:fb7af294d5d9 207
Simon Cooksey 0:fb7af294d5d9 208 for( i = 0; i < 16; i += 8 )
Simon Cooksey 0:fb7af294d5d9 209 {
Simon Cooksey 0:fb7af294d5d9 210 P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i+0], K[i+0] );
Simon Cooksey 0:fb7af294d5d9 211 P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], W[i+1], K[i+1] );
Simon Cooksey 0:fb7af294d5d9 212 P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], W[i+2], K[i+2] );
Simon Cooksey 0:fb7af294d5d9 213 P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], W[i+3], K[i+3] );
Simon Cooksey 0:fb7af294d5d9 214 P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], W[i+4], K[i+4] );
Simon Cooksey 0:fb7af294d5d9 215 P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], W[i+5], K[i+5] );
Simon Cooksey 0:fb7af294d5d9 216 P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], W[i+6], K[i+6] );
Simon Cooksey 0:fb7af294d5d9 217 P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], W[i+7], K[i+7] );
Simon Cooksey 0:fb7af294d5d9 218 }
Simon Cooksey 0:fb7af294d5d9 219
Simon Cooksey 0:fb7af294d5d9 220 for( i = 16; i < 64; i += 8 )
Simon Cooksey 0:fb7af294d5d9 221 {
Simon Cooksey 0:fb7af294d5d9 222 P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], R(i+0), K[i+0] );
Simon Cooksey 0:fb7af294d5d9 223 P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], R(i+1), K[i+1] );
Simon Cooksey 0:fb7af294d5d9 224 P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], R(i+2), K[i+2] );
Simon Cooksey 0:fb7af294d5d9 225 P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], R(i+3), K[i+3] );
Simon Cooksey 0:fb7af294d5d9 226 P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], R(i+4), K[i+4] );
Simon Cooksey 0:fb7af294d5d9 227 P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], R(i+5), K[i+5] );
Simon Cooksey 0:fb7af294d5d9 228 P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], R(i+6), K[i+6] );
Simon Cooksey 0:fb7af294d5d9 229 P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], R(i+7), K[i+7] );
Simon Cooksey 0:fb7af294d5d9 230 }
Simon Cooksey 0:fb7af294d5d9 231 #endif /* MBEDTLS_SHA256_SMALLER */
Simon Cooksey 0:fb7af294d5d9 232
Simon Cooksey 0:fb7af294d5d9 233 for( i = 0; i < 8; i++ )
Simon Cooksey 0:fb7af294d5d9 234 ctx->state[i] += A[i];
Simon Cooksey 0:fb7af294d5d9 235 }
Simon Cooksey 0:fb7af294d5d9 236 #endif /* !MBEDTLS_SHA256_PROCESS_ALT */
Simon Cooksey 0:fb7af294d5d9 237
Simon Cooksey 0:fb7af294d5d9 238 /*
Simon Cooksey 0:fb7af294d5d9 239 * SHA-256 process buffer
Simon Cooksey 0:fb7af294d5d9 240 */
Simon Cooksey 0:fb7af294d5d9 241 void mbedtls_sha256_update( mbedtls_sha256_context *ctx, const unsigned char *input,
Simon Cooksey 0:fb7af294d5d9 242 size_t ilen )
Simon Cooksey 0:fb7af294d5d9 243 {
Simon Cooksey 0:fb7af294d5d9 244 size_t fill;
Simon Cooksey 0:fb7af294d5d9 245 uint32_t left;
Simon Cooksey 0:fb7af294d5d9 246
Simon Cooksey 0:fb7af294d5d9 247 if( ilen == 0 )
Simon Cooksey 0:fb7af294d5d9 248 return;
Simon Cooksey 0:fb7af294d5d9 249
Simon Cooksey 0:fb7af294d5d9 250 left = ctx->total[0] & 0x3F;
Simon Cooksey 0:fb7af294d5d9 251 fill = 64 - left;
Simon Cooksey 0:fb7af294d5d9 252
Simon Cooksey 0:fb7af294d5d9 253 ctx->total[0] += (uint32_t) ilen;
Simon Cooksey 0:fb7af294d5d9 254 ctx->total[0] &= 0xFFFFFFFF;
Simon Cooksey 0:fb7af294d5d9 255
Simon Cooksey 0:fb7af294d5d9 256 if( ctx->total[0] < (uint32_t) ilen )
Simon Cooksey 0:fb7af294d5d9 257 ctx->total[1]++;
Simon Cooksey 0:fb7af294d5d9 258
Simon Cooksey 0:fb7af294d5d9 259 if( left && ilen >= fill )
Simon Cooksey 0:fb7af294d5d9 260 {
Simon Cooksey 0:fb7af294d5d9 261 memcpy( (void *) (ctx->buffer + left), input, fill );
Simon Cooksey 0:fb7af294d5d9 262 mbedtls_sha256_process( ctx, ctx->buffer );
Simon Cooksey 0:fb7af294d5d9 263 input += fill;
Simon Cooksey 0:fb7af294d5d9 264 ilen -= fill;
Simon Cooksey 0:fb7af294d5d9 265 left = 0;
Simon Cooksey 0:fb7af294d5d9 266 }
Simon Cooksey 0:fb7af294d5d9 267
Simon Cooksey 0:fb7af294d5d9 268 while( ilen >= 64 )
Simon Cooksey 0:fb7af294d5d9 269 {
Simon Cooksey 0:fb7af294d5d9 270 mbedtls_sha256_process( ctx, input );
Simon Cooksey 0:fb7af294d5d9 271 input += 64;
Simon Cooksey 0:fb7af294d5d9 272 ilen -= 64;
Simon Cooksey 0:fb7af294d5d9 273 }
Simon Cooksey 0:fb7af294d5d9 274
Simon Cooksey 0:fb7af294d5d9 275 if( ilen > 0 )
Simon Cooksey 0:fb7af294d5d9 276 memcpy( (void *) (ctx->buffer + left), input, ilen );
Simon Cooksey 0:fb7af294d5d9 277 }
Simon Cooksey 0:fb7af294d5d9 278
Simon Cooksey 0:fb7af294d5d9 279 static const unsigned char sha256_padding[64] =
Simon Cooksey 0:fb7af294d5d9 280 {
Simon Cooksey 0:fb7af294d5d9 281 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Simon Cooksey 0:fb7af294d5d9 282 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Simon Cooksey 0:fb7af294d5d9 283 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Simon Cooksey 0:fb7af294d5d9 284 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
Simon Cooksey 0:fb7af294d5d9 285 };
Simon Cooksey 0:fb7af294d5d9 286
Simon Cooksey 0:fb7af294d5d9 287 /*
Simon Cooksey 0:fb7af294d5d9 288 * SHA-256 final digest
Simon Cooksey 0:fb7af294d5d9 289 */
Simon Cooksey 0:fb7af294d5d9 290 void mbedtls_sha256_finish( mbedtls_sha256_context *ctx, unsigned char output[32] )
Simon Cooksey 0:fb7af294d5d9 291 {
Simon Cooksey 0:fb7af294d5d9 292 uint32_t last, padn;
Simon Cooksey 0:fb7af294d5d9 293 uint32_t high, low;
Simon Cooksey 0:fb7af294d5d9 294 unsigned char msglen[8];
Simon Cooksey 0:fb7af294d5d9 295
Simon Cooksey 0:fb7af294d5d9 296 high = ( ctx->total[0] >> 29 )
Simon Cooksey 0:fb7af294d5d9 297 | ( ctx->total[1] << 3 );
Simon Cooksey 0:fb7af294d5d9 298 low = ( ctx->total[0] << 3 );
Simon Cooksey 0:fb7af294d5d9 299
Simon Cooksey 0:fb7af294d5d9 300 PUT_UINT32_BE( high, msglen, 0 );
Simon Cooksey 0:fb7af294d5d9 301 PUT_UINT32_BE( low, msglen, 4 );
Simon Cooksey 0:fb7af294d5d9 302
Simon Cooksey 0:fb7af294d5d9 303 last = ctx->total[0] & 0x3F;
Simon Cooksey 0:fb7af294d5d9 304 padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
Simon Cooksey 0:fb7af294d5d9 305
Simon Cooksey 0:fb7af294d5d9 306 mbedtls_sha256_update( ctx, sha256_padding, padn );
Simon Cooksey 0:fb7af294d5d9 307 mbedtls_sha256_update( ctx, msglen, 8 );
Simon Cooksey 0:fb7af294d5d9 308
Simon Cooksey 0:fb7af294d5d9 309 PUT_UINT32_BE( ctx->state[0], output, 0 );
Simon Cooksey 0:fb7af294d5d9 310 PUT_UINT32_BE( ctx->state[1], output, 4 );
Simon Cooksey 0:fb7af294d5d9 311 PUT_UINT32_BE( ctx->state[2], output, 8 );
Simon Cooksey 0:fb7af294d5d9 312 PUT_UINT32_BE( ctx->state[3], output, 12 );
Simon Cooksey 0:fb7af294d5d9 313 PUT_UINT32_BE( ctx->state[4], output, 16 );
Simon Cooksey 0:fb7af294d5d9 314 PUT_UINT32_BE( ctx->state[5], output, 20 );
Simon Cooksey 0:fb7af294d5d9 315 PUT_UINT32_BE( ctx->state[6], output, 24 );
Simon Cooksey 0:fb7af294d5d9 316
Simon Cooksey 0:fb7af294d5d9 317 if( ctx->is224 == 0 )
Simon Cooksey 0:fb7af294d5d9 318 PUT_UINT32_BE( ctx->state[7], output, 28 );
Simon Cooksey 0:fb7af294d5d9 319 }
Simon Cooksey 0:fb7af294d5d9 320
Simon Cooksey 0:fb7af294d5d9 321 #endif /* !MBEDTLS_SHA256_ALT */
Simon Cooksey 0:fb7af294d5d9 322
Simon Cooksey 0:fb7af294d5d9 323 /*
Simon Cooksey 0:fb7af294d5d9 324 * output = SHA-256( input buffer )
Simon Cooksey 0:fb7af294d5d9 325 */
Simon Cooksey 0:fb7af294d5d9 326 void mbedtls_sha256( const unsigned char *input, size_t ilen,
Simon Cooksey 0:fb7af294d5d9 327 unsigned char output[32], int is224 )
Simon Cooksey 0:fb7af294d5d9 328 {
Simon Cooksey 0:fb7af294d5d9 329 mbedtls_sha256_context ctx;
Simon Cooksey 0:fb7af294d5d9 330
Simon Cooksey 0:fb7af294d5d9 331 mbedtls_sha256_init( &ctx );
Simon Cooksey 0:fb7af294d5d9 332 mbedtls_sha256_starts( &ctx, is224 );
Simon Cooksey 0:fb7af294d5d9 333 mbedtls_sha256_update( &ctx, input, ilen );
Simon Cooksey 0:fb7af294d5d9 334 mbedtls_sha256_finish( &ctx, output );
Simon Cooksey 0:fb7af294d5d9 335 mbedtls_sha256_free( &ctx );
Simon Cooksey 0:fb7af294d5d9 336 }
Simon Cooksey 0:fb7af294d5d9 337
Simon Cooksey 0:fb7af294d5d9 338 #if defined(MBEDTLS_SELF_TEST)
Simon Cooksey 0:fb7af294d5d9 339 /*
Simon Cooksey 0:fb7af294d5d9 340 * FIPS-180-2 test vectors
Simon Cooksey 0:fb7af294d5d9 341 */
Simon Cooksey 0:fb7af294d5d9 342 static const unsigned char sha256_test_buf[3][57] =
Simon Cooksey 0:fb7af294d5d9 343 {
Simon Cooksey 0:fb7af294d5d9 344 { "abc" },
Simon Cooksey 0:fb7af294d5d9 345 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },
Simon Cooksey 0:fb7af294d5d9 346 { "" }
Simon Cooksey 0:fb7af294d5d9 347 };
Simon Cooksey 0:fb7af294d5d9 348
Simon Cooksey 0:fb7af294d5d9 349 static const int sha256_test_buflen[3] =
Simon Cooksey 0:fb7af294d5d9 350 {
Simon Cooksey 0:fb7af294d5d9 351 3, 56, 1000
Simon Cooksey 0:fb7af294d5d9 352 };
Simon Cooksey 0:fb7af294d5d9 353
Simon Cooksey 0:fb7af294d5d9 354 static const unsigned char sha256_test_sum[6][32] =
Simon Cooksey 0:fb7af294d5d9 355 {
Simon Cooksey 0:fb7af294d5d9 356 /*
Simon Cooksey 0:fb7af294d5d9 357 * SHA-224 test vectors
Simon Cooksey 0:fb7af294d5d9 358 */
Simon Cooksey 0:fb7af294d5d9 359 { 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,
Simon Cooksey 0:fb7af294d5d9 360 0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,
Simon Cooksey 0:fb7af294d5d9 361 0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,
Simon Cooksey 0:fb7af294d5d9 362 0xE3, 0x6C, 0x9D, 0xA7 },
Simon Cooksey 0:fb7af294d5d9 363 { 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,
Simon Cooksey 0:fb7af294d5d9 364 0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,
Simon Cooksey 0:fb7af294d5d9 365 0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,
Simon Cooksey 0:fb7af294d5d9 366 0x52, 0x52, 0x25, 0x25 },
Simon Cooksey 0:fb7af294d5d9 367 { 0x20, 0x79, 0x46, 0x55, 0x98, 0x0C, 0x91, 0xD8,
Simon Cooksey 0:fb7af294d5d9 368 0xBB, 0xB4, 0xC1, 0xEA, 0x97, 0x61, 0x8A, 0x4B,
Simon Cooksey 0:fb7af294d5d9 369 0xF0, 0x3F, 0x42, 0x58, 0x19, 0x48, 0xB2, 0xEE,
Simon Cooksey 0:fb7af294d5d9 370 0x4E, 0xE7, 0xAD, 0x67 },
Simon Cooksey 0:fb7af294d5d9 371
Simon Cooksey 0:fb7af294d5d9 372 /*
Simon Cooksey 0:fb7af294d5d9 373 * SHA-256 test vectors
Simon Cooksey 0:fb7af294d5d9 374 */
Simon Cooksey 0:fb7af294d5d9 375 { 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,
Simon Cooksey 0:fb7af294d5d9 376 0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,
Simon Cooksey 0:fb7af294d5d9 377 0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,
Simon Cooksey 0:fb7af294d5d9 378 0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD },
Simon Cooksey 0:fb7af294d5d9 379 { 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,
Simon Cooksey 0:fb7af294d5d9 380 0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,
Simon Cooksey 0:fb7af294d5d9 381 0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,
Simon Cooksey 0:fb7af294d5d9 382 0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 },
Simon Cooksey 0:fb7af294d5d9 383 { 0xCD, 0xC7, 0x6E, 0x5C, 0x99, 0x14, 0xFB, 0x92,
Simon Cooksey 0:fb7af294d5d9 384 0x81, 0xA1, 0xC7, 0xE2, 0x84, 0xD7, 0x3E, 0x67,
Simon Cooksey 0:fb7af294d5d9 385 0xF1, 0x80, 0x9A, 0x48, 0xA4, 0x97, 0x20, 0x0E,
Simon Cooksey 0:fb7af294d5d9 386 0x04, 0x6D, 0x39, 0xCC, 0xC7, 0x11, 0x2C, 0xD0 }
Simon Cooksey 0:fb7af294d5d9 387 };
Simon Cooksey 0:fb7af294d5d9 388
Simon Cooksey 0:fb7af294d5d9 389 /*
Simon Cooksey 0:fb7af294d5d9 390 * Checkup routine
Simon Cooksey 0:fb7af294d5d9 391 */
Simon Cooksey 0:fb7af294d5d9 392 int mbedtls_sha256_self_test( int verbose )
Simon Cooksey 0:fb7af294d5d9 393 {
Simon Cooksey 0:fb7af294d5d9 394 int i, j, k, buflen, ret = 0;
Simon Cooksey 0:fb7af294d5d9 395 unsigned char *buf;
Simon Cooksey 0:fb7af294d5d9 396 unsigned char sha256sum[32];
Simon Cooksey 0:fb7af294d5d9 397 mbedtls_sha256_context ctx;
Simon Cooksey 0:fb7af294d5d9 398
Simon Cooksey 0:fb7af294d5d9 399 buf = mbedtls_calloc( 1024, sizeof(unsigned char) );
Simon Cooksey 0:fb7af294d5d9 400 if( NULL == buf )
Simon Cooksey 0:fb7af294d5d9 401 {
Simon Cooksey 0:fb7af294d5d9 402 if( verbose != 0 )
Simon Cooksey 0:fb7af294d5d9 403 mbedtls_printf( "Buffer allocation failed\n" );
Simon Cooksey 0:fb7af294d5d9 404
Simon Cooksey 0:fb7af294d5d9 405 return( 1 );
Simon Cooksey 0:fb7af294d5d9 406 }
Simon Cooksey 0:fb7af294d5d9 407
Simon Cooksey 0:fb7af294d5d9 408 mbedtls_sha256_init( &ctx );
Simon Cooksey 0:fb7af294d5d9 409
Simon Cooksey 0:fb7af294d5d9 410 for( i = 0; i < 6; i++ )
Simon Cooksey 0:fb7af294d5d9 411 {
Simon Cooksey 0:fb7af294d5d9 412 j = i % 3;
Simon Cooksey 0:fb7af294d5d9 413 k = i < 3;
Simon Cooksey 0:fb7af294d5d9 414
Simon Cooksey 0:fb7af294d5d9 415 if( verbose != 0 )
Simon Cooksey 0:fb7af294d5d9 416 mbedtls_printf( " SHA-%d test #%d: ", 256 - k * 32, j + 1 );
Simon Cooksey 0:fb7af294d5d9 417
Simon Cooksey 0:fb7af294d5d9 418 mbedtls_sha256_starts( &ctx, k );
Simon Cooksey 0:fb7af294d5d9 419
Simon Cooksey 0:fb7af294d5d9 420 if( j == 2 )
Simon Cooksey 0:fb7af294d5d9 421 {
Simon Cooksey 0:fb7af294d5d9 422 memset( buf, 'a', buflen = 1000 );
Simon Cooksey 0:fb7af294d5d9 423
Simon Cooksey 0:fb7af294d5d9 424 for( j = 0; j < 1000; j++ )
Simon Cooksey 0:fb7af294d5d9 425 mbedtls_sha256_update( &ctx, buf, buflen );
Simon Cooksey 0:fb7af294d5d9 426 }
Simon Cooksey 0:fb7af294d5d9 427 else
Simon Cooksey 0:fb7af294d5d9 428 mbedtls_sha256_update( &ctx, sha256_test_buf[j],
Simon Cooksey 0:fb7af294d5d9 429 sha256_test_buflen[j] );
Simon Cooksey 0:fb7af294d5d9 430
Simon Cooksey 0:fb7af294d5d9 431 mbedtls_sha256_finish( &ctx, sha256sum );
Simon Cooksey 0:fb7af294d5d9 432
Simon Cooksey 0:fb7af294d5d9 433 if( memcmp( sha256sum, sha256_test_sum[i], 32 - k * 4 ) != 0 )
Simon Cooksey 0:fb7af294d5d9 434 {
Simon Cooksey 0:fb7af294d5d9 435 if( verbose != 0 )
Simon Cooksey 0:fb7af294d5d9 436 mbedtls_printf( "failed\n" );
Simon Cooksey 0:fb7af294d5d9 437
Simon Cooksey 0:fb7af294d5d9 438 ret = 1;
Simon Cooksey 0:fb7af294d5d9 439 goto exit;
Simon Cooksey 0:fb7af294d5d9 440 }
Simon Cooksey 0:fb7af294d5d9 441
Simon Cooksey 0:fb7af294d5d9 442 if( verbose != 0 )
Simon Cooksey 0:fb7af294d5d9 443 mbedtls_printf( "passed\n" );
Simon Cooksey 0:fb7af294d5d9 444 }
Simon Cooksey 0:fb7af294d5d9 445
Simon Cooksey 0:fb7af294d5d9 446 if( verbose != 0 )
Simon Cooksey 0:fb7af294d5d9 447 mbedtls_printf( "\n" );
Simon Cooksey 0:fb7af294d5d9 448
Simon Cooksey 0:fb7af294d5d9 449 exit:
Simon Cooksey 0:fb7af294d5d9 450 mbedtls_sha256_free( &ctx );
Simon Cooksey 0:fb7af294d5d9 451 mbedtls_free( buf );
Simon Cooksey 0:fb7af294d5d9 452
Simon Cooksey 0:fb7af294d5d9 453 return( ret );
Simon Cooksey 0:fb7af294d5d9 454 }
Simon Cooksey 0:fb7af294d5d9 455
Simon Cooksey 0:fb7af294d5d9 456 #endif /* MBEDTLS_SELF_TEST */
Simon Cooksey 0:fb7af294d5d9 457
Simon Cooksey 0:fb7af294d5d9 458 #endif /* MBEDTLS_SHA256_C */