Modified mbed TLS headers for AES functionality only to reduce build size
Dependents: BLE_Gateway_Linker_fix BLE_Gateway
Fork of mbedtls by
Diff: source/sha256.c
- Revision:
- 1:24750b9ad5ef
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/source/sha256.c Fri Jan 22 16:44:49 2016 -0600 @@ -0,0 +1,445 @@ +/* + * FIPS-180-2 compliant SHA-256 implementation + * + * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * This file is part of mbed TLS (https://tls.mbed.org) + */ +/* + * The SHA-256 Secure Hash Standard was published by NIST in 2002. + * + * http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf + */ + +#if !defined(MBEDTLS_CONFIG_FILE) +#include "mbedtls/config.h" +#else +#include MBEDTLS_CONFIG_FILE +#endif + +#if defined(MBEDTLS_SHA256_C) + +#include "mbedtls/sha256.h" + +#include <string.h> + +#if defined(MBEDTLS_SELF_TEST) +#if defined(MBEDTLS_PLATFORM_C) +#include "mbedtls/platform.h" +#else +#include <stdio.h> +#define mbedtls_printf printf +#endif /* MBEDTLS_PLATFORM_C */ +#endif /* MBEDTLS_SELF_TEST */ + +#if !defined(MBEDTLS_SHA256_ALT) + +/* Implementation that should never be optimized out by the compiler */ +static void mbedtls_zeroize( void *v, size_t n ) { + volatile unsigned char *p = v; while( n-- ) *p++ = 0; +} + +/* + * 32-bit integer manipulation macros (big endian) + */ +#ifndef GET_UINT32_BE +#define GET_UINT32_BE(n,b,i) \ +do { \ + (n) = ( (uint32_t) (b)[(i) ] << 24 ) \ + | ( (uint32_t) (b)[(i) + 1] << 16 ) \ + | ( (uint32_t) (b)[(i) + 2] << 8 ) \ + | ( (uint32_t) (b)[(i) + 3] ); \ +} while( 0 ) +#endif + +#ifndef PUT_UINT32_BE +#define PUT_UINT32_BE(n,b,i) \ +do { \ + (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ + (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ + (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ + (b)[(i) + 3] = (unsigned char) ( (n) ); \ +} while( 0 ) +#endif + +void mbedtls_sha256_init( mbedtls_sha256_context *ctx ) +{ + memset( ctx, 0, sizeof( mbedtls_sha256_context ) ); +} + +void mbedtls_sha256_free( mbedtls_sha256_context *ctx ) +{ + if( ctx == NULL ) + return; + + mbedtls_zeroize( ctx, sizeof( mbedtls_sha256_context ) ); +} + +void mbedtls_sha256_clone( mbedtls_sha256_context *dst, + const mbedtls_sha256_context *src ) +{ + *dst = *src; +} + +/* + * SHA-256 context setup + */ +void mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 ) +{ + ctx->total[0] = 0; + ctx->total[1] = 0; + + if( is224 == 0 ) + { + /* SHA-256 */ + ctx->state[0] = 0x6A09E667; + ctx->state[1] = 0xBB67AE85; + ctx->state[2] = 0x3C6EF372; + ctx->state[3] = 0xA54FF53A; + ctx->state[4] = 0x510E527F; + ctx->state[5] = 0x9B05688C; + ctx->state[6] = 0x1F83D9AB; + ctx->state[7] = 0x5BE0CD19; + } + else + { + /* SHA-224 */ + ctx->state[0] = 0xC1059ED8; + ctx->state[1] = 0x367CD507; + ctx->state[2] = 0x3070DD17; + ctx->state[3] = 0xF70E5939; + ctx->state[4] = 0xFFC00B31; + ctx->state[5] = 0x68581511; + ctx->state[6] = 0x64F98FA7; + ctx->state[7] = 0xBEFA4FA4; + } + + ctx->is224 = is224; +} + +#if !defined(MBEDTLS_SHA256_PROCESS_ALT) +static const uint32_t K[] = +{ + 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, +}; + +#define SHR(x,n) ((x & 0xFFFFFFFF) >> n) +#define ROTR(x,n) (SHR(x,n) | (x << (32 - n))) + +#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3)) +#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10)) + +#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22)) +#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25)) + +#define F0(x,y,z) ((x & y) | (z & (x | y))) +#define F1(x,y,z) (z ^ (x & (y ^ z))) + +#define R(t) \ +( \ + W[t] = S1(W[t - 2]) + W[t - 7] + \ + S0(W[t - 15]) + W[t - 16] \ +) + +#define P(a,b,c,d,e,f,g,h,x,K) \ +{ \ + temp1 = h + S3(e) + F1(e,f,g) + K + x; \ + temp2 = S2(a) + F0(a,b,c); \ + d += temp1; h = temp1 + temp2; \ +} + +void mbedtls_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] ) +{ + uint32_t temp1, temp2, W[64]; + uint32_t A[8]; + unsigned int i; + + for( i = 0; i < 8; i++ ) + A[i] = ctx->state[i]; + +#if defined(MBEDTLS_SHA256_SMALLER) + for( i = 0; i < 64; i++ ) + { + if( i < 16 ) + GET_UINT32_BE( W[i], data, 4 * i ); + else + R( i ); + + P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i] ); + + temp1 = A[7]; A[7] = A[6]; A[6] = A[5]; A[5] = A[4]; A[4] = A[3]; + A[3] = A[2]; A[2] = A[1]; A[1] = A[0]; A[0] = temp1; + } +#else /* MBEDTLS_SHA256_SMALLER */ + for( i = 0; i < 16; i++ ) + GET_UINT32_BE( W[i], data, 4 * i ); + + for( i = 0; i < 16; i += 8 ) + { + P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i+0], K[i+0] ); + P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], W[i+1], K[i+1] ); + P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], W[i+2], K[i+2] ); + P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], W[i+3], K[i+3] ); + P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], W[i+4], K[i+4] ); + P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], W[i+5], K[i+5] ); + P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], W[i+6], K[i+6] ); + P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], W[i+7], K[i+7] ); + } + + for( i = 16; i < 64; i += 8 ) + { + P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], R(i+0), K[i+0] ); + P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], R(i+1), K[i+1] ); + P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], R(i+2), K[i+2] ); + P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], R(i+3), K[i+3] ); + P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], R(i+4), K[i+4] ); + P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], R(i+5), K[i+5] ); + P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], R(i+6), K[i+6] ); + P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], R(i+7), K[i+7] ); + } +#endif /* MBEDTLS_SHA256_SMALLER */ + + for( i = 0; i < 8; i++ ) + ctx->state[i] += A[i]; +} +#endif /* !MBEDTLS_SHA256_PROCESS_ALT */ + +/* + * SHA-256 process buffer + */ +void mbedtls_sha256_update( mbedtls_sha256_context *ctx, const unsigned char *input, + size_t ilen ) +{ + size_t fill; + uint32_t left; + + if( ilen == 0 ) + return; + + left = ctx->total[0] & 0x3F; + fill = 64 - left; + + ctx->total[0] += (uint32_t) ilen; + ctx->total[0] &= 0xFFFFFFFF; + + if( ctx->total[0] < (uint32_t) ilen ) + ctx->total[1]++; + + if( left && ilen >= fill ) + { + memcpy( (void *) (ctx->buffer + left), input, fill ); + mbedtls_sha256_process( ctx, ctx->buffer ); + input += fill; + ilen -= fill; + left = 0; + } + + while( ilen >= 64 ) + { + mbedtls_sha256_process( ctx, input ); + input += 64; + ilen -= 64; + } + + if( ilen > 0 ) + memcpy( (void *) (ctx->buffer + left), input, ilen ); +} + +static const unsigned char sha256_padding[64] = +{ + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + +/* + * SHA-256 final digest + */ +void mbedtls_sha256_finish( mbedtls_sha256_context *ctx, unsigned char output[32] ) +{ + uint32_t last, padn; + uint32_t high, low; + unsigned char msglen[8]; + + high = ( ctx->total[0] >> 29 ) + | ( ctx->total[1] << 3 ); + low = ( ctx->total[0] << 3 ); + + PUT_UINT32_BE( high, msglen, 0 ); + PUT_UINT32_BE( low, msglen, 4 ); + + last = ctx->total[0] & 0x3F; + padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last ); + + mbedtls_sha256_update( ctx, sha256_padding, padn ); + mbedtls_sha256_update( ctx, msglen, 8 ); + + PUT_UINT32_BE( ctx->state[0], output, 0 ); + PUT_UINT32_BE( ctx->state[1], output, 4 ); + PUT_UINT32_BE( ctx->state[2], output, 8 ); + PUT_UINT32_BE( ctx->state[3], output, 12 ); + PUT_UINT32_BE( ctx->state[4], output, 16 ); + PUT_UINT32_BE( ctx->state[5], output, 20 ); + PUT_UINT32_BE( ctx->state[6], output, 24 ); + + if( ctx->is224 == 0 ) + PUT_UINT32_BE( ctx->state[7], output, 28 ); +} + +#endif /* !MBEDTLS_SHA256_ALT */ + +/* + * output = SHA-256( input buffer ) + */ +void mbedtls_sha256( const unsigned char *input, size_t ilen, + unsigned char output[32], int is224 ) +{ + mbedtls_sha256_context ctx; + + mbedtls_sha256_init( &ctx ); + mbedtls_sha256_starts( &ctx, is224 ); + mbedtls_sha256_update( &ctx, input, ilen ); + mbedtls_sha256_finish( &ctx, output ); + mbedtls_sha256_free( &ctx ); +} + +#if defined(MBEDTLS_SELF_TEST) +/* + * FIPS-180-2 test vectors + */ +static const unsigned char sha256_test_buf[3][57] = +{ + { "abc" }, + { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" }, + { "" } +}; + +static const int 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[1024]; + unsigned char sha256sum[32]; + mbedtls_sha256_context ctx; + + 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 ); + + mbedtls_sha256_starts( &ctx, k ); + + if( j == 2 ) + { + memset( buf, 'a', buflen = 1000 ); + + for( j = 0; j < 1000; j++ ) + mbedtls_sha256_update( &ctx, buf, buflen ); + } + else + mbedtls_sha256_update( &ctx, sha256_test_buf[j], + sha256_test_buflen[j] ); + + mbedtls_sha256_finish( &ctx, sha256sum ); + + if( memcmp( sha256sum, sha256_test_sum[i], 32 - k * 4 ) != 0 ) + { + if( verbose != 0 ) + mbedtls_printf( "failed\n" ); + + ret = 1; + goto exit; + } + + if( verbose != 0 ) + mbedtls_printf( "passed\n" ); + } + + if( verbose != 0 ) + mbedtls_printf( "\n" ); + +exit: + mbedtls_sha256_free( &ctx ); + + return( ret ); +} + +#endif /* MBEDTLS_SELF_TEST */ + +#endif /* MBEDTLS_SHA256_C */