From 2ab3d99967d68c79351fe2a3df22c445447e3010 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Tue, 15 Nov 2011 22:28:48 +0100 Subject: Initial import. --- axTLS/src/crypto/sha1.c | 249 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 249 insertions(+) create mode 100644 axTLS/src/crypto/sha1.c (limited to 'axTLS/src/crypto/sha1.c') diff --git a/axTLS/src/crypto/sha1.c b/axTLS/src/crypto/sha1.c new file mode 100644 index 0000000..1082733 --- /dev/null +++ b/axTLS/src/crypto/sha1.c @@ -0,0 +1,249 @@ +/* + * Copyright (c) 2007, Cameron Rich + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * * 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. + * * Neither the name of the axTLS 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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. + */ + +/** + * SHA1 implementation - as defined in FIPS PUB 180-1 published April 17, 1995. + * This code was originally taken from RFC3174 + */ + +#include +#include "os_port.h" +#include "crypto.h" + +/* + * Define the SHA1 circular left shift macro + */ +#define SHA1CircularShift(bits,word) \ + (((word) << (bits)) | ((word) >> (32-(bits)))) + +/* ----- static functions ----- */ +static void SHA1PadMessage(SHA1_CTX *ctx); +static void SHA1ProcessMessageBlock(SHA1_CTX *ctx); + +/** + * Initialize the SHA1 context + */ +void SHA1_Init(SHA1_CTX *ctx) +{ + ctx->Length_Low = 0; + ctx->Length_High = 0; + ctx->Message_Block_Index = 0; + ctx->Intermediate_Hash[0] = 0x67452301; + ctx->Intermediate_Hash[1] = 0xEFCDAB89; + ctx->Intermediate_Hash[2] = 0x98BADCFE; + ctx->Intermediate_Hash[3] = 0x10325476; + ctx->Intermediate_Hash[4] = 0xC3D2E1F0; +} + +/** + * Accepts an array of octets as the next portion of the message. + */ +void SHA1_Update(SHA1_CTX *ctx, const uint8_t *msg, int len) +{ + while (len--) + { + ctx->Message_Block[ctx->Message_Block_Index++] = (*msg & 0xFF); + ctx->Length_Low += 8; + + if (ctx->Length_Low == 0) + ctx->Length_High++; + + if (ctx->Message_Block_Index == 64) + SHA1ProcessMessageBlock(ctx); + + msg++; + } +} + +/** + * Return the 160-bit message digest into the user's array + */ +void SHA1_Final(uint8_t *digest, SHA1_CTX *ctx) +{ + int i; + + SHA1PadMessage(ctx); + memset(ctx->Message_Block, 0, 64); + ctx->Length_Low = 0; /* and clear length */ + ctx->Length_High = 0; + + for (i = 0; i < SHA1_SIZE; i++) + { + digest[i] = ctx->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) ); + } +} + +/** + * Process the next 512 bits of the message stored in the array. + */ +static void SHA1ProcessMessageBlock(SHA1_CTX *ctx) +{ + const uint32_t K[] = { /* Constants defined in SHA-1 */ + 0x5A827999, + 0x6ED9EBA1, + 0x8F1BBCDC, + 0xCA62C1D6 + }; + int t; /* Loop counter */ + uint32_t temp; /* Temporary word value */ + uint32_t W[80]; /* Word sequence */ + uint32_t A, B, C, D, E; /* Word buffers */ + + /* + * Initialize the first 16 words in the array W + */ + for (t = 0; t < 16; t++) + { + W[t] = ctx->Message_Block[t * 4] << 24; + W[t] |= ctx->Message_Block[t * 4 + 1] << 16; + W[t] |= ctx->Message_Block[t * 4 + 2] << 8; + W[t] |= ctx->Message_Block[t * 4 + 3]; + } + + for (t = 16; t < 80; t++) + { + W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); + } + + A = ctx->Intermediate_Hash[0]; + B = ctx->Intermediate_Hash[1]; + C = ctx->Intermediate_Hash[2]; + D = ctx->Intermediate_Hash[3]; + E = ctx->Intermediate_Hash[4]; + + for (t = 0; t < 20; t++) + { + temp = SHA1CircularShift(5,A) + + ((B & C) | ((~B) & D)) + E + W[t] + K[0]; + E = D; + D = C; + C = SHA1CircularShift(30,B); + + B = A; + A = temp; + } + + for (t = 20; t < 40; t++) + { + temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1]; + E = D; + D = C; + C = SHA1CircularShift(30,B); + B = A; + A = temp; + } + + for (t = 40; t < 60; t++) + { + temp = SHA1CircularShift(5,A) + + ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; + E = D; + D = C; + C = SHA1CircularShift(30,B); + B = A; + A = temp; + } + + for (t = 60; t < 80; t++) + { + temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3]; + E = D; + D = C; + C = SHA1CircularShift(30,B); + B = A; + A = temp; + } + + ctx->Intermediate_Hash[0] += A; + ctx->Intermediate_Hash[1] += B; + ctx->Intermediate_Hash[2] += C; + ctx->Intermediate_Hash[3] += D; + ctx->Intermediate_Hash[4] += E; + ctx->Message_Block_Index = 0; +} + +/* + * According to the standard, the message must be padded to an even + * 512 bits. The first padding bit must be a '1'. The last 64 + * bits represent the length of the original message. All bits in + * between should be 0. This function will pad the message + * according to those rules by filling the Message_Block array + * accordingly. It will also call the ProcessMessageBlock function + * provided appropriately. When it returns, it can be assumed that + * the message digest has been computed. + * + * @param ctx [in, out] The SHA1 context + */ +static void SHA1PadMessage(SHA1_CTX *ctx) +{ + /* + * Check to see if the current message block is too small to hold + * the initial padding bits and length. If so, we will pad the + * block, process it, and then continue padding into a second + * block. + */ + if (ctx->Message_Block_Index > 55) + { + ctx->Message_Block[ctx->Message_Block_Index++] = 0x80; + while(ctx->Message_Block_Index < 64) + { + ctx->Message_Block[ctx->Message_Block_Index++] = 0; + } + + SHA1ProcessMessageBlock(ctx); + + while (ctx->Message_Block_Index < 56) + { + ctx->Message_Block[ctx->Message_Block_Index++] = 0; + } + } + else + { + ctx->Message_Block[ctx->Message_Block_Index++] = 0x80; + while(ctx->Message_Block_Index < 56) + { + + ctx->Message_Block[ctx->Message_Block_Index++] = 0; + } + } + + /* + * Store the message length as the last 8 octets + */ + ctx->Message_Block[56] = ctx->Length_High >> 24; + ctx->Message_Block[57] = ctx->Length_High >> 16; + ctx->Message_Block[58] = ctx->Length_High >> 8; + ctx->Message_Block[59] = ctx->Length_High; + ctx->Message_Block[60] = ctx->Length_Low >> 24; + ctx->Message_Block[61] = ctx->Length_Low >> 16; + ctx->Message_Block[62] = ctx->Length_Low >> 8; + ctx->Message_Block[63] = ctx->Length_Low; + SHA1ProcessMessageBlock(ctx); +} -- cgit v1.2.3