/* Copyright (C) 2002, 2004, 2006 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* Original Source from: http://www.faqs.org/rfcs/rfc3174.html DESCRIPTION This file implements the Secure Hashing Algorithm 1 as defined in FIPS PUB 180-1 published April 17, 1995. The SHA-1, produces a 160-bit message digest for a given data stream. It should take about 2**n steps to find a message with the same digest as a given message and 2**(n/2) to find any two messages with the same digest, when n is the digest size in bits. Therefore, this algorithm can serve as a means of providing a "fingerprint" for a message. PORTABILITY ISSUES SHA-1 is defined in terms of 32-bit "words". This code uses (included via "sha1.h" to define 32 and 8 bit unsigned integer types. If your C compiler does not support 32 bit unsigned integers, this code is not appropriate. CAVEATS SHA-1 is designed to work with messages less than 2^64 bits long. Although SHA-1 allows a message digest to be generated for messages of any number of bits less than 2^64, this implementation only works with messages with a length that is a multiple of the size of an 8-bit character. CHANGES 2002 by Peter Zaitsev to - fit to new prototypes according to MySQL standard - Some optimizations - All checking is now done in debug only mode - More comments */ #include "my_global.h" #include "m_string.h" #include "sha1.h" /* Define the SHA1 circular left shift macro */ #define SHA1CircularShift(bits,word) \ (((word) << (bits)) | ((word) >> (32-(bits)))) /* Local Function Prototyptes */ static void SHA1PadMessage(SHA1_CONTEXT*); static void SHA1ProcessMessageBlock(SHA1_CONTEXT*); /* Initialize SHA1Context SYNOPSIS mysql_sha1_reset() context [in/out] The context to reset. DESCRIPTION This function will initialize the SHA1Context in preparation for computing a new SHA1 message digest. RETURN SHA_SUCCESS ok != SHA_SUCCESS sha Error Code. */ const uint32 sha_const_key[5]= { 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0 }; int mysql_sha1_reset(SHA1_CONTEXT *context) { context->Length = 0; context->Message_Block_Index = 0; context->Intermediate_Hash[0] = sha_const_key[0]; context->Intermediate_Hash[1] = sha_const_key[1]; context->Intermediate_Hash[2] = sha_const_key[2]; context->Intermediate_Hash[3] = sha_const_key[3]; context->Intermediate_Hash[4] = sha_const_key[4]; context->Computed = 0; context->Corrupted = 0; return SHA_SUCCESS; } /* Return the 160-bit message digest into the array provided by the caller SYNOPSIS mysql_sha1_result() context [in/out] The context to use to calculate the SHA-1 hash. Message_Digest: [out] Where the digest is returned. DESCRIPTION NOTE: The first octet of hash is stored in the 0th element, the last octet of hash in the 19th element. RETURN SHA_SUCCESS ok != SHA_SUCCESS sha Error Code. */ int mysql_sha1_result(SHA1_CONTEXT *context, uint8 Message_Digest[SHA1_HASH_SIZE]) { int i; if (!context->Computed) { SHA1PadMessage(context); /* message may be sensitive, clear it out */ bzero((char*) context->Message_Block,64); context->Length = 0; /* and clear length */ context->Computed = 1; } for (i = 0; i < SHA1_HASH_SIZE; i++) Message_Digest[i] = (int8)((context->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) ))); return SHA_SUCCESS; } /* Accepts an array of octets as the next portion of the message. SYNOPSIS mysql_sha1_input() context [in/out] The SHA context to update message_array An array of characters representing the next portion of the message. length The length of the message in message_array RETURN SHA_SUCCESS ok != SHA_SUCCESS sha Error Code. */ int mysql_sha1_input(SHA1_CONTEXT *context, const uint8 *message_array, unsigned length) { if (!length) return SHA_SUCCESS; while (length--) { context->Message_Block[context->Message_Block_Index++]= (*message_array & 0xFF); context->Length += 8; /* Length is in bits */ if (context->Message_Block_Index == 64) { SHA1ProcessMessageBlock(context); } message_array++; } return SHA_SUCCESS; } /* Process the next 512 bits of the message stored in the Message_Block array. SYNOPSIS SHA1ProcessMessageBlock() DESCRIPTION Many of the variable names in this code, especially the single character names, were used because those were the names used in the publication. */ /* Constants defined in SHA-1 */ static const uint32 K[]= { 0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6 }; static void SHA1ProcessMessageBlock(SHA1_CONTEXT *context) { int t; /* Loop counter */ uint32 temp; /* Temporary word value */ uint32 W[80]; /* Word sequence */ uint32 A, B, C, D, E; /* Word buffers */ int idx; /* Initialize the first 16 words in the array W */ for (t = 0; t < 16; t++) { idx=t*4; W[t] = context->Message_Block[idx] << 24; W[t] |= context->Message_Block[idx + 1] << 16; W[t] |= context->Message_Block[idx + 2] << 8; W[t] |= context->Message_Block[idx + 3]; } for (t = 16; t < 80; t++) { W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); } A = context->Intermediate_Hash[0]; B = context->Intermediate_Hash[1]; C = context->Intermediate_Hash[2]; D = context->Intermediate_Hash[3]; E = context->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; } context->Intermediate_Hash[0] += A; context->Intermediate_Hash[1] += B; context->Intermediate_Hash[2] += C; context->Intermediate_Hash[3] += D; context->Intermediate_Hash[4] += E; context->Message_Block_Index = 0; } /* Pad message SYNOPSIS SHA1PadMessage() context: [in/out] The context to pad DESCRIPTION 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. */ static void SHA1PadMessage(SHA1_CONTEXT *context) { /* 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. */ int i=context->Message_Block_Index; if (i > 55) { context->Message_Block[i++] = 0x80; bzero((char*) &context->Message_Block[i], sizeof(context->Message_Block[0])*(64-i)); context->Message_Block_Index=64; /* This function sets context->Message_Block_Index to zero */ SHA1ProcessMessageBlock(context); bzero((char*) &context->Message_Block[0], sizeof(context->Message_Block[0])*56); context->Message_Block_Index=56; } else { context->Message_Block[i++] = 0x80; bzero((char*) &context->Message_Block[i], sizeof(context->Message_Block[0])*(56-i)); context->Message_Block_Index=56; } /* Store the message length as the last 8 octets */ context->Message_Block[56] = (int8) (context->Length >> 56); context->Message_Block[57] = (int8) (context->Length >> 48); context->Message_Block[58] = (int8) (context->Length >> 40); context->Message_Block[59] = (int8) (context->Length >> 32); context->Message_Block[60] = (int8) (context->Length >> 24); context->Message_Block[61] = (int8) (context->Length >> 16); context->Message_Block[62] = (int8) (context->Length >> 8); context->Message_Block[63] = (int8) (context->Length); SHA1ProcessMessageBlock(context); }