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415 lines
12 KiB
415 lines
12 KiB
/**************************** sha1.c ***************************/
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/***************** See RFC 6234 for details. *******************/
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/* Copyright (c) 2011 IETF Trust and the persons identified as */
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/* authors of the code. All rights reserved. */
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/* See sha.h for terms of use and redistribution. */
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/*
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* Description:
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* This file implements the Secure Hash Algorithm SHA-1
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* as defined in the U.S. National Institute of Standards
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* and Technology Federal Information Processing Standards
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* Publication (FIPS PUB) 180-3 published in October 2008
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* and formerly defined in its predecessors, FIPS PUB 180-1
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* and FIP PUB 180-2.
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*
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* A combined document showing all algorithms is available at
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* http://csrc.nist.gov/publications/fips/
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* fips180-3/fips180-3_final.pdf
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*
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* The SHA-1 algorithm produces a 160-bit message digest for a
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* given data stream that can serve as a means of providing a
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* "fingerprint" for a message.
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*
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* Portability Issues:
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* SHA-1 is defined in terms of 32-bit "words". This code
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* uses <stdint.h> (included via "sha.h") to define 32- and
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* 8-bit unsigned integer types. If your C compiler does
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* not support 32-bit unsigned integers, this code is not
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* appropriate.
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*
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* Caveats:
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* SHA-1 is designed to work with messages less than 2^64 bits
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* long. This implementation uses SHA1Input() to hash the bits
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* that are a multiple of the size of an 8-bit octet, and then
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* optionally uses SHA1FinalBits() to hash the final few bits of
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* the input.
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*/
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#include "sha.h"
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#include "sha-private.h"
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/*
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* Define the SHA1 circular left shift macro
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*/
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#define SHA1_ROTL(bits,word) \
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(((word) << (bits)) | ((word) >> (32-(bits))))
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/*
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* Add "length" to the length.
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* Set Corrupted when overflow has occurred.
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*/
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static uint32_t addTemp;
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#define SHA1AddLength(context, length) \
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(addTemp = (context)->Length_Low, \
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(context)->Corrupted = \
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(((context)->Length_Low += (length)) < addTemp) && \
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(++(context)->Length_High == 0) ? shaInputTooLong \
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: (context)->Corrupted )
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/* Local Function Prototypes */
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static void SHA1ProcessMessageBlock(SHA1Context *context);
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static void SHA1Finalize(SHA1Context *context, uint8_t Pad_Byte);
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static void SHA1PadMessage(SHA1Context *context, uint8_t Pad_Byte);
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/*
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* SHA1Reset
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*
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* Description:
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* This function will initialize the SHA1Context in preparation
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* for computing a new SHA1 message digest.
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*
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* Parameters:
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* context: [in/out]
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* The context to reset.
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*
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* Returns:
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* sha Error Code.
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*
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*/
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int SHA1Reset(SHA1Context *context)
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{
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if (!context) return shaNull;
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context->Length_High = context->Length_Low = 0;
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context->Message_Block_Index = 0;
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/* Initial Hash Values: FIPS 180-3 section 5.3.1 */
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context->Intermediate_Hash[0] = 0x67452301;
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context->Intermediate_Hash[1] = 0xEFCDAB89;
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context->Intermediate_Hash[2] = 0x98BADCFE;
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context->Intermediate_Hash[3] = 0x10325476;
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context->Intermediate_Hash[4] = 0xC3D2E1F0;
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context->Computed = 0;
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context->Corrupted = shaSuccess;
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return shaSuccess;
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}
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/*
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* SHA1Input
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*
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* Description:
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* This function accepts an array of octets as the next portion
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* of the message.
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*
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* Parameters:
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* context: [in/out]
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* The SHA context to update.
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* message_array[ ]: [in]
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* An array of octets representing the next portion of
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* the message.
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* length: [in]
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* The length of the message in message_array.
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*
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* Returns:
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* sha Error Code.
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*
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*/
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int SHA1Input(SHA1Context *context,
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const uint8_t *message_array, unsigned length)
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{
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if (!context) return shaNull;
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if (!length) return shaSuccess;
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if (!message_array) return shaNull;
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if (context->Computed) return context->Corrupted = shaStateError;
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if (context->Corrupted) return context->Corrupted;
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while (length--) {
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context->Message_Block[context->Message_Block_Index++] =
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*message_array;
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if ((SHA1AddLength(context, 8) == shaSuccess) &&
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(context->Message_Block_Index == SHA1_Message_Block_Size))
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SHA1ProcessMessageBlock(context);
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message_array++;
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}
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return context->Corrupted;
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}
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/*
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* SHA1FinalBits
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*
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* Description:
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* This function will add in any final bits of the message.
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*
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* Parameters:
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* context: [in/out]
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* The SHA context to update.
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* message_bits: [in]
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* The final bits of the message, in the upper portion of the
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* byte. (Use 0b###00000 instead of 0b00000### to input the
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* three bits ###.)
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* length: [in]
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* The number of bits in message_bits, between 1 and 7.
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*
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* Returns:
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* sha Error Code.
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*/
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int SHA1FinalBits(SHA1Context *context, uint8_t message_bits,
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unsigned int length)
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{
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static uint8_t masks[8] = {
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/* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
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/* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
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/* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
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/* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
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};
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static uint8_t markbit[8] = {
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/* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
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/* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
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/* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
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/* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
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};
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if (!context) return shaNull;
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if (!length) return shaSuccess;
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if (context->Corrupted) return context->Corrupted;
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if (context->Computed) return context->Corrupted = shaStateError;
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if (length >= 8) return context->Corrupted = shaBadParam;
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SHA1AddLength(context, length);
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SHA1Finalize(context,
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(uint8_t) ((message_bits & masks[length]) | markbit[length]));
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return context->Corrupted;
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}
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/*
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* SHA1Result
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*
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* Description:
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* This function will return the 160-bit message digest
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* into the Message_Digest array provided by the caller.
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* NOTE:
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* The first octet of hash is stored in the element with index 0,
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* the last octet of hash in the element with index 19.
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*
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* Parameters:
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* context: [in/out]
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* The context to use to calculate the SHA-1 hash.
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* Message_Digest[ ]: [out]
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* Where the digest is returned.
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*
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* Returns:
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* sha Error Code.
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*
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*/
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int SHA1Result(SHA1Context *context,
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uint8_t Message_Digest[SHA1HashSize])
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{
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int i;
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if (!context) return shaNull;
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if (!Message_Digest) return shaNull;
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if (context->Corrupted) return context->Corrupted;
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if (!context->Computed)
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SHA1Finalize(context, 0x80);
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for (i = 0; i < SHA1HashSize; ++i)
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Message_Digest[i] = (uint8_t) (context->Intermediate_Hash[i>>2]
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>> (8 * ( 3 - ( i & 0x03 ) )));
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return shaSuccess;
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}
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/*
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* SHA1ProcessMessageBlock
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*
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* Description:
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* This helper function will process the next 512 bits of the
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* message stored in the Message_Block array.
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*
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* Parameters:
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* context: [in/out]
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* The SHA context to update.
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*
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* Returns:
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* Nothing.
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*
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* Comments:
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* Many of the variable names in this code, especially the
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* single character names, were used because those were the
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* names used in the Secure Hash Standard.
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*/
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static void SHA1ProcessMessageBlock(SHA1Context *context)
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{
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/* Constants defined in FIPS 180-3, section 4.2.1 */
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const uint32_t K[4] = {
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0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6
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};
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int t; /* Loop counter */
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uint32_t temp; /* Temporary word value */
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uint32_t W[80]; /* Word sequence */
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uint32_t A, B, C, D, E; /* Word buffers */
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/*
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* Initialize the first 16 words in the array W
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*/
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for (t = 0; t < 16; t++) {
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W[t] = ((uint32_t)context->Message_Block[t * 4]) << 24;
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W[t] |= ((uint32_t)context->Message_Block[t * 4 + 1]) << 16;
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W[t] |= ((uint32_t)context->Message_Block[t * 4 + 2]) << 8;
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W[t] |= ((uint32_t)context->Message_Block[t * 4 + 3]);
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}
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for (t = 16; t < 80; t++)
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W[t] = SHA1_ROTL(1, W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
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A = context->Intermediate_Hash[0];
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B = context->Intermediate_Hash[1];
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C = context->Intermediate_Hash[2];
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D = context->Intermediate_Hash[3];
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E = context->Intermediate_Hash[4];
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for (t = 0; t < 20; t++) {
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temp = SHA1_ROTL(5,A) + SHA_Ch(B, C, D) + E + W[t] + K[0];
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E = D;
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D = C;
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C = SHA1_ROTL(30,B);
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B = A;
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A = temp;
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}
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for (t = 20; t < 40; t++) {
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temp = SHA1_ROTL(5,A) + SHA_Parity(B, C, D) + E + W[t] + K[1];
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E = D;
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D = C;
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C = SHA1_ROTL(30,B);
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B = A;
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A = temp;
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}
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for (t = 40; t < 60; t++) {
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temp = SHA1_ROTL(5,A) + SHA_Maj(B, C, D) + E + W[t] + K[2];
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E = D;
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D = C;
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C = SHA1_ROTL(30,B);
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B = A;
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A = temp;
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}
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for (t = 60; t < 80; t++) {
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temp = SHA1_ROTL(5,A) + SHA_Parity(B, C, D) + E + W[t] + K[3];
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E = D;
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D = C;
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C = SHA1_ROTL(30,B);
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B = A;
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A = temp;
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}
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context->Intermediate_Hash[0] += A;
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context->Intermediate_Hash[1] += B;
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context->Intermediate_Hash[2] += C;
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context->Intermediate_Hash[3] += D;
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context->Intermediate_Hash[4] += E;
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context->Message_Block_Index = 0;
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}
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/*
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* SHA1Finalize
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*
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* Description:
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* This helper function finishes off the digest calculations.
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*
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* Parameters:
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* context: [in/out]
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* The SHA context to update.
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* Pad_Byte: [in]
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* The last byte to add to the message block before the 0-padding
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* and length. This will contain the last bits of the message
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* followed by another single bit. If the message was an
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* exact multiple of 8-bits long, Pad_Byte will be 0x80.
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*
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* Returns:
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* sha Error Code.
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*
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*/
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static void SHA1Finalize(SHA1Context *context, uint8_t Pad_Byte)
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{
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int i;
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SHA1PadMessage(context, Pad_Byte);
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/* message may be sensitive, clear it out */
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for (i = 0; i < SHA1_Message_Block_Size; ++i)
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context->Message_Block[i] = 0;
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context->Length_High = 0; /* and clear length */
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context->Length_Low = 0;
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context->Computed = 1;
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}
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/*
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* SHA1PadMessage
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*
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* Description:
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* According to the standard, the message must be padded to the next
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* even multiple of 512 bits. The first padding bit must be a '1'.
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* The last 64 bits represent the length of the original message.
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* All bits in between should be 0. This helper function will pad
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* the message according to those rules by filling the Message_Block
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* array accordingly. When it returns, it can be assumed that the
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* message digest has been computed.
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*
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* Parameters:
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* context: [in/out]
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* The context to pad.
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* Pad_Byte: [in]
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* The last byte to add to the message block before the 0-padding
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* and length. This will contain the last bits of the message
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* followed by another single bit. If the message was an
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* exact multiple of 8-bits long, Pad_Byte will be 0x80.
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*
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* Returns:
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* Nothing.
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*/
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static void SHA1PadMessage(SHA1Context *context, uint8_t Pad_Byte)
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{
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/*
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* Check to see if the current message block is too small to hold
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* the initial padding bits and length. If so, we will pad the
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* block, process it, and then continue padding into a second
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* block.
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*/
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if (context->Message_Block_Index >= (SHA1_Message_Block_Size - 8)) {
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context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
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while (context->Message_Block_Index < SHA1_Message_Block_Size)
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context->Message_Block[context->Message_Block_Index++] = 0;
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SHA1ProcessMessageBlock(context);
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} else
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context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
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while (context->Message_Block_Index < (SHA1_Message_Block_Size - 8))
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context->Message_Block[context->Message_Block_Index++] = 0;
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/*
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* Store the message length as the last 8 octets
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*/
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context->Message_Block[56] = (uint8_t) (context->Length_High >> 24);
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context->Message_Block[57] = (uint8_t) (context->Length_High >> 16);
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context->Message_Block[58] = (uint8_t) (context->Length_High >> 8);
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context->Message_Block[59] = (uint8_t) (context->Length_High);
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context->Message_Block[60] = (uint8_t) (context->Length_Low >> 24);
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context->Message_Block[61] = (uint8_t) (context->Length_Low >> 16);
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context->Message_Block[62] = (uint8_t) (context->Length_Low >> 8);
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context->Message_Block[63] = (uint8_t) (context->Length_Low);
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SHA1ProcessMessageBlock(context);
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}
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