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60f18e5554
git-svn-id: file:///Users/lillianskinner/Downloads/platinum/twl/TwlIPL/trunk@1 b08762b0-b915-fc4b-9d8c-17b2551a87ff
454 lines
12 KiB
C
454 lines
12 KiB
C
/*
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* sha1.c
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*
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* Description:
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* This file implements the Secure Hashing Algorithm 1 as
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* defined in FIPS PUB 180-1 published April 17, 1995.
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*
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* The SHA-1, produces a 160-bit message digest for a given
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* data stream. It should take about 2**n steps to find a
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* message with the same digest as a given message and
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* 2**(n/2) to find any two messages with the same digest,
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* when n is the digest size in bits. Therefore, this
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* algorithm 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 "sha1.h" to define 32 and 8
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* bit unsigned integer types. If your C compiler does not
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* 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. Although SHA-1 allows a message digest to be generated
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* for messages of any number of bits less than 2^64, this
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* implementation only works with messages with a length that is
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* a multiple of the size of an 8-bit character.
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*
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*/
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#include "sha1.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 SHA1CircularShift(bits,word) \
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(((word) << (bits)) | ((word) >> (32-(bits))))
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/* Local Function Prototyptes */
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void SHA1PadMessage(SHA1Context *);
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void SHA1ProcessMessageBlock(SHA1Context *);
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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)
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{
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return shaNull;
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}
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context->Length_Low = 0;
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context->Length_High = 0;
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context->Message_Block_Index = 0;
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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 = 0;
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return shaSuccess;
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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 into the
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* Message_Digest array provided by the caller.
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* NOTE: The first octet of hash is stored in the 0th element,
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* the last octet of hash in the 19th element.
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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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unsigned char Message_Digest[20])
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{
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int i;
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if (!context || !Message_Digest)
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{
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return shaNull;
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}
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if (context->Corrupted)
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{
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return context->Corrupted;
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}
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if (!context->Computed)
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{
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SHA1PadMessage(context);
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for(i=0; i<64; ++i)
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{
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/* message may be sensitive, clear it out */
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context->Message_Block[i] = 0;
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}
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context->Length_Low = 0; /* and clear length */
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context->Length_High = 0;
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context->Computed = 1;
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}
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for(i = 0; i < 20; ++i)
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{
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Message_Digest[i] = (unsigned char)
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(context->Intermediate_Hash[i>>2]
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>> 8 * ( 3 - ( i & 0x03 ) ));
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}
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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 characters 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 unsigned char *message_array,
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unsigned int length)
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{
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if (!length)
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{
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return shaSuccess;
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}
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if (!context || !message_array)
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{
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return shaNull;
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}
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if (context->Computed)
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{
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context->Corrupted = shaStateError;
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return shaStateError;
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}
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if (context->Corrupted)
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{
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return context->Corrupted;
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}
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while(length-- && !context->Corrupted)
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{
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context->Message_Block[context->Message_Block_Index++] =
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(unsigned char)(*message_array & 0xFF);
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context->Length_Low += 8;
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if (context->Length_Low == 0)
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{
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context->Length_High++;
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if (context->Length_High == 0)
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{
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/* Message is too long */
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context->Corrupted = 1;
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}
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}
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if (context->Message_Block_Index == 64)
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{
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SHA1ProcessMessageBlock(context);
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}
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message_array++;
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}
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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 function will process the next 512 bits of the message
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* stored in the Message_Block array.
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*
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* Parameters:
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* None.
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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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*
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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 publication.
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*
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*
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*/
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void SHA1ProcessMessageBlock(SHA1Context *context)
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{
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const unsigned long K[] = { /* Constants defined in SHA-1 */
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0x5A827999,
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0x6ED9EBA1,
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0x8F1BBCDC,
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0xCA62C1D6
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};
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int t; /* Loop counter */
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unsigned long temp; /* Temporary word value */
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unsigned long W[80]; /* Word sequence */
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unsigned long 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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{
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W[t] = context->Message_Block[t * 4 ] << 24;
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W[t] |= context->Message_Block[t * 4 + 1] << 16;
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W[t] |= context->Message_Block[t * 4 + 2] << 8;
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W[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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{
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W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
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}
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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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{
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temp = SHA1CircularShift(5,A) +
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((B & C) | ((~B) & D)) + E + W[t] + K[0];
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E = D;
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D = C;
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C = SHA1CircularShift(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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{
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temp = SHA1CircularShift(5,A) + (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 = SHA1CircularShift(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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{
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temp = SHA1CircularShift(5,A) +
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((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
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E = D;
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D = C;
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C = SHA1CircularShift(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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{
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temp = SHA1CircularShift(5,A) + (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 = SHA1CircularShift(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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* SHA1PadMessage
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*
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* Description:
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* According to the standard, the message must be padded to an even
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* 512 bits. The first padding bit must be a '1'. The last 64
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* bits represent the length of the original message. All bits in
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* between should be 0. This function will pad the message
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* according to those rules by filling the Message_Block array
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* accordingly. It will also call the ProcessMessageBlock function
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* provided appropriately. When it returns, it can be assumed that
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* the 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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* ProcessMessageBlock: [in]
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* The appropriate SHA*ProcessMessageBlock function
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* Returns:
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* Nothing.
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*
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*/
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void SHA1PadMessage(SHA1Context *context)
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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 > 55)
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{
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context->Message_Block[context->Message_Block_Index++] = 0x80;
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while(context->Message_Block_Index < 64)
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{
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context->Message_Block[context->Message_Block_Index++] = 0;
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}
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SHA1ProcessMessageBlock(context);
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while(context->Message_Block_Index < 56)
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{
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context->Message_Block[context->Message_Block_Index++] = 0;
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}
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}
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else
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{
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context->Message_Block[context->Message_Block_Index++] = 0x80;
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while(context->Message_Block_Index < 56)
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{
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context->Message_Block[context->Message_Block_Index++] = 0;
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}
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}
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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] = (unsigned char)(context->Length_High >> 24);
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context->Message_Block[57] = (unsigned char)(context->Length_High >> 16);
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context->Message_Block[58] = (unsigned char)(context->Length_High >> 8);
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context->Message_Block[59] = (unsigned char)(context->Length_High );
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context->Message_Block[60] = (unsigned char)(context->Length_Low >> 24);
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context->Message_Block[61] = (unsigned char)(context->Length_Low >> 16);
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context->Message_Block[62] = (unsigned char)(context->Length_Low >> 8);
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context->Message_Block[63] = (unsigned char)(context->Length_Low );
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SHA1ProcessMessageBlock(context);
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}
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//////////////////////////////////////////////////////////////////////////////
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#if defined( SHA1_TEST )
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#include "string.h"
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char* samplearray[4] =
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{
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"abc",
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"abcdbcdecdefdefgefghfghighijhi" "jkijkljklmklmnlmnomnopnopq",
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"a",
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"01234567012345670123456701234567" "01234567012345670123456701234567"
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};
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char* resultarray[ 4 ] =
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{
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"\xA9\x99\x3E\x36\x47\x06\x81\x6A\xBA\x3E\x25\x71\x78\x50\xC2\x6C\x9C\xD0\xD8\x9D",
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"\x84\x98\x3E\x44\x1C\x3B\xD2\x6E\xBA\xAE\x4A\xA1\xF9\x51\x29\xE5\xE5\x46\x70\xF1",
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"\x34\xAA\x97\x3C\xD4\xC4\xDA\xA4\xF6\x1E\xEB\x2B\xDB\xAD\x27\x31\x65\x34\x01\x6F",
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"\xDE\xA3\x56\xA2\xCD\xDD\x90\xC7\xA7\xEC\xED\xC5\xEB\xB5\x63\x93\x4F\x46\x04\x52"
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};
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long int repeatcount[4] = { 1, 1, 1000000, 10 };
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int SHA1Test( )
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{
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SHA1Context sha;
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unsigned char digest[20];
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int i, j, error;
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error = 0;
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for ( j = 0; j < 4; ++j )
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{
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if ( !error )
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error = SHA1Reset(&sha);
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for(i = 0; i < repeatcount[j]; ++i)
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{
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if ( !error )
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error = SHA1Input(&sha,
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(const unsigned char *)samplearray[j],
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(unsigned int)strlen(samplearray[j]));
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}
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if ( !error )
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error = SHA1Result(&sha, digest);
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if ( !error )
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error = memcmp( digest, resultarray[j], 20 );
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if (error)
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break;
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}
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return error ? 0 : 1;
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}
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#endif // SHA1_TEST
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//////////////////////////////////////////////////////////////////////////////
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