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/* | ||
* sha1.c | ||
* | ||
* Copyright (C) 1998, 2009 | ||
* Paul E. Jones <paulej@packetizer.com> | ||
* All Rights Reserved | ||
* | ||
***************************************************************************** | ||
* $Id: sha1.c 12 2009-06-22 19:34:25Z paulej $ | ||
***************************************************************************** | ||
* | ||
* Description: | ||
* This file implements the Secure Hashing Standard as defined | ||
* in FIPS PUB 180-1 published April 17, 1995. | ||
* | ||
* The Secure Hashing Standard, which uses the Secure Hashing | ||
* Algorithm (SHA), produces a 160-bit message digest for a | ||
* given data stream. In theory, it is highly improbable that | ||
* two messages will produce the same message digest. 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 was | ||
* written with the expectation that the processor has at least | ||
* a 32-bit machine word size. If the machine word size is larger, | ||
* the code should still function properly. One caveat to that | ||
* is that the input functions taking characters and character | ||
* arrays assume that only 8 bits of information are stored in each | ||
* character. | ||
* | ||
* 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. | ||
* | ||
*/ | ||
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#include "sha1.h" | ||
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/* | ||
* Define the circular shift macro | ||
*/ | ||
#define SHA1CircularShift(bits,word) \ | ||
((((word) << (bits)) & 0xFFFFFFFF) | \ | ||
((word) >> (32-(bits)))) | ||
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/* Function prototypes */ | ||
void SHA1ProcessMessageBlock(SHA1Context *); | ||
void SHA1PadMessage(SHA1Context *); | ||
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/* | ||
* SHA1Reset | ||
* | ||
* Description: | ||
* This function will initialize the SHA1Context in preparation | ||
* for computing a new message digest. | ||
* | ||
* Parameters: | ||
* context: [in/out] | ||
* The context to reset. | ||
* | ||
* Returns: | ||
* Nothing. | ||
* | ||
* Comments: | ||
* | ||
*/ | ||
void SHA1Reset(SHA1Context *context) | ||
{ | ||
context->Length_Low = 0; | ||
context->Length_High = 0; | ||
context->Message_Block_Index = 0; | ||
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context->Message_Digest[0] = 0x67452301; | ||
context->Message_Digest[1] = 0xEFCDAB89; | ||
context->Message_Digest[2] = 0x98BADCFE; | ||
context->Message_Digest[3] = 0x10325476; | ||
context->Message_Digest[4] = 0xC3D2E1F0; | ||
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context->Computed = 0; | ||
context->Corrupted = 0; | ||
} | ||
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/* | ||
* SHA1Result | ||
* | ||
* Description: | ||
* This function will return the 160-bit message digest into the | ||
* Message_Digest array within the SHA1Context provided | ||
* | ||
* Parameters: | ||
* context: [in/out] | ||
* The context to use to calculate the SHA-1 hash. | ||
* | ||
* Returns: | ||
* 1 if successful, 0 if it failed. | ||
* | ||
* Comments: | ||
* | ||
*/ | ||
int SHA1Result(SHA1Context *context) | ||
{ | ||
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if (context->Corrupted) | ||
{ | ||
return 0; | ||
} | ||
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if (!context->Computed) | ||
{ | ||
SHA1PadMessage(context); | ||
context->Computed = 1; | ||
} | ||
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return 1; | ||
} | ||
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/* | ||
* SHA1Input | ||
* | ||
* Description: | ||
* This function accepts an array of octets as the next portion of | ||
* the message. | ||
* | ||
* Parameters: | ||
* context: [in/out] | ||
* The SHA-1 context to update | ||
* message_array: [in] | ||
* An array of characters representing the next portion of the | ||
* message. | ||
* length: [in] | ||
* The length of the message in message_array | ||
* | ||
* Returns: | ||
* Nothing. | ||
* | ||
* Comments: | ||
* | ||
*/ | ||
void SHA1Input( SHA1Context *context, | ||
const unsigned char *message_array, | ||
unsigned length) | ||
{ | ||
if (!length) | ||
{ | ||
return; | ||
} | ||
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if (context->Computed || context->Corrupted) | ||
{ | ||
context->Corrupted = 1; | ||
return; | ||
} | ||
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while(length-- && !context->Corrupted) | ||
{ | ||
context->Message_Block[context->Message_Block_Index++] = | ||
(*message_array & 0xFF); | ||
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context->Length_Low += 8; | ||
/* Force it to 32 bits */ | ||
context->Length_Low &= 0xFFFFFFFF; | ||
if (context->Length_Low == 0) | ||
{ | ||
context->Length_High++; | ||
/* Force it to 32 bits */ | ||
context->Length_High &= 0xFFFFFFFF; | ||
if (context->Length_High == 0) | ||
{ | ||
/* Message is too long */ | ||
context->Corrupted = 1; | ||
} | ||
} | ||
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if (context->Message_Block_Index == 64) | ||
{ | ||
SHA1ProcessMessageBlock(context); | ||
} | ||
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message_array++; | ||
} | ||
} | ||
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/* | ||
* SHA1ProcessMessageBlock | ||
* | ||
* Description: | ||
* This function will process the next 512 bits of the message | ||
* stored in the Message_Block array. | ||
* | ||
* Parameters: | ||
* None. | ||
* | ||
* Returns: | ||
* Nothing. | ||
* | ||
* Comments: | ||
* Many of the variable names in the SHAContext, especially the | ||
* single character names, were used because those were the names | ||
* used in the publication. | ||
* | ||
* | ||
*/ | ||
void SHA1ProcessMessageBlock(SHA1Context *context) | ||
{ | ||
const unsigned K[] = /* Constants defined in SHA-1 */ | ||
{ | ||
0x5A827999, | ||
0x6ED9EBA1, | ||
0x8F1BBCDC, | ||
0xCA62C1D6 | ||
}; | ||
int t; /* Loop counter */ | ||
unsigned temp; /* Temporary word value */ | ||
unsigned W[80]; /* Word sequence */ | ||
unsigned A, B, C, D, E; /* Word buffers */ | ||
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/* | ||
* Initialize the first 16 words in the array W | ||
*/ | ||
for(t = 0; t < 16; t++) | ||
{ | ||
W[t] = ((unsigned) context->Message_Block[t * 4]) << 24; | ||
W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16; | ||
W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8; | ||
W[t] |= ((unsigned) context->Message_Block[t * 4 + 3]); | ||
} | ||
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for(t = 16; t < 80; t++) | ||
{ | ||
W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); | ||
} | ||
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A = context->Message_Digest[0]; | ||
B = context->Message_Digest[1]; | ||
C = context->Message_Digest[2]; | ||
D = context->Message_Digest[3]; | ||
E = context->Message_Digest[4]; | ||
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for(t = 0; t < 20; t++) | ||
{ | ||
temp = SHA1CircularShift(5,A) + | ||
((B & C) | ((~B) & D)) + E + W[t] + K[0]; | ||
temp &= 0xFFFFFFFF; | ||
E = D; | ||
D = C; | ||
C = SHA1CircularShift(30,B); | ||
B = A; | ||
A = temp; | ||
} | ||
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for(t = 20; t < 40; t++) | ||
{ | ||
temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1]; | ||
temp &= 0xFFFFFFFF; | ||
E = D; | ||
D = C; | ||
C = SHA1CircularShift(30,B); | ||
B = A; | ||
A = temp; | ||
} | ||
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for(t = 40; t < 60; t++) | ||
{ | ||
temp = SHA1CircularShift(5,A) + | ||
((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; | ||
temp &= 0xFFFFFFFF; | ||
E = D; | ||
D = C; | ||
C = SHA1CircularShift(30,B); | ||
B = A; | ||
A = temp; | ||
} | ||
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for(t = 60; t < 80; t++) | ||
{ | ||
temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3]; | ||
temp &= 0xFFFFFFFF; | ||
E = D; | ||
D = C; | ||
C = SHA1CircularShift(30,B); | ||
B = A; | ||
A = temp; | ||
} | ||
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context->Message_Digest[0] = | ||
(context->Message_Digest[0] + A) & 0xFFFFFFFF; | ||
context->Message_Digest[1] = | ||
(context->Message_Digest[1] + B) & 0xFFFFFFFF; | ||
context->Message_Digest[2] = | ||
(context->Message_Digest[2] + C) & 0xFFFFFFFF; | ||
context->Message_Digest[3] = | ||
(context->Message_Digest[3] + D) & 0xFFFFFFFF; | ||
context->Message_Digest[4] = | ||
(context->Message_Digest[4] + E) & 0xFFFFFFFF; | ||
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context->Message_Block_Index = 0; | ||
} | ||
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/* | ||
* SHA1PadMessage | ||
* | ||
* 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 SHA1ProcessMessageBlock() | ||
* appropriately. When it returns, it can be assumed that the | ||
* message digest has been computed. | ||
* | ||
* Parameters: | ||
* context: [in/out] | ||
* The context to pad | ||
* | ||
* Returns: | ||
* Nothing. | ||
* | ||
* Comments: | ||
* | ||
*/ | ||
void SHA1PadMessage(SHA1Context *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. | ||
*/ | ||
if (context->Message_Block_Index > 55) | ||
{ | ||
context->Message_Block[context->Message_Block_Index++] = 0x80; | ||
while(context->Message_Block_Index < 64) | ||
{ | ||
context->Message_Block[context->Message_Block_Index++] = 0; | ||
} | ||
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SHA1ProcessMessageBlock(context); | ||
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while(context->Message_Block_Index < 56) | ||
{ | ||
context->Message_Block[context->Message_Block_Index++] = 0; | ||
} | ||
} | ||
else | ||
{ | ||
context->Message_Block[context->Message_Block_Index++] = 0x80; | ||
while(context->Message_Block_Index < 56) | ||
{ | ||
context->Message_Block[context->Message_Block_Index++] = 0; | ||
} | ||
} | ||
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/* | ||
* Store the message length as the last 8 octets | ||
*/ | ||
context->Message_Block[56] = (context->Length_High >> 24) & 0xFF; | ||
context->Message_Block[57] = (context->Length_High >> 16) & 0xFF; | ||
context->Message_Block[58] = (context->Length_High >> 8) & 0xFF; | ||
context->Message_Block[59] = (context->Length_High) & 0xFF; | ||
context->Message_Block[60] = (context->Length_Low >> 24) & 0xFF; | ||
context->Message_Block[61] = (context->Length_Low >> 16) & 0xFF; | ||
context->Message_Block[62] = (context->Length_Low >> 8) & 0xFF; | ||
context->Message_Block[63] = (context->Length_Low) & 0xFF; | ||
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SHA1ProcessMessageBlock(context); | ||
} |
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