![rizzo](/assets/img/avatar_default.png)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@89473 f38db490-d61c-443f-a65b-d21fe96a405b
338 lines
10 KiB
C
338 lines
10 KiB
C
/*! \file
|
|
*
|
|
* \brief Based on the RFC 3174
|
|
*
|
|
* Full Copyright Statement
|
|
*
|
|
* Copyright (C) The Internet Society (2001). All Rights Reserved.
|
|
*
|
|
* This document and translations of it may be copied and furnished to
|
|
* others, and derivative works that comment on or otherwise explain it
|
|
* or assist in its implementation may be prepared, copied, published
|
|
* and distributed, in whole or in part, without restriction of any
|
|
* kind, provided that the above copyright notice and this paragraph are
|
|
* included on all such copies and derivative works. However, this
|
|
* document itself may not be modified in any way, such as by removing
|
|
* the copyright notice or references to the Internet Society or other
|
|
* Internet organizations, except as needed for the purpose of
|
|
* developing Internet standards in which case the procedures for
|
|
* copyrights defined in the Internet Standards process must be
|
|
* followed, or as required to translate it into languages other than
|
|
* English.
|
|
*
|
|
* The limited permissions granted above are perpetual and will not be
|
|
* revoked by the Internet Society or its successors or assigns.
|
|
|
|
* This document and the information contained herein is provided on an
|
|
* "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
|
|
* TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
|
|
* BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
|
|
* HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
*
|
|
*
|
|
* 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 <stdint.h> (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.
|
|
*
|
|
*/
|
|
|
|
#include "asterisk.h"
|
|
#include "asterisk/sha1.h"
|
|
|
|
/*! Define the SHA1 circular left shift macro */
|
|
#define SHA1CircularShift(bits,word) \
|
|
(((word) << (bits)) | ((word) >> (32-(bits))))
|
|
|
|
/* Local Function Prototyptes */
|
|
void SHA1PadMessage(SHA1Context *);
|
|
void SHA1ProcessMessageBlock(SHA1Context *);
|
|
|
|
/*!
|
|
* \brief SHA1Reset
|
|
* \param context the context to be reset.
|
|
* This function will initialize the SHA1Context in preparation
|
|
* for computing a new SHA1 message digest.
|
|
* \return sha Error Code.
|
|
*/
|
|
int SHA1Reset(SHA1Context *context)
|
|
{
|
|
if (!context) {
|
|
return shaNull;
|
|
}
|
|
|
|
context->Length_Low = 0;
|
|
context->Length_High = 0;
|
|
context->Message_Block_Index = 0;
|
|
|
|
context->Intermediate_Hash[0] = 0x67452301;
|
|
context->Intermediate_Hash[1] = 0xEFCDAB89;
|
|
context->Intermediate_Hash[2] = 0x98BADCFE;
|
|
context->Intermediate_Hash[3] = 0x10325476;
|
|
context->Intermediate_Hash[4] = 0xC3D2E1F0;
|
|
|
|
context->Computed = 0;
|
|
context->Corrupted = 0;
|
|
|
|
return shaSuccess;
|
|
}
|
|
|
|
/*!
|
|
* \brief SHA1Result
|
|
* \param context [in/out] The context to use to calculate the SHA-1 hash.
|
|
* \param Message_Digest [out] Where the digest is returned.
|
|
* This function will return the 160-bit message digest into the
|
|
* Message_Digest array provided by the caller.
|
|
* \note The first octet of hash is stored in the 0th element,
|
|
* the last octet of hash in the 19th element.
|
|
* \return sha Error Code.
|
|
*/
|
|
int SHA1Result( SHA1Context *context,
|
|
uint8_t Message_Digest[SHA1HashSize])
|
|
{
|
|
int i;
|
|
|
|
if (!context || !Message_Digest) {
|
|
return shaNull;
|
|
}
|
|
|
|
if (context->Corrupted) {
|
|
return context->Corrupted;
|
|
}
|
|
|
|
if (!context->Computed) {
|
|
SHA1PadMessage(context);
|
|
for (i = 0; i < 64; ++i) {
|
|
/* message may be sensitive, clear it out */
|
|
context->Message_Block[i] = 0;
|
|
}
|
|
context->Length_Low = 0; /* and clear length */
|
|
context->Length_High = 0;
|
|
context->Computed = 1;
|
|
}
|
|
|
|
for (i = 0; i < SHA1HashSize; ++i) {
|
|
Message_Digest[i] = context->Intermediate_Hash[i >> 2] >> 8 * ( 3 - ( i & 0x03 ) );
|
|
}
|
|
|
|
return shaSuccess;
|
|
}
|
|
|
|
/*!
|
|
* \brief SHA1Input
|
|
* \param context [in/out] The SHA context to update
|
|
* \param message_array [in] An array of characters representing the next portion of
|
|
* the message.
|
|
* \param length [in] The length of the message in message_array.
|
|
* This function accepts an array of octets as the next portion
|
|
* of the message.
|
|
* \return sha Error Code.
|
|
*/
|
|
int SHA1Input(SHA1Context *context, const uint8_t *message_array, unsigned length)
|
|
{
|
|
if (!length) {
|
|
return shaSuccess;
|
|
}
|
|
|
|
if (!context || !message_array) {
|
|
return shaNull;
|
|
}
|
|
|
|
if (context->Computed) {
|
|
context->Corrupted = shaStateError;
|
|
return shaStateError;
|
|
}
|
|
|
|
if (context->Corrupted) {
|
|
return context->Corrupted;
|
|
}
|
|
|
|
while (length-- && !context->Corrupted) {
|
|
context->Message_Block[context->Message_Block_Index++] = (*message_array & 0xFF);
|
|
|
|
context->Length_Low += 8;
|
|
if (context->Length_Low == 0) {
|
|
context->Length_High++;
|
|
if (context->Length_High == 0) {
|
|
/* Message is too long */
|
|
context->Corrupted = 1;
|
|
}
|
|
}
|
|
|
|
if (context->Message_Block_Index == 64) {
|
|
SHA1ProcessMessageBlock(context);
|
|
}
|
|
|
|
message_array++;
|
|
}
|
|
|
|
return shaSuccess;
|
|
}
|
|
|
|
/*!
|
|
* \brief Process the next 512 bits of the message stored in the Message_Block array.
|
|
* \param context [in/out] The SHA context to update
|
|
* \note Many of the variable names in this code, especially the
|
|
* single character names, were used because those were the
|
|
* names used in the publication.
|
|
* \returns nothing.
|
|
*/
|
|
void SHA1ProcessMessageBlock(SHA1Context *context)
|
|
{
|
|
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] = context->Message_Block[t * 4] << 24;
|
|
W[t] |= context->Message_Block[t * 4 + 1] << 16;
|
|
W[t] |= context->Message_Block[t * 4 + 2] << 8;
|
|
W[t] |= context->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 = 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;
|
|
}
|
|
|
|
|
|
/*!
|
|
* \brief Pad message to be 512 bits.
|
|
* \param context [in/out] The context to pad.
|
|
*
|
|
* 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.
|
|
*
|
|
* \returns nothing.
|
|
*/
|
|
|
|
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;
|
|
}
|
|
|
|
SHA1ProcessMessageBlock(context);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Store the message length as the last 8 octets
|
|
*/
|
|
context->Message_Block[56] = context->Length_High >> 24;
|
|
context->Message_Block[57] = context->Length_High >> 16;
|
|
context->Message_Block[58] = context->Length_High >> 8;
|
|
context->Message_Block[59] = context->Length_High;
|
|
context->Message_Block[60] = context->Length_Low >> 24;
|
|
context->Message_Block[61] = context->Length_Low >> 16;
|
|
context->Message_Block[62] = context->Length_Low >> 8;
|
|
context->Message_Block[63] = context->Length_Low;
|
|
|
|
SHA1ProcessMessageBlock(context);
|
|
}
|