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callback.c
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callback.c
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/*
* File: callback.c
* Author: DoI
*
* This file defines a set of callback methods that can be used
* to perform custom actions prior to, or after, sending a test
* case. Relies on an -O3 compiler optimization to prune out the
* calls if there is nothing defined in these methods.
*/
#include <stdlib.h>
#include <stdint.h>
#include <ctype.h>
#include <endian.h>
#include <stddef.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#define SHA256 SSLSHA256
#include <openssl/ssl.h>
#undef SHA256
#include "generator.h"
#define USER "administrator"
#define PASSWORD "aaptel-42"
#define UNC_PATH1 "\\\\192.168.2.110\\scratch"
#define UNC_PATH2 "\\\\192.168.2.110\\IPC$"
/*
############################################################################
## SHA routines ##
############################################################################
*/
/**************************** sha.h ****************************/
/******************* See RFC 4634 for details ******************/
#ifndef _SHA_H_
#define _SHA_H_
#ifndef USE_SHA1
#define USE_SHA1 0
#endif
#ifndef USE_SHA224
#define USE_SHA224 0
#endif
#ifndef USE_SHA384_SHA512
#define USE_SHA384_SHA512 0
#endif
/*
* Description:
* This file implements the Secure Hash Signature Standard
* algorithms as defined in the National Institute of Standards
* and Technology Federal Information Processing Standards
* Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
* published on August 1, 2002, and the FIPS PUB 180-2 Change
* Notice published on February 28, 2004.
*
* A combined document showing all algorithms is available at
* http://csrc.nist.gov/publications/fips/
* fips180-2/fips180-2withchangenotice.pdf
*
* The five hashes are defined in these sizes:
* SHA-1 20 byte / 160 bit
* SHA-224 28 byte / 224 bit
* SHA-256 32 byte / 256 bit
* SHA-384 48 byte / 384 bit
* SHA-512 64 byte / 512 bit
*/
/*
* If you do not have the ISO standard stdint.h header file, then you
* must typedef the following:
* name meaning
* uint64_t unsigned 64 bit integer
* uint32_t unsigned 32 bit integer
* uint8_t unsigned 8 bit integer (i.e., unsigned char)
* int_least16_t integer of >= 16 bits
*
*/
#ifndef _SHA_enum_
#define _SHA_enum_
/*
* All SHA functions return one of these values.
*/
enum
{
shaSuccess = 0,
shaNull, /* Null pointer parameter */
shaInputTooLong, /* input data too long */
shaStateError, /* called Input after FinalBits or Result */
shaBadParam /* passed a bad parameter */
};
#endif /* _SHA_enum_ */
/*
* These constants hold size information for each of the SHA
* hashing operations
*/
enum
{
#if defined(USE_SHA1) && USE_SHA1
SHA1_Message_Block_Size = 64,
SHA1HashSize = 20,
SHA1HashSizeBits = 160,
#endif
#if defined(USE_SHA224) && USE_SHA224
SHA224_Message_Block_Size = 64,
SHA224HashSize = 28,
SHA224HashSizeBits = 224,
#endif
#if defined(USE_SHA384_SHA512) && USE_SHA384_SHA512
SHA384_Message_Block_Size = 128,
SHA384HashSize = 48,
SHA384HashSizeBits = 384,
#endif
SHA256_Message_Block_Size = 64,
SHA512_Message_Block_Size = 128,
USHA_Max_Message_Block_Size = SHA512_Message_Block_Size,
SHA256HashSize = 32,
SHA512HashSize = 64,
USHAMaxHashSize = SHA512HashSize,
SHA256HashSizeBits = 256,
SHA512HashSizeBits = 512, USHAMaxHashSizeBits = SHA512HashSizeBits
};
/*
* These constants are used in the USHA (unified sha) functions.
*/
typedef enum SHAversion
{
#if defined(USE_SHA1) && USE_SHA1
SHA1,
#endif
#if defined(USE_SHA224) && USE_SHA224
SHA224,
#endif
#if defined(USE_SHA384_SHA512) && USE_SHA384_SHA512
SHA384,
SHA512,
#endif
SHA256
} SHAversion;
#if defined(USE_SHA1) && USE_SHA1
/*
* This structure will hold context information for the SHA-1
* hashing operation.
*/
typedef struct SHA1Context
{
uint32_t Intermediate_Hash[SHA1HashSize / 4]; /* Message Digest */
uint32_t Length_Low; /* Message length in bits */
uint32_t Length_High; /* Message length in bits */
int_least16_t Message_Block_Index; /* Message_Block array index */
/* 512-bit message blocks */
uint8_t Message_Block[SHA1_Message_Block_Size];
int Computed; /* Is the digest computed? */
int Corrupted; /* Is the digest corrupted? */
} SHA1Context;
#endif
/*
* This structure will hold context information for the SHA-256
* hashing operation.
*/
typedef struct SHA256Context
{
uint32_t Intermediate_Hash[SHA256HashSize / 4]; /* Message Digest */
uint32_t Length_Low; /* Message length in bits */
uint32_t Length_High; /* Message length in bits */
int_least16_t Message_Block_Index; /* Message_Block array index */
/* 512-bit message blocks */
uint8_t Message_Block[SHA256_Message_Block_Size];
int Computed; /* Is the digest computed? */
int Corrupted; /* Is the digest corrupted? */
} SHA256Context;
/*
* This structure will hold context information for the SHA-512
* hashing operation.
*/
typedef struct SHA512Context
{
#ifdef USE_32BIT_ONLY
uint32_t Intermediate_Hash[SHA512HashSize / 4]; /* Message Digest */
uint32_t Length[4]; /* Message length in bits */
#else /* !USE_32BIT_ONLY */
uint64_t Intermediate_Hash[SHA512HashSize / 8]; /* Message Digest */
uint64_t Length_Low, Length_High; /* Message length in bits */
#endif /* USE_32BIT_ONLY */
int_least16_t Message_Block_Index; /* Message_Block array index */
/* 1024-bit message blocks */
uint8_t Message_Block[SHA512_Message_Block_Size];
int Computed; /* Is the digest computed? */
int Corrupted; /* Is the digest corrupted? */
} SHA512Context;
#if defined(USE_SHA224) && USE_SHA224
/*
* This structure will hold context information for the SHA-224
* hashing operation. It uses the SHA-256 structure for computation.
*/
typedef struct SHA256Context SHA224Context;
#endif
#if defined(USE_SHA384_SHA512) && USE_SHA384_SHA512
/*
* This structure will hold context information for the SHA-384
* hashing operation. It uses the SHA-512 structure for computation.
*/
typedef struct SHA512Context SHA384Context;
#endif
/*
* This structure holds context information for all SHA
* hashing operations.
*/
typedef struct USHAContext
{
int whichSha; /* which SHA is being used */
union
{
#if defined(USE_SHA1) && USE_SHA1
SHA1Context sha1Context;
#endif
#if defined(USE_SHA224) && USE_SHA224
SHA224Context sha224Context;
#endif
SHA256Context sha256Context;
#if defined(USE_SHA384_SHA512) && USE_SHA384_SHA512
SHA384Context sha384Context;
SHA512Context sha512Context;
#endif
} ctx;
} USHAContext;
/*
* This structure will hold context information for the HMAC
* keyed hashing operation.
*/
typedef struct HMACContext
{
int whichSha; /* which SHA is being used */
int hashSize; /* hash size of SHA being used */
int blockSize; /* block size of SHA being used */
USHAContext shaContext; /* SHA context */
unsigned char k_opad[USHA_Max_Message_Block_Size];
/* outer padding - key XORd with opad */
} HMACContext;
/*
* Function Prototypes
*/
#if defined(USE_SHA1) && USE_SHA1
/* SHA-1 */
extern int SHA1Reset (SHA1Context *);
extern int SHA1Input (SHA1Context *, const uint8_t * bytes,
unsigned int bytecount);
extern int SHA1FinalBits (SHA1Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA1Result (SHA1Context *, uint8_t Message_Digest[SHA1HashSize]);
#endif
#if defined(USE_SHA224) && USE_SHA224
/* SHA-224 */
extern int SHA224Reset (SHA224Context *);
extern int SHA224Input (SHA224Context *, const uint8_t * bytes,
unsigned int bytecount);
extern int SHA224FinalBits (SHA224Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA224Result (SHA224Context *,
uint8_t Message_Digest[SHA224HashSize]);
#endif
/* SHA-256 */
extern int SHA256Reset (SHA256Context *);
extern int SHA256Input (SHA256Context *, const uint8_t * bytes,
unsigned int bytecount);
extern int SHA256FinalBits (SHA256Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA256Result (SHA256Context *,
uint8_t Message_Digest[SHA256HashSize]);
#if defined(USE_SHA384_SHA512) && USE_SHA384_SHA512
/* SHA-384 */
extern int SHA384Reset (SHA384Context *);
extern int SHA384Input (SHA384Context *, const uint8_t * bytes,
unsigned int bytecount);
extern int SHA384FinalBits (SHA384Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA384Result (SHA384Context *,
uint8_t Message_Digest[SHA384HashSize]);
/* SHA-512 */
extern int SHA512Reset (SHA512Context *);
extern int SHA512Input (SHA512Context *, const uint8_t * bytes,
unsigned int bytecount);
extern int SHA512FinalBits (SHA512Context *, const uint8_t bits,
unsigned int bitcount);
extern int SHA512Result (SHA512Context *,
uint8_t Message_Digest[SHA512HashSize]);
#endif
/* Unified SHA functions, chosen by whichSha */
extern int USHAReset (USHAContext *, SHAversion whichSha);
extern int USHAInput (USHAContext *,
const uint8_t * bytes, unsigned int bytecount);
extern int USHAFinalBits (USHAContext *,
const uint8_t bits, unsigned int bitcount);
extern int USHAResult (USHAContext *,
uint8_t Message_Digest[USHAMaxHashSize]);
extern int USHABlockSize (enum SHAversion whichSha);
extern int USHAHashSize (enum SHAversion whichSha);
extern int USHAHashSizeBits (enum SHAversion whichSha);
/*
* HMAC Keyed-Hashing for Message Authentication, RFC2104,
* for all SHAs.
* This interface allows a fixed-length text input to be used.
*/
extern int hmac (SHAversion whichSha, /* which SHA algorithm to use */
const unsigned char *text, /* pointer to data stream */
int text_len, /* length of data stream */
const unsigned char *key, /* pointer to authentication key */
int key_len, /* length of authentication key */
uint8_t digest[USHAMaxHashSize]); /* caller digest to fill in */
/*
* HMAC Keyed-Hashing for Message Authentication, RFC2104,
* for all SHAs.
* This interface allows any length of text input to be used.
*/
extern int hmacReset (HMACContext * ctx, enum SHAversion whichSha,
const unsigned char *key, int key_len);
extern int hmacInput (HMACContext * ctx, const unsigned char *text,
int text_len);
extern int hmacFinalBits (HMACContext * ctx, const uint8_t bits,
unsigned int bitcount);
extern int hmacResult (HMACContext * ctx, uint8_t digest[USHAMaxHashSize]);
#endif /* _SHA_H_ */
/*************************** sha224-256.c ***************************/
/********************* See RFC 4634 for details *********************/
/*
* Description:
* This file implements the Secure Hash Signature Standard
* algorithms as defined in the National Institute of Standards
* and Technology Federal Information Processing Standards
* Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
* published on August 1, 2002, and the FIPS PUB 180-2 Change
* Notice published on February 28, 2004.
*
* A combined document showing all algorithms is available at
* http://csrc.nist.gov/publications/fips/
* fips180-2/fips180-2withchangenotice.pdf
*
* The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
* message digests 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-224 and SHA-256 are defined in terms of 32-bit "words".
* This code uses <stdint.h> (included via "sha.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-224 and SHA-256 are designed to work with messages less
* than 2^64 bits long. This implementation uses SHA224/256Input()
* to hash the bits that are a multiple of the size of an 8-bit
* character, and then uses SHA224/256FinalBits() to hash the
* final few bits of the input.
*/
/*
* These definitions are defined in FIPS-180-2, section 4.1.
* Ch() and Maj() are defined identically in sections 4.1.1,
* 4.1.2 and 4.1.3.
*
* The definitions used in FIPS-180-2 are as follows:
*/
#ifndef USE_MODIFIED_MACROS
#define SHA_Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
#define SHA_Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#else /* USE_MODIFIED_MACROS */
/*
* The following definitions are equivalent and potentially faster.
*/
#define SHA_Ch(x, y, z) (((x) & ((y) ^ (z))) ^ (z))
#define SHA_Maj(x, y, z) (((x) & ((y) | (z))) | ((y) & (z)))
#endif /* USE_MODIFIED_MACROS */
#define SHA_Parity(x, y, z) ((x) ^ (y) ^ (z))
/* Define the SHA shift, rotate left and rotate right macro */
#define SHA256_SHR(bits,word) ((word) >> (bits))
#define SHA256_ROTL(bits,word) \
(((word) << (bits)) | ((word) >> (32-(bits))))
#define SHA256_ROTR(bits,word) \
(((word) >> (bits)) | ((word) << (32-(bits))))
/* Define the SHA SIGMA and sigma macros */
#define SHA256_SIGMA0(word) \
(SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word))
#define SHA256_SIGMA1(word) \
(SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word))
#define SHA256_sigma0(word) \
(SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word))
#define SHA256_sigma1(word) \
(SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word))
/*
* add "length" to the length
*/
static uint32_t addTemp;
#define SHA224_256AddLength(context, length) \
(addTemp = (context)->Length_Low, (context)->Corrupted = \
(((context)->Length_Low += (length)) < addTemp) && \
(++(context)->Length_High == 0) ? 1 : 0)
/* Local Function Prototypes */
static void SHA224_256Finalize (SHA256Context * context, uint8_t Pad_Byte);
static void SHA224_256PadMessage (SHA256Context * context, uint8_t Pad_Byte);
static void SHA224_256ProcessMessageBlock (SHA256Context * context);
static int SHA224_256Reset (SHA256Context * context, uint32_t * H0);
static int SHA224_256ResultN (SHA256Context * context,
uint8_t Message_Digest[], int HashSize);
/* Initial Hash Values: FIPS-180-2 section 5.3.2 */
static uint32_t SHA256_H0[SHA256HashSize / 4] = {
0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
};
#if defined(USE_SHA224) && USE_SHA224
/* Initial Hash Values: FIPS-180-2 Change Notice 1 */
static uint32_t SHA224_H0[SHA256HashSize / 4] = {
0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939,
0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4
};
/*
* SHA224Reset
*
* Description:
* This function will initialize the SHA384Context in preparation
* for computing a new SHA224 message digest.
*
* Parameters:
* context: [in/out]
* The context to reset.
*
* Returns:
* sha Error Code.
*/
int
SHA224Reset (SHA224Context * context)
{
return SHA224_256Reset (context, SHA224_H0);
}
/*
* SHA224Input
*
* Description:
* This function accepts an array of octets as the next portion
* of the message.
*
* Parameters:
* context: [in/out]
* The SHA 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:
* sha Error Code.
*
*/
int
SHA224Input (SHA224Context * context, const uint8_t * message_array,
unsigned int length)
{
return SHA256Input (context, message_array, length);
}
/*
* SHA224FinalBits
*
* Description:
* This function will add in any final bits of the message.
*
* Parameters:
* context: [in/out]
* The SHA context to update
* message_bits: [in]
* The final bits of the message, in the upper portion of the
* byte. (Use 0b###00000 instead of 0b00000### to input the
* three bits ###.)
* length: [in]
* The number of bits in message_bits, between 1 and 7.
*
* Returns:
* sha Error Code.
*/
int
SHA224FinalBits (SHA224Context * context,
const uint8_t message_bits, unsigned int length)
{
return SHA256FinalBits (context, message_bits, length);
}
/*
* SHA224Result
*
* Description:
* This function will return the 224-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 28th element.
*
* Parameters:
* context: [in/out]
* The context to use to calculate the SHA hash.
* Message_Digest: [out]
* Where the digest is returned.
*
* Returns:
* sha Error Code.
*/
int
SHA224Result (SHA224Context * context, uint8_t Message_Digest[SHA224HashSize])
{
return SHA224_256ResultN (context, Message_Digest, SHA224HashSize);
}
#endif /* defined(USE_SHA224) && USE_SHA224 */
/*
* SHA256Reset
*
* Description:
* This function will initialize the SHA256Context in preparation
* for computing a new SHA256 message digest.
*
* Parameters:
* context: [in/out]
* The context to reset.
*
* Returns:
* sha Error Code.
*/
int
SHA256Reset (SHA256Context * context)
{
return SHA224_256Reset (context, SHA256_H0);
}
/*
* SHA256Input
*
* Description:
* This function accepts an array of octets as the next portion
* of the message.
*
* Parameters:
* context: [in/out]
* The SHA 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:
* sha Error Code.
*/
int
SHA256Input (SHA256Context * context, const uint8_t * message_array,
unsigned int 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);
if (!SHA224_256AddLength (context, 8) &&
(context->Message_Block_Index == SHA256_Message_Block_Size))
SHA224_256ProcessMessageBlock (context);
message_array++;
}
return shaSuccess;
}
/*
* SHA256FinalBits
*
* Description:
* This function will add in any final bits of the message.
*
* Parameters:
* context: [in/out]
* The SHA context to update
* message_bits: [in]
* The final bits of the message, in the upper portion of the
* byte. (Use 0b###00000 instead of 0b00000### to input the
* three bits ###.)
* length: [in]
* The number of bits in message_bits, between 1 and 7.
*
* Returns:
* sha Error Code.
*/
int
SHA256FinalBits (SHA256Context * context,
const uint8_t message_bits, unsigned int length)
{
uint8_t masks[8] = {
/* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
/* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
/* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
/* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
};
uint8_t markbit[8] = {
/* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
/* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
/* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
/* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
};
if (!length)
return shaSuccess;
if (!context)
return shaNull;
if ((context->Computed) || (length >= 8) || (length == 0))
{
context->Corrupted = shaStateError;
return shaStateError;
}
if (context->Corrupted)
return context->Corrupted;
SHA224_256AddLength (context, length);
SHA224_256Finalize (context, (uint8_t)
((message_bits & masks[length]) | markbit[length]));
return shaSuccess;
}
/*
* SHA256Result
*
* Description:
* This function will return the 256-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 32nd element.
*
* Parameters:
* context: [in/out]
* The context to use to calculate the SHA hash.
* Message_Digest: [out]
* Where the digest is returned.
*
* Returns:
* sha Error Code.
*/
int
SHA256Result (SHA256Context * context, uint8_t Message_Digest[])
{
return SHA224_256ResultN (context, Message_Digest, SHA256HashSize);
}
/*
* SHA224_256Finalize
*
* Description:
* This helper function finishes off the digest calculations.
*
* Parameters:
* context: [in/out]
* The SHA context to update
* Pad_Byte: [in]
* The last byte to add to the digest before the 0-padding
* and length. This will contain the last bits of the message
* followed by another single bit. If the message was an
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
*
* Returns:
* sha Error Code.
*/
static void
SHA224_256Finalize (SHA256Context * context, uint8_t Pad_Byte)
{
int i;
SHA224_256PadMessage (context, Pad_Byte);
/* message may be sensitive, so clear it out */
for (i = 0; i < SHA256_Message_Block_Size; ++i)
context->Message_Block[i] = 0;
context->Length_Low = 0; /* and clear length */
context->Length_High = 0;
context->Computed = 1;
}
/*
* SHA224_256PadMessage
*
* 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 helper function will pad
* the message according to those rules by filling the
* Message_Block array accordingly. When it returns, it can be
* assumed that the message digest has been computed.
*
* Parameters:
* context: [in/out]
* The context to pad
* Pad_Byte: [in]
* The last byte to add to the digest before the 0-padding
* and length. This will contain the last bits of the message
* followed by another single bit. If the message was an
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
*
* Returns:
* Nothing.
*/
static void
SHA224_256PadMessage (SHA256Context * context, uint8_t Pad_Byte)
{
/*
* 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 >= (SHA256_Message_Block_Size - 8))
{
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
while (context->Message_Block_Index < SHA256_Message_Block_Size)
context->Message_Block[context->Message_Block_Index++] = 0;
SHA224_256ProcessMessageBlock (context);
}
else
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
while (context->Message_Block_Index < (SHA256_Message_Block_Size - 8))
context->Message_Block[context->Message_Block_Index++] = 0;
/*
* Store the message length as the last 8 octets
*/
context->Message_Block[56] = (uint8_t) (context->Length_High >> 24);
context->Message_Block[57] = (uint8_t) (context->Length_High >> 16);
context->Message_Block[58] = (uint8_t) (context->Length_High >> 8);
context->Message_Block[59] = (uint8_t) (context->Length_High);
context->Message_Block[60] = (uint8_t) (context->Length_Low >> 24);
context->Message_Block[61] = (uint8_t) (context->Length_Low >> 16);
context->Message_Block[62] = (uint8_t) (context->Length_Low >> 8);
context->Message_Block[63] = (uint8_t) (context->Length_Low);
SHA224_256ProcessMessageBlock (context);
}
/*
* SHA224_256ProcessMessageBlock
*
* Description:
* This function will process the next 512 bits of the message
* stored in the Message_Block array.
*
* Parameters:
* context: [in/out]
* The SHA context to update
*
* Returns:
* Nothing.
*
* Comments:
* Many of the variable names in this code, especially the
* single character names, were used because those were the
* names used in the publication.
*/
static void
SHA224_256ProcessMessageBlock (SHA256Context * context)
{
/* Constants defined in FIPS-180-2, section 4.2.2 */
static const uint32_t K[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
int t, t4; /* Loop counter */
uint32_t temp1, temp2; /* Temporary word value */
uint32_t W[64]; /* Word sequence */
uint32_t A, B, C, D, E, F, G, H; /* Word buffers */
/*
* Initialize the first 16 words in the array W
*/
for (t = t4 = 0; t < 16; t++, t4 += 4)
W[t] = (((uint32_t) context->Message_Block[t4]) << 24) |
(((uint32_t) context->Message_Block[t4 + 1]) << 16) |
(((uint32_t) context->Message_Block[t4 + 2]) << 8) |
(((uint32_t) context->Message_Block[t4 + 3]));
for (t = 16; t < 64; t++)
W[t] = SHA256_sigma1 (W[t - 2]) + W[t - 7] +
SHA256_sigma0 (W[t - 15]) + 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];
F = context->Intermediate_Hash[5];
G = context->Intermediate_Hash[6];
H = context->Intermediate_Hash[7];
for (t = 0; t < 64; t++)
{
temp1 = H + SHA256_SIGMA1 (E) + SHA_Ch (E, F, G) + K[t] + W[t];
temp2 = SHA256_SIGMA0 (A) + SHA_Maj (A, B, C);
H = G;
G = F;
F = E;
E = D + temp1;
D = C;
C = B;
B = A;
A = temp1 + temp2;
}
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->Intermediate_Hash[5] += F;
context->Intermediate_Hash[6] += G;
context->Intermediate_Hash[7] += H;
context->Message_Block_Index = 0;
}
/*
* SHA224_256Reset
*
* Description:
* This helper function will initialize the SHA256Context in
* preparation for computing a new SHA256 message digest.
*
* Parameters:
* context: [in/out]
* The context to reset.
* H0
* The initial hash value to use.
*
* Returns:
* sha Error Code.
*/
static int
SHA224_256Reset (SHA256Context * context, uint32_t * H0)
{
if (!context)
return shaNull;
context->Length_Low = 0;
context->Length_High = 0;
context->Message_Block_Index = 0;
context->Intermediate_Hash[0] = H0[0];
context->Intermediate_Hash[1] = H0[1];
context->Intermediate_Hash[2] = H0[2];
context->Intermediate_Hash[3] = H0[3];
context->Intermediate_Hash[4] = H0[4];
context->Intermediate_Hash[5] = H0[5];
context->Intermediate_Hash[6] = H0[6];
context->Intermediate_Hash[7] = H0[7];
context->Computed = 0;
context->Corrupted = 0;
return shaSuccess;
}
/*
* SHA224_256ResultN
*
* Description:
* This helper function will return the 224-bit or 256-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 28th/32nd element.
*
* Parameters:
* context: [in/out]
* The context to use to calculate the SHA hash.
* Message_Digest: [out]
* Where the digest is returned.
* HashSize: [in]
* The size of the hash, either 28 or 32.
*
* Returns:
* sha Error Code.
*/
static int
SHA224_256ResultN (SHA256Context * context,
uint8_t Message_Digest[], int HashSize)
{
int i;
if (!context || !Message_Digest)
return shaNull;
if (context->Corrupted)
return context->Corrupted;
if (!context->Computed)
SHA224_256Finalize (context, 0x80);
for (i = 0; i < HashSize; ++i)
Message_Digest[i] = (uint8_t)
(context->Intermediate_Hash[i >> 2] >> 8 * (3 - (i & 0x03)));
return shaSuccess;
}
/*
############################################################################
## USHA routines ##
############################################################################
*/