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/**************************** usha.c ****************************/
/******************** See RFC 4634 for details ******************/
/*
* Description:
* This file implements a unified interface to the SHA algorithms.
*/
#include "sha.h"
/*
* USHAReset
*
* Description:
* This function will initialize the SHA Context in preparation
* for computing a new SHA message digest.
*
* Parameters:
* context: [in/out]
* The context to reset.
* whichSha: [in]
* Selects which SHA reset to call
*
* Returns:
* sha Error Code.
*
*/
int USHAReset(USHAContext *ctx, enum SHAversion whichSha)
{
if (ctx) {
ctx->whichSha = whichSha;
switch (whichSha) {
case CCSHA1: return SHA1Reset((SHA1Context*)&ctx->ctx);
case CCSHA224: return SHA224Reset((SHA224Context*)&ctx->ctx);
case CCSHA256: return SHA256Reset((SHA256Context*)&ctx->ctx);
case CCSHA384: return SHA384Reset((SHA384Context*)&ctx->ctx);
case CCSHA512: return SHA512Reset((SHA512Context*)&ctx->ctx);
default: return shaBadParam;
}
} else {
return shaNull;
}
}
/*
* USHAInput
*
* 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 USHAInput(USHAContext *ctx,
const uint8_t *bytes, unsigned int bytecount)
{
if (ctx) {
switch (ctx->whichSha) {
case CCSHA1:
return SHA1Input((SHA1Context*)&ctx->ctx, bytes, bytecount);
case CCSHA224:
return SHA224Input((SHA224Context*)&ctx->ctx, bytes,
bytecount);
case CCSHA256:
return SHA256Input((SHA256Context*)&ctx->ctx, bytes,
bytecount);
case CCSHA384:
return SHA384Input((SHA384Context*)&ctx->ctx, bytes,
bytecount);
case CCSHA512:
return SHA512Input((SHA512Context*)&ctx->ctx, bytes,
bytecount);
default: return shaBadParam;
}
} else {
return shaNull;
}
}
/*
* USHAFinalBits
*
* 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 USHAFinalBits(USHAContext *ctx,
const uint8_t bits, unsigned int bitcount)
{
if (ctx) {
switch (ctx->whichSha) {
case CCSHA1:
return SHA1FinalBits((SHA1Context*)&ctx->ctx, bits, bitcount);
case CCSHA224:
return SHA224FinalBits((SHA224Context*)&ctx->ctx, bits,
bitcount);
case CCSHA256:
return SHA256FinalBits((SHA256Context*)&ctx->ctx, bits,
bitcount);
case CCSHA384:
return SHA384FinalBits((SHA384Context*)&ctx->ctx, bits,
bitcount);
case CCSHA512:
return SHA512FinalBits((SHA512Context*)&ctx->ctx, bits,
bitcount);
default: return shaBadParam;
}
} else {
return shaNull;
}
}
/*
* USHAResult
*
* Description:
* 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.
*
* Parameters:
* context: [in/out]
* The context to use to calculate the SHA-1 hash.
* Message_Digest: [out]
* Where the digest is returned.
*
* Returns:
* sha Error Code.
*
*/
int USHAResult(USHAContext *ctx,
uint8_t Message_Digest[USHAMaxHashSize])
{
if (ctx) {
switch (ctx->whichSha) {
case CCSHA1:
return SHA1Result((SHA1Context*)&ctx->ctx, Message_Digest);
case CCSHA224:
return SHA224Result((SHA224Context*)&ctx->ctx, Message_Digest);
case CCSHA256:
return SHA256Result((SHA256Context*)&ctx->ctx, Message_Digest);
case CCSHA384:
return SHA384Result((SHA384Context*)&ctx->ctx, Message_Digest);
case CCSHA512:
return SHA512Result((SHA512Context*)&ctx->ctx, Message_Digest);
default: return shaBadParam;
}
} else {
return shaNull;
}
}
/*
* USHABlockSize
*
* Description:
* This function will return the blocksize for the given SHA
* algorithm.
*
* Parameters:
* whichSha:
* which SHA algorithm to query
*
* Returns:
* block size
*
*/
int USHABlockSize(enum SHAversion whichSha)
{
switch (whichSha) {
case CCSHA1: return SHA1_Message_Block_Size;
case CCSHA224: return SHA224_Message_Block_Size;
case CCSHA256: return SHA256_Message_Block_Size;
case CCSHA384: return SHA384_Message_Block_Size;
default:
case CCSHA512: return SHA512_Message_Block_Size;
}
}
/*
* USHAHashSize
*
* Description:
* This function will return the hashsize for the given SHA
* algorithm.
*
* Parameters:
* whichSha:
* which SHA algorithm to query
*
* Returns:
* hash size
*
*/
int USHAHashSize(enum SHAversion whichSha)
{
switch (whichSha) {
case CCSHA1: return SHA1HashSize;
case CCSHA224: return SHA224HashSize;
case CCSHA256: return SHA256HashSize;
case CCSHA384: return SHA384HashSize;
default:
case CCSHA512: return SHA512HashSize;
}
}
/*
* USHAHashSizeBits
*
* Description:
* This function will return the hashsize for the given SHA
* algorithm, expressed in bits.
*
* Parameters:
* whichSha:
* which SHA algorithm to query
*
* Returns:
* hash size in bits
*
*/
int USHAHashSizeBits(enum SHAversion whichSha)
{
switch (whichSha) {
case CCSHA1: return SHA1HashSizeBits;
case CCSHA224: return SHA224HashSizeBits;
case CCSHA256: return SHA256HashSizeBits;
case CCSHA384: return SHA384HashSizeBits;
default:
case CCSHA512: return SHA512HashSizeBits;
}
}
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