sha0.h

/**************************** sha0.h ****************************/
/***************** See RFC 6234 for details. *******************/
/*
   Copyright (c) 2011 IETF Trust and the persons identified as
   authors of the code.  All rights reserved.

   Redistribution and use in source and binary forms, with or
   without modification, are permitted provided that the following
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   - Redistributions of source code must retain the above
     copyright notice, this list of conditions and
     the following disclaimer.

   - Redistributions in binary form must reproduce the above
     copyright notice, this list of conditions and the following
     disclaimer in the documentation and/or other materials provided
     with the distribution.

   - Neither the name of Internet Society, IETF or IETF Trust, nor
     the names of specific contributors, may be used to endorse or
     promote products derived from this software without specific
     prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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   INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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   DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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*/
#ifndef _SHA0_H_
#define _SHA0_H_

/*
 *  Description:
 *      This file implements the Secure Hash Algorithms
 *      as defined in the U.S. National Institute of Standards
 *      and Technology Federal Information Processing Standards
 *      Publication (FIPS PUB) 180-3 published in October 2008
 *      and formerly defined in its predecessors, FIPS PUB 180-1
 *      and FIP PUB 180-2.
 *
 *      A combined document showing all algorithms is available at
 *              http://csrc.nist.gov/publications/fips/
 *                     fips180-3/fips180-3_final.pdf
 *
 *      The five hashes are defined in these sizes:
 *              SHA-0           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
 *
 *  Compilation Note:
 *    These files may be compiled with two options:
 *        USE_32BIT_ONLY - use 32-bit arithmetic only, for systems
 *                         without 64-bit integers
 *
 *        USE_MODIFIED_MACROS - use alternate form of the SHA_Ch()
 *                         and SHA_Maj() macros that are equivalent
 *                         and potentially faster on many systems
 *
 */

#include <stdint.h>
/*
 * 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
 *
 * See stdint-example.h
 */

#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 {
    SHA0_Message_Block_Size = 64, SHA224_Message_Block_Size = 64,
    SHA256_Message_Block_Size = 64, SHA384_Message_Block_Size = 128,
    SHA512_Message_Block_Size = 128,
    USHA_Max_Message_Block_Size = SHA512_Message_Block_Size,

    SHA0HashSize = 20, SHA224HashSize = 28, SHA256HashSize = 32,
    SHA384HashSize = 48, SHA512HashSize = 64,
    USHAMaxHashSize = SHA512HashSize,

    SHA0HashSizeBits = 160, SHA224HashSizeBits = 224,
    SHA256HashSizeBits = 256, SHA384HashSizeBits = 384,
    SHA512HashSizeBits = 512, USHAMaxHashSizeBits = SHA512HashSizeBits
};

/*
 *  This structure will hold context information for the SHA-0
 *  hashing operation.
 */
typedef struct SHA0Context {
    uint32_t Intermediate_Hash[SHA0HashSize/4]; /* Message Digest */

    uint32_t Length_High;               /* Message length in bits */
    uint32_t Length_Low;                /* Message length in bits */

    int_least16_t Message_Block_Index;  /* Message_Block array index */
                                        /* 512-bit message blocks */
    uint8_t Message_Block[SHA0_Message_Block_Size];

    int Computed;                   /* Is the hash computed? */
    int Corrupted;                  /* Cumulative corruption code */
} SHA0Context;

/*
 *  Function Prototypes
 */

/* SHA-0 */
extern int SHA0Reset(SHA0Context *);
extern int SHA0Input(SHA0Context *, const uint8_t *bytes,
                     unsigned int bytecount);
extern int SHA0FinalBits(SHA0Context *, uint8_t bits,
                         unsigned int bit_count);
extern int SHA0Result(SHA0Context *,
                      uint8_t Message_Digest[SHA0HashSize]);

#endif /* _SHA0_H_ */