/* Copyright 2003-2006, Voltage Security, all rights reserved.
 */

#include "vibecrypto.h"
#include "environment.h"
#include "base.h"
#include "libctx.h"

#ifndef _SHA_1_H
#define _SHA_1_H

#ifdef __cplusplus
extern "C" {
#endif

/* The bulk of SHA-1 is done by a Transform function. This may be a
 * separate function, some implementation may "inline" it.
 *
 * @param ctx The SHA1 context.
 * @param block The block of data to use in updating the state.
 * @return none
 */
typedef void VOLT_CALLING_CONV (*VSHA1Transform) VOLT_PROTO_LIST ((
   Pointer ctx,
   unsigned char *block
));

/* This is the standard SHA-1 context.
 */
typedef struct
{
  UInt32 initState[5];
  UInt32 state[5];
  UInt32 W[80];
  UInt32 countLow;
  UInt32 countHigh;
  unsigned char currentBlock[64];
  unsigned int currentBlockLen;
  unsigned int padding;
  VSHA1Transform SHA1Transform;
} VoltSHA1Ctx;

/* Implements VDigestInit.
 */
int VOLT_CALLING_CONV SHA1Init VOLT_PROTO_LIST ((
   VoltAlgorithmObject *obj
));

/* Implements VDigestUpdate.
 */
int VOLT_CALLING_CONV SHA1Update VOLT_PROTO_LIST ((
   VoltAlgorithmObject *obj,
   unsigned char *dataToDigest,
   unsigned int dataToDigestLen
));

/* Implements VDigestFinal.
 */
int VOLT_CALLING_CONV SHA1Final VOLT_PROTO_LIST ((
   VoltAlgorithmObject *obj,
   unsigned char *digest
));

/* Implements VSHA1Transform.
 */
void VOLT_CALLING_CONV SHA1Transform VOLT_PROTO_LIST ((
   Pointer ctx,
   unsigned char *block
));

/* Implements VCtxDestroy.
 */
void VOLT_CALLING_CONV SHA1ClassCtxDestroy VOLT_PROTO_LIST ((
   Pointer obj,
   Pointer ctx
));

#if VOLT_ENDIAN == VOLT_BIG_ENDIAN
#define SHA1_GET_UINT32(_buf,_value) VOLT_GET_BIG_ENDIAN_UINT32(_buf,_value)
#else
#define SHA1_GET_UINT32(_buf,_value) VOLT_GET_LITTLE_ENDIAN_UINT32(_buf,_value)
#endif

/* Rotate a 32-bit value left by count.
 */
#define SHA1_ROTL(_value,_count) VOLT_UINT32_ROTL(_value,_count)

/* SHA-1 constants.
 */
#define SHA1_K0 0x5A827999
#define SHA1_K2 0x6ED9EBA1
#define SHA1_K4 0x8F1BBCDC
#define SHA1_K6 0xCA62C1D6

#define F0(_B,_C,_D)  ( (_B & _C) | ((~_B) & _D) )
#define F2(_B,_C,_D)  (_B ^ _C ^ _D)
#define F4(_B,_C,_D)  ((_B & _C) | (_B & _D) | (_C & _D))
#define F6(_B,_C,_D)  (_B ^ _C ^ _D)

#ifdef __cplusplus
}
#endif

#endif /* _SHA_1_H */