/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _HASHT_H_
#define _HASHT_H_

#include "prtypes.h"

/* Opaque objects */
typedef struct SECHashObjectStr SECHashObject;
typedef struct HASHContextStr HASHContext;

/*
 * The hash functions the security library supports
 * NOTE the order must match the definition of SECHashObjects[]!
 */
typedef enum {
    HASH_AlgNULL = 0,
    HASH_AlgMD2 = 1,
    HASH_AlgMD5 = 2,
    HASH_AlgSHA1 = 3,
    HASH_AlgSHA256 = 4,
    HASH_AlgSHA384 = 5,
    HASH_AlgSHA512 = 6,
    HASH_AlgSHA224 = 7,
    HASH_AlgSHA3_224 = 8,
    HASH_AlgSHA3_256 = 9,
    HASH_AlgSHA3_384 = 10,
    HASH_AlgSHA3_512 = 11,
    HASH_AlgTOTAL
} HASH_HashType;

/*
 * Number of bytes each hash algorithm produces
 */
#define MD2_LENGTH 16
#define MD5_LENGTH 16
#define SHA1_LENGTH 20
#define SHA224_LENGTH 28
#define SHA256_LENGTH 32
#define SHA384_LENGTH 48
#define SHA512_LENGTH 64
#define SHA3_224_LENGTH 28
#define SHA3_256_LENGTH 32
#define SHA3_384_LENGTH 48
#define SHA3_512_LENGTH 64
#define HASH_LENGTH_MAX SHA512_LENGTH

/*
 * Structure to hold hash computation info and routines
 */
struct SECHashObjectStr {
    unsigned int length; /* hash output length (in bytes) */
    void *(*create)(void);
    void *(*clone)(void *);
    void (*destroy)(void *, PRBool);
    void (*begin)(void *);
    void (*update)(void *, const unsigned char *, unsigned int);
    void (*end)(void *, unsigned char *, unsigned int *, unsigned int);
    unsigned int blocklength; /* hash input block size (in bytes) */
    HASH_HashType type;
    void (*end_raw)(void *, unsigned char *, unsigned int *, unsigned int);
};

struct HASHContextStr {
    const struct SECHashObjectStr *hashobj;
    void *hash_context;
};

#endif /* _HASHT_H_ */