hash_memory.c

来自「常用的64位密码加密算法」· C语言 代码 · 共 36 行

/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, [e-mail], http://libtomcrypt.org
 */
#include "mycrypt.h"

int hash_memory(int hash, const unsigned char *data, unsigned long len, unsigned char *dst, unsigned long *outlen)
{
    hash_state md;
    int err;

    _ARGCHK(data   != NULL);
    _ARGCHK(dst    != NULL);
    _ARGCHK(outlen != NULL);

    if ((err = hash_is_valid(hash)) != CRYPT_OK) {
        return err;
    }

    if (*outlen < hash_descriptor[hash].hashsize) {
       return CRYPT_BUFFER_OVERFLOW;
    }
    *outlen = hash_descriptor[hash].hashsize;

    hash_descriptor[hash].init(&md);
    hash_descriptor[hash].process(&md, data, len);
    hash_descriptor[hash].done(&md, dst);
    return CRYPT_OK;
}