50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "mycrypt.h"
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int hash_filehandle(int hash, FILE *in, unsigned char *dst, unsigned long *outlen)
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{
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#ifdef NO_FILE
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return CRYPT_NOP;
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#else
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hash_state md;
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unsigned char buf[512];
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size_t x;
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int err;
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_ARGCHK(dst != NULL);
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_ARGCHK(outlen != NULL);
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_ARGCHK(in != NULL);
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if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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return err;
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}
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if (*outlen < hash_descriptor[hash].hashsize) {
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return CRYPT_BUFFER_OVERFLOW;
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}
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*outlen = hash_descriptor[hash].hashsize;
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hash_descriptor[hash].init(&md);
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do {
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x = fread(buf, 1, sizeof(buf), in);
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hash_descriptor[hash].process(&md, buf, x);
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} while (x == sizeof(buf));
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hash_descriptor[hash].done(&md, dst);
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#ifdef CLEAN_STACK
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zeromem(buf, sizeof(buf));
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#endif
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return CRYPT_OK;
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#endif
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}
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