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76 lines
1.9 KiB
76 lines
1.9 KiB
#define LTC_SOURCE
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/* 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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#include "tomcrypt.h"
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#ifndef LTC_NO_FILE
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/**
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@file hash_filehandle.c
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Hash open files, Tom St Denis
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*/
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/**
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Hash data from an open file handle.
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@param hash The index of the hash you want to use
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@param in The FILE* handle of the file you want to hash
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@param out [out] The destination of the digest
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@param outlen [in/out] The max size and resulting size of the digest
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@result CRYPT_OK if successful
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*/
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int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
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{
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hash_state md;
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unsigned char *buf;
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size_t x;
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int err;
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(in != NULL);
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if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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return CRYPT_MEM;
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}
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if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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if (*outlen < hash_descriptor[hash].hashsize) {
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*outlen = hash_descriptor[hash].hashsize;
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err = CRYPT_BUFFER_OVERFLOW;
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goto LBL_ERR;
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}
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if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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do {
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x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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if ((err = hash_descriptor[hash].process(&md, buf, (unsigned long)x)) != CRYPT_OK) {
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goto LBL_CLEANBUF;
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}
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} while (x == LTC_FILE_READ_BUFSIZE);
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if ((err = hash_descriptor[hash].done(&md, out)) == CRYPT_OK) {
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*outlen = hash_descriptor[hash].hashsize;
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}
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LBL_CLEANBUF:
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zeromem(buf, LTC_FILE_READ_BUFSIZE);
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LBL_ERR:
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XFREE(buf);
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return err;
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}
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#endif /* #ifndef LTC_NO_FILE */
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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