85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt.h"
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/**
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@file gcm_file.c
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GCM process a file, Steffen Jaeckel
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*/
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#ifdef LTC_GCM_MODE
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#ifndef LTC_NO_FILE
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/**
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Process a file.
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c.f. gcm_filehandle() for basic documentation.
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It is possible, that in error-cases the 'out' file
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will be created and after the error occurred it will
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be removed again.
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@param cipher Index of cipher to use
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@param key The secret key
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@param keylen The length of the secret key
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@param IV The initial vector
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@param IVlen The length of the initial vector
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@param adata The additional authentication data (header)
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@param adatalen The length of the adata
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@param in The input file
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@param out The output file
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@param taglen The MAC tag length
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@param direction Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT)
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@param res [out] Result of the operation, 1==valid, 0==invalid
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@return CRYPT_OK on success
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*/
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int gcm_file( int cipher,
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const unsigned char *key, unsigned long keylen,
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const unsigned char *IV, unsigned long IVlen,
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const unsigned char *adata, unsigned long adatalen,
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const char *in,
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const char *out,
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unsigned long taglen,
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int direction,
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int *res)
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{
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int err;
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FILE *f_in = NULL, *f_out = NULL;
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(res != NULL);
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*res = 0;
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f_in = fopen(in, "rb");
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if (f_in == NULL) {
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err = CRYPT_FILE_NOTFOUND;
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goto LBL_ERR;
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}
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f_out = fopen(out, "w+b");
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if (f_out == NULL) {
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err = CRYPT_FILE_NOTFOUND;
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goto LBL_ERR;
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}
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err = gcm_filehandle(cipher, key, keylen, IV, IVlen, adata, adatalen, f_in, f_out, taglen, direction, res);
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LBL_ERR:
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if (f_out != NULL && fclose(f_out) != 0) {
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err = CRYPT_ERROR;
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}
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if (*res != 1) {
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remove(out);
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}
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if (f_in != NULL && fclose(f_in) != 0) {
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err = CRYPT_ERROR;
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}
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return err;
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}
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#endif
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#endif
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