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58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
#include "cryptwrapper.h"
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void mycryptwrapper_init(){
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/* Version check should be the very first call because it
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makes sure that important subsystems are initialized.
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#define NEED_LIBGCRYPT_VERSION to the minimum required version. */
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if (!gcry_check_version (NEED_LIBGCRYPT_VERSION))
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{
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fprintf (stderr, "libgcrypt is too old (need %s, have %s)\n",
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NEED_LIBGCRYPT_VERSION, gcry_check_version (NULL));
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exit (2);
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}
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/* Disable secure memory. */
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gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
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/* ... If required, other initialization goes here. */
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/* Tell Libgcrypt that initialization has completed. */
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gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
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HASH_SIZE = gcry_md_get_algo_dlen(algo);
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}
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void mycryptwrapper_print(const void * buf, size_t len){
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for (size_t i = 0; i< len; i++){
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printf("%02x ", ((uint8_t*)buf)[i]);
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}
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printf("\n");
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}
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int check_sha256_tag(uint8_t * ptr, size_t file_len){
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uint8_t * calc_hash = malloc(HASH_SIZE);
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gcry_md_hash_buffer(algo,calc_hash,ptr,file_len-HASH_SIZE);
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/*printf("hash\n");
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mycryptwrapper_print(calc_hash,32);
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printf("HASH in file:\n");
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for (int i = 0 ; i< HASH_SIZE; i++){
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printf("%02x ", ptr[file_len+i-HASH_SIZE]);
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}
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printf("file:\n%s",(char* )ptr);
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*/
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for (int i=0 ; i< HASH_SIZE; i++){
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//printf("%02x ", calc_hash[i]);
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if (calc_hash[i] != ptr[i+file_len-HASH_SIZE]){
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free(calc_hash);
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// printf("no match\n");
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return 0;
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}
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}
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return 1;
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}
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