/**
@param hash The index of the hash desired
@param fname The name of the file you wish to hash
@param out [out] The destination of the digest
@param outlen [in/out] The max size and resulting size of the message digest
@result CRYPT_OK if successful
*/
int hash_file(int hash, const char *fname, unsigned char *out, unsigned long *outlen)
{
#ifdef LTC_NO_FILE
(void)hash; (void)fname; (void)out; (void)outlen;
return CRYPT_NOP;
#else
FILE *in;
int err;
LTC_ARGCHK(fname != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
if ((err = hash_is_valid(hash)) != CRYPT_OK) {
return err;
}
in = fopen(fname, "rb");
if (in == NULL) {
return CRYPT_FILE_NOTFOUND;
}
err = hash_filehandle(hash, in, out, outlen);
if (fclose(in) != 0) {
return CRYPT_ERROR;
}
return err;
#endif
}
int main(int argc, char **argv)
{
rsa_key rsakey;
char fname[256];
char *hashname;
char expiry[256];
unsigned char buf[4096], rsabuf[2048], md[MAXBLOCKSIZE], sig[512];
unsigned long buflen, rsalen, mdlen, siglen;
FILE *infile;
int i;
int opt_v2 = 0;
int opt_fullkey = 0;
int argoffset = 0;
if (argc < 3) {
fprintf(stderr, "Usage: %s [--fullkey] [--v2 expiry] hashname key_file_name [signed_file_name]\n", argv[0]);
return EXIT_FAILURE;
}
LTC_ARGCHK(register_hash(&sha256_desc) != -1);
LTC_ARGCHK(register_hash(&sha512_desc) != -1);
LTC_ARGCHK(register_hash(&rmd160_desc) != -1);
LTC_ARGCHK(register_hash(&whirlpool_desc) != -1);
LTC_ARGCHK(register_prng(&sprng_desc) != -1);
ltc_mp = tfm_desc;
for ( i=1; i < argc; i++) {
if (strcmp(argv[i], OPT_V2)==0) {
opt_v2 = 1;
strncpy(expiry, argv[i+1], 256);
i++;
argoffset=argoffset+2;
continue;
}
if (strcmp(argv[i], OPT_FULLKEY)==0) {
opt_fullkey = 1;
argoffset++;
continue;
}
/* done! get out softly */
i=argc;
}
hashname = argv[1+argoffset];
/* get hashes of file */
mdlen = sizeof(md);
if ( argc - argoffset > 3) {
DO(hash_file(find_hash(argv[1+argoffset]), argv[3+argoffset], md, &mdlen));
} else {
DO(hash_filehandle(find_hash(argv[1+argoffset]), stdin, md, &mdlen));
}
/* read keyblob and import key from it */
strncpy(fname, argv[2+argoffset], 256);
strncat(fname, ".private", 256);
infile = fopen(fname, "rb");
LTC_ARGCHK(infile != NULL);
buflen = fread(buf, 1, sizeof(buf), infile);
fclose(infile);
/* now try to import the RSA key */
DO(rsa_import(buf, buflen, &rsakey));
/* now sign the hashes */
siglen = sizeof(sig);
DO(rsa_sign_hash(md, mdlen, sig, &siglen, NULL, find_prng("sprng"), find_hash(hashname), 8, &rsakey));
/* open output file */
if (opt_v2==1) {
fprintf(stdout, "sig02: %s ", hashname);
} else {
fprintf(stdout, "sig01: %s ", hashname);
}
/* read keyblob and import key from it */
strncpy(fname, argv[2+argoffset], 256);
strncat(fname, ".public", 256);
infile = fopen(fname, "rb");
LTC_ARGCHK(infile != NULL);
buflen = fread(buf, 1, sizeof(buf), infile);
fclose(infile);
if (opt_fullkey==1) {
i = 0;
} else {
i = buflen-32;
}
for ( ; i < buflen; i++)
fprintf(stdout, "%02x", buf[i]);
fprintf(stdout, " ");
if (opt_v2==1) {
fprintf(stdout, expiry);
fprintf(stdout, " ");
}
for (i = 0; i < siglen; i++)
fprintf(stdout, "%02x", sig[i]);
fprintf(stdout, "\n");
rsa_free(&rsakey);
return EXIT_SUCCESS;
}
