int main()
{
DSA *key;
FILE *fp1, *fp2;
unsigned char digest[8] = "1234567";
int siglen;
unsigned char signature[1000];
int retcode;
key = DSA_generate_parameters(1024, NULL, 0, NULL, NULL, NULL, NULL);
if (key == NULL)
{
printf("\nFailed to generate parameters\n");
exit(1);
}
fp1 = fopen("params.dat", "w");
DSAparams_print_fp(fp1, key);
fclose(fp1);
DSA_generate_key(key);
if (key == NULL)
{
printf("\nFailed to generate key\n");
exit(1);
}
fp2 = fopen("key.dat", "w");
DSA_print_fp(fp2, key, 0);
fclose(fp2);
retcode = DSA_sign(0, digest, 8, signature, &siglen, key);
if (retcode == 0)
{
printf("\n *** Error in signing ***\n\n");
exit(1);
}
printf("\n%s\n",signature);
retcode = DSA_verify(0, digest, 8, signature, siglen, key);
if (retcode == 1)
printf("\n *** Valid signature ***\n\n");
if (retcode == 0)
printf("\n *** Incorrect signature ***\n\n");
if (retcode == -1)
printf("\n *** Error in verifying ***\n\n");
DSA_free(key);
return 0;
}
int main(int argc, char **argv)
{
DSA *dsa;
unsigned char* input_string;
unsigned char* sign_string;
unsigned int sig_len;
unsigned int i;
if ( argc != 2 )
{
fprintf(stderr, "%s <plain text>\n", argv[0]);
exit(-1);
}
input_string = (unsigned char*)calloc(strlen(argv[1]) + 1, sizeof(unsigned char));
if ( input_string == NULL )
{
fprintf(stderr, "Unable to allocate memory for input_string\n");
exit(-1);
}
strncpy((char *)input_string, argv[1], strlen(argv[1]));
dsa = DSA_generate_parameters(1024, NULL, 0, NULL, NULL, NULL, NULL);
DSA_generate_key(dsa);
sign_string = (unsigned char *)calloc(DSA_size(dsa), sizeof(unsigned char));
if ( sign_string == NULL )
{
fprintf(stderr, "Unable to allocate memory for sign_string\n");
exit(-1);
}
if ( DSA_sign(0, input_string, strlen((char *)input_string), sign_string, &sig_len, dsa) == 0 )
{
fprintf(stderr, "Sign error\n");
exit(-1);
}
int is_valid_signature = DSA_verify(0, input_string, strlen((char*)input_string), sign_string, sig_len, dsa);
DSAparams_print_fp(stdout, dsa);
printf("input_string = %s\n", input_string);
printf("signed string = ");
for ( i = 0; i < sig_len; i++ )
printf("%x%x", (sign_string[i] >> 4) & 0xf, sign_string[i] & 0xf);
printf("\n");
printf("is_valid_signature? = %d\n", is_valid_signature);
return 0;
}
int main()
{
FILE *fp;
int len, i;
MD5_CTX ctx;
unsigned char buf[1000];
unsigned char md5sum[16];
MD5_Init(&ctx);
if(!( fp = fopen("input.dat", "rb")))
{
printf("\nFailed to open file\n"); return (1);
}
while((len = fread( buf, 1, sizeof(buf), fp ) ) > 0 )
{
MD5_Update(&ctx, buf, len);
}
MD5_Final(md5sum, &ctx);
printf("MD5(input.dat) = ");
for( i = 0; i < 16; i++ )
{
printf("%02x", md5sum[i]);
}
printf("\n");
DSA *key;
FILE *fp1, *fp2;
/*unsigned char digest[8] = "1234567";*/
int siglen;
unsigned char signature[1000];
int retcode;
key = DSA_generate_parameters(1024, NULL, 0, NULL, NULL, NULL, NULL);
if (key == NULL)
{
printf("\nFailed to generate parameters\n");
exit(1);
}
fp1 = fopen("params.dat", "w");
DSAparams_print_fp(fp1, key);
fclose(fp1);
DSA_generate_key(key);
if (key == NULL)
{
printf("\nFailed to generate key\n");
exit(1);
}
fp2 = fopen("key.dat", "w");
DSA_print_fp(fp2, key, 0);
fclose(fp2);
retcode = DSA_sign(0, md5sum, 8, signature, &siglen, key);
if (retcode == 0)
{
printf("\n *** Error in signing ***\n\n");
exit(1);
}
FILE *fp3;
fp3 = fopen("signature.dat", "w");
fputs(signature, fp3);
fclose(fp3);
printf("\nSignature of the hash = ");
printf("%s\n",signature);
retcode = DSA_verify(0, md5sum, 8, signature, siglen, key);
if (retcode == 1)
printf("\n *** Valid signature ***\n\n");
if (retcode == 0)
printf("\n *** Incorrect signature ***\n\n");
if (retcode == -1)
printf("\n *** Error in verifying ***\n\n");
DSA_free(key);
return 0;
}
inline void dsa_key::print_parameters(file _file) const
{
error::throw_error_if_not(DSAparams_print_fp(_file.raw(), ptr().get()) != 0);
}
