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| #include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/sha.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
int main(void)
{
unsigned int k = 0;
/* SHA1 Initialization steps */
const unsigned char *d = (unsigned char*)"Hi dude, what about a test?";
/* Foobar1329 */
/* C'est la longueur en bytes qui est demandé, pas la longueur de la chaine */
/* C'est important pour SHA1() plus bas */
/* unsigned long n = (unsigned long)strlen((char*)d); */
unsigned long n = (unsigned long)strlen((char*)d) + 1;
unsigned char *md = malloc(SHA_DIGEST_LENGTH);
/* RSA Initialization steps */
RSA *var_RSA = NULL;
int modulus_size = 1024;
long public_exponent = 65537;
int V_sign = 0;
int V_verif = 0;
unsigned char *sigret = NULL;
unsigned int siglen = 0;
/* Generation of the digest */
SHA1(d,n,md);
/* Foobar1329 */
/* stdout plutôt ;) et puis non, md n'est pas une chaine littérale */
/* fprintf(stdin,"%s\n\n",md); */
/* RSA part */
/* Foobar1329 */
/* Le RSA_new est inutile, RSA_generate_key renvoie un ptr alloué */
/* var_RSA = RSA_new(); */
var_RSA = RSA_generate_key(modulus_size,public_exponent,NULL,NULL);
if(var_RSA==NULL)
printf("Error during the generation of the keys\n\n");
else
printf("Everything went fine during the generation of the keys\n\n");
sigret = malloc(sizeof(RSA_size(var_RSA)));
if(sigret==NULL)
printf("Error during the allocation of sigret\n\n");
else
printf("Everything went fine during the allocation of sigret\n\n");
/* Foobar1329 */
/* md est un message digest, de SHA_DIGEST_LENGTH bytes, et non une chaine
caractères, le pb vient de là ;) */
/*
V_sign = RSA_sign(NID_sha1,md,strlen((char*)md),sigret,&siglen,var_RSA);
*/
V_sign = RSA_sign(NID_sha1,md,SHA_DIGEST_LENGTH,sigret,&siglen,var_RSA);
if(V_sign==0)
printf("Problem while signing the digest\n\n");
else
printf("Everything went fine while signing the digest\n\n");
for(k=0;k<siglen;k++)
printf("%02X",sigret[k]);
printf("\n\n");
printf("---test---\n");
/* Print all the variables to be given to RSA_verify to check their accuracy */
printf("NID_sha1: %d\n",NID_sha1);
/* Foobar1329 */
/* Il faut remplacer les strlen par SHA_DIGEST_LENGTH ici */
printf("strlen(md): %d\n",strlen((char*)md));
for(k=0;k<strlen((char*)md);k++)
printf("%02X",md[k]);
printf("\n");
printf("siglen: %d\n",siglen);
for(k=0;k<siglen;k++)
printf("%02X",sigret[k]);
printf("\n");
/* Foobar1329 */
/* Meme pb qu'avec RSA_sign */
/*
V_verif = RSA_verify(NID_sha1,md,strlen((char*)md),sigret,siglen,var_RSA);
*/
V_verif = RSA_verify(NID_sha1,md,SHA_DIGEST_LENGTH,sigret,siglen,var_RSA);
printf("---test---\n");
if(V_verif==0)
printf("Problem while verifying the digest\n\n");
else
printf("Everything went fine while verifying the digest\n\n");
RSA_free(var_RSA);
return 0;
} |
