/*****************************************************************************
* 函 数 名 : idioIdentify
*
* 功能描述 : 通过校验输入数据的hash值是 否
* 与其签名用RSA解密后的值一样
* 来校验输入数据的合法性 *
*
* 输入参数 : dataAddr--输入数据的地址
* dataLen--输入数据的长度
* pubKey--公钥
* pIdio--输入数据签名的指针
* 输出参数 :
*
* 返 回 值 : OK/ !OK
*
* 其它说明 :
*
*****************************************************************************/
int idioIdentify(UINT32 dataAddr, UINT32 dataLen, KEY_STRUCT *pubKey, UINT32* pIdio)
{
UINT32 sha256Hash[SHA256_HASH_SIZE]; /*用来存放SHA256值的临时buffer*/
UINT32 rsa[IDIO_LEN/4]; /*用来存放RSA加密值的临时buffer*/
int i;
memset(sha256Hash, 0, SHA256_HASH_SIZE*4);
memset(rsa, 0, IDIO_LEN);
/*通过SHA256计算输入数据(data)的hash值*/
if(OK != SHA256Hash(dataAddr, dataLen, sha256Hash))
{
print_info("\r\nhash calc err!" );
return !OK;
}
/*使用公钥(pubKey),通过RSA解密出输入签名(dataIdioAddr)的明文*/
if(OK != RSA(pubKey, pIdio, rsa))
{
print_info("\r\nrsa calc err!" );
return !OK;
}
/*比较二者是否相同*/
for(i = 0; i < SHA256_HASH_SIZE; i++)
{
if( sha256Hash[i] != rsa[i] )
{
return !OK;
}
}
return OK;
}
int main()
{
//shamir();
el_gamal();
vernama();
RSA();
return 0;
}
Result<RSA> RSA::from_pem(Slice pem) {
init_crypto();
auto *bio =
BIO_new_mem_buf(const_cast<void *>(static_cast<const void *>(pem.ubegin())), narrow_cast<int32>(pem.size()));
if (bio == nullptr) {
return Status::Error("Cannot create BIO");
}
SCOPE_EXIT {
BIO_free(bio);
};
auto *rsa = RSA_new();
if (rsa == nullptr) {
return Status::Error("Cannot create RSA");
}
SCOPE_EXIT {
RSA_free(rsa);
};
if (!PEM_read_bio_RSAPublicKey(bio, &rsa, nullptr, nullptr)) {
return Status::Error("Error while reading rsa pubkey");
}
if (RSA_size(rsa) != 256) {
return Status::Error("RSA_size != 256");
}
const BIGNUM *n_num;
const BIGNUM *e_num;
#if OPENSSL_VERSION_NUMBER < 0x10100000L
n_num = rsa->n;
e_num = rsa->e;
#else
RSA_get0_key(rsa, &n_num, &e_num, nullptr);
#endif
auto n = static_cast<void *>(BN_dup(n_num));
auto e = static_cast<void *>(BN_dup(e_num));
if (n == nullptr || e == nullptr) {
return Status::Error("Cannot dup BIGNUM");
}
return RSA(BigNum::from_raw(n), BigNum::from_raw(e));
}
void choice()
{
printf("\n ");
printf("\n \t \t \t \t Menu");
printf("\n ");
printf("\n \t \t \t1.Simple Cryptography");
printf("\n ");
printf("\n \t \t \t2.Difficult Cryptography");
printf("\n ");
printf("\n \t \t \t3.Exit");
printf("\n ");
int ch,flag=1;
printf("\n \t \t \tEnter the choice of Cryptography\n \t \t \t");
scanf("%d",&ch);
switch(ch)
{
case 1:caesar();
break;
case 2:RSA();
break;
case 3:exit(0);
default: printf("\n \t \t \tInvalid Choice");
printf("\n ");
flag=0;
}
if(flag==0)
{
int i;
system("cls"); //Used to clear the console
printf("\n \t \t \tInvalid Choice please wait");
for (i=0;i<4;i++)
{
delay();
printf(".");
}
system("cls");
choice();
}
}
RSA RSA::clone() const {
return RSA(n_.clone(), e_.clone());
}