Sorry about the expmod function. As you said, I have just renamed it. This decrypt function works only for data encrypted with the private key (d,n). Thus, it is useful for checking signatures not for decrypting actual data. if you try the code below you will see it will fail: HB_hex_string_to_hex_bignum( TEST_PUBLIC_KEY_EXP, &(publicKey.e) );
HB_hex_string_to_hex_bignum( TEST_PUBLIC_KEY_MOD, &(publicKey.n) );
HB_int_to_hex_bignum( 0, &privateKey.e );
HB_int_to_hex_bignum( 0, &privateKey.n );
HB_hex_string_to_hex_bignum( TEST_RESULT, &rsaOrig );
rsaEncrypt( &rsaOrig, &rsaEncrypted, &publicKey );
rsaDecrypt( &rsaEncrypted, &rsaDecrypted, &publicKey );
if ( HB_compare( &rsaOrig, &rsaDecrypted ) == 0 )
{
printf( "Passed!\n" );
}
else
{
printf( "Failed!\n" );
}