Re: Can't BER decode RSA public key with NDK Android

2016-10-18 Thread Jeffrey Walton 


On Tuesday, October 18, 2016 at 11:17:09 PM UTC-4, Hoàng Hiệp wrote:
>
> I have problems using Crypto++ to save a RSA public key in string. When 
> decoding the key, I always get a BERDecodeErr exception.
>
> Code get public key and private key and is save to string
>
> KeyPairBase64 GenerateKeyPair::generateKeyPair(unsigned int aKeySize) {
> KeyPairBase64 keyPair = KeyPairBase64();
> // Generate keys
> AutoSeededRandomPool rng;
>
> InvertibleRSAFunction parameters;
> parameters.GenerateRandomWithKeySize(rng, aKeySize);
>
> RSA::PrivateKey privateKey(parameters);
> RSA::PublicKey publicKey(parameters);
>
> // save keys
> publicKey.Save(CryptoPP::Base64Encoder(
> new CryptoPP::StringSink(keyPair.publicKey)).Ref());
> privateKey.Save(CryptoPP::Base64Encoder(
> new CryptoPP::StringSink(keyPair.privateKey)).Ref());
>
> return keyPair;
> }
>
>
> This is Public key: 
> MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQDs648aASMAR9VprkzNVS7b‌​
> 36N1hiYvbBG0cdE0QkS3‌​H/sc3+Ej92lGBQErpBu9‌​LVhwN/beBX4QnbCn1eNS‌​
> rKoOzS4yqWlwOaCe0WLm‌​FDHCn1cMTkX89cT4A0pc‌​jBbY+0W7htxWcqHxEQH9‌​x/AjQ9/
> 4blerh1i6/lLI‌​o6hn2hB8kQIB
>
> Next I want to encrypt a string by public key (saved in string)
> Code: 
>
> string RsaEncryptor::encryptor(string plaintext, string publicKey) {
> std::string cipher;
> AutoSeededRandomPool prng;
> try {
> ByteQueue queue;
> Base64Decoder decoder(new Redirector(queue));
> decoder.Put((const byte *) publicKey.data(), publicKey.size());
> decoder.MessageEnd();
>
>
> RSA::PublicKey rsaPublick;
> rsaPublick.BERDecodePublicKey(queue, false, (size_t) 
> queue.MaxRetrievable());
>
> // BERDecodePrivateKey is a void function. Here's the only check
> // we have regarding the DER bytes consumed.
> CRYPTOPP_ASSERT(queue.IsEmpty());
>
>
> bool valid = rsaPublick.Validate(prng, 3);
> if (!valid)
> cipher = "RSA private key is not valid";
>
>
>
> RSAES_OAEP_SHA_Encryptor e(rsaPublick);
>
> StringSource(plaintext, true,
>  new PK_EncryptorFilter(prng, e,
> new StringSink(cipher)
>  ) // PK_EncryptorFilter
> ); // StringSource
> }
> catch (CryptoPP::Exception ) {
> cipher = e.what();
> }
> return cipher;
> }
>
>
> But  I always get a BERDecodeErr exception. (I've been tried change 
> BERDecodePublicKey 
> to Load() but it really does not work.). Please just help me is wrong 
> somewhere. Learn well if you can guide me to fix.
>

The key is malformed. For the analysis, see 
http://stackoverflow.com/a/40121565/608639 .

Jeff 

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Can't BER decode RSA public key with NDK Android

2016-10-18 Thread Hoàng Hiệp 
I have problems using Crypto++ to save a RSA public key in string. When 
decoding the key, I always get a BERDecodeErr exception.

Code get public key and private key and is save to string

KeyPairBase64 GenerateKeyPair::generateKeyPair(unsigned int aKeySize) {
KeyPairBase64 keyPair = KeyPairBase64();
// Generate keys
AutoSeededRandomPool rng;

InvertibleRSAFunction parameters;
parameters.GenerateRandomWithKeySize(rng, aKeySize);

RSA::PrivateKey privateKey(parameters);
RSA::PublicKey publicKey(parameters);

// save keys
publicKey.Save(CryptoPP::Base64Encoder(
new CryptoPP::StringSink(keyPair.publicKey)).Ref());
privateKey.Save(CryptoPP::Base64Encoder(
new CryptoPP::StringSink(keyPair.privateKey)).Ref());

return keyPair;
}


This is Public key: 
MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQDs648aASMAR9VprkzNVS7b‌​
36N1hiYvbBG0cdE0QkS3‌​H/sc3+Ej92lGBQErpBu9‌​LVhwN/beBX4QnbCn1eNS‌​
rKoOzS4yqWlwOaCe0WLm‌​FDHCn1cMTkX89cT4A0pc‌​jBbY+0W7htxWcqHxEQH9‌​x/AjQ9/
4blerh1i6/lLI‌​o6hn2hB8kQIB

Next I want to encrypt a string by public key (saved in string)
Code: 

string RsaEncryptor::encryptor(string plaintext, string publicKey) {
std::string cipher;
AutoSeededRandomPool prng;
try {
ByteQueue queue;
Base64Decoder decoder(new Redirector(queue));
decoder.Put((const byte *) publicKey.data(), publicKey.size());
decoder.MessageEnd();


RSA::PublicKey rsaPublick;
rsaPublick.BERDecodePublicKey(queue, false, (size_t) 
queue.MaxRetrievable());

// BERDecodePrivateKey is a void function. Here's the only check
// we have regarding the DER bytes consumed.
CRYPTOPP_ASSERT(queue.IsEmpty());


bool valid = rsaPublick.Validate(prng, 3);
if (!valid)
cipher = "RSA private key is not valid";



RSAES_OAEP_SHA_Encryptor e(rsaPublick);

StringSource(plaintext, true,
 new PK_EncryptorFilter(prng, e,
new StringSink(cipher)
 ) // PK_EncryptorFilter
); // StringSource
}
catch (CryptoPP::Exception ) {
cipher = e.what();
}
return cipher;
}


But  I always get a BERDecodeErr exception. (I've been tried change 
BERDecodePublicKey 
to Load() but it really does not work.). Please just help me is wrong 
somewhere. Learn well if you can guide me to fix.

Thanks!

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