public string Decrypt(string cipherText)
{
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
var textReaderPrivateKey = new StringReader(Certificados.RsaPrivateKey());
PemReader pr = new PemReader(textReaderPrivateKey);
AsymmetricCipherKeyPair keys = (AsymmetricCipherKeyPair)pr.ReadObject();
// Pure mathematical RSA implementation
// RsaEngine eng = new RsaEngine();
// PKCS1 v1.5 paddings
Pkcs1Encoding eng = new Pkcs1Encoding(new RsaEngine());
// PKCS1 OAEP paddings
//OaepEncoding eng = new OaepEncoding(new RsaEngine());
eng.Init(false, keys.Private);
int length = cipherTextBytes.Length;
int blockSize = eng.GetInputBlockSize();
List <byte> plainTextBytes = new List <byte>();
for (int chunkPosition = 0;
chunkPosition < length;
chunkPosition += blockSize)
{
int chunkSize = Math.Min(blockSize, length - chunkPosition);
plainTextBytes.AddRange(eng.ProcessBlock(
cipherTextBytes, chunkPosition, chunkSize
));
}
return(Encoding.UTF8.GetString(plainTextBytes.ToArray()));
}
public string Encrypt(string plainText)
{
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
var textReaderPublicKey = new StringReader(Certificados.RsaPublicKey());
PemReader pr = new PemReader(textReaderPublicKey);
RsaKeyParameters keys = (RsaKeyParameters)pr.ReadObject();
// Pure mathematical RSA implementation
// RsaEngine eng = new RsaEngine();
// PKCS1 v1.5 paddings
Pkcs1Encoding eng = new Pkcs1Encoding(new RsaEngine());
// PKCS1 OAEP paddings
//OaepEncoding eng = new OaepEncoding(new RsaEngine());
eng.Init(true, keys);
int length = plainTextBytes.Length;
int blockSize = eng.GetInputBlockSize();
List <byte> cipherTextBytes = new List <byte>();
for (int chunkPosition = 0;
chunkPosition < length;
chunkPosition += blockSize)
{
int chunkSize = Math.Min(blockSize, length - chunkPosition);
cipherTextBytes.AddRange(eng.ProcessBlock(
plainTextBytes, chunkPosition, chunkSize
));
}
return(Convert.ToBase64String(cipherTextBytes.ToArray()));
}
