public byte[] EncryptRSA(byte[] data, RSA publicKey)
{
var cipher = CipherUtilities.GetCipher(RSA_CRYPTO_CIPHER);
cipher.Init(true, BouncyCastleUtilities.GetRsaPublicKey(publicKey));
cipher.ProcessBytes(data);
return(cipher.DoFinal());
}
public byte[] DecryptRSA(byte[] data, RSA privateKey)
{
var cipher = CipherUtilities.GetCipher(RSA_CRYPTO_CIPHER);
cipher.Init(false, BouncyCastleUtilities.GetRsaKeyPair(privateKey).Private);
cipher.ProcessBytes(data);
return(cipher.DoFinal());
}
public string GeneratePublicKeyFingerprintFromPrivateKey(RSA privateKey)
{
if (privateKey == null)
{
throw new ArgumentNullException(nameof(privateKey));
}
var keyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(BouncyCastleUtilities.GetRsaPublicKey(privateKey));
var keyBytes = keyInfo.ToAsn1Object().GetDerEncoded();
var hash = DoHash(keyBytes, new MD5Digest());
var hashString = ByteArrayUtils.ByteArrayToHexString(hash, ":");
return(hashString);
}
public RSA LoadRsaPublicKey(string keyContents)
{
if (keyContents == null)
{
throw new ArgumentNullException(nameof(keyContents));
}
var stringReader = new StringReader(keyContents);
var pemReader = new Org.BouncyCastle.OpenSsl.PemReader(stringReader);
var pemObject = pemReader.ReadObject();
if (pemObject is RsaKeyParameters)
{
return(BouncyCastleUtilities.ToRSA((RsaKeyParameters)pemObject));
}
throw new CryptographyError($"Failed to load public key from PEM file.");
}
public RSA LoadRsaPrivateKey(string keyContents)
{
if (keyContents == null)
{
throw new ArgumentNullException(nameof(keyContents));
}
try
{
var stringReader = new StringReader(keyContents);
var pemReader = new Org.BouncyCastle.OpenSsl.PemReader(stringReader);
var pemObject = pemReader.ReadObject();
if (pemObject is AsymmetricCipherKeyPair)
{
var cipherPair = (AsymmetricCipherKeyPair)pemObject;
if (cipherPair.Private == null)
{
throw new CryptographyError("No private key found in PEM object");
}
if (!(cipherPair.Private is RsaPrivateCrtKeyParameters))
{
throw new CryptographyError("Private key is not RSA");
}
return(BouncyCastleUtilities.ToRSA((RsaPrivateCrtKeyParameters)cipherPair.Private));
}
throw new CryptographyError($"Failed to load public key from PEM file. Object was not of type expected. ({pemObject})");
}
catch (CryptographyError)
{
throw;
}
catch (Exception ex)
{
throw new CryptographyError("Unknown error occurred while parsing PEM data, see inner exception", ex);
}
}
