public byte[] CalculateRawSignature(AsymmetricKeyParameter privateKey, byte[] md5andsha1)
{
// Note: Only use the SHA1 part of the hash
ISigner sig = new DsaDigestSigner(new DsaSigner(), new NullDigest());
sig.Init(true, privateKey);
sig.BlockUpdate(md5andsha1, 16, 20);
return(sig.GenerateSignature());
}
public virtual byte[] CalculateRawSignature(SecureRandom random,
AsymmetricKeyParameter privateKey, byte[] md5andsha1)
{
// Note: Only use the SHA1 part of the hash
ISigner sig = new DsaDigestSigner(CreateDsaImpl(), new NullDigest());
sig.Init(true, new ParametersWithRandom(privateKey, random));
sig.BlockUpdate(md5andsha1, 16, 20);
return(sig.GenerateSignature());
}
public byte[] Sign(byte[] data, string privateKey)
{
var key = PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
var dsaDigestSigner = new DsaDigestSigner(new DsaSigner(), new Sha1Digest());
dsaDigestSigner.Init(true, key);
dsaDigestSigner.BlockUpdate(data, 0, data.Length);
return(dsaDigestSigner.GenerateSignature());
}
public bool Verify(byte[] data, byte[] signature, string publicKey)
{
var key = PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
var dsaDigestSigner = new DsaDigestSigner(new DsaSigner(), new Sha1Digest());
dsaDigestSigner.Init(false, key);
dsaDigestSigner.BlockUpdate(data, 0, data.Length);
return(dsaDigestSigner.VerifySignature(signature));
}
/// <summary>
/// Signs the passed in data with a private key
/// </summary>
/// <param name="privateKey">the private key used to create the signature</param>
/// <param name="data">The data to sign</param>
/// <returns>the signature as a byte array</returns>
public byte[] Sign(byte[] privateKey, byte[] data)
{
var signer = new DsaDigestSigner(new DsaSigner(), new Sha1Digest());
var privKey = (DsaPrivateKeyParameters)CreateAsymmetricKeyParameterFromPrivateKeyInfo(privateKey);
signer.Init(true, privKey);
signer.BlockUpdate(data, 0, data.Length);
byte[] signature;
try
{
signature = signer.GenerateSignature();
}
catch (Exception exception)
{
string message = "Signature Failure!\n" +
$"{exception.Message}.\n" +
$"The private key file is corrupted, verify private key file or try another key.\n" +
$"If all fails create a new key pair.";
throw new CryptoException(message, exception);
}
return(signature);
}
/// <summary>
/// Verifies a signature to be authentic
/// </summary>
/// <param name="originalSignature">The signature which is be verified</param>
/// <param name="publicKey">the public key used for the verification</param>
/// <param name="data">the data which is signed</param>
/// <returns>true if signature is authentic, false if not</returns>
public bool Verify(byte[] originalSignature, byte[] publicKey, byte[] data)
{
var signer = new DsaDigestSigner(new DsaSigner(), new Sha1Digest());
DsaPublicKeyParameters pubKey = null;
try
{
pubKey = (DsaPublicKeyParameters)CreateAsymmetricKeyParameterFromPublicKeyInfo(publicKey);
}
catch (Exception exception)
{
string message = "Public Key Creation Failure!\n" +
$"{exception.Message}.\n" +
$"The public key file is corrupted, verify public key file or try another key.\n" +
$"If all fails create a new key pair.";
throw new CryptoException(message, exception);
}
signer.Init(false, pubKey);
signer.BlockUpdate(data, 0, data.Length);
return(signer.VerifySignature(originalSignature));
}
