/// <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[] pubKey, byte[] data)
{
int bytesRead;
cipher.ImportSubjectPublicKeyInfo(pubKey, out bytesRead);
var hash = MsdnHash.Compute(MsdnHashAlgorithim.SHA1, data);
return(cipher.VerifyHash(hash, HashAlgorithmName.SHA1.ToString(), originalSignature));
}
/// <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[] privKey, byte[] data)
{
int bytesRead;
cipher.ImportPkcs8PrivateKey(privKey, out bytesRead);
var hash = MsdnHash.Compute(MsdnHashAlgorithim.SHA1, data);
return(cipher.SignHash(hash, HashAlgorithmName.SHA1.ToString()));
}
/// <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[] pubKey, byte[] data)
{
int bytesRead;
cipher.ImportRSAPublicKey(pubKey, out bytesRead);
var hash = MsdnHash.Compute(MsdnHashAlgorithim.SHA1, data);
return(cipher.VerifyHash(hash, originalSignature, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1));
}
/// <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[] privKey, byte[] data)
{
int bytesRead;
cipher.ImportRSAPrivateKey(privKey, out bytesRead);
var hash = MsdnHash.Compute(MsdnHashAlgorithim.SHA1, data);
return(cipher.SignHash(hash, HashAlgorithmName.SHA1, RSASignaturePadding.Pkcs1));
}
/// <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[] pubKey, byte[] data)
{
int bytesRead;
try
{
//Import public key bytes
cipher.ImportSubjectPublicKeyInfo(pubKey, out bytesRead);
}
catch (CryptographicException exception)
{
string message = "Signature Verification Failed!\n" +
$"{exception.Message}\n" +
"The contents of source do not represent an ASN.1-DER-encoded X.509 public key structure.\n" +
"-or- The contents of source indicate the key is for an algorithm other than the algorithm represented by this instance.\n" +
"-or- The contents of source represent the key in a format that is not supported.\n" +
"-or- The algorithm-specific key import failed.\n";
throw new CryptographicException(message, exception);
}
catch (PlatformNotSupportedException exception)
{
string message = "Signature Verification Failed!\n" +
$"{exception.Message}\n" +
"The public key is corrupted.\n" +
"Verify the public key.";
throw new CryptographicException(message, exception);
}
catch (Exception exception)
{
string message = "Signature Verification Failed!\n" +
$"{exception.Message}\n" +
"Contact developer.";
throw new CryptographicException(message, exception);
}
//hash data
var hash = MsdnHash.Compute(MsdnHashAlgorithim.SHA512, data);
//verify signature
return(cipher.VerifyHash(hash, originalSignature));
}
/// <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[] privKey, byte[] data)
{
int bytesRead;
try
{
//import private key bytes
cipher.ImportPkcs8PrivateKey(privKey, out bytesRead);
}
catch (CryptographicException exception)
{
string message = "Signature Failed!\n" +
$"{exception.Message}\n" +
"The contents of source do not represent an ASN.1-BER-encoded PKCS#8 private key structure.\n" +
"-or- The contents of source indicate the key is for an algorithm other than the algorithm represented by this instance.\n" +
"-or- The contents of source represent the key in a format that is not supported.\n" +
"-or- The algorithm-specific key import failed.\n";
throw new CryptographicException(message, exception);
}
catch (PlatformNotSupportedException exception)
{
string message = "Signature Failed!\n" +
$"{exception.Message}\n" +
"The public key is corrupted.\n" +
"Verify the public key.";
throw new CryptographicException(message, exception);
}
catch (Exception exception)
{
string message = "Signature Failed!\n" +
$"{exception.Message}\n" +
"Contact developer.";
throw new CryptographicException(message, exception);
}
//hash data
var hash = MsdnHash.Compute(MsdnHashAlgorithim.SHA512, data);
//sign hash
return(cipher.SignHash(hash));
}
