/// <summary>Initialise the generator for signing.</summary>
public void InitSign(
int sigType,
PgpPrivateKey key,
SecureRandom random)
{
this.privKey = key;
this.signatureType = sigType;
try
{
ICipherParameters cp = key.Key;
if (random != null)
{
cp = new ParametersWithRandom(key.Key, random);
}
sig.Init(true, cp);
}
catch (InvalidKeyException e)
{
throw new PgpException("invalid key.", e);
}
dig.Reset();
lastb = 0;
}
/// <summary>Create a key pair from a PgpPrivateKey and a PgpPublicKey.</summary>
/// <param name="pub">The public key.</param>
/// <param name="priv">The private key.</param>
public PgpKeyPair(
PgpPublicKey pub,
PgpPrivateKey priv)
{
this.pub = pub;
this.priv = priv;
}
/// <summary>Initialise the generator for signing.</summary>
public void InitSign(
int sigType,
PgpPrivateKey key,
SecureRandom random)
{
this.privKey = key;
this.signatureType = sigType;
try
{
ICipherParameters cp = key.Key;
if (random != null)
{
cp = new ParametersWithRandom(key.Key, random);
}
sig.Init(true, cp);
}
catch (InvalidKeyException e)
{
throw new PgpException("invalid key.", e);
}
dig.Reset();
lastb = 0;
}
/// <summary>
/// Return the algorithm code for the symmetric algorithm used to encrypt the data.
/// </summary>
public SymmetricKeyAlgorithmTag GetSymmetricAlgorithm(
PgpPrivateKey privKey)
{
byte[] plain = fetchSymmetricKeyData(privKey);
return (SymmetricKeyAlgorithmTag) plain[0];
}
/// <summary>
/// Return the algorithm code for the symmetric algorithm used to encrypt the data.
/// </summary>
public SymmetricKeyAlgorithmTag GetSymmetricAlgorithm(
PgpPrivateKey privKey)
{
byte[] plain = fetchSymmetricKeyData(privKey);
return((SymmetricKeyAlgorithmTag)plain[0]);
}
/// <summary>Create a key pair from a PgpPrivateKey and a PgpPublicKey.</summary>
/// <param name="pub">The public key.</param>
/// <param name="priv">The private key.</param>
public PgpKeyPair(
PgpPublicKey pub,
PgpPrivateKey priv)
{
this.pub = pub;
this.priv = priv;
}
public PgpKeyPair(
PublicKeyAlgorithmTag algorithm,
AsymmetricKeyParameter pubKey,
AsymmetricKeyParameter privKey,
DateTime time)
{
this.pub = new PgpPublicKey(algorithm, pubKey, time);
this.priv = new PgpPrivateKey(privKey, pub.KeyId);
}
public PgpKeyPair(
PublicKeyAlgorithmTag algorithm,
AsymmetricKeyParameter pubKey,
AsymmetricKeyParameter privKey,
DateTime time)
{
this.pub = new PgpPublicKey(algorithm, pubKey, time);
this.priv = new PgpPrivateKey(privKey, pub.KeyId);
}
internal PgpSecretKey(
PgpPrivateKey privKey,
PgpPublicKey pubKey,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
bool useSha1,
SecureRandom rand)
: this(privKey, pubKey, encAlgorithm, passPhrase, useSha1, rand, false)
{
}
internal PgpSecretKey(
PgpPrivateKey privKey,
PgpPublicKey pubKey,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
bool useSha1,
SecureRandom rand)
: this(privKey, pubKey, encAlgorithm, passPhrase, useSha1, rand, false)
{
}
/// <summary>Return the decrypted data stream for the packet.</summary>
public Stream GetDataStream(
PgpPrivateKey privKey)
{
byte[] plain = fetchSymmetricKeyData(privKey);
IBufferedCipher c2;
string cipherName = PgpUtilities.GetSymmetricCipherName((SymmetricKeyAlgorithmTag)plain[0]);
string cName = cipherName;
try
{
if (encData is SymmetricEncIntegrityPacket)
{
cName += "/CFB/NoPadding";
}
else
{
cName += "/OpenPGPCFB/NoPadding";
}
c2 = CipherUtilities.GetCipher(cName);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("exception creating cipher", e);
}
if (c2 == null)
{
return(encData.GetInputStream());
}
try
{
KeyParameter key = ParameterUtilities.CreateKeyParameter(
cipherName, plain, 1, plain.Length - 3);
byte[] iv = new byte[c2.GetBlockSize()];
c2.Init(false, new ParametersWithIV(key, iv));
encStream = BcpgInputStream.Wrap(new CipherStream(encData.GetInputStream(), c2, null));
if (encData is SymmetricEncIntegrityPacket)
{
truncStream = new TruncatedStream(encStream);
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
encStream = new DigestStream(truncStream, digest, null);
}
if (Streams.ReadFully(encStream, iv, 0, iv.Length) < iv.Length)
{
throw new EndOfStreamException("unexpected end of stream.");
}
int v1 = encStream.ReadByte();
int v2 = encStream.ReadByte();
if (v1 < 0 || v2 < 0)
{
throw new EndOfStreamException("unexpected end of stream.");
}
// Note: the oracle attack on the "quick check" bytes is deemed
// a security risk for typical public key encryption usages,
// therefore we do not perform the check.
// bool repeatCheckPassed =
// iv[iv.Length - 2] == (byte)v1
// && iv[iv.Length - 1] == (byte)v2;
//
// // Note: some versions of PGP appear to produce 0 for the extra
// // bytes rather than repeating the two previous bytes
// bool zeroesCheckPassed =
// v1 == 0
// && v2 == 0;
//
// if (!repeatCheckPassed && !zeroesCheckPassed)
// {
// throw new PgpDataValidationException("quick check failed.");
// }
return(encStream);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception starting decryption", e);
}
}
private byte[] fetchSymmetricKeyData(
PgpPrivateKey privKey)
{
IBufferedCipher c1 = GetKeyCipher(keyData.Algorithm);
try
{
c1.Init(false, privKey.Key);
}
catch (InvalidKeyException e)
{
throw new PgpException("error setting asymmetric cipher", e);
}
BigInteger[] keyD = keyData.GetEncSessionKey();
if (keyData.Algorithm == PublicKeyAlgorithmTag.RsaEncrypt ||
keyData.Algorithm == PublicKeyAlgorithmTag.RsaGeneral)
{
c1.ProcessBytes(keyD[0].ToByteArrayUnsigned());
}
else
{
ElGamalPrivateKeyParameters k = (ElGamalPrivateKeyParameters)privKey.Key;
int size = (k.Parameters.P.BitLength + 7) / 8;
byte[] bi = keyD[0].ToByteArray();
int diff = bi.Length - size;
if (diff >= 0)
{
c1.ProcessBytes(bi, diff, size);
}
else
{
byte[] zeros = new byte[-diff];
c1.ProcessBytes(zeros);
c1.ProcessBytes(bi);
}
bi = keyD[1].ToByteArray();
diff = bi.Length - size;
if (diff >= 0)
{
c1.ProcessBytes(bi, diff, size);
}
else
{
byte[] zeros = new byte[-diff];
c1.ProcessBytes(zeros);
c1.ProcessBytes(bi);
}
}
byte[] plain;
try
{
plain = c1.DoFinal();
}
catch (Exception e)
{
throw new PgpException("exception decrypting secret key", e);
}
if (!ConfirmCheckSum(plain))
{
throw new PgpKeyValidationException("key checksum failed");
}
return(plain);
}
private byte[] fetchSymmetricKeyData(
PgpPrivateKey privKey)
{
IBufferedCipher c1 = GetKeyCipher(keyData.Algorithm);
try
{
c1.Init(false, privKey.Key);
}
catch (InvalidKeyException e)
{
throw new PgpException("error setting asymmetric cipher", e);
}
BigInteger[] keyD = keyData.GetEncSessionKey();
if (keyData.Algorithm == PublicKeyAlgorithmTag.RsaEncrypt
|| keyData.Algorithm == PublicKeyAlgorithmTag.RsaGeneral)
{
c1.ProcessBytes(keyD[0].ToByteArrayUnsigned());
}
else
{
ElGamalPrivateKeyParameters k = (ElGamalPrivateKeyParameters)privKey.Key;
int size = (k.Parameters.P.BitLength + 7) / 8;
byte[] bi = keyD[0].ToByteArray();
int diff = bi.Length - size;
if (diff >= 0)
{
c1.ProcessBytes(bi, diff, size);
}
else
{
byte[] zeros = new byte[-diff];
c1.ProcessBytes(zeros);
c1.ProcessBytes(bi);
}
bi = keyD[1].ToByteArray();
diff = bi.Length - size;
if (diff >= 0)
{
c1.ProcessBytes(bi, diff, size);
}
else
{
byte[] zeros = new byte[-diff];
c1.ProcessBytes(zeros);
c1.ProcessBytes(bi);
}
}
byte[] plain;
try
{
plain = c1.DoFinal();
}
catch (Exception e)
{
throw new PgpException("exception decrypting secret key", e);
}
if (!ConfirmCheckSum(plain))
throw new PgpKeyValidationException("key checksum failed");
return plain;
}
/// <summary>Return the decrypted data stream for the packet.</summary>
public Stream GetDataStream(
PgpPrivateKey privKey)
{
byte[] plain = fetchSymmetricKeyData(privKey);
IBufferedCipher c2;
string cipherName = PgpUtilities.GetSymmetricCipherName((SymmetricKeyAlgorithmTag) plain[0]);
string cName = cipherName;
try
{
if (encData is SymmetricEncIntegrityPacket)
{
cName += "/CFB/NoPadding";
}
else
{
cName += "/OpenPGPCFB/NoPadding";
}
c2 = CipherUtilities.GetCipher(cName);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("exception creating cipher", e);
}
if (c2 == null)
return encData.GetInputStream();
try
{
KeyParameter key = ParameterUtilities.CreateKeyParameter(
cipherName, plain, 1, plain.Length - 3);
byte[] iv = new byte[c2.GetBlockSize()];
c2.Init(false, new ParametersWithIV(key, iv));
encStream = BcpgInputStream.Wrap(new CipherStream(encData.GetInputStream(), c2, null));
if (encData is SymmetricEncIntegrityPacket)
{
truncStream = new TruncatedStream(encStream);
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
encStream = new DigestStream(truncStream, digest, null);
}
if (Streams.ReadFully(encStream, iv, 0, iv.Length) < iv.Length)
throw new EndOfStreamException("unexpected end of stream.");
int v1 = encStream.ReadByte();
int v2 = encStream.ReadByte();
if (v1 < 0 || v2 < 0)
throw new EndOfStreamException("unexpected end of stream.");
// Note: the oracle attack on the "quick check" bytes is deemed
// a security risk for typical public key encryption usages,
// therefore we do not perform the check.
// bool repeatCheckPassed =
// iv[iv.Length - 2] == (byte)v1
// && iv[iv.Length - 1] == (byte)v2;
//
// // Note: some versions of PGP appear to produce 0 for the extra
// // bytes rather than repeating the two previous bytes
// bool zeroesCheckPassed =
// v1 == 0
// && v2 == 0;
//
// if (!repeatCheckPassed && !zeroesCheckPassed)
// {
// throw new PgpDataValidationException("quick check failed.");
// }
return encStream;
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception starting decryption", e);
}
}
/// <summary>Initialise the generator for signing.</summary>
public void InitSign(
int sigType,
PgpPrivateKey key)
{
InitSign(sigType, key, null);
}
internal PgpSecretKey(
PgpPrivateKey privKey,
PgpPublicKey pubKey,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
bool useSha1,
SecureRandom rand,
bool isMasterKey)
{
BcpgObject secKey;
this.pub = pubKey;
switch (pubKey.Algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaSign:
case PublicKeyAlgorithmTag.RsaGeneral:
RsaPrivateCrtKeyParameters rsK = (RsaPrivateCrtKeyParameters)privKey.Key;
secKey = new RsaSecretBcpgKey(rsK.Exponent, rsK.P, rsK.Q);
break;
case PublicKeyAlgorithmTag.Dsa:
DsaPrivateKeyParameters dsK = (DsaPrivateKeyParameters)privKey.Key;
secKey = new DsaSecretBcpgKey(dsK.X);
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
ElGamalPrivateKeyParameters esK = (ElGamalPrivateKeyParameters)privKey.Key;
secKey = new ElGamalSecretBcpgKey(esK.X);
break;
default:
throw new PgpException("unknown key class");
}
try
{
MemoryStream bOut = new MemoryStream();
BcpgOutputStream pOut = new BcpgOutputStream(bOut);
pOut.WriteObject(secKey);
byte[] keyData = bOut.ToArray();
byte[] checksumBytes = Checksum(useSha1, keyData, keyData.Length);
pOut.Write(checksumBytes);
byte[] bOutData = bOut.ToArray();
if (encAlgorithm == SymmetricKeyAlgorithmTag.Null)
{
if (isMasterKey)
{
this.secret = new SecretKeyPacket(pub.publicPk, encAlgorithm, null, null, bOutData);
}
else
{
this.secret = new SecretSubkeyPacket(pub.publicPk, encAlgorithm, null, null, bOutData);
}
}
else
{
S2k s2k;
byte[] iv;
byte[] encData = EncryptKeyData(bOutData, encAlgorithm, passPhrase, rand, out s2k, out iv);
int s2kUsage = useSha1
? SecretKeyPacket.UsageSha1
: SecretKeyPacket.UsageChecksum;
if (isMasterKey)
{
this.secret = new SecretKeyPacket(pub.publicPk, encAlgorithm, s2kUsage, s2k, iv, encData);
}
else
{
this.secret = new SecretSubkeyPacket(pub.publicPk, encAlgorithm, s2kUsage, s2k, iv, encData);
}
}
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception encrypting key", e);
}
}
/// <summary>Initialise the generator for signing.</summary>
public void InitSign(
int sigType,
PgpPrivateKey key)
{
InitSign(sigType, key, null);
}
internal PgpSecretKey(
PgpPrivateKey privKey,
PgpPublicKey pubKey,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
bool useSha1,
SecureRandom rand,
bool isMasterKey)
{
BcpgObject secKey;
this.pub = pubKey;
switch (pubKey.Algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaSign:
case PublicKeyAlgorithmTag.RsaGeneral:
RsaPrivateCrtKeyParameters rsK = (RsaPrivateCrtKeyParameters) privKey.Key;
secKey = new RsaSecretBcpgKey(rsK.Exponent, rsK.P, rsK.Q);
break;
case PublicKeyAlgorithmTag.Dsa:
DsaPrivateKeyParameters dsK = (DsaPrivateKeyParameters) privKey.Key;
secKey = new DsaSecretBcpgKey(dsK.X);
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
ElGamalPrivateKeyParameters esK = (ElGamalPrivateKeyParameters) privKey.Key;
secKey = new ElGamalSecretBcpgKey(esK.X);
break;
default:
throw new PgpException("unknown key class");
}
try
{
MemoryStream bOut = new MemoryStream();
BcpgOutputStream pOut = new BcpgOutputStream(bOut);
pOut.WriteObject(secKey);
byte[] keyData = bOut.ToArray();
byte[] checksumBytes = Checksum(useSha1, keyData, keyData.Length);
pOut.Write(checksumBytes);
byte[] bOutData = bOut.ToArray();
if (encAlgorithm == SymmetricKeyAlgorithmTag.Null)
{
if (isMasterKey)
{
this.secret = new SecretKeyPacket(pub.publicPk, encAlgorithm, null, null, bOutData);
}
else
{
this.secret = new SecretSubkeyPacket(pub.publicPk, encAlgorithm, null, null, bOutData);
}
}
else
{
S2k s2k;
byte[] iv;
byte[] encData = EncryptKeyData(bOutData, encAlgorithm, passPhrase, rand, out s2k, out iv);
int s2kUsage = useSha1
? SecretKeyPacket.UsageSha1
: SecretKeyPacket.UsageChecksum;
if (isMasterKey)
{
this.secret = new SecretKeyPacket(pub.publicPk, encAlgorithm, s2kUsage, s2k, iv, encData);
}
else
{
this.secret = new SecretSubkeyPacket(pub.publicPk, encAlgorithm, s2kUsage, s2k, iv, encData);
}
}
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception encrypting key", e);
}
}
