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1295 lines (1135 loc) · 50.2 KB
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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Bcpg.OpenPgp
{
/// <remarks>General class to handle a PGP secret key object.</remarks>
public class PgpSecretKey
{
private readonly SecretKeyPacket secret;
private readonly PgpPublicKey pub;
internal PgpSecretKey(
SecretKeyPacket secret,
PgpPublicKey pub)
{
this.secret = secret;
this.pub = pub;
}
internal PgpSecretKey(
PgpPrivateKey privKey,
PgpPublicKey pubKey,
SymmetricKeyAlgorithmTag encAlgorithm,
byte[] rawPassPhrase,
bool clearPassPhrase,
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.ECDH:
case PublicKeyAlgorithmTag.ECDsa:
ECPrivateKeyParameters ecK = (ECPrivateKeyParameters)privKey.Key;
secKey = new ECSecretBcpgKey(ecK.D);
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[] checksumData = Checksum(useSha1, keyData, keyData.Length);
keyData = Arrays.Concatenate(keyData, checksumData);
if (encAlgorithm == SymmetricKeyAlgorithmTag.Null)
{
if (isMasterKey)
{
this.secret = new SecretKeyPacket(pub.publicPk, encAlgorithm, null, null, keyData);
}
else
{
this.secret = new SecretSubkeyPacket(pub.publicPk, encAlgorithm, null, null, keyData);
}
}
else
{
S2k s2k;
byte[] iv;
byte[] encData;
if (pub.Version >= 4)
{
encData = EncryptKeyDataV4(keyData, encAlgorithm, HashAlgorithmTag.Sha1, rawPassPhrase, clearPassPhrase, rand, out s2k, out iv);
}
else
{
encData = EncryptKeyDataV3(keyData, encAlgorithm, rawPassPhrase, clearPassPhrase, 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);
}
}
/// <remarks>
/// Conversion of the passphrase characters to bytes is performed using Convert.ToByte(), which is
/// the historical behaviour of the library (1.7 and earlier).
/// </remarks>
[Obsolete("Use the constructor taking an explicit 'useSha1' parameter instead")]
public PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm, passPhrase, false, hashedPackets, unhashedPackets, rand)
{
}
/// <remarks>
/// Conversion of the passphrase characters to bytes is performed using Convert.ToByte(), which is
/// the historical behaviour of the library (1.7 and earlier).
/// </remarks>
public PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm, false, passPhrase, useSha1, hashedPackets, unhashedPackets, rand)
{
}
/// <remarks>
/// If utf8PassPhrase is true, conversion of the passphrase to bytes uses Encoding.UTF8.GetBytes(), otherwise the conversion
/// is performed using Convert.ToByte(), which is the historical behaviour of the library (1.7 and earlier).
/// </remarks>
public PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
bool utf8PassPhrase,
char[] passPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm,
PgpUtilities.EncodePassPhrase(passPhrase, utf8PassPhrase), true,
useSha1, hashedPackets, unhashedPackets, rand)
{
}
/// <remarks>
/// Allows the caller to handle the encoding of the passphrase to bytes.
/// </remarks>
public PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
byte[] rawPassPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm, rawPassPhrase, false, useSha1, hashedPackets, unhashedPackets, rand)
{
}
internal PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
byte[] rawPassPhrase,
bool clearPassPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(keyPair.PrivateKey, CertifiedPublicKey(certificationLevel, keyPair, id, hashedPackets, unhashedPackets),
encAlgorithm, rawPassPhrase, clearPassPhrase, useSha1, rand, true)
{
}
/// <remarks>
/// Conversion of the passphrase characters to bytes is performed using Convert.ToByte(), which is
/// the historical behaviour of the library (1.7 and earlier).
/// </remarks>
public PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
HashAlgorithmTag hashAlgorithm,
char[] passPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm, hashAlgorithm, false, passPhrase, useSha1, hashedPackets, unhashedPackets, rand)
{
}
/// <remarks>
/// If utf8PassPhrase is true, conversion of the passphrase to bytes uses Encoding.UTF8.GetBytes(), otherwise the conversion
/// is performed using Convert.ToByte(), which is the historical behaviour of the library (1.7 and earlier).
/// </remarks>
public PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
HashAlgorithmTag hashAlgorithm,
bool utf8PassPhrase,
char[] passPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm, hashAlgorithm,
PgpUtilities.EncodePassPhrase(passPhrase, utf8PassPhrase), true,
useSha1, hashedPackets, unhashedPackets, rand)
{
}
/// <remarks>
/// Allows the caller to handle the encoding of the passphrase to bytes.
/// </remarks>
public PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
HashAlgorithmTag hashAlgorithm,
byte[] rawPassPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm, hashAlgorithm, rawPassPhrase, false, useSha1, hashedPackets, unhashedPackets, rand)
{
}
internal PgpSecretKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
HashAlgorithmTag hashAlgorithm,
byte[] rawPassPhrase,
bool clearPassPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(keyPair.PrivateKey, CertifiedPublicKey(certificationLevel, keyPair, id, hashedPackets, unhashedPackets, hashAlgorithm),
encAlgorithm, rawPassPhrase, clearPassPhrase, useSha1, rand, true)
{
}
private static PgpPublicKey CertifiedPublicKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets)
{
PgpSignatureGenerator sGen;
try
{
sGen = new PgpSignatureGenerator(keyPair.PublicKey.Algorithm, HashAlgorithmTag.Sha1);
}
catch (Exception e)
{
throw new PgpException("Creating signature generator: " + e.Message, e);
}
//
// Generate the certification
//
sGen.InitSign(certificationLevel, keyPair.PrivateKey);
sGen.SetHashedSubpackets(hashedPackets);
sGen.SetUnhashedSubpackets(unhashedPackets);
try
{
PgpSignature certification = sGen.GenerateCertification(id, keyPair.PublicKey);
return PgpPublicKey.AddCertification(keyPair.PublicKey, id, certification);
}
catch (Exception e)
{
throw new PgpException("Exception doing certification: " + e.Message, e);
}
}
private static PgpPublicKey CertifiedPublicKey(
int certificationLevel,
PgpKeyPair keyPair,
string id,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
HashAlgorithmTag hashAlgorithm)
{
PgpSignatureGenerator sGen;
try
{
sGen = new PgpSignatureGenerator(keyPair.PublicKey.Algorithm, hashAlgorithm);
}
catch (Exception e)
{
throw new PgpException("Creating signature generator: " + e.Message, e);
}
//
// Generate the certification
//
sGen.InitSign(certificationLevel, keyPair.PrivateKey);
sGen.SetHashedSubpackets(hashedPackets);
sGen.SetUnhashedSubpackets(unhashedPackets);
try
{
PgpSignature certification = sGen.GenerateCertification(id, keyPair.PublicKey);
return PgpPublicKey.AddCertification(keyPair.PublicKey, id, certification);
}
catch (Exception e)
{
throw new PgpException("Exception doing certification: " + e.Message, e);
}
}
public PgpSecretKey(
int certificationLevel,
PublicKeyAlgorithmTag algorithm,
AsymmetricKeyParameter pubKey,
AsymmetricKeyParameter privKey,
DateTime time,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel,
new PgpKeyPair(algorithm, pubKey, privKey, time),
id, encAlgorithm, passPhrase, false, hashedPackets, unhashedPackets, rand)
{
}
public PgpSecretKey(
int certificationLevel,
PublicKeyAlgorithmTag algorithm,
AsymmetricKeyParameter pubKey,
AsymmetricKeyParameter privKey,
DateTime time,
string id,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
bool useSha1,
PgpSignatureSubpacketVector hashedPackets,
PgpSignatureSubpacketVector unhashedPackets,
SecureRandom rand)
: this(certificationLevel, new PgpKeyPair(algorithm, pubKey, privKey, time), id, encAlgorithm, passPhrase, useSha1, hashedPackets, unhashedPackets, rand)
{
}
/// <summary>
/// Check if this key has an algorithm type that makes it suitable to use for signing.
/// </summary>
/// <remarks>
/// Note: with version 4 keys KeyFlags subpackets should also be considered when present for
/// determining the preferred use of the key.
/// </remarks>
/// <returns>
/// <c>true</c> if this key algorithm is suitable for use with signing.
/// </returns>
public bool IsSigningKey
{
get
{
switch (pub.Algorithm)
{
case PublicKeyAlgorithmTag.RsaGeneral:
case PublicKeyAlgorithmTag.RsaSign:
case PublicKeyAlgorithmTag.Dsa:
case PublicKeyAlgorithmTag.ECDsa:
case PublicKeyAlgorithmTag.ElGamalGeneral:
return true;
default:
return false;
}
}
}
/// <summary>True, if this is a master key.</summary>
public bool IsMasterKey
{
get { return pub.IsMasterKey; }
}
/// <summary>Detect if the Secret Key's Private Key is empty or not</summary>
public bool IsPrivateKeyEmpty
{
get
{
byte[] secKeyData = secret.GetSecretKeyData();
return secKeyData == null || secKeyData.Length < 1;
}
}
/// <summary>The algorithm the key is encrypted with.</summary>
public SymmetricKeyAlgorithmTag KeyEncryptionAlgorithm
{
get { return secret.EncAlgorithm; }
}
/// <summary>The key ID of the public key associated with this key.</summary>
public long KeyId
{
get { return pub.KeyId; }
}
/// <summary>Return the S2K usage associated with this key.</summary>
public int S2kUsage
{
get { return secret.S2kUsage; }
}
/// <summary>Return the S2K used to process this key.</summary>
public S2k S2k
{
get { return secret.S2k; }
}
/// <summary>The public key associated with this key.</summary>
public PgpPublicKey PublicKey
{
get { return pub; }
}
/// <summary>Allows enumeration of any user IDs associated with the key.</summary>
/// <returns>An <c>IEnumerable</c> of <c>string</c> objects.</returns>
public IEnumerable UserIds
{
get { return pub.GetUserIds(); }
}
/// <summary>Allows enumeration of any user attribute vectors associated with the key.</summary>
/// <returns>An <c>IEnumerable</c> of <c>string</c> objects.</returns>
public IEnumerable UserAttributes
{
get { return pub.GetUserAttributes(); }
}
private byte[] ExtractKeyData(byte[] rawPassPhrase, bool clearPassPhrase)
{
SymmetricKeyAlgorithmTag encAlgorithm = secret.EncAlgorithm;
byte[] encData = secret.GetSecretKeyData();
if (encAlgorithm == SymmetricKeyAlgorithmTag.Null)
// TODO Check checksum here?
return encData;
// TODO Factor this block out as 'decryptData'
try
{
KeyParameter key = PgpUtilities.DoMakeKeyFromPassPhrase(secret.EncAlgorithm, secret.S2k, rawPassPhrase, clearPassPhrase);
byte[] iv = secret.GetIV();
byte[] data;
if (secret.PublicKeyPacket.Version >= 4)
{
data = RecoverKeyData(encAlgorithm, "/CFB/NoPadding", key, iv, encData, 0, encData.Length);
bool useSha1 = secret.S2kUsage == SecretKeyPacket.UsageSha1;
byte[] check = Checksum(useSha1, data, (useSha1) ? data.Length - 20 : data.Length - 2);
for (int i = 0; i != check.Length; i++)
{
if (check[i] != data[data.Length - check.Length + i])
{
throw new PgpException("Checksum mismatch at " + i + " of " + check.Length);
}
}
}
else // version 2 or 3, RSA only.
{
data = new byte[encData.Length];
iv = Arrays.Clone(iv);
//
// read in the four numbers
//
int pos = 0;
for (int i = 0; i != 4; i++)
{
int encLen = (((encData[pos] << 8) | (encData[pos + 1] & 0xff)) + 7) / 8;
data[pos] = encData[pos];
data[pos + 1] = encData[pos + 1];
pos += 2;
byte[] tmp = RecoverKeyData(encAlgorithm, "/CFB/NoPadding", key, iv, encData, pos, encLen);
Array.Copy(tmp, 0, data, pos, encLen);
pos += encLen;
if (i != 3)
{
Array.Copy(encData, pos - iv.Length, iv, 0, iv.Length);
}
}
//
// verify and copy checksum
//
data[pos] = encData[pos];
data[pos + 1] = encData[pos + 1];
int cs = ((encData[pos] << 8) & 0xff00) | (encData[pos + 1] & 0xff);
int calcCs = 0;
for (int j = 0; j < pos; j++)
{
calcCs += data[j] & 0xff;
}
calcCs &= 0xffff;
if (calcCs != cs)
{
throw new PgpException("Checksum mismatch: passphrase wrong, expected "
+ cs.ToString("X")
+ " found " + calcCs.ToString("X"));
}
}
return data;
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception decrypting key", e);
}
}
private static byte[] RecoverKeyData(SymmetricKeyAlgorithmTag encAlgorithm, string modeAndPadding,
KeyParameter key, byte[] iv, byte[] keyData, int keyOff, int keyLen)
{
IBufferedCipher c;
try
{
string cName = PgpUtilities.GetSymmetricCipherName(encAlgorithm);
c = CipherUtilities.GetCipher(cName + modeAndPadding);
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
c.Init(false, new ParametersWithIV(key, iv));
return c.DoFinal(keyData, keyOff, keyLen);
}
/// <summary>Extract a <c>PgpPrivateKey</c> from this secret key's encrypted contents.</summary>
/// <remarks>
/// Conversion of the passphrase characters to bytes is performed using Convert.ToByte(), which is
/// the historical behaviour of the library (1.7 and earlier).
/// </remarks>
public PgpPrivateKey ExtractPrivateKey(char[] passPhrase)
{
return DoExtractPrivateKey(PgpUtilities.EncodePassPhrase(passPhrase, false), true);
}
/// <summary>Extract a <c>PgpPrivateKey</c> from this secret key's encrypted contents.</summary>
/// <remarks>
/// The passphrase is encoded to bytes using UTF8 (Encoding.UTF8.GetBytes).
/// </remarks>
public PgpPrivateKey ExtractPrivateKeyUtf8(char[] passPhrase)
{
return DoExtractPrivateKey(PgpUtilities.EncodePassPhrase(passPhrase, true), true);
}
/// <summary>Extract a <c>PgpPrivateKey</c> from this secret key's encrypted contents.</summary>
/// <remarks>
/// Allows the caller to handle the encoding of the passphrase to bytes.
/// </remarks>
public PgpPrivateKey ExtractPrivateKeyRaw(byte[] rawPassPhrase)
{
return DoExtractPrivateKey(rawPassPhrase, false);
}
internal PgpPrivateKey DoExtractPrivateKey(byte[] rawPassPhrase, bool clearPassPhrase)
{
if (IsPrivateKeyEmpty)
return null;
PublicKeyPacket pubPk = secret.PublicKeyPacket;
try
{
byte[] data = ExtractKeyData(rawPassPhrase, clearPassPhrase);
BcpgInputStream bcpgIn = BcpgInputStream.Wrap(new MemoryStream(data, false));
AsymmetricKeyParameter privateKey;
switch (pubPk.Algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaGeneral:
case PublicKeyAlgorithmTag.RsaSign:
RsaPublicBcpgKey rsaPub = (RsaPublicBcpgKey)pubPk.Key;
RsaSecretBcpgKey rsaPriv = new RsaSecretBcpgKey(bcpgIn);
RsaPrivateCrtKeyParameters rsaPrivSpec = new RsaPrivateCrtKeyParameters(
rsaPriv.Modulus,
rsaPub.PublicExponent,
rsaPriv.PrivateExponent,
rsaPriv.PrimeP,
rsaPriv.PrimeQ,
rsaPriv.PrimeExponentP,
rsaPriv.PrimeExponentQ,
rsaPriv.CrtCoefficient);
privateKey = rsaPrivSpec;
break;
case PublicKeyAlgorithmTag.Dsa:
DsaPublicBcpgKey dsaPub = (DsaPublicBcpgKey)pubPk.Key;
DsaSecretBcpgKey dsaPriv = new DsaSecretBcpgKey(bcpgIn);
DsaParameters dsaParams = new DsaParameters(dsaPub.P, dsaPub.Q, dsaPub.G);
privateKey = new DsaPrivateKeyParameters(dsaPriv.X, dsaParams);
break;
case PublicKeyAlgorithmTag.ECDH:
privateKey = GetECKey("ECDH", bcpgIn);
break;
case PublicKeyAlgorithmTag.ECDsa:
privateKey = GetECKey("ECDSA", bcpgIn);
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
ElGamalPublicBcpgKey elPub = (ElGamalPublicBcpgKey)pubPk.Key;
ElGamalSecretBcpgKey elPriv = new ElGamalSecretBcpgKey(bcpgIn);
ElGamalParameters elParams = new ElGamalParameters(elPub.P, elPub.G);
privateKey = new ElGamalPrivateKeyParameters(elPriv.X, elParams);
break;
default:
throw new PgpException("unknown public key algorithm encountered");
}
return new PgpPrivateKey(KeyId, pubPk, privateKey);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception constructing key", e);
}
}
private ECPrivateKeyParameters GetECKey(string algorithm, BcpgInputStream bcpgIn)
{
ECPublicBcpgKey ecdsaPub = (ECPublicBcpgKey)secret.PublicKeyPacket.Key;
ECSecretBcpgKey ecdsaPriv = new ECSecretBcpgKey(bcpgIn);
return new ECPrivateKeyParameters(algorithm, ecdsaPriv.X, ecdsaPub.CurveOid);
}
private static byte[] Checksum(
bool useSha1,
byte[] bytes,
int length)
{
if (useSha1)
{
try
{
IDigest dig = DigestUtilities.GetDigest("SHA1");
dig.BlockUpdate(bytes, 0, length);
return DigestUtilities.DoFinal(dig);
}
//catch (NoSuchAlgorithmException e)
catch (Exception e)
{
throw new PgpException("Can't find SHA-1", e);
}
}
else
{
int Checksum = 0;
for (int i = 0; i != length; i++)
{
Checksum += bytes[i];
}
return new byte[] { (byte)(Checksum >> 8), (byte)Checksum };
}
}
public byte[] GetEncoded()
{
MemoryStream bOut = new MemoryStream();
Encode(bOut);
return bOut.ToArray();
}
public void Encode(
Stream outStr)
{
BcpgOutputStream bcpgOut = BcpgOutputStream.Wrap(outStr);
bcpgOut.WritePacket(secret);
if (pub.trustPk != null)
{
bcpgOut.WritePacket(pub.trustPk);
}
if (pub.subSigs == null) // is not a sub key
{
foreach (PgpSignature keySig in pub.keySigs)
{
keySig.Encode(bcpgOut);
}
for (int i = 0; i != pub.ids.Count; i++)
{
object pubID = pub.ids[i];
if (pubID is string)
{
string id = (string) pubID;
bcpgOut.WritePacket(new UserIdPacket(id));
}
else
{
PgpUserAttributeSubpacketVector v = (PgpUserAttributeSubpacketVector) pubID;
bcpgOut.WritePacket(new UserAttributePacket(v.ToSubpacketArray()));
}
if (pub.idTrusts[i] != null)
{
bcpgOut.WritePacket((ContainedPacket)pub.idTrusts[i]);
}
foreach (PgpSignature sig in (IList) pub.idSigs[i])
{
sig.Encode(bcpgOut);
}
}
}
else
{
foreach (PgpSignature subSig in pub.subSigs)
{
subSig.Encode(bcpgOut);
}
}
// TODO Check that this is right/necessary
//bcpgOut.Finish();
}
/// <summary>
/// Return a copy of the passed in secret key, encrypted using a new password
/// and the passed in algorithm.
/// </summary>
/// <remarks>
/// Conversion of the passphrase characters to bytes is performed using Convert.ToByte(), which is
/// the historical behaviour of the library (1.7 and earlier).
/// </remarks>
/// <param name="key">The PgpSecretKey to be copied.</param>
/// <param name="oldPassPhrase">The current password for the key.</param>
/// <param name="newPassPhrase">The new password for the key.</param>
/// <param name="newEncAlgorithm">The algorithm to be used for the encryption.</param>
/// <param name="rand">Source of randomness.</param>
public static PgpSecretKey CopyWithNewPassword(
PgpSecretKey key,
char[] oldPassPhrase,
char[] newPassPhrase,
SymmetricKeyAlgorithmTag newEncAlgorithm,
SecureRandom rand)
{
return DoCopyWithNewPassword(key, PgpUtilities.EncodePassPhrase(oldPassPhrase, false),
PgpUtilities.EncodePassPhrase(newPassPhrase, false), true, newEncAlgorithm, rand);
}
/// <summary>
/// Return a copy of the passed in secret key, encrypted using a new password
/// and the passed in algorithm.
/// </summary>
/// <remarks>
/// The passphrase is encoded to bytes using UTF8 (Encoding.UTF8.GetBytes).
/// </remarks>
/// <param name="key">The PgpSecretKey to be copied.</param>
/// <param name="oldPassPhrase">The current password for the key.</param>
/// <param name="newPassPhrase">The new password for the key.</param>
/// <param name="newEncAlgorithm">The algorithm to be used for the encryption.</param>
/// <param name="rand">Source of randomness.</param>
public static PgpSecretKey CopyWithNewPasswordUtf8(
PgpSecretKey key,
char[] oldPassPhrase,
char[] newPassPhrase,
SymmetricKeyAlgorithmTag newEncAlgorithm,
SecureRandom rand)
{
return DoCopyWithNewPassword(key, PgpUtilities.EncodePassPhrase(oldPassPhrase, true),
PgpUtilities.EncodePassPhrase(newPassPhrase, true), true, newEncAlgorithm, rand);
}
/// <summary>
/// Return a copy of the passed in secret key, encrypted using a new password
/// and the passed in algorithm.
/// </summary>
/// <remarks>
/// Allows the caller to handle the encoding of the passphrase to bytes.
/// </remarks>
/// <param name="key">The PgpSecretKey to be copied.</param>
/// <param name="rawOldPassPhrase">The current password for the key.</param>
/// <param name="rawNewPassPhrase">The new password for the key.</param>
/// <param name="newEncAlgorithm">The algorithm to be used for the encryption.</param>
/// <param name="rand">Source of randomness.</param>
public static PgpSecretKey CopyWithNewPasswordRaw(
PgpSecretKey key,
byte[] rawOldPassPhrase,
byte[] rawNewPassPhrase,
SymmetricKeyAlgorithmTag newEncAlgorithm,
SecureRandom rand)
{
return DoCopyWithNewPassword(key, rawOldPassPhrase, rawNewPassPhrase, false, newEncAlgorithm, rand);
}
internal static PgpSecretKey DoCopyWithNewPassword(
PgpSecretKey key,
byte[] rawOldPassPhrase,
byte[] rawNewPassPhrase,
bool clearPassPhrase,
SymmetricKeyAlgorithmTag newEncAlgorithm,
SecureRandom rand)
{
if (key.IsPrivateKeyEmpty)
throw new PgpException("no private key in this SecretKey - public key present only.");
byte[] rawKeyData = key.ExtractKeyData(rawOldPassPhrase, clearPassPhrase);
int s2kUsage = key.secret.S2kUsage;
byte[] iv = null;
S2k s2k = null;
byte[] keyData;
PublicKeyPacket pubKeyPacket = key.secret.PublicKeyPacket;
if (newEncAlgorithm == SymmetricKeyAlgorithmTag.Null)
{
s2kUsage = SecretKeyPacket.UsageNone;
if (key.secret.S2kUsage == SecretKeyPacket.UsageSha1) // SHA-1 hash, need to rewrite Checksum
{
keyData = new byte[rawKeyData.Length - 18];
Array.Copy(rawKeyData, 0, keyData, 0, keyData.Length - 2);
byte[] check = Checksum(false, keyData, keyData.Length - 2);
keyData[keyData.Length - 2] = check[0];
keyData[keyData.Length - 1] = check[1];
}
else
{
keyData = rawKeyData;
}
}
else
{
if (s2kUsage == SecretKeyPacket.UsageNone)
{
s2kUsage = SecretKeyPacket.UsageChecksum;
}
try
{
if (pubKeyPacket.Version >= 4)
{
keyData = EncryptKeyDataV4(rawKeyData, newEncAlgorithm, HashAlgorithmTag.Sha1, rawNewPassPhrase, clearPassPhrase, rand, out s2k, out iv);
}
else
{
keyData = EncryptKeyDataV3(rawKeyData, newEncAlgorithm, rawNewPassPhrase, clearPassPhrase, rand, out s2k, out iv);
}
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception encrypting key", e);
}
}
SecretKeyPacket secret;
if (key.secret is SecretSubkeyPacket)
{
secret = new SecretSubkeyPacket(pubKeyPacket, newEncAlgorithm, s2kUsage, s2k, iv, keyData);
}
else
{
secret = new SecretKeyPacket(pubKeyPacket, newEncAlgorithm, s2kUsage, s2k, iv, keyData);
}
return new PgpSecretKey(secret, key.pub);
}
/// <summary>Replace the passed the public key on the passed in secret key.</summary>
/// <param name="secretKey">Secret key to change.</param>
/// <param name="publicKey">New public key.</param>
/// <returns>A new secret key.</returns>
/// <exception cref="ArgumentException">If KeyId's do not match.</exception>
public static PgpSecretKey ReplacePublicKey(
PgpSecretKey secretKey,
PgpPublicKey publicKey)
{
if (publicKey.KeyId != secretKey.KeyId)
throw new ArgumentException("KeyId's do not match");
return new PgpSecretKey(secretKey.secret, publicKey);
}
private static byte[] EncryptKeyDataV3(
byte[] rawKeyData,
SymmetricKeyAlgorithmTag encAlgorithm,
byte[] rawPassPhrase,
bool clearPassPhrase,
SecureRandom random,
out S2k s2k,
out byte[] iv)
{
// Version 2 or 3 - RSA Keys only
s2k = null;
iv = null;
KeyParameter encKey = PgpUtilities.DoMakeKeyFromPassPhrase(encAlgorithm, s2k, rawPassPhrase, clearPassPhrase);
byte[] keyData = new byte[rawKeyData.Length];
//
// process 4 numbers
//
int pos = 0;
for (int i = 0; i != 4; i++)
{
int encLen = (((rawKeyData[pos] << 8) | (rawKeyData[pos + 1] & 0xff)) + 7) / 8;
keyData[pos] = rawKeyData[pos];
keyData[pos + 1] = rawKeyData[pos + 1];
byte[] tmp;
if (i == 0)
{
tmp = EncryptData(encAlgorithm, encKey, rawKeyData, pos + 2, encLen, random, ref iv);
}
else
{
byte[] tmpIv = Arrays.CopyOfRange(keyData, pos - iv.Length, pos);