717 lines
22 KiB
C#
717 lines
22 KiB
C#
using System;
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using System.Collections;
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using System.IO;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Security;
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namespace Org.BouncyCastle.Bcpg.OpenPgp
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{
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/// <remarks>General class to handle a PGP secret key object.</remarks>
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public class PgpSecretKey
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{
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private SecretKeyPacket secret;
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private TrustPacket trust;
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private ArrayList keySigs;
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private ArrayList ids;
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private ArrayList idTrusts;
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private ArrayList idSigs;
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private PgpPublicKey pub;
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private ArrayList subSigs;
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/// <summary>Copy constructor - master key.</summary>
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private PgpSecretKey(
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SecretKeyPacket secret,
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TrustPacket trust,
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ArrayList keySigs,
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ArrayList ids,
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ArrayList idTrusts,
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ArrayList idSigs,
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PgpPublicKey pub)
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{
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this.secret = secret;
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this.trust = trust;
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this.keySigs = keySigs;
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this.ids = ids;
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this.idTrusts = idTrusts;
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this.idSigs = idSigs;
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this.pub = pub;
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}
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/// <summary>Copy constructor - subkey.</summary>
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private PgpSecretKey(
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SecretKeyPacket secret,
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TrustPacket trust,
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ArrayList subSigs,
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PgpPublicKey pub)
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{
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this.secret = secret;
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this.trust = trust;
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this.subSigs = subSigs;
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this.pub = pub;
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}
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internal PgpSecretKey(
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SecretKeyPacket secret,
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TrustPacket trust,
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ArrayList keySigs,
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ArrayList ids,
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ArrayList idTrusts,
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ArrayList idSigs)
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{
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this.secret = secret;
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this.trust = trust;
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this.keySigs = keySigs;
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this.ids = ids;
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this.idTrusts = idTrusts;
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this.idSigs = idSigs;
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this.pub = new PgpPublicKey(secret.PublicKeyPacket, trust, keySigs, ids, idTrusts, idSigs);
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}
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internal PgpSecretKey(
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SecretKeyPacket secret,
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TrustPacket trust,
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ArrayList subSigs)
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{
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this.secret = secret;
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this.trust = trust;
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this.subSigs = subSigs;
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this.pub = new PgpPublicKey(secret.PublicKeyPacket, trust, subSigs);
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}
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/// <summary>Create a subkey</summary>
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internal PgpSecretKey(
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PgpKeyPair keyPair,
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TrustPacket trust,
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ArrayList subSigs,
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SymmetricKeyAlgorithmTag encAlgorithm,
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char[] passPhrase,
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bool useSHA1,
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SecureRandom rand)
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: this(keyPair, encAlgorithm, passPhrase, useSHA1, rand)
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{
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this.secret = new SecretSubkeyPacket(
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secret.PublicKeyPacket,
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secret.EncAlgorithm,
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secret.S2kUsage,
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secret.S2k,
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secret.GetIV(),
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secret.GetSecretKeyData());
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this.trust = trust;
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this.subSigs = subSigs;
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this.pub = new PgpPublicKey(keyPair.PublicKey, trust, subSigs);
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}
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internal PgpSecretKey(
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PgpKeyPair keyPair,
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SymmetricKeyAlgorithmTag encAlgorithm,
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char[] passPhrase,
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bool useSHA1,
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SecureRandom rand)
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{
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PublicKeyPacket pubPk = keyPair.PublicKey.publicPk;
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BcpgObject secKey;
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switch (keyPair.PublicKey.Algorithm)
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{
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case PublicKeyAlgorithmTag.RsaEncrypt:
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case PublicKeyAlgorithmTag.RsaSign:
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case PublicKeyAlgorithmTag.RsaGeneral:
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RsaPrivateCrtKeyParameters rsK = (RsaPrivateCrtKeyParameters) keyPair.PrivateKey.Key;
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secKey = new RsaSecretBcpgKey(rsK.Exponent, rsK.P, rsK.Q);
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break;
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case PublicKeyAlgorithmTag.Dsa:
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DsaPrivateKeyParameters dsK = (DsaPrivateKeyParameters) keyPair.PrivateKey.Key;
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secKey = new DsaSecretBcpgKey(dsK.X);
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break;
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case PublicKeyAlgorithmTag.ElGamalEncrypt:
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case PublicKeyAlgorithmTag.ElGamalGeneral:
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ElGamalPrivateKeyParameters esK = (ElGamalPrivateKeyParameters) keyPair.PrivateKey.Key;
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secKey = new ElGamalSecretBcpgKey(esK.X);
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break;
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default:
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throw new PgpException("unknown key class");
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}
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try
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{
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MemoryStream bOut = new MemoryStream();
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BcpgOutputStream pOut = new BcpgOutputStream(bOut);
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pOut.WriteObject(secKey);
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byte[] keyData = bOut.ToArray();
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byte[] checksumBytes = Checksum(useSHA1, keyData, keyData.Length);
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pOut.Write(checksumBytes);
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byte[] bOutData = bOut.ToArray();
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if (encAlgorithm == SymmetricKeyAlgorithmTag.Null)
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{
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this.secret = new SecretKeyPacket(pubPk, encAlgorithm, null, null, bOutData);
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}
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else
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{
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S2k s2k;
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byte[] iv;
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byte[] encData = EncryptKeyData(bOutData, encAlgorithm, passPhrase, rand, out s2k, out iv);
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int usage = useSHA1
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? SecretKeyPacket.UsageSha1
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: SecretKeyPacket.UsageChecksum;
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this.secret = new SecretKeyPacket(pubPk, encAlgorithm, usage, s2k, iv, encData);
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}
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this.trust = null;
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}
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catch (PgpException e)
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{
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throw e;
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}
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catch (Exception e)
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{
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throw new PgpException("Exception encrypting key", e);
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}
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this.keySigs = new ArrayList();
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}
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public PgpSecretKey(
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int certificationLevel,
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PgpKeyPair keyPair,
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string id,
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SymmetricKeyAlgorithmTag encAlgorithm,
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char[] passPhrase,
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PgpSignatureSubpacketVector hashedPackets,
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PgpSignatureSubpacketVector unhashedPackets,
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SecureRandom rand)
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: this(certificationLevel, keyPair, id, encAlgorithm, passPhrase, false, hashedPackets, unhashedPackets, rand)
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{
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}
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public PgpSecretKey(
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int certificationLevel,
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PgpKeyPair keyPair,
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string id,
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SymmetricKeyAlgorithmTag encAlgorithm,
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char[] passPhrase,
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bool useSHA1,
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PgpSignatureSubpacketVector hashedPackets,
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PgpSignatureSubpacketVector unhashedPackets,
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SecureRandom rand)
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: this(keyPair, encAlgorithm, passPhrase, useSHA1, rand)
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{
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try
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{
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this.trust = null;
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this.ids = new ArrayList();
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ids.Add(id);
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this.idTrusts = new ArrayList();
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idTrusts.Add(null);
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this.idSigs = new ArrayList();
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PgpSignatureGenerator sGen = new PgpSignatureGenerator(
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keyPair.PublicKey.Algorithm, HashAlgorithmTag.Sha1);
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//
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// Generate the certification
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//
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sGen.InitSign(certificationLevel, keyPair.PrivateKey);
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sGen.SetHashedSubpackets(hashedPackets);
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sGen.SetUnhashedSubpackets(unhashedPackets);
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PgpSignature certification = sGen.GenerateCertification(id, keyPair.PublicKey);
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this.pub = PgpPublicKey.AddCertification(keyPair.PublicKey, id, certification);
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ArrayList sigList = new ArrayList();
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sigList.Add(certification);
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idSigs.Add(sigList);
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}
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catch (PgpException e)
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{
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throw e;
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}
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catch (Exception e)
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{
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throw new PgpException("Exception encrypting key", e);
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}
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}
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public PgpSecretKey(
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int certificationLevel,
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PublicKeyAlgorithmTag algorithm,
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AsymmetricKeyParameter pubKey,
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AsymmetricKeyParameter privKey,
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DateTime time,
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string id,
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SymmetricKeyAlgorithmTag encAlgorithm,
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char[] passPhrase,
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PgpSignatureSubpacketVector hashedPackets,
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PgpSignatureSubpacketVector unhashedPackets,
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SecureRandom rand)
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: this(certificationLevel,
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new PgpKeyPair(algorithm, pubKey, privKey, time),
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id, encAlgorithm, passPhrase, hashedPackets, unhashedPackets, rand)
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{
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}
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public PgpSecretKey(
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int certificationLevel,
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PublicKeyAlgorithmTag algorithm,
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AsymmetricKeyParameter pubKey,
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AsymmetricKeyParameter privKey,
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DateTime time,
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string id,
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SymmetricKeyAlgorithmTag encAlgorithm,
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char[] passPhrase,
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bool useSHA1,
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PgpSignatureSubpacketVector hashedPackets,
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PgpSignatureSubpacketVector unhashedPackets,
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SecureRandom rand)
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: this(certificationLevel, new PgpKeyPair(algorithm, pubKey, privKey, time), id, encAlgorithm, passPhrase, useSHA1, hashedPackets, unhashedPackets, rand)
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{
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}
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/// <summary>
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/// Check if this key has an algorithm type that makes it suitable to use for signing.
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/// </summary>
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/// <remarks>
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/// Note: with version 4 keys KeyFlags subpackets should also be considered when present for
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/// determining the preferred use of the key.
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/// </remarks>
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/// <returns>
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/// <c>true</c> if this key algorithm is suitable for use with signing.
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/// </returns>
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public bool IsSigningKey
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{
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get
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{
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switch (pub.Algorithm)
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{
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case PublicKeyAlgorithmTag.RsaGeneral:
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case PublicKeyAlgorithmTag.RsaSign:
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case PublicKeyAlgorithmTag.Dsa:
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case PublicKeyAlgorithmTag.ECDsa:
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case PublicKeyAlgorithmTag.ElGamalGeneral:
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return true;
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default:
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return false;
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}
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}
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}
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/// <summary>True, if this is a master key.</summary>
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public bool IsMasterKey
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{
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get { return subSigs == null; }
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}
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/// <summary>The algorithm the key is encrypted with.</summary>
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public SymmetricKeyAlgorithmTag KeyEncryptionAlgorithm
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{
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get { return secret.EncAlgorithm; }
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}
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/// <summary>The key ID of the public key associated with this key.</summary>
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public long KeyId
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{
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get { return pub.KeyId; }
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}
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/// <summary>The public key associated with this key.</summary>
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public PgpPublicKey PublicKey
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{
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get { return pub; }
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}
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/// <summary>Allows enumeration of any user IDs associated with the key.</summary>
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/// <returns>An <c>IEnumerable</c> of <c>string</c> objects.</returns>
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public IEnumerable UserIds
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{
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get { return pub.GetUserIds(); }
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}
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/// <summary>Allows enumeration of any user attribute vectors associated with the key.</summary>
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/// <returns>An <c>IEnumerable</c> of <c>string</c> objects.</returns>
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public IEnumerable UserAttributes
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{
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get { return pub.GetUserAttributes(); }
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}
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private byte[] ExtractKeyData(
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char[] passPhrase)
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{
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SymmetricKeyAlgorithmTag alg = secret.EncAlgorithm;
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byte[] encData = secret.GetSecretKeyData();
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if (alg == SymmetricKeyAlgorithmTag.Null)
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return encData;
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byte[] data;
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IBufferedCipher c = null;
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try
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{
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string cName = PgpUtilities.GetSymmetricCipherName(alg);
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c = CipherUtilities.GetCipher(cName + "/CFB/NoPadding");
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}
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catch (Exception e)
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{
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throw new PgpException("Exception creating cipher", e);
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}
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// TODO Factor this block out as 'encryptData'
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try
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{
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KeyParameter key = PgpUtilities.MakeKeyFromPassPhrase(secret.EncAlgorithm, secret.S2k, passPhrase);
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byte[] iv = secret.GetIV();
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if (secret.PublicKeyPacket.Version == 4)
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{
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c.Init(false, new ParametersWithIV(key, iv));
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data = c.DoFinal(encData);
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bool useSHA1 = secret.S2kUsage == SecretKeyPacket.UsageSha1;
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byte[] check = Checksum(useSHA1, data, (useSHA1) ? data.Length - 20 : data.Length - 2);
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for (int i = 0; i != check.Length; i++)
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{
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if (check[i] != data[data.Length - check.Length + i])
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{
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throw new PgpException("Checksum mismatch at " + i + " of " + check.Length);
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}
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}
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}
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else // version 2 or 3, RSA only.
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{
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data = new byte[encData.Length];
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//
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// read in the four numbers
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//
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int pos = 0;
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for (int i = 0; i != 4; i++)
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{
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c.Init(false, new ParametersWithIV(key, iv));
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int encLen = (((encData[pos] << 8) | (encData[pos + 1] & 0xff)) + 7) / 8;
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data[pos] = encData[pos];
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data[pos + 1] = encData[pos + 1];
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pos += 2;
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c.DoFinal(encData, pos, encLen, data, pos);
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pos += encLen;
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if (i != 3)
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{
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Array.Copy(encData, pos - iv.Length, iv, 0, iv.Length);
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}
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}
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//
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// verify Checksum
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//
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int cs = ((encData[pos] << 8) & 0xff00) | (encData[pos + 1] & 0xff);
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int calcCs = 0;
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for (int j=0; j < data.Length-2; j++)
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{
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calcCs += data[j] & 0xff;
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}
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calcCs &= 0xffff;
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if (calcCs != cs)
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{
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throw new PgpException("Checksum mismatch: passphrase wrong, expected "
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+ cs.ToString("X")
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+ " found " + calcCs.ToString("X"));
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}
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}
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return data;
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}
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catch (PgpException e)
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{
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throw e;
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}
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catch (Exception e)
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{
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throw new PgpException("Exception decrypting key", e);
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}
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}
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/// <summary>Extract a <c>PgpPrivateKey</c> from this secret key's encrypted contents.</summary>
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public PgpPrivateKey ExtractPrivateKey(
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char[] passPhrase)
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{
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byte[] secKeyData = secret.GetSecretKeyData();
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if (secKeyData == null || secKeyData.Length < 1)
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return null;
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PublicKeyPacket pubPk = secret.PublicKeyPacket;
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try
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{
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byte[] data = ExtractKeyData(passPhrase);
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BcpgInputStream bcpgIn = BcpgInputStream.Wrap(new MemoryStream(data, false));
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AsymmetricKeyParameter privateKey;
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switch (pubPk.Algorithm)
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{
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case PublicKeyAlgorithmTag.RsaEncrypt:
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case PublicKeyAlgorithmTag.RsaGeneral:
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case PublicKeyAlgorithmTag.RsaSign:
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RsaPublicBcpgKey rsaPub = (RsaPublicBcpgKey)pubPk.Key;
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RsaSecretBcpgKey rsaPriv = new RsaSecretBcpgKey(bcpgIn);
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RsaPrivateCrtKeyParameters rsaPrivSpec = new RsaPrivateCrtKeyParameters(
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rsaPriv.Modulus,
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rsaPub.PublicExponent,
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rsaPriv.PrivateExponent,
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rsaPriv.PrimeP,
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rsaPriv.PrimeQ,
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rsaPriv.PrimeExponentP,
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rsaPriv.PrimeExponentQ,
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rsaPriv.CrtCoefficient);
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privateKey = rsaPrivSpec;
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break;
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case PublicKeyAlgorithmTag.Dsa:
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DsaPublicBcpgKey dsaPub = (DsaPublicBcpgKey)pubPk.Key;
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DsaSecretBcpgKey dsaPriv = new DsaSecretBcpgKey(bcpgIn);
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DsaParameters dsaParams = new DsaParameters(dsaPub.P, dsaPub.Q, dsaPub.G);
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privateKey = new DsaPrivateKeyParameters(dsaPriv.X, dsaParams);
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break;
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case PublicKeyAlgorithmTag.ElGamalEncrypt:
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case PublicKeyAlgorithmTag.ElGamalGeneral:
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ElGamalPublicBcpgKey elPub = (ElGamalPublicBcpgKey)pubPk.Key;
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ElGamalSecretBcpgKey elPriv = new ElGamalSecretBcpgKey(bcpgIn);
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ElGamalParameters elParams = new ElGamalParameters(elPub.P, elPub.G);
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privateKey = new ElGamalPrivateKeyParameters(elPriv.X, elParams);
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break;
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default:
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throw new PgpException("unknown public key algorithm encountered");
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}
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return new PgpPrivateKey(privateKey, KeyId);
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}
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catch (PgpException e)
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{
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throw e;
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}
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catch (Exception e)
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{
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throw new PgpException("Exception constructing key", e);
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}
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}
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private static byte[] Checksum(
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bool useSHA1,
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byte[] bytes,
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int length)
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{
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if (useSHA1)
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{
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try
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{
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IDigest dig = DigestUtilities.GetDigest("SHA1");
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dig.BlockUpdate(bytes, 0, length);
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return DigestUtilities.DoFinal(dig);
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}
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//catch (NoSuchAlgorithmException e)
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catch (Exception e)
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{
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throw new PgpException("Can't find SHA-1", e);
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}
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}
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else
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{
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int Checksum = 0;
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for (int i = 0; i != length; i++)
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{
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Checksum += bytes[i];
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}
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return new byte[] { (byte)(Checksum >> 8), (byte)Checksum };
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}
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}
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public byte[] GetEncoded()
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{
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MemoryStream bOut = new MemoryStream();
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Encode(bOut);
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return bOut.ToArray();
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}
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public void Encode(
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Stream outStr)
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{
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BcpgOutputStream bcpgOut = BcpgOutputStream.Wrap(outStr);
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bcpgOut.WritePacket(secret);
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|
if (trust != null)
|
|
{
|
|
bcpgOut.WritePacket(trust);
|
|
}
|
|
|
|
if (subSigs == null) // is not a sub key
|
|
{
|
|
foreach (PgpSignature keySig in keySigs)
|
|
{
|
|
keySig.Encode(bcpgOut);
|
|
}
|
|
|
|
for (int i = 0; i != ids.Count; i++)
|
|
{
|
|
if (ids[i] is string)
|
|
{
|
|
string id = (string) ids[i];
|
|
|
|
bcpgOut.WritePacket(new UserIdPacket(id));
|
|
}
|
|
else
|
|
{
|
|
PgpUserAttributeSubpacketVector v = (PgpUserAttributeSubpacketVector)ids[i];
|
|
bcpgOut.WritePacket(new UserAttributePacket(v.ToSubpacketArray()));
|
|
}
|
|
|
|
if (idTrusts[i] != null)
|
|
{
|
|
bcpgOut.WritePacket((ContainedPacket)idTrusts[i]);
|
|
}
|
|
|
|
foreach (PgpSignature sig in (ArrayList) idSigs[i])
|
|
{
|
|
sig.Encode(bcpgOut);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
foreach (PgpSignature subSig in 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>
|
|
/// <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)
|
|
{
|
|
byte[] rawKeyData = key.ExtractKeyData(oldPassPhrase);
|
|
int s2kUsage = key.secret.S2kUsage;
|
|
byte[] iv = null;
|
|
S2k s2k = null;
|
|
byte[] keyData;
|
|
|
|
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
|
|
{
|
|
try
|
|
{
|
|
keyData = EncryptKeyData(rawKeyData, newEncAlgorithm, newPassPhrase, 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(key.secret.PublicKeyPacket,
|
|
newEncAlgorithm, s2kUsage, s2k, iv, keyData);
|
|
}
|
|
else
|
|
{
|
|
secret = new SecretKeyPacket(key.secret.PublicKeyPacket,
|
|
newEncAlgorithm, s2kUsage, s2k, iv, keyData);
|
|
}
|
|
|
|
if (key.subSigs == null)
|
|
{
|
|
return new PgpSecretKey(secret, key.trust, key.keySigs, key.ids,
|
|
key.idTrusts, key.idSigs, key.pub);
|
|
}
|
|
|
|
return new PgpSecretKey(secret, key.trust, key.subSigs, key.pub);
|
|
}
|
|
|
|
private static byte[] EncryptKeyData(
|
|
byte[] rawKeyData,
|
|
SymmetricKeyAlgorithmTag encAlgorithm,
|
|
char[] passPhrase,
|
|
SecureRandom random,
|
|
out S2k s2k,
|
|
out byte[] iv)
|
|
{
|
|
IBufferedCipher c;
|
|
try
|
|
{
|
|
string cName = PgpUtilities.GetSymmetricCipherName(encAlgorithm);
|
|
c = CipherUtilities.GetCipher(cName + "/CFB/NoPadding");
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
throw new PgpException("Exception creating cipher", e);
|
|
}
|
|
|
|
byte[] s2kIV = new byte[8];
|
|
random.NextBytes(s2kIV);
|
|
s2k = new S2k(HashAlgorithmTag.Sha1, s2kIV, 0x60);
|
|
|
|
KeyParameter kp = PgpUtilities.MakeKeyFromPassPhrase(encAlgorithm, s2k, passPhrase);
|
|
|
|
iv = new byte[c.GetBlockSize()];
|
|
random.NextBytes(iv);
|
|
|
|
c.Init(true, new ParametersWithRandom(new ParametersWithIV(kp, iv), random));
|
|
|
|
return c.DoFinal(rawKeyData);
|
|
}
|
|
}
|
|
}
|