/// <summary>
/// Finds a subkey (or the primary key) with the given keyid
/// and returns it. Returns null if the the fitting key has
/// not been found.
/// </summary>
/// <remarks>If the public key has been revoked, it is ignored
/// and NOT found by this function!!!</remarks>
/// <param name="lKeyID">The keyid to be sought in the transportable
/// public key.</param>
/// <returns>The subkey (or the primary key) with the given keyid.
/// Null if the the fitting key has not been found.</returns>
public PublicKeyPacket FindKey(ulong lKeyID)
{
if (pkpPrimaryKey.KeyID == lKeyID)
{
return(pkpPrimaryKey);
}
IEnumerator ieSubkeys = alSubkeys.GetEnumerator();
while (ieSubkeys.MoveNext())
{
CertifiedPublicSubkey cpsKey = (CertifiedPublicSubkey)ieSubkeys.Current;
// The subkey has been revoced
if (cpsKey.RevocationSignature != null)
{
continue;
}
PublicKeyPacket pkpKey = cpsKey.Subkey;
if (pkpKey.KeyID == lKeyID)
{
return(pkpKey);
}
}
return(null);
}
/// <summary>
/// Generates a subkey for the specified primary key pair
/// </summary>
/// <param name="iKeySize">size of the subkey</param>
/// <param name="strPassphrase">passphrase for the primar secret key</param>
/// <param name="PrimaryKeyID">primary key pair keyID</param>
/// <param name="expirationTime">expiration time for the subkey (new DateTime(0) == never)</param>
/// <param name="isRevocableSubkey">is revocable?</param>
public void GenerateSubkey(int iKeySize, string strPassphrase, ulong PrimaryKeyID, DateTime expirationTime, bool isRevocableSubkey)
{
if (iKeySize % 1024 != 0)
throw new Exception("Keysize must be a 1024 multiple");
TransportablePublicKey tpkKey = this.PublicRing.Find(PrimaryKeyID,false);
TransportableSecretKey tskKey = this.SecretRing.Find(PrimaryKeyID);
System.Security.Cryptography.RandomNumberGenerator rngRand;
BigInteger[][] biEncryptionKey = GenerateElGamalEncryptionKey(iKeySize);
PublicKeyPacket pkpEncryptionKey = new PublicKeyPacket(true);
pkpEncryptionKey.Algorithm = AsymAlgorithms.ElGamal_Encrypt_Only;
pkpEncryptionKey.KeyMaterial = biEncryptionKey[0];
pkpEncryptionKey.TimeCreated = DateTime.Now;
pkpEncryptionKey.Version = PublicKeyPacketVersionNumbers.v4;
SecretKeyPacket skpEncryptionKey = new SecretKeyPacket(true);
skpEncryptionKey.SymmetricalAlgorithm = SymAlgorithms.AES256;
skpEncryptionKey.PublicKey = pkpEncryptionKey;
skpEncryptionKey.InitialVector = new byte[CipherHelper.CipherBlockSize(SymAlgorithms.AES256)];
rngRand = System.Security.Cryptography.RandomNumberGenerator.Create();
rngRand.GetBytes(skpEncryptionKey.InitialVector);
skpEncryptionKey.EncryptKeyMaterial(biEncryptionKey[1], strPassphrase);
skpEncryptionKey.PublicKey = pkpEncryptionKey;
CertifiedPublicSubkey cpsEncryptionKey = new CertifiedPublicSubkey();
cpsEncryptionKey.Subkey = pkpEncryptionKey;
cpsEncryptionKey.SignKeyBindingSignature(tpkKey.PrimaryKey, tskKey.PrimaryKey, strPassphrase, expirationTime, isRevocableSubkey);
tpkKey.SubKeys.Add(cpsEncryptionKey);
this.PublicRing.AddPublicKey(tpkKey);
tskKey.SubKeys.Add(skpEncryptionKey);
this.SecretRing.AddSecretKey(tskKey);
}
/// <summary>
/// Generate a key pair
/// </summary>
/// <param name="iKeySize">Encription key size</param>
/// <param name="strPassphrase">passhrase for the key pair</param>
/// <param name="userID">primary user id</param>
/// <param name="email">user email</param>
/// <param name="notation">xml encoded user info</param>
/// <param name="expirationTime">expiration date of the primary key (new DateTime(0) == never)</param>
/// <param name="keyType">1: RSA/DSA 0:Elgamal/DSA(DEFAULT)</param>
/// <param name="isRevocableKey">revocable?</param>
/// <param name="isRevocableSubkey">revocable subkey?</param>
public void GenerateKey(int iKeySize, string strPassphrase, string userID, string email, string notation, DateTime expirationTime, int keyType, bool isRevocableKey, bool isRevocableSubkey)
{
if(iKeySize % 1024 != 0)
throw new Exception("Keysize must be a 1024 multiple");
System.Security.Cryptography.RandomNumberGenerator rngRand;
// let's first create the encryption key
BigInteger[][] biEncryptionKey;
if (keyType == 1) {
// it's a RSA/DSA key
biEncryptionKey = GenerateRSAEncryptionKey(iKeySize);
} else {
// it's an elgamal/DSA key DEFAULF
biEncryptionKey = GenerateElGamalEncryptionKey(iKeySize);
}
// now the signature key
BigInteger[][] biSignatureKey = GenerateDSASignatureKey();
PublicKeyPacket pkpSignatureKey = new PublicKeyPacket(false);
pkpSignatureKey.Algorithm = AsymAlgorithms.DSA;
pkpSignatureKey.KeyMaterial = biSignatureKey[0];
pkpSignatureKey.TimeCreated = DateTime.Now;
pkpSignatureKey.Version = PublicKeyPacketVersionNumbers.v4;
SecretKeyPacket skpSignatureKey = new SecretKeyPacket(false);
skpSignatureKey.SymmetricalAlgorithm = SymAlgorithms.AES256;
skpSignatureKey.PublicKey = pkpSignatureKey;
skpSignatureKey.InitialVector = new byte[CipherHelper.CipherBlockSize(SymAlgorithms.AES256)];
rngRand = System.Security.Cryptography.RandomNumberGenerator.Create();
rngRand.GetBytes(skpSignatureKey.InitialVector);
skpSignatureKey.EncryptKeyMaterial(biSignatureKey[1], strPassphrase);
skpSignatureKey.PublicKey = pkpSignatureKey;
PublicKeyPacket pkpEncryptionKey = new PublicKeyPacket(true);
if (keyType == 0) {
// it's an elgamal/DSA key
pkpEncryptionKey.Algorithm = AsymAlgorithms.ElGamal_Encrypt_Only;
} else if (keyType == 1) {
// it's a RSA/DSA key
pkpEncryptionKey.Algorithm = AsymAlgorithms.RSA_Encrypt_Only;
}
pkpEncryptionKey.KeyMaterial = biEncryptionKey[0];
pkpEncryptionKey.TimeCreated = DateTime.Now;
pkpEncryptionKey.Version = PublicKeyPacketVersionNumbers.v4;
SecretKeyPacket skpEncryptionKey = new SecretKeyPacket(true);
skpEncryptionKey.SymmetricalAlgorithm = SymAlgorithms.AES256;
skpEncryptionKey.PublicKey = pkpEncryptionKey;
skpEncryptionKey.InitialVector = new byte[CipherHelper.CipherBlockSize(SymAlgorithms.AES256)];
rngRand = System.Security.Cryptography.RandomNumberGenerator.Create();
rngRand.GetBytes(skpEncryptionKey.InitialVector);
skpEncryptionKey.EncryptKeyMaterial(biEncryptionKey[1], strPassphrase);
skpEncryptionKey.PublicKey = pkpEncryptionKey;
CertifiedUserID cuiUID = new CertifiedUserID();
UserIDPacket uipUID = new UserIDPacket();
uipUID.UserID = userID.Trim() + " <" + email.Trim() + ">";
cuiUID.UserID = uipUID;
SignaturePacket spSelfSig = new SignaturePacket();
if (notation != null) {
SignatureSubPacket sspNotation = new SignatureSubPacket();
sspNotation.Type = SignatureSubPacketTypes.NotationData;
sspNotation.NotationName = "PersonalData";
sspNotation.NotationValue = notation;
spSelfSig.AddSubPacket(sspNotation,false);
}
if (expirationTime.Ticks != 0) {
SignatureSubPacket sspExpiration = new SignatureSubPacket();
sspExpiration.Type = SignatureSubPacketTypes.KeyExpirationTime;
sspExpiration.KeyExpirationTime = new DateTime(expirationTime.Ticks + (new DateTime(1970,1,2)).Ticks - pkpEncryptionKey.TimeCreated.Ticks);
spSelfSig.AddSubPacket(sspExpiration, true);
}
if (!isRevocableKey) {
SignatureSubPacket sspRevocable = new SignatureSubPacket();
sspRevocable.Type = SignatureSubPacketTypes.Revocable;
sspRevocable.Revocable = isRevocableKey;
spSelfSig.AddSubPacket(sspRevocable, true);
}
SignatureSubPacket sspPrimaryUID = new SignatureSubPacket();
sspPrimaryUID.Type = SignatureSubPacketTypes.PrimaryUserID;
sspPrimaryUID.Revocable = true;
spSelfSig.AddSubPacket(sspPrimaryUID, true);
spSelfSig.Version = SignaturePacketVersionNumbers.v4;
spSelfSig.HashAlgorithm = HashAlgorithms.SHA1;
spSelfSig.KeyID = pkpSignatureKey.KeyID;
spSelfSig.TimeCreated = DateTime.Now;
SignatureSubPacket sspPrimaryUserID = new SignatureSubPacket();
sspPrimaryUserID.Type = SignatureSubPacketTypes.PrimaryUserID;
sspPrimaryUserID.PrimaryUserID = true;
spSelfSig.AddSubPacket(sspPrimaryUserID, true);
SignatureSubPacket sspPreferedSymAlgos = new SignatureSubPacket();
sspPreferedSymAlgos.Type = SignatureSubPacketTypes.PreferedSymmetricAlgorithms;
sspPreferedSymAlgos.PreferedSymAlgos = new SymAlgorithms[] {SymAlgorithms.AES256, SymAlgorithms.AES192, SymAlgorithms.AES256, SymAlgorithms.CAST5, SymAlgorithms.Triple_DES};
spSelfSig.AddSubPacket(sspPreferedSymAlgos, true);
SignatureSubPacket sspPreferedHashAlgos = new SignatureSubPacket();
sspPreferedHashAlgos.Type = SignatureSubPacketTypes.PreferedHashAlgorithms;
sspPreferedHashAlgos.PreferedHashAlgos = new HashAlgorithms[] {HashAlgorithms.SHA1};
spSelfSig.AddSubPacket(sspPreferedHashAlgos, true);
cuiUID.Certificates = new System.Collections.ArrayList();
cuiUID.Sign(spSelfSig, skpSignatureKey, strPassphrase, pkpSignatureKey);
CertifiedPublicSubkey cpsEncryptionKey = new CertifiedPublicSubkey();
cpsEncryptionKey.Subkey = pkpEncryptionKey;
cpsEncryptionKey.SignKeyBindingSignature(pkpSignatureKey, skpSignatureKey, strPassphrase, expirationTime, isRevocableSubkey);
TransportablePublicKey tpkPublicKey = new TransportablePublicKey();
tpkPublicKey.PrimaryKey = pkpSignatureKey;
tpkPublicKey.SubKeys.Add(cpsEncryptionKey);
tpkPublicKey.Certifications.Add(cuiUID);
this.PublicRing.AddPublicKey(tpkPublicKey);
TransportableSecretKey tskSecretKey = new TransportableSecretKey();
tskSecretKey.PrimaryKey = skpSignatureKey;
tskSecretKey.SubKeys.Add(skpEncryptionKey);
tskSecretKey.UserIDs.Add(uipUID);
this.SecretRing.AddSecretKey(tskSecretKey);
}
/// <summary>
/// Parses the radix64 encoded representation of a transportable public
/// key given as an argument to populate the parameters of this.
/// </summary>
/// <remarks>No remarks</remarks>
/// <param name="strRadix64">Radix64 representation of an transportable
/// public key</param>
/// <exception cref="System.ArgumentException">Throws an
/// ArgumentException if the radix64 string given as a parameter is
/// not an transportable public key.</exception>
public void Parse(string strRadix64)
{
Packet[] pPackets = Packet.ParsePackets(strRadix64);
int nCurrentPacket = 0;
int nUserIDCounter = 0;
try {
// First we expect a PublicKeyPacket
if (!(pPackets[0] is PublicKeyPacket))
throw(new ArgumentException("The given packet is not in the required transportable public key format (packet 0 should have been public key packet)!"));
this.PrimaryKey = (PublicKeyPacket)pPackets[nCurrentPacket++];
// Next we expect zero or more revocation signatures
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is SignaturePacket)) {
SignaturePacket spRevocation = (SignaturePacket)pPackets[nCurrentPacket++];
if (spRevocation.SignatureType == SignatureTypes.KeyRevocationSignature) {
this.RevocationSignatures.Add(spRevocation);
} else if(spRevocation.SignatureType == SignatureTypes.KeySignature) {
this.RevocationKeys.Add(spRevocation);
} else
throw(new ArgumentException("The given packet is not in the required transportable public key format (expected zero or more revocation signatures, was: " + spRevocation.SignatureType + ")!"));
}
// Next in queue must be one or more UserID Packets
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is UserIDPacket)) {
nUserIDCounter++;
CertifiedUserID cuiUserID = new CertifiedUserID();
UserIDPacket uipUserID = (UserIDPacket)pPackets[nCurrentPacket++];
cuiUserID.UserID = uipUserID;
// For every UserIDPacket we expect zero or more Signatures (Certificates)
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is SignaturePacket)) {
SignaturePacket spCertificate = (SignaturePacket)pPackets[nCurrentPacket++];
if ((spCertificate.SignatureType != SignatureTypes.UserIDSignature) &&
(spCertificate.SignatureType != SignatureTypes.UserIDSignature_CasualVerification) &&
(spCertificate.SignatureType != SignatureTypes.UserIDSignature_NoVerification) &&
(spCertificate.SignatureType != SignatureTypes.UserIDSignature_PositivVerification) &&
(spCertificate.SignatureType != SignatureTypes.CertificationRevocationSignature)) {
throw(new ArgumentException("The given packet is not in the required transportable public key format (expected zero or more Signatures/Certificates)!"));
}
cuiUserID.Certificates.Add(spCertificate);
}
this.Certifications.Add(cuiUserID);
}
// There was no UserIDPacket. This is fatal!!!
if (nUserIDCounter == 0) {
throw(new ArgumentException("The given packet is not in the required transportable public key format (there was no UserIDPacket)!"));
}
// Finally we have zero or more subkeys
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is PublicKeyPacket)) {
PublicKeyPacket pkpSubKey = (PublicKeyPacket)pPackets[nCurrentPacket++];
CertifiedPublicSubkey cpsSubKey = new CertifiedPublicSubkey();
cpsSubKey.Subkey = pkpSubKey;
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is SignaturePacket)) {
SignaturePacket spKeySignature = (SignaturePacket)pPackets[nCurrentPacket++];
if (spKeySignature.SignatureType == SignatureTypes.SubkeyBindingSignature) {
cpsSubKey.KeyBindingSignature = spKeySignature;
} else if (spKeySignature.SignatureType == SignatureTypes.SubkeyRevocationSignature) {
cpsSubKey.RevocationSignature = spKeySignature;
}
}
if (nCurrentPacket < pPackets.Length) {
if (!(pPackets[nCurrentPacket] is PublicKeyPacket)) {
throw(new ArgumentException("The given packet is not in the required transportable public key format (expected public subkey packet)!"));
}
}
/*
if (nCurrentPacket < pPackets.Length) {
if (pPackets[nCurrentPacket] is SignaturePacket) {
SignaturePacket spSubkeyRev = (SignaturePacket)pPackets[nCurrentPacket++];
cpsSubKey.RevocationSignature = spSubkeyRev;
}
}
*/
this.SubKeys.Add(cpsSubKey);
}
} catch (System.IndexOutOfRangeException) {
if (nUserIDCounter == 0) {
throw(new ArgumentException("The given packet is not in the required transportable public key format (no userid packet found)!"));
}
}
}
public void GenerateKey(string strName, string strEmail, string strKeyType, int iKeySize, long lExpiration, string strPassphrase)
{
if (strKeyType == "ElGamal/DSA") {
System.Security.Cryptography.RandomNumberGenerator rngRand = System.Security.Cryptography.RandomNumberGenerator.Create();
// let's first create the encryption key
BigInteger[][] biEncryptionKey = GenerateEncryptionKey(iKeySize);
// now the signature key
BigInteger[][] biSignatureKey = GenerateSignatureKey();
PublicKeyPacket pkpSignatureKey = new PublicKeyPacket(false);
pkpSignatureKey.Algorithm = AsymAlgorithms.DSA;
pkpSignatureKey.KeyMaterial = biSignatureKey[0];
pkpSignatureKey.TimeCreated = DateTime.Now;
pkpSignatureKey.Version = PublicKeyPacketVersionNumbers.v4;
SecretKeyPacket skpSignatureKey = new SecretKeyPacket(false);
skpSignatureKey.SymmetricalAlgorithm = SymAlgorithms.AES256;
skpSignatureKey.PublicKey = pkpSignatureKey;
skpSignatureKey.InitialVector = new byte[CipherHelper.CipherBlockSize(SymAlgorithms.AES256)];
rngRand.GetBytes(skpSignatureKey.InitialVector);
skpSignatureKey.EncryptKeyMaterial(biSignatureKey[1], strPassphrase);
skpSignatureKey.PublicKey = pkpSignatureKey;
PublicKeyPacket pkpEncryptionKey = new PublicKeyPacket(true);
pkpEncryptionKey.Algorithm = AsymAlgorithms.ElGamal_Encrypt_Only;
pkpEncryptionKey.KeyMaterial = biEncryptionKey[0];
pkpEncryptionKey.TimeCreated = DateTime.Now;
pkpEncryptionKey.Version = PublicKeyPacketVersionNumbers.v4;
SecretKeyPacket skpEncryptionKey = new SecretKeyPacket(true);
skpEncryptionKey.SymmetricalAlgorithm = SymAlgorithms.AES256;
skpEncryptionKey.PublicKey = pkpEncryptionKey;
skpEncryptionKey.InitialVector = new byte[CipherHelper.CipherBlockSize(SymAlgorithms.AES256)];
rngRand.GetBytes(skpEncryptionKey.InitialVector);
skpEncryptionKey.EncryptKeyMaterial(biEncryptionKey[1], strPassphrase);
skpEncryptionKey.PublicKey = pkpEncryptionKey;
CertifiedUserID cuiUID = new CertifiedUserID();
UserIDPacket uipUID = new UserIDPacket();
uipUID.UserID = strName.Trim() + " <" + strEmail.Trim() + ">";
cuiUID.UserID = uipUID;
SignaturePacket spSelfSig = new SignaturePacket();
spSelfSig.Version = SignaturePacketVersionNumbers.v4;
spSelfSig.HashAlgorithm = HashAlgorithms.SHA1;
spSelfSig.KeyID = pkpSignatureKey.KeyID;
spSelfSig.TimeCreated = DateTime.Now;
SignatureSubPacket sspPrimaryUserID = new SignatureSubPacket();
sspPrimaryUserID.Type = SignatureSubPacketTypes.PrimaryUserID;
sspPrimaryUserID.PrimaryUserID = true;
spSelfSig.AddSubPacket(sspPrimaryUserID, true);
SignatureSubPacket sspPreferedSymAlgos = new SignatureSubPacket();
sspPreferedSymAlgos.Type = SignatureSubPacketTypes.PreferedSymmetricAlgorithms;
sspPreferedSymAlgos.PreferedSymAlgos = new SymAlgorithms[] {SymAlgorithms.AES256, SymAlgorithms.AES192, SymAlgorithms.AES256, SymAlgorithms.CAST5, SymAlgorithms.Triple_DES};
spSelfSig.AddSubPacket(sspPreferedSymAlgos, true);
SignatureSubPacket sspPreferedHashAlgos = new SignatureSubPacket();
sspPreferedHashAlgos.Type = SignatureSubPacketTypes.PreferedHashAlgorithms;
sspPreferedHashAlgos.PreferedHashAlgos = new HashAlgorithms[] {HashAlgorithms.SHA1};
spSelfSig.AddSubPacket(sspPreferedHashAlgos, true);
if (lExpiration != 0) {
SignatureSubPacket sspExpiration = new SignatureSubPacket();
sspExpiration.Type = SignatureSubPacketTypes.SignatureExpirationTime;
sspExpiration.SignatureExpirationTime = new DateTime(lExpiration);
spSelfSig.AddSubPacket(sspExpiration, true);
}
cuiUID.Certificates = new System.Collections.ArrayList();
cuiUID.Sign(spSelfSig, skpSignatureKey, strPassphrase, pkpSignatureKey);
CertifiedPublicSubkey cpsEncryptionKey = new CertifiedPublicSubkey();
cpsEncryptionKey.Subkey = pkpEncryptionKey;
cpsEncryptionKey.SignKeyBindingSignature(pkpSignatureKey, skpSignatureKey, strPassphrase, new DateTime(lExpiration), true);
TransportablePublicKey tpkPublicKey = new TransportablePublicKey();
tpkPublicKey.PrimaryKey = pkpSignatureKey;
tpkPublicKey.SubKeys.Add(cpsEncryptionKey);
tpkPublicKey.Certifications.Add(cuiUID);
TransportableSecretKey tskSecretKey = new TransportableSecretKey();
tskSecretKey.PrimaryKey = skpSignatureKey;
tskSecretKey.SubKeys.Add(skpEncryptionKey);
tskSecretKey.UserIDs.Add(uipUID);
this.pkrKeyRing.AddPublicKey(tpkPublicKey);
this.skrKeyRing.AddSecretKey(tskSecretKey);
pkrKeyRing.Save();
skrKeyRing.Save();
// it's an RSA key
} else if (strKeyType == "RSA") {
}
}
/// <summary>
/// Parses the radix64 encoded representation of a transportable public
/// key given as an argument to populate the parameters of this.
/// </summary>
/// <remarks>No remarks</remarks>
/// <param name="strRadix64">Radix64 representation of an transportable
/// public key</param>
/// <exception cref="System.ArgumentException">Throws an
/// ArgumentException if the radix64 string given as a parameter is
/// not an transportable public key.</exception>
public void Parse(string strRadix64)
{
Packet[] pPackets = Packet.ParsePackets(strRadix64);
int nCurrentPacket = 0;
int nUserIDCounter = 0;
try {
// First we expect a PublicKeyPacket
if (!(pPackets[0] is PublicKeyPacket))
{
throw(new ArgumentException("The given packet is not in the required transportable public key format (packet 0 should have been public key packet)!"));
}
this.PrimaryKey = (PublicKeyPacket)pPackets[nCurrentPacket++];
// Next we expect zero or more revocation signatures
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is SignaturePacket))
{
SignaturePacket spRevocation = (SignaturePacket)pPackets[nCurrentPacket++];
if (spRevocation.SignatureType == SignatureTypes.KeyRevocationSignature)
{
this.RevocationSignatures.Add(spRevocation);
}
else if (spRevocation.SignatureType == SignatureTypes.KeySignature)
{
this.RevocationKeys.Add(spRevocation);
}
else
{
throw(new ArgumentException("The given packet is not in the required transportable public key format (expected zero or more revocation signatures, was: " + spRevocation.SignatureType + ")!"));
}
}
// Next in queue must be one or more UserID Packets
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is UserIDPacket))
{
nUserIDCounter++;
CertifiedUserID cuiUserID = new CertifiedUserID();
UserIDPacket uipUserID = (UserIDPacket)pPackets[nCurrentPacket++];
cuiUserID.UserID = uipUserID;
// For every UserIDPacket we expect zero or more Signatures (Certificates)
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is SignaturePacket))
{
SignaturePacket spCertificate = (SignaturePacket)pPackets[nCurrentPacket++];
if ((spCertificate.SignatureType != SignatureTypes.UserIDSignature) &&
(spCertificate.SignatureType != SignatureTypes.UserIDSignature_CasualVerification) &&
(spCertificate.SignatureType != SignatureTypes.UserIDSignature_NoVerification) &&
(spCertificate.SignatureType != SignatureTypes.UserIDSignature_PositivVerification) &&
(spCertificate.SignatureType != SignatureTypes.CertificationRevocationSignature))
{
throw(new ArgumentException("The given packet is not in the required transportable public key format (expected zero or more Signatures/Certificates)!"));
}
cuiUserID.Certificates.Add(spCertificate);
}
this.Certifications.Add(cuiUserID);
}
// There was no UserIDPacket. This is fatal!!!
if (nUserIDCounter == 0)
{
throw(new ArgumentException("The given packet is not in the required transportable public key format (there was no UserIDPacket)!"));
}
// Finally we have zero or more subkeys
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is PublicKeyPacket))
{
PublicKeyPacket pkpSubKey = (PublicKeyPacket)pPackets[nCurrentPacket++];
CertifiedPublicSubkey cpsSubKey = new CertifiedPublicSubkey();
cpsSubKey.Subkey = pkpSubKey;
while ((nCurrentPacket < pPackets.Length) && (pPackets[nCurrentPacket] is SignaturePacket))
{
SignaturePacket spKeySignature = (SignaturePacket)pPackets[nCurrentPacket++];
if (spKeySignature.SignatureType == SignatureTypes.SubkeyBindingSignature)
{
cpsSubKey.KeyBindingSignature = spKeySignature;
}
else if (spKeySignature.SignatureType == SignatureTypes.SubkeyRevocationSignature)
{
cpsSubKey.RevocationSignature = spKeySignature;
}
}
if (nCurrentPacket < pPackets.Length)
{
if (!(pPackets[nCurrentPacket] is PublicKeyPacket))
{
throw(new ArgumentException("The given packet is not in the required transportable public key format (expected public subkey packet)!"));
}
}
/*
* if (nCurrentPacket < pPackets.Length) {
* if (pPackets[nCurrentPacket] is SignaturePacket) {
* SignaturePacket spSubkeyRev = (SignaturePacket)pPackets[nCurrentPacket++];
* cpsSubKey.RevocationSignature = spSubkeyRev;
* }
* }
*/
this.SubKeys.Add(cpsSubKey);
}
} catch (System.IndexOutOfRangeException) {
if (nUserIDCounter == 0)
{
throw(new ArgumentException("The given packet is not in the required transportable public key format (no userid packet found)!"));
}
}
}
/// <summary>
/// Finds a subkey (or the primary key) that fits to the given
/// requirements (meaning it must be supposed to be used for
/// the given action, which can be either signing or encryption).
/// If more than just one keys fullfill the requirements, the one
/// with the newer creationdate is used.
/// </summary>
/// <remarks>No remarks</remarks>
/// <param name="aaAction">The action (signing or encrypting) for
/// which the key should be used</param>
/// <returns>Returns a public key packet fullfilling the given
/// requirements (the action) or null, if it did not find such
/// a key.</returns>
public PublicKeyPacket FindKey(AsymActions aaAction)
{
DateTime dtCandidateTime = DateTime.Now;
PublicKeyPacket pkpCandidate = new PublicKeyPacket();
bool bFound = false;
// First check the primary Key
if (aaAction == AsymActions.Encrypt)
{
if (pkpPrimaryKey.Algorithm == AsymAlgorithms.ElGama_Encrypt_Sign ||
pkpPrimaryKey.Algorithm == AsymAlgorithms.ElGamal_Encrypt_Only ||
pkpPrimaryKey.Algorithm == AsymAlgorithms.RSA_Encrypt_Only ||
pkpPrimaryKey.Algorithm == AsymAlgorithms.RSA_Encrypt_Sign)
{
dtCandidateTime = pkpPrimaryKey.TimeCreated;
bFound = true;
pkpCandidate = pkpPrimaryKey;
}
}
else if (aaAction == AsymActions.Sign)
{
if (pkpPrimaryKey.Algorithm == AsymAlgorithms.ElGama_Encrypt_Sign ||
pkpPrimaryKey.Algorithm == AsymAlgorithms.DSA ||
pkpPrimaryKey.Algorithm == AsymAlgorithms.RSA_Sign_Only ||
pkpPrimaryKey.Algorithm == AsymAlgorithms.RSA_Encrypt_Sign)
{
dtCandidateTime = pkpPrimaryKey.TimeCreated;
bFound = true;
pkpCandidate = pkpPrimaryKey;
}
}
// Now check the subkeys
IEnumerator ieSubkeys = alSubkeys.GetEnumerator();
while (ieSubkeys.MoveNext())
{
CertifiedPublicSubkey cpsKey = (CertifiedPublicSubkey)ieSubkeys.Current;
// The subkey has been revoced
if (cpsKey.RevocationSignature != null)
{
continue;
}
PublicKeyPacket pkpKey = cpsKey.Subkey;
if (aaAction == AsymActions.Encrypt)
{
if (pkpKey.Algorithm == AsymAlgorithms.ElGama_Encrypt_Sign ||
pkpKey.Algorithm == AsymAlgorithms.ElGamal_Encrypt_Only ||
pkpKey.Algorithm == AsymAlgorithms.RSA_Encrypt_Only ||
pkpKey.Algorithm == AsymAlgorithms.RSA_Encrypt_Sign)
{
if ((bFound && dtCandidateTime < pkpKey.TimeCreated) || (!bFound))
{
dtCandidateTime = pkpKey.TimeCreated;
bFound = true;
pkpCandidate = pkpKey;
}
}
}
else if (aaAction == AsymActions.Sign)
{
if (pkpKey.Algorithm == AsymAlgorithms.ElGama_Encrypt_Sign ||
pkpKey.Algorithm == AsymAlgorithms.DSA ||
pkpKey.Algorithm == AsymAlgorithms.RSA_Sign_Only ||
pkpKey.Algorithm == AsymAlgorithms.RSA_Encrypt_Sign)
{
if ((bFound && dtCandidateTime < pkpKey.TimeCreated) || (!bFound))
{
dtCandidateTime = pkpKey.TimeCreated;
bFound = true;
pkpCandidate = pkpKey;
}
}
}
}
if (bFound)
{
return(pkpCandidate);
}
return(null);
}
/// <summary>
/// Generates the transportable public key out of the properties
/// in this.
/// </summary>
/// <remarks>No remarks</remarks>
/// <returns>Returns a byte array containing the openpgp encoded
/// representation of the transportable public key.</returns>
public byte[] Generate()
{
byte[] bPrimaryKey = this.PrimaryKey.Generate();
//Revocation signatures
int iLength = 0;
IEnumerator ieRevocations = this.RevocationSignatures.GetEnumerator();
while (ieRevocations.MoveNext())
{
if (ieRevocations.Current is SignaturePacket)
{
iLength += ((SignaturePacket)ieRevocations.Current).Generate().Length;
}
}
byte[] bRevocations = new byte[iLength];
ieRevocations = this.RevocationSignatures.GetEnumerator();
int iPosition = 0;
while (ieRevocations.MoveNext())
{
if (ieRevocations.Current is SignaturePacket)
{
byte[] bRev = ((SignaturePacket)ieRevocations.Current).Generate();
Array.Copy(bRev, 0, bRevocations, iPosition, bRev.Length);
iPosition += bRev.Length;
}
}
// Revoker keys
iLength = 0;
IEnumerator ieRevoker = this.RevocationKeys.GetEnumerator();
while (ieRevoker.MoveNext())
{
if (ieRevoker.Current is SignaturePacket)
{
iLength += ((SignaturePacket)ieRevoker.Current).Generate().Length;
}
}
byte[] bRevoker = new byte[iLength];
ieRevoker = this.RevocationKeys.GetEnumerator();
iPosition = 0;
while (ieRevoker.MoveNext())
{
if (ieRevoker.Current is SignaturePacket)
{
byte[] bRev = ((SignaturePacket)ieRevoker.Current).Generate();
Array.Copy(bRev, 0, bRevoker, iPosition, bRev.Length);
iPosition += bRev.Length;
}
}
//Certificates
iLength = 0;
IEnumerator ieCertificates = this.Certifications.GetEnumerator();
while (ieCertificates.MoveNext())
{
if (ieCertificates.Current is CertifiedUserID)
{
CertifiedUserID cuiID = (CertifiedUserID)ieCertificates.Current;
iLength += cuiID.Generate().Length;
}
}
byte[] bCertificates = new byte[iLength];
iPosition = 0;
ieCertificates = this.Certifications.GetEnumerator();
while (ieCertificates.MoveNext())
{
if (ieCertificates.Current is CertifiedUserID)
{
CertifiedUserID cuiID = (CertifiedUserID)ieCertificates.Current;
byte[] bCert = cuiID.Generate();
Array.Copy(bCert, 0, bCertificates, iPosition, bCert.Length);
iPosition += bCert.Length;
}
}
//SubKeys
iLength = 0;
IEnumerator ieSubkeys = this.SubKeys.GetEnumerator();
while (ieSubkeys.MoveNext())
{
if (ieSubkeys.Current is CertifiedPublicSubkey)
{
CertifiedPublicSubkey cpsKey = (CertifiedPublicSubkey)ieSubkeys.Current;
iLength += cpsKey.Generate().Length;
}
}
byte[] bSubkeys = new byte[iLength];
iPosition = 0;
ieSubkeys = this.SubKeys.GetEnumerator();
while (ieSubkeys.MoveNext())
{
if (ieSubkeys.Current is CertifiedPublicSubkey)
{
CertifiedPublicSubkey cpsKey = (CertifiedPublicSubkey)ieSubkeys.Current;
byte[] bKey = cpsKey.Generate();
Array.Copy(bKey, 0, bSubkeys, iPosition, bKey.Length);
iPosition += bKey.Length;
}
}
byte[] bData = new byte[bPrimaryKey.Length + bRevocations.Length +
bRevoker.Length + bCertificates.Length + bSubkeys.Length];
iPosition = 0;
Array.Copy(bPrimaryKey, bData, bPrimaryKey.Length);
iPosition = bPrimaryKey.Length;
Array.Copy(bRevocations, 0, bData, iPosition, bRevocations.Length);
iPosition += bRevocations.Length;
Array.Copy(bRevoker, 0, bData, iPosition, bRevoker.Length);
iPosition += bRevoker.Length;
Array.Copy(bCertificates, 0, bData, iPosition, bCertificates.Length);
iPosition += bCertificates.Length;
Array.Copy(bSubkeys, 0, bData, iPosition, bSubkeys.Length);
return(bData);
}
