public SshKey(SshVersion version, AsymmetricKeyParameter publicKeyParameter,
AsymmetricKeyParameter privateKeyParameter = null, string comment = "",
OpensshCertificate certificate = null)
{
if (publicKeyParameter == null)
{
throw new ArgumentNullException("publicKeyParameter");
}
IsPublicOnly = (privateKeyParameter == null);
Version = version;
this.publicKeyParameter = publicKeyParameter;
this.privateKeyParameter = privateKeyParameter;
Certificate = certificate;
Comment = comment;
keyConstraints = new List <Agent.KeyConstraint>();
}
public SshKey(SshVersion version, AsymmetricCipherKeyPair cipherKeyPair,
string comment = "", OpensshCertificate certificate = null)
: this(version, cipherKeyPair.Public, cipherKeyPair.Private, comment, certificate)
{
}
/// <summary>
/// reads OpenSSH formatted public key blob and creates
/// an AsymmetricKeyParameter object
/// </summary>
/// <returns>AsymmetricKeyParameter containing the public key</returns>
public AsymmetricKeyParameter ReadSsh2PublicKeyData(out OpensshCertificate cert)
{
cert = null;
var algorithm = Encoding.UTF8.GetString(ReadBlob());
var certBuilder = new BlobBuilder();
certBuilder.AddStringBlob(algorithm);
switch (algorithm)
{
case PublicKeyAlgorithmExt.ALGORITHM_RSA_KEY: {
var n = new BigInteger(1, ReadBlob()); // modulus
var e = new BigInteger(1, ReadBlob()); // exponent
if (n.BitLength < e.BitLength)
{
// In some cases, the modulus is first. We can always tell because
// it is significantly larget than the exponent.
return(new RsaKeyParameters(false, e, n));
}
return(new RsaKeyParameters(false, n, e));
}
case PublicKeyAlgorithmExt.ALGORITHM_RSA_CERT_V1: {
var nonce = ReadBlob();
if (nonce.Length != 32)
{
// we are being called from SSH2_AGENTC_ADD_IDENTITY and this blob
// is the whole certificate, not the nonce
var certParser = new BlobParser(nonce);
return(certParser.ReadSsh2PublicKeyData(out cert));
}
else
{
certBuilder.AddBlob(nonce);
var e = new BigInteger(1, ReadBlob());
certBuilder.AddBigIntBlob(e);
var n = new BigInteger(1, ReadBlob());
certBuilder.AddBigIntBlob(n);
cert = ReadCertificate(certBuilder);
return(new RsaKeyParameters(false, n, e));
}
}
case PublicKeyAlgorithmExt.ALGORITHM_DSA_KEY: {
var p = new BigInteger(1, ReadBlob());
var q = new BigInteger(1, ReadBlob());
var g = new BigInteger(1, ReadBlob());
var y = new BigInteger(1, ReadBlob());
var dsaParams = new DsaParameters(p, q, g);
return(new DsaPublicKeyParameters(y, dsaParams));
}
case PublicKeyAlgorithmExt.ALGORITHM_DSA_CERT_V1: {
var nonce = ReadBlob();
if (nonce.Length != 32)
{
// we are being called from SSH2_AGENTC_ADD_IDENTITY and this blob
// is the whole certificate, not the nonce
var certParser = new BlobParser(nonce);
return(certParser.ReadSsh2PublicKeyData(out cert));
}
else
{
certBuilder.AddBlob(nonce);
var p = new BigInteger(1, ReadBlob());
certBuilder.AddBigIntBlob(p);
var q = new BigInteger(1, ReadBlob());
certBuilder.AddBigIntBlob(q);
var g = new BigInteger(1, ReadBlob());
certBuilder.AddBigIntBlob(g);
var y = new BigInteger(1, ReadBlob());
certBuilder.AddBigIntBlob(y);
cert = ReadCertificate(certBuilder);
var dsaParams = new DsaParameters(p, q, g);
return(new DsaPublicKeyParameters(y, dsaParams));
}
}
case PublicKeyAlgorithmExt.ALGORITHM_ECDSA_SHA2_NISTP256_KEY:
case PublicKeyAlgorithmExt.ALGORITHM_ECDSA_SHA2_NISTP384_KEY:
case PublicKeyAlgorithmExt.ALGORITHM_ECDSA_SHA2_NISTP521_KEY: {
var curveName = ReadString();
var publicKey = ReadBlob();
var x9Params = SecNamedCurves.GetByName(EcCurveToAlgorithm(curveName));
var domainParams = new ECDomainParameters(x9Params.Curve, x9Params.G, x9Params.N, x9Params.H);
var point = x9Params.Curve.DecodePoint(publicKey);
return(new ECPublicKeyParameters(point, domainParams));
}
case PublicKeyAlgorithmExt.ALGORITHM_ECDSA_SHA2_NISTP256_CERT_V1:
case PublicKeyAlgorithmExt.ALGORITHM_ECDSA_SHA2_NISTP384_CERT_V1:
case PublicKeyAlgorithmExt.ALGORITHM_ECDSA_SHA2_NISTP521_CERT_V1: {
var nonce = ReadBlob();
if (nonce.Length != 32)
{
// we are being called from SSH2_AGENTC_ADD_IDENTITY and this blob
// is the whole certificate, not the nonce
var certParser = new BlobParser(nonce);
return(certParser.ReadSsh2PublicKeyData(out cert));
}
else
{
certBuilder.AddBlob(nonce);
var curveName = ReadString();
certBuilder.AddStringBlob(curveName);
var publicKey = ReadBlob();
certBuilder.AddBlob(publicKey);
cert = ReadCertificate(certBuilder);
var x9Params = SecNamedCurves.GetByName(EcCurveToAlgorithm(curveName));
var domainParams = new ECDomainParameters(x9Params.Curve, x9Params.G, x9Params.N, x9Params.H);
var point = x9Params.Curve.DecodePoint(publicKey);
return(new ECPublicKeyParameters(point, domainParams));
}
}
case PublicKeyAlgorithmExt.ALGORITHM_ED25519: {
var publicKey = ReadBlob();
return(new Ed25519PublicKeyParameter(publicKey));
}
case PublicKeyAlgorithmExt.ALGORITHM_ED25519_CERT_V1: {
var nonce = ReadBlob();
if (nonce.Length != 32)
{
// we are being called from SSH2_AGENTC_ADD_IDENTITY and this blob
// is the whole certificate, not the nonce
var certParser = new BlobParser(nonce);
certParser.ReadSsh2PublicKeyData(out cert);
var publicKey = ReadBlob();
return(new Ed25519PublicKeyParameter(publicKey));
}
else
{
certBuilder.AddBlob(nonce);
var publicKey = ReadBlob();
certBuilder.AddBlob(publicKey);
cert = ReadCertificate(certBuilder);
return(new Ed25519PublicKeyParameter(publicKey));
}
}
default:
// unsupported encryption algorithm
throw new Exception("Unsupported algorithm");
}
}
