public static JwsPacket Encapsulate(PrivKey key, string?kid, string nonce, string url, object?payload)
{
JwsKey jwk = CreateJwsKey(key.PublicKey, out string algName, out string signerName);
JwsProtected protect = new JwsProtected()
{
alg = algName,
jwk = kid._IsEmpty() ? jwk : null,
kid = kid._IsEmpty() ? null : kid,
nonce = nonce,
url = url,
};
JwsPacket ret = new JwsPacket()
{
Protected = protect._ObjectToJson(base64url: true, includeNull: true),
payload = (payload == null ? "" : payload._ObjectToJson(base64url: true)),
};
var signer = key.GetSigner(signerName);
byte[] signature = signer.Sign((ret.Protected + "." + ret.payload)._GetBytes_Ascii());
ret.signature = signature._Base64UrlEncode();
return(ret);
}
public static JwsKey CreateJwsKey(PubKey key, out string algName, out string signerName)
{
JwsKey jwk;
switch (key.Algorithm)
{
case PkiAlgorithm.ECDSA:
jwk = new JwsKey()
{
kty = "EC",
crv = "P-" + key.BitsSize,
x = key.EcdsaParameters.Q.AffineXCoord.GetEncoded()._Base64UrlEncode(),
y = key.EcdsaParameters.Q.AffineYCoord.GetEncoded()._Base64UrlEncode(),
};
switch (key.BitsSize)
{
case 256:
algName = "ES256";
signerName = "SHA-256withPLAIN-ECDSA";
break;
case 384:
algName = "ES384";
signerName = "SHA-384withPLAIN-ECDSA";
break;
default:
throw new ArgumentException("Unsupported key length.");
}
break;
case PkiAlgorithm.RSA:
jwk = new JwsKey()
{
kty = "RSA",
n = key.RsaParameters.Modulus.ToByteArray()._Base64UrlEncode(),
e = key.RsaParameters.Exponent.ToByteArray()._Base64UrlEncode(),
};
algName = "RS256";
signerName = PkcsObjectIdentifiers.Sha256WithRsaEncryption.Id;
break;
default:
throw new ArgumentException("Unsupported key.Algorithm.");
}
return(jwk);
}
