public CngKey toPublicCngKey()
{
// BCRYPT_ECDH_PRIVATE_P256_MAGIC 0x324B4345
// BCRYPT_ECDH_PRIVATE_P384_MAGIC 0x344B4345
byte[] magic, keyLen;
if (crv.ToLower() == "p-256")
{
// BCRYPT_ECDH_PUBLIC_P256_MAGIC 0x314B4345
magic = new byte[] { 0x45, 0x43, 0x4B, 0x31 };
keyLen = new byte[] { 32, 0, 0, 0 };
}
else if (crv.ToLower() == "p-384")
{
// BCRYPT_ECDH_PUBLIC_P384_MAGIC 0x334B4345
magic = new byte[] { 0x45, 0x43, 0x4B, 0x33 };
keyLen = new byte[] { 48, 0, 0, 0 };
}
else
{
throw new InvalidOperationException("Unsupported curve");
}
byte[] xbytes = Base64Url.from(this.x);
byte[] ybytes = Base64Url.from(this.y);
byte[] blob = new byte[xbytes.Length + ybytes.Length + magic.Length + 4];
magic.CopyTo(blob, 0);
keyLen.CopyTo(blob, 4);
xbytes.CopyTo(blob, 8);
ybytes.CopyTo(blob, xbytes.Length + 8);
CngKey cngKey = CngKey.Import(blob, CngKeyBlobFormat.EccPublicBlob);
return(cngKey);
}
public ecPublicKey(jwkPublicKey jwkFormatKey)
{
this.X = Base64Url.from(jwkFormatKey.x);
this.Y = Base64Url.from(jwkFormatKey.y);
}
public ecPrivateKey(jwkPrivateKey jwkFormatKey)
{
this.D = Base64Url.from(jwkFormatKey.d);
}
public rsaPublicKey(jwkPublicKey jwkFormatKey)
{
this.Modulus = Base64Url.from(jwkFormatKey.n);
this.Exponent = Base64Url.from(jwkFormatKey.e);
}
public jwkPrivateKey(camelot.ECKeyPair ecKeyPair, string curveName)
: base(ecKeyPair, curveName)
{
this.d = Base64Url.to(ecKeyPair.ExportPrivateKey());
}
