internal byte[] BuildECCPublicBlob(EcDsaJsonWebKey jwk)
{
KeyBlobMagicNumber magic;
KeySize keySize;
switch (jwk.m_curve)
{
case "P-256": {
magic = KeyBlobMagicNumber.ECDSA_PUBLIC_P256;
keySize = KeySize.P256;
break;
}
case "P-384": {
magic = KeyBlobMagicNumber.ECDSA_PUBLIC_P384;
keySize = KeySize.P384;
break;
}
case "P-521": {
magic = KeyBlobMagicNumber.ECDSA_PUBLIC_P521;
keySize = KeySize.P521;
break;
}
default: {
throw new Exception("Unknown curve: " + jwk.m_curve);
}
}
byte[] x = Base64UrlEncoder.DecodeBytes(jwk.m_x);
x = FillBytes(x, (int)keySize);
byte[] y = Base64UrlEncoder.DecodeBytes(jwk.m_y);
y = FillBytes(y, (int)keySize);
// Finally, lay out the structure itself
byte[] blob = new byte[2 * sizeof(int) + x.Length + y.Length];
int offset = 0;
Func <int, int> increaseOffset = (size) => {
offset += size;
return(size);
};
Buffer.BlockCopy(BitConverter.GetBytes((int)magic), 0, blob, offset, increaseOffset(sizeof(int)));
Buffer.BlockCopy(BitConverter.GetBytes(x.Length), 0, blob, offset, increaseOffset(sizeof(int)));
Buffer.BlockCopy(x, 0, blob, offset, increaseOffset(x.Length));
Buffer.BlockCopy(y, 0, blob, offset, increaseOffset(y.Length));
return(blob);
}
internal byte[] BuildECCPublicBlob( EcDsaJsonWebKey jwk ) {
KeyBlobMagicNumber magic;
KeySize keySize;
switch( jwk.m_curve ) {
case "P-256": {
magic = KeyBlobMagicNumber.ECDSA_PUBLIC_P256;
keySize = KeySize.P256;
break;
}
case "P-384": {
magic = KeyBlobMagicNumber.ECDSA_PUBLIC_P384;
keySize = KeySize.P384;
break;
}
case "P-521": {
magic = KeyBlobMagicNumber.ECDSA_PUBLIC_P521;
keySize = KeySize.P521;
break;
}
default: {
throw new Exception( "Unknown curve: " + jwk.m_curve );
}
}
byte[] x = Base64UrlEncoder.DecodeBytes( jwk.m_x );
x = FillBytes( x, (int)keySize );
byte[] y = Base64UrlEncoder.DecodeBytes( jwk.m_y );
y = FillBytes( y, (int) keySize );
// Finally, lay out the structure itself
byte[] blob = new byte[2 * sizeof(int) + x.Length + y.Length];
int offset = 0;
Func<int, int> increaseOffset = ( size ) => {
offset += size;
return size;
};
Buffer.BlockCopy(BitConverter.GetBytes((int)magic), 0, blob, offset, increaseOffset(sizeof(int)));
Buffer.BlockCopy(BitConverter.GetBytes(x.Length), 0, blob, offset, increaseOffset(sizeof(int)));
Buffer.BlockCopy(x, 0, blob, offset, increaseOffset(x.Length));
Buffer.BlockCopy(y, 0, blob, offset, increaseOffset(y.Length));
return blob;
}