/// <summary>
/// Derives the key material that is generated from the secret agreement between two parties, given an ECDiffieHellmanPublicKey object that contains the second party's public key.
/// (Secret Prepend/Append Not Implemented yet)
/// </summary>
/// <param name="otherPartyPublicKey">A byte array that contains the public part of the Elliptic Curve Diffie-Hellman (ECDH) key from the other party in the key exchange.</param>
/// <returns>A byte array that contains the key material. This information is generated from the secret agreement that is calculated from the current object's private key and the specified public key.</returns>
public CryptoKey DeriveKeyMaterial(byte[] otherPartyPublicKey)
{
if (otherPartyPublicKey == null)
{
throw new ArgumentNullException();
}
ECDH1_PARAMS ecData = new ECDH1_PARAMS();
ecData.PeerPublicData = otherPartyPublicKey;
if (KeyDerivationFunction == ECDiffieHellmanKeyDerivationFunction.Hash)
{
//byte[] secretAppend = SecretAppend == null ? null : SecretAppend.Clone() as byte[];
//byte[] secretPrepend = SecretPrepend == null ? null : SecretPrepend.Clone() as byte[];
switch (m_hashAlgorithm)
{
case MechanismType.SHA_1:
case MechanismType.SHA1_KEY_DERIVATION:
ecData.KDF = MechanismType.SHA1_KEY_DERIVATION;
break;
case MechanismType.SHA256_KEY_DERIVATION:
case MechanismType.SHA256:
ecData.KDF = MechanismType.SHA256_KEY_DERIVATION;
break;
case MechanismType.SHA384_KEY_DERIVATION:
case MechanismType.SHA384:
ecData.KDF = MechanismType.SHA256_KEY_DERIVATION;
break;
case MechanismType.SHA512_KEY_DERIVATION:
case MechanismType.SHA512:
ecData.KDF = MechanismType.SHA512_KEY_DERIVATION;
break;
case MechanismType.MD5_KEY_DERIVATION:
case MechanismType.MD5:
ecData.KDF = MechanismType.MD5_KEY_DERIVATION;
break;
default:
ecData.KDF = m_hashAlgorithm;
break;
}
}
else if (KeyDerivationFunction == ECDiffieHellmanKeyDerivationFunction.Hmac)
{
//byte[] hmacKey = HmacKey == null ? null : HmacKey.Clone() as byte[];
//byte[] secretAppend = SecretAppend == null ? null : SecretAppend.Clone() as byte[];
//byte[] secretPrepend = SecretPrepend == null ? null : SecretPrepend.Clone() as byte[];
ecData.KDF = MechanismType.SHA256_HMAC;
}
else if (KeyDerivationFunction == ECDiffieHellmanKeyDerivationFunction.Tls)
{
//byte[] label = Label == null ? null : Label.Clone() as byte[];
//byte[] seed = Seed == null ? null : Seed.Clone() as byte[];
//if (label == null || seed == null)
//{
// throw new InvalidOperationException();
//}
ecData.KDF = MechanismType.TLS_MASTER_KEY_DERIVE_DH;
}
else
{
ecData.KDF = MechanismType.NULL_KEY_DERIVATION;
}
return(KeyPair.DeriveKey(new Mechanism(MechanismType.ECDH1_DERIVE, ecData.ToArray()), null));
}
/// <summary>
/// Derives the key material that is generated from the secret agreement between two parties, given an ECDiffieHellmanPublicKey object that contains the second party's public key.
/// (Secret Prepend/Append Not Implemented yet)
/// </summary>
/// <param name="otherPartyPublicKey">A byte array that contains the public part of the Elliptic Curve Diffie-Hellman (ECDH) key from the other party in the key exchange.</param>
/// <returns>A byte array that contains the key material. This information is generated from the secret agreement that is calculated from the current object's private key and the specified public key.</returns>
public CryptoKey DeriveKeyMaterial(byte[] otherPartyPublicKey)
{
if (otherPartyPublicKey == null)
{
throw new ArgumentNullException();
}
ECDH1_PARAMS ecData = new ECDH1_PARAMS();
ecData.PeerPublicData = otherPartyPublicKey;
if (KeyDerivationFunction == ECDiffieHellmanKeyDerivationFunction.Hash)
{
//byte[] secretAppend = SecretAppend == null ? null : SecretAppend.Clone() as byte[];
//byte[] secretPrepend = SecretPrepend == null ? null : SecretPrepend.Clone() as byte[];
switch(m_hashAlgorithm)
{
case MechanismType.SHA_1:
case MechanismType.SHA1_KEY_DERIVATION:
ecData.KDF = MechanismType.SHA1_KEY_DERIVATION;
break;
case MechanismType.SHA256_KEY_DERIVATION:
case MechanismType.SHA256:
ecData.KDF = MechanismType.SHA256_KEY_DERIVATION;
break;
case MechanismType.SHA384_KEY_DERIVATION:
case MechanismType.SHA384:
ecData.KDF = MechanismType.SHA256_KEY_DERIVATION;
break;
case MechanismType.SHA512_KEY_DERIVATION:
case MechanismType.SHA512:
ecData.KDF = MechanismType.SHA512_KEY_DERIVATION;
break;
case MechanismType.MD5_KEY_DERIVATION:
case MechanismType.MD5:
ecData.KDF = MechanismType.MD5_KEY_DERIVATION;
break;
default:
ecData.KDF = m_hashAlgorithm;
break;
}
}
else if (KeyDerivationFunction == ECDiffieHellmanKeyDerivationFunction.Hmac)
{
//byte[] hmacKey = HmacKey == null ? null : HmacKey.Clone() as byte[];
//byte[] secretAppend = SecretAppend == null ? null : SecretAppend.Clone() as byte[];
//byte[] secretPrepend = SecretPrepend == null ? null : SecretPrepend.Clone() as byte[];
ecData.KDF = MechanismType.SHA256_HMAC;
}
else if(KeyDerivationFunction == ECDiffieHellmanKeyDerivationFunction.Tls)
{
//byte[] label = Label == null ? null : Label.Clone() as byte[];
//byte[] seed = Seed == null ? null : Seed.Clone() as byte[];
//if (label == null || seed == null)
//{
// throw new InvalidOperationException();
//}
ecData.KDF = MechanismType.TLS_MASTER_KEY_DERIVE_DH;
}
else
{
ecData.KDF = MechanismType.NULL_KEY_DERIVATION;
}
return KeyPair.DeriveKey(new Mechanism(MechanismType.ECDH1_DERIVE, ecData.ToArray()), null);
}
