◆ DeriveKeyMaterial() [1/2]

byte[] System.Security.Cryptography.ECDiffieHellmanCng.DeriveKeyMaterial ( CngKey otherPartyPublicKey )

inline

Definition at line 261 of file ECDiffieHellmanCng.cs.

    {
        if (otherPartyPublicKey == null)
        {
            throw new ArgumentNullException("otherPartyPublicKey");
        }
        if (otherPartyPublicKey.AlgorithmGroup != CngAlgorithmGroup.ECDiffieHellman)
        {
            throw new ArgumentException(System.SR.Cryptography_ArgECDHRequiresECDHKey, "otherPartyPublicKey");
        }
        if (otherPartyPublicKey.KeySize != KeySize)
        {
            throw new ArgumentException(System.SR.Cryptography_ArgECDHKeySizeMismatch, "otherPartyPublicKey");
        }
        global::Interop.NCrypt.SecretAgreementFlags flags = (UseSecretAgreementAsHmacKey ? global::Interop.NCrypt.SecretAgreementFlags.UseSecretAsHmacKey : global::Interop.NCrypt.SecretAgreementFlags.None);
        using SafeNCryptSecretHandle secretAgreement = DeriveSecretAgreementHandle(otherPartyPublicKey);
        switch (KeyDerivationFunction)
        {
        case ECDiffieHellmanKeyDerivationFunction.Hash:
            return global::Interop.NCrypt.DeriveKeyMaterialHash(secretAgreement, HashAlgorithm.Algorithm, _secretPrepend, _secretAppend, flags);
        case ECDiffieHellmanKeyDerivationFunction.Hmac:
            return global::Interop.NCrypt.DeriveKeyMaterialHmac(secretAgreement, HashAlgorithm.Algorithm, _hmacKey, _secretPrepend, _secretAppend, flags);
        default:
            if (_label == null || _seed == null)
            {
                throw new InvalidOperationException(System.SR.Cryptography_TlsRequiresLabelAndSeed);
            }
            return global::Interop.NCrypt.DeriveKeyMaterialTls(secretAgreement, _label, _seed, flags);
        }
    }