struct SilcSKESecurityPropertiesStruct { ... };

    Security Properties negotiated between key exchange parties. This
    structure is filled from the Key Exchange Start Payload which is used
    to negotiate what security properties should be used in the
    communication.

    struct SilcSKESecurityPropertiesStruct {
      SilcSKESecurityPropertyFlag flags;     /* Flags */
      SilcSKEDiffieHellmanGroup group;       /* Selected Diffie Hellman group */
      SilcPKCS pkcs;                         /* Selected PKCS algorithm */
      SilcCipher cipher;                     /* Selected cipher */
      SilcHash hash;                         /* Selected hash algorithm */
      SilcHmac hmac;                         /* Selected HMAC */
    };