typedef struct { ... } *SilcSKEKeyMaterial;

    This is the key material structure, and is passed as argument by the
    application to silc_ske_process_key_material_data function. It includes
    the processed key material which can be used as SILC session keys.

    typedef struct SilcSKEKeyMaterialStruct {
      unsigned char *send_iv;
      unsigned char *receive_iv;
      SilcUInt32 iv_len;
      unsigned char *send_enc_key;
      unsigned char *receive_enc_key;
      SilcUInt32 enc_key_len;              /* Key length in bits */
      unsigned char *send_hmac_key;
      unsigned char *receive_hmac_key;
      SilcUInt32 hmac_key_len;             /* Key length in bytes */
    } *SilcSKEKeyMaterial;