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Function silc_message_payload_encrypt SYNOPSIS
        bool silc_message_payload_encrypt(unsigned char *data,
                                          SilcUInt32 data_len,
                                          SilcUInt32 true_len,
                                          unsigned char *iv,
                                          SilcUInt32 iv_len,
                                          SilcCipher cipher,
                                          SilcHmac hmac);
DESCRIPTION
        This function is used to encrypt the Messsage Payload which is
        the `data' and `data_len'.  The `data_len' is the data length which
        is used to create MAC out of.  The `data' MUST have additional space
        after `true_len' bytes for the MAC which is appended to the data.

        This is usually used by the Message Payload interface itself but can
        be called by the appliation if separate encryption process is required.
        For example server might need to call this directly in some
        circumstances. The `cipher' is used to encrypt the payload and `hmac'
        to compute the MAC for the payload.
SILC Message Interface SilcMessagePayload SilcMessageSignedPayload SilcMessageFlags silc_message_payload_decrypt silc_message_payload_parse silc_message_payload_encrypt silc_message_payload_encode silc_message_payload_free silc_message_get_flags silc_message_get_data silc_message_get_mac silc_message_get_iv silc_message_get_signature silc_message_signed_payload_parse silc_message_signed_payload_encode silc_message_signed_payload_free silc_message_signed_verify silc_message_signed_get_public_key

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