Copyright © 2001 - 2007 SILC Project SILC Project Website | SILC Toolkit Reference Manual Index

SILC Toolkit Reference Manual
SILC VCard Library
SILC VCard Interface
SILC Crypto Library
Introduction to SILC RNG
SILC RNG Interface
SILC Cipher API
SILC PKCS API
SILC Public Key API
SILC PKCS #1 API
SILC Hash Interface
SILC HMAC Interface
SILC Client Library
Using SILC Client Library Tutorial
Arguments for command_reply Client Operation
SilcStatus Error Arguments in command_reply Client Operation
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Client Library Interface Reference
Client Entry Interface Reference
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SILC MP Interface
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SILC Status Types
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Function silc_message_payload_encode
SYNOPSIS

        SilcBuffer silc_message_payload_encode(SilcMessageFlags flags,
                                               const unsigned char *data,
                                               SilcUInt32 data_len,
                                               SilcBool generate_iv,
                                               SilcBool private_message,
                                               SilcCipher cipher,
                                               SilcHmac hmac,
                                               SilcRng rng,
                                               SilcPublicKey public_key,
                                               SilcPrivateKey private_key,
                                               SilcHash hash,
                                               SilcID *sender_id,
                                               SilcID *receiver_id,
                                               SilcBuffer buffer);

DESCRIPTION

        Encodes a Message Payload into a buffer and returns it.  This is
        used to encode channel messages and private messages into a packet.
        If `private_message' is FALSE then this encodes channel message, if
        it is TRUE this encodes private message.  If `private_message' is
        TRUE then `generate_iv' MUST be FALSE if the private message key
        `cipher' is not static key (pre-shared key).  If it is static key
        then protocol dictates that IV must be present in the Message Payload
        and `generate_iv' must be TRUE.  The caller must know whether the key
        is static or not for private messages.  If the key was generated with
        Key Agreement protocol then `generate_iv' is always FALSE.  For
        channel messages `generate_iv' is always set to TRUE value.

        The `cipher' is the cipher used to encrypt the message and `hmac'
        is used to compute the MAC for the payload.  If encoding private
        message that will be encrypted with session keys (no private message
        key) then `cipher' and `hmac' is NULL and this merely encodes the
        payload buffer, and the caller must encrypt the packet later.
        If `rng' is NULL then global RNG is used, if non-NULL then the
        `rng' is used (for IV and padding generation).

        The `public_key', `private_key' and `hash' are provided only if the
        flags includes SILC_MESSAGE_FLAG_SIGNED, in which case the message
        will be digitally signed.  If `public_key' is non-NULL then it will
        be included in the message.  The `private_message' and `hash' MUST
        be provided.  The `hash' SHOULD be SHA1.

        The `sender_id' is the ID message sender and `receiver_id' is ID of
        message receiver.

        If the `buffer' is non-NULL then the payload will be encoded into
        that buffer.  The same buffer is returned.  Otherwise new buffer is
        allocated and returned.  The `buffer' will be automatically enlarged
        if the payload does not fit to it.

SILC Message Interface SilcMessagePayload 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_signed_verify silc_message_signed_get_public_key

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