GNUNET-SCALARPRODUCT(1)

NAME
gnunet-scalarproduct - compute a vectorproduct

SYNOPSIS
gnunet-scalarproduct [-e ELEMENTS | --elements=ELEMENTS] [-m MASK | --mask=MASK] [-k KEY | --key=KEY] [-c FILENAME | -config=FILENAME] [-p PEERID | --peer=PEERID] [-h | --help] [-L LOGLEVEL | --loglevel=LOGLEVEL] [-v | --version]

DESCRIPTION
gnunet-scalarproduct enables you to compute a vectorproduct across two peers Alice and Bob.

A client can issue one of two messages to its service:

1.  A request to compute a vectorproduct with another peer (Alice)

2.  Elements to support a peer in computing a vectorproduct (Bob)

Both requests must share the same SID, which can be an arbitrary string identifying the session. SIDs should be unique, however it is sufficient to guarantee the uniqueness of the tupel element count and session ID.

Alice's client must supply the ASCII encoded peer ID of bob's service, it will internally be checked by the client for validity. Invalid values here result in the client or the service failing the session.

Elements are handed over as signed decimal integers, the element count supplied by Alice and Bob must match. Alice can also supply a mask for these values to her service, which allows partial vector products to be computed across the vector. Elements can be masked by setting their the corresponding mask element to zero, any other value means the element will not be masked. Alice's client will also mask all 0-values to avoid information leakage to Bob.

The protocol by definition relies on Alice and Bob being benign, thus Bob can arbitrarily falsify his information. Both peers collaborate to achieve a correct result.

The options are as follows:

-e ELEMENTS | --elements=ELEMENTS
    The element-vector the vectorproduct should be computed over in signed decimal form, eg: "42,1,-3,3,7". Zero value elements will be automatically masked.

-m MASK | --mask=MASK
    Elements in the vector can be masked. There must be at least two elements left in the vector to compute a vectorproduct. Non-Zero values indicate an element is not maskes.

-k KEY | --key=KEY
    The session key, a shared string of arbitrary length from which the SID will be generated.

-c FILENAME | --config=FILENAME
    Use the configuration file FILENAME.

-p PEERID | --peer=PEERID
    The remote peer's ASCII-armored gnunet-peer ID as output by gnunet-peerinfo(1). If this option is not given, the peer will take the Bob's role.

-h | --help
    Print short help on options.

-L LOGLEVEL | --loglevel=LOGLEVEL
    Use LOGLEVEL for logging. Valid values are DEBUG, INFO, WARNING and ERROR.

-v | --version
    Print GNUnet version number.

SEE ALSO
gnunet-peerinfo(1)

The full documentation for gnunet is maintained as a Texinfo manual. If the info(1) and gnunet programs are properly installed at your site, the command

    info gnunet

should give you access to the complete handbook,

    info gnunet-c-tutorial

will give you access to a tutorial for developers.

Depending on your installation, this information is also available in gnunet(7) and gnunet-c-tutorial(7).

BUGS
Report bugs by using https://bugs.gnunet.org or by sending electronic mail to <gnunet-developers@gnu.org>.