code: 9ferno

ref: 21336d544ae90e20070fd7c8be67f3f2c9ccbe38
dir: /man/2/keyring-gensk/

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.TH KEYRING-GENSK 2
.SH NAME
keyring: genSK, genSKfromPK, sktopk, dhparams \- generate keys
.SH SYNOPSIS
.EX
include "keyring.m";
keyring := load Keyring Keyring->PATH;
genSK:  fn(algname, owner: string, length: int): ref SK;
genSKfromPK:  fn(pk: ref PK, owner: string): ref SK;
sktopk:  fn(sk: ref SK): ref PK;
dhparams:  fn(nbits: int): (ref IPint, ref IPint);
.EE
.SH DESCRIPTION
.B GenSK
generates a public/private key pair, represented by
.BR SK .
(Although we call it a `private key',
.B SK
contains both the private and public parts of a public key.)
.I Algname
is the name of the algorithm to use; in the current implementation, only
.B elgamal
and
.B rsa
are possible.
.I Owner
is the user name to be associated with the key.
.I Length
gives the length of the key modulus in bits.
.B GenSK
returns nil if an unknown algorithm has been specified.
.PP
.B GenSKfromPK
generates a private key that has the same system parameters as the public key
.IR pk .
It is used to generate new keys that are of the same complexity as old keys.
.PP
.B Sktopk
extracts the public part of private key.
.PP
.B Dhparams
creates Diffie-Hellman parameters. The second
.B IPint
returned is an
.I nbits
long prime number that serves as the modulus.
The first
.B IPint
is a primitive root in the integer field defined by that modulus.