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keyring: genSK, genSKfromPK, sktopk, dhparams - generate keys


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);


GenSK generates a public/private key pair, represented by SK. (Although we call it a `private key', SK contains both the private and public parts of a public key.) Algname is the name of the algorithm to use; in the current implementation, only elgamal and rsa are possible. Owner is the user name to be associated with the key. Length gives the length of the key modulus in bits. GenSK returns nil if an unknown algorithm has been specified.

GenSKfromPK generates a private key that has the same system parameters as the public key pk. It is used to generate new keys that are of the same complexity as old keys.

Sktopk extracts the public part of private key.

Dhparams creates Diffie-Hellman parameters. The second IPint returned is an nbits long prime number that serves as the modulus. The first IPint is a primitive root in the integer field defined by that modulus.

KEYRING-GENSK(2 ) Rev:  Thu Feb 15 14:43:27 GMT 2007