gnu.java.security.key.dss
Class FIPS186
An implementation of the DSA parameters generation as described in FIPS-186.
References:
Digital Signature
Standard (DSS), Federal Information Processing Standards Publication
186. National Institute of Standards and Technology.
BigInteger[] | generateParameters()- This method generates the DSS
p, q, and
g parameters only when L (the modulus length)
is not one of the following: 512, 768 and
1024.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
generateParameters
public BigInteger[] generateParameters()
This method generates the DSS
p,
q, and
g parameters only when
L (the modulus length)
is not one of the following:
512,
768 and
1024. For those values of
L, this
implementation uses pre-computed values of
p,
q, and
g given in the document
CryptoSpec
included in the security guide documentation of the standard JDK
distribution.
The DSS requires two primes ,
p and
q,
satisfying the following three conditions:
2159 < q < 21602L-1 < p < 2L for a
specified L, where L = 512 + 64j for some
0 <= j <= 8- q divides p - 1.
The algorithm used to find these primes is as described in FIPS-186,
section 2.2: GENERATION OF PRIMES. This prime generation scheme starts by
using the
Sha160 and a user supplied
SEED to construct a
prime,
q, in the range 2
159 < q < 2
160.
Once this is accomplished, the same
SEED value is used to construct
an
X in the range
2L-1
< X < 2L. The prime, p, is then
formed by rounding
X to a number congruent to
1 mod
2q. In this implementation we use the same
SEED value given
in FIPS-186, Appendix 5.
FIPS186.java --
Copyright 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
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