FIPS186 (GNU cryptographic primitives and tools)
Keywords: gnu.crypto.key.dss.FIPS186,FIPS186 class

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## gnu.crypto.key.dss
Class FIPS186

    java.lang.Object
      |
      +--gnu.crypto.key.dss.FIPS186

public class FIPS186
extends java.lang.Object

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.

Field Summary
`static int` | `DSA_PARAMS_COUNTER`
`static int` | `DSA_PARAMS_E`
`static int` | `DSA_PARAMS_G`
`static int` | `DSA_PARAMS_P`
`static int` | `DSA_PARAMS_Q`
`static int` | `DSA_PARAMS_SEED`

Constructor Summary
`FIPS186(int L, java.security.SecureRandom rnd)`

Method Summary
`java.math.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`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DSA_PARAMS_SEED

    public static final int DSA_PARAMS_SEED

See Also:
  Constant Field Values

### DSA_PARAMS_COUNTER

    public static final int DSA_PARAMS_COUNTER

See Also:
  Constant Field Values

### DSA_PARAMS_Q

    public static final int DSA_PARAMS_Q

See Also:
  Constant Field Values

### DSA_PARAMS_P

    public static final int DSA_PARAMS_P

See Also:
  Constant Field Values

### DSA_PARAMS_E

    public static final int DSA_PARAMS_E

See Also:
  Constant Field Values

### DSA_PARAMS_G

    public static final int DSA_PARAMS_G

See Also:
  Constant Field Values

Constructor Detail

### FIPS186

    public FIPS186(int L,
                   java.security.SecureRandom rnd)

Method Detail

### generateParameters

    public java.math.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 < 2160`
  - `2L-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 2159 < q < 2160. 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.

  `

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