1 package org.bouncycastle.crypto.params; 2 3 import java.security.SecureRandom; 4 5 public class DSAParameterGenerationParameters 6 { 7 public static final int DIGITAL_SIGNATURE_USAGE = 1; 8 public static final int KEY_ESTABLISHMENT_USAGE = 2; 9 10 private final int l; 11 private final int n; 12 private final int usageIndex; 13 private final int certainty; 14 private final SecureRandom random; 15 16 /** 17 * Construct without a usage index, this will do a random construction of G. 18 * 19 * @param L desired length of prime P in bits (the effective key size). 20 * @param N desired length of prime Q in bits. 21 * @param certainty certainty level for prime number generation. 22 * @param random the source of randomness to use. 23 */ 24 public DSAParameterGenerationParameters( 25 int L, 26 int N, 27 int certainty, 28 SecureRandom random) 29 { 30 this(L, N, certainty, random, -1); 31 } 32 33 /** 34 * Construct for a specific usage index - this has the effect of using verifiable canonical generation of G. 35 * 36 * @param L desired length of prime P in bits (the effective key size). 37 * @param N desired length of prime Q in bits. 38 * @param certainty certainty level for prime number generation. 39 * @param random the source of randomness to use. 40 * @param usageIndex a valid usage index. 41 */ 42 public DSAParameterGenerationParameters( 43 int L, 44 int N, 45 int certainty, 46 SecureRandom random, 47 int usageIndex) 48 { 49 this.l = L; 50 this.n = N; 51 this.certainty = certainty; 52 this.usageIndex = usageIndex; 53 this.random = random; 54 } 55 56 public int getL() 57 { 58 return l; 59 } 60 61 public int getN() 62 { 63 return n; 64 } 65 66 public int getCertainty() 67 { 68 return certainty; 69 } 70 71 public SecureRandom getRandom() 72 { 73 return random; 74 } 75 76 public int getUsageIndex() 77 { 78 return usageIndex; 79 } 80 } 81
