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128 lines
3.8 KiB
128 lines
3.8 KiB
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.security.spec;
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/**
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* This immutable class specifies the set of parameters used for
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* generating DSA parameters as specified in
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* <a href="http://csrc.nist.gov/publications/fips/fips186-3/fips_186-3.pdf">FIPS 186-3 Digital Signature Standard (DSS)</a>.
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*
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* @see AlgorithmParameterSpec
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*
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* @since 8
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*/
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public final class DSAGenParameterSpec implements AlgorithmParameterSpec {
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private final int pLen;
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private final int qLen;
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private final int seedLen;
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/**
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* Creates a domain parameter specification for DSA parameter
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* generation using {@code primePLen} and {@code subprimeQLen}.
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* The value of {@code subprimeQLen} is also used as the default
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* length of the domain parameter seed in bits.
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* @param primePLen the desired length of the prime P in bits.
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* @param subprimeQLen the desired length of the sub-prime Q in bits.
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* @exception IllegalArgumentException if {@code primePLen}
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* or {@code subprimeQLen} is illegal per the specification of
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* FIPS 186-3.
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*/
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public DSAGenParameterSpec(int primePLen, int subprimeQLen) {
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this(primePLen, subprimeQLen, subprimeQLen);
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}
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/**
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* Creates a domain parameter specification for DSA parameter
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* generation using {@code primePLen}, {@code subprimeQLen},
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* and {@code seedLen}.
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* @param primePLen the desired length of the prime P in bits.
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* @param subprimeQLen the desired length of the sub-prime Q in bits.
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* @param seedLen the desired length of the domain parameter seed in bits,
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* shall be equal to or greater than {@code subprimeQLen}.
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* @exception IllegalArgumentException if {@code primePLenLen},
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* {@code subprimeQLen}, or {@code seedLen} is illegal per the
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* specification of FIPS 186-3.
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*/
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public DSAGenParameterSpec(int primePLen, int subprimeQLen, int seedLen) {
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switch (primePLen) {
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case 1024:
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if (subprimeQLen != 160) {
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throw new IllegalArgumentException
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("subprimeQLen must be 160 when primePLen=1024");
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}
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break;
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case 2048:
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if (subprimeQLen != 224 && subprimeQLen != 256) {
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throw new IllegalArgumentException
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("subprimeQLen must be 224 or 256 when primePLen=2048");
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}
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break;
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case 3072:
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if (subprimeQLen != 256) {
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throw new IllegalArgumentException
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("subprimeQLen must be 256 when primePLen=3072");
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}
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break;
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default:
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throw new IllegalArgumentException
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("primePLen must be 1024, 2048, or 3072");
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}
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if (seedLen < subprimeQLen) {
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throw new IllegalArgumentException
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("seedLen must be equal to or greater than subprimeQLen");
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}
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this.pLen = primePLen;
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this.qLen = subprimeQLen;
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this.seedLen = seedLen;
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}
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/**
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* Returns the desired length of the prime P of the
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* to-be-generated DSA domain parameters in bits.
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* @return the length of the prime P.
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*/
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public int getPrimePLength() {
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return pLen;
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}
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/**
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* Returns the desired length of the sub-prime Q of the
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* to-be-generated DSA domain parameters in bits.
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* @return the length of the sub-prime Q.
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*/
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public int getSubprimeQLength() {
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return qLen;
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}
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/**
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* Returns the desired length of the domain parameter seed in bits.
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* @return the length of the domain parameter seed.
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*/
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public int getSeedLength() {
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return seedLen;
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}
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}
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