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package org.bouncycastle.asn1.pkcs;

import java.math.BigInteger;
import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;

/**
 * 
 *     PBKDF2-params ::= SEQUENCE {
 *               salt CHOICE {
 *                      specified OCTET STRING,
 *                      otherSource AlgorithmIdentifier {{PBKDF2-SaltSources}}
 *               },
 *              iterationCount INTEGER (1..MAX),
 *              keyLength INTEGER (1..MAX) OPTIONAL,
 *              prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1 }
 * 
*/ public class PBKDF2Params extends ASN1Object { private static final AlgorithmIdentifier algid_hmacWithSHA1 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA1, DERNull.INSTANCE); private final ASN1OctetString octStr; private final ASN1Integer iterationCount; private final ASN1Integer keyLength; private final AlgorithmIdentifier prf; /** * Create PBKDF2Params from the passed in object, * * @param obj either PBKDF2Params or an ASN1Sequence. * @return a PBKDF2Params instance. */ public static PBKDF2Params getInstance( Object obj) { if (obj instanceof PBKDF2Params) { return (PBKDF2Params)obj; } if (obj != null) { return new PBKDF2Params(ASN1Sequence.getInstance(obj)); } return null; } /** * Create a PBKDF2Params with the specified salt, iteration count, and algid-hmacWithSHA1 for the prf. * * @param salt input salt. * @param iterationCount input iteration count. */ public PBKDF2Params( byte[] salt, int iterationCount) { this(salt, iterationCount, 0); } /** * Create a PBKDF2Params with the specified salt, iteration count, keyLength, and algid-hmacWithSHA1 for the prf. * * @param salt input salt. * @param iterationCount input iteration count. * @param keyLength intended key length to be produced. */ public PBKDF2Params( byte[] salt, int iterationCount, int keyLength) { this(salt, iterationCount, keyLength, null); } /** * Create a PBKDF2Params with the specified salt, iteration count, keyLength, and a defined prf. * * @param salt input salt. * @param iterationCount input iteration count. * @param keyLength intended key length to be produced. * @param prf the pseudo-random function to use. */ public PBKDF2Params( byte[] salt, int iterationCount, int keyLength, AlgorithmIdentifier prf) { this.octStr = new DEROctetString(Arrays.clone(salt)); this.iterationCount = new ASN1Integer(iterationCount); if (keyLength > 0) { this.keyLength = new ASN1Integer(keyLength); } else { this.keyLength = null; } this.prf = prf; } /** * Create a PBKDF2Params with the specified salt, iteration count, and a defined prf. * * @param salt input salt. * @param iterationCount input iteration count. * @param prf the pseudo-random function to use. */ public PBKDF2Params( byte[] salt, int iterationCount, AlgorithmIdentifier prf) { this(salt, iterationCount, 0, prf); } private PBKDF2Params( ASN1Sequence seq) { Enumeration e = seq.getObjects(); octStr = (ASN1OctetString)e.nextElement(); iterationCount = (ASN1Integer)e.nextElement(); if (e.hasMoreElements()) { Object o = e.nextElement(); if (o instanceof ASN1Integer) { keyLength = ASN1Integer.getInstance(o); if (e.hasMoreElements()) { o = e.nextElement(); } else { o = null; } } else { keyLength = null; } if (o != null) { prf = AlgorithmIdentifier.getInstance(o); } else { prf = null; } } else { keyLength = null; prf = null; } } /** * Return the salt to use. * * @return the input salt. */ public byte[] getSalt() { return octStr.getOctets(); } /** * Return the iteration count to use. * * @return the input iteration count. */ public BigInteger getIterationCount() { return iterationCount.getValue(); } /** * Return the intended length in octets of the derived key. * * @return length in octets for derived key, if specified. */ public BigInteger getKeyLength() { if (keyLength != null) { return keyLength.getValue(); } return null; } /** * Return true if the PRF is the default (hmacWithSHA1) * * @return true if PRF is default, false otherwise. */ public boolean isDefaultPrf() { return prf == null || prf.equals(algid_hmacWithSHA1); } /** * Return the algId of the underlying pseudo random function to use. * * @return the prf algorithm identifier. */ public AlgorithmIdentifier getPrf() { if (prf != null) { return prf; } return algid_hmacWithSHA1; } /** * Return an ASN.1 structure suitable for encoding. * * @return the object as an ASN.1 encodable structure. */ public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(octStr); v.add(iterationCount); if (keyLength != null) { v.add(keyLength); } if (prf != null && !prf.equals(algid_hmacWithSHA1)) { v.add(prf); } return new DERSequence(v); } }




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