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package com.sun.crypto.provider;

import java.util.Arrays;
import java.nio.ByteBuffer;

import javax.crypto.MacSpi;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import java.security.*;
import java.security.spec.*;

This is an implementation of the HMAC-PBESHA1 algorithm as defined in PKCS#12 v1.0 standard.
Author:Valerie Peng
/** * This is an implementation of the HMAC-PBESHA1 algorithm as defined * in PKCS#12 v1.0 standard. * * @author Valerie Peng */
public final class HmacPKCS12PBESHA1 extends HmacCore {
Standard constructor, creates a new HmacSHA1 instance.
/** * Standard constructor, creates a new HmacSHA1 instance. */
public HmacPKCS12PBESHA1() throws NoSuchAlgorithmException { super("SHA1", 64); }
Initializes the HMAC with the given secret key and algorithm parameters.
Params:
  • key – the secret key.
  • params – the algorithm parameters.
Throws:
/** * Initializes the HMAC with the given secret key and algorithm parameters. * * @param key the secret key. * @param params the algorithm parameters. * * @exception InvalidKeyException if the given key is inappropriate for * initializing this MAC. * @exception InvalidAlgorithmParameterException if the given algorithm * parameters are inappropriate for this MAC. */
protected void engineInit(Key key, AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException { char[] passwdChars; byte[] salt = null; int iCount = 0; if (key instanceof javax.crypto.interfaces.PBEKey) { javax.crypto.interfaces.PBEKey pbeKey = (javax.crypto.interfaces.PBEKey) key; passwdChars = pbeKey.getPassword(); salt = pbeKey.getSalt(); // maybe null if unspecified iCount = pbeKey.getIterationCount(); // maybe 0 if unspecified } else if (key instanceof SecretKey) { byte[] passwdBytes = key.getEncoded(); if ((passwdBytes == null) || !(key.getAlgorithm().regionMatches(true, 0, "PBE", 0, 3))) { throw new InvalidKeyException("Missing password"); } passwdChars = new char[passwdBytes.length]; for (int i=0; i<passwdChars.length; i++) { passwdChars[i] = (char) (passwdBytes[i] & 0x7f); } } else { throw new InvalidKeyException("SecretKey of PBE type required"); } if (params == null) { // should not auto-generate default values since current // javax.crypto.Mac api does not have any method for caller to // retrieve the generated defaults. if ((salt == null) || (iCount == 0)) { throw new InvalidAlgorithmParameterException ("PBEParameterSpec required for salt and iteration count"); } } else if (!(params instanceof PBEParameterSpec)) { throw new InvalidAlgorithmParameterException ("PBEParameterSpec type required"); } else { PBEParameterSpec pbeParams = (PBEParameterSpec) params; // make sure the parameter values are consistent if (salt != null) { if (!Arrays.equals(salt, pbeParams.getSalt())) { throw new InvalidAlgorithmParameterException ("Inconsistent value of salt between key and params"); } } else { salt = pbeParams.getSalt(); } if (iCount != 0) { if (iCount != pbeParams.getIterationCount()) { throw new InvalidAlgorithmParameterException ("Different iteration count between key and params"); } } else { iCount = pbeParams.getIterationCount(); } } // For security purpose, we need to enforce a minimum length // for salt; just require the minimum salt length to be 8-byte // which is what PKCS#5 recommends and openssl does. if (salt.length < 8) { throw new InvalidAlgorithmParameterException ("Salt must be at least 8 bytes long"); } if (iCount <= 0) { throw new InvalidAlgorithmParameterException ("IterationCount must be a positive number"); } byte[] derivedKey = PKCS12PBECipherCore.derive(passwdChars, salt, iCount, engineGetMacLength(), PKCS12PBECipherCore.MAC_KEY); SecretKey cipherKey = new SecretKeySpec(derivedKey, "HmacSHA1"); super.engineInit(cipherKey, null); } }