MacData(String algName, byte[] digest, byte[] salt, int iterations) throws NoSuchAlgorithmException { if (algName == null) throw new NullPointerException("the algName parameter " + "must be non-null"); AlgorithmId algid = AlgorithmId.get(algName); this.digestAlgorithmName = algid.getName(); this.digestAlgorithmParams = algid.getParameters(); if (digest == null) { throw new NullPointerException("the digest " + "parameter must be non-null"); } else if (digest.length == 0) { throw new IllegalArgumentException("the digest " + "parameter must not be empty"); } else { this.digest = digest.clone(); } this.macSalt = salt; this.iterations = iterations; // delay the generation of ASN.1 encoding until // getEncoded() is called this.encoded = null; }
/** Parses a PKCS#12 MAC data. */ MacData(DerInputStream derin) throws IOException, ParsingException { DerValue[] macData = derin.getSequence(2); // Parse the digest info DerInputStream digestIn = new DerInputStream(macData[0].toByteArray()); DerValue[] digestInfo = digestIn.getSequence(2); // Parse the DigestAlgorithmIdentifier. AlgorithmId digestAlgorithmId = AlgorithmId.parse(digestInfo[0]); this.digestAlgorithmName = digestAlgorithmId.getName(); this.digestAlgorithmParams = digestAlgorithmId.getParameters(); // Get the digest. this.digest = digestInfo[1].getOctetString(); // Get the salt. this.macSalt = macData[1].getOctetString(); // Iterations is optional. The default value is 1. if (macData.length > 2) { this.iterations = macData[2].getInteger(); } else { this.iterations = 1; } }