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;
}
}
