/**
* This call, used by the constructors, instantiates the SHA digest and sets the seed, if given.
*/
private void init(byte[] seed) {
try {
digest = MessageDigest.getInstance("SHA");
} catch (NoSuchAlgorithmException e) {
throw new InternalError("internal error: SHA-1 not available.", e);
}
if (seed != null) {
engineSetSeed(seed);
}
}
/*
* readObject is called to restore the state of the random object from
* a stream. We have to create a new instance of MessageDigest, because
* it is not included in the stream (it is marked "transient").
*
* Note that the engineNextBytes() method invoked on the restored random
* object will yield the exact same (random) bytes as the original.
* If you do not want this behaviour, you should re-seed the restored
* random object, using engineSetSeed().
*/
private void readObject(j86.java.io.ObjectInputStream s)
throws IOException, ClassNotFoundException {
s.defaultReadObject();
try {
digest = MessageDigest.getInstance("SHA");
} catch (NoSuchAlgorithmException e) {
throw new InternalError("internal error: SHA-1 not available.", e);
}
}
static byte[] doTLS12PRF(
byte[] secret,
byte[] labelBytes,
byte[] seed,
int outputLength,
String prfHash,
int prfHashLength,
int prfBlockSize)
throws NoSuchAlgorithmException, DigestException {
if (prfHash == null) {
throw new NoSuchAlgorithmException("Unspecified PRF algorithm");
}
MessageDigest prfMD = MessageDigest.getInstance(prfHash);
return doTLS12PRF(secret, labelBytes, seed, outputLength, prfMD, prfHashLength, prfBlockSize);
}
static byte[] doTLS10PRF(byte[] secret, byte[] labelBytes, byte[] seed, int outputLength)
throws NoSuchAlgorithmException, DigestException {
MessageDigest md5 = MessageDigest.getInstance("MD5");
MessageDigest sha = MessageDigest.getInstance("SHA1");
return doTLS10PRF(secret, labelBytes, seed, outputLength, md5, sha);
}