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package com.sun.crypto.provider;

import java.security.*;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.*;

import sun.security.internal.interfaces.TlsMasterSecret;
import sun.security.internal.spec.TlsMasterSecretParameterSpec;

import static com.sun.crypto.provider.TlsPrfGenerator.*;

KeyGenerator implementation for the SSL/TLS master secret derivation.
Author: Andreas Sterbenz
Since: 1.6
/** * KeyGenerator implementation for the SSL/TLS master secret derivation. * * @author Andreas Sterbenz * @since 1.6 */
public final class TlsMasterSecretGenerator extends KeyGeneratorSpi { private final static String MSG = "TlsMasterSecretGenerator must be " + "initialized using a TlsMasterSecretParameterSpec"; private TlsMasterSecretParameterSpec spec; private int protocolVersion; public TlsMasterSecretGenerator() { } protected void engineInit(SecureRandom random) { throw new InvalidParameterException(MSG); } protected void engineInit(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException { if (params instanceof TlsMasterSecretParameterSpec == false) { throw new InvalidAlgorithmParameterException(MSG); } this.spec = (TlsMasterSecretParameterSpec)params; if ("RAW".equals(spec.getPremasterSecret().getFormat()) == false) { throw new InvalidAlgorithmParameterException( "Key format must be RAW"); } protocolVersion = (spec.getMajorVersion() << 8) | spec.getMinorVersion(); if ((protocolVersion < 0x0300) || (protocolVersion > 0x0303)) { throw new InvalidAlgorithmParameterException( "Only SSL 3.0, TLS 1.0/1.1/1.2 supported"); } } protected void engineInit(int keysize, SecureRandom random) { throw new InvalidParameterException(MSG); } protected SecretKey engineGenerateKey() { if (spec == null) { throw new IllegalStateException( "TlsMasterSecretGenerator must be initialized"); } SecretKey premasterKey = spec.getPremasterSecret(); byte[] premaster = premasterKey.getEncoded(); int premasterMajor, premasterMinor; if (premasterKey.getAlgorithm().equals("TlsRsaPremasterSecret")) { // RSA premasterMajor = premaster[0] & 0xff; premasterMinor = premaster[1] & 0xff; } else { // DH, KRB5, others premasterMajor = -1; premasterMinor = -1; } try { byte[] master; if (protocolVersion >= 0x0301) { byte[] label; byte[] seed; byte[] extendedMasterSecretSessionHash = spec.getExtendedMasterSecretSessionHash(); if (extendedMasterSecretSessionHash.length != 0) { label = LABEL_EXTENDED_MASTER_SECRET; seed = extendedMasterSecretSessionHash; } else { byte[] clientRandom = spec.getClientRandom(); byte[] serverRandom = spec.getServerRandom(); label = LABEL_MASTER_SECRET; seed = concat(clientRandom, serverRandom); } master = ((protocolVersion >= 0x0303) ? doTLS12PRF(premaster, label, seed, 48, spec.getPRFHashAlg(), spec.getPRFHashLength(), spec.getPRFBlockSize()) : doTLS10PRF(premaster, label, seed, 48)); } else { master = new byte[48]; MessageDigest md5 = MessageDigest.getInstance("MD5"); MessageDigest sha = MessageDigest.getInstance("SHA"); byte[] clientRandom = spec.getClientRandom(); byte[] serverRandom = spec.getServerRandom(); byte[] tmp = new byte[20]; for (int i = 0; i < 3; i++) { sha.update(SSL3_CONST[i]); sha.update(premaster); sha.update(clientRandom); sha.update(serverRandom); sha.digest(tmp, 0, 20); md5.update(premaster); md5.update(tmp); md5.digest(master, i << 4, 16); } } return new TlsMasterSecretKey(master, premasterMajor, premasterMinor); } catch (NoSuchAlgorithmException e) { throw new ProviderException(e); } catch (DigestException e) { throw new ProviderException(e); } } private static final class TlsMasterSecretKey implements TlsMasterSecret { private static final long serialVersionUID = 1019571680375368880L; private byte[] key; private final int majorVersion, minorVersion; TlsMasterSecretKey(byte[] key, int majorVersion, int minorVersion) { this.key = key; this.majorVersion = majorVersion; this.minorVersion = minorVersion; } public int getMajorVersion() { return majorVersion; } public int getMinorVersion() { return minorVersion; } public String getAlgorithm() { return "TlsMasterSecret"; } public String getFormat() { return "RAW"; } public byte[] getEncoded() { return key.clone(); } } }