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package com.sun.crypto.provider;

import java.math.BigInteger;
import java.security.*;
import java.security.spec.*;
import java.util.Arrays;
import javax.crypto.*;
import javax.crypto.spec.*;

This class implements password-base encryption algorithm with SHA1 digest and the following Ciphers (in CBC mode, where applicable): - DESede cipher and - RC2 Cipher with 40-bit or 128-bit effective key length and - RC4 Cipher with 40-bit or 128-bit effective key length as defined by PKCS #12 version 1.0 standard.
Author:Valerie Peng
See Also:
/** * This class implements password-base encryption algorithm with * SHA1 digest and the following Ciphers (in CBC mode, where applicable): * - DESede cipher and * - RC2 Cipher with 40-bit or 128-bit effective key length and * - RC4 Cipher with 40-bit or 128-bit effective key length * as defined by PKCS #12 version 1.0 standard. * * @author Valerie Peng * @see javax.crypto.CipherSpi */
final class PKCS12PBECipherCore { // TBD: replace CipherCore with a CipherSpi object to simplify maintenance private CipherCore cipher; private int blockSize; private int keySize; private String algo = null; private String pbeAlgo = null; private byte[] salt = null; private int iCount = 0; private static final int DEFAULT_SALT_LENGTH = 20; private static final int DEFAULT_COUNT = 1024; static final int CIPHER_KEY = 1; static final int CIPHER_IV = 2; static final int MAC_KEY = 3; // Uses default hash algorithm (SHA-1) static byte[] derive(char[] chars, byte[] salt, int ic, int n, int type) { return derive(chars, salt, ic, n, type, "SHA-1", 64); } // Uses supplied hash algorithm static byte[] derive(char[] chars, byte[] salt, int ic, int n, int type, String hashAlgo, int blockLength) { // Add in trailing NULL terminator. Special case: // no terminator if password is "\0". int length = chars.length*2; if (length == 2 && chars[0] == 0) { chars = new char[0]; length = 0; } else { length += 2; } byte[] passwd = new byte[length]; for (int i = 0, j = 0; i < chars.length; i++, j+=2) { passwd[j] = (byte) ((chars[i] >>> 8) & 0xFF); passwd[j+1] = (byte) (chars[i] & 0xFF); } byte[] key = new byte[n]; try { MessageDigest sha = MessageDigest.getInstance(hashAlgo); int v = blockLength; int u = sha.getDigestLength(); int c = roundup(n, u) / u; byte[] D = new byte[v]; int s = roundup(salt.length, v); int p = roundup(passwd.length, v); byte[] I = new byte[s + p]; Arrays.fill(D, (byte)type); concat(salt, I, 0, s); concat(passwd, I, s, p); Arrays.fill(passwd, (byte)0x00); byte[] Ai; byte[] B = new byte[v]; byte[] tmp = new byte[v]; int i = 0; for (; ; i++, n -= u) { sha.update(D); sha.update(I); Ai = sha.digest(); for (int r = 1; r < ic; r++) Ai = sha.digest(Ai); System.arraycopy(Ai, 0, key, u * i, Math.min(n, u)); if (i + 1 == c) break; concat(Ai, B, 0, B.length); BigInteger B1; B1 = new BigInteger(1, B).add(BigInteger.ONE); for (int j = 0; j < I.length; j += v) { BigInteger Ij; int trunc; if (tmp.length != v) tmp = new byte[v]; System.arraycopy(I, j, tmp, 0, v); Ij = new BigInteger(1, tmp); Ij = Ij.add(B1); tmp = Ij.toByteArray(); trunc = tmp.length - v; if (trunc >= 0) { System.arraycopy(tmp, trunc, I, j, v); } else if (trunc < 0) { Arrays.fill(I, j, j + (-trunc), (byte)0); System.arraycopy(tmp, 0, I, j + (-trunc), tmp.length); } } } } catch (Exception e) { throw new RuntimeException("internal error: " + e); } return key; } private static int roundup(int x, int y) { return ((x + (y - 1)) / y) * y; } private static void concat(byte[] src, byte[] dst, int start, int len) { if (src.length == 0) { return; } int loop = len / src.length; int off, i; for (i = 0, off = 0; i < loop; i++, off += src.length) System.arraycopy(src, 0, dst, off + start, src.length); System.arraycopy(src, 0, dst, off + start, len - off); } PKCS12PBECipherCore(String symmCipherAlg, int defKeySize) throws NoSuchAlgorithmException { algo = symmCipherAlg; if (algo.equals("RC4")) { pbeAlgo = "PBEWithSHA1AndRC4_" + defKeySize * 8; } else { SymmetricCipher symmCipher = null; if (algo.equals("DESede")) { symmCipher = new DESedeCrypt(); pbeAlgo = "PBEWithSHA1AndDESede"; } else if (algo.equals("RC2")) { symmCipher = new RC2Crypt(); pbeAlgo = "PBEWithSHA1AndRC2_" + defKeySize * 8; } else { throw new NoSuchAlgorithmException("No Cipher implementation " + "for PBEWithSHA1And" + algo); } blockSize = symmCipher.getBlockSize(); cipher = new CipherCore(symmCipher, blockSize); cipher.setMode("CBC"); try { cipher.setPadding("PKCS5Padding"); } catch (NoSuchPaddingException nspe) { // should not happen } } keySize = defKeySize; } void implSetMode(String mode) throws NoSuchAlgorithmException { if ((mode != null) && (!mode.equalsIgnoreCase("CBC"))) { throw new NoSuchAlgorithmException("Invalid cipher mode: " + mode); } } void implSetPadding(String padding) throws NoSuchPaddingException { if ((padding != null) && (!padding.equalsIgnoreCase("PKCS5Padding"))) { throw new NoSuchPaddingException("Invalid padding scheme: " + padding); } } int implGetBlockSize() { return blockSize; } int implGetOutputSize(int inLen) { return cipher.getOutputSize(inLen); } byte[] implGetIV() { return cipher.getIV(); } AlgorithmParameters implGetParameters() { AlgorithmParameters params = null; if (salt == null) { // Cipher is not initialized with parameters; // follow the recommendation in PKCS12 v1.0 // section B.4 to generate salt and iCount. salt = new byte[DEFAULT_SALT_LENGTH]; SunJCE.getRandom().nextBytes(salt); iCount = DEFAULT_COUNT; } PBEParameterSpec pbeSpec = new PBEParameterSpec(salt, iCount); try { params = AlgorithmParameters.getInstance(pbeAlgo, SunJCE.getInstance()); params.init(pbeSpec); } catch (NoSuchAlgorithmException nsae) { // should never happen throw new RuntimeException( "SunJCE provider is not configured properly"); } catch (InvalidParameterSpecException ipse) { // should never happen throw new RuntimeException("PBEParameterSpec not supported"); } return params; } void implInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { implInit(opmode, key, params, random, null); } void implInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random, CipherSpi cipherImpl) throws InvalidKeyException, InvalidAlgorithmParameterException { char[] passwdChars = null; salt = null; 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; if (!(key.getAlgorithm().regionMatches(true, 0, "PBE", 0, 3)) || (passwdBytes = key.getEncoded()) == null) { throw new InvalidKeyException("Missing password"); } passwdChars = new char[passwdBytes.length]; for (int i=0; i<passwdChars.length; i++) { passwdChars[i] = (char) (passwdBytes[i] & 0x7f); } Arrays.fill(passwdBytes, (byte)0x00); } else { throw new InvalidKeyException("SecretKey of PBE type required"); } try { if (((opmode == Cipher.DECRYPT_MODE) || (opmode == Cipher.UNWRAP_MODE)) && ((params == null) && ((salt == null) || (iCount == 0)))) { throw new InvalidAlgorithmParameterException ("Parameters missing"); } if (params == null) { // generate default for salt and iteration count if necessary if (salt == null) { salt = new byte[DEFAULT_SALT_LENGTH]; if (random != null) { random.nextBytes(salt); } else { SunJCE.getRandom().nextBytes(salt); } } if (iCount == 0) iCount = DEFAULT_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(); } } // salt is recommended to be ideally as long as the output // of the hash function. However, it may be too strict to // force this; so instead, we'll 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 = derive(passwdChars, salt, iCount, keySize, CIPHER_KEY); SecretKey cipherKey = new SecretKeySpec(derivedKey, algo); if (cipherImpl != null && cipherImpl instanceof ARCFOURCipher) { ((ARCFOURCipher)cipherImpl).engineInit(opmode, cipherKey, random); } else { byte[] derivedIv = derive(passwdChars, salt, iCount, 8, CIPHER_IV); IvParameterSpec ivSpec = new IvParameterSpec(derivedIv, 0, 8); // initialize the underlying cipher cipher.init(opmode, cipherKey, ivSpec, random); } } finally { Arrays.fill(passwdChars, '\0'); } } void implInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { implInit(opmode, key, params, random, null); } void implInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random, CipherSpi cipherImpl) throws InvalidKeyException, InvalidAlgorithmParameterException { AlgorithmParameterSpec paramSpec = null; if (params != null) { try { paramSpec = params.getParameterSpec(PBEParameterSpec.class); } catch (InvalidParameterSpecException ipse) { throw new InvalidAlgorithmParameterException( "requires PBE parameters"); } } implInit(opmode, key, paramSpec, random, cipherImpl); } void implInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { implInit(opmode, key, random, null); } void implInit(int opmode, Key key, SecureRandom random, CipherSpi cipherImpl) throws InvalidKeyException { try { implInit(opmode, key, (AlgorithmParameterSpec) null, random, cipherImpl); } catch (InvalidAlgorithmParameterException iape) { throw new InvalidKeyException("requires PBE parameters"); } } byte[] implUpdate(byte[] in, int inOff, int inLen) { return cipher.update(in, inOff, inLen); } int implUpdate(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException { return cipher.update(in, inOff, inLen, out, outOff); } byte[] implDoFinal(byte[] in, int inOff, int inLen) throws IllegalBlockSizeException, BadPaddingException { return cipher.doFinal(in, inOff, inLen); } int implDoFinal(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException { return cipher.doFinal(in, inOff, inLen, out, outOff); } int implGetKeySize(Key key) throws InvalidKeyException { return keySize; } byte[] implWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { return cipher.wrap(key); } Key implUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException { return cipher.unwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType); } public static final class PBEWithSHA1AndDESede extends CipherSpi { private final PKCS12PBECipherCore core; public PBEWithSHA1AndDESede() throws NoSuchAlgorithmException { core = new PKCS12PBECipherCore("DESede", 24); } protected byte[] engineDoFinal(byte[] in, int inOff, int inLen) throws IllegalBlockSizeException, BadPaddingException { return core.implDoFinal(in, inOff, inLen); } protected int engineDoFinal(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException { return core.implDoFinal(in, inOff, inLen, out, outOff); } protected int engineGetBlockSize() { return core.implGetBlockSize(); } protected byte[] engineGetIV() { return core.implGetIV(); } protected int engineGetKeySize(Key key) throws InvalidKeyException { return core.implGetKeySize(key); } protected int engineGetOutputSize(int inLen) { return core.implGetOutputSize(inLen); } protected AlgorithmParameters engineGetParameters() { return core.implGetParameters(); } protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random); } protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random); } protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { core.implInit(opmode, key, random); } protected void engineSetMode(String mode) throws NoSuchAlgorithmException { core.implSetMode(mode); } protected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException { core.implSetPadding(paddingScheme); } protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException { return core.implUnwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType); } protected byte[] engineUpdate(byte[] in, int inOff, int inLen) { return core.implUpdate(in, inOff, inLen); } protected int engineUpdate(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException { return core.implUpdate(in, inOff, inLen, out, outOff); } protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { return core.implWrap(key); } } public static final class PBEWithSHA1AndRC2_40 extends CipherSpi { private final PKCS12PBECipherCore core; public PBEWithSHA1AndRC2_40() throws NoSuchAlgorithmException { core = new PKCS12PBECipherCore("RC2", 5); } protected byte[] engineDoFinal(byte[] in, int inOff, int inLen) throws IllegalBlockSizeException, BadPaddingException { return core.implDoFinal(in, inOff, inLen); } protected int engineDoFinal(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException { return core.implDoFinal(in, inOff, inLen, out, outOff); } protected int engineGetBlockSize() { return core.implGetBlockSize(); } protected byte[] engineGetIV() { return core.implGetIV(); } protected int engineGetKeySize(Key key) throws InvalidKeyException { return core.implGetKeySize(key); } protected int engineGetOutputSize(int inLen) { return core.implGetOutputSize(inLen); } protected AlgorithmParameters engineGetParameters() { return core.implGetParameters(); } protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random); } protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random); } protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { core.implInit(opmode, key, random); } protected void engineSetMode(String mode) throws NoSuchAlgorithmException { core.implSetMode(mode); } protected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException { core.implSetPadding(paddingScheme); } protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException { return core.implUnwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType); } protected byte[] engineUpdate(byte[] in, int inOff, int inLen) { return core.implUpdate(in, inOff, inLen); } protected int engineUpdate(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException { return core.implUpdate(in, inOff, inLen, out, outOff); } protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { return core.implWrap(key); } } public static final class PBEWithSHA1AndRC2_128 extends CipherSpi { private final PKCS12PBECipherCore core; public PBEWithSHA1AndRC2_128() throws NoSuchAlgorithmException { core = new PKCS12PBECipherCore("RC2", 16); } protected byte[] engineDoFinal(byte[] in, int inOff, int inLen) throws IllegalBlockSizeException, BadPaddingException { return core.implDoFinal(in, inOff, inLen); } protected int engineDoFinal(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException { return core.implDoFinal(in, inOff, inLen, out, outOff); } protected int engineGetBlockSize() { return core.implGetBlockSize(); } protected byte[] engineGetIV() { return core.implGetIV(); } protected int engineGetKeySize(Key key) throws InvalidKeyException { return core.implGetKeySize(key); } protected int engineGetOutputSize(int inLen) { return core.implGetOutputSize(inLen); } protected AlgorithmParameters engineGetParameters() { return core.implGetParameters(); } protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random); } protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random); } protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { core.implInit(opmode, key, random); } protected void engineSetMode(String mode) throws NoSuchAlgorithmException { core.implSetMode(mode); } protected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException { core.implSetPadding(paddingScheme); } protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException { return core.implUnwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType); } protected byte[] engineUpdate(byte[] in, int inOff, int inLen) { return core.implUpdate(in, inOff, inLen); } protected int engineUpdate(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException { return core.implUpdate(in, inOff, inLen, out, outOff); } protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { return core.implWrap(key); } } public static final class PBEWithSHA1AndRC4_40 extends CipherSpi { private static final int RC4_KEYSIZE = 5; private final PKCS12PBECipherCore core; private final ARCFOURCipher cipher; public PBEWithSHA1AndRC4_40() throws NoSuchAlgorithmException { core = new PKCS12PBECipherCore("RC4", RC4_KEYSIZE); cipher = new ARCFOURCipher(); } protected byte[] engineDoFinal(byte[] in, int inOff, int inLen) throws IllegalBlockSizeException, BadPaddingException { return cipher.engineDoFinal(in, inOff, inLen); } protected int engineDoFinal(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException { return cipher.engineDoFinal(in, inOff, inLen, out, outOff); } protected int engineGetBlockSize() { return cipher.engineGetBlockSize(); } protected byte[] engineGetIV() { return cipher.engineGetIV(); } protected int engineGetKeySize(Key key) throws InvalidKeyException { return RC4_KEYSIZE; } protected int engineGetOutputSize(int inLen) { return cipher.engineGetOutputSize(inLen); } protected AlgorithmParameters engineGetParameters() { return core.implGetParameters(); } protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random, cipher); } protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random, cipher); } protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { core.implInit(opmode, key, random, cipher); } protected void engineSetMode(String mode) throws NoSuchAlgorithmException { if (mode.equalsIgnoreCase("ECB") == false) { throw new NoSuchAlgorithmException("Unsupported mode " + mode); } } protected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException { if (paddingScheme.equalsIgnoreCase("NoPadding") == false) { throw new NoSuchPaddingException("Padding must be NoPadding"); } } protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException { return cipher.engineUnwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType); } protected byte[] engineUpdate(byte[] in, int inOff, int inLen) { return cipher.engineUpdate(in, inOff, inLen); } protected int engineUpdate(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException { return cipher.engineUpdate(in, inOff, inLen, out, outOff); } protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { return cipher.engineWrap(key); } } public static final class PBEWithSHA1AndRC4_128 extends CipherSpi { private static final int RC4_KEYSIZE = 16; private final PKCS12PBECipherCore core; private final ARCFOURCipher cipher; public PBEWithSHA1AndRC4_128() throws NoSuchAlgorithmException { core = new PKCS12PBECipherCore("RC4", RC4_KEYSIZE); cipher = new ARCFOURCipher(); } protected byte[] engineDoFinal(byte[] in, int inOff, int inLen) throws IllegalBlockSizeException, BadPaddingException { return cipher.engineDoFinal(in, inOff, inLen); } protected int engineDoFinal(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException { return cipher.engineDoFinal(in, inOff, inLen, out, outOff); } protected int engineGetBlockSize() { return cipher.engineGetBlockSize(); } protected byte[] engineGetIV() { return cipher.engineGetIV(); } protected int engineGetKeySize(Key key) throws InvalidKeyException { return RC4_KEYSIZE; } protected int engineGetOutputSize(int inLen) { return cipher.engineGetOutputSize(inLen); } protected AlgorithmParameters engineGetParameters() { return core.implGetParameters(); } protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random, cipher); } protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { core.implInit(opmode, key, params, random, cipher); } protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { core.implInit(opmode, key, random, cipher); } protected void engineSetMode(String mode) throws NoSuchAlgorithmException { if (mode.equalsIgnoreCase("ECB") == false) { throw new NoSuchAlgorithmException("Unsupported mode " + mode); } } protected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException { if (paddingScheme.equalsIgnoreCase("NoPadding") == false) { throw new NoSuchPaddingException("Padding must be NoPadding"); } } protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException { return cipher.engineUnwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType); } protected byte[] engineUpdate(byte[] in, int inOff, int inLen) { return cipher.engineUpdate(in, inOff, inLen); } protected int engineUpdate(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws ShortBufferException { return cipher.engineUpdate(in, inOff, inLen, out, outOff); } protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { return cipher.engineWrap(key); } } }