| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.conscrypt; |
| |
| import java.io.IOException; |
| import java.security.AlgorithmParameters; |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.InvalidKeyException; |
| import java.security.InvalidParameterException; |
| import java.security.Key; |
| import java.security.KeyFactory; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.SecureRandom; |
| import java.security.spec.AlgorithmParameterSpec; |
| import java.security.spec.InvalidKeySpecException; |
| import java.security.spec.InvalidParameterSpecException; |
| import java.security.spec.PKCS8EncodedKeySpec; |
| import java.security.spec.X509EncodedKeySpec; |
| import java.util.Arrays; |
| import java.util.Locale; |
| import javax.crypto.BadPaddingException; |
| import javax.crypto.Cipher; |
| import javax.crypto.CipherSpi; |
| import javax.crypto.IllegalBlockSizeException; |
| import javax.crypto.NoSuchPaddingException; |
| import javax.crypto.SecretKey; |
| import javax.crypto.ShortBufferException; |
| import javax.crypto.spec.IvParameterSpec; |
| import javax.crypto.spec.SecretKeySpec; |
| import org.conscrypt.util.EmptyArray; |
| import org.conscrypt.NativeConstants; |
| import org.conscrypt.NativeRef.EVP_CIPHER_CTX; |
| |
| public abstract class OpenSSLCipher extends CipherSpi { |
| |
| /** |
| * Modes that a block cipher may support. |
| */ |
| protected static enum Mode { |
| CBC, |
| CTR, |
| ECB, |
| } |
| |
| /** |
| * Paddings that a block cipher may support. |
| */ |
| protected static enum Padding { |
| NOPADDING, |
| PKCS5PADDING, |
| ISO10126PADDING, |
| } |
| |
| /** |
| * The current cipher mode. |
| */ |
| protected Mode mode = Mode.ECB; |
| |
| /** |
| * The current cipher padding. |
| */ |
| private Padding padding = Padding.PKCS5PADDING; |
| |
| /** |
| * May be used when reseting the cipher instance after calling |
| * {@code doFinal}. |
| */ |
| protected byte[] encodedKey; |
| |
| /** |
| * The Initial Vector (IV) used for the current cipher. |
| */ |
| protected byte[] iv; |
| |
| /** |
| * Current cipher mode: encrypting or decrypting. |
| */ |
| private boolean encrypting; |
| |
| /** |
| * The block size of the current cipher. |
| */ |
| private int blockSize; |
| |
| protected OpenSSLCipher() { |
| } |
| |
| protected OpenSSLCipher(Mode mode, Padding padding) { |
| this.mode = mode; |
| this.padding = padding; |
| blockSize = getCipherBlockSize(); |
| } |
| |
| /** |
| * API-specific implementation of initializing the cipher. The |
| * {@link #isEncrypting()} function will tell whether it should be |
| * initialized for encryption or decryption. The {@code encodedKey} will be |
| * the bytes of a supported key size. |
| */ |
| protected abstract void engineInitInternal(byte[] encodedKey, AlgorithmParameterSpec params, |
| SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException; |
| |
| /** |
| * API-specific implementation of updating the cipher. The |
| * {@code maximumLen} will be the maximum length of the output as returned |
| * by {@link #getOutputSizeForUpdate(int)}. The return value must be the |
| * number of bytes processed and placed into {@code output}. On error, an |
| * exception must be thrown. |
| */ |
| protected abstract int updateInternal(byte[] input, int inputOffset, int inputLen, |
| byte[] output, int outputOffset, int maximumLen) throws ShortBufferException; |
| |
| /** |
| * API-specific implementation of the final block. The {@code maximumLen} |
| * will be the maximum length of the possible output as returned by |
| * {@link #getOutputSizeForFinal(int)}. The return value must be the number |
| * of bytes processed and placed into {@code output}. On error, an exception |
| * must be thrown. |
| */ |
| protected abstract int doFinalInternal(byte[] output, int outputOffset, int maximumLen) |
| throws IllegalBlockSizeException, BadPaddingException, ShortBufferException; |
| |
| /** |
| * Returns the standard name for the particular algorithm. |
| */ |
| protected abstract String getBaseCipherName(); |
| |
| /** |
| * Checks whether the cipher supports this particular {@code keySize} (in |
| * bytes) and throws {@code InvalidKeyException} if it doesn't. |
| */ |
| protected abstract void checkSupportedKeySize(int keySize) throws InvalidKeyException; |
| |
| /** |
| * Checks whether the cipher supports this particular cipher {@code mode} |
| * and throws {@code NoSuchAlgorithmException} if it doesn't. |
| */ |
| protected abstract void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException; |
| |
| /** |
| * Checks whether the cipher supports this particular cipher {@code padding} |
| * and throws {@code NoSuchPaddingException} if it doesn't. |
| */ |
| protected abstract void checkSupportedPadding(Padding padding) throws NoSuchPaddingException; |
| |
| protected abstract int getCipherBlockSize(); |
| |
| protected boolean supportsVariableSizeKey() { |
| return false; |
| } |
| |
| protected boolean supportsVariableSizeIv() { |
| return false; |
| } |
| |
| @Override |
| protected void engineSetMode(String modeStr) throws NoSuchAlgorithmException { |
| final Mode mode; |
| try { |
| mode = Mode.valueOf(modeStr.toUpperCase(Locale.US)); |
| } catch (IllegalArgumentException e) { |
| NoSuchAlgorithmException newE = new NoSuchAlgorithmException("No such mode: " + modeStr); |
| newE.initCause(e); |
| throw newE; |
| } |
| checkSupportedMode(mode); |
| this.mode = mode; |
| } |
| |
| @Override |
| protected void engineSetPadding(String paddingStr) throws NoSuchPaddingException { |
| final String paddingStrUpper = paddingStr.toUpperCase(Locale.US); |
| final Padding padding; |
| try { |
| padding = Padding.valueOf(paddingStrUpper); |
| } catch (IllegalArgumentException e) { |
| NoSuchPaddingException newE = new NoSuchPaddingException("No such padding: " |
| + paddingStr); |
| newE.initCause(e); |
| throw newE; |
| } |
| checkSupportedPadding(padding); |
| this.padding = padding; |
| } |
| |
| /** |
| * Returns the padding type for which this cipher is initialized. |
| */ |
| protected Padding getPadding() { |
| return padding; |
| } |
| |
| @Override |
| protected int engineGetBlockSize() { |
| return blockSize; |
| } |
| |
| /** |
| * The size of output if {@code doFinal()} is called with this |
| * {@code inputLen}. If padding is enabled and the size of the input puts it |
| * right at the block size, it will add another block for the padding. |
| */ |
| protected abstract int getOutputSizeForFinal(int inputLen); |
| |
| /** |
| * The size of output if {@code update()} is called with this |
| * {@code inputLen}. If padding is enabled and the size of the input puts it |
| * right at the block size, it will add another block for the padding. |
| */ |
| protected abstract int getOutputSizeForUpdate(int inputLen); |
| |
| @Override |
| protected int engineGetOutputSize(int inputLen) { |
| return getOutputSizeForFinal(inputLen); |
| } |
| |
| @Override |
| protected byte[] engineGetIV() { |
| return iv; |
| } |
| |
| @Override |
| protected AlgorithmParameters engineGetParameters() { |
| if (iv != null && iv.length > 0) { |
| try { |
| AlgorithmParameters params = AlgorithmParameters.getInstance(getBaseCipherName()); |
| params.init(iv); |
| return params; |
| } catch (NoSuchAlgorithmException e) { |
| return null; |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { |
| checkAndSetEncodedKey(opmode, key); |
| try { |
| engineInitInternal(this.encodedKey, null, random); |
| } catch (InvalidAlgorithmParameterException e) { |
| // This can't actually happen since we pass in null. |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, |
| SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { |
| checkAndSetEncodedKey(opmode, key); |
| engineInitInternal(this.encodedKey, params, random); |
| } |
| |
| @Override |
| protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| AlgorithmParameterSpec spec; |
| if (params != null) { |
| try { |
| spec = params.getParameterSpec(IvParameterSpec.class); |
| } catch (InvalidParameterSpecException e) { |
| throw new InvalidAlgorithmParameterException( |
| "Params must be convertible to IvParameterSpec", e); |
| } |
| } else { |
| spec = null; |
| } |
| |
| engineInit(opmode, key, spec, random); |
| } |
| |
| @Override |
| protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) { |
| final int maximumLen = getOutputSizeForUpdate(inputLen); |
| |
| /* See how large our output buffer would need to be. */ |
| final byte[] output; |
| if (maximumLen > 0) { |
| output = new byte[maximumLen]; |
| } else { |
| output = EmptyArray.BYTE; |
| } |
| |
| final int bytesWritten; |
| try { |
| bytesWritten = updateInternal(input, inputOffset, inputLen, output, 0, maximumLen); |
| } catch (ShortBufferException e) { |
| /* This shouldn't happen. */ |
| throw new RuntimeException("calculated buffer size was wrong: " + maximumLen); |
| } |
| |
| if (output.length == bytesWritten) { |
| return output; |
| } else if (bytesWritten == 0) { |
| return EmptyArray.BYTE; |
| } else { |
| return Arrays.copyOfRange(output, 0, bytesWritten); |
| } |
| } |
| |
| @Override |
| protected int engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, |
| int outputOffset) throws ShortBufferException { |
| final int maximumLen = getOutputSizeForUpdate(inputLen); |
| return updateInternal(input, inputOffset, inputLen, output, outputOffset, maximumLen); |
| } |
| |
| @Override |
| protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen) |
| throws IllegalBlockSizeException, BadPaddingException { |
| final int maximumLen = getOutputSizeForFinal(inputLen); |
| /* Assume that we'll output exactly on a byte boundary. */ |
| final byte[] output = new byte[maximumLen]; |
| |
| int bytesWritten; |
| if (inputLen > 0) { |
| try { |
| bytesWritten = updateInternal(input, inputOffset, inputLen, output, 0, maximumLen); |
| } catch (ShortBufferException e) { |
| /* This should not happen since we sized our own buffer. */ |
| throw new RuntimeException("our calculated buffer was too small", e); |
| } |
| } else { |
| bytesWritten = 0; |
| } |
| |
| try { |
| bytesWritten += doFinalInternal(output, bytesWritten, maximumLen - bytesWritten); |
| } catch (ShortBufferException e) { |
| /* This should not happen since we sized our own buffer. */ |
| throw new RuntimeException("our calculated buffer was too small", e); |
| } |
| |
| if (bytesWritten == output.length) { |
| return output; |
| } else if (bytesWritten == 0) { |
| return EmptyArray.BYTE; |
| } else { |
| return Arrays.copyOfRange(output, 0, bytesWritten); |
| } |
| } |
| |
| @Override |
| protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, |
| int outputOffset) throws ShortBufferException, IllegalBlockSizeException, |
| BadPaddingException { |
| if (output == null) { |
| throw new NullPointerException("output == null"); |
| } |
| |
| int maximumLen = getOutputSizeForFinal(inputLen); |
| |
| final int bytesWritten; |
| if (inputLen > 0) { |
| bytesWritten = updateInternal(input, inputOffset, inputLen, output, outputOffset, |
| maximumLen); |
| outputOffset += bytesWritten; |
| maximumLen -= bytesWritten; |
| } else { |
| bytesWritten = 0; |
| } |
| |
| return bytesWritten + doFinalInternal(output, outputOffset, maximumLen); |
| } |
| |
| @Override |
| protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { |
| try { |
| byte[] encoded = key.getEncoded(); |
| return engineDoFinal(encoded, 0, encoded.length); |
| } catch (BadPaddingException e) { |
| IllegalBlockSizeException newE = new IllegalBlockSizeException(); |
| newE.initCause(e); |
| throw newE; |
| } |
| } |
| |
| @Override |
| protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) |
| throws InvalidKeyException, NoSuchAlgorithmException { |
| try { |
| byte[] encoded = engineDoFinal(wrappedKey, 0, wrappedKey.length); |
| if (wrappedKeyType == Cipher.PUBLIC_KEY) { |
| KeyFactory keyFactory = KeyFactory.getInstance(wrappedKeyAlgorithm); |
| return keyFactory.generatePublic(new X509EncodedKeySpec(encoded)); |
| } else if (wrappedKeyType == Cipher.PRIVATE_KEY) { |
| KeyFactory keyFactory = KeyFactory.getInstance(wrappedKeyAlgorithm); |
| return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(encoded)); |
| } else if (wrappedKeyType == Cipher.SECRET_KEY) { |
| return new SecretKeySpec(encoded, wrappedKeyAlgorithm); |
| } else { |
| throw new UnsupportedOperationException("wrappedKeyType == " + wrappedKeyType); |
| } |
| } catch (IllegalBlockSizeException e) { |
| throw new InvalidKeyException(e); |
| } catch (BadPaddingException e) { |
| throw new InvalidKeyException(e); |
| } catch (InvalidKeySpecException e) { |
| throw new InvalidKeyException(e); |
| } |
| } |
| |
| private byte[] checkAndSetEncodedKey(int opmode, Key key) throws InvalidKeyException { |
| if (opmode == Cipher.ENCRYPT_MODE || opmode == Cipher.WRAP_MODE) { |
| encrypting = true; |
| } else if (opmode == Cipher.DECRYPT_MODE || opmode == Cipher.UNWRAP_MODE) { |
| encrypting = false; |
| } else { |
| throw new InvalidParameterException("Unsupported opmode " + opmode); |
| } |
| |
| if (!(key instanceof SecretKey)) { |
| throw new InvalidKeyException("Only SecretKey is supported"); |
| } |
| |
| final byte[] encodedKey = key.getEncoded(); |
| if (encodedKey == null) { |
| throw new InvalidKeyException("key.getEncoded() == null"); |
| } |
| checkSupportedKeySize(encodedKey.length); |
| this.encodedKey = encodedKey; |
| return encodedKey; |
| } |
| |
| protected boolean isEncrypting() { |
| return encrypting; |
| } |
| |
| public static abstract class EVP_CIPHER extends OpenSSLCipher { |
| /** |
| * Native pointer for the OpenSSL EVP_CIPHER context. |
| */ |
| private final EVP_CIPHER_CTX cipherCtx = new EVP_CIPHER_CTX( |
| NativeCrypto.EVP_CIPHER_CTX_new()); |
| |
| /** |
| * Whether the cipher has processed any data yet. EVP_CIPHER doesn't |
| * like calling "doFinal()" in decryption mode without processing any |
| * updates. |
| */ |
| protected boolean calledUpdate; |
| |
| /** |
| * The block size of the current mode. |
| */ |
| private int modeBlockSize; |
| |
| public EVP_CIPHER(Mode mode, Padding padding) { |
| super(mode, padding); |
| } |
| |
| @Override |
| protected void engineInitInternal(byte[] encodedKey, AlgorithmParameterSpec params, |
| SecureRandom random) throws InvalidKeyException, |
| InvalidAlgorithmParameterException { |
| byte[] iv; |
| if (params instanceof IvParameterSpec) { |
| IvParameterSpec ivParams = (IvParameterSpec) params; |
| iv = ivParams.getIV(); |
| } else { |
| iv = null; |
| } |
| |
| final long cipherType = NativeCrypto.EVP_get_cipherbyname(getCipherName( |
| encodedKey.length, mode)); |
| if (cipherType == 0) { |
| throw new InvalidAlgorithmParameterException("Cannot find name for key length = " |
| + (encodedKey.length * 8) + " and mode = " + mode); |
| } |
| |
| final boolean encrypting = isEncrypting(); |
| |
| final int expectedIvLength = NativeCrypto.EVP_CIPHER_iv_length(cipherType); |
| if (iv == null && expectedIvLength != 0) { |
| if (!encrypting) { |
| throw new InvalidAlgorithmParameterException("IV must be specified in " + mode |
| + " mode"); |
| } |
| |
| iv = new byte[expectedIvLength]; |
| if (random == null) { |
| random = new SecureRandom(); |
| } |
| random.nextBytes(iv); |
| } else if (expectedIvLength == 0 && iv != null) { |
| throw new InvalidAlgorithmParameterException("IV not used in " + mode + " mode"); |
| } else if (iv != null && iv.length != expectedIvLength) { |
| throw new InvalidAlgorithmParameterException("expected IV length of " |
| + expectedIvLength + " but was " + iv.length); |
| } |
| |
| this.iv = iv; |
| |
| if (supportsVariableSizeKey()) { |
| NativeCrypto.EVP_CipherInit_ex(cipherCtx, cipherType, null, null, encrypting); |
| NativeCrypto.EVP_CIPHER_CTX_set_key_length(cipherCtx, encodedKey.length); |
| NativeCrypto.EVP_CipherInit_ex(cipherCtx, 0, encodedKey, iv, isEncrypting()); |
| } else { |
| NativeCrypto.EVP_CipherInit_ex(cipherCtx, cipherType, encodedKey, iv, encrypting); |
| } |
| |
| // OpenSSL only supports PKCS5 Padding. |
| NativeCrypto |
| .EVP_CIPHER_CTX_set_padding(cipherCtx, getPadding() == Padding.PKCS5PADDING); |
| modeBlockSize = NativeCrypto.EVP_CIPHER_CTX_block_size(cipherCtx); |
| calledUpdate = false; |
| } |
| |
| @Override |
| protected int updateInternal(byte[] input, int inputOffset, int inputLen, byte[] output, |
| int outputOffset, int maximumLen) throws ShortBufferException { |
| final int intialOutputOffset = outputOffset; |
| |
| final int bytesLeft = output.length - outputOffset; |
| if (bytesLeft < maximumLen) { |
| throw new ShortBufferException("output buffer too small during update: " |
| + bytesLeft + " < " + maximumLen); |
| } |
| |
| outputOffset += NativeCrypto.EVP_CipherUpdate(cipherCtx, output, outputOffset, input, |
| inputOffset, inputLen); |
| |
| calledUpdate = true; |
| |
| return outputOffset - intialOutputOffset; |
| } |
| |
| @Override |
| protected int doFinalInternal(byte[] output, int outputOffset, int maximumLen) |
| throws IllegalBlockSizeException, BadPaddingException, ShortBufferException { |
| /* Remember this so we can tell how many characters were written. */ |
| final int initialOutputOffset = outputOffset; |
| |
| /* |
| * If we're decrypting and haven't had any input, we should return |
| * null. Otherwise OpenSSL will complain if we call final. |
| */ |
| if (!isEncrypting() && !calledUpdate) { |
| return 0; |
| } |
| |
| /* Allow OpenSSL to pad if necessary and clean up state. */ |
| final int bytesLeft = output.length - outputOffset; |
| final int writtenBytes; |
| if (bytesLeft >= maximumLen) { |
| writtenBytes = NativeCrypto.EVP_CipherFinal_ex(cipherCtx, output, outputOffset); |
| } else { |
| final byte[] lastBlock = new byte[maximumLen]; |
| writtenBytes = NativeCrypto.EVP_CipherFinal_ex(cipherCtx, lastBlock, 0); |
| if (writtenBytes > bytesLeft) { |
| throw new ShortBufferException("buffer is too short: " + writtenBytes + " > " |
| + bytesLeft); |
| } else if (writtenBytes > 0) { |
| System.arraycopy(lastBlock, 0, output, outputOffset, writtenBytes); |
| } |
| } |
| outputOffset += writtenBytes; |
| |
| reset(); |
| |
| return outputOffset - initialOutputOffset; |
| } |
| |
| @Override |
| protected int getOutputSizeForFinal(int inputLen) { |
| if (modeBlockSize == 1) { |
| return inputLen; |
| } else { |
| final int buffered = NativeCrypto.get_EVP_CIPHER_CTX_buf_len(cipherCtx); |
| if (getPadding() == Padding.NOPADDING) { |
| return buffered + inputLen; |
| } else { |
| final int totalLen = inputLen + buffered + modeBlockSize; |
| return totalLen - (totalLen % modeBlockSize); |
| } |
| } |
| } |
| |
| @Override |
| protected int getOutputSizeForUpdate(int inputLen) { |
| return getOutputSizeForFinal(inputLen); |
| } |
| |
| /** |
| * Returns the OpenSSL cipher name for the particular {@code keySize} |
| * and cipher {@code mode}. |
| */ |
| protected abstract String getCipherName(int keySize, Mode mode); |
| |
| /** |
| * Reset this Cipher instance state to process a new chunk of data. |
| */ |
| private void reset() { |
| NativeCrypto.EVP_CipherInit_ex(cipherCtx, 0, encodedKey, iv, isEncrypting()); |
| calledUpdate = false; |
| } |
| |
| public static class AES extends EVP_CIPHER { |
| private static final int AES_BLOCK_SIZE = 16; |
| |
| protected AES(Mode mode, Padding padding) { |
| super(mode, padding); |
| } |
| |
| public static class CBC extends AES { |
| public CBC(Padding padding) { |
| super(Mode.CBC, padding); |
| } |
| |
| public static class NoPadding extends CBC { |
| public NoPadding() { |
| super(Padding.NOPADDING); |
| } |
| } |
| |
| public static class PKCS5Padding extends CBC { |
| public PKCS5Padding() { |
| super(Padding.PKCS5PADDING); |
| } |
| } |
| } |
| |
| public static class CTR extends AES { |
| public CTR() { |
| super(Mode.CTR, Padding.NOPADDING); |
| } |
| } |
| |
| public static class ECB extends AES { |
| public ECB(Padding padding) { |
| super(Mode.ECB, padding); |
| } |
| |
| public static class NoPadding extends ECB { |
| public NoPadding() { |
| super(Padding.NOPADDING); |
| } |
| } |
| |
| public static class PKCS5Padding extends ECB { |
| public PKCS5Padding() { |
| super(Padding.PKCS5PADDING); |
| } |
| } |
| } |
| |
| @Override |
| protected void checkSupportedKeySize(int keyLength) throws InvalidKeyException { |
| switch (keyLength) { |
| case 16: // AES 128 |
| case 24: // AES 192 |
| case 32: // AES 256 |
| return; |
| default: |
| throw new InvalidKeyException("Unsupported key size: " + keyLength |
| + " bytes"); |
| } |
| } |
| |
| @Override |
| protected void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException { |
| switch (mode) { |
| case CBC: |
| case CTR: |
| case ECB: |
| return; |
| default: |
| throw new NoSuchAlgorithmException("Unsupported mode " + mode.toString()); |
| } |
| } |
| |
| @Override |
| protected void checkSupportedPadding(Padding padding) throws NoSuchPaddingException { |
| switch (padding) { |
| case NOPADDING: |
| case PKCS5PADDING: |
| return; |
| default: |
| throw new NoSuchPaddingException("Unsupported padding " |
| + padding.toString()); |
| } |
| } |
| |
| @Override |
| protected String getBaseCipherName() { |
| return "AES"; |
| } |
| |
| @Override |
| protected String getCipherName(int keyLength, Mode mode) { |
| return "aes-" + (keyLength * 8) + "-" + mode.toString().toLowerCase(Locale.US); |
| } |
| |
| @Override |
| protected int getCipherBlockSize() { |
| return AES_BLOCK_SIZE; |
| } |
| } |
| |
| public static class DESEDE extends EVP_CIPHER { |
| private static int DES_BLOCK_SIZE = 8; |
| |
| public DESEDE(Mode mode, Padding padding) { |
| super(mode, padding); |
| } |
| |
| public static class CBC extends DESEDE { |
| public CBC(Padding padding) { |
| super(Mode.CBC, padding); |
| } |
| |
| public static class NoPadding extends CBC { |
| public NoPadding() { |
| super(Padding.NOPADDING); |
| } |
| } |
| |
| public static class PKCS5Padding extends CBC { |
| public PKCS5Padding() { |
| super(Padding.PKCS5PADDING); |
| } |
| } |
| } |
| |
| @Override |
| protected String getBaseCipherName() { |
| return "DESede"; |
| } |
| |
| @Override |
| protected String getCipherName(int keySize, Mode mode) { |
| final String baseCipherName; |
| if (keySize == 16) { |
| baseCipherName = "des-ede"; |
| } else { |
| baseCipherName = "des-ede3"; |
| } |
| |
| return baseCipherName + "-" + mode.toString().toLowerCase(Locale.US); |
| } |
| |
| @Override |
| protected void checkSupportedKeySize(int keySize) throws InvalidKeyException { |
| if (keySize != 16 && keySize != 24) { |
| throw new InvalidKeyException("key size must be 128 or 192 bits"); |
| } |
| } |
| |
| @Override |
| protected void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException { |
| if (mode != Mode.CBC) { |
| throw new NoSuchAlgorithmException("Unsupported mode " + mode.toString()); |
| } |
| } |
| |
| @Override |
| protected void checkSupportedPadding(Padding padding) throws NoSuchPaddingException { |
| switch (padding) { |
| case NOPADDING: |
| case PKCS5PADDING: |
| return; |
| default: |
| throw new NoSuchPaddingException("Unsupported padding " |
| + padding.toString()); |
| } |
| } |
| |
| @Override |
| protected int getCipherBlockSize() { |
| return DES_BLOCK_SIZE; |
| } |
| } |
| |
| public static class ARC4 extends EVP_CIPHER { |
| public ARC4() { |
| // Modes and padding don't make sense for ARC4. |
| super(Mode.ECB, Padding.NOPADDING); |
| } |
| |
| @Override |
| protected String getBaseCipherName() { |
| return "ARCFOUR"; |
| } |
| |
| @Override |
| protected String getCipherName(int keySize, Mode mode) { |
| return "rc4"; |
| } |
| |
| @Override |
| protected void checkSupportedKeySize(int keySize) throws InvalidKeyException { |
| } |
| |
| @Override |
| protected void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException { |
| throw new NoSuchAlgorithmException("ARC4 does not support modes"); |
| } |
| |
| @Override |
| protected void checkSupportedPadding(Padding padding) throws NoSuchPaddingException { |
| throw new NoSuchPaddingException("ARC4 does not support padding"); |
| } |
| |
| @Override |
| protected int getCipherBlockSize() { |
| return 0; |
| } |
| |
| @Override |
| protected boolean supportsVariableSizeKey() { |
| return true; |
| } |
| } |
| } |
| } |
