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/*
* 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.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
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.NativeRef.EVP_CIPHER_CTX;
/**
* An implementation of {@link Cipher} using BoringSSL as the backing library.
*
* @hide
*/
@Internal
public abstract class OpenSSLCipher extends CipherSpi {
/**
* Modes that a block cipher may support.
*/
enum Mode {
NONE,
CBC,
CTR,
ECB,
GCM,
POLY1305,
}
/**
* Paddings that a block cipher may support.
*/
enum Padding {
NOPADDING,
PKCS5PADDING,
PKCS7PADDING,
;
public static Padding getNormalized(String value) {
Padding p = Padding.valueOf(value);
if (p == PKCS7PADDING) {
return PKCS5PADDING;
}
return p;
}
}
/**
* The current cipher mode.
*/
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}.
*/
byte[] encodedKey;
/**
* The Initial Vector (IV) used for the current cipher.
*/
byte[] iv;
/**
* Current cipher mode: encrypting or decrypting.
*/
private boolean encrypting;
/**
* The block size of the current cipher.
*/
private int blockSize;
OpenSSLCipher() {
}
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.
*/
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.
*/
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.
*/
abstract int doFinalInternal(byte[] output, int outputOffset, int maximumLen)
throws IllegalBlockSizeException, BadPaddingException, ShortBufferException;
/**
* Returns the standard name for the particular algorithm.
*/
abstract String getBaseCipherName();
/**
* Checks whether the cipher supports this particular {@code keySize} (in
* bytes) and throws {@code InvalidKeyException} if it doesn't.
*/
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.
*/
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.
*/
abstract void checkSupportedPadding(Padding padding) throws NoSuchPaddingException;
abstract int getCipherBlockSize();
boolean supportsVariableSizeKey() {
return false;
}
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.getNormalized(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.
*/
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.
*/
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.
*/
abstract int getOutputSizeForUpdate(int inputLen);
@Override
protected int engineGetOutputSize(int inputLen) {
return Math.max(getOutputSizeForUpdate(inputLen), 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(new IvParameterSpec(iv));
return params;
} catch (NoSuchAlgorithmException e) {
return null;
} catch (InvalidParameterSpecException e) {
return null;
}
}
return null;
}
protected AlgorithmParameterSpec getParameterSpec(AlgorithmParameters params)
throws InvalidAlgorithmParameterException {
if (params != null) {
try {
return params.getParameterSpec(IvParameterSpec.class);
} catch (InvalidParameterSpecException e) {
throw new InvalidAlgorithmParameterException(
"Params must be convertible to IvParameterSpec", e);
}
}
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 = getParameterSpec(params);
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);
}
}
@Override
protected int engineGetKeySize(Key key) throws InvalidKeyException {
if (!(key instanceof SecretKey)) {
throw new InvalidKeyException("Only SecretKey is supported");
}
byte[] encodedKey = key.getEncoded();
if (encodedKey == null) {
throw new InvalidKeyException("key.getEncoded() == null");
}
checkSupportedKeySize(encodedKey.length);
// The return value is in bits
return encodedKey.length * 8;
}
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;
}
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.
*/
boolean calledUpdate;
/**
* The block size of the current mode.
*/
private int modeBlockSize;
public EVP_CIPHER(Mode mode, Padding padding) {
super(mode, padding);
}
@Override
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.nextBytes(iv);
} else {
NativeCrypto.RAND_bytes(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
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
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
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 boolean finalUsed = NativeCrypto.get_EVP_CIPHER_CTX_final_used(cipherCtx);
// There is an additional buffer containing the possible final block.
int totalLen = inputLen + buffered + (finalUsed ? modeBlockSize : 0);
// Extra block for remainder bytes plus padding.
// In case it's encrypting and there are no remainder bytes, add an extra block
// consisting only of padding.
totalLen += ((totalLen % modeBlockSize != 0) || isEncrypting())
? modeBlockSize : 0;
// The minimum multiple of {@code modeBlockSize} that can hold all the bytes.
return totalLen - (totalLen % modeBlockSize);
}
}
}
@Override
int getOutputSizeForUpdate(int inputLen) {
return getOutputSizeForFinal(inputLen);
}
/**
* Returns the OpenSSL cipher name for the particular {@code keySize}
* and cipher {@code mode}.
*/
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;
}
abstract static class AES_BASE extends EVP_CIPHER {
private static final int AES_BLOCK_SIZE = 16;
AES_BASE(Mode mode, Padding padding) {
super(mode, padding);
}
@Override
void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException {
switch (mode) {
case CBC:
case CTR:
case ECB:
return;
default:
throw new NoSuchAlgorithmException("Unsupported mode " + mode.toString());
}
}
@Override
void checkSupportedPadding(Padding padding) throws NoSuchPaddingException {
switch (padding) {
case NOPADDING:
case PKCS5PADDING:
return;
default:
throw new NoSuchPaddingException(
"Unsupported padding " + padding.toString());
}
}
@Override
String getBaseCipherName() {
return "AES";
}
@Override
String getCipherName(int keyLength, Mode mode) {
return "aes-" + (keyLength * 8) + "-" + mode.toString().toLowerCase(Locale.US);
}
@Override
int getCipherBlockSize() {
return AES_BLOCK_SIZE;
}
}
public static class AES extends AES_BASE {
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
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");
}
}
}
public static class AES_128 extends AES_BASE {
AES_128(Mode mode, Padding padding) {
super(mode, padding);
}
public static class CBC extends AES_128 {
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_128 {
public CTR() {
super(Mode.CTR, Padding.NOPADDING);
}
}
public static class ECB extends AES_128 {
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
void checkSupportedKeySize(int keyLength) throws InvalidKeyException {
if (keyLength != 16) { // 128 bits
throw new InvalidKeyException("Unsupported key size: " + keyLength + " bytes");
}
}
}
public static class AES_256 extends AES_BASE {
AES_256(Mode mode, Padding padding) {
super(mode, padding);
}
public static class CBC extends AES_256 {
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_256 {
public CTR() {
super(Mode.CTR, Padding.NOPADDING);
}
}
public static class ECB extends AES_256 {
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
void checkSupportedKeySize(int keyLength) throws InvalidKeyException {
if (keyLength != 32) { // 256 bits
throw new InvalidKeyException("Unsupported key size: " + keyLength + " bytes");
}
}
}
public static class DESEDE extends EVP_CIPHER {
private static final 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
String getBaseCipherName() {
return "DESede";
}
@Override
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
void checkSupportedKeySize(int keySize) throws InvalidKeyException {
if (keySize != 16 && keySize != 24) {
throw new InvalidKeyException("key size must be 128 or 192 bits");
}
}
@Override
void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException {
if (mode != Mode.CBC) {
throw new NoSuchAlgorithmException("Unsupported mode " + mode.toString());
}
}
@Override
void checkSupportedPadding(Padding padding) throws NoSuchPaddingException {
switch (padding) {
case NOPADDING:
case PKCS5PADDING:
return;
default:
throw new NoSuchPaddingException("Unsupported padding "
+ padding.toString());
}
}
@Override
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
String getBaseCipherName() {
return "ARCFOUR";
}
@Override
String getCipherName(int keySize, Mode mode) {
return "rc4";
}
@Override
void checkSupportedKeySize(int keySize) throws InvalidKeyException {
}
@Override
void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException {
if (mode != Mode.NONE && mode != Mode.ECB) {
throw new NoSuchAlgorithmException("Unsupported mode " + mode.toString());
}
}
@Override
void checkSupportedPadding(Padding padding) throws NoSuchPaddingException {
if (padding != Padding.NOPADDING) {
throw new NoSuchPaddingException("Unsupported padding " + padding.toString());
}
}
@Override
int getCipherBlockSize() {
return 0;
}
@Override
boolean supportsVariableSizeKey() {
return true;
}
}
}
public static abstract class EVP_AEAD extends OpenSSLCipher {
/**
* The default tag size when one is not specified. Default to
* full-length tags (128-bits or 16 octets).
*/
private static final int DEFAULT_TAG_SIZE_BITS = 16 * 8;
/**
* Keeps track of the last used block size.
*/
private static int lastGlobalMessageSize = 32;
/**
* The previously used key to prevent key + nonce (IV) reuse.
*/
private byte[] previousKey;
/**
* The previously used nonce (IV) to prevent key + nonce reuse.
*/
private byte[] previousIv;
/**
* When set this instance must be initialized before use again. This prevents key
* and IV reuse.
*/
private boolean mustInitialize;
/**
* The byte array containing the bytes written.
*/
byte[] buf;
/**
* The number of bytes written.
*/
int bufCount;
/**
* AEAD cipher reference.
*/
long evpAead;
/**
* Additional authenticated data.
*/
private byte[] aad;
/**
* The length of the AEAD cipher tag in bytes.
*/
int tagLengthInBytes;
public EVP_AEAD(Mode mode) {
super(mode, Padding.NOPADDING);
}
private void checkInitialization() {
if (mustInitialize) {
throw new IllegalStateException(
"Cannot re-use same key and IV for multiple encryptions");
}
}
/** Constant-time array comparison. Since we are using this to compare keys, we want to
* ensure there's no opportunity for a timing attack. */
private boolean arraysAreEqual(byte[] a, byte[] b) {
if (a.length != b.length) {
return false;
}
int diff = 0;
for (int i = 0; i < a.length; i++) {
diff |= a[i] ^ b[i];
}
return diff == 0;
}
private void expand(int i) {
/* Can the buffer handle i more bytes, if not expand it */
if (bufCount + i <= buf.length) {
return;
}
byte[] newbuf = new byte[(bufCount + i) * 2];
System.arraycopy(buf, 0, newbuf, 0, bufCount);
buf = newbuf;
}
private void reset() {
aad = null;
final int lastBufSize = lastGlobalMessageSize;
if (buf == null) {
buf = new byte[lastBufSize];
} else if (bufCount > 0 && bufCount != lastBufSize) {
lastGlobalMessageSize = bufCount;
if (buf.length != bufCount) {
buf = new byte[bufCount];
}
}
bufCount = 0;
}
@Override
void engineInitInternal(byte[] encodedKey, AlgorithmParameterSpec params,
SecureRandom random) throws InvalidKeyException,
InvalidAlgorithmParameterException {
byte[] iv;
final int tagLenBits;
if (params == null) {
iv = null;
tagLenBits = DEFAULT_TAG_SIZE_BITS;
} else {
GCMParameters gcmParams = Platform.fromGCMParameterSpec(params);
if (gcmParams != null) {
iv = gcmParams.getIV();
tagLenBits = gcmParams.getTLen();
} else if (params instanceof IvParameterSpec) {
IvParameterSpec ivParams = (IvParameterSpec) params;
iv = ivParams.getIV();
tagLenBits = DEFAULT_TAG_SIZE_BITS;
} else {
iv = null;
tagLenBits = DEFAULT_TAG_SIZE_BITS;
}
}
if (tagLenBits % 8 != 0) {
throw new InvalidAlgorithmParameterException(
"Tag length must be a multiple of 8; was " + tagLengthInBytes);
}
tagLengthInBytes = tagLenBits / 8;
final boolean encrypting = isEncrypting();
evpAead = getEVP_AEAD(encodedKey.length);
final int expectedIvLength = NativeCrypto.EVP_AEAD_nonce_length(evpAead);
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.nextBytes(iv);
} else {
NativeCrypto.RAND_bytes(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);
}
if (isEncrypting() && iv != null) {
if (previousKey != null && previousIv != null
&& arraysAreEqual(previousKey, encodedKey)
&& arraysAreEqual(previousIv, iv)) {
mustInitialize = true;
throw new InvalidAlgorithmParameterException(
"When using AEAD key and IV must not be re-used");
}
this.previousKey = encodedKey;
this.previousIv = iv;
}
mustInitialize = false;
this.iv = iv;
reset();
}
@Override
protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output,
int outputOffset) throws ShortBufferException, IllegalBlockSizeException,
BadPaddingException {
// Because the EVP_AEAD updateInternal processes input but doesn't create any output
// (and thus can't check the output buffer), we need to add this check before the
// superclass' processing to ensure that updateInternal is never called if the
// output buffer isn't large enough.
if (output != null) {
if (getOutputSizeForFinal(inputLen) > output.length - outputOffset) {
throw new ShortBufferException("Insufficient output space");
}
}
return super.engineDoFinal(input, inputOffset, inputLen, output, outputOffset);
}
@Override
int updateInternal(byte[] input, int inputOffset, int inputLen, byte[] output,
int outputOffset, int maximumLen) throws ShortBufferException {
checkInitialization();
if (buf == null) {
throw new IllegalStateException("Cipher not initialized");
}
ArrayUtils.checkOffsetAndCount(input.length, inputOffset, inputLen);
if (inputLen > 0) {
expand(inputLen);
System.arraycopy(input, inputOffset, buf, this.bufCount, inputLen);
this.bufCount += inputLen;
}
return 0;
}
@SuppressWarnings("LiteralClassName")
private void throwAEADBadTagExceptionIfAvailable(String message, Throwable cause)
throws BadPaddingException {
Constructor aeadBadTagConstructor;
try {
aeadBadTagConstructor = Class.forName("javax.crypto.AEADBadTagException")
.getConstructor(String.class);
} catch (Exception ignored) {
return;
}
BadPaddingException badTagException = null;
try {
badTagException = (BadPaddingException) aeadBadTagConstructor.newInstance(message);
badTagException.initCause(cause);
} catch (IllegalAccessException e2) {
// Fall through
} catch (InstantiationException e2) {
// Fall through
} catch (InvocationTargetException e2) {
throw(BadPaddingException) new BadPaddingException().initCause(
e2.getTargetException());
}
if (badTagException != null) {
throw badTagException;
}
}
@Override
int doFinalInternal(byte[] output, int outputOffset, int maximumLen)
throws ShortBufferException, IllegalBlockSizeException, BadPaddingException {
checkInitialization();
final int bytesWritten;
try {
if (isEncrypting()) {
bytesWritten = NativeCrypto.EVP_AEAD_CTX_seal(evpAead, encodedKey,
tagLengthInBytes, output, outputOffset, iv, buf, 0, bufCount, aad);
} else {
bytesWritten = NativeCrypto.EVP_AEAD_CTX_open(evpAead, encodedKey,
tagLengthInBytes, output, outputOffset, iv, buf, 0, bufCount, aad);
}
} catch (BadPaddingException e) {
throwAEADBadTagExceptionIfAvailable(e.getMessage(), e.getCause());
throw e;
}
if (isEncrypting()) {
mustInitialize = true;
}
reset();
return bytesWritten;
}
@Override
void checkSupportedPadding(Padding padding) throws NoSuchPaddingException {
if (padding != Padding.NOPADDING) {
throw new NoSuchPaddingException("Must be NoPadding for AEAD ciphers");
}
}
/**
* AEAD buffers everything until a final output.
*/
@Override
int getOutputSizeForUpdate(int inputLen) {
return 0;
}
@Override
int getOutputSizeForFinal(int inputLen) {
return bufCount + inputLen
+ (isEncrypting() ? NativeCrypto.EVP_AEAD_max_overhead(evpAead) : 0);
}
// Intentionally missing Override to compile on old versions of Android
@SuppressWarnings("MissingOverride")
protected void engineUpdateAAD(byte[] input, int inputOffset, int inputLen) {
checkInitialization();
if (aad == null) {
aad = Arrays.copyOfRange(input, inputOffset, inputOffset + inputLen);
} else {
int newSize = aad.length + inputLen;
byte[] newaad = new byte[newSize];
System.arraycopy(aad, 0, newaad, 0, aad.length);
System.arraycopy(input, inputOffset, newaad, aad.length, inputLen);
aad = newaad;
}
}
abstract long getEVP_AEAD(int keyLength) throws InvalidKeyException;
public abstract static class AES extends EVP_AEAD {
private static final int AES_BLOCK_SIZE = 16;
AES(Mode mode) {
super(mode);
}
@Override
void checkSupportedKeySize(int keyLength) throws InvalidKeyException {
switch (keyLength) {
case 16: // AES 128
case 32: // AES 256
return;
default:
throw new InvalidKeyException("Unsupported key size: " + keyLength
+ " bytes (must be 16 or 32)");
}
}
@Override
String getBaseCipherName() {
return "AES";
}
@Override
int getCipherBlockSize() {
return AES_BLOCK_SIZE;
}
public static class GCM extends AES {
public GCM() {
super(Mode.GCM);
}
@Override
void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException {
if (mode != Mode.GCM) {
throw new NoSuchAlgorithmException("Mode must be GCM");
}
}
@Override
protected AlgorithmParameters engineGetParameters() {
// iv will be non-null after initialization.
if (iv == null) {
return null;
}
AlgorithmParameterSpec spec = Platform.toGCMParameterSpec(
tagLengthInBytes * 8, iv);
if (spec == null) {
// The platform doesn't support GCMParameterSpec. Fall back to
// the generic AES parameters so at least the caller can get the
// IV.
return super.engineGetParameters();
}
try {
AlgorithmParameters params = AlgorithmParameters.getInstance("GCM");
params.init(spec);
return params;
} catch (NoSuchAlgorithmException e) {
// We should not get here.
throw (Error) new AssertionError("GCM not supported").initCause(e);
} catch (InvalidParameterSpecException e) {
// This may happen since Conscrypt doesn't provide this itself.
return null;
}
}
@Override
protected AlgorithmParameterSpec getParameterSpec(AlgorithmParameters params)
throws InvalidAlgorithmParameterException {
if (params != null) {
AlgorithmParameterSpec spec = Platform.fromGCMParameters(params);
if (spec != null) {
return spec;
}
return super.getParameterSpec(params);
}
return null;
}
@Override
long getEVP_AEAD(int keyLength) throws InvalidKeyException {
if (keyLength == 16) {
return NativeCrypto.EVP_aead_aes_128_gcm();
} else if (keyLength == 32) {
return NativeCrypto.EVP_aead_aes_256_gcm();
} else {
throw new RuntimeException("Unexpected key length: " + keyLength);
}
}
@Override
int getOutputSizeForFinal(int inputLen) {
// For GCM, the tag is a fixed length and there is no padding or other
// concerns, so we can calculate the exact length required without a
// native call
if (isEncrypting()) {
return bufCount + inputLen + tagLengthInBytes;
} else {
return Math.max(0, bufCount + inputLen - tagLengthInBytes);
}
}
public static class AES_128 extends GCM {
public AES_128() {}
@Override
void checkSupportedKeySize(int keyLength) throws InvalidKeyException {
if (keyLength != 16) { // 128 bits
throw new InvalidKeyException(
"Unsupported key size: " + keyLength + " bytes (must be 16)");
}
}
}
public static class AES_256 extends GCM {
public AES_256() {}
@Override
void checkSupportedKeySize(int keyLength) throws InvalidKeyException {
if (keyLength != 32) { // 256 bits
throw new InvalidKeyException(
"Unsupported key size: " + keyLength + " bytes (must be 32)");
}
}
}
}
}
public static class ChaCha20 extends EVP_AEAD {
public ChaCha20() {
super(Mode.POLY1305);
}
@Override
void checkSupportedKeySize(int keyLength) throws InvalidKeyException {
if (keyLength != 32) {
throw new InvalidKeyException("Unsupported key size: " + keyLength
+ " bytes (must be 32)");
}
}
@Override
String getBaseCipherName() {
return "ChaCha20";
}
@Override
int getCipherBlockSize() {
return 0;
}
@Override
void checkSupportedMode(Mode mode) throws NoSuchAlgorithmException {
if (mode != Mode.POLY1305) {
throw new NoSuchAlgorithmException("Mode must be Poly1305");
}
}
@Override
long getEVP_AEAD(int keyLength) throws InvalidKeyException {
if (keyLength == 32) {
return NativeCrypto.EVP_aead_chacha20_poly1305();
} else {
throw new RuntimeException("Unexpected key length: " + keyLength);
}
}
@Override
int getOutputSizeForFinal(int inputLen) {
// For ChaCha20+Poly1305, the tag is always 16 bytes long and there is no
// padding or other concerns, so we can calculate the exact length required
// without a native call
if (isEncrypting()) {
return bufCount + inputLen + 16;
} else {
return Math.max(0, bufCount + inputLen - 16);
}
}
}
}
}
