下面列出了怎么用javax.crypto.CipherInputStream的API类实例代码及写法，或者点击链接到github查看源代码。
private byte[] rsaDecryptKey(byte[] encrypted) throws KeyStoreException, CertificateException, NoSuchAlgorithmException, IOException, UnrecoverableEntryException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException {
KeyStore keyStore = KeyStore.getInstance(ANDROID_KEY_STORE_NAME);
keyStore.load(null);
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry(KEY_ENCRYPTION, null);
Cipher output = Cipher.getInstance(RSA_MODE, CIPHER_PROVIDER_NAME_ENCRYPTION_DECRYPTION_RSA);
output.init(Cipher.DECRYPT_MODE, privateKeyEntry.getPrivateKey());
CipherInputStream cipherInputStream = new CipherInputStream(
new ByteArrayInputStream(encrypted), output);
ArrayList<Byte> values = new ArrayList<>();
int nextByte;
while ((nextByte = cipherInputStream.read()) != -1) {
values.add((byte) nextByte);
}
byte[] decryptedKeyAsBytes = new byte[values.size()];
for (int i = 0; i < decryptedKeyAsBytes.length; i++) {
decryptedKeyAsBytes[i] = values.get(i);
}
return decryptedKeyAsBytes;
}
@Override
int readByte(CipherInputStream ciIn2, byte[] outputText, int save,
int index) throws IOException {
int len1 = ciIn2.read(outputText, index, save);
out.println("Init: index=" + index + ",len=" + len1);
// read more until save bytes
index += len1;
int len2 = 0;
while (len1 != save && len2 != -1) {
len2 = ciIn2.read(outputText, index, save - len1);
out.println("Cont: index=" + index + ",len=" + len2);
len1 += len2;
index += len2;
}
return index;
}
/**
* Implements byte array buffering type test case of the CICO SKIP test.
*
* @param blockNum block number to read.
*/
private void proceedSkipTestUsingByteArrayBufferingType(
CipherInputStream ciIn2, int blockNum) throws IOException {
int index = blockNum * SAVE;
int len1 = ciIn2.read(outputText, index, SAVE);
// read more until SAVE bytes
index += len1;
int len2 = 0;
int totalRead = len1;
while (len1 != SAVE && len2 != -1) {
len2 = ciIn2.read(outputText, index, SAVE - len1);
len1 += len2;
index += len2;
totalRead += len2;
}
if (totalRead != SAVE) {
throw new RuntimeException("Read bytes number " + totalRead
+ " does not equal to given number " + SAVE);
}
}
/**
* Implements int buffering type test case of the CICO SKIP test.
*
* @param blockNum block number to read.
*/
private void proceedSkipTestUsingIntBufferingType(CipherInputStream ciIn2,
int blockNum) throws IOException {
int index = blockNum * SAVE;
int totalRead = 0;
for (int j = 0; j < SAVE; j++, index++) {
int buffer0 = ciIn2.read();
if (buffer0 != -1) {
outputText[index] = (byte) buffer0;
totalRead++;
} else {
break;
}
}
if (totalRead != SAVE) {
throw new RuntimeException("Read bytes number " + totalRead
+ " does not equal to given number " + SAVE);
}
}
private byte[] rsaDecrypt(byte[] encrypted) throws Exception {
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry(KEY_ALIAS, null);
Cipher output = Cipher.getInstance(RSA_MODE, "AndroidOpenSSL");
output.init(Cipher.DECRYPT_MODE, privateKeyEntry.getPrivateKey());
CipherInputStream cipherInputStream = new CipherInputStream(
new ByteArrayInputStream(encrypted), output);
ArrayList<Byte> values = new ArrayList<>();
int nextByte;
while ((nextByte = cipherInputStream.read()) != -1) {
values.add((byte)nextByte);
}
byte[] bytes = new byte[values.size()];
for(int i = 0; i < bytes.length; i++) {
bytes[i] = values.get(i).byteValue();
}
return bytes;
}
static void cbc_shortStream() throws Exception {
Cipher c;
AlgorithmParameters params;
byte[] read = new byte[200];
System.out.println("Running cbc_shortStream");
// Encrypt 97 byte with AES/CBC/PKCS5Padding
byte[] ct = encryptedText("CBC", 97);
// Create stream with only 96 bytes of encrypted data
CipherInputStream in = getStream("CBC", ct, 96);
try {
int size = in.read(read);
in.close();
if (size != 80) {
throw new RuntimeException("Fail: CipherInputStream.read() " +
"returned " + size + ". Should have been 80");
}
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void gcm_suppressUnreadCorrupt() throws Exception {
Cipher c;
byte[] read = new byte[200];
System.out.println("Running supressUnreadCorrupt test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Corrupt the encrypted message
ct = corruptGCM(ct);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void gcm_oneReadByte() throws Exception {
System.out.println("Running gcm_oneReadByte test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.read();
System.out.println(" Pass.");
} catch (Exception e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void cbc_shortRead400() throws Exception {
System.out.println("Running cbc_shortRead400");
// Encrypt 400 byte with AES/CBC/PKCS5Padding
byte[] ct = encryptedText("CBC", 400);
// Create stream with encrypted data
CipherInputStream in = getStream("CBC", ct);
try {
in.read();
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static CipherInputStream getStream(String mode, byte[] ct, int length)
throws Exception {
Cipher c;
if (mode.compareTo("GCM") == 0) {
c = Cipher.getInstance("AES/GCM/PKCS5Padding", "SunJCE");
c.init(Cipher.DECRYPT_MODE, key, gcmspec);
} else if (mode.compareTo("CBC") == 0) {
c = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
c.init(Cipher.DECRYPT_MODE, key, iv);
} else {
return null;
}
return new CipherInputStream(new ByteArrayInputStream(ct, 0, length), c);
}
static CipherInputStream getStream(String mode, byte[] ct, int length)
throws Exception {
Cipher c;
if (mode.compareTo("GCM") == 0) {
c = Cipher.getInstance("AES/GCM/PKCS5Padding", "SunJCE");
c.init(Cipher.DECRYPT_MODE, key, gcmspec);
} else if (mode.compareTo("CBC") == 0) {
c = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
c.init(Cipher.DECRYPT_MODE, key, iv);
} else {
return null;
}
return new CipherInputStream(new ByteArrayInputStream(ct, 0, length), c);
}
private static String decryptBytes(Key key, byte[] bytes) throws CryptoFailedException {
try {
Cipher cipher = Cipher.getInstance(ENCRYPTION_TRANSFORMATION);
ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
// read the initialization vector from the beginning of the stream
IvParameterSpec ivParams = readIvFromStream(inputStream);
cipher.init(Cipher.DECRYPT_MODE, key, ivParams);
// decrypt the bytes using a CipherInputStream
CipherInputStream cipherInputStream = new CipherInputStream(
inputStream, cipher);
ByteArrayOutputStream output = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
while (true) {
int n = cipherInputStream.read(buffer, 0, buffer.length);
if (n <= 0) {
break;
}
output.write(buffer, 0, n);
}
return new String(output.toByteArray(), DEFAULT_CHARSET);
} catch (IOException | NoSuchAlgorithmException | NoSuchPaddingException |
InvalidKeyException | InvalidAlgorithmParameterException e) {
throw new CryptoFailedException("Could not decrypt bytes", e);
}
}
/**
* Implements byte array buffering type test case of the CICO SKIP test.
*
* @param blockNum block number to read.
*/
private void proceedSkipTestUsingByteArrayBufferingType(
CipherInputStream ciIn2, int blockNum) throws IOException {
int index = blockNum * SAVE;
int len1 = ciIn2.read(outputText, index, SAVE);
// read more until SAVE bytes
index += len1;
int len2 = 0;
int totalRead = len1;
while (len1 != SAVE && len2 != -1) {
len2 = ciIn2.read(outputText, index, SAVE - len1);
len1 += len2;
index += len2;
totalRead += len2;
}
if (totalRead != SAVE) {
throw new RuntimeException("Read bytes number " + totalRead
+ " does not equal to given number " + SAVE);
}
}
/**
* Implements int buffering type test case of the CICO SKIP test.
*
* @param blockNum block number to read.
*/
private void proceedSkipTestUsingIntBufferingType(CipherInputStream ciIn2,
int blockNum) throws IOException {
int index = blockNum * SAVE;
int totalRead = 0;
for (int j = 0; j < SAVE; j++, index++) {
int buffer0 = ciIn2.read();
if (buffer0 != -1) {
outputText[index] = (byte) buffer0;
totalRead++;
} else {
break;
}
}
if (totalRead != SAVE) {
throw new RuntimeException("Read bytes number " + totalRead
+ " does not equal to given number " + SAVE);
}
}
static void gcm_suppressUnreadCorrupt() throws Exception {
Cipher c;
byte[] read = new byte[200];
System.out.println("Running supressUnreadCorrupt test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Corrupt the encrypted message
ct = corruptGCM(ct);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void gcm_oneReadByteCorrupt() throws Exception {
System.out.println("Running gcm_oneReadByteCorrupt test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Corrupt the encrypted message
ct = corruptGCM(ct);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.read();
System.out.println(" Fail. No exception thrown.");
} catch (IOException e) {
Throwable ec = e.getCause();
if (ec instanceof AEADBadTagException) {
System.out.println(" Pass.");
} else {
System.out.println(" Fail: " + ec.getMessage());
throw new RuntimeException(ec);
}
}
}
static void gcm_oneReadByte() throws Exception {
System.out.println("Running gcm_oneReadByte test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.read();
System.out.println(" Pass.");
} catch (Exception e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void cbc_shortRead400() throws Exception {
System.out.println("Running cbc_shortRead400");
// Encrypt 400 byte with AES/CBC/PKCS5Padding
byte[] ct = encryptedText("CBC", 400);
// Create stream with encrypted data
CipherInputStream in = getStream("CBC", ct);
try {
in.read();
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void cbc_shortRead600() throws Exception {
System.out.println("Running cbc_shortRead600");
// Encrypt 600 byte with AES/CBC/PKCS5Padding
byte[] ct = encryptedText("CBC", 600);
// Create stream with encrypted data
CipherInputStream in = getStream("CBC", ct);
try {
in.read();
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static CipherInputStream getStream(String mode, byte[] ct, int length)
throws Exception {
Cipher c;
if (mode.compareTo("GCM") == 0) {
c = Cipher.getInstance("AES/GCM/PKCS5Padding", "SunJCE");
c.init(Cipher.DECRYPT_MODE, key, gcmspec);
} else if (mode.compareTo("CBC") == 0) {
c = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
c.init(Cipher.DECRYPT_MODE, key, iv);
} else {
return null;
}
return new CipherInputStream(new ByteArrayInputStream(ct, 0, length), c);
}
/**
* 解密文件
*
* @param in
*/
public void doDecryptFile(InputStream in, String path) {
if (in == null) {
System.out.println("inputstream is null");
return;
}
try {
CipherInputStream cin = new CipherInputStream(in, mDecryptCipher);
OutputStream outputStream = new FileOutputStream(path);
byte[] bytes = new byte[1024];
int length = -1;
while ((length = cin.read(bytes)) > 0) {
outputStream.write(bytes, 0, length);
outputStream.flush();
}
cin.close();
in.close();
System.out.println("解密成功");
} catch (Exception e) {
System.out.println("解密失败");
e.printStackTrace();
}
}
static void gcm_oneReadByteCorrupt() throws Exception {
System.out.println("Running gcm_oneReadByteCorrupt test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Corrupt the encrypted message
ct = corruptGCM(ct);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.read();
System.out.println(" Fail. No exception thrown.");
} catch (IOException e) {
Throwable ec = e.getCause();
if (ec instanceof AEADBadTagException) {
System.out.println(" Pass.");
} else {
System.out.println(" Fail: " + ec.getMessage());
throw new RuntimeException(ec);
}
}
}
private String decryptBytes(Key key, byte[] bytes) throws CryptoFailedException {
try {
Cipher cipher = Cipher.getInstance(ENCRYPTION_TRANSFORMATION);
ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
// read the initialization vector from the beginning of the stream
IvParameterSpec ivParams = readIvFromStream(inputStream);
cipher.init(Cipher.DECRYPT_MODE, key, ivParams);
// decrypt the bytes using a CipherInputStream
CipherInputStream cipherInputStream = new CipherInputStream(
inputStream, cipher);
ByteArrayOutputStream output = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
while (true) {
int n = cipherInputStream.read(buffer, 0, buffer.length);
if (n <= 0) {
break;
}
output.write(buffer, 0, n);
}
return new String(output.toByteArray(), charsetName);
} catch (Exception e) {
throw new CryptoFailedException("Could not decrypt bytes", e);
}
}
static void gcm_suppressUnreadCorrupt() throws Exception {
Cipher c;
byte[] read = new byte[200];
System.out.println("Running supressUnreadCorrupt test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Corrupt the encrypted message
ct = corruptGCM(ct);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void gcm_oneReadByteCorrupt() throws Exception {
System.out.println("Running gcm_oneReadByteCorrupt test");
// Encrypt 100 bytes with AES/GCM/PKCS5Padding
byte[] ct = encryptedText("GCM", 100);
// Corrupt the encrypted message
ct = corruptGCM(ct);
// Create stream for decryption
CipherInputStream in = getStream("GCM", ct);
try {
in.read();
System.out.println(" Fail. No exception thrown.");
} catch (IOException e) {
Throwable ec = e.getCause();
if (ec instanceof AEADBadTagException) {
System.out.println(" Pass.");
} else {
System.out.println(" Fail: " + ec.getMessage());
throw new RuntimeException(ec);
}
}
}
static void cbc_shortStream() throws Exception {
Cipher c;
AlgorithmParameters params;
byte[] read = new byte[200];
System.out.println("Running cbc_shortStream");
// Encrypt 97 byte with AES/CBC/PKCS5Padding
byte[] ct = encryptedText("CBC", 97);
// Create stream with only 96 bytes of encrypted data
CipherInputStream in = getStream("CBC", ct, 96);
try {
int size = in.read(read);
in.close();
if (size != 80) {
throw new RuntimeException("Fail: CipherInputStream.read() " +
"returned " + size + ". Should have been 80");
}
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void cbc_shortRead400() throws Exception {
System.out.println("Running cbc_shortRead400");
// Encrypt 400 byte with AES/CBC/PKCS5Padding
byte[] ct = encryptedText("CBC", 400);
// Create stream with encrypted data
CipherInputStream in = getStream("CBC", ct);
try {
in.read();
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
static void cbc_shortRead600() throws Exception {
System.out.println("Running cbc_shortRead600");
// Encrypt 600 byte with AES/CBC/PKCS5Padding
byte[] ct = encryptedText("CBC", 600);
// Create stream with encrypted data
CipherInputStream in = getStream("CBC", ct);
try {
in.read();
in.close();
System.out.println(" Pass.");
} catch (IOException e) {
System.out.println(" Fail: " + e.getMessage());
throw new RuntimeException(e.getCause());
}
}
private static byte[] rsaDecrypt(byte[] encrypted) throws Exception {
KeyStore keyStore = KeyStore.getInstance(AndroidKeyStore);
keyStore.load(null);
KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry(KEY_ALIAS, null);
Cipher output = Cipher.getInstance(RSA_MODE);
output.init(Cipher.DECRYPT_MODE, privateKeyEntry.getPrivateKey());
CipherInputStream cipherInputStream = new CipherInputStream(
new ByteArrayInputStream(encrypted), output);
ArrayList<Byte> values = new ArrayList<>();
int nextByte;
while ((nextByte = cipherInputStream.read()) != -1) {
values.add((byte) nextByte);
}
byte[] bytes = new byte[values.size()];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = values.get(i).byteValue();
}
return bytes;
}
/**
* Implements int buffering type test case of the CICO SKIP test.
*
* @param blockNum block number to read.
*/
private void proceedSkipTestUsingIntBufferingType(CipherInputStream ciIn2,
int blockNum) throws IOException {
int index = blockNum * SAVE;
int totalRead = 0;
for (int j = 0; j < SAVE; j++, index++) {
int buffer0 = ciIn2.read();
if (buffer0 != -1) {
outputText[index] = (byte) buffer0;
totalRead++;
} else {
break;
}
}
if (totalRead != SAVE) {
throw new RuntimeException("Read bytes number " + totalRead
+ " does not equal to given number " + SAVE);
}
}