com.aliyun.oss.crypto

Class CryptoScheme

java.lang.Object

com.aliyun.oss.crypto.CryptoScheme

Direct Known Subclasses:

AesCtr

public abstract class CryptoScheme
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static CryptoScheme	AES_CTR
static int	BLOCK_SIZE

Constructor Summary

Constructors

Constructor and Description
CryptoScheme()

Method Summary

Methods

Modifier and Type	Method and Description
abstract byte[]	adjustIV(byte[] iv, long dataStartPos)
CryptoCipher	createCryptoCipher(SecretKey cek, byte[] iv, int cipherMode, Provider provider)
static CryptoScheme	fromCEKAlgo(String cekAlgo)
abstract String	getContentChiperAlgorithm()
abstract int	getContentChiperIVLength()
abstract String	getKeyGeneratorAlgorithm()
abstract int	getKeyLengthInBits()
static byte[]	incrementBlocks(byte[] counter, long blockDelta) Increment the rightmost 64 bits of a 16-byte counter by the specified delta.
CryptoCipher	newCryptoCipher(Cipher cipher, SecretKey cek, int cipherMode) This is a factory method to create CryptoCipher.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BLOCK_SIZE

public static final int BLOCK_SIZE

See Also:

Constant Field Values

AES_CTR

public static final CryptoScheme AES_CTR

Constructor Detail

CryptoScheme

public CryptoScheme()

Method Detail

getKeyGeneratorAlgorithm

public abstract String getKeyGeneratorAlgorithm()

getKeyLengthInBits

public abstract int getKeyLengthInBits()

getContentChiperAlgorithm

public abstract String getContentChiperAlgorithm()

getContentChiperIVLength

public abstract int getContentChiperIVLength()

adjustIV

public abstract byte[] adjustIV(byte[] iv,
              long dataStartPos)

newCryptoCipher

public CryptoCipher newCryptoCipher(Cipher cipher,
                           SecretKey cek,
                           int cipherMode)

This is a factory method to create CryptoCipher.

createCryptoCipher

public CryptoCipher createCryptoCipher(SecretKey cek,
                              byte[] iv,
                              int cipherMode,
                              Provider provider)

incrementBlocks

public static byte[] incrementBlocks(byte[] counter,
                     long blockDelta)

Increment the rightmost 64 bits of a 16-byte counter by the specified delta. Both the specified delta and the resultant value must stay within the capacity of 64 bits. (Package private for testing purposes.)

Parameters:

counter - a 16-byte counter.

blockDelta - the number of blocks (16-byte) to increment

fromCEKAlgo

public static CryptoScheme fromCEKAlgo(String cekAlgo)