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java.lang.Object | +--javax.crypto.CipherSpi | +--com.ibm.crypto.provider.PBEWithSHA1AndDESCipher
This class represents password-based encryption as defined by the PKCS #5 standard. The particular algorithm implemented is pbeWithSHA1AndDES-CBC. Padding is done as described in PKCS #5.
Cipher
Field Summary | |
protected DESCipher |
desCipher
|
protected int |
iCount
|
protected byte[] |
salt
|
Constructor Summary | |
PBEWithSHA1AndDESCipher()
Creates an instance of this cipher, and initializes its mode (CBC) and padding (PKCS5). |
Method Summary | |
protected byte[] |
engineDoFinal(byte[] input,
int inputOffset,
int inputLen)
Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. |
protected int |
engineDoFinal(byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. |
protected int |
engineGetBlockSize()
Returns the block size (in bytes). |
protected byte[] |
engineGetIV()
Returns the initialization vector (IV) in a new buffer. |
protected int |
engineGetKeySize(Key key)
Returns the key size of the given key object. |
protected int |
engineGetOutputSize(int inputLen)
Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update or
doFinal operation, given the input length
inputLen (in bytes). |
protected AlgorithmParameters |
engineGetParameters()
Returns the parameters used with this cipher. |
protected void |
engineInit(int opmode,
Key key,
AlgorithmParameterSpec params,
SecureRandom random)
Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness. |
protected void |
engineInit(int opmode,
Key key,
AlgorithmParameters params,
SecureRandom random)
Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness. |
protected void |
engineInit(int opmode,
Key key,
SecureRandom random)
Initializes this cipher with a key and a source of randomness. |
protected void |
engineSetMode(String mode)
Sets the mode of this cipher. |
protected void |
engineSetPadding(String paddingScheme)
Sets the padding mechanism of this cipher. |
protected Key |
engineUnwrap(byte[] wrappedKey,
String wrappedKeyAlgorithm,
int wrappedKeyType)
Unwrap a previously wrapped key. |
protected byte[] |
engineUpdate(byte[] input,
int inputOffset,
int inputLen)
Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part. |
protected int |
engineUpdate(byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part. |
protected byte[] |
engineWrap(Key key)
Wrap a key. |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Field Detail |
protected DESCipher desCipher
protected byte[] salt
protected int iCount
Constructor Detail |
public PBEWithSHA1AndDESCipher() throws NoSuchAlgorithmException, NoSuchPaddingException
Method Detail |
protected void engineSetMode(String mode) throws NoSuchAlgorithmException
mode
- the cipher modeprotected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException
padding
- the padding mechanismprotected int engineGetBlockSize()
protected int engineGetOutputSize(int inputLen)
update
or
doFinal
operation, given the input length
inputLen
(in bytes).
This call takes into account any unprocessed (buffered) data from a
previous update
call, and padding.
The actual output length of the next update
or
doFinal
call may be smaller than the length returned by
this method.
inputLen
- the input length (in bytes)protected byte[] engineGetIV()
This is useful in the case where a random IV has been created (see init), or in the context of password-based encryption or decryption, where the IV is derived from a user-supplied password.
protected AlgorithmParameters engineGetParameters()
The returned parameters may be the same that were used to initialize this cipher, or may contain the default set of parameters or a set of randomly generated parameters used by the underlying cipher implementation (provided that the underlying cipher implementation uses a default set of parameters or creates new parameters if it needs parameters but was not initialized with any).
protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException
opmode
.
If this cipher (including its underlying feedback or padding scheme)
requires any random bytes, it will get them from random
.
opmode
- the operation mode of this cipher (this is one of
the following:
ENCRYPT_MODE
, DECRYPT_MODE
),
WRAP_MODE
or UNWRAP_MODE
)key
- the encryption keyrandom
- the source of randomnessprotected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException
opmode
.
If this cipher (including its underlying feedback or padding scheme)
requires any random bytes, it will get them from random
.
opmode
- the operation mode of this cipher (this is one of
the following:
ENCRYPT_MODE
, DECRYPT_MODE
),
WRAP_MODE
or UNWRAP_MODE
)key
- the encryption keyparams
- the algorithm parametersrandom
- the source of randomnessprotected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException
The cipher is initialized for one of the following four operations:
encryption, decryption, key wrapping or key unwrapping, depending on
the value of opmode
.
If this cipher requires any algorithm parameters and
params
is null, the underlying cipher implementation is
supposed to generate the required parameters itself (using
provider-specific default or random values) if it is being
initialized for encryption or key wrapping, and raise an
InvalidAlgorithmParameterException
if it is being
initialized for decryption or key unwrapping.
The generated parameters can be retrieved using
engineGetParameters or
engineGetIV (if the parameter is an IV).
If this cipher (including its underlying feedback or padding scheme)
requires any random bytes (e.g., for parameter generation), it will get
them from random
.
Note that when a Cipher object is initialized, it loses all previously-acquired state. In other words, initializing a Cipher is equivalent to creating a new instance of that Cipher and initializing it.
opmode
- the operation mode of this cipher (this is one of
the following:
ENCRYPT_MODE
, DECRYPT_MODE
,
WRAP_MODE
or UNWRAP_MODE
)key
- the encryption keyparams
- the algorithm parametersrandom
- the source of randomnessparams
is null.protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen)
The first inputLen
bytes in the input
buffer, starting at inputOffset
, are processed, and the
result is stored in a new buffer.
input
- the input bufferinputOffset
- the offset in input
where the input
startsinputLen
- the input lengthprotected int engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws ShortBufferException
The first inputLen
bytes in the input
buffer, starting at inputOffset
, are processed, and the
result is stored in the output
buffer, starting at
outputOffset
.
input
- the input bufferinputOffset
- the offset in input
where the input
startsinputLen
- the input lengthoutput
- the buffer for the resultoutputOffset
- the offset in output
where the result
is storedoutput
protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen) throws IllegalBlockSizeException, BadPaddingException
The first inputLen
bytes in the input
buffer, starting at inputOffset
, and any input bytes that
may have been buffered during a previous update
operation,
are processed, with padding (if requested) being applied.
The result is stored in a new buffer.
The cipher is reset to its initial state (uninitialized) after this call.
input
- the input bufferinputOffset
- the offset in input
where the input
startsinputLen
- the input lengthprotected int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws ShortBufferException, IllegalBlockSizeException, BadPaddingException
The first inputLen
bytes in the input
buffer, starting at inputOffset
, and any input bytes that
may have been buffered during a previous update
operation,
are processed, with padding (if requested) being applied.
The result is stored in the output
buffer, starting at
outputOffset
.
The cipher is reset to its initial state (uninitialized) after this call.
input
- the input bufferinputOffset
- the offset in input
where the input
startsinputLen
- the input lengthoutput
- the buffer for the resultoutputOffset
- the offset in output
where the result
is storedoutput
protected int engineGetKeySize(Key key) throws InvalidKeyException
key
- the key object.key<.code> is invalid.
protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException
key
- the key to be wrapped.protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException
wrappedKey
- the key to be unwrapped.wrappedKeyAlgorithm
- the algorithm the wrapped key is for.wrappedKeyType
- the type of the wrapped key.
This is one of Cipher.SECRET_KEY
,
Cipher.PRIVATE_KEY
, or Cipher.PUBLIC_KEY
.wrappedKey
does not
represent a wrapped key, or if the algorithm associated with the
wrapped key is different from wrappedKeyAlgorithm
and/or its key type is different from wrappedKeyType
.wrappedKeyAlgorithm
.
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