gnu.javax.crypto.kwa
Class BaseKeyWrappingAlgorithm
- IKeyWrappingAlgorithm
A base class to facilitate implementation of concrete Key Wrapping
Algorithms.
protected String | name- The canonical name of the key wrapping algorithm.
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protected abstract void | engineInit(Map<K,V> attributes)
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protected abstract byte[] | engineUnwrap(byte[] in, int inOffset, int length)
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protected abstract byte[] | engineWrap(byte[] in, int inOffset, int length)
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protected PRNG | getDefaultPRNG()
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void | init(Map<K,V> attributes)- Initializes this instance with the designated algorithm specific
attributes.
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String | name()- Returns the canonical name of this Key Wrapping Algorithm.
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byte[] | unwrap(byte[] in, int inOffset, int length)- Unwraps the designated cipher text bytes.
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int | unwrap(byte[] in, int inOffset, int length, byte[] out, int outOffset)- Unwraps the designated cipher text bytes.
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byte[] | wrap(byte[] in, int inOffset, int length)- Wraps the designated plain text bytes.
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int | wrap(byte[] in, int inOffset, int length, byte[] out, int outOffset)- Wraps the designated plain text bytes.
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clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
name
protected String name
The canonical name of the key wrapping algorithm.
engineWrap
protected abstract byte[] engineWrap(byte[] in,
int inOffset,
int length)
getDefaultPRNG
protected PRNG getDefaultPRNG()
- a strong pseudo-random number generator if/when needed.
init
public void init(Map<K,V> attributes)
throws InvalidKeyException Initializes this instance with the designated algorithm specific
attributes.
- init in interface IKeyWrappingAlgorithm
attributes - a map of name-to-value pairs the Key Wrapping Algorithm
must use for its setup.
InvalidKeyException - if an exception is encountered while seting up
the Key Wrapping Algorithm keying material (KEK).
unwrap
public byte[] unwrap(byte[] in,
int inOffset,
int length)
throws KeyUnwrappingException Unwraps the designated cipher text bytes.
- unwrap in interface IKeyWrappingAlgorithm
in - the input byte array containing the cipher text.inOffset - the offset into in where the first byte of
the cipher text (already wrapped key material) to unwrap is
located.length - the number of bytes to unwrap.
- a newly allocated byte array containing the plain text.
KeyUnwrappingException - if after unwrapping the cipher text, the
bytes at the begining did not match the initial value.
unwrap
public int unwrap(byte[] in,
int inOffset,
int length,
byte[] out,
int outOffset)
throws ShortBufferException,
KeyUnwrappingException Unwraps the designated cipher text bytes.
- unwrap in interface IKeyWrappingAlgorithm
in - the input byte array containing the cipher text.inOffset - the offset into in where the first byte of
the cipher text (already wrapped key material) to unwrap is
located.length - the number of bytes to unwrap.out - the output byte array where the unwrapped key material will be
stored.outOffset - the offset into out of the first unwrapped
byte.
- the number of bytes of the unwrapped key material; i.e. the length,
in
out, starting from outOffset
where the plain text (unwrapped key material) are stored.
ShortBufferException - if the output buffer is not long enough to
accomodate the number of bytes resulting from unwrapping the
cipher text.KeyUnwrappingException - if after unwrapping the cipher text, the
bytes at the begining did not match the initial value.
wrap
public byte[] wrap(byte[] in,
int inOffset,
int length) Wraps the designated plain text bytes.
- wrap in interface IKeyWrappingAlgorithm
in - the input byte array containing the plain text.inOffset - the offset into in where the first byte of
the plain text (key material) to wrap is located.length - the number of bytes to wrap.
- a newly allocated byte array containing the cipher text.
wrap
public int wrap(byte[] in,
int inOffset,
int length,
byte[] out,
int outOffset)
throws ShortBufferException Wraps the designated plain text bytes.
- wrap in interface IKeyWrappingAlgorithm
in - the input byte array containing the plain text.inOffset - the offset into in where the first byte of
the plain text (key material) to wrap is located.length - the number of bytes to wrap.out - the output byte array where the wrapped key material will be
stored.outOffset - the offset into out of the first wrapped
byte.
- the number of bytes of the wrapped key material; i.e. the length,
in
out, starting from outOffset
where the cipher text (wrapped key material) are stored.
ShortBufferException - if the output buffer is not long enough to
accomodate the number of bytes resulting from wrapping the plain
text.
BaseKeyWrappingAlgorithm.java -- FIXME: briefly describe file purpose
Copyright (C) 2006 Free Software Foundation, Inc.
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