Class DESKeySpec
java.lang.Object
javax.crypto.spec.DESKeySpec
- All Implemented Interfaces:
KeySpec
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final intThe constant which defines the length of a DES key in bytes. -
Constructor Summary
ConstructorsConstructorDescriptionDESKeySpec(byte[] key) Creates a DESKeySpec object using the first 8 bytes inkeyas the key material for the DES key.DESKeySpec(byte[] key, int offset) Creates a DESKeySpec object using the first 8 bytes inkey, beginning atoffsetinclusive, as the key material for the DES key. -
Method Summary
Modifier and TypeMethodDescriptionbyte[]getKey()Returns the DES key material.static booleanisParityAdjusted(byte[] key, int offset) Checks if the given DES key material, starting atoffsetinclusive, is parity-adjusted.static booleanisWeak(byte[] key, int offset) Checks if the given DES key material is weak or semi-weak.
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Field Details
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DES_KEY_LEN
public static final int DES_KEY_LENThe constant which defines the length of a DES key in bytes.- See Also:
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Constructor Details
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DESKeySpec
Creates a DESKeySpec object using the first 8 bytes inkeyas the key material for the DES key.The bytes that constitute the DES key are those between
key[0]andkey[7]inclusive.- Parameters:
key- the buffer with the DES key material. The first 8 bytes of the buffer are copied to protect against subsequent modification.- Throws:
NullPointerException- if the given key material isnullInvalidKeyException- if the given key material is shorter than 8 bytes.
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DESKeySpec
Creates a DESKeySpec object using the first 8 bytes inkey, beginning atoffsetinclusive, as the key material for the DES key.The bytes that constitute the DES key are those between
key[offset]andkey[offset+7]inclusive.- Parameters:
key- the buffer with the DES key material. The first 8 bytes of the buffer beginning atoffsetinclusive are copied to protect against subsequent modification.offset- the offset inkey, where the DES key material starts.- Throws:
NullPointerException- if the given key material isnullInvalidKeyException- if the given key material, starting atoffsetinclusive, is shorter than 8 bytes.
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Method Details
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getKey
public byte[] getKey()Returns the DES key material.- Returns:
- the DES key material. Returns a new array each time this method is called.
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isParityAdjusted
Checks if the given DES key material, starting atoffsetinclusive, is parity-adjusted.- Parameters:
key- the buffer with the DES key material.offset- the offset inkey, where the DES key material starts.- Returns:
- true if the given DES key material is parity-adjusted, false otherwise.
- Throws:
InvalidKeyException- if the given key material isnull, or starting atoffsetinclusive, is shorter than 8 bytes.
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isWeak
Checks if the given DES key material is weak or semi-weak.- Parameters:
key- the buffer with the DES key material.offset- the offset inkey, where the DES key material starts.- Returns:
- true if the given DES key material is weak or semi-weak, false otherwise.
- Throws:
InvalidKeyException- if the given key material isnull, or starting atoffsetinclusive, is shorter than 8 bytes.
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