java.lang.Object | ||
↳ | org.bouncycastle.crypto.BufferedBlockCipher | |
↳ | org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher |
A wrapper class that allows block ciphers to be used to process data in a piecemeal fashion with padding. The PaddedBufferedBlockCipher outputs a block only when the buffer is full and more data is being added, or on a doFinal (unless the current block in the buffer is a pad block). The default padding mechanism used is the one outlined in PKCS5/PKCS7.
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Inherited Fields | |||||||||||
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From class
org.bouncycastle.crypto.BufferedBlockCipher
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Public Constructors | |||||||||||
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Create a buffered block cipher with the desired padding.
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Create a buffered block cipher PKCS7 padding
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Public Methods | |||||||||||
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Process the last block in the buffer.
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return the minimum size of the output buffer required for an update
plus a doFinal with an input of len bytes.
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return the size of the output buffer required for an update
an input of len bytes.
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initialise the cipher.
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process a single byte, producing an output block if neccessary.
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process an array of bytes, producing output if necessary.
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Inherited Methods | |||||||||||
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From class
org.bouncycastle.crypto.BufferedBlockCipher
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From class
java.lang.Object
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Create a buffered block cipher with the desired padding.
cipher | the underlying block cipher this buffering object wraps. |
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padding | the padding type. |
Create a buffered block cipher PKCS7 padding
cipher | the underlying block cipher this buffering object wraps. |
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Process the last block in the buffer. If the buffer is currently full and padding needs to be added a call to doFinal will produce 2 * getBlockSize() bytes.
out | the array the block currently being held is copied into. |
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outOff | the offset at which the copying starts. |
DataLengthException | if there is insufficient space in out for the output or we are decrypting and the input is not block size aligned. |
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IllegalStateException | if the underlying cipher is not initialised. |
InvalidCipherTextException | if padding is expected and not found. |
return the minimum size of the output buffer required for an update plus a doFinal with an input of len bytes.
len | the length of the input. |
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return the size of the output buffer required for an update an input of len bytes.
len | the length of the input. |
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initialise the cipher.
forEncryption | if true the cipher is initialised for encryption, if false for decryption. |
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params | the key and other data required by the cipher. |
IllegalArgumentException | if the params argument is inappropriate. |
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process a single byte, producing an output block if neccessary.
in | the input byte. |
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out | the space for any output that might be produced. |
outOff | the offset from which the output will be copied. |
DataLengthException | if there isn't enough space in out. |
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IllegalStateException | if the cipher isn't initialised. |
process an array of bytes, producing output if necessary.
in | the input byte array. |
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inOff | the offset at which the input data starts. |
len | the number of bytes to be copied out of the input array. |
out | the space for any output that might be produced. |
outOff | the offset from which the output will be copied. |
DataLengthException | if there isn't enough space in out. |
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IllegalStateException | if the cipher isn't initialised. |