bufferedblockcipher.html

java非对称加密的源代码

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<A NAME="bufOff"><!-- --></A><H3>
bufOff</H3>
<PRE>
protected int <B>bufOff</B></PRE>
<DL>
<DL>
</DL>
</DL>
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<A NAME="forEncryption"><!-- --></A><H3>
forEncryption</H3>
<PRE>
protected boolean <B>forEncryption</B></PRE>
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<DL>
</DL>
</DL>
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<A NAME="cipher"><!-- --></A><H3>
cipher</H3>
<PRE>
protected <A HREF="../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A> <B>cipher</B></PRE>
<DL>
<DL>
</DL>
</DL>
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<A NAME="partialBlockOkay"><!-- --></A><H3>
partialBlockOkay</H3>
<PRE>
protected boolean <B>partialBlockOkay</B></PRE>
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<DL>
</DL>
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<A NAME="pgpCFB"><!-- --></A><H3>
pgpCFB</H3>
<PRE>
protected boolean <B>pgpCFB</B></PRE>
<DL>
<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<A NAME="BufferedBlockCipher()"><!-- --></A><H3>
BufferedBlockCipher</H3>
<PRE>
protected <B>BufferedBlockCipher</B>()</PRE>
<DL>
<DD>constructor for subclasses
<P>
</DL>
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<A NAME="BufferedBlockCipher(org.bouncycastle.crypto.BlockCipher)"><!-- --></A><H3>
BufferedBlockCipher</H3>
<PRE>
public <B>BufferedBlockCipher</B>(<A HREF="../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A>&nbsp;cipher)</PRE>
<DL>
<DD>Create a buffered block cipher without padding.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>cipher</CODE> - the underlying block cipher this buffering object wraps.</DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="getUnderlyingCipher()"><!-- --></A><H3>
getUnderlyingCipher</H3>
<PRE>
public <A HREF="../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A> <B>getUnderlyingCipher</B>()</PRE>
<DL>
<DD>return the cipher this object wraps.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the cipher this object wraps.</DL>
</DD>
</DL>
<HR>

<A NAME="init(boolean, org.bouncycastle.crypto.CipherParameters)"><!-- --></A><H3>
init</H3>
<PRE>
public void <B>init</B>(boolean&nbsp;forEncryption,
                 <A HREF="../../../org/bouncycastle/crypto/CipherParameters.html" title="interface in org.bouncycastle.crypto">CipherParameters</A>&nbsp;params)
          throws java.lang.IllegalArgumentException</PRE>
<DL>
<DD>initialise the cipher.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>forEncryption</CODE> - if true the cipher is initialised for
  encryption, if false for decryption.<DD><CODE>params</CODE> - the key and other data required by the cipher.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if the params argument is
 inappropriate.</DL>
</DD>
</DL>
<HR>

<A NAME="getBlockSize()"><!-- --></A><H3>
getBlockSize</H3>
<PRE>
public int <B>getBlockSize</B>()</PRE>
<DL>
<DD>return the blocksize for the underlying cipher.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the blocksize for the underlying cipher.</DL>
</DD>
</DL>
<HR>

<A NAME="getUpdateOutputSize(int)"><!-- --></A><H3>
getUpdateOutputSize</H3>
<PRE>
public int <B>getUpdateOutputSize</B>(int&nbsp;len)</PRE>
<DL>
<DD>return the size of the output buffer required for an update 
 an input of len bytes.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>len</CODE> - the length of the input.
<DT><B>Returns:</B><DD>the space required to accommodate a call to update
 with len bytes of input.</DL>
</DD>
</DL>
<HR>

<A NAME="getOutputSize(int)"><!-- --></A><H3>
getOutputSize</H3>
<PRE>
public int <B>getOutputSize</B>(int&nbsp;len)</PRE>
<DL>
<DD>return the size of the output buffer required for an update plus a
 doFinal with an input of len bytes.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>len</CODE> - the length of the input.
<DT><B>Returns:</B><DD>the space required to accommodate a call to update and doFinal
 with len bytes of input.</DL>
</DD>
</DL>
<HR>

<A NAME="processByte(byte, byte[], int)"><!-- --></A><H3>
processByte</H3>
<PRE>
public int <B>processByte</B>(byte&nbsp;in,
                       byte[]&nbsp;out,
                       int&nbsp;outOff)
                throws <A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A>,
                       java.lang.IllegalStateException</PRE>
<DL>
<DD>process a single byte, producing an output block if neccessary.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the input byte.<DD><CODE>out</CODE> - the space for any output that might be produced.<DD><CODE>outOff</CODE> - the offset from which the output will be copied.
<DT><B>Returns:</B><DD>the number of output bytes copied to out.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A></CODE> - if there isn't enough space in out.
<DD><CODE>java.lang.IllegalStateException</CODE> - if the cipher isn't initialised.</DL>
</DD>
</DL>
<HR>

<A NAME="processBytes(byte[], int, int, byte[], int)"><!-- --></A><H3>
processBytes</H3>
<PRE>
public int <B>processBytes</B>(byte[]&nbsp;in,
                        int&nbsp;inOff,
                        int&nbsp;len,
                        byte[]&nbsp;out,
                        int&nbsp;outOff)
                 throws <A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A>,
                        java.lang.IllegalStateException</PRE>
<DL>
<DD>process an array of bytes, producing output if necessary.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the input byte array.<DD><CODE>inOff</CODE> - the offset at which the input data starts.<DD><CODE>len</CODE> - the number of bytes to be copied out of the input array.<DD><CODE>out</CODE> - the space for any output that might be produced.<DD><CODE>outOff</CODE> - the offset from which the output will be copied.
<DT><B>Returns:</B><DD>the number of output bytes copied to out.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A></CODE> - if there isn't enough space in out.
<DD><CODE>java.lang.IllegalStateException</CODE> - if the cipher isn't initialised.</DL>
</DD>
</DL>
<HR>

<A NAME="doFinal(byte[], int)"><!-- --></A><H3>
doFinal</H3>
<PRE>
public int <B>doFinal</B>(byte[]&nbsp;out,
                   int&nbsp;outOff)
            throws <A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A>,
                   java.lang.IllegalStateException,
                   <A HREF="../../../org/bouncycastle/crypto/InvalidCipherTextException.html" title="class in org.bouncycastle.crypto">InvalidCipherTextException</A></PRE>
<DL>
<DD>Process the last block in the buffer.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>out</CODE> - the array the block currently being held is copied into.<DD><CODE>outOff</CODE> - the offset at which the copying starts.
<DT><B>Returns:</B><DD>the number of output bytes copied to out.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A></CODE> - if there is insufficient space in out for
 the output, or the input is not block size aligned and should be.
<DD><CODE>java.lang.IllegalStateException</CODE> - if the underlying cipher is not
 initialised.
<DD><CODE><A HREF="../../../org/bouncycastle/crypto/InvalidCipherTextException.html" title="class in org.bouncycastle.crypto">InvalidCipherTextException</A></CODE> - if padding is expected and not found.
<DD><CODE><A HREF="../../../org/bouncycastle/crypto/DataLengthException.html" title="class in org.bouncycastle.crypto">DataLengthException</A></CODE> - if the input is not block size
 aligned.</DL>
</DD>
</DL>
<HR>

<A NAME="reset()"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>()</PRE>
<DL>
<DD>Reset the buffer and cipher. After resetting the object is in the same
 state as it was after the last init (if there was one).
<P>
<DD><DL>
</DL>
</DD>
</DL>
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