paddedbufferedblockcipher.html

java非对称加密的源代码

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<A NAME="PaddedBufferedBlockCipher(org.bouncycastle.crypto.BlockCipher, org.bouncycastle.crypto.paddings.BlockCipherPadding)"><!-- --></A><H3>
PaddedBufferedBlockCipher</H3>
<PRE>
public <B>PaddedBufferedBlockCipher</B>(<A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A>&nbsp;cipher,
                                 <A HREF="../../../../org/bouncycastle/crypto/paddings/BlockCipherPadding.html" title="interface in org.bouncycastle.crypto.paddings">BlockCipherPadding</A>&nbsp;padding)</PRE>
<DL>
<DD>Create a buffered block cipher with the desired padding.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>cipher</CODE> - the underlying block cipher this buffering object wraps.<DD><CODE>padding</CODE> - the padding type.</DL>
</DL>
<HR>

<A NAME="PaddedBufferedBlockCipher(org.bouncycastle.crypto.BlockCipher)"><!-- --></A><H3>
PaddedBufferedBlockCipher</H3>
<PRE>
public <B>PaddedBufferedBlockCipher</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 PKCS7 padding
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>cipher</CODE> - the underlying block cipher this buffering object wraps.</DL>
</DL>

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<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>Overrides:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html#init(boolean, org.bouncycastle.crypto.CipherParameters)">init</A></CODE> in class <CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html" title="class in org.bouncycastle.crypto">BufferedBlockCipher</A></CODE></DL>
</DD>
<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="getOutputSize(int)"><!-- --></A><H3>
getOutputSize</H3>
<PRE>
public int <B>getOutputSize</B>(int&nbsp;len)</PRE>
<DL>
<DD>return the minimum size of the output buffer required for an update
 plus a doFinal with an input of len bytes.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html#getOutputSize(int)">getOutputSize</A></CODE> in class <CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html" title="class in org.bouncycastle.crypto">BufferedBlockCipher</A></CODE></DL>
</DD>
<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="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>Overrides:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html#getUpdateOutputSize(int)">getUpdateOutputSize</A></CODE> in class <CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html" title="class in org.bouncycastle.crypto">BufferedBlockCipher</A></CODE></DL>
</DD>
<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="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>Overrides:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html#processByte(byte, byte[], int)">processByte</A></CODE> in class <CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html" title="class in org.bouncycastle.crypto">BufferedBlockCipher</A></CODE></DL>
</DD>
<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>Overrides:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html#processBytes(byte[], int, int, byte[], int)">processBytes</A></CODE> in class <CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html" title="class in org.bouncycastle.crypto">BufferedBlockCipher</A></CODE></DL>
</DD>
<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. If the buffer is currently
 full and padding needs to be added a call to doFinal will produce
 2 * getBlockSize() bytes.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html#doFinal(byte[], int)">doFinal</A></CODE> in class <CODE><A HREF="../../../../org/bouncycastle/crypto/BufferedBlockCipher.html" title="class in org.bouncycastle.crypto">BufferedBlockCipher</A></CODE></DL>
</DD>
<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 we are decrypting and the input is not block size aligned.
<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.</DL>
</DD>
</DL>
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