ofbblockcipher.html

java非对称加密的源代码

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<A NAME="OFBBlockCipher(org.bouncycastle.crypto.BlockCipher, int)"><!-- --></A><H3>
OFBBlockCipher</H3>
<PRE>
public <B>OFBBlockCipher</B>(<A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A>&nbsp;cipher,
                      int&nbsp;blockSize)</PRE>
<DL>
<DD>Basic constructor.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>cipher</CODE> - the block cipher to be used as the basis of the
 feedback mode.<DD><CODE>blockSize</CODE> - the block size in bits (note: a multiple of 8)</DL>
</DL>

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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 underlying block cipher that we are wrapping.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the underlying block cipher that we are wrapping.</DL>
</DD>
</DL>
<HR>

<A NAME="init(boolean, org.bouncycastle.crypto.CipherParameters)"><!-- --></A><H3>
init</H3>
<PRE>
public void <B>init</B>(boolean&nbsp;encrypting,
                 <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 and, possibly, the initialisation vector (IV).
 If an IV isn't passed as part of the parameter, the IV will be all zeros.
 An IV which is too short is handled in FIPS compliant fashion.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html#init(boolean, org.bouncycastle.crypto.CipherParameters)">init</A></CODE> in interface <CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>encrypting</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="getAlgorithmName()"><!-- --></A><H3>
getAlgorithmName</H3>
<PRE>
public java.lang.String <B>getAlgorithmName</B>()</PRE>
<DL>
<DD>return the algorithm name and mode.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html#getAlgorithmName()">getAlgorithmName</A></CODE> in interface <CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the name of the underlying algorithm followed by "/OFB"
 and the block size in bits</DL>
</DD>
</DL>
<HR>

<A NAME="getBlockSize()"><!-- --></A><H3>
getBlockSize</H3>
<PRE>
public int <B>getBlockSize</B>()</PRE>
<DL>
<DD>return the block size we are operating at (in bytes).
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html#getBlockSize()">getBlockSize</A></CODE> in interface <CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the block size we are operating at (in bytes).</DL>
</DD>
</DL>
<HR>

<A NAME="processBlock(byte[], int, byte[], int)"><!-- --></A><H3>
processBlock</H3>
<PRE>
public int <B>processBlock</B>(byte[]&nbsp;in,
                        int&nbsp;inOff,
                        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 one block of input from the array in and write it to
 the out array.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html#processBlock(byte[], int, byte[], int)">processBlock</A></CODE> in interface <CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the array containing the input data.<DD><CODE>inOff</CODE> - offset into the in array the data starts at.<DD><CODE>out</CODE> - the array the output data will be copied into.<DD><CODE>outOff</CODE> - the offset into the out array the output will start at.
<DT><B>Returns:</B><DD>the number of bytes processed and produced.
<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 data in in, or
 space in out.
<DD><CODE>java.lang.IllegalStateException</CODE> - if the cipher isn't initialised.</DL>
</DD>
</DL>
<HR>

<A NAME="reset()"><!-- --></A><H3>
reset</H3>
<PRE>
public void <B>reset</B>()</PRE>
<DL>
<DD>reset the feedback vector back to the IV and reset the underlying
 cipher.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html#reset()">reset</A></CODE> in interface <CODE><A HREF="../../../../org/bouncycastle/crypto/BlockCipher.html" title="interface in org.bouncycastle.crypto">BlockCipher</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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