randomdata.html

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<A NAME="ALG_PSEUDO_RANDOM"><!-- --></A><H3>
ALG_PSEUDO_RANDOM</H3>
<PRE>
public static final byte <B>ALG_PSEUDO_RANDOM</B></PRE>
<DL>
<DD>Utility pseudo-random number generation algorithms. The random number sequence
 generated by this algorithm need not be the same even if seeded with the same
 seed data.
 <p> Even if a transaction is in progress, the update of the internal state
 shall not participate in the transaction.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#javacard.security.RandomData.ALG_PSEUDO_RANDOM">Constant Field Values</A></DL>
</DL>
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<A NAME="ALG_SECURE_RANDOM"><!-- --></A><H3>
ALG_SECURE_RANDOM</H3>
<PRE>
public static final byte <B>ALG_SECURE_RANDOM</B></PRE>
<DL>
<DD>Cryptographically secure random number generation algorithms.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#javacard.security.RandomData.ALG_SECURE_RANDOM">Constant Field Values</A></DL>
</DL>

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<A NAME="RandomData()"><!-- --></A><H3>
RandomData</H3>
<PRE>
protected <B>RandomData</B>()</PRE>
<DL>
<DD>Protected constructor for subclassing.
<P>
</DL>

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<A NAME="getInstance(byte)"><!-- --></A><H3>
getInstance</H3>
<PRE>
public static final <A HREF="../../javacard/security/RandomData.html" title="class in javacard.security">RandomData</A> <B>getInstance</B>(byte&nbsp;algorithm)
                                    throws <A HREF="../../javacard/security/CryptoException.html" title="class in javacard.security">CryptoException</A></PRE>
<DL>
<DD>Creates a <code>RandomData</code> instance of the selected algorithm.
 The pseudo random <code>RandomData</code> instance's seed is initialized to a internal default value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>algorithm</CODE> - the desired random number algorithm. Valid codes listed in <code>ALG_*</code> constants above. See <A HREF="../../javacard/security/RandomData.html#ALG_PSEUDO_RANDOM"><CODE>ALG_PSEUDO_RANDOM</CODE></A>.
<DT><B>Returns:</B><DD>the <code>RandomData</code> object instance of the requested algorithm
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javacard/security/CryptoException.html" title="class in javacard.security">CryptoException</A></CODE> - with the following reason codes:<ul>
 <li><code>CryptoException.NO_SUCH_ALGORITHM</code> if the requested algorithm is not supported.</ul></DL>
</DD>
</DL>
<HR>

<A NAME="generateData(byte[], short, short)"><!-- --></A><H3>
generateData</H3>
<PRE>
public abstract void <B>generateData</B>(byte[]&nbsp;buffer,
                                  short&nbsp;offset,
                                  short&nbsp;length)
                           throws <A HREF="../../javacard/security/CryptoException.html" title="class in javacard.security">CryptoException</A></PRE>
<DL>
<DD>Generates random data.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>buffer</CODE> - the output buffer<DD><CODE>offset</CODE> - the offset into the output buffer<DD><CODE>length</CODE> - the length of random data to generate
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javacard/security/CryptoException.html" title="class in javacard.security">CryptoException</A></CODE> - with the following reason codes:<ul>
 <li><code>CryptoException.ILLEGAL_VALUE</code> if the <code>length</code> parameter is
 zero.</ul></DL>
</DD>
</DL>
<HR>

<A NAME="setSeed(byte[], short, short)"><!-- --></A><H3>
setSeed</H3>
<PRE>
public abstract void <B>setSeed</B>(byte[]&nbsp;buffer,
                             short&nbsp;offset,
                             short&nbsp;length)</PRE>
<DL>
<DD>Seeds the random data generator.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>buffer</CODE> - the input buffer<DD><CODE>offset</CODE> - the offset into the input buffer<DD><CODE>length</CODE> - the length of the seed data</DL>
</DD>
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