IT. Expert System.

All Implemented Interfaces:

Serializable, SHA1_Data

public class SHA1PRNG_SecureRandomImpl
extends SecureRandomSpi
implements Serializable, SHA1_Data

See Also:

Serialized Form

• Field Summary

  • Fields inherited from interface org.apache.harmony.security.provider.crypto.SHA1_Data

    BYTES_OFFSET, DIGEST_LENGTH, H0, H1, H2, H3, H4, HASH_OFFSET

• Constructor Summary

  Constructors

  Constructor and Description
  SHA1PRNG_SecureRandomImpl() Creates object and sets implementation variables to their initial values

• Method Summary

  Methods

  Modifier and Type	Method and Description
  protected byte[]	engineGenerateSeed(int numBytes) Returns a required number of random bytes.
  protected void	engineNextBytes(byte[] bytes) Writes random bytes into an array supplied.
  protected void	engineSetSeed(byte[] seed) Changes current seed by supplementing a seed argument to the current seed, if this already set; the argument is used as first seed otherwise.

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Detail

  • SHA1PRNG_SecureRandomImpl

    public SHA1PRNG_SecureRandomImpl()

    Creates object and sets implementation variables to their initial values

• Method Detail

  • engineSetSeed

    protected void engineSetSeed(byte[] seed)

    Changes current seed by supplementing a seed argument to the current seed, if this already set; the argument is used as first seed otherwise.
    The method overrides "engineSetSeed(byte[])" in class SecureRandomSpi.

    Specified by:

    engineSetSeed in class SecureRandomSpi

    Parameters:

    seed - - byte array

    Throws:

    NullPointerException - - if null is passed to the "seed" argument

  • engineGenerateSeed

    protected byte[] engineGenerateSeed(int numBytes)

    Returns a required number of random bytes.
    The method overrides "engineGenerateSeed (int)" in class SecureRandomSpi.
    

    Specified by:

    engineGenerateSeed in class SecureRandomSpi

    Parameters:

    numBytes - - number of bytes to return; should be >= 0.

    Returns:

    byte array containing bits in order from left to right

    Throws:

    InvalidParameterException - - if numBytes < 0

  • engineNextBytes

    protected void engineNextBytes(byte[] bytes)

    Writes random bytes into an array supplied. Bits in a byte are from left to right.
    To generate random bytes, the "expansion of source bits" method is used, that is, the current seed with a 64-bit counter appended is used to compute new bits. The counter is incremented by 1 for each 20-byte output.
    The method overrides engineNextBytes in class SecureRandomSpi.

    Specified by:

    engineNextBytes in class SecureRandomSpi

    Parameters:

    bytes - - byte array to be filled in with bytes

    Throws:

    NullPointerException - - if null is passed to the "bytes" argument