27 
  28 import java.security.spec.AlgorithmParameterSpec;
  29 import java.util.*;
  30 import java.io.*;
  31 
  32 import java.nio.ByteBuffer;
  33 
  34 import sun.security.jca.JCAUtil;
  35 
  36 /**
  37  * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
  38  * for the {@code Signature} class, which is used to provide the
  39  * functionality of a digital signature algorithm. Digital signatures are used
  40  * for authentication and integrity assurance of digital data.
  41  *
  42  * <p> All the abstract methods in this class must be implemented by each
  43  * cryptographic service provider who wishes to supply the implementation
  44  * of a particular signature algorithm.
  45  *
  46  * @author Benjamin Renaud

  47  *
  48  *
  49  * @see Signature
  50  */
  51 
  52 public abstract class SignatureSpi {
  53 
  54     /**
  55      * Application-specified source of randomness.
  56      */
  57     protected SecureRandom appRandom = null;
  58 
  59     /**
  60      * Initializes this signature object with the specified
  61      * public key for verification operations.
  62      *
  63      * @param publicKey the public key of the identity whose signature is
  64      * going to be verified.
  65      *
  66      * @exception InvalidKeyException if the key is improperly

  27 
  28 import java.security.spec.AlgorithmParameterSpec;
  29 import java.util.*;
  30 import java.io.*;
  31 
  32 import java.nio.ByteBuffer;
  33 
  34 import sun.security.jca.JCAUtil;
  35 
  36 /**
  37  * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
  38  * for the {@code Signature} class, which is used to provide the
  39  * functionality of a digital signature algorithm. Digital signatures are used
  40  * for authentication and integrity assurance of digital data.
  41  *
  42  * <p> All the abstract methods in this class must be implemented by each
  43  * cryptographic service provider who wishes to supply the implementation
  44  * of a particular signature algorithm.
  45  *
  46  * @author Benjamin Renaud
  47  * @since 1.2
  48  *
  49  *
  50  * @see Signature
  51  */
  52 
  53 public abstract class SignatureSpi {
  54 
  55     /**
  56      * Application-specified source of randomness.
  57      */
  58     protected SecureRandom appRandom = null;
  59 
  60     /**
  61      * Initializes this signature object with the specified
  62      * public key for verification operations.
  63      *
  64      * @param publicKey the public key of the identity whose signature is
  65      * going to be verified.
  66      *
  67      * @exception InvalidKeyException if the key is improperly