http://www.bouncycastle.org/java.html: The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
  • The Legion of the Bouncy Castle Inc. 
public interface org.bouncycastle.operator.DigestCalculator
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.bouncycastle.operator.DigestCalculator
  super_class: java.lang.Object
{
  public abstract org.bouncycastle.asn1.x509.AlgorithmIdentifier getAlgorithmIdentifier();
    descriptor: ()Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract java.io.OutputStream getOutputStream();
    descriptor: ()Ljava/io/OutputStream;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract byte[] getDigest();
    descriptor: ()[B
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "DigestCalculator.java"