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 class org.bouncycastle.operator.bc.BcDigestCalculatorProvider implements org.bouncycastle.operator.DigestCalculatorProvider
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.operator.bc.BcDigestCalculatorProvider
  super_class: java.lang.Object
{
  private org.bouncycastle.operator.bc.BcDigestProvider digestProvider;
    descriptor: Lorg/bouncycastle/operator/bc/BcDigestProvider;
    flags: (0x0002) ACC_PRIVATE

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.bouncycastle.operator.bc.BcDigestCalculatorProvider this
         0: .line 14
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 17
            aload 0 /* this */
            getstatic org.bouncycastle.operator.bc.BcDefaultDigestProvider.INSTANCE:Lorg/bouncycastle/operator/bc/BcDigestProvider;
            putfield org.bouncycastle.operator.bc.BcDigestCalculatorProvider.digestProvider:Lorg/bouncycastle/operator/bc/BcDigestProvider;
         2: .line 14
            return
        end local 0 // org.bouncycastle.operator.bc.BcDigestCalculatorProvider this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/bouncycastle/operator/bc/BcDigestCalculatorProvider;

  public org.bouncycastle.operator.DigestCalculator get(org.bouncycastle.asn1.x509.AlgorithmIdentifier);
    descriptor: (Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;)Lorg/bouncycastle/operator/DigestCalculator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=4, args_size=2
        start local 0 // org.bouncycastle.operator.bc.BcDigestCalculatorProvider this
        start local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier algorithm
         0: .line 22
            aload 0 /* this */
            getfield org.bouncycastle.operator.bc.BcDigestCalculatorProvider.digestProvider:Lorg/bouncycastle/operator/bc/BcDigestProvider;
            aload 1 /* algorithm */
            invokeinterface org.bouncycastle.operator.bc.BcDigestProvider.get:(Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;)Lorg/bouncycastle/crypto/ExtendedDigest;
            astore 2 /* dig */
        start local 2 // org.bouncycastle.crypto.Digest dig
         1: .line 24
            new org.bouncycastle.operator.bc.BcDigestCalculatorProvider$DigestOutputStream
            dup
            aload 0 /* this */
            aload 2 /* dig */
            invokespecial org.bouncycastle.operator.bc.BcDigestCalculatorProvider$DigestOutputStream.<init>:(Lorg/bouncycastle/operator/bc/BcDigestCalculatorProvider;Lorg/bouncycastle/crypto/Digest;)V
            astore 3 /* stream */
        start local 3 // org.bouncycastle.operator.bc.BcDigestCalculatorProvider$DigestOutputStream stream
         2: .line 26
            new org.bouncycastle.operator.bc.BcDigestCalculatorProvider$1
            dup
            aload 0 /* this */
            aload 1 /* algorithm */
            aload 3 /* stream */
            invokespecial org.bouncycastle.operator.bc.BcDigestCalculatorProvider$1.<init>:(Lorg/bouncycastle/operator/bc/BcDigestCalculatorProvider;Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;Lorg/bouncycastle/operator/bc/BcDigestCalculatorProvider$DigestOutputStream;)V
            areturn
        end local 3 // org.bouncycastle.operator.bc.BcDigestCalculatorProvider$DigestOutputStream stream
        end local 2 // org.bouncycastle.crypto.Digest dig
        end local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier algorithm
        end local 0 // org.bouncycastle.operator.bc.BcDigestCalculatorProvider this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0       this  Lorg/bouncycastle/operator/bc/BcDigestCalculatorProvider;
            0    3     1  algorithm  Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
            1    3     2        dig  Lorg/bouncycastle/crypto/Digest;
            2    3     3     stream  Lorg/bouncycastle/operator/bc/BcDigestCalculatorProvider$DigestOutputStream;
    Exceptions:
      throws org.bouncycastle.operator.OperatorCreationException
    MethodParameters:
           Name  Flags
      algorithm  final
}
SourceFile: "BcDigestCalculatorProvider.java"
NestMembers:
  org.bouncycastle.operator.bc.BcDigestCalculatorProvider$1  org.bouncycastle.operator.bc.BcDigestCalculatorProvider$DigestOutputStream
InnerClasses:
  org.bouncycastle.operator.bc.BcDigestCalculatorProvider$1
  private DigestOutputStream = org.bouncycastle.operator.bc.BcDigestCalculatorProvider$DigestOutputStream of org.bouncycastle.operator.bc.BcDigestCalculatorProvider