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.eac.operator.jcajce.JcaEACSignatureVerifierBuilder
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder
  super_class: java.lang.Object
{
  private org.bouncycastle.eac.operator.jcajce.EACHelper helper;
    descriptor: Lorg/bouncycastle/eac/operator/jcajce/EACHelper;
    flags: (0x0002) ACC_PRIVATE

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
         0: .line 24
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 26
            aload 0 /* this */
            new org.bouncycastle.eac.operator.jcajce.DefaultEACHelper
            dup
            invokespecial org.bouncycastle.eac.operator.jcajce.DefaultEACHelper.<init>:()V
            putfield org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder.helper:Lorg/bouncycastle/eac/operator/jcajce/EACHelper;
         2: .line 24
            return
        end local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;

  public org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder setProvider(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
        start local 1 // java.lang.String providerName
         0: .line 30
            aload 0 /* this */
            new org.bouncycastle.eac.operator.jcajce.NamedEACHelper
            dup
            aload 1 /* providerName */
            invokespecial org.bouncycastle.eac.operator.jcajce.NamedEACHelper.<init>:(Ljava/lang/String;)V
            putfield org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder.helper:Lorg/bouncycastle/eac/operator/jcajce/EACHelper;
         1: .line 32
            aload 0 /* this */
            areturn
        end local 1 // java.lang.String providerName
        end local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    2     0          this  Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;
            0    2     1  providerName  Ljava/lang/String;
    MethodParameters:
              Name  Flags
      providerName  

  public org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder setProvider(java.security.Provider);
    descriptor: (Ljava/security/Provider;)Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
        start local 1 // java.security.Provider provider
         0: .line 37
            aload 0 /* this */
            new org.bouncycastle.eac.operator.jcajce.ProviderEACHelper
            dup
            aload 1 /* provider */
            invokespecial org.bouncycastle.eac.operator.jcajce.ProviderEACHelper.<init>:(Ljava/security/Provider;)V
            putfield org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder.helper:Lorg/bouncycastle/eac/operator/jcajce/EACHelper;
         1: .line 39
            aload 0 /* this */
            areturn
        end local 1 // java.security.Provider provider
        end local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    2     0      this  Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;
            0    2     1  provider  Ljava/security/Provider;
    MethodParameters:
          Name  Flags
      provider  

  public org.bouncycastle.eac.operator.EACSignatureVerifier build(org.bouncycastle.asn1.ASN1ObjectIdentifier, java.security.PublicKey);
    descriptor: (Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;Ljava/security/PublicKey;)Lorg/bouncycastle/eac/operator/EACSignatureVerifier;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=5, args_size=3
        start local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
        start local 1 // org.bouncycastle.asn1.ASN1ObjectIdentifier usageOid
        start local 2 // java.security.PublicKey pubKey
         0: .line 48
            aload 0 /* this */
            getfield org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder.helper:Lorg/bouncycastle/eac/operator/jcajce/EACHelper;
            aload 1 /* usageOid */
            invokevirtual org.bouncycastle.eac.operator.jcajce.EACHelper.getSignature:(Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;)Ljava/security/Signature;
            astore 3 /* sig */
        start local 3 // java.security.Signature sig
         1: .line 50
            aload 3 /* sig */
            aload 2 /* pubKey */
            invokevirtual java.security.Signature.initVerify:(Ljava/security/PublicKey;)V
         2: .line 51
            goto 9
        end local 3 // java.security.Signature sig
         3: .line 52
      StackMap locals:
      StackMap stack: java.security.NoSuchAlgorithmException
            astore 4 /* e */
        start local 4 // java.security.NoSuchAlgorithmException e
         4: .line 54
            new org.bouncycastle.operator.OperatorCreationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unable to find algorithm: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 4 /* e */
            invokevirtual java.security.NoSuchAlgorithmException.getMessage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 4 /* e */
            invokespecial org.bouncycastle.operator.OperatorCreationException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 4 // java.security.NoSuchAlgorithmException e
         5: .line 56
      StackMap locals:
      StackMap stack: java.security.NoSuchProviderException
            astore 4 /* e */
        start local 4 // java.security.NoSuchProviderException e
         6: .line 58
            new org.bouncycastle.operator.OperatorCreationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unable to find provider: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 4 /* e */
            invokevirtual java.security.NoSuchProviderException.getMessage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 4 /* e */
            invokespecial org.bouncycastle.operator.OperatorCreationException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 4 // java.security.NoSuchProviderException e
         7: .line 60
      StackMap locals:
      StackMap stack: java.security.InvalidKeyException
            astore 4 /* e */
        start local 4 // java.security.InvalidKeyException e
         8: .line 62
            new org.bouncycastle.operator.OperatorCreationException
            dup
            new java.lang.StringBuilder
            dup
            ldc "invalid key: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 4 /* e */
            invokevirtual java.security.InvalidKeyException.getMessage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 4 /* e */
            invokespecial org.bouncycastle.operator.OperatorCreationException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 4 // java.security.InvalidKeyException e
        start local 3 // java.security.Signature sig
         9: .line 65
      StackMap locals: java.security.Signature
      StackMap stack:
            new org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$SignatureOutputStream
            dup
            aload 0 /* this */
            aload 3 /* sig */
            invokespecial org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$SignatureOutputStream.<init>:(Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;Ljava/security/Signature;)V
            astore 4 /* sigStream */
        start local 4 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$SignatureOutputStream sigStream
        10: .line 67
            new org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$1
            dup
            aload 0 /* this */
            aload 1 /* usageOid */
            aload 4 /* sigStream */
            invokespecial org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$1.<init>:(Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder$SignatureOutputStream;)V
            areturn
        end local 4 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$SignatureOutputStream sigStream
        end local 3 // java.security.Signature sig
        end local 2 // java.security.PublicKey pubKey
        end local 1 // org.bouncycastle.asn1.ASN1ObjectIdentifier usageOid
        end local 0 // org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   11     0       this  Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder;
            0   11     1   usageOid  Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            0   11     2     pubKey  Ljava/security/PublicKey;
            1    3     3        sig  Ljava/security/Signature;
            9   11     3        sig  Ljava/security/Signature;
            4    5     4          e  Ljava/security/NoSuchAlgorithmException;
            6    7     4          e  Ljava/security/NoSuchProviderException;
            8    9     4          e  Ljava/security/InvalidKeyException;
           10   11     4  sigStream  Lorg/bouncycastle/eac/operator/jcajce/JcaEACSignatureVerifierBuilder$SignatureOutputStream;
      Exception table:
        from    to  target  type
           0     2       3  Class java.security.NoSuchAlgorithmException
           0     2       5  Class java.security.NoSuchProviderException
           0     2       7  Class java.security.InvalidKeyException
    Exceptions:
      throws org.bouncycastle.operator.OperatorCreationException
    MethodParameters:
          Name  Flags
      usageOid  final
      pubKey    

  private static byte[] derEncode(byte[]);
    descriptor: ([B)[B
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=7, locals=6, args_size=1
        start local 0 // byte[] rawSign
         0: .line 111
            aload 0 /* rawSign */
            arraylength
            iconst_2
            idiv
            istore 1 /* len */
        start local 1 // int len
         1: .line 113
            iload 1 /* len */
            newarray 8
            astore 2 /* r */
        start local 2 // byte[] r
         2: .line 114
            iload 1 /* len */
            newarray 8
            astore 3 /* s */
        start local 3 // byte[] s
         3: .line 115
            aload 0 /* rawSign */
            iconst_0
            aload 2 /* r */
            iconst_0
            iload 1 /* len */
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         4: .line 116
            aload 0 /* rawSign */
            iload 1 /* len */
            aload 3 /* s */
            iconst_0
            iload 1 /* len */
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         5: .line 118
            new org.bouncycastle.asn1.ASN1EncodableVector
            dup
            invokespecial org.bouncycastle.asn1.ASN1EncodableVector.<init>:()V
            astore 4 /* v */
        start local 4 // org.bouncycastle.asn1.ASN1EncodableVector v
         6: .line 119
            aload 4 /* v */
            new org.bouncycastle.asn1.ASN1Integer
            dup
            new java.math.BigInteger
            dup
            iconst_1
            aload 2 /* r */
            invokespecial java.math.BigInteger.<init>:(I[B)V
            invokespecial org.bouncycastle.asn1.ASN1Integer.<init>:(Ljava/math/BigInteger;)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/ASN1Encodable;)V
         7: .line 120
            aload 4 /* v */
            new org.bouncycastle.asn1.ASN1Integer
            dup
            new java.math.BigInteger
            dup
            iconst_1
            aload 3 /* s */
            invokespecial java.math.BigInteger.<init>:(I[B)V
            invokespecial org.bouncycastle.asn1.ASN1Integer.<init>:(Ljava/math/BigInteger;)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/ASN1Encodable;)V
         8: .line 122
            new org.bouncycastle.asn1.DERSequence
            dup
            aload 4 /* v */
            invokespecial org.bouncycastle.asn1.DERSequence.<init>:(Lorg/bouncycastle/asn1/ASN1EncodableVector;)V
            astore 5 /* seq */
        start local 5 // org.bouncycastle.asn1.DERSequence seq
         9: .line 123
            aload 5 /* seq */
            invokevirtual org.bouncycastle.asn1.DERSequence.getEncoded:()[B
            areturn
        end local 5 // org.bouncycastle.asn1.DERSequence seq
        end local 4 // org.bouncycastle.asn1.ASN1EncodableVector v
        end local 3 // byte[] s
        end local 2 // byte[] r
        end local 1 // int len
        end local 0 // byte[] rawSign
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   10     0  rawSign  [B
            1   10     1      len  I
            2   10     2        r  [B
            3   10     3        s  [B
            6   10     4        v  Lorg/bouncycastle/asn1/ASN1EncodableVector;
            9   10     5      seq  Lorg/bouncycastle/asn1/DERSequence;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
         Name  Flags
      rawSign  
}
SourceFile: "JcaEACSignatureVerifierBuilder.java"
NestMembers:
  org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$1  org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$SignatureOutputStream
InnerClasses:
  org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$1
  private SignatureOutputStream = org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder$SignatureOutputStream of org.bouncycastle.eac.operator.jcajce.JcaEACSignatureVerifierBuilder