http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5. 
public class org.bouncycastle.jce.PrincipalUtil
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.jce.PrincipalUtil
  super_class: java.lang.Object
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.jce.PrincipalUtil this
         0: .line 16
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.bouncycastle.jce.PrincipalUtil this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/jce/PrincipalUtil;

  public static org.bouncycastle.jce.X509Principal getIssuerX509Principal(java.security.cert.X509Certificate);
    descriptor: (Ljava/security/cert/X509Certificate;)Lorg/bouncycastle/jce/X509Principal;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // java.security.cert.X509Certificate cert
         0: .line 28
            aload 0 /* cert */
            invokevirtual java.security.cert.X509Certificate.getTBSCertificate:()[B
            invokestatic org.bouncycastle.asn1.ASN1Object.fromByteArray:([B)Lorg/bouncycastle/asn1/ASN1Object;
         1: .line 27
            invokestatic org.bouncycastle.asn1.x509.TBSCertificateStructure.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/x509/TBSCertificateStructure;
            astore 1 /* tbsCert */
        start local 1 // org.bouncycastle.asn1.x509.TBSCertificateStructure tbsCert
         2: .line 30
            new org.bouncycastle.jce.X509Principal
            dup
            aload 1 /* tbsCert */
            invokevirtual org.bouncycastle.asn1.x509.TBSCertificateStructure.getIssuer:()Lorg/bouncycastle/asn1/x509/X509Name;
            invokespecial org.bouncycastle.jce.X509Principal.<init>:(Lorg/bouncycastle/asn1/x509/X509Name;)V
         3: areturn
        end local 1 // org.bouncycastle.asn1.x509.TBSCertificateStructure tbsCert
         4: .line 32
      StackMap locals:
      StackMap stack: java.io.IOException
            astore 1 /* e */
        start local 1 // java.io.IOException e
         5: .line 34
            new java.security.cert.CertificateEncodingException
            dup
            aload 1 /* e */
            invokevirtual java.io.IOException.toString:()Ljava/lang/String;
            invokespecial java.security.cert.CertificateEncodingException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.io.IOException e
        end local 0 // java.security.cert.X509Certificate cert
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    6     0     cert  Ljava/security/cert/X509Certificate;
            2    4     1  tbsCert  Lorg/bouncycastle/asn1/x509/TBSCertificateStructure;
            5    6     1        e  Ljava/io/IOException;
      Exception table:
        from    to  target  type
           0     3       4  Class java.io.IOException
    Exceptions:
      throws java.security.cert.CertificateEncodingException
    MethodParameters:
      Name  Flags
      cert  

  public static org.bouncycastle.jce.X509Principal getSubjectX509Principal(java.security.cert.X509Certificate);
    descriptor: (Ljava/security/cert/X509Certificate;)Lorg/bouncycastle/jce/X509Principal;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // java.security.cert.X509Certificate cert
         0: .line 48
            aload 0 /* cert */
            invokevirtual java.security.cert.X509Certificate.getTBSCertificate:()[B
            invokestatic org.bouncycastle.asn1.ASN1Object.fromByteArray:([B)Lorg/bouncycastle/asn1/ASN1Object;
         1: .line 47
            invokestatic org.bouncycastle.asn1.x509.TBSCertificateStructure.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/x509/TBSCertificateStructure;
            astore 1 /* tbsCert */
        start local 1 // org.bouncycastle.asn1.x509.TBSCertificateStructure tbsCert
         2: .line 49
            new org.bouncycastle.jce.X509Principal
            dup
            aload 1 /* tbsCert */
            invokevirtual org.bouncycastle.asn1.x509.TBSCertificateStructure.getSubject:()Lorg/bouncycastle/asn1/x509/X509Name;
            invokespecial org.bouncycastle.jce.X509Principal.<init>:(Lorg/bouncycastle/asn1/x509/X509Name;)V
         3: areturn
        end local 1 // org.bouncycastle.asn1.x509.TBSCertificateStructure tbsCert
         4: .line 51
      StackMap locals:
      StackMap stack: java.io.IOException
            astore 1 /* e */
        start local 1 // java.io.IOException e
         5: .line 53
            new java.security.cert.CertificateEncodingException
            dup
            aload 1 /* e */
            invokevirtual java.io.IOException.toString:()Ljava/lang/String;
            invokespecial java.security.cert.CertificateEncodingException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.io.IOException e
        end local 0 // java.security.cert.X509Certificate cert
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    6     0     cert  Ljava/security/cert/X509Certificate;
            2    4     1  tbsCert  Lorg/bouncycastle/asn1/x509/TBSCertificateStructure;
            5    6     1        e  Ljava/io/IOException;
      Exception table:
        from    to  target  type
           0     3       4  Class java.io.IOException
    Exceptions:
      throws java.security.cert.CertificateEncodingException
    MethodParameters:
      Name  Flags
      cert  

  public static org.bouncycastle.jce.X509Principal getIssuerX509Principal(java.security.cert.X509CRL);
    descriptor: (Ljava/security/cert/X509CRL;)Lorg/bouncycastle/jce/X509Principal;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // java.security.cert.X509CRL crl
         0: .line 67
            aload 0 /* crl */
            invokevirtual java.security.cert.X509CRL.getTBSCertList:()[B
            invokestatic org.bouncycastle.asn1.ASN1Object.fromByteArray:([B)Lorg/bouncycastle/asn1/ASN1Object;
         1: .line 66
            invokestatic org.bouncycastle.asn1.x509.TBSCertList.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/x509/TBSCertList;
            astore 1 /* tbsCertList */
        start local 1 // org.bouncycastle.asn1.x509.TBSCertList tbsCertList
         2: .line 69
            new org.bouncycastle.jce.X509Principal
            dup
            aload 1 /* tbsCertList */
            invokevirtual org.bouncycastle.asn1.x509.TBSCertList.getIssuer:()Lorg/bouncycastle/asn1/x509/X509Name;
            invokespecial org.bouncycastle.jce.X509Principal.<init>:(Lorg/bouncycastle/asn1/x509/X509Name;)V
         3: areturn
        end local 1 // org.bouncycastle.asn1.x509.TBSCertList tbsCertList
         4: .line 71
      StackMap locals:
      StackMap stack: java.io.IOException
            astore 1 /* e */
        start local 1 // java.io.IOException e
         5: .line 73
            new java.security.cert.CRLException
            dup
            aload 1 /* e */
            invokevirtual java.io.IOException.toString:()Ljava/lang/String;
            invokespecial java.security.cert.CRLException.<init>:(Ljava/lang/String;)V
            athrow
        end local 1 // java.io.IOException e
        end local 0 // java.security.cert.X509CRL crl
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    6     0          crl  Ljava/security/cert/X509CRL;
            2    4     1  tbsCertList  Lorg/bouncycastle/asn1/x509/TBSCertList;
            5    6     1            e  Ljava/io/IOException;
      Exception table:
        from    to  target  type
           0     3       4  Class java.io.IOException
    Exceptions:
      throws java.security.cert.CRLException
    MethodParameters:
      Name  Flags
      crl   
}
SourceFile: "PrincipalUtil.java"