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.asn1.DEROutputStream extends java.io.FilterOutputStream implements org.bouncycastle.asn1.DERTags
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.asn1.DEROutputStream
  super_class: java.io.FilterOutputStream
{
  public void <init>(java.io.OutputStream);
    descriptor: (Ljava/io/OutputStream;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // java.io.OutputStream os
         0: .line 13
            aload 0 /* this */
            aload 1 /* os */
            invokespecial java.io.FilterOutputStream.<init>:(Ljava/io/OutputStream;)V
         1: .line 14
            return
        end local 1 // java.io.OutputStream os
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/bouncycastle/asn1/DEROutputStream;
            0    2     1    os  Ljava/io/OutputStream;
    MethodParameters:
      Name  Flags
      os    

  private void writeLength(int);
    descriptor: (I)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=5, args_size=2
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // int length
         0: .line 20
            iload 1 /* length */
            bipush 127
            if_icmple 13
         1: .line 22
            iconst_1
            istore 2 /* size */
        start local 2 // int size
         2: .line 23
            iload 1 /* length */
            istore 3 /* val */
        start local 3 // int val
         3: .line 25
            goto 5
         4: .line 27
      StackMap locals: int int
      StackMap stack:
            iinc 2 /* size */ 1
         5: .line 25
      StackMap locals:
      StackMap stack:
            iload 3 /* val */
            bipush 8
            iushr
            dup
            istore 3 /* val */
            ifne 4
         6: .line 30
            aload 0 /* this */
            iload 2 /* size */
            sipush 128
            ior
            i2b
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
         7: .line 32
            iload 2 /* size */
            iconst_1
            isub
            bipush 8
            imul
            istore 4 /* i */
        start local 4 // int i
         8: goto 11
         9: .line 34
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            iload 1 /* length */
            iload 4 /* i */
            ishr
            i2b
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
        10: .line 32
            iinc 4 /* i */ -8
      StackMap locals:
      StackMap stack:
        11: iload 4 /* i */
            ifge 9
        end local 4 // int i
        end local 3 // int val
        end local 2 // int size
        12: .line 36
            goto 14
        13: .line 39
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iload 1 /* length */
            i2b
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
        14: .line 41
      StackMap locals:
      StackMap stack:
            return
        end local 1 // int length
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   15     0    this  Lorg/bouncycastle/asn1/DEROutputStream;
            0   15     1  length  I
            2   12     2    size  I
            3   12     3     val  I
            8   12     4       i  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
        Name  Flags
      length  

  void writeEncoded(int, byte[]);
    descriptor: (I[B)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // int tag
        start local 2 // byte[] bytes
         0: .line 48
            aload 0 /* this */
            iload 1 /* tag */
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
         1: .line 49
            aload 0 /* this */
            aload 2 /* bytes */
            arraylength
            invokevirtual org.bouncycastle.asn1.DEROutputStream.writeLength:(I)V
         2: .line 50
            aload 0 /* this */
            aload 2 /* bytes */
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:([B)V
         3: .line 51
            return
        end local 2 // byte[] bytes
        end local 1 // int tag
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lorg/bouncycastle/asn1/DEROutputStream;
            0    4     1    tag  I
            0    4     2  bytes  [B
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      tag    
      bytes  

  void writeTag(int, int);
    descriptor: (II)V
    flags: (0x0000) 
    Code:
      stack=5, locals=5, args_size=3
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // int flags
        start local 2 // int tagNo
         0: .line 56
            iload 2 /* tagNo */
            bipush 31
            if_icmpge 3
         1: .line 58
            aload 0 /* this */
            iload 1 /* flags */
            iload 2 /* tagNo */
            ior
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
         2: .line 59
            goto 15
         3: .line 62
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iload 1 /* flags */
            bipush 31
            ior
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
         4: .line 63
            iload 2 /* tagNo */
            sipush 128
            if_icmpge 7
         5: .line 65
            aload 0 /* this */
            iload 2 /* tagNo */
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
         6: .line 66
            goto 15
         7: .line 69
      StackMap locals:
      StackMap stack:
            iconst_5
            newarray 8
            astore 3 /* stack */
        start local 3 // byte[] stack
         8: .line 70
            aload 3 /* stack */
            arraylength
            istore 4 /* pos */
        start local 4 // int pos
         9: .line 72
            aload 3 /* stack */
            iinc 4 /* pos */ -1
            iload 4 /* pos */
            iload 2 /* tagNo */
            bipush 127
            iand
            i2b
            bastore
        10: .line 76
      StackMap locals: byte[] int
      StackMap stack:
            iload 2 /* tagNo */
            bipush 7
            ishr
            istore 2 /* tagNo */
        11: .line 77
            aload 3 /* stack */
            iinc 4 /* pos */ -1
            iload 4 /* pos */
            iload 2 /* tagNo */
            bipush 127
            iand
            sipush 128
            ior
            i2b
            bastore
        12: .line 79
            iload 2 /* tagNo */
            bipush 127
        13: .line 74
            if_icmpgt 10
        14: .line 81
            aload 0 /* this */
            aload 3 /* stack */
            iload 4 /* pos */
            aload 3 /* stack */
            arraylength
            iload 4 /* pos */
            isub
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:([BII)V
        end local 4 // int pos
        end local 3 // byte[] stack
        15: .line 84
      StackMap locals:
      StackMap stack:
            return
        end local 2 // int tagNo
        end local 1 // int flags
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0   16     0   this  Lorg/bouncycastle/asn1/DEROutputStream;
            0   16     1  flags  I
            0   16     2  tagNo  I
            8   15     3  stack  [B
            9   15     4    pos  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      flags  
      tagNo  

  void writeEncoded(int, int, byte[]);
    descriptor: (II[B)V
    flags: (0x0000) 
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // int flags
        start local 2 // int tagNo
        start local 3 // byte[] bytes
         0: .line 89
            aload 0 /* this */
            iload 1 /* flags */
            iload 2 /* tagNo */
            invokevirtual org.bouncycastle.asn1.DEROutputStream.writeTag:(II)V
         1: .line 90
            aload 0 /* this */
            aload 3 /* bytes */
            arraylength
            invokevirtual org.bouncycastle.asn1.DEROutputStream.writeLength:(I)V
         2: .line 91
            aload 0 /* this */
            aload 3 /* bytes */
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:([B)V
         3: .line 92
            return
        end local 3 // byte[] bytes
        end local 2 // int tagNo
        end local 1 // int flags
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lorg/bouncycastle/asn1/DEROutputStream;
            0    4     1  flags  I
            0    4     2  tagNo  I
            0    4     3  bytes  [B
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      flags  
      tagNo  
      bytes  

  protected void writeNull();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
         0: .line 97
            aload 0 /* this */
            iconst_5
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
         1: .line 98
            aload 0 /* this */
            iconst_0
            invokevirtual org.bouncycastle.asn1.DEROutputStream.write:(I)V
         2: .line 99
            return
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/bouncycastle/asn1/DEROutputStream;
    Exceptions:
      throws java.io.IOException

  public void write(byte[]);
    descriptor: ([B)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // byte[] buf
         0: .line 104
            aload 0 /* this */
            getfield org.bouncycastle.asn1.DEROutputStream.out:Ljava/io/OutputStream;
            aload 1 /* buf */
            iconst_0
            aload 1 /* buf */
            arraylength
            invokevirtual java.io.OutputStream.write:([BII)V
         1: .line 105
            return
        end local 1 // byte[] buf
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/bouncycastle/asn1/DEROutputStream;
            0    2     1   buf  [B
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      buf   

  public void write(byte[], int, int);
    descriptor: ([BII)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // byte[] buf
        start local 2 // int offSet
        start local 3 // int len
         0: .line 110
            aload 0 /* this */
            getfield org.bouncycastle.asn1.DEROutputStream.out:Ljava/io/OutputStream;
            aload 1 /* buf */
            iload 2 /* offSet */
            iload 3 /* len */
            invokevirtual java.io.OutputStream.write:([BII)V
         1: .line 111
            return
        end local 3 // int len
        end local 2 // int offSet
        end local 1 // byte[] buf
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/bouncycastle/asn1/DEROutputStream;
            0    2     1     buf  [B
            0    2     2  offSet  I
            0    2     3     len  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
        Name  Flags
      buf     
      offSet  
      len     

  public void writeObject(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.DEROutputStream this
        start local 1 // java.lang.Object obj
         0: .line 117
            aload 1 /* obj */
            ifnonnull 3
         1: .line 119
            aload 0 /* this */
            invokevirtual org.bouncycastle.asn1.DEROutputStream.writeNull:()V
         2: .line 120
            goto 10
         3: .line 121
      StackMap locals:
      StackMap stack:
            aload 1 /* obj */
            instanceof org.bouncycastle.asn1.DERObject
            ifeq 6
         4: .line 123
            aload 1 /* obj */
            checkcast org.bouncycastle.asn1.DERObject
            aload 0 /* this */
            invokevirtual org.bouncycastle.asn1.DERObject.encode:(Lorg/bouncycastle/asn1/DEROutputStream;)V
         5: .line 124
            goto 10
         6: .line 125
      StackMap locals:
      StackMap stack:
            aload 1 /* obj */
            instanceof org.bouncycastle.asn1.DEREncodable
            ifeq 9
         7: .line 127
            aload 1 /* obj */
            checkcast org.bouncycastle.asn1.DEREncodable
            invokeinterface org.bouncycastle.asn1.DEREncodable.getDERObject:()Lorg/bouncycastle/asn1/DERObject;
            aload 0 /* this */
            invokevirtual org.bouncycastle.asn1.DERObject.encode:(Lorg/bouncycastle/asn1/DEROutputStream;)V
         8: .line 128
            goto 10
         9: .line 131
      StackMap locals:
      StackMap stack:
            new java.io.IOException
            dup
            ldc "object not DEREncodable"
            invokespecial java.io.IOException.<init>:(Ljava/lang/String;)V
            athrow
        10: .line 133
      StackMap locals:
      StackMap stack:
            return
        end local 1 // java.lang.Object obj
        end local 0 // org.bouncycastle.asn1.DEROutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   11     0  this  Lorg/bouncycastle/asn1/DEROutputStream;
            0   11     1   obj  Ljava/lang/Object;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      obj   
}
SourceFile: "DEROutputStream.java"