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 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
public class org.bouncycastle.util.encoders.Base64
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.util.encoders.Base64
  super_class: java.lang.Object
{
  private static final org.bouncycastle.util.encoders.Encoder encoder;
    descriptor: Lorg/bouncycastle/util/encoders/Encoder;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 14
            new org.bouncycastle.util.encoders.Base64Encoder
            dup
            invokespecial org.bouncycastle.util.encoders.Base64Encoder.<init>:()V
            putstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.util.encoders.Base64 this
         0: .line 12
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.bouncycastle.util.encoders.Base64 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/util/encoders/Base64;

  public static java.lang.String toBase64String(byte[]);
    descriptor: ([B)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // byte[] data
         0: .line 19
            aload 0 /* data */
            iconst_0
            aload 0 /* data */
            arraylength
            invokestatic org.bouncycastle.util.encoders.Base64.toBase64String:([BII)Ljava/lang/String;
            areturn
        end local 0 // byte[] data
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  data  [B
    MethodParameters:
      Name  Flags
      data  

  public static java.lang.String toBase64String(byte[], int, int);
    descriptor: ([BII)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // byte[] data
        start local 1 // int off
        start local 2 // int length
         0: .line 27
            aload 0 /* data */
            iload 1 /* off */
            iload 2 /* length */
            invokestatic org.bouncycastle.util.encoders.Base64.encode:([BII)[B
            astore 3 /* encoded */
        start local 3 // byte[] encoded
         1: .line 28
            aload 3 /* encoded */
            invokestatic org.bouncycastle.util.Strings.fromByteArray:([B)Ljava/lang/String;
            areturn
        end local 3 // byte[] encoded
        end local 2 // int length
        end local 1 // int off
        end local 0 // byte[] data
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     data  [B
            0    2     1      off  I
            0    2     2   length  I
            1    2     3  encoded  [B
    MethodParameters:
        Name  Flags
      data    
      off     
      length  

  public static byte[] encode(byte[]);
    descriptor: ([B)[B
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // byte[] data
         0: .line 39
            aload 0 /* data */
            iconst_0
            aload 0 /* data */
            arraylength
            invokestatic org.bouncycastle.util.encoders.Base64.encode:([BII)[B
            areturn
        end local 0 // byte[] data
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  data  [B
    MethodParameters:
      Name  Flags
      data  

  public static byte[] encode(byte[], int, int);
    descriptor: ([BII)[B
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=6, args_size=3
        start local 0 // byte[] data
        start local 1 // int off
        start local 2 // int length
         0: .line 52
            iload 2 /* length */
            iconst_2
            iadd
            iconst_3
            idiv
            iconst_4
            imul
            istore 3 /* len */
        start local 3 // int len
         1: .line 53
            new java.io.ByteArrayOutputStream
            dup
            iload 3 /* len */
            invokespecial java.io.ByteArrayOutputStream.<init>:(I)V
            astore 4 /* bOut */
        start local 4 // java.io.ByteArrayOutputStream bOut
         2: .line 57
            getstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            aload 0 /* data */
            iload 1 /* off */
            iload 2 /* length */
            aload 4 /* bOut */
            invokeinterface org.bouncycastle.util.encoders.Encoder.encode:([BIILjava/io/OutputStream;)I
            pop
         3: .line 58
            goto 6
         4: .line 59
      StackMap locals: byte[] int int int java.io.ByteArrayOutputStream
      StackMap stack: java.lang.Exception
            astore 5 /* e */
        start local 5 // java.lang.Exception e
         5: .line 61
            new org.bouncycastle.util.encoders.EncoderException
            dup
            new java.lang.StringBuilder
            dup
            ldc "exception encoding base64 string: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 5 /* e */
            invokevirtual java.lang.Exception.getMessage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 5 /* e */
            invokespecial org.bouncycastle.util.encoders.EncoderException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 5 // java.lang.Exception e
         6: .line 64
      StackMap locals:
      StackMap stack:
            aload 4 /* bOut */
            invokevirtual java.io.ByteArrayOutputStream.toByteArray:()[B
            areturn
        end local 4 // java.io.ByteArrayOutputStream bOut
        end local 3 // int len
        end local 2 // int length
        end local 1 // int off
        end local 0 // byte[] data
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    7     0    data  [B
            0    7     1     off  I
            0    7     2  length  I
            1    7     3     len  I
            2    7     4    bOut  Ljava/io/ByteArrayOutputStream;
            5    6     5       e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           2     3       4  Class java.lang.Exception
    MethodParameters:
        Name  Flags
      data    
      off     
      length  

  public static int encode(byte[], java.io.OutputStream);
    descriptor: ([BLjava/io/OutputStream;)I
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // byte[] data
        start local 1 // java.io.OutputStream out
         0: .line 77
            getstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            aload 0 /* data */
            iconst_0
            aload 0 /* data */
            arraylength
            aload 1 /* out */
            invokeinterface org.bouncycastle.util.encoders.Encoder.encode:([BIILjava/io/OutputStream;)I
            ireturn
        end local 1 // java.io.OutputStream out
        end local 0 // byte[] data
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  data  [B
            0    1     1   out  Ljava/io/OutputStream;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      data  
      out   

  public static int encode(byte[], int, int, java.io.OutputStream);
    descriptor: ([BIILjava/io/OutputStream;)I
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=4, args_size=4
        start local 0 // byte[] data
        start local 1 // int off
        start local 2 // int length
        start local 3 // java.io.OutputStream out
         0: .line 92
            getstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            aload 0 /* data */
            iload 1 /* off */
            iload 2 /* length */
            aload 3 /* out */
            invokeinterface org.bouncycastle.util.encoders.Encoder.encode:([BIILjava/io/OutputStream;)I
            ireturn
        end local 3 // java.io.OutputStream out
        end local 2 // int length
        end local 1 // int off
        end local 0 // byte[] data
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    data  [B
            0    1     1     off  I
            0    1     2  length  I
            0    1     3     out  Ljava/io/OutputStream;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
        Name  Flags
      data    
      off     
      length  
      out     

  public static byte[] decode(byte[]);
    descriptor: ([B)[B
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=4, args_size=1
        start local 0 // byte[] data
         0: .line 103
            aload 0 /* data */
            arraylength
            iconst_4
            idiv
            iconst_3
            imul
            istore 1 /* len */
        start local 1 // int len
         1: .line 104
            new java.io.ByteArrayOutputStream
            dup
            iload 1 /* len */
            invokespecial java.io.ByteArrayOutputStream.<init>:(I)V
            astore 2 /* bOut */
        start local 2 // java.io.ByteArrayOutputStream bOut
         2: .line 108
            getstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            aload 0 /* data */
            iconst_0
            aload 0 /* data */
            arraylength
            aload 2 /* bOut */
            invokeinterface org.bouncycastle.util.encoders.Encoder.decode:([BIILjava/io/OutputStream;)I
            pop
         3: .line 109
            goto 6
         4: .line 110
      StackMap locals: byte[] int java.io.ByteArrayOutputStream
      StackMap stack: java.lang.Exception
            astore 3 /* e */
        start local 3 // java.lang.Exception e
         5: .line 112
            new org.bouncycastle.util.encoders.DecoderException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unable to decode base64 data: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 3 /* e */
            invokevirtual java.lang.Exception.getMessage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 3 /* e */
            invokespecial org.bouncycastle.util.encoders.DecoderException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 3 // java.lang.Exception e
         6: .line 115
      StackMap locals:
      StackMap stack:
            aload 2 /* bOut */
            invokevirtual java.io.ByteArrayOutputStream.toByteArray:()[B
            areturn
        end local 2 // java.io.ByteArrayOutputStream bOut
        end local 1 // int len
        end local 0 // byte[] data
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  data  [B
            1    7     1   len  I
            2    7     2  bOut  Ljava/io/ByteArrayOutputStream;
            5    6     3     e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           2     3       4  Class java.lang.Exception
    MethodParameters:
      Name  Flags
      data  

  public static byte[] decode(java.lang.String);
    descriptor: (Ljava/lang/String;)[B
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=4, args_size=1
        start local 0 // java.lang.String data
         0: .line 126
            aload 0 /* data */
            invokevirtual java.lang.String.length:()I
            iconst_4
            idiv
            iconst_3
            imul
            istore 1 /* len */
        start local 1 // int len
         1: .line 127
            new java.io.ByteArrayOutputStream
            dup
            iload 1 /* len */
            invokespecial java.io.ByteArrayOutputStream.<init>:(I)V
            astore 2 /* bOut */
        start local 2 // java.io.ByteArrayOutputStream bOut
         2: .line 131
            getstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            aload 0 /* data */
            aload 2 /* bOut */
            invokeinterface org.bouncycastle.util.encoders.Encoder.decode:(Ljava/lang/String;Ljava/io/OutputStream;)I
            pop
         3: .line 132
            goto 6
         4: .line 133
      StackMap locals: java.lang.String int java.io.ByteArrayOutputStream
      StackMap stack: java.lang.Exception
            astore 3 /* e */
        start local 3 // java.lang.Exception e
         5: .line 135
            new org.bouncycastle.util.encoders.DecoderException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unable to decode base64 string: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 3 /* e */
            invokevirtual java.lang.Exception.getMessage:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 3 /* e */
            invokespecial org.bouncycastle.util.encoders.DecoderException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 3 // java.lang.Exception e
         6: .line 138
      StackMap locals:
      StackMap stack:
            aload 2 /* bOut */
            invokevirtual java.io.ByteArrayOutputStream.toByteArray:()[B
            areturn
        end local 2 // java.io.ByteArrayOutputStream bOut
        end local 1 // int len
        end local 0 // java.lang.String data
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  data  Ljava/lang/String;
            1    7     1   len  I
            2    7     2  bOut  Ljava/io/ByteArrayOutputStream;
            5    6     3     e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           2     3       4  Class java.lang.Exception
    MethodParameters:
      Name  Flags
      data  

  public static int decode(java.lang.String, java.io.OutputStream);
    descriptor: (Ljava/lang/String;Ljava/io/OutputStream;)I
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // java.lang.String data
        start local 1 // java.io.OutputStream out
         0: .line 152
            getstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            aload 0 /* data */
            aload 1 /* out */
            invokeinterface org.bouncycastle.util.encoders.Encoder.decode:(Ljava/lang/String;Ljava/io/OutputStream;)I
            ireturn
        end local 1 // java.io.OutputStream out
        end local 0 // java.lang.String data
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  data  Ljava/lang/String;
            0    1     1   out  Ljava/io/OutputStream;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      data  
      out   

  public static int decode(byte[], int, int, java.io.OutputStream);
    descriptor: ([BIILjava/io/OutputStream;)I
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=5, args_size=4
        start local 0 // byte[] base64Data
        start local 1 // int start
        start local 2 // int length
        start local 3 // java.io.OutputStream out
         0: .line 167
            getstatic org.bouncycastle.util.encoders.Base64.encoder:Lorg/bouncycastle/util/encoders/Encoder;
            aload 0 /* base64Data */
            iload 1 /* start */
            iload 2 /* length */
            aload 3 /* out */
            invokeinterface org.bouncycastle.util.encoders.Encoder.decode:([BIILjava/io/OutputStream;)I
         1: ireturn
         2: .line 169
      StackMap locals:
      StackMap stack: java.lang.Exception
            astore 4 /* e */
        start local 4 // java.lang.Exception e
         3: .line 171
            new org.bouncycastle.util.encoders.DecoderException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unable to decode base64 data: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 4 /* e */
            invokevirtual java.lang.Exception.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.util.encoders.DecoderException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 4 // java.lang.Exception e
        end local 3 // java.io.OutputStream out
        end local 2 // int length
        end local 1 // int start
        end local 0 // byte[] base64Data
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    4     0  base64Data  [B
            0    4     1       start  I
            0    4     2      length  I
            0    4     3         out  Ljava/io/OutputStream;
            3    4     4           e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           0     1       2  Class java.lang.Exception
    MethodParameters:
            Name  Flags
      base64Data  
      start       
      length      
      out         
}
SourceFile: "Base64.java"