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.crypto.engines.DESedeEngine extends org.bouncycastle.crypto.engines.DESEngine
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.crypto.engines.DESedeEngine
  super_class: org.bouncycastle.crypto.engines.DESEngine
{
  protected static final int BLOCK_SIZE;
    descriptor: I
    flags: (0x001c) ACC_PROTECTED, ACC_STATIC, ACC_FINAL
    ConstantValue: 8

  private int[] workingKey1;
    descriptor: [I
    flags: (0x0002) ACC_PRIVATE

  private int[] workingKey2;
    descriptor: [I
    flags: (0x0002) ACC_PRIVATE

  private int[] workingKey3;
    descriptor: [I
    flags: (0x0002) ACC_PRIVATE

  private boolean forEncryption;
    descriptor: Z
    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.crypto.engines.DESedeEngine this
         0: .line 25
            aload 0 /* this */
            invokespecial org.bouncycastle.crypto.engines.DESEngine.<init>:()V
         1: .line 16
            aload 0 /* this */
            aconst_null
            putfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey1:[I
         2: .line 17
            aload 0 /* this */
            aconst_null
            putfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey2:[I
         3: .line 18
            aload 0 /* this */
            aconst_null
            putfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey3:[I
         4: .line 27
            return
        end local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/bouncycastle/crypto/engines/DESedeEngine;

  public void init(boolean, org.bouncycastle.crypto.CipherParameters);
    descriptor: (ZLorg/bouncycastle/crypto/CipherParameters;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=7, args_size=3
        start local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
        start local 1 // boolean encrypting
        start local 2 // org.bouncycastle.crypto.CipherParameters params
         0: .line 41
            aload 2 /* params */
            instanceof org.bouncycastle.crypto.params.KeyParameter
            ifne 2
         1: .line 43
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "invalid parameter passed to DESede init - "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* params */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 46
      StackMap locals:
      StackMap stack:
            aload 2 /* params */
            checkcast org.bouncycastle.crypto.params.KeyParameter
            invokevirtual org.bouncycastle.crypto.params.KeyParameter.getKey:()[B
            astore 3 /* keyMaster */
        start local 3 // byte[] keyMaster
         3: .line 48
            aload 3 /* keyMaster */
            arraylength
            bipush 24
            if_icmpeq 5
            aload 3 /* keyMaster */
            arraylength
            bipush 16
            if_icmpeq 5
         4: .line 50
            new java.lang.IllegalArgumentException
            dup
            ldc "key size must be 16 or 24 bytes."
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 53
      StackMap locals: byte[]
      StackMap stack:
            aload 0 /* this */
            iload 1 /* encrypting */
            putfield org.bouncycastle.crypto.engines.DESedeEngine.forEncryption:Z
         6: .line 55
            bipush 8
            newarray 8
            astore 4 /* key1 */
        start local 4 // byte[] key1
         7: .line 56
            aload 3 /* keyMaster */
            iconst_0
            aload 4 /* key1 */
            iconst_0
            aload 4 /* key1 */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         8: .line 57
            aload 0 /* this */
            aload 0 /* this */
            iload 1 /* encrypting */
            aload 4 /* key1 */
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.generateWorkingKey:(Z[B)[I
            putfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey1:[I
         9: .line 59
            bipush 8
            newarray 8
            astore 5 /* key2 */
        start local 5 // byte[] key2
        10: .line 60
            aload 3 /* keyMaster */
            bipush 8
            aload 5 /* key2 */
            iconst_0
            aload 5 /* key2 */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        11: .line 61
            aload 0 /* this */
            aload 0 /* this */
            iload 1 /* encrypting */
            ifeq 12
            iconst_0
            goto 13
      StackMap locals: org.bouncycastle.crypto.engines.DESedeEngine int org.bouncycastle.crypto.CipherParameters byte[] byte[] byte[]
      StackMap stack: org.bouncycastle.crypto.engines.DESedeEngine org.bouncycastle.crypto.engines.DESedeEngine
        12: iconst_1
      StackMap locals: org.bouncycastle.crypto.engines.DESedeEngine int org.bouncycastle.crypto.CipherParameters byte[] byte[] byte[]
      StackMap stack: org.bouncycastle.crypto.engines.DESedeEngine org.bouncycastle.crypto.engines.DESedeEngine int
        13: aload 5 /* key2 */
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.generateWorkingKey:(Z[B)[I
            putfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey2:[I
        14: .line 63
            aload 3 /* keyMaster */
            arraylength
            bipush 24
            if_icmpne 19
        15: .line 65
            bipush 8
            newarray 8
            astore 6 /* key3 */
        start local 6 // byte[] key3
        16: .line 66
            aload 3 /* keyMaster */
            bipush 16
            aload 6 /* key3 */
            iconst_0
            aload 6 /* key3 */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        17: .line 67
            aload 0 /* this */
            aload 0 /* this */
            iload 1 /* encrypting */
            aload 6 /* key3 */
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.generateWorkingKey:(Z[B)[I
            putfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey3:[I
        end local 6 // byte[] key3
        18: .line 68
            goto 20
        19: .line 71
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey1:[I
            putfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey3:[I
        20: .line 73
      StackMap locals:
      StackMap stack:
            return
        end local 5 // byte[] key2
        end local 4 // byte[] key1
        end local 3 // byte[] keyMaster
        end local 2 // org.bouncycastle.crypto.CipherParameters params
        end local 1 // boolean encrypting
        end local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   21     0        this  Lorg/bouncycastle/crypto/engines/DESedeEngine;
            0   21     1  encrypting  Z
            0   21     2      params  Lorg/bouncycastle/crypto/CipherParameters;
            3   21     3   keyMaster  [B
            7   21     4        key1  [B
           10   21     5        key2  [B
           16   18     6        key3  [B
    MethodParameters:
            Name  Flags
      encrypting  
      params      

  public java.lang.String getAlgorithmName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
         0: .line 77
            ldc "DESede"
            areturn
        end local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/crypto/engines/DESedeEngine;

  public int getBlockSize();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
         0: .line 82
            bipush 8
            ireturn
        end local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/crypto/engines/DESedeEngine;

  public int processBlock(byte[], int, byte[], int);
    descriptor: ([BI[BI)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=6, args_size=5
        start local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
        start local 1 // byte[] in
        start local 2 // int inOff
        start local 3 // byte[] out
        start local 4 // int outOff
         0: .line 91
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey1:[I
            ifnonnull 2
         1: .line 93
            new java.lang.IllegalStateException
            dup
            ldc "DESede engine not initialised"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 96
      StackMap locals:
      StackMap stack:
            iload 2 /* inOff */
            bipush 8
            iadd
            aload 1 /* in */
            arraylength
            if_icmple 4
         3: .line 98
            new org.bouncycastle.crypto.DataLengthException
            dup
            ldc "input buffer too short"
            invokespecial org.bouncycastle.crypto.DataLengthException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 101
      StackMap locals:
      StackMap stack:
            iload 4 /* outOff */
            bipush 8
            iadd
            aload 3 /* out */
            arraylength
            if_icmple 6
         5: .line 103
            new org.bouncycastle.crypto.OutputLengthException
            dup
            ldc "output buffer too short"
            invokespecial org.bouncycastle.crypto.OutputLengthException.<init>:(Ljava/lang/String;)V
            athrow
         6: .line 106
      StackMap locals:
      StackMap stack:
            bipush 8
            newarray 8
            astore 5 /* temp */
        start local 5 // byte[] temp
         7: .line 108
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.forEncryption:Z
            ifeq 12
         8: .line 110
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey1:[I
            aload 1 /* in */
            iload 2 /* inOff */
            aload 5 /* temp */
            iconst_0
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.desFunc:([I[BI[BI)V
         9: .line 111
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey2:[I
            aload 5 /* temp */
            iconst_0
            aload 5 /* temp */
            iconst_0
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.desFunc:([I[BI[BI)V
        10: .line 112
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey3:[I
            aload 5 /* temp */
            iconst_0
            aload 3 /* out */
            iload 4 /* outOff */
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.desFunc:([I[BI[BI)V
        11: .line 113
            goto 15
        12: .line 116
      StackMap locals: byte[]
      StackMap stack:
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey3:[I
            aload 1 /* in */
            iload 2 /* inOff */
            aload 5 /* temp */
            iconst_0
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.desFunc:([I[BI[BI)V
        13: .line 117
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey2:[I
            aload 5 /* temp */
            iconst_0
            aload 5 /* temp */
            iconst_0
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.desFunc:([I[BI[BI)V
        14: .line 118
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.engines.DESedeEngine.workingKey1:[I
            aload 5 /* temp */
            iconst_0
            aload 3 /* out */
            iload 4 /* outOff */
            invokevirtual org.bouncycastle.crypto.engines.DESedeEngine.desFunc:([I[BI[BI)V
        15: .line 121
      StackMap locals:
      StackMap stack:
            bipush 8
            ireturn
        end local 5 // byte[] temp
        end local 4 // int outOff
        end local 3 // byte[] out
        end local 2 // int inOff
        end local 1 // byte[] in
        end local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   16     0    this  Lorg/bouncycastle/crypto/engines/DESedeEngine;
            0   16     1      in  [B
            0   16     2   inOff  I
            0   16     3     out  [B
            0   16     4  outOff  I
            7   16     5    temp  [B
    MethodParameters:
        Name  Flags
      in      
      inOff   
      out     
      outOff  

  public void reset();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=1, args_size=1
        start local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
         0: .line 126
            return
        end local 0 // org.bouncycastle.crypto.engines.DESedeEngine this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/crypto/engines/DESedeEngine;
}
SourceFile: "DESedeEngine.java"