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.cert.crmf.bc.BcFixedLengthMGF1Padder implements org.bouncycastle.cert.crmf.EncryptedValuePadder
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder
  super_class: java.lang.Object
{
  private int length;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  private java.security.SecureRandom random;
    descriptor: Ljava/security/SecureRandom;
    flags: (0x0002) ACC_PRIVATE

  private org.bouncycastle.crypto.Digest dig;
    descriptor: Lorg/bouncycastle/crypto/Digest;
    flags: (0x0002) ACC_PRIVATE

  public void <init>(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
        start local 1 // int length
         0: .line 29
            aload 0 /* this */
            iload 1 /* length */
            aconst_null
            invokespecial org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.<init>:(ILjava/security/SecureRandom;)V
         1: .line 30
            return
        end local 1 // int length
        end local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/bouncycastle/cert/crmf/bc/BcFixedLengthMGF1Padder;
            0    2     1  length  I
    MethodParameters:
        Name  Flags
      length  

  public void <init>(int, java.security.SecureRandom);
    descriptor: (ILjava/security/SecureRandom;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
        start local 1 // int length
        start local 2 // java.security.SecureRandom random
         0: .line 40
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 19
            aload 0 /* this */
            new org.bouncycastle.crypto.digests.SHA1Digest
            dup
            invokespecial org.bouncycastle.crypto.digests.SHA1Digest.<init>:()V
            putfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.dig:Lorg/bouncycastle/crypto/Digest;
         2: .line 42
            aload 0 /* this */
            iload 1 /* length */
            putfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.length:I
         3: .line 43
            aload 0 /* this */
            aload 2 /* random */
            putfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.random:Ljava/security/SecureRandom;
         4: .line 44
            return
        end local 2 // java.security.SecureRandom random
        end local 1 // int length
        end local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    5     0    this  Lorg/bouncycastle/cert/crmf/bc/BcFixedLengthMGF1Padder;
            0    5     1  length  I
            0    5     2  random  Ljava/security/SecureRandom;
    MethodParameters:
        Name  Flags
      length  
      random  

  public byte[] getPaddedData(byte[]);
    descriptor: ([B)[B
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=7, args_size=2
        start local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
        start local 1 // byte[] data
         0: .line 48
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.length:I
            newarray 8
            astore 2 /* bytes */
        start local 2 // byte[] bytes
         1: .line 49
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.dig:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            newarray 8
            astore 3 /* seed */
        start local 3 // byte[] seed
         2: .line 50
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.length:I
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.dig:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            isub
            newarray 8
            astore 4 /* mask */
        start local 4 // byte[] mask
         3: .line 52
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.random:Ljava/security/SecureRandom;
            ifnonnull 5
         4: .line 54
            aload 0 /* this */
            new java.security.SecureRandom
            dup
            invokespecial java.security.SecureRandom.<init>:()V
            putfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.random:Ljava/security/SecureRandom;
         5: .line 57
      StackMap locals: byte[] byte[] byte[]
      StackMap stack:
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.random:Ljava/security/SecureRandom;
            aload 3 /* seed */
            invokevirtual java.security.SecureRandom.nextBytes:([B)V
         6: .line 59
            new org.bouncycastle.crypto.generators.MGF1BytesGenerator
            dup
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.dig:Lorg/bouncycastle/crypto/Digest;
            invokespecial org.bouncycastle.crypto.generators.MGF1BytesGenerator.<init>:(Lorg/bouncycastle/crypto/Digest;)V
            astore 5 /* maskGen */
        start local 5 // org.bouncycastle.crypto.generators.MGF1BytesGenerator maskGen
         7: .line 61
            aload 5 /* maskGen */
            new org.bouncycastle.crypto.params.MGFParameters
            dup
            aload 3 /* seed */
            invokespecial org.bouncycastle.crypto.params.MGFParameters.<init>:([B)V
            invokevirtual org.bouncycastle.crypto.generators.MGF1BytesGenerator.init:(Lorg/bouncycastle/crypto/DerivationParameters;)V
         8: .line 63
            aload 5 /* maskGen */
            aload 4 /* mask */
            iconst_0
            aload 4 /* mask */
            arraylength
            invokevirtual org.bouncycastle.crypto.generators.MGF1BytesGenerator.generateBytes:([BII)I
            pop
         9: .line 65
            aload 3 /* seed */
            iconst_0
            aload 2 /* bytes */
            iconst_0
            aload 3 /* seed */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        10: .line 66
            aload 1 /* data */
            iconst_0
            aload 2 /* bytes */
            aload 3 /* seed */
            arraylength
            aload 1 /* data */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        11: .line 68
            aload 3 /* seed */
            arraylength
            aload 1 /* data */
            arraylength
            iadd
            iconst_1
            iadd
            istore 6 /* i */
        start local 6 // int i
        12: goto 15
        13: .line 70
      StackMap locals: org.bouncycastle.crypto.generators.MGF1BytesGenerator int
      StackMap stack:
            aload 2 /* bytes */
            iload 6 /* i */
            iconst_1
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.random:Ljava/security/SecureRandom;
            sipush 255
            invokevirtual java.security.SecureRandom.nextInt:(I)I
            iadd
            i2b
            bastore
        14: .line 68
            iinc 6 /* i */ 1
      StackMap locals:
      StackMap stack:
        15: iload 6 /* i */
            aload 2 /* bytes */
            arraylength
            if_icmpne 13
        end local 6 // int i
        16: .line 73
            iconst_0
            istore 6 /* i */
        start local 6 // int i
        17: goto 20
        18: .line 75
      StackMap locals:
      StackMap stack:
            aload 2 /* bytes */
            iload 6 /* i */
            aload 3 /* seed */
            arraylength
            iadd
            dup2
            baload
            aload 4 /* mask */
            iload 6 /* i */
            baload
            ixor
            i2b
            bastore
        19: .line 73
            iinc 6 /* i */ 1
      StackMap locals:
      StackMap stack:
        20: iload 6 /* i */
            aload 4 /* mask */
            arraylength
            if_icmpne 18
        end local 6 // int i
        21: .line 78
            aload 2 /* bytes */
            areturn
        end local 5 // org.bouncycastle.crypto.generators.MGF1BytesGenerator maskGen
        end local 4 // byte[] mask
        end local 3 // byte[] seed
        end local 2 // byte[] bytes
        end local 1 // byte[] data
        end local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   22     0     this  Lorg/bouncycastle/cert/crmf/bc/BcFixedLengthMGF1Padder;
            0   22     1     data  [B
            1   22     2    bytes  [B
            2   22     3     seed  [B
            3   22     4     mask  [B
            7   22     5  maskGen  Lorg/bouncycastle/crypto/generators/MGF1BytesGenerator;
           12   16     6        i  I
           17   21     6        i  I
    MethodParameters:
      Name  Flags
      data  

  public byte[] getUnpaddedData(byte[]);
    descriptor: ([B)[B
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=7, args_size=2
        start local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
        start local 1 // byte[] paddedData
         0: .line 83
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.dig:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            newarray 8
            astore 2 /* seed */
        start local 2 // byte[] seed
         1: .line 84
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.length:I
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.dig:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            isub
            newarray 8
            astore 3 /* mask */
        start local 3 // byte[] mask
         2: .line 86
            aload 1 /* paddedData */
            iconst_0
            aload 2 /* seed */
            iconst_0
            aload 2 /* seed */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         3: .line 88
            new org.bouncycastle.crypto.generators.MGF1BytesGenerator
            dup
            aload 0 /* this */
            getfield org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder.dig:Lorg/bouncycastle/crypto/Digest;
            invokespecial org.bouncycastle.crypto.generators.MGF1BytesGenerator.<init>:(Lorg/bouncycastle/crypto/Digest;)V
            astore 4 /* maskGen */
        start local 4 // org.bouncycastle.crypto.generators.MGF1BytesGenerator maskGen
         4: .line 90
            aload 4 /* maskGen */
            new org.bouncycastle.crypto.params.MGFParameters
            dup
            aload 2 /* seed */
            invokespecial org.bouncycastle.crypto.params.MGFParameters.<init>:([B)V
            invokevirtual org.bouncycastle.crypto.generators.MGF1BytesGenerator.init:(Lorg/bouncycastle/crypto/DerivationParameters;)V
         5: .line 92
            aload 4 /* maskGen */
            aload 3 /* mask */
            iconst_0
            aload 3 /* mask */
            arraylength
            invokevirtual org.bouncycastle.crypto.generators.MGF1BytesGenerator.generateBytes:([BII)I
            pop
         6: .line 94
            iconst_0
            istore 5 /* i */
        start local 5 // int i
         7: goto 10
         8: .line 96
      StackMap locals: org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder byte[] byte[] byte[] org.bouncycastle.crypto.generators.MGF1BytesGenerator int
      StackMap stack:
            aload 1 /* paddedData */
            iload 5 /* i */
            aload 2 /* seed */
            arraylength
            iadd
            dup2
            baload
            aload 3 /* mask */
            iload 5 /* i */
            baload
            ixor
            i2b
            bastore
         9: .line 94
            iinc 5 /* i */ 1
      StackMap locals:
      StackMap stack:
        10: iload 5 /* i */
            aload 3 /* mask */
            arraylength
            if_icmpne 8
        end local 5 // int i
        11: .line 99
            iconst_0
            istore 5 /* end */
        start local 5 // int end
        12: .line 101
            aload 1 /* paddedData */
            arraylength
            iconst_1
            isub
            istore 6 /* i */
        start local 6 // int i
        13: goto 18
        14: .line 103
      StackMap locals: int
      StackMap stack:
            aload 1 /* paddedData */
            iload 6 /* i */
            baload
            ifne 17
        15: .line 105
            iload 6 /* i */
            istore 5 /* end */
        16: .line 106
            goto 19
        17: .line 101
      StackMap locals:
      StackMap stack:
            iinc 6 /* i */ -1
      StackMap locals:
      StackMap stack:
        18: iload 6 /* i */
            aload 2 /* seed */
            arraylength
            if_icmpne 14
        end local 6 // int i
        19: .line 110
      StackMap locals:
      StackMap stack:
            iload 5 /* end */
            ifne 21
        20: .line 112
            new java.lang.IllegalStateException
            dup
            ldc "bad padding in encoding"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
        21: .line 115
      StackMap locals:
      StackMap stack:
            iload 5 /* end */
            aload 2 /* seed */
            arraylength
            isub
            newarray 8
            astore 6 /* data */
        start local 6 // byte[] data
        22: .line 117
            aload 1 /* paddedData */
            aload 2 /* seed */
            arraylength
            aload 6 /* data */
            iconst_0
            aload 6 /* data */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        23: .line 119
            aload 6 /* data */
            areturn
        end local 6 // byte[] data
        end local 5 // int end
        end local 4 // org.bouncycastle.crypto.generators.MGF1BytesGenerator maskGen
        end local 3 // byte[] mask
        end local 2 // byte[] seed
        end local 1 // byte[] paddedData
        end local 0 // org.bouncycastle.cert.crmf.bc.BcFixedLengthMGF1Padder this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   24     0        this  Lorg/bouncycastle/cert/crmf/bc/BcFixedLengthMGF1Padder;
            0   24     1  paddedData  [B
            1   24     2        seed  [B
            2   24     3        mask  [B
            4   24     4     maskGen  Lorg/bouncycastle/crypto/generators/MGF1BytesGenerator;
            7   11     5           i  I
           12   24     5         end  I
           13   19     6           i  I
           22   24     6        data  [B
    MethodParameters:
            Name  Flags
      paddedData  
}
SourceFile: "BcFixedLengthMGF1Padder.java"