public final class com.sun.crypto.provider.HmacSHA1KeyGenerator extends javax.crypto.KeyGeneratorSpi
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.sun.crypto.provider.HmacSHA1KeyGenerator
  super_class: javax.crypto.KeyGeneratorSpi
{
  private java.security.SecureRandom random;
    descriptor: Ljava/security/SecureRandom;
    flags: (0x0002) ACC_PRIVATE

  private int keysize;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
         0: .line 51
            aload 0 /* this */
            invokespecial javax.crypto.KeyGeneratorSpi.<init>:()V
         1: .line 45
            aload 0 /* this */
            aconst_null
            putfield com.sun.crypto.provider.HmacSHA1KeyGenerator.random:Ljava/security/SecureRandom;
         2: .line 46
            aload 0 /* this */
            bipush 64
            putfield com.sun.crypto.provider.HmacSHA1KeyGenerator.keysize:I
         3: .line 52
            return
        end local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/sun/crypto/provider/HmacSHA1KeyGenerator;

  protected void engineInit(java.security.SecureRandom);
    descriptor: (Ljava/security/SecureRandom;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
        start local 1 // java.security.SecureRandom random
         0: .line 60
            aload 0 /* this */
            aload 1 /* random */
            putfield com.sun.crypto.provider.HmacSHA1KeyGenerator.random:Ljava/security/SecureRandom;
         1: .line 61
            return
        end local 1 // java.security.SecureRandom random
        end local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lcom/sun/crypto/provider/HmacSHA1KeyGenerator;
            0    2     1  random  Ljava/security/SecureRandom;
    MethodParameters:
        Name  Flags
      random  

  protected void engineInit(java.security.spec.AlgorithmParameterSpec, java.security.SecureRandom);
    descriptor: (Ljava/security/spec/AlgorithmParameterSpec;Ljava/security/SecureRandom;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
        start local 1 // java.security.spec.AlgorithmParameterSpec params
        start local 2 // java.security.SecureRandom random
         0: .line 77
            new java.security.InvalidAlgorithmParameterException
            dup
         1: .line 78
            ldc "HMAC-SHA1 key generation does not take any parameters"
         2: .line 77
            invokespecial java.security.InvalidAlgorithmParameterException.<init>:(Ljava/lang/String;)V
            athrow
        end local 2 // java.security.SecureRandom random
        end local 1 // java.security.spec.AlgorithmParameterSpec params
        end local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/sun/crypto/provider/HmacSHA1KeyGenerator;
            0    3     1  params  Ljava/security/spec/AlgorithmParameterSpec;
            0    3     2  random  Ljava/security/SecureRandom;
    Exceptions:
      throws java.security.InvalidAlgorithmParameterException
    MethodParameters:
        Name  Flags
      params  
      random  

  protected void engineInit(int, java.security.SecureRandom);
    descriptor: (ILjava/security/SecureRandom;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
        start local 1 // int keysize
        start local 2 // java.security.SecureRandom random
         0: .line 90
            aload 0 /* this */
            iload 1 /* keysize */
            bipush 7
            iadd
            bipush 8
            idiv
            putfield com.sun.crypto.provider.HmacSHA1KeyGenerator.keysize:I
         1: .line 91
            aload 0 /* this */
            aload 2 /* random */
            invokevirtual com.sun.crypto.provider.HmacSHA1KeyGenerator.engineInit:(Ljava/security/SecureRandom;)V
         2: .line 92
            return
        end local 2 // java.security.SecureRandom random
        end local 1 // int keysize
        end local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lcom/sun/crypto/provider/HmacSHA1KeyGenerator;
            0    3     1  keysize  I
            0    3     2   random  Ljava/security/SecureRandom;
    MethodParameters:
         Name  Flags
      keysize  
      random   

  protected javax.crypto.SecretKey engineGenerateKey();
    descriptor: ()Ljavax/crypto/SecretKey;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
         0: .line 100
            aload 0 /* this */
            getfield com.sun.crypto.provider.HmacSHA1KeyGenerator.random:Ljava/security/SecureRandom;
            ifnonnull 2
         1: .line 101
            aload 0 /* this */
            invokestatic com.sun.crypto.provider.SunJCE.getRandom:()Ljava/security/SecureRandom;
            putfield com.sun.crypto.provider.HmacSHA1KeyGenerator.random:Ljava/security/SecureRandom;
         2: .line 104
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.sun.crypto.provider.HmacSHA1KeyGenerator.keysize:I
            newarray 8
            astore 1 /* keyBytes */
        start local 1 // byte[] keyBytes
         3: .line 105
            aload 0 /* this */
            getfield com.sun.crypto.provider.HmacSHA1KeyGenerator.random:Ljava/security/SecureRandom;
            aload 1 /* keyBytes */
            invokevirtual java.security.SecureRandom.nextBytes:([B)V
         4: .line 107
            new javax.crypto.spec.SecretKeySpec
            dup
            aload 1 /* keyBytes */
            ldc "HmacSHA1"
            invokespecial javax.crypto.spec.SecretKeySpec.<init>:([BLjava/lang/String;)V
            areturn
        end local 1 // byte[] keyBytes
        end local 0 // com.sun.crypto.provider.HmacSHA1KeyGenerator this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    5     0      this  Lcom/sun/crypto/provider/HmacSHA1KeyGenerator;
            3    5     1  keyBytes  [B
}
SourceFile: "HmacSHA1KeyGenerator.java"