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.DERNumericString extends org.bouncycastle.asn1.ASN1Object implements org.bouncycastle.asn1.DERString
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.asn1.DERNumericString
  super_class: org.bouncycastle.asn1.ASN1Object
{
  java.lang.String string;
    descriptor: Ljava/lang/String;
    flags: (0x0000) 

  public static org.bouncycastle.asn1.DERNumericString getInstance(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lorg/bouncycastle/asn1/DERNumericString;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // java.lang.Object obj
         0: .line 22
            aload 0 /* obj */
            ifnull 1
            aload 0 /* obj */
            instanceof org.bouncycastle.asn1.DERNumericString
            ifeq 2
         1: .line 24
      StackMap locals:
      StackMap stack:
            aload 0 /* obj */
            checkcast org.bouncycastle.asn1.DERNumericString
            areturn
         2: .line 27
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "illegal object in getInstance: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* obj */
            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
        end local 0 // java.lang.Object obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0   obj  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      obj   

  public static org.bouncycastle.asn1.DERNumericString getInstance(org.bouncycastle.asn1.ASN1TaggedObject, boolean);
    descriptor: (Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/DERNumericString;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.bouncycastle.asn1.ASN1TaggedObject obj
        start local 1 // boolean explicit
         0: .line 43
            aload 0 /* obj */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getObject:()Lorg/bouncycastle/asn1/DERObject;
            astore 2 /* o */
        start local 2 // org.bouncycastle.asn1.DERObject o
         1: .line 45
            iload 1 /* explicit */
            ifne 2
            aload 2 /* o */
            instanceof org.bouncycastle.asn1.DERNumericString
            ifeq 3
         2: .line 47
      StackMap locals: org.bouncycastle.asn1.DERObject
      StackMap stack:
            aload 2 /* o */
            invokestatic org.bouncycastle.asn1.DERNumericString.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/DERNumericString;
            areturn
         3: .line 51
      StackMap locals:
      StackMap stack:
            new org.bouncycastle.asn1.DERNumericString
            dup
            aload 2 /* o */
            invokestatic org.bouncycastle.asn1.ASN1OctetString.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/ASN1OctetString;
            invokevirtual org.bouncycastle.asn1.ASN1OctetString.getOctets:()[B
            invokespecial org.bouncycastle.asn1.DERNumericString.<init>:([B)V
            areturn
        end local 2 // org.bouncycastle.asn1.DERObject o
        end local 1 // boolean explicit
        end local 0 // org.bouncycastle.asn1.ASN1TaggedObject obj
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0       obj  Lorg/bouncycastle/asn1/ASN1TaggedObject;
            0    4     1  explicit  Z
            1    4     2         o  Lorg/bouncycastle/asn1/DERObject;
    MethodParameters:
          Name  Flags
      obj       
      explicit  

  public void <init>(byte[]);
    descriptor: ([B)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=2
        start local 0 // org.bouncycastle.asn1.DERNumericString this
        start local 1 // byte[] string
         0: .line 58
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Object.<init>:()V
         1: .line 61
            aload 1 /* string */
            arraylength
            newarray 5
            astore 2 /* cs */
        start local 2 // char[] cs
         2: .line 63
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         3: goto 6
         4: .line 65
      StackMap locals: org.bouncycastle.asn1.DERNumericString byte[] char[] int
      StackMap stack:
            aload 2 /* cs */
            iload 3 /* i */
            aload 1 /* string */
            iload 3 /* i */
            baload
            sipush 255
            iand
            i2c
            castore
         5: .line 63
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         6: iload 3 /* i */
            aload 2 /* cs */
            arraylength
            if_icmpne 4
        end local 3 // int i
         7: .line 68
            aload 0 /* this */
            new java.lang.String
            dup
            aload 2 /* cs */
            invokespecial java.lang.String.<init>:([C)V
            putfield org.bouncycastle.asn1.DERNumericString.string:Ljava/lang/String;
         8: .line 69
            return
        end local 2 // char[] cs
        end local 1 // byte[] string
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    9     0    this  Lorg/bouncycastle/asn1/DERNumericString;
            0    9     1  string  [B
            2    9     2      cs  [C
            3    7     3       i  I
    MethodParameters:
        Name  Flags
      string  

  public void <init>(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.DERNumericString this
        start local 1 // java.lang.String string
         0: .line 77
            aload 0 /* this */
            aload 1 /* string */
            iconst_0
            invokespecial org.bouncycastle.asn1.DERNumericString.<init>:(Ljava/lang/String;Z)V
         1: .line 78
            return
        end local 1 // java.lang.String string
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/bouncycastle/asn1/DERNumericString;
            0    2     1  string  Ljava/lang/String;
    MethodParameters:
        Name  Flags
      string  

  public void <init>(java.lang.String, boolean);
    descriptor: (Ljava/lang/String;Z)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.bouncycastle.asn1.DERNumericString this
        start local 1 // java.lang.String string
        start local 2 // boolean validate
         0: .line 88
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Object.<init>:()V
         1: .line 92
            iload 2 /* validate */
            ifeq 3
            aload 1 /* string */
            invokestatic org.bouncycastle.asn1.DERNumericString.isNumericString:(Ljava/lang/String;)Z
            ifne 3
         2: .line 94
            new java.lang.IllegalArgumentException
            dup
            ldc "string contains illegal characters"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 97
      StackMap locals: org.bouncycastle.asn1.DERNumericString java.lang.String int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* string */
            putfield org.bouncycastle.asn1.DERNumericString.string:Ljava/lang/String;
         4: .line 98
            return
        end local 2 // boolean validate
        end local 1 // java.lang.String string
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    5     0      this  Lorg/bouncycastle/asn1/DERNumericString;
            0    5     1    string  Ljava/lang/String;
            0    5     2  validate  Z
    MethodParameters:
          Name  Flags
      string    
      validate  

  public java.lang.String getString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.DERNumericString this
         0: .line 102
            aload 0 /* this */
            getfield org.bouncycastle.asn1.DERNumericString.string:Ljava/lang/String;
            areturn
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/DERNumericString;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.DERNumericString this
         0: .line 107
            aload 0 /* this */
            getfield org.bouncycastle.asn1.DERNumericString.string:Ljava/lang/String;
            areturn
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/DERNumericString;

  public byte[] getOctets();
    descriptor: ()[B
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=1
        start local 0 // org.bouncycastle.asn1.DERNumericString this
         0: .line 112
            aload 0 /* this */
            getfield org.bouncycastle.asn1.DERNumericString.string:Ljava/lang/String;
            invokevirtual java.lang.String.toCharArray:()[C
            astore 1 /* cs */
        start local 1 // char[] cs
         1: .line 113
            aload 1 /* cs */
            arraylength
            newarray 8
            astore 2 /* bs */
        start local 2 // byte[] bs
         2: .line 115
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         3: goto 6
         4: .line 117
      StackMap locals: char[] byte[] int
      StackMap stack:
            aload 2 /* bs */
            iload 3 /* i */
            aload 1 /* cs */
            iload 3 /* i */
            caload
            i2b
            bastore
         5: .line 115
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         6: iload 3 /* i */
            aload 1 /* cs */
            arraylength
            if_icmpne 4
        end local 3 // int i
         7: .line 120
            aload 2 /* bs */
            areturn
        end local 2 // byte[] bs
        end local 1 // char[] cs
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lorg/bouncycastle/asn1/DERNumericString;
            1    8     1    cs  [C
            2    8     2    bs  [B
            3    7     3     i  I

  void encode(org.bouncycastle.asn1.DEROutputStream);
    descriptor: (Lorg/bouncycastle/asn1/DEROutputStream;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.DERNumericString this
        start local 1 // org.bouncycastle.asn1.DEROutputStream out
         0: .line 127
            aload 1 /* out */
            bipush 18
            aload 0 /* this */
            invokevirtual org.bouncycastle.asn1.DERNumericString.getOctets:()[B
            invokevirtual org.bouncycastle.asn1.DEROutputStream.writeEncoded:(I[B)V
         1: .line 128
            return
        end local 1 // org.bouncycastle.asn1.DEROutputStream out
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/bouncycastle/asn1/DERNumericString;
            0    2     1   out  Lorg/bouncycastle/asn1/DEROutputStream;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      out   

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.DERNumericString this
         0: .line 132
            aload 0 /* this */
            invokevirtual org.bouncycastle.asn1.DERNumericString.getString:()Ljava/lang/String;
            invokevirtual java.lang.String.hashCode:()I
            ireturn
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/DERNumericString;

  boolean asn1Equals(org.bouncycastle.asn1.DERObject);
    descriptor: (Lorg/bouncycastle/asn1/DERObject;)Z
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.bouncycastle.asn1.DERNumericString this
        start local 1 // org.bouncycastle.asn1.DERObject o
         0: .line 138
            aload 1 /* o */
            instanceof org.bouncycastle.asn1.DERNumericString
            ifne 2
         1: .line 140
            iconst_0
            ireturn
         2: .line 143
      StackMap locals:
      StackMap stack:
            aload 1 /* o */
            checkcast org.bouncycastle.asn1.DERNumericString
            astore 2 /* s */
        start local 2 // org.bouncycastle.asn1.DERNumericString s
         3: .line 145
            aload 0 /* this */
            invokevirtual org.bouncycastle.asn1.DERNumericString.getString:()Ljava/lang/String;
            aload 2 /* s */
            invokevirtual org.bouncycastle.asn1.DERNumericString.getString:()Ljava/lang/String;
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ireturn
        end local 2 // org.bouncycastle.asn1.DERNumericString s
        end local 1 // org.bouncycastle.asn1.DERObject o
        end local 0 // org.bouncycastle.asn1.DERNumericString this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/bouncycastle/asn1/DERNumericString;
            0    4     1     o  Lorg/bouncycastle/asn1/DERObject;
            3    4     2     s  Lorg/bouncycastle/asn1/DERNumericString;
    MethodParameters:
      Name  Flags
      o     

  public static boolean isNumericString(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=3, args_size=1
        start local 0 // java.lang.String str
         0: .line 157
            aload 0 /* str */
            invokevirtual java.lang.String.length:()I
            iconst_1
            isub
            istore 1 /* i */
        start local 1 // int i
         1: goto 10
         2: .line 159
      StackMap locals: int
      StackMap stack:
            aload 0 /* str */
            iload 1 /* i */
            invokevirtual java.lang.String.charAt:(I)C
            istore 2 /* ch */
        start local 2 // char ch
         3: .line 161
            iload 2 /* ch */
            bipush 127
            if_icmple 5
         4: .line 163
            iconst_0
            ireturn
         5: .line 166
      StackMap locals: int
      StackMap stack:
            bipush 48
            iload 2 /* ch */
            if_icmpgt 6
            iload 2 /* ch */
            bipush 57
            if_icmple 9
      StackMap locals:
      StackMap stack:
         6: iload 2 /* ch */
            bipush 32
            if_icmpne 8
         7: .line 168
            goto 9
         8: .line 171
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 2 // char ch
         9: .line 157
      StackMap locals:
      StackMap stack:
            iinc 1 /* i */ -1
      StackMap locals:
      StackMap stack:
        10: iload 1 /* i */
            ifge 2
        end local 1 // int i
        11: .line 174
            iconst_1
            ireturn
        end local 0 // java.lang.String str
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   12     0   str  Ljava/lang/String;
            1   11     1     i  I
            3    9     2    ch  C
    MethodParameters:
      Name  Flags
      str   
}
SourceFile: "DERNumericString.java"