| package org.bouncycastle.asn1; |
| |
| import java.io.IOException; |
| |
| import org.bouncycastle.util.Arrays; |
| import org.bouncycastle.util.Strings; |
| |
| /** |
| * DER NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }. |
| * ASN.1 NUMERIC-STRING object. |
| * <p> |
| * This is an ASCII string of characters {0,1,2,3,4,5,6,7,8,9} + space. |
| * <p> |
| * See X.680 section 37.2. |
| * <p> |
| * Explicit character set escape sequences are not allowed. |
| */ |
| public class DERNumericString |
| extends ASN1Primitive |
| implements ASN1String |
| { |
| private final byte[] string; |
| |
| /** |
| * Return a Numeric string from the passed in object |
| * |
| * @param obj a DERNumericString or an object that can be converted into one. |
| * @exception IllegalArgumentException if the object cannot be converted. |
| * @return a DERNumericString instance, or null |
| */ |
| public static DERNumericString getInstance( |
| Object obj) |
| { |
| if (obj == null || obj instanceof DERNumericString) |
| { |
| return (DERNumericString)obj; |
| } |
| |
| if (obj instanceof byte[]) |
| { |
| try |
| { |
| return (DERNumericString)fromByteArray((byte[])obj); |
| } |
| catch (Exception e) |
| { |
| throw new IllegalArgumentException("encoding error in getInstance: " + e.toString()); |
| } |
| } |
| |
| throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); |
| } |
| |
| /** |
| * Return an Numeric String from a tagged object. |
| * |
| * @param obj the tagged object holding the object we want |
| * @param explicit true if the object is meant to be explicitly |
| * tagged false otherwise. |
| * @exception IllegalArgumentException if the tagged object cannot |
| * be converted. |
| * @return a DERNumericString instance, or null. |
| */ |
| public static DERNumericString getInstance( |
| ASN1TaggedObject obj, |
| boolean explicit) |
| { |
| ASN1Primitive o = obj.getObject(); |
| |
| if (explicit || o instanceof DERNumericString) |
| { |
| return getInstance(o); |
| } |
| else |
| { |
| return new DERNumericString(ASN1OctetString.getInstance(o).getOctets()); |
| } |
| } |
| |
| /** |
| * Basic constructor - with bytes. |
| */ |
| DERNumericString( |
| byte[] string) |
| { |
| this.string = string; |
| } |
| |
| /** |
| * Basic constructor - without validation.. |
| */ |
| public DERNumericString( |
| String string) |
| { |
| this(string, false); |
| } |
| |
| /** |
| * Constructor with optional validation. |
| * |
| * @param string the base string to wrap. |
| * @param validate whether or not to check the string. |
| * @throws IllegalArgumentException if validate is true and the string |
| * contains characters that should not be in a NumericString. |
| */ |
| public DERNumericString( |
| String string, |
| boolean validate) |
| { |
| if (validate && !isNumericString(string)) |
| { |
| throw new IllegalArgumentException("string contains illegal characters"); |
| } |
| |
| this.string = Strings.toByteArray(string); |
| } |
| |
| public String getString() |
| { |
| return Strings.fromByteArray(string); |
| } |
| |
| public String toString() |
| { |
| return getString(); |
| } |
| |
| public byte[] getOctets() |
| { |
| return Arrays.clone(string); |
| } |
| |
| boolean isConstructed() |
| { |
| return false; |
| } |
| |
| int encodedLength() |
| { |
| return 1 + StreamUtil.calculateBodyLength(string.length) + string.length; |
| } |
| |
| void encode( |
| ASN1OutputStream out) |
| throws IOException |
| { |
| out.writeEncoded(BERTags.NUMERIC_STRING, string); |
| } |
| |
| public int hashCode() |
| { |
| return Arrays.hashCode(string); |
| } |
| |
| boolean asn1Equals( |
| ASN1Primitive o) |
| { |
| if (!(o instanceof DERNumericString)) |
| { |
| return false; |
| } |
| |
| DERNumericString s = (DERNumericString)o; |
| |
| return Arrays.areEqual(string, s.string); |
| } |
| |
| /** |
| * Return true if the string can be represented as a NumericString ('0'..'9', ' ') |
| * |
| * @param str string to validate. |
| * @return true if numeric, fale otherwise. |
| */ |
| public static boolean isNumericString( |
| String str) |
| { |
| for (int i = str.length() - 1; i >= 0; i--) |
| { |
| char ch = str.charAt(i); |
| |
| if (ch > 0x007f) |
| { |
| return false; |
| } |
| |
| if (('0' <= ch && ch <= '9') || ch == ' ') |
| { |
| continue; |
| } |
| |
| return false; |
| } |
| |
| return true; |
| } |
| } |