| /* GENERATED SOURCE. DO NOT MODIFY. */ |
| package com.android.org.bouncycastle.asn1; |
| |
| import java.io.IOException; |
| |
| /** |
| * A BIT STRING with DER encoding - the first byte contains the count of padding bits included in the byte array's last byte. |
| * @hide This class is not part of the Android public SDK API |
| */ |
| public class DERBitString |
| extends ASN1BitString |
| { |
| /** |
| * return a Bit String from the passed in object |
| * |
| * @param obj a DERBitString or an object that can be converted into one. |
| * @exception IllegalArgumentException if the object cannot be converted. |
| * @return a DERBitString instance, or null. |
| */ |
| public static DERBitString getInstance( |
| Object obj) |
| { |
| if (obj == null || obj instanceof DERBitString) |
| { |
| return (DERBitString)obj; |
| } |
| if (obj instanceof DLBitString) |
| { |
| return new DERBitString(((DLBitString)obj).data, ((DLBitString)obj).padBits); |
| } |
| if (obj instanceof byte[]) |
| { |
| try |
| { |
| return (DERBitString)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 a Bit 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 DERBitString instance, or null. |
| */ |
| public static DERBitString getInstance( |
| ASN1TaggedObject obj, |
| boolean explicit) |
| { |
| ASN1Primitive o = obj.getObject(); |
| |
| if (explicit || o instanceof DERBitString) |
| { |
| return getInstance(o); |
| } |
| else |
| { |
| return fromOctetString(ASN1OctetString.getInstance(o).getOctets()); |
| } |
| } |
| |
| protected DERBitString(byte data, int padBits) |
| { |
| super(data, padBits); |
| } |
| |
| /** |
| * @param data the octets making up the bit string. |
| * @param padBits the number of extra bits at the end of the string. |
| */ |
| public DERBitString( |
| byte[] data, |
| int padBits) |
| { |
| super(data, padBits); |
| } |
| |
| @android.compat.annotation.UnsupportedAppUsage |
| public DERBitString( |
| byte[] data) |
| { |
| this(data, 0); |
| } |
| |
| public DERBitString( |
| int value) |
| { |
| super(getBytes(value), getPadBits(value)); |
| } |
| |
| public DERBitString( |
| ASN1Encodable obj) |
| throws IOException |
| { |
| super(obj.toASN1Primitive().getEncoded(ASN1Encoding.DER), 0); |
| } |
| |
| boolean isConstructed() |
| { |
| return false; |
| } |
| |
| int encodedLength() |
| { |
| return 1 + StreamUtil.calculateBodyLength(data.length + 1) + data.length + 1; |
| } |
| |
| void encode(ASN1OutputStream out, boolean withTag) throws IOException |
| { |
| int len = data.length; |
| if (0 == len |
| || 0 == padBits |
| || (data[len - 1] == (byte)(data[len - 1] & (0xFF << padBits)))) |
| { |
| out.writeEncoded(withTag, BERTags.BIT_STRING, (byte)padBits, data); |
| } |
| else |
| { |
| byte der = (byte)(data[len - 1] & (0xFF << padBits)); |
| out.writeEncoded(withTag, BERTags.BIT_STRING, (byte)padBits, data, 0, len - 1, der); |
| } |
| } |
| |
| ASN1Primitive toDERObject() |
| { |
| return this; |
| } |
| |
| ASN1Primitive toDLObject() |
| { |
| return this; |
| } |
| |
| static DERBitString fromOctetString(byte[] bytes) |
| { |
| if (bytes.length < 1) |
| { |
| throw new IllegalArgumentException("truncated BIT STRING detected"); |
| } |
| |
| int padBits = bytes[0]; |
| byte[] data = new byte[bytes.length - 1]; |
| |
| if (data.length != 0) |
| { |
| System.arraycopy(bytes, 1, data, 0, bytes.length - 1); |
| } |
| |
| return new DERBitString(data, padBits); |
| } |
| } |