using System; #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER using System.Buffers; #endif using System.IO; using Org.BouncyCastle.Utilities; namespace Org.BouncyCastle.Asn1 { /** * Der BMPString object. */ public class DerBmpString : DerStringBase { internal class Meta : Asn1UniversalType { internal static readonly Asn1UniversalType Instance = new Meta(); private Meta() : base(typeof(DerBmpString), Asn1Tags.BmpString) {} internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString) { return CreatePrimitive(octetString.GetOctets()); } } /** * return a BMP string from the given object. * * @param obj the object we want converted. * @exception ArgumentException if the object cannot be converted. */ public static DerBmpString GetInstance(object obj) { if (obj == null) return null; if (obj is DerBmpString derBmpString) return derBmpString; if (obj is IAsn1Convertible asn1Convertible) { if (!(obj is Asn1Object) && asn1Convertible.ToAsn1Object() is DerBmpString converted) return converted; } else if (obj is byte[] bytes) { try { return (DerBmpString)Meta.Instance.FromByteArray(bytes); } catch (IOException e) { throw new ArgumentException("failed to construct BMP string from byte[]: " + e.Message); } } throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj)); } /** * return a BMP string from a tagged object. * * @param taggedObject the tagged object holding the object we want * @param declaredExplicit true if the object is meant to be explicitly tagged false otherwise. * @exception ArgumentException if the tagged object cannot be converted. */ public static DerBmpString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit) { return (DerBmpString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit); } public static DerBmpString GetOptional(Asn1Encodable element) { if (element == null) throw new ArgumentNullException(nameof(element)); if (element is DerBmpString existing) return existing; return null; } public static DerBmpString GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit) { return (DerBmpString)Meta.Instance.GetTagged(taggedObject, declaredExplicit); } private readonly string m_str; internal DerBmpString(byte[] contents) { if (null == contents) throw new ArgumentNullException("contents"); int byteLen = contents.Length; if (0 != (byteLen & 1)) throw new ArgumentException("malformed BMPString encoding encountered", "contents"); int charLen = byteLen / 2; #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER m_str = string.Create(charLen, contents, (chars, bytes) => { for (int i = 0; i < chars.Length; ++i) { chars[i] = (char)((bytes[2 * i] << 8) | (bytes[2 * i + 1] & 0xff)); } }); #else char[] cs = new char[charLen]; for (int i = 0; i != charLen; i++) { cs[i] = (char)((contents[2 * i] << 8) | (contents[2 * i + 1] & 0xff)); } m_str = new string(cs); #endif } #if !(NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER) internal DerBmpString(char[] str) { if (str == null) throw new ArgumentNullException("str"); m_str = new string(str); } #endif /** * basic constructor */ public DerBmpString(string str) { if (str == null) throw new ArgumentNullException("str"); m_str = str; } public override string GetString() { return m_str; } protected override bool Asn1Equals(Asn1Object asn1Object) { DerBmpString that = asn1Object as DerBmpString; return null != that && this.m_str.Equals(that.m_str); } protected override int Asn1GetHashCode() { return m_str.GetHashCode(); } internal override IAsn1Encoding GetEncoding(int encoding) { return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.BmpString, GetContents()); } internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo) { return new PrimitiveEncoding(tagClass, tagNo, GetContents()); } internal sealed override DerEncoding GetEncodingDer() { return new PrimitiveDerEncoding(Asn1Tags.Universal, Asn1Tags.BmpString, GetContents()); } internal sealed override DerEncoding GetEncodingDerImplicit(int tagClass, int tagNo) { return new PrimitiveDerEncoding(tagClass, tagNo, GetContents()); } private byte[] GetContents() { char[] c = m_str.ToCharArray(); byte[] b = new byte[c.Length * 2]; for (int i = 0; i != c.Length; i++) { b[2 * i] = (byte)(c[i] >> 8); b[2 * i + 1] = (byte)c[i]; } return b; } internal static DerBmpString CreatePrimitive(byte[] contents) { return new DerBmpString(contents); } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER internal static DerBmpString CreatePrimitive(int length, TState state, SpanAction action) { return new DerBmpString(string.Create(length, state, action)); } #else internal static DerBmpString CreatePrimitive(char[] str) { // TODO[asn1] Asn1InputStream has a validator/converter that should be unified in this class somehow return new DerBmpString(str); } #endif } }