284 lines
8.4 KiB
C#
284 lines
8.4 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.IO;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Math;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1
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{
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public class DerInteger
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: Asn1Object
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{
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internal class Meta : Asn1UniversalType
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{
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internal static readonly Asn1UniversalType Instance = new Meta();
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private Meta() : base(typeof(DerInteger), Asn1Tags.Integer) {}
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internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
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{
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return CreatePrimitive(octetString.GetOctets());
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}
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}
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public const string AllowUnsafeProperty = "BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.AllowUnsafeInteger";
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internal static bool AllowUnsafe()
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{
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string allowUnsafeValue = Org.BouncyCastle.Utilities.Platform.GetEnvironmentVariable(AllowUnsafeProperty);
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return allowUnsafeValue != null && Org.BouncyCastle.Utilities.Platform.EqualsIgnoreCase("true", allowUnsafeValue);
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}
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internal const int SignExtSigned = -1;
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internal const int SignExtUnsigned = 0xFF;
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private readonly byte[] bytes;
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private readonly int start;
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/**
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* return an integer from the passed in object
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*
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* @exception ArgumentException if the object cannot be converted.
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*/
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public static DerInteger GetInstance(object obj)
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{
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if (obj == null)
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return null;
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if (obj is DerInteger derInteger)
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return derInteger;
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if (obj is IAsn1Convertible asn1Convertible)
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{
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Asn1Object asn1Object = asn1Convertible.ToAsn1Object();
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if (asn1Object is DerInteger converted)
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return converted;
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}
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else if (obj is byte[] bytes)
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{
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try
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{
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return (DerInteger)Meta.Instance.FromByteArray(bytes);
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}
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catch (IOException e)
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{
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throw new ArgumentException("failed to construct integer from byte[]: " + e.Message);
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}
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}
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throw new ArgumentException("illegal object in GetInstance: " + Org.BouncyCastle.Utilities.Platform.GetTypeName(obj));
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}
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/**
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* return an Integer from a tagged object.
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*
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* @param taggedObject the tagged object holding the object we want
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* @param declaredExplicit true if the object is meant to be explicitly tagged false otherwise.
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* @exception ArgumentException if the tagged object cannot be converted.
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*/
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public static DerInteger GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
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{
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return (DerInteger)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
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}
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public DerInteger(int value)
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{
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this.bytes = BigInteger.ValueOf(value).ToByteArray();
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this.start = 0;
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}
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public DerInteger(long value)
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{
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this.bytes = BigInteger.ValueOf(value).ToByteArray();
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this.start = 0;
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}
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public DerInteger(BigInteger value)
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{
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if (value == null)
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throw new ArgumentNullException("value");
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this.bytes = value.ToByteArray();
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this.start = 0;
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}
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public DerInteger(byte[] bytes)
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: this(bytes, true)
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{
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}
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internal DerInteger(byte[] bytes, bool clone)
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{
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if (IsMalformed(bytes))
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throw new ArgumentException("malformed integer", "bytes");
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this.bytes = clone ? Arrays.Clone(bytes) : bytes;
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this.start = SignBytesToSkip(bytes);
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}
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/**
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* in some cases positive values Get crammed into a space,
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* that's not quite big enough...
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*/
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public BigInteger PositiveValue
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{
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get { return new BigInteger(1, bytes); }
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}
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public BigInteger Value
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{
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get { return new BigInteger(bytes); }
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}
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public bool HasValue(int x)
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{
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return (bytes.Length - start) <= 4
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&& IntValue(bytes, start, SignExtSigned) == x;
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}
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public bool HasValue(long x)
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{
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return (bytes.Length - start) <= 8
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&& LongValue(bytes, start, SignExtSigned) == x;
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}
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public bool HasValue(BigInteger x)
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{
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return null != x
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// Fast check to avoid allocation
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&& IntValue(bytes, start, SignExtSigned) == x.IntValue
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&& Value.Equals(x);
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}
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public int IntPositiveValueExact
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{
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get
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{
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int count = bytes.Length - start;
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if (count > 4 || (count == 4 && 0 != (bytes[start] & 0x80)))
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throw new ArithmeticException("ASN.1 Integer out of positive int range");
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return IntValue(bytes, start, SignExtUnsigned);
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}
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}
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public int IntValueExact
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{
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get
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{
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int count = bytes.Length - start;
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if (count > 4)
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throw new ArithmeticException("ASN.1 Integer out of int range");
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return IntValue(bytes, start, SignExtSigned);
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}
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}
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public long LongValueExact
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{
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get
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{
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int count = bytes.Length - start;
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if (count > 8)
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throw new ArithmeticException("ASN.1 Integer out of long range");
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return LongValue(bytes, start, SignExtSigned);
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}
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}
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internal override IAsn1Encoding GetEncoding(int encoding)
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{
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return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.Integer, bytes);
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}
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internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
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{
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return new PrimitiveEncoding(tagClass, tagNo, bytes);
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}
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protected override int Asn1GetHashCode()
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{
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return Arrays.GetHashCode(bytes);
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}
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protected override bool Asn1Equals(Asn1Object asn1Object)
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{
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DerInteger other = asn1Object as DerInteger;
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if (other == null)
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return false;
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return Arrays.AreEqual(this.bytes, other.bytes);
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}
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public override string ToString()
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{
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return Value.ToString();
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}
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internal static DerInteger CreatePrimitive(byte[] contents)
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{
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return new DerInteger(contents, false);
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}
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internal static int IntValue(byte[] bytes, int start, int signExt)
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{
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int length = bytes.Length;
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int pos = System.Math.Max(start, length - 4);
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int val = (sbyte)bytes[pos] & signExt;
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while (++pos < length)
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{
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val = (val << 8) | bytes[pos];
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}
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return val;
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}
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internal static long LongValue(byte[] bytes, int start, int signExt)
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{
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int length = bytes.Length;
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int pos = System.Math.Max(start, length - 8);
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long val = (sbyte)bytes[pos] & signExt;
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while (++pos < length)
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{
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val = (val << 8) | bytes[pos];
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}
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return val;
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}
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/**
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* Apply the correct validation for an INTEGER primitive following the BER rules.
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*
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* @param bytes The raw encoding of the integer.
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* @return true if the (in)put fails this validation.
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*/
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internal static bool IsMalformed(byte[] bytes)
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{
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switch (bytes.Length)
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{
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case 0:
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return true;
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case 1:
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return false;
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default:
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return (sbyte)bytes[0] == ((sbyte)bytes[1] >> 7) && !AllowUnsafe();
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}
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}
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internal static int SignBytesToSkip(byte[] bytes)
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{
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int pos = 0, last = bytes.Length - 1;
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while (pos < last
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&& (sbyte)bytes[pos] == ((sbyte)bytes[pos + 1] >> 7))
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{
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++pos;
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}
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return pos;
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}
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}
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}
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#pragma warning restore
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#endif
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