diff options
Diffstat (limited to 'crypto/src/asn1/Asn1InputStream.cs')
| -rw-r--r-- | crypto/src/asn1/Asn1InputStream.cs | 156 |
1 files changed, 72 insertions, 84 deletions
diff --git a/crypto/src/asn1/Asn1InputStream.cs b/crypto/src/asn1/Asn1InputStream.cs index ff3590122..8ce55a2b7 100644 --- a/crypto/src/asn1/Asn1InputStream.cs +++ b/crypto/src/asn1/Asn1InputStream.cs @@ -81,57 +81,54 @@ namespace Org.BouncyCastle.Asn1 { bool isConstructed = (tag & Asn1Tags.Constructed) != 0; - DefiniteLengthInputStream defIn = new DefiniteLengthInputStream(this.s, length, limit); + DefiniteLengthInputStream defIn = new DefiniteLengthInputStream(this, length, limit); - if ((tag & Asn1Tags.Application) != 0) + int tagClass = tag & Asn1Tags.Private; + if (0 != tagClass) { - return new DerApplicationSpecific(isConstructed, tagNo, defIn.ToArray()); - } + if ((tag & Asn1Tags.Application) != 0) + return new DerApplicationSpecific(isConstructed, tagNo, defIn.ToArray()); - if ((tag & Asn1Tags.Tagged) != 0) - { return new Asn1StreamParser(defIn, defIn.Remaining, tmpBuffers).ReadTaggedObject(isConstructed, tagNo); } - if (isConstructed) + if (!isConstructed) + return CreatePrimitiveDerObject(tagNo, defIn, tmpBuffers); + + // TODO There are other tags that may be constructed (e.g. BitString) + switch (tagNo) + { + case Asn1Tags.OctetString: { - // TODO There are other tags that may be constructed (e.g. BitString) - switch (tagNo) + // + // yes, people actually do this... + // + Asn1EncodableVector v = ReadVector(defIn); + Asn1OctetString[] strings = new Asn1OctetString[v.Count]; + + for (int i = 0; i != strings.Length; i++) { - case Asn1Tags.OctetString: + Asn1Encodable asn1Obj = v[i]; + if (!(asn1Obj is Asn1OctetString)) { - // - // yes, people actually do this... - // - Asn1EncodableVector v = ReadVector(defIn); - Asn1OctetString[] strings = new Asn1OctetString[v.Count]; - - for (int i = 0; i != strings.Length; i++) - { - Asn1Encodable asn1Obj = v[i]; - if (!(asn1Obj is Asn1OctetString)) - { - throw new Asn1Exception("unknown object encountered in constructed OCTET STRING: " - + Platform.GetTypeName(asn1Obj)); - } - - strings[i] = (Asn1OctetString)asn1Obj; - } - - return new BerOctetString(strings); + throw new Asn1Exception("unknown object encountered in constructed OCTET STRING: " + + Platform.GetTypeName(asn1Obj)); } - case Asn1Tags.Sequence: - return CreateDerSequence(defIn); - case Asn1Tags.Set: - return CreateDerSet(defIn); - case Asn1Tags.External: - return new DerExternal(ReadVector(defIn)); - default: - throw new IOException("unknown tag " + tagNo + " encountered"); + + strings[i] = (Asn1OctetString)asn1Obj; } - } - return CreatePrimitiveDerObject(tagNo, defIn, tmpBuffers); + return new BerOctetString(strings); + } + case Asn1Tags.Sequence: + return CreateDerSequence(defIn); + case Asn1Tags.Set: + return CreateDerSet(defIn); + case Asn1Tags.External: + return new DerExternal(ReadVector(defIn)); + default: + throw new IOException("unknown tag " + tagNo + " encountered"); + } } internal virtual Asn1EncodableVector ReadVector() @@ -181,53 +178,12 @@ namespace Org.BouncyCastle.Asn1 return null; } - // - // calculate tag number - // - int tagNo = ReadTagNumber(this.s, tag); - - bool isConstructed = (tag & Asn1Tags.Constructed) != 0; - - // - // calculate length - // - int length = ReadLength(this.s, limit, false); + int tagNo = ReadTagNumber(this, tag); + int length = ReadLength(this, limit, false); - if (length < 0) // indefinite-length method - { - if (!isConstructed) - throw new IOException("indefinite-length primitive encoding encountered"); - - IndefiniteLengthInputStream indIn = new IndefiniteLengthInputStream(this.s, limit); - Asn1StreamParser sp = new Asn1StreamParser(indIn, limit, tmpBuffers); - - if ((tag & Asn1Tags.Application) != 0) - { - return new BerApplicationSpecificParser(tagNo, sp).ToAsn1Object(); - } - - if ((tag & Asn1Tags.Tagged) != 0) - { - return new BerTaggedObjectParser(true, tagNo, sp).ToAsn1Object(); - } - - // TODO There are other tags that may be constructed (e.g. BitString) - switch (tagNo) - { - case Asn1Tags.OctetString: - return new BerOctetStringParser(sp).ToAsn1Object(); - case Asn1Tags.Sequence: - return new BerSequenceParser(sp).ToAsn1Object(); - case Asn1Tags.Set: - return new BerSetParser(sp).ToAsn1Object(); - case Asn1Tags.External: - return new DerExternalParser(sp).ToAsn1Object(); - default: - throw new IOException("unknown BER object encountered"); - } - } - else + if (length >= 0) { + // definite-length try { return BuildObject(tag, tagNo, length); @@ -237,6 +193,38 @@ namespace Org.BouncyCastle.Asn1 throw new Asn1Exception("corrupted stream detected", e); } } + + // indefinite-length + + if (0 == (tag & Asn1Tags.Constructed)) + throw new IOException("indefinite-length primitive encoding encountered"); + + IndefiniteLengthInputStream indIn = new IndefiniteLengthInputStream(this, limit); + Asn1StreamParser sp = new Asn1StreamParser(indIn, limit, tmpBuffers); + + int tagClass = tag & Asn1Tags.Private; + if (0 != tagClass) + { + if ((tag & Asn1Tags.Application) != 0) + return new BerApplicationSpecificParser(tagNo, sp).ToAsn1Object(); + + return new BerTaggedObjectParser(true, tagNo, sp).ToAsn1Object(); + } + + // TODO There are other tags that may be constructed (e.g. BitString) + switch (tagNo) + { + case Asn1Tags.OctetString: + return new BerOctetStringParser(sp).ToAsn1Object(); + case Asn1Tags.Sequence: + return new BerSequenceParser(sp).ToAsn1Object(); + case Asn1Tags.Set: + return new BerSetParser(sp).ToAsn1Object(); + case Asn1Tags.External: + return new DerExternalParser(sp).ToAsn1Object(); + default: + throw new IOException("unknown BER object encountered"); + } } internal virtual int Limit |