public static void TagMustBeCorrect_Custom(PublicEncodingRules ruleSet)
{
byte[] inputData = { 0x87, 2, 2, 4 };
AsnReader reader = new AsnReader(inputData, (AsnEncodingRules)ruleSet);
AssertExtensions.Throws <ArgumentException>(
"expectedTag",
() => reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(Asn1Tag.Null));
Assert.True(reader.HasData, "HasData after bad universal tag");
Assert.Throws <CryptographicException>(
() => reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>());
Assert.True(reader.HasData, "HasData after default tag");
Assert.Throws <CryptographicException>(
() => reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(new Asn1Tag(TagClass.Application, 0)));
Assert.True(reader.HasData, "HasData after wrong custom class");
Assert.Throws <CryptographicException>(
() => reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(new Asn1Tag(TagClass.ContextSpecific, 1)));
Assert.True(reader.HasData, "HasData after wrong custom tag value");
Assert.Equal(
X509KeyUsageCSharpStyle.KeyCertSign,
reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(new Asn1Tag(TagClass.ContextSpecific, 7)));
Assert.False(reader.HasData, "HasData after reading value");
}
public static void VerifyGenericReadNamedBitList(PublicEncodingRules ruleSet)
{
string inputHex = "0306078000000080" + "0309010000000080000002";
AsnReader reader = new AsnReader(inputHex.HexToByteArray(), (AsnEncodingRules)ruleSet);
ULongFlags uLongFlags = reader.GetNamedBitListValue <ULongFlags>();
LongFlags longFlags = reader.GetNamedBitListValue <LongFlags>();
Assert.False(reader.HasData);
Assert.Equal(ULongFlags.Mid | ULongFlags.Min, uLongFlags);
Assert.Equal(LongFlags.Mid | LongFlags.Max, longFlags);
}
public static void ExpectedTag_IgnoresConstructed(
PublicEncodingRules ruleSet,
string inputHex,
PublicTagClass tagClass,
int tagValue)
{
byte[] inputData = inputHex.HexToByteArray();
AsnReader reader = new AsnReader(inputData, (AsnEncodingRules)ruleSet);
Assert.Equal(
X509KeyUsageCSharpStyle.DecipherOnly,
reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(
new Asn1Tag((TagClass)tagClass, tagValue, true)));
Assert.False(reader.HasData);
reader = new AsnReader(inputData, (AsnEncodingRules)ruleSet);
Assert.Equal(
X509KeyUsageCSharpStyle.DecipherOnly,
reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(
new Asn1Tag((TagClass)tagClass, tagValue, false)));
Assert.False(reader.HasData);
}
public virtual void DecodeX509KeyUsageExtension(byte[] encoded, out X509KeyUsageFlags keyUsages)
{
AsnReader reader = new AsnReader(encoded, AsnEncodingRules.BER);
KeyUsageFlagsAsn keyUsagesAsn = reader.GetNamedBitListValue <KeyUsageFlagsAsn>();
reader.ThrowIfNotEmpty();
// DER encodings of BIT_STRING values number the bits as
// 01234567 89 (big endian), plus a number saying how many bits of the last byte were padding.
//
// So digitalSignature (0) doesn't mean 2^0 (0x01), it means the most significant bit
// is set in this byte stream.
//
// BIT_STRING values are compact. So a value of cRLSign (6) | keyEncipherment (2), which
// is 0b0010001 => 0b0010 0010 (1 bit padding) => 0x22 encoded is therefore
// 0x02 (length remaining) 0x01 (1 bit padding) 0x22.
//
// We will read that, and return 0x22. 0x22 lines up
// exactly with X509KeyUsageFlags.CrlSign (0x20) | X509KeyUsageFlags.KeyEncipherment (0x02)
//
// Once the decipherOnly (8) bit is added to the mix, the values become:
// 0b001000101 => 0b0010 0010 1000 0000 (7 bits padding)
// { 0x03 0x07 0x22 0x80 }
// And we read new byte[] { 0x22 0x80 }
//
// The value of X509KeyUsageFlags.DecipherOnly is 0x8000. 0x8000 in a little endian
// representation is { 0x00 0x80 }. This means that the DER storage mechanism has effectively
// ended up being little-endian for BIT_STRING values. Untwist the bytes, and now the bits all
// line up with the existing X509KeyUsageFlags.
keyUsages =
(X509KeyUsageFlags)ReverseBitOrder((byte)keyUsagesAsn) |
(X509KeyUsageFlags)(ReverseBitOrder((byte)(((ushort)keyUsagesAsn >> 8))) << 8);
}
internal static void Decode(AsnReader reader, Asn1Tag expectedTag, out PkiStatusInfo decoded)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = default;
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
if (!sequenceReader.TryReadInt32(out decoded.Status))
{
sequenceReader.ThrowIfNotEmpty();
}
if (sequenceReader.HasData)
{
decoded.StatusString = sequenceReader.GetEncodedValue();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(Asn1Tag.PrimitiveBitString))
{
decoded.FailInfo = sequenceReader.GetNamedBitListValue <System.Security.Cryptography.Pkcs.Asn1.PkiFailureInfo>();
}
sequenceReader.ThrowIfNotEmpty();
}
public static void ReadNamedBitList_ExcessiveBits(PublicEncodingRules ruleSet)
{
string inputHex = "0303061480";
AsnReader reader = new AsnReader(inputHex.HexToByteArray(), (AsnEncodingRules)ruleSet);
Assert.Throws <CryptographicException>(
() => reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>());
Assert.True(reader.HasData, "reader.HasData");
}
public static void ReadNamedBitList_RequiresFlags(PublicEncodingRules ruleSet)
{
string inputHex = "030100";
AsnReader reader = new AsnReader(inputHex.HexToByteArray(), (AsnEncodingRules)ruleSet);
AssertExtensions.Throws <ArgumentException>(
"tFlagsEnum",
() => reader.GetNamedBitListValue <AsnEncodingRules>());
Assert.True(reader.HasData, "reader.HasData");
}
public static void TagMustBeCorrect_Universal(PublicEncodingRules ruleSet)
{
byte[] inputData = { 3, 2, 1, 2 };
AsnReader reader = new AsnReader(inputData, (AsnEncodingRules)ruleSet);
AssertExtensions.Throws <ArgumentException>(
"expectedTag",
() => reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(Asn1Tag.Null));
Assert.True(reader.HasData, "HasData after bad universal tag");
Assert.Throws <CryptographicException>(
() => reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>(new Asn1Tag(TagClass.ContextSpecific, 0)));
Assert.True(reader.HasData, "HasData after wrong tag");
Assert.Equal(
X509KeyUsageCSharpStyle.CrlSign,
reader.GetNamedBitListValue <X509KeyUsageCSharpStyle>());
Assert.False(reader.HasData, "HasData after read");
}
public static void VerifyReadNamedBitListEncodings(
PublicEncodingRules ruleSet,
Type enumType,
long enumValue,
string inputHex)
{
byte[] inputBytes = inputHex.HexToByteArray();
AsnReader reader = new AsnReader(inputBytes, (AsnEncodingRules)ruleSet);
Enum readValue = reader.GetNamedBitListValue(enumType);
Assert.Equal(Enum.ToObject(enumType, enumValue), readValue);
}
internal static void Decode(AsnReader reader, Asn1Tag expectedTag, out DistributionPointAsn decoded)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = default;
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
AsnReader explicitReader;
AsnReader collectionReader;
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 0)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 0));
System.Security.Cryptography.X509Certificates.Asn1.DistributionPointNameAsn tmpDistributionPoint;
System.Security.Cryptography.X509Certificates.Asn1.DistributionPointNameAsn.Decode(explicitReader, out tmpDistributionPoint);
decoded.DistributionPoint = tmpDistributionPoint;
explicitReader.ThrowIfNotEmpty();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 1)))
{
decoded.Reasons = sequenceReader.GetNamedBitListValue <System.Security.Cryptography.X509Certificates.Asn1.ReasonFlagsAsn>(new Asn1Tag(TagClass.ContextSpecific, 1));
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 2)))
{
// Decode SEQUENCE OF for CRLIssuer
{
collectionReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 2));
var tmpList = new List <System.Security.Cryptography.Asn1.GeneralNameAsn>();
System.Security.Cryptography.Asn1.GeneralNameAsn tmpItem;
while (collectionReader.HasData)
{
System.Security.Cryptography.Asn1.GeneralNameAsn.Decode(collectionReader, out tmpItem);
tmpList.Add(tmpItem);
}
decoded.CRLIssuer = tmpList.ToArray();
}
}
sequenceReader.ThrowIfNotEmpty();
}
public static void ReadMicrosoftComCert()
{
byte[] bytes = MicrosoftDotComSslCertBytes;
AsnReader fileReader = new AsnReader(bytes, AsnEncodingRules.DER);
AsnReader certReader = fileReader.ReadSequence();
Assert.False(fileReader.HasData, "fileReader.HasData");
AsnReader tbsCertReader = certReader.ReadSequence();
AsnReader sigAlgReader = certReader.ReadSequence();
Assert.True(
certReader.TryGetPrimitiveBitStringValue(
out int unusedBitCount,
out ReadOnlyMemory <byte> signature),
"certReader.TryGetBitStringBytes");
Assert.Equal(0, unusedBitCount);
AssertRefSame(signature, ref bytes[1176], "Signature is a ref to bytes[1176]");
Assert.False(certReader.HasData, "certReader.HasData");
AsnReader versionExplicitWrapper = tbsCertReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 0));
Assert.True(versionExplicitWrapper.TryReadInt32(out int certVersion));
Assert.Equal(2, certVersion);
Assert.False(versionExplicitWrapper.HasData, "versionExplicitWrapper.HasData");
ReadOnlyMemory <byte> serialBytes = tbsCertReader.GetIntegerBytes();
AssertRefSame(serialBytes, ref bytes[15], "Serial number starts at bytes[15]");
AsnReader tbsSigAlgReader = tbsCertReader.ReadSequence();
Assert.Equal("1.2.840.113549.1.1.11", tbsSigAlgReader.ReadObjectIdentifierAsString());
Assert.True(tbsSigAlgReader.HasData, "tbsSigAlgReader.HasData before ReadNull");
tbsSigAlgReader.ReadNull();
Assert.False(tbsSigAlgReader.HasData, "tbsSigAlgReader.HasData after ReadNull");
AsnReader issuerReader = tbsCertReader.ReadSequence();
Asn1Tag printableString = new Asn1Tag(UniversalTagNumber.PrintableString);
AssertRdn(issuerReader, "2.5.4.6", 57, printableString, bytes, "issuer[C]");
AssertRdn(issuerReader, "2.5.4.10", 70, printableString, bytes, "issuer[O]");
AssertRdn(issuerReader, "2.5.4.11", 101, printableString, bytes, "issuer[OU]");
AssertRdn(issuerReader, "2.5.4.3", 134, printableString, bytes, "issuer[CN]");
Assert.False(issuerReader.HasData, "issuerReader.HasData");
AsnReader validityReader = tbsCertReader.ReadSequence();
Assert.Equal(new DateTimeOffset(2014, 10, 15, 0, 0, 0, TimeSpan.Zero), validityReader.GetUtcTime());
Assert.Equal(new DateTimeOffset(2016, 10, 15, 23, 59, 59, TimeSpan.Zero), validityReader.GetUtcTime());
Assert.False(validityReader.HasData, "validityReader.HasData");
AsnReader subjectReader = tbsCertReader.ReadSequence();
Asn1Tag utf8String = new Asn1Tag(UniversalTagNumber.UTF8String);
AssertRdn(subjectReader, "1.3.6.1.4.1.311.60.2.1.3", 220, printableString, bytes, "subject[EV Country]");
AssertRdn(subjectReader, "1.3.6.1.4.1.311.60.2.1.2", 241, utf8String, bytes, "subject[EV State]", "Washington");
AssertRdn(subjectReader, "2.5.4.15", 262, printableString, bytes, "subject[Business Category]");
AssertRdn(subjectReader, "2.5.4.5", 293, printableString, bytes, "subject[Serial Number]");
AssertRdn(subjectReader, "2.5.4.6", 313, printableString, bytes, "subject[C]");
AssertRdn(subjectReader, "2.5.4.17", 326, utf8String, bytes, "subject[Postal Code]", "98052");
AssertRdn(subjectReader, "2.5.4.8", 342, utf8String, bytes, "subject[ST]", "Washington");
AssertRdn(subjectReader, "2.5.4.7", 363, utf8String, bytes, "subject[L]", "Redmond");
AssertRdn(subjectReader, "2.5.4.9", 381, utf8String, bytes, "subject[Street Address]", "1 Microsoft Way");
AssertRdn(subjectReader, "2.5.4.10", 407, utf8String, bytes, "subject[O]", "Microsoft Corporation");
AssertRdn(subjectReader, "2.5.4.11", 439, utf8String, bytes, "subject[OU]", "MSCOM");
AssertRdn(subjectReader, "2.5.4.3", 455, utf8String, bytes, "subject[CN]", "www.microsoft.com");
Assert.False(subjectReader.HasData, "subjectReader.HasData");
AsnReader subjectPublicKeyInfo = tbsCertReader.ReadSequence();
AsnReader spkiAlgorithm = subjectPublicKeyInfo.ReadSequence();
Assert.Equal("1.2.840.113549.1.1.1", spkiAlgorithm.ReadObjectIdentifierAsString());
spkiAlgorithm.ReadNull();
Assert.False(spkiAlgorithm.HasData, "spkiAlgorithm.HasData");
Assert.True(
subjectPublicKeyInfo.TryGetPrimitiveBitStringValue(
out unusedBitCount,
out ReadOnlyMemory <byte> encodedPublicKey),
"subjectPublicKeyInfo.TryGetBitStringBytes");
Assert.Equal(0, unusedBitCount);
AssertRefSame(encodedPublicKey, ref bytes[498], "Encoded public key starts at byte 498");
Assert.False(subjectPublicKeyInfo.HasData, "subjectPublicKeyInfo.HasData");
AsnReader publicKeyReader = new AsnReader(encodedPublicKey, AsnEncodingRules.DER);
AsnReader rsaPublicKeyReader = publicKeyReader.ReadSequence();
AssertRefSame(rsaPublicKeyReader.GetIntegerBytes(), ref bytes[506], "RSA Modulus is at bytes[502]");
Assert.True(rsaPublicKeyReader.TryReadInt32(out int rsaExponent));
Assert.Equal(65537, rsaExponent);
Assert.False(rsaPublicKeyReader.HasData, "rsaPublicKeyReader.HasData");
Assert.False(publicKeyReader.HasData, "publicKeyReader.HasData");
AsnReader extensionsContainer = tbsCertReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 3));
AsnReader extensions = extensionsContainer.ReadSequence();
Assert.False(extensionsContainer.HasData, "extensionsContainer.HasData");
AsnReader sanExtension = extensions.ReadSequence();
Assert.Equal("2.5.29.17", sanExtension.ReadObjectIdentifierAsString());
Assert.True(sanExtension.TryGetPrimitiveOctetStringBytes(out ReadOnlyMemory <byte> sanExtensionBytes));
Assert.False(sanExtension.HasData, "sanExtension.HasData");
AsnReader sanExtensionPayload = new AsnReader(sanExtensionBytes, AsnEncodingRules.DER);
AsnReader sanExtensionValue = sanExtensionPayload.ReadSequence();
Assert.False(sanExtensionPayload.HasData, "sanExtensionPayload.HasData");
Asn1Tag dnsName = new Asn1Tag(TagClass.ContextSpecific, 2);
Assert.Equal("www.microsoft.com", sanExtensionValue.GetCharacterString(dnsName, UniversalTagNumber.IA5String));
Assert.Equal("wwwqa.microsoft.com", sanExtensionValue.GetCharacterString(dnsName, UniversalTagNumber.IA5String));
Assert.False(sanExtensionValue.HasData, "sanExtensionValue.HasData");
AsnReader basicConstraints = extensions.ReadSequence();
Assert.Equal("2.5.29.19", basicConstraints.ReadObjectIdentifierAsString());
Assert.True(basicConstraints.TryGetPrimitiveOctetStringBytes(out ReadOnlyMemory <byte> basicConstraintsBytes));
AsnReader basicConstraintsPayload = new AsnReader(basicConstraintsBytes, AsnEncodingRules.DER);
AsnReader basicConstraintsValue = basicConstraintsPayload.ReadSequence();
Assert.False(basicConstraintsValue.HasData, "basicConstraintsValue.HasData");
Assert.False(basicConstraintsPayload.HasData, "basicConstraintsPayload.HasData");
AsnReader keyUsageExtension = extensions.ReadSequence();
Assert.Equal("2.5.29.15", keyUsageExtension.ReadObjectIdentifierAsString());
Assert.True(keyUsageExtension.ReadBoolean(), "keyUsageExtension.ReadBoolean() (IsCritical)");
Assert.True(keyUsageExtension.TryGetPrimitiveOctetStringBytes(out ReadOnlyMemory <byte> keyUsageBytes));
AsnReader keyUsagePayload = new AsnReader(keyUsageBytes, AsnEncodingRules.DER);
Assert.Equal(
X509KeyUsageCSharpStyle.DigitalSignature | X509KeyUsageCSharpStyle.KeyEncipherment,
keyUsagePayload.GetNamedBitListValue <X509KeyUsageCSharpStyle>());
Assert.False(keyUsagePayload.HasData, "keyUsagePayload.HasData");
AssertExtension(extensions, "2.5.29.37", false, 863, bytes);
AssertExtension(extensions, "2.5.29.32", false, 894, bytes);
AssertExtension(extensions, "2.5.29.35", false, 998, bytes);
AssertExtension(extensions, "2.5.29.31", false, 1031, bytes);
AssertExtension(extensions, "1.3.6.1.5.5.7.1.1", false, 1081, bytes);
Assert.False(extensions.HasData, "extensions.HasData");
Assert.Equal("1.2.840.113549.1.1.11", sigAlgReader.ReadObjectIdentifierAsString());
sigAlgReader.ReadNull();
Assert.False(sigAlgReader.HasData);
}