private void ReadHeaderV1(BinaryReader br)
{
header = new HeaderV1();
header.magic = new string(br.ReadChars(4));
header.type = br.ReadUInt32();
header.width = br.ReadUInt32();
header.height = br.ReadUInt32();
header.unk1 = br.ReadUInt32();
header.unk2 = br.ReadUInt32();
header.mips = br.ReadUInt32();
header.format = br.ReadUInt32();
}
protected internal Header GenerateHeader(
ISymmetricEncryptionProviderOptions options,
ReadOnlySpan <byte> symmetricKey = default,
ReadOnlySpan <byte> privateKey = default,
ReadOnlySpan <byte> metadata = default,
IEncryptionProvider symmetricKeyEncryptionProvider = null)
{
Check.NotNull(nameof(options), options);
privateKey = !privateKey.IsEmpty ? privateKey : options.Key.Memory.Span;
ReadOnlySpan <byte> signingKey = default;
if (options.SigningKey != null)
{
signingKey = options.SigningKey.Memory.Span;
}
// header values
// 1. version
// 2. metadataSize
// 3. iterations
// 4. symmetricSaltSize
// 5. signingSaltSize
// 6. ivSize
// 7. symmetricKeySize
// 8. hashSize
// header values
// 1. metadata (optional)
// 2. symmetricSalt (optional)
// 3. signingSalt (optional)
// 4. iv
// 5. symmetricKey (optional)
// 6. hash
var header = new HeaderV1();
header.MetaDataSize = metadata.Length;
bool privateKeyEmpty = privateKey == null || privateKey.IsEmpty;
bool symmetricKeyEmpty = symmetricKey == null || symmetricKey.IsEmpty;
if (privateKeyEmpty && symmetricKeyEmpty)
{
throw new ArgumentNullException(nameof(privateKey), "privateKey or symmetricKey must have a value");
}
if (!options.SkipSigning && privateKeyEmpty && signingKey.IsEmpty)
{
throw new ArgumentNullException(nameof(privateKey),
"privateKey must have a value or options.SigningKey must have a value or options.SkipSigning must be true");
}
if (!privateKeyEmpty)
{
header.SymmetricSaltSize = (short)(options.SaltSize / 8);
if (!options.SkipSigning && (signingKey == null || signingKey.IsEmpty))
{
header.SigningSaltSize = (short)(options.SaltSize / 8);
this.signingAlgorithm = this.signingAlgorithm ?? CreateSigningAlgorithm(options);
}
}
if (!symmetricKeyEmpty)
{
header.SymmetricKeySize = (short)(options.KeySize / 8);
}
this.algorithm = this.algorithm ?? CreateSymmetricAlgorithm(options);
this.algorithm.GenerateIV();
var iv = this.algorithm.IV;
header.IvSize = (short)iv.Length;
{
var buffer = MemoryPool <byte> .Shared.Rent(iv.Length);
iv.CopyTo(buffer.Memory.Span);
header.IV = buffer;
}
header.HashSize = (short)(this.signingAlgorithm.HashSize / 8);
header.Iterations = options.Iterations;
using (var ms = new MemoryStream(new byte[header.HeaderSize]))
using (var bw = new BinaryWriter(ms, Utf8.NoBom, false))
{
if (!symmetricKey.IsEmpty && symmetricKeyEncryptionProvider != null)
{
symmetricKey = symmetricKeyEncryptionProvider.Encrypt(symmetricKey);
header.SymmetricKeySize = (short)symmetricKey.Length;
}
header.SymmetricAlgorithmType = options.SymmetricAlgorithm;
header.KeyedHashAlgorithmType = options.KeyedHashedAlgorithm;
bw.Write(header.Version);
bw.Write((short)header.SymmetricAlgorithmType);
bw.Write((short)header.KeyedHashAlgorithmType);
bw.Write(header.MetaDataSize);
bw.Write(header.Iterations);
bw.Write(header.SymmetricSaltSize);
bw.Write(header.SigningSaltSize);
bw.Write(header.IvSize);
bw.Write(header.SymmetricKeySize);
bw.Write(header.HashSize);
if (privateKey != null)
{
ReadOnlySpan <byte> symmetricSalt = GenerateSalt(header.SymmetricSaltSize);
if (symmetricSalt.Length != header.SymmetricSaltSize)
{
throw new Exception("bad length");
}
using (var generator = new Rfc2898DeriveBytes(privateKey, symmetricSalt, options.Iterations, HashAlgorithmName.SHA256))
{
//symmetricSalt = generator.Salt;
ReadOnlySpan <byte> bytes = generator.GetBytes(options.KeySize / 8);
var buffer = MemoryPool <byte> .Shared.Rent(bytes.Length);
bytes.CopyTo(buffer.Memory.Span);
header.SymmetricKey = buffer;
bw.Write(symmetricSalt);
}
if (!options.SkipSigning || !signingKey.IsEmpty)
{
var signingSalt = GenerateSalt(header.SigningSaltSize);
using (var generator = new Rfc2898DeriveBytes(
privateKey, signingSalt, options.Iterations, HashAlgorithmName.SHA256))
{
signingKey = generator.GetBytes(options.KeySize / 8);
var buffer = MemoryPool <byte> .Shared.Rent(signingKey.Length);
signingKey.CopyTo(buffer.Memory.Span);
header.SigningKey = buffer;
bw.Write(signingSalt);
}
signingSalt.Clear();
}
}
bw.Write(iv);
if (!symmetricKeyEmpty)
{
bw.Write(symmetricKey);
}
bw.Flush();
ms.Flush();
header.Position = ms.Position;
ReadOnlySpan <byte> data = ms.ToArray();
header.Bytes = MemoryPool <byte> .Shared.Rent(header.HeaderSize);
data.CopyTo(header.Bytes.Memory.Span);
}
return(header);
}
protected internal Header ReadHeader(
Stream reader,
ISymmetricEncryptionProviderOptions options,
ReadOnlySpan <byte> privateKey = default,
IEncryptionProvider symmetricKeyEncryptionProvider = null)
{
Check.NotNull(nameof(reader), reader);
Check.NotNull(nameof(options), options);
ReadOnlySpan <byte> signingKey = default;
if (options.SigningKey != null)
{
signingKey = options.SigningKey.Memory.Span;
}
using (var ms = new MemoryStream())
using (var bw = new BinaryWriter(ms, Utf8.NoBom, true))
using (var br = new BinaryReader(reader, Utf8.NoBom, true))
{
var version = br.ReadInt16();
bw.Write(version);
Header header = null;
switch (version)
{
case 1:
default:
header = new HeaderV1();
break;
}
// header shorts/ints
// 1. version
// 2. algo
// 3. signing,
// 4. metadataSize
// 5 iterations
// 6. symmetricSaltSize
// 7. signingSaltSize
// 8. ivSize
// 9. symmetricKeySize
// 10. hashSize
// header values
// 1. metadata
// 2. symmetricSalt
// 3. signingSalt
// 4. iv
// 5. symmetricKey
// 6. hash
header.SymmetricAlgorithmType = (SymmetricAlgorithmType)br.ReadInt16();
header.KeyedHashAlgorithmType = (KeyedHashAlgorithmType)br.ReadInt16();
header.MetaDataSize = br.ReadInt32();
header.Iterations = br.ReadInt32();
header.SymmetricSaltSize = br.ReadInt16();
header.SigningSaltSize = br.ReadInt16();
header.IvSize = br.ReadInt16();
header.SymmetricKeySize = br.ReadInt16();
header.HashSize = br.ReadInt16();
bw.Write((short)header.SymmetricAlgorithmType);
bw.Write((short)header.KeyedHashAlgorithmType);
bw.Write(header.MetaDataSize);
bw.Write(header.Iterations);
bw.Write(header.SymmetricSaltSize);
bw.Write(header.SigningSaltSize);
bw.Write(header.IvSize);
bw.Write(header.SymmetricKeySize);
bw.Write(header.HashSize);
if (options.SymmetricAlgorithm != header.SymmetricAlgorithmType)
{
options.SymmetricAlgorithm = header.SymmetricAlgorithmType;
this.algorithm = null;
}
if (options.KeyedHashedAlgorithm != header.KeyedHashAlgorithmType)
{
options.KeyedHashedAlgorithm = header.KeyedHashAlgorithmType;
this.signingAlgorithm = null;
}
byte[] metadata = null;
byte[] symmetricSalt = null;
ReadOnlySpan <byte> signingSalt = default;
byte[] iv = null;
ReadOnlySpan <byte> symmetricKey = default;
byte[] hash = null;
if (header.MetaDataSize > 0)
{
metadata = br.ReadBytes(header.MetaDataSize);
bw.Write(metadata);
}
if (header.SymmetricSaltSize > 0)
{
symmetricSalt = br.ReadBytes(header.SymmetricSaltSize);
bw.Write(symmetricSalt);
}
if (header.SigningSaltSize > 0)
{
signingSalt = br.ReadBytes(header.SigningSaltSize);
bw.Write(signingSalt);
}
if (header.IvSize > 0)
{
iv = br.ReadBytes(header.IvSize);
bw.Write(iv);
}
if (header.SymmetricKeySize > 0)
{
symmetricKey = br.ReadBytes(header.SymmetricKeySize);
bw.Write(symmetricKey);
}
if (header.HashSize > 0)
{
hash = br.ReadBytes(header.HashSize);
bw.Write(hash);
}
bw.Flush();
ms.Flush();
{
var bytes = ms.ToArray();
var buffer = MemoryPool <byte> .Shared.Rent(bytes.Length);
bytes.CopyTo(buffer.Memory.Span);
header.Bytes = buffer;
}
header.Position = reader.Position;
if (symmetricKeyEncryptionProvider != null)
{
symmetricKey = symmetricKeyEncryptionProvider.Decrypt(symmetricKey);
}
if (symmetricKey == null && privateKey.IsEmpty)
{
throw new ArgumentNullException(nameof(privateKey),
"privateKey or symmetricKey must have a value");
}
if (!options.SkipSigning && privateKey == null && signingKey.IsEmpty)
{
throw new ArgumentNullException(nameof(privateKey),
"privateKey must have a value or options.SigningKey must have a value or options.SkipSigning must be true");
}
if (symmetricKey == null)
{
if (symmetricSalt == null)
{
throw new InvalidOperationException("symmetricSalt for the privateKey could not be retrieved");
}
using (var generator = new Rfc2898DeriveBytes(privateKey, symmetricSalt, header.Iterations, HashAlgorithmName.SHA256))
{
var buffer = MemoryPool <byte> .Shared.Rent(options.KeySize / 8);
ReadOnlySpan <byte> bytes = generator.GetBytes(options.KeySize / 8);
bytes.CopyTo(buffer.Memory.Span);
header.SymmetricKey = buffer;
}
}
if (!options.SkipSigning && (signingKey == null || signingKey.IsEmpty))
{
if (signingSalt == null)
{
throw new InvalidOperationException("symmetricSalt for the privateKey could not be retrieved");
}
var key = !symmetricKey.IsEmpty ? symmetricKey : privateKey;
using (var generator = new Rfc2898DeriveBytes(key, signingSalt, header.Iterations, HashAlgorithmName.SHA256))
{
generator.IterationCount = header.Iterations;
var buffer = MemoryPool <byte> .Shared.Rent(options.KeySize / 8);
ReadOnlySpan <byte> bytes = generator.GetBytes(options.KeySize / 8);
bytes.CopyTo(buffer.Memory.Span);
header.SigningKey = buffer;
}
}
{
IMemoryOwner <byte> buffer = null;
if (header.SymmetricKeySize > 0)
{
buffer = MemoryPool <byte> .Shared.Rent(header.SymmetricKeySize);
symmetricKey.CopyTo(buffer.Memory.Span);
header.SymmetricKey = buffer;
}
buffer = MemoryPool <byte> .Shared.Rent(iv.Length);
iv.CopyTo(buffer.Memory.Span);
header.IV = buffer;
buffer = MemoryPool <byte> .Shared.Rent(header.HashSize);
hash.CopyTo(buffer.Memory.Span);
header.Hash = buffer;
}
return(header);
}
}
public void ReadHeaderV1()
{
log.Debug("Reading ABF Header (v1)");
headerV1 = new HeaderV1();
headerV1.fFileSignature = FileReadString(0, 4); //4s;
headerV1.fFileVersionNumber = FileReadFloat(4, 1); //f;
headerV1.nOperationMode = FileReadShort(8, 1); //h;
headerV1.lActualAcqLength = FileReadInt(10, 1); //i;
headerV1.nNumPointsIgnored = FileReadShort(14, 1); //h;
headerV1.lActualEpisodes = FileReadInt(16, 1); //i;
headerV1.lFileStartTime = FileReadInt(24, 1); //i;
headerV1.lDataSectionPtr = FileReadInt(40, 1); //i;
headerV1.lTagSectionPtr = FileReadInt(44, 1); //i;
headerV1.lNumTagEntries = FileReadInt(48, 1); //i;
headerV1.lSynchArrayPtr = FileReadInt(92, 1); //i;
headerV1.lSynchArraySize = FileReadInt(96, 1); //i;
headerV1.nDataFormat = FileReadShort(100, 1); //h;
headerV1.nADCNumChannels = FileReadShort(120, 1); //h;
headerV1.fADCSampleInterval = FileReadFloat(122, 1); //f;
headerV1.fSynchTimeUnit = FileReadFloat(130, 1); //f;
headerV1.lNumSamplesPerEpisode = FileReadInt(138, 1); //i;
headerV1.lPreTriggerSamples = FileReadInt(142, 1); //i;
headerV1.lEpisodesPerRun = FileReadInt(146, 1); //i;
headerV1.fADCRange = FileReadFloat(244, 1); //f;
headerV1.lADCResolution = FileReadInt(252, 1); //i;
headerV1.nFileStartMillisecs = FileReadShort(366, 1); //h;
headerV1.nADCPtoLChannelMap = FileReadShorts(378, 16); //16h;
headerV1.nADCSamplingSeq = FileReadShorts(410, 16); //16h;
headerV1.sADCChannelName = FileReadStrings(442, 10, 16); //10s;
headerV1.sADCUnits = FileReadStrings(602, 8, 16); //8s;
headerV1.fADCProgrammableGain = FileReadFloats(730, 16); //16f;
headerV1.fInstrumentScaleFactor = FileReadFloats(922, 16); //16f;
headerV1.fInstrumentOffset = FileReadFloats(986, 16); //16f;
headerV1.fSignalGain = FileReadFloats(1050, 16); //16f;
headerV1.fSignalOffset = FileReadFloats(1114, 16); //16f;
headerV1.nDigitalEnable = FileReadShort(1436, 1); //h;
headerV1.nActiveDACChannel = FileReadShort(1440, 1); //h;
headerV1.nDigitalHolding = FileReadShort(1584, 1); //h;
headerV1.nDigitalInterEpisode = FileReadShort(1586, 1); //h;
headerV1.nDigitalValue = FileReadShorts(2588, 10); //10h;
headerV1.lDACFilePtr = FileReadInts(2048, 2); //2i;
headerV1.lDACFileNumEpisodes = FileReadInts(2056, 2); //2i;
headerV1.fDACCalibrationFactor = FileReadFloats(2074, 4); //4f;
headerV1.fDACCalibrationOffset = FileReadFloats(2090, 4); //4f;
headerV1.nWaveformEnable = FileReadShorts(2296, 2); //2h;
headerV1.nWaveformSource = FileReadShorts(2300, 2); //2h;
headerV1.nInterEpisodeLevel = FileReadShorts(2304, 2); //2h;
headerV1.nEpochType = FileReadShorts(2308, 20); //20h;
headerV1.fEpochInitLevel = FileReadFloats(2348, 20); //20f;
headerV1.fEpochLevelInc = FileReadFloats(2428, 20); //20f;
headerV1.lEpochInitDuration = FileReadInts(2508, 20); //20i;
headerV1.lEpochDurationInc = FileReadInts(2588, 20); //20i;
headerV1.nTelegraphEnable = FileReadShorts(4512, 16); //16h;
headerV1.fTelegraphAdditGain = FileReadFloats(4576, 16); //16f;
headerV1.sProtocolPath = FileReadString(4898, 384); //384s;
// clean up adc and dac units
for (int i = 0; i < headerV1.sADCUnits.Length; i++)
{
headerV1.sADCUnits[i] = headerV1.sADCUnits[i].Trim();
}
for (int i = 0; i < headerV1.sADCChannelName.Length; i++)
{
headerV1.sADCChannelName[i] = headerV1.sADCChannelName[i].Trim();
}
}
