/// <summary>
/// Compute the segment HoD.
/// </summary>
/// <param name="kp">The Kp data</param>
/// <param name="hod">The segment HoD</param>
/// <param name="hashAlgo">The HoHoDk hash algorithm.</param>
/// <returns>The HoHoDk data</returns>
public static byte[] GetHoHoDkBytes(byte[] kp, byte[] hod, dwHashAlgoV2_Values hashAlgo)
{
HMAC hohodkAlgo = null;
List <byte> tempList = new List <byte>();
switch (hashAlgo)
{
case dwHashAlgoV2_Values.TRUNCATED_SHA512:
hohodkAlgo = HMAC.Create(ALGOHMACSHA512);
break;
default:
throw new NotImplementedException();
}
hohodkAlgo.Key = kp;
tempList.AddRange(hod);
tempList.AddRange(Encoding.Unicode.GetBytes(HOHODKAPPENDSTRING));
var hash = hohodkAlgo.ComputeHash(tempList.ToArray());
if (hashAlgo == dwHashAlgoV2_Values.TRUNCATED_SHA512)
{
hash = hash.Take(32).ToArray();
}
return(hash);
}
/// <summary>
/// Get the hash algorithm and hmac algorithm for V2.
/// </summary>
/// <param name="hashAlgo">The hash algorithm value</param>
/// <returns>The hash algorithm and hmac algorithm</returns>
public static void GetHashAlgorithm(dwHashAlgoV2_Values hashAlgo, out HashAlgorithm hashAlgorithm, out HMAC hmacAlgorithm)
{
switch (hashAlgo)
{
case dwHashAlgoV2_Values.TRUNCATED_SHA512:
hashAlgorithm = HashAlgorithm.Create("SHA512");
hmacAlgorithm = HMAC.Create("HMACSHA512");
break;
default:
throw new NotImplementedException();
}
}
/// <summary>
/// Get the hash algorithm and hmac algorithm for V2.
/// </summary>
/// <param name="hashAlgo">The hash algorithm value</param>
/// <returns>The hash algorithm and hmac algorithm</returns>
public static void GetHashAlgorithm(dwHashAlgoV2_Values hashAlgo, out HashAlgorithm hashAlgorithm, out HMAC hmacAlgorithm)
{
switch (hashAlgo)
{
case dwHashAlgoV2_Values.TRUNCATED_SHA512:
hashAlgorithm = HashAlgorithm.Create("SHA512");
hmacAlgorithm = HMAC.Create("HMACSHA512");
break;
default:
throw new NotImplementedException();
}
}
public void VerifyHashGenerationV2(byte[] content, Content_Information_Data_Structure_V2 contentInfoV2)
{
dwHashAlgoV2_Values hashAlgo = contentInfoV2.dwHashAlgo;
HashAlgorithm hashAlgorithm;
HMAC hmacAlgorithm;
PccrcUtility.GetHashAlgorithm(hashAlgo, out hashAlgorithm, out hmacAlgorithm);
hmacAlgorithm.Key = hashAlgorithm.ComputeHash(testConfig.ServerSecret).Take(32).ToArray();
// Local calculate SegmentHashOfData and SegmentSecret
ChunkDescription[] chunkDescription = contentInfoV2.chunks;
int chunkCount = contentInfoV2.chunks.Length;
int segmentOffset = 0;
for (int chunkIndex = 0; chunkIndex < chunkCount; chunkIndex++)
{
SegmentDescriptionV2[] segmentDescription = chunkDescription[chunkIndex].chunkData;
int segmentCount = segmentDescription.Length;
for (int segmentIndex = 0; segmentIndex < segmentCount; ++segmentIndex)
{
var segment = content.Skip(segmentOffset).Take((int)(segmentDescription[segmentIndex].cbSegment)).ToArray();
segmentOffset += (int)(segmentDescription[segmentIndex].cbSegment);
//TRANCATED_SHA_512
byte[] hod = hashAlgorithm.ComputeHash(segment).Take(32).ToArray();
testSite.Assert.IsTrue(
hod.SequenceEqual((chunkDescription[chunkIndex].chunkData)[segmentIndex].SegmentHashOfData),
"The local calculated Hod should cosistent with the received value.");
byte[] kp = hmacAlgorithm.ComputeHash(hod).Take(32).ToArray();
testSite.Assert.IsTrue(
kp.SequenceEqual((chunkDescription[chunkIndex].chunkData)[segmentIndex].SegmentSecret),
"The local calculated Kp should be consistent with the received value.");
}
}
}
/// <summary>
/// Compute the segment HoD.
/// </summary>
/// <param name="kp">The Kp data</param>
/// <param name="hod">The segment HoD</param>
/// <param name="hashAlgo">The HoHoDk hash algorithm.</param>
/// <returns>The HoHoDk data</returns>
public static byte[] GetHoHoDkBytes(byte[] kp, byte[] hod, dwHashAlgoV2_Values hashAlgo)
{
HMAC hohodkAlgo = null;
List<byte> tempList = new List<byte>();
switch (hashAlgo)
{
case dwHashAlgoV2_Values.TRUNCATED_SHA512:
hohodkAlgo = HMAC.Create(ALGOHMACSHA512);
break;
default:
throw new NotImplementedException();
}
hohodkAlgo.Key = kp;
tempList.AddRange(hod);
tempList.AddRange(Encoding.Unicode.GetBytes(HOHODKAPPENDSTRING));
var hash = hohodkAlgo.ComputeHash(tempList.ToArray());
if (hashAlgo == dwHashAlgoV2_Values.TRUNCATED_SHA512)
hash = hash.Take(32).ToArray();
return hash;
}
