internal HMACHashResult VerifyFileHMAC(Enums.HMACAlgorithm hmacAlgorithm, string hmacHexString, string filePathToVerifyHMAC, byte[] key,
long offset = 0, long count = 0)
{
var hmacBytes = Encoding.HighPerformanceHexadecimal.ToByteArray(hmacHexString);
return(VerifyFileHMAC(hmacAlgorithm, hmacBytes, filePathToVerifyHMAC, key, offset, count));
}
internal HMACHashResult VerifyHMAC(Enums.HMACAlgorithm hmacAlgorithm, string hmacHexString, string stringToVerifyHMAC, byte[] key,
int offset = 0, int count = 0)
{
var hmacBytes = Encoding.HighPerformanceHexadecimal.ToByteArray(hmacHexString);
var stringToVerifyHMACBytes = System.Text.Encoding.UTF8.GetBytes(stringToVerifyHMAC);
return(VerifyHMAC(hmacAlgorithm, hmacBytes, stringToVerifyHMACBytes, key, offset, count));
}
internal HMACHashResult ComputeHMAC(Enums.HMACAlgorithm hmacAlgorithm, byte[] bytesToComputeHMAC, byte[] key = null,
int offset = 0, int count = 0)
{
if (bytesToComputeHMAC == null || bytesToComputeHMAC.Length <= 0)
{
return(new HMACHashResult()
{
Success = false,
Message = MessageDictionary.Instance["HMAC.InputRequired"]
});
}
if (key == null || key.Length == 0)
{
key = CommonMethods.GenerateRandomBytes(HMACOutputLengthDictionary.Instance[hmacAlgorithm] / 8);
}
HMACHashResult result = null;
try
{
using (var hmac = (HMAC)CryptoConfig.CreateFromName(hmacAlgorithm.ToString()))
{
hmac.Key = key;
//offset = (offset == 0 ? 0 : offset);
count = (count == 0 ? bytesToComputeHMAC.Length : count);
byte[] hash = hmac.ComputeHash(bytesToComputeHMAC, offset, count);
result = new HMACHashResult()
{
Success = true,
Message = MessageDictionary.Instance["HMAC.ComputeSuccess"],
HashBytes = hash,
HashString = Encoding.HighPerformanceHexadecimal.ToHexString(hash),
Key = key,
PRF = hmacAlgorithm
};
}
}
catch (Exception ex)
{
return(new HMACHashResult()
{
Success = false,
Message = ex.ToString()
});
}
return(result);
}
internal HMACHashResult VerifyFileHMAC(Enums.HMACAlgorithm hmacAlgorithm, byte[] hmacBytes, string filePathToVerifyHMAC, byte[] key,
long offset = 0, long count = 0)
{
var hmacResult = ComputeFileHMAC(hmacAlgorithm, filePathToVerifyHMAC, key, offset, count);
if (hmacResult.Success)
{
var hashesMatch = hmacResult.HashBytes.SequenceEqual(hmacBytes);
hmacResult.Success = hashesMatch;
hmacResult.Message = $"{(hashesMatch ? MessageDictionary.Instance["Hash.Match"] : MessageDictionary.Instance["Hash.DoesNotMatch"])}";
}
return(hmacResult);
}
internal HMACHashResult VerifyHMAC(Enums.HMACAlgorithm hmacAlgorithm, byte[] hmacBytes, byte[] bytesToVerifyHMAC, byte[] key,
int offset = 0, int count = 0)
{
var hmacResult = ComputeHMAC(hmacAlgorithm, bytesToVerifyHMAC, key, offset, count);
if (hmacResult.Success)
{
var hashesMatch = hmacResult.HashBytes.SequenceEqual(hmacBytes);
hmacResult.Success = hashesMatch;
hmacResult.Message = $"{(hashesMatch ? MessageStrings.Hash_Match : MessageStrings.Hash_DoesNotMatch)}";
}
return(hmacResult);
}
internal HMACHashResult ComputeHMAC(Enums.HMACAlgorithm hmacAlgorithm, string stringToComputeHMAC, byte[] key = null,
int offset = 0, int count = 0)
{
if (string.IsNullOrWhiteSpace(stringToComputeHMAC))
{
return(new HMACHashResult()
{
Success = false,
Message = MessageDictionary.Instance["HMAC.InputRequired"]
});
}
var stringToComputeHMACBytes = System.Text.Encoding.UTF8.GetBytes(stringToComputeHMAC);
return(ComputeHMAC(hmacAlgorithm, stringToComputeHMACBytes, key, offset, count));
}
internal HMACHashResult ComputeFileHMAC(Enums.HMACAlgorithm hmacAlgorithm, string filePathToComputeHMAC, byte[] key = null,
long offset = 0, long count = 0)
{
if (!File.Exists(filePathToComputeHMAC))
{
return(new HMACHashResult()
{
Success = false,
Message = $"{MessageDictionary.Instance["Common.FileNotFound"]} \"{filePathToComputeHMAC}\"."
});
}
if (key == null || key.Length == 0)
{
key = CommonMethods.GenerateRandomBytes(HMACOutputLengthDictionary.Instance[hmacAlgorithm] / 8);
}
HMACHashResult result = null;
try
{
byte[] hash = null;
using (var fStream = new FileStream(filePathToComputeHMAC, FileMode.Open, FileAccess.Read, FileShare.None))
{
//offset = (offset == 0 ? 0 : offset);
count = (count == 0 ? fStream.Length : count);
fStream.Position = offset;
byte[] buffer = new byte[(1024 * 4)];
long amount = (count - offset);
using (var hmac = (HMAC)CryptoConfig.CreateFromName(hmacAlgorithm.ToString()))
{
hmac.Key = key;
int percentageDone = 0;
while (amount > 0)
{
int bytesRead = fStream.Read(buffer, 0, (int)Math.Min(buffer.Length, amount));
if (bytesRead > 0)
{
amount -= bytesRead;
if (amount > 0)
{
hmac.TransformBlock(buffer, 0, bytesRead, buffer, 0);
}
else
{
hmac.TransformFinalBlock(buffer, 0, bytesRead);
}
var tmpPercentageDone = (int)(fStream.Position * 100 / count);
if (tmpPercentageDone != percentageDone)
{
percentageDone = tmpPercentageDone;
RaiseOnHashProgress(percentageDone, (percentageDone != 100 ? $"Computing HMAC ({percentageDone}%)..." : $"HMAC computed ({percentageDone}%)."));
}
}
else
{
throw new InvalidOperationException();
}
}
hash = hmac.Hash;
}
}
result = new HMACHashResult()
{
Success = true,
Message = MessageDictionary.Instance["HMAC.ComputeSuccess"],
HashString = Encoding.HighPerformanceHexadecimal.ToHexString(hash),
HashBytes = hash,
Key = key
};
}
catch (Exception ex)
{
result = new HMACHashResult()
{
Success = false,
Message = ex.ToString()
};
}
return(result);
}
