/// <summary>
/// A message is generated by encrypting a hard coded value with the provided Master Key and
/// Initialization Vector.
/// The message is then passed to the hashing function and the key used is the provided Master Key.
/// </summary>
public Authorization(MasterKey masterKey, byte[] initializationVector, Aes aes, HmacSha256 hmacSha256)
{
InitializationVector = initializationVector;
var ciphertext = aes.Encrypt(AuthorizedMessage, masterKey.SecretKey, initializationVector);
Hmac = hmacSha256.Compute(ciphertext, masterKey.SecretKey);
}
public static byte[] GenerateChecksum(string checksum, int offset, byte[] buffer, int eof = -1)
{
byte[] returnValue = null;
switch (checksum)
{
case "Adler8 - {1Bytes}":
returnValue = eof == -1 ? Adler8.Compute(offset, buffer) : Adler8.Compute(offset, buffer, eof);
break;
case "Adler16 - {2Bytes}":
returnValue = eof == -1 ? Adler16.Compute(offset, buffer) : Adler16.Compute(offset, buffer, eof);
break;
case "Adler32 - {4Bytes}":
returnValue = eof == -1 ? Adler32.Compute(offset, buffer) : Adler32.Compute(offset, buffer, eof);
break;
case "Checksum8 - {1Bytes}":
returnValue = eof == -1 ? Checksum8.Compute(offset, buffer) : Checksum8.Compute(offset, buffer, eof);
break;
case "Checksum16 - {2Bytes}":
returnValue = eof == -1 ? Checksum16.Compute(offset, buffer) : Checksum16.Compute(offset, buffer, eof);
break;
case "Checksum24 - {3Bytes}":
returnValue = eof == -1 ? Checksum24.Compute(offset, buffer) : Checksum24.Compute(offset, buffer, eof);
break;
case "Checksum32 - {4Bytes}":
returnValue = eof == -1 ? Checksum32.Compute(offset, buffer) : Checksum32.Compute(offset, buffer, eof);
break;
case "Checksum40 - {5Bytes}":
returnValue = eof == -1 ? Checksum40.Compute(offset, buffer) : Checksum40.Compute(offset, buffer, eof);
break;
case "Checksum48 - {6Bytes}":
returnValue = eof == -1 ? Checksum48.Compute(offset, buffer) : Checksum48.Compute(offset, buffer, eof);
break;
case "Checksum56 - {7Bytes}":
returnValue = eof == -1 ? Checksum56.Compute(offset, buffer) : Checksum56.Compute(offset, buffer, eof);
break;
case "Checksum64 - {8Bytes}":
returnValue = eof == -1 ? Checksum64.Compute(offset, buffer) : Checksum64.Compute(offset, buffer, eof);
break;
case "CRC16 - {2Bytes}":
Crc16 crc16 = new Crc16();
returnValue = eof == -1 ? crc16.Compute(offset, buffer) : crc16.Compute(offset, buffer, eof);
break;
case "CRC16 CCITT - {2Bytes}":
Crc16ccitt crc16Ccitt = new Crc16ccitt();
returnValue = eof == -1 ? crc16Ccitt.Compute(offset, buffer) : crc16Ccitt.Compute(offset, buffer, eof);
break;
case "CRC32 - {4Bytes}":
returnValue = eof == -1 ? Crc32.Compute(offset, buffer) : Crc32.Compute(offset, buffer, eof);
break;
case "HMAC SHA 1 (128) - {16Bytes}":
returnValue = eof == -1 ? HmacSha1.Compute(offset, buffer) : HmacSha1.Compute(offset, buffer, eof);
break;
case "HMAC SHA 256 - {32Bytes}":
returnValue = eof == -1 ? HmacSha256.Compute(offset, buffer) : HmacSha256.Compute(offset, buffer, eof);
break;
case "HMAC SHA 384 - {48Bytes}":
returnValue = eof == -1 ? HmacSha384.Compute(offset, buffer) : HmacSha384.Compute(offset, buffer, eof);
break;
case "HMAC SHA 512 - {64Bytes}":
returnValue = eof == -1 ? HmacSha512.Compute(offset, buffer) : HmacSha512.Compute(offset, buffer, eof);
break;
case "MD5 - {16Bytes}":
returnValue = eof == -1 ? Md5.Compute(offset, buffer) : Md5.Compute(offset, buffer, eof);
break;
case "MD5 CNG - {16Bytes}":
returnValue = eof == -1 ? Md5Cng.Compute(offset, buffer) : Md5Cng.Compute(offset, buffer, eof);
break;
}
return(returnValue);
}