private static void ParseDekAlgName(
string dekAlgName,
out PemBaseAlg baseAlg,
out PemMode mode)
{
try
{
mode = PemMode.ECB;
if (dekAlgName == "DES-EDE" || dekAlgName == "DES-EDE3")
{
baseAlg = (PemBaseAlg)Enums.GetEnumValue(typeof(PemBaseAlg), dekAlgName);
return;
}
int pos = dekAlgName.LastIndexOf('-');
if (pos >= 0)
{
baseAlg = (PemBaseAlg)Enums.GetEnumValue(typeof(PemBaseAlg), dekAlgName.Substring(0, pos));
mode = (PemMode)Enums.GetEnumValue(typeof(PemMode), dekAlgName.Substring(pos + 1));
return;
}
}
catch (ArgumentException)
{
}
throw new EncryptionException("Unknown DEK algorithm: " + dekAlgName);
}
private static void ParseDekAlgName(
string dekAlgName,
out PemBaseAlg baseAlg,
out PemMode mode)
{
try
{
mode = PemMode.ECB;
if (dekAlgName == "DES-EDE" || dekAlgName == "DES-EDE3")
{
baseAlg = (PemBaseAlg)Enums.GetEnumValue(typeof(PemBaseAlg), dekAlgName);
return;
}
int pos = dekAlgName.LastIndexOf('-');
if (pos >= 0)
{
baseAlg = (PemBaseAlg)Enums.GetEnumValue(typeof(PemBaseAlg), dekAlgName.Substring(0, pos));
mode = (PemMode)Enums.GetEnumValue(typeof(PemMode), dekAlgName.Substring(pos + 1));
return;
}
}
catch (ArgumentException)
{
}
throw new EncryptionException("Unknown DEK algorithm: " + dekAlgName);
}
private static ICipherParameters GetCipherParameters(
char[] password,
PemBaseAlg baseAlg,
byte[] salt)
{
string algorithm;
int keyBits;
switch (baseAlg)
{
case PemBaseAlg.AES_128: keyBits = 128; algorithm = "AES128"; break;
case PemBaseAlg.AES_192: keyBits = 192; algorithm = "AES192"; break;
case PemBaseAlg.AES_256: keyBits = 256; algorithm = "AES256"; break;
case PemBaseAlg.BF: keyBits = 128; algorithm = "BLOWFISH"; break;
case PemBaseAlg.DES: keyBits = 64; algorithm = "DES"; break;
case PemBaseAlg.DES_EDE: keyBits = 128; algorithm = "DESEDE"; break;
case PemBaseAlg.DES_EDE3: keyBits = 192; algorithm = "DESEDE3"; break;
case PemBaseAlg.RC2: keyBits = 128; algorithm = "RC2"; break;
case PemBaseAlg.RC2_40: keyBits = 40; algorithm = "RC2"; break;
case PemBaseAlg.RC2_64: keyBits = 64; algorithm = "RC2"; break;
default:
return(null);
}
OpenSslPbeParametersGenerator pGen = new OpenSslPbeParametersGenerator();
pGen.Init(PbeParametersGenerator.Pkcs5PasswordToBytes(password), salt);
return(pGen.GenerateDerivedParameters(algorithm, keyBits));
}
private static ICipherParameters GetCipherParameters(
char[] password,
PemBaseAlg baseAlg,
byte[] salt)
{
string algorithm;
int keyBits;
switch (baseAlg)
{
case PemBaseAlg.AES_128: keyBits = 128; algorithm = "AES128"; break;
case PemBaseAlg.AES_192: keyBits = 192; algorithm = "AES192"; break;
case PemBaseAlg.AES_256: keyBits = 256; algorithm = "AES256"; break;
case PemBaseAlg.BF: keyBits = 128; algorithm = "BLOWFISH"; break;
case PemBaseAlg.DES: keyBits = 64; algorithm = "DES"; break;
case PemBaseAlg.DES_EDE: keyBits = 128; algorithm = "DESEDE"; break;
case PemBaseAlg.DES_EDE3: keyBits = 192; algorithm = "DESEDE3"; break;
case PemBaseAlg.RC2: keyBits = 128; algorithm = "RC2"; break;
case PemBaseAlg.RC2_40: keyBits = 40; algorithm = "RC2"; break;
case PemBaseAlg.RC2_64: keyBits = 64; algorithm = "RC2"; break;
default:
return null;
}
OpenSslPbeParametersGenerator pGen = new OpenSslPbeParametersGenerator();
pGen.Init(PbeParametersGenerator.Pkcs5PasswordToBytes(password), salt);
return pGen.GenerateDerivedParameters(algorithm, keyBits);
}
