diff options
Diffstat (limited to 'crypto/src/openssl/PEMUtilities.cs')
| -rw-r--r-- | crypto/src/openssl/PEMUtilities.cs | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/crypto/src/openssl/PEMUtilities.cs b/crypto/src/openssl/PEMUtilities.cs new file mode 100644 index 000000000..b58e5e765 --- /dev/null +++ b/crypto/src/openssl/PEMUtilities.cs @@ -0,0 +1,158 @@ +using System; + +using Org.BouncyCastle.Crypto; +using Org.BouncyCastle.Crypto.Generators; +using Org.BouncyCastle.Crypto.Parameters; +using Org.BouncyCastle.Security; +using Org.BouncyCastle.Utilities; + +namespace Org.BouncyCastle.OpenSsl +{ + internal sealed class PemUtilities + { + private enum PemBaseAlg { AES_128, AES_192, AES_256, BF, DES, DES_EDE, DES_EDE3, RC2, RC2_40, RC2_64 }; + private enum PemMode { CBC, CFB, ECB, OFB }; + + static PemUtilities() + { + // Signal to obfuscation tools not to change enum constants + ((PemBaseAlg)Enums.GetArbitraryValue(typeof(PemBaseAlg))).ToString(); + ((PemMode)Enums.GetArbitraryValue(typeof(PemMode))).ToString(); + } + + 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); + } + + internal static byte[] Crypt( + bool encrypt, + byte[] bytes, + char[] password, + string dekAlgName, + byte[] iv) + { + PemBaseAlg baseAlg; + PemMode mode; + ParseDekAlgName(dekAlgName, out baseAlg, out mode); + + string padding; + switch (mode) + { + case PemMode.CBC: + case PemMode.ECB: + padding = "PKCS5Padding"; + break; + case PemMode.CFB: + case PemMode.OFB: + padding = "NoPadding"; + break; + default: + throw new EncryptionException("Unknown DEK algorithm: " + dekAlgName); + } + + string algorithm; + + byte[] salt = iv; + switch (baseAlg) + { + case PemBaseAlg.AES_128: + case PemBaseAlg.AES_192: + case PemBaseAlg.AES_256: + algorithm = "AES"; + if (salt.Length > 8) + { + salt = new byte[8]; + Array.Copy(iv, 0, salt, 0, salt.Length); + } + break; + case PemBaseAlg.BF: + algorithm = "BLOWFISH"; + break; + case PemBaseAlg.DES: + algorithm = "DES"; + break; + case PemBaseAlg.DES_EDE: + case PemBaseAlg.DES_EDE3: + algorithm = "DESede"; + break; + case PemBaseAlg.RC2: + case PemBaseAlg.RC2_40: + case PemBaseAlg.RC2_64: + algorithm = "RC2"; + break; + default: + throw new EncryptionException("Unknown DEK algorithm: " + dekAlgName); + } + + string cipherName = algorithm + "/" + mode + "/" + padding; + IBufferedCipher cipher = CipherUtilities.GetCipher(cipherName); + + ICipherParameters cParams = GetCipherParameters(password, baseAlg, salt); + + if (mode != PemMode.ECB) + { + cParams = new ParametersWithIV(cParams, iv); + } + + cipher.Init(encrypt, cParams); + + return cipher.DoFinal(bytes); + } + + 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); + } + } +} |