diff --git a/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj b/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj index 64ee419f3..69f2bb179 100644 --- a/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj +++ b/src/Renci.SshNet.NET35/Renci.SshNet.NET35.csproj @@ -608,6 +608,9 @@ Security\Cryptography\AsymmetricCipher.cs + + Security\Cryptography\Bcrypt.cs + Security\Cryptography\BlockCipher.cs @@ -987,4 +990,4 @@ --> - \ No newline at end of file + diff --git a/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs b/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs index 3c944c8d4..99434d71a 100644 --- a/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs +++ b/src/Renci.SshNet.Tests/Classes/PrivateKeyFileTest.cs @@ -545,6 +545,34 @@ public void ConstructorWithFileNameAndPassPhraseShouldBeAbleToReadFileThatIsShar } } + /// + /// A test for opening an openssh v1 keyfile where there is no passphrase. + /// + [TestMethod()] + [Owner("bhalbright")] + [TestCategory("PrivateKey")] + public void TestOpenSshV1KeyFileNoPassphrase() + { + using (var stream = GetData("Key.OPENSSH.ED25519.txt")) + { + new PrivateKeyFile(stream); + } + } + + /// + /// A test for opening an openssh v1 keyfile where there is a passphrase. + /// + [TestMethod()] + [Owner("bhalbright")] + [TestCategory("PrivateKey")] + public void TestOpenSshV1KeyFileWithPassphrase() + { + using (var stream = GetData("Key.OPENSSH.ED25519.Encrypted.txt")) + { + new PrivateKeyFile(stream, "password"); + } + } + private void SaveStreamToFile(Stream stream, string fileName) { var buffer = new byte[4000]; @@ -567,4 +595,4 @@ private string GetTempFileName() return tempFile; } } -} \ No newline at end of file +} diff --git a/src/Renci.SshNet.Tests/Data/Key.OPENSSH.ED25519.Encrypted.txt b/src/Renci.SshNet.Tests/Data/Key.OPENSSH.ED25519.Encrypted.txt new file mode 100644 index 000000000..50b4d9689 --- /dev/null +++ b/src/Renci.SshNet.Tests/Data/Key.OPENSSH.ED25519.Encrypted.txt @@ -0,0 +1,9 @@ +-----BEGIN OPENSSH PRIVATE KEY----- +b3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jYmMAAAAGYmNyeXB0AAAAGAAAABBg +HWh+J0IG6OfYxD74SoT9AAAAEAAAAAEAAAAzAAAAC3NzaC1lZDI1NTE5AAAAIGFd +yflleGqSPOhgSYZf7ZQFlG0zEL9VDGC69UbtaaByAAAAoDLm8u8wFwlqjzZRfVxj +wzGTYFJFtfkHRqfFBE4xKgknHNRbCT1OQb7rgE7nZbUXIlb1NCTZLbXti9AYNZpz +ycvPD4Dc6lB03b8pNHoFVSkrCwxrWB5bKtIM4OZNcDK1lZDBEWE2aZXf9puRHbu3 +ccrK/F5GjRi2pUa8qnfqThN1mNPZwFTx4oSKeRaUMdeHBrNwDtaxq32A6Q4KHoYO +KPM= +-----END OPENSSH PRIVATE KEY----- diff --git a/src/Renci.SshNet.Tests/Data/Key.OPENSSH.ED25519.txt b/src/Renci.SshNet.Tests/Data/Key.OPENSSH.ED25519.txt new file mode 100644 index 000000000..84811f653 --- /dev/null +++ b/src/Renci.SshNet.Tests/Data/Key.OPENSSH.ED25519.txt @@ -0,0 +1,8 @@ +-----BEGIN OPENSSH PRIVATE KEY----- +b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtz +c2gtZWQyNTUxOQAAACANCWZw0K8UGXDQC32WBuyzwFtTGBBr1VuZ43uzpTBjIgAA +AKBATgCiQE4AogAAAAtzc2gtZWQyNTUxOQAAACANCWZw0K8UGXDQC32WBuyzwFtT +GBBr1VuZ43uzpTBjIgAAAEAAzBF1MPUxrs+ycpJh28zzo/F3m6WcKO+orsSbR5Lw +KQ0JZnDQrxQZcNALfZYG7LPAW1MYEGvVW5nje7OlMGMiAAAAFGVkMjU1MTkta2V5 +LTIwMTgxMTI3AQIDBAUGBwgJ +-----END OPENSSH PRIVATE KEY----- diff --git a/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj b/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj index 6f64c0048..4b63298e6 100644 --- a/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj +++ b/src/Renci.SshNet.Tests/Renci.SshNet.Tests.csproj @@ -717,6 +717,10 @@ + + + + - \ No newline at end of file + diff --git a/src/Renci.SshNet/PrivateKeyFile.cs b/src/Renci.SshNet/PrivateKeyFile.cs index de3b49a7f..a720a7c24 100644 --- a/src/Renci.SshNet/PrivateKeyFile.cs +++ b/src/Renci.SshNet/PrivateKeyFile.cs @@ -11,6 +11,8 @@ using Renci.SshNet.Security.Cryptography.Ciphers.Modes; using Renci.SshNet.Security.Cryptography.Ciphers.Paddings; using System.Diagnostics.CodeAnalysis; +using System.Linq; +using Renci.SshNet.Security.Cryptography; namespace Renci.SshNet { @@ -23,6 +25,7 @@ namespace Renci.SshNet /// /// /// Supports RSA and DSA private key in both OpenSSH and ssh.com format. + /// Also supports ED25519 private key from OpenSSH V1 key file. /// /// /// The following encryption algorithms are supported: @@ -203,6 +206,10 @@ private void Open(Stream privateKey, string passPhrase) HostKey = new KeyHostAlgorithm(_key.ToString(), _key); break; #endif + case "OPENSSH": + _key = ParseOpenSshV1Key(decryptedData, passPhrase); + HostKey = new KeyHostAlgorithm(_key.ToString(), _key); + break; case "SSH2 ENCRYPTED": var reader = new SshDataReader(decryptedData); var magicNumber = reader.ReadUInt32(); @@ -347,7 +354,145 @@ private static byte[] DecryptKey(CipherInfo cipherInfo, byte[] cipherData, strin return cipher.Decrypt(cipherData); } -#region IDisposable Members + /// + /// Parses an OpenSSH V1 key file (i.e. ED25519 key) according to the the key spec: + /// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key. + /// + /// the key file data (i.e. base64 encoded data between the header/footer) + /// passphrase or null if there isn't one + /// + private ED25519Key ParseOpenSshV1Key(byte [] keyFileData, string passPhrase) + { + var keyReader = new SshDataReader(keyFileData); + + //check magic header + var authMagic = Encoding.UTF8.GetBytes("openssh-key-v1\0"); + var keyHeaderBytes = keyReader.ReadBytes(authMagic.Length); + if (!authMagic.SequenceEqual(keyHeaderBytes)) + { + throw new SshException("This openssh key does not contain the 'openssh-key-v1' format magic header"); + } + + //cipher will be "aes256-cbc" if using a passphrase, "none" otherwise + var cipherName = keyReader.ReadString(Encoding.UTF8); + //key derivation function (kdf): bcrypt or nothing + var kdfName = keyReader.ReadString(Encoding.UTF8); + //kdf options length: 24 if passphrase, 0 if no passphrase + var kdfOptionsLen = (int)keyReader.ReadUInt32(); + byte[] salt = null; + int rounds = 0; + if (kdfOptionsLen > 0) + { + var saltLength = (int)keyReader.ReadUInt32(); + salt = keyReader.ReadBytes(saltLength); + rounds = (int)keyReader.ReadUInt32(); + } + + //number of public keys, only supporting 1 for now + var numberOfPublicKeys = (int)keyReader.ReadUInt32(); + if (numberOfPublicKeys != 1) + { + throw new SshException("At this time only one public key in the openssh key is supported."); + } + + //length of first public key section + keyReader.ReadUInt32(); + var keyType = keyReader.ReadString(Encoding.UTF8); + if(keyType != "ssh-ed25519") + { + throw new SshException("openssh key type: " + keyType + " is not supported"); + } + + //read public key + var publicKeyLength = (int)keyReader.ReadUInt32(); //32 + var publicKey = keyReader.ReadBytes(publicKeyLength); + + //possibly encrypted private key + var privateKeyLength = (int)keyReader.ReadUInt32(); + var privateKeyBytes = keyReader.ReadBytes(privateKeyLength); + + //decrypt private key if necessary + if (cipherName == "aes256-cbc") + { + if (string.IsNullOrEmpty(passPhrase)) + { + throw new SshPassPhraseNullOrEmptyException("Private key is encrypted but passphrase is empty."); + } + if (string.IsNullOrEmpty(kdfName) || kdfName != "bcrypt") + { + throw new SshException("kdf " + kdfName + " is not supported for openssh key file"); + } + + //inspired by the SSHj library (https://github.com/hierynomus/sshj) + //apply the kdf to derive a key and iv from the passphrase + var passPhraseBytes = Encoding.UTF8.GetBytes(passPhrase); + byte[] keyiv = new byte[48]; + new BCrypt().Pbkdf(passPhraseBytes, salt, rounds, keyiv); + byte[] key = new byte[32]; + Array.Copy(keyiv, 0, key, 0, 32); + byte[] iv = new byte[16]; + Array.Copy(keyiv, 32, iv, 0, 16); + + //now that we have the key/iv, use a cipher to decrypt the bytes + var cipher = new AesCipher(key, new CbcCipherMode(iv), new PKCS7Padding()); + privateKeyBytes = cipher.Decrypt(privateKeyBytes); + } + else if (cipherName != "none") + { + throw new SshException("cipher name " + cipherName + " for openssh key file is not supported"); + } + + //validate private key length + privateKeyLength = privateKeyBytes.Length; + if (privateKeyLength % 8 != 0) + { + throw new SshException("The private key section must be a multiple of the block size (8)"); + } + + //now parse the data we called the private key, it actually contains the public key again + //so we need to parse through it to get the private key bytes, plus there's some + //validation we need to do. + var privateKeyReader = new SshDataReader(privateKeyBytes); + + //check ints should match, they wouldn't match for example if the wrong passphrase was supplied + int checkInt1 = (int)privateKeyReader.ReadUInt32(); + int checkInt2 = (int)privateKeyReader.ReadUInt32(); + if (checkInt1 != checkInt2) + { + throw new SshException("The checkints differed, the openssh key was not correctly decoded."); + } + + //key type, we already know it is ssh-ed25519 + privateKeyReader.ReadString(Encoding.UTF8); + + //public key length/bytes (again) + var publicKeyLength2 = (int)privateKeyReader.ReadUInt32(); + privateKeyReader.ReadBytes(publicKeyLength2); + + //length of private and public key (64) + privateKeyReader.ReadUInt32(); + var unencryptedPrivateKey = privateKeyReader.ReadBytes(32); + //public key (again) + privateKeyReader.ReadBytes(32); + + //comment, we don't need this but we could log it, not sure if necessary + var comment = privateKeyReader.ReadString(Encoding.UTF8); + + //The list of privatekey/comment pairs is padded with the bytes 1, 2, 3, ... + //until the total length is a multiple of the cipher block size. + var padding = privateKeyReader.ReadBytes(); + for (int i = 0; i < padding.Length; i++) + { + if ((int)padding[i] != i + 1) + { + throw new SshException("Padding of openssh key format contained wrong byte at position: " + i); + } + } + + return new ED25519Key(publicKey.Reverse(), unencryptedPrivateKey); + } + + #region IDisposable Members private bool _isDisposed; @@ -415,6 +560,11 @@ public SshDataReader(byte[] data) return base.ReadBytes(length); } + public new byte[] ReadBytes() + { + return base.ReadBytes(); + } + /// /// Reads next mpint data type from internal buffer where length specified in bits. /// diff --git a/src/Renci.SshNet/Renci.SshNet.csproj b/src/Renci.SshNet/Renci.SshNet.csproj index 1983732fb..11c30be2c 100644 --- a/src/Renci.SshNet/Renci.SshNet.csproj +++ b/src/Renci.SshNet/Renci.SshNet.csproj @@ -439,6 +439,7 @@ + diff --git a/src/Renci.SshNet/Security/Cryptography/Bcrypt.cs b/src/Renci.SshNet/Security/Cryptography/Bcrypt.cs new file mode 100644 index 000000000..449ae27a6 --- /dev/null +++ b/src/Renci.SshNet/Security/Cryptography/Bcrypt.cs @@ -0,0 +1,950 @@ +// +// Copyright (c) 2006 Damien Miller +// Copyright (c) 2010 Ryan D. Emerle +// +// Permission to use, copy, modify, and distribute this software for any +// purpose with or without fee is hereby granted, provided that the above +// copyright notice and this permission notice appear in all copies. +// +// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + +using Renci.SshNet.Abstractions; +using System; +using System.Diagnostics; +using System.Security.Cryptography; +using System.Text; + +namespace Renci.SshNet.Security.Cryptography +{ + /// BCrypt implementation. + /// + /// + /// BCrypt implements OpenBSD-style Blowfish password hashing using the scheme described in + /// "A Future- + /// Adaptable Password Scheme" by Niels Provos and David Mazieres. + /// + /// + /// This password hashing system tries to thwart off-line password cracking using a + /// computationally-intensive hashing algorithm, based on Bruce Schneier's Blowfish cipher. + /// The work factor of the algorithm is parameterised, so it can be increased as computers + /// get faster. + /// + /// + /// Usage is really simple. To hash a password for the first time, call the method with a random salt, like this: + /// + /// string pw_hash = BCrypt.HashPassword(plain_password); + /// + /// To check whether a plaintext password matches one that has been hashed previously, + /// use the method: + /// + /// + /// if (BCrypt.Verify(candidate_password, stored_hash)) + /// Console.WriteLine("It matches"); + /// else + /// Console.WriteLine("It does not match"); + /// + /// + /// The method takes an optional parameter (workFactor) that + /// determines the computational complexity of the hashing: + /// + /// + /// string strong_salt = BCrypt.GenerateSalt(10); + /// string stronger_salt = BCrypt.GenerateSalt(12); + /// + /// + /// The amount of work increases exponentially (2^workFactor), so each increment is twice + /// as much work. The default workFactor is 10, and the valid range is 4 to 31. + /// + /// + public sealed class BCrypt + { + // BCrypt parameters + private const int GENSALT_DEFAULT_LOG2_ROUNDS = 10; + private const int BCRYPT_SALT_LEN = 16; + + // Blowfish parameters + private const int BLOWFISH_NUM_ROUNDS = 16; + + // Initial contents of key schedule + private static readonly uint[] _POrig = { + 0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, + 0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89, + 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c, + 0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, + 0x9216d5d9, 0x8979fb1b + }; + + private static readonly uint[] _SOrig = { + 0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, + 0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99, + 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16, + 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e, + 0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee, + 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013, + 0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, + 0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e, + 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60, + 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440, + 0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce, + 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a, + 0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, + 0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677, + 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193, + 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, + 0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88, + 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239, + 0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, + 0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0, + 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3, + 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, + 0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88, + 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe, + 0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, + 0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d, + 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b, + 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, + 0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba, + 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463, + 0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, + 0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09, + 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3, + 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, + 0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279, + 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8, + 0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, + 0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82, + 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db, + 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, + 0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0, + 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b, + 0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, + 0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8, + 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4, + 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, + 0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7, + 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c, + 0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, + 0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1, + 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299, + 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, + 0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477, + 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf, + 0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, + 0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af, + 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa, + 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, + 0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41, + 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915, + 0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, + 0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915, + 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664, + 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a, + 0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, + 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266, + 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1, + 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e, + 0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6, + 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1, + 0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, + 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1, + 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737, + 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8, + 0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff, + 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd, + 0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, + 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7, + 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41, + 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331, + 0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf, + 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af, + 0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, + 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87, + 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c, + 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2, + 0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16, + 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd, + 0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, + 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509, + 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e, + 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3, + 0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f, + 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a, + 0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, + 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960, + 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66, + 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28, + 0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802, + 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84, + 0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, + 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf, + 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14, + 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e, + 0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50, + 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7, + 0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, + 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281, + 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99, + 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696, + 0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128, + 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73, + 0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, + 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0, + 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105, + 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250, + 0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3, + 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285, + 0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, + 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061, + 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb, + 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e, + 0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735, + 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc, + 0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, + 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340, + 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20, + 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7, + 0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, + 0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068, + 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af, + 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840, + 0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45, + 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504, + 0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, + 0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb, + 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee, + 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6, + 0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42, + 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b, + 0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, + 0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb, + 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527, + 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b, + 0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33, + 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c, + 0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, + 0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc, + 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17, + 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564, + 0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b, + 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115, + 0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, + 0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728, + 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0, + 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e, + 0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37, + 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d, + 0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, + 0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b, + 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3, + 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb, + 0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d, + 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c, + 0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, + 0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9, + 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a, + 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe, + 0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d, + 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc, + 0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, + 0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61, + 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2, + 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9, + 0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2, + 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c, + 0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, + 0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633, + 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10, + 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169, + 0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52, + 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027, + 0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, + 0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62, + 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634, + 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76, + 0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24, + 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc, + 0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, + 0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c, + 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837, + 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0, + 0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, + 0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe, + 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b, + 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4, + 0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8, + 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6, + 0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, + 0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22, + 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4, + 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6, + 0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9, + 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59, + 0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, + 0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51, + 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28, + 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c, + 0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b, + 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28, + 0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, + 0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd, + 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a, + 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319, + 0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb, + 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f, + 0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, + 0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32, + 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680, + 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166, + 0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae, + 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb, + 0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, + 0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47, + 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370, + 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d, + 0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84, + 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048, + 0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, + 0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd, + 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9, + 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7, + 0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38, + 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f, + 0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, + 0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525, + 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1, + 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442, + 0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964, + 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e, + 0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, + 0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d, + 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f, + 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299, + 0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02, + 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc, + 0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, + 0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a, + 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6, + 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b, + 0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0, + 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060, + 0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, + 0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9, + 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f, + 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6 + }; + + // OpenBSD IV: "OxychromaticBlowfishSwatDynamite" in big endian + private static readonly uint[] _OpenBsdIv = new uint[] { + 0x4f787963, 0x68726f6d, 0x61746963, 0x426c6f77, + 0x66697368, 0x53776174, 0x44796e61, 0x6d697465, + }; + + // bcrypt IV: "OrpheanBeholderScryDoubt" + private static readonly uint[] _BfCryptCiphertext = { + 0x4f727068, 0x65616e42, 0x65686f6c, + 0x64657253, 0x63727944, 0x6f756274 + }; + + // Table for Base64 encoding + private static readonly char[] _Base64Code = { + '.', '/', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', + 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', + 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', + 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', + 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', + '6', '7', '8', '9' + }; + + // Table for Base64 decoding + private static readonly int[] _Index64 = { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, 0, 1, 54, 55, + 56, 57, 58, 59, 60, 61, 62, 63, -1, -1, + -1, -1, -1, -1, -1, 2, 3, 4, 5, 6, + 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, + 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, + -1, -1, -1, -1, -1, -1, 28, 29, 30, + 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, + 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, + 51, 52, 53, -1, -1, -1, -1, -1 + }; + + // Expanded Blowfish key + private uint[] _P; + private uint[] _S; + + /// + /// Hash a string using the OpenBSD bcrypt scheme and a salt generated by . + /// + /// Just an alias for HashPassword. + /// The string to hash. + /// The hashed string. + public static string HashString(string source) + { + return HashPassword(source); + } + + /// + /// Hash a string using the OpenBSD bcrypt scheme and a salt generated by . + /// + /// Just an alias for HashPassword. + /// The string to hash. + /// The log2 of the number of rounds of hashing to apply - the work + /// factor therefore increases as 2^workFactor. + /// The hashed string. + public static string HashString(string source, int workFactor) + { + return HashPassword(source, GenerateSalt(workFactor)); + } + + /// + /// Hash a password using the OpenBSD bcrypt scheme and a salt generated by . + /// + /// The password to hash. + /// The hashed password. + public static string HashPassword(string input) + { + return HashPassword(input, GenerateSalt()); + } + + /// + /// Hash a password using the OpenBSD bcrypt scheme and a salt generated by using the given . + /// + /// The password to hash. + /// The log2 of the number of rounds of hashing to apply - the work + /// factor therefore increases as 2^workFactor. + /// The hashed password. + public static string HashPassword(string input, int workFactor) + { + return HashPassword(input, GenerateSalt(workFactor)); + } + + /// Hash a password using the OpenBSD bcrypt scheme. + /// Thrown when one or more arguments have unsupported or + /// illegal values. + /// The password to hash. + /// the salt to hash with (perhaps generated using BCrypt.gensalt). + /// The hashed password + public static string HashPassword(string input, string salt) + { + if (input == null) + throw new ArgumentNullException("input"); + + if (string.IsNullOrEmpty(salt)) + throw new ArgumentException("Invalid salt", "salt"); + + // Determinthe starting offset and validate the salt + int startingOffset; + char minor = (char)0; + if (salt[0] != '$' || salt[1] != '2') + throw new SaltParseException("Invalid salt version"); + if (salt[2] == '$') + startingOffset = 3; + else + { + minor = salt[2]; + if (minor != 'a' || salt[3] != '$') + throw new SaltParseException("Invalid salt revision"); + startingOffset = 4; + } + + // Extract number of rounds + if (salt[startingOffset + 2] > '$') + throw new SaltParseException("Missing salt rounds"); + + // Extract details from salt + int logRounds = Convert.ToInt32(salt.Substring(startingOffset, 2)); + string extractedSalt = salt.Substring(startingOffset + 3, 22); + + byte[] inputBytes = Encoding.UTF8.GetBytes((input + (minor >= 'a' ? "\0" : ""))); + byte[] saltBytes = DecodeBase64(extractedSalt, BCRYPT_SALT_LEN); + + BCrypt bCrypt = new BCrypt(); + byte[] hashed = bCrypt.CryptRaw(inputBytes, saltBytes, logRounds); + + // Generate result string + StringBuilder result = new StringBuilder(); + result.Append("$2"); + if (minor >= 'a') + result.Append(minor); + result.AppendFormat("${0:00}$", logRounds); + result.Append(EncodeBase64(saltBytes, saltBytes.Length)); + result.Append(EncodeBase64(hashed, (_BfCryptCiphertext.Length * 4) - 1)); + return result.ToString(); + } + + /// + /// Generate a salt for use with the method. + /// + /// The log2 of the number of rounds of hashing to apply - the work + /// factor therefore increases as 2**workFactor. + /// A base64 encoded salt value. + public static string GenerateSalt(int workFactor) + { + if (workFactor < 4 || workFactor > 31) + throw new ArgumentOutOfRangeException("workFactor", workFactor, "The work factor must be between 4 and 31 (inclusive)"); + + byte[] rnd = new byte[BCRYPT_SALT_LEN]; + RandomNumberGenerator rng = RandomNumberGenerator.Create(); + rng.GetBytes(rnd); + + StringBuilder rs = new StringBuilder(); + rs.AppendFormat("$2a${0:00}$", workFactor); + rs.Append(EncodeBase64(rnd, rnd.Length)); + return rs.ToString(); + } + + /// + /// Generate a salt for use with the method + /// selecting a reasonable default for the number of hashing rounds to apply. + /// + /// A base64 encoded salt value. + public static string GenerateSalt() + { + return GenerateSalt(GENSALT_DEFAULT_LOG2_ROUNDS); + } + + /// + /// Verifies that the hash of the given matches the provided + /// + /// + /// The text to verify. + /// The previously-hashed password. + /// true if the passwords match, false otherwise. + public static bool Verify(string text, string hash) + { + return hash == HashPassword(text, hash); + } + + /// + /// Encode a byte array using bcrypt's slightly-modified base64 encoding scheme. Note that this + /// is *not* compatible with the standard MIME-base64 encoding. + /// + /// Thrown when one or more arguments have unsupported or + /// illegal values. + /// The byte array to encode. + /// The number of bytes to encode. + /// Base64-encoded string. + private static string EncodeBase64(byte[] byteArray, int length) + { + if (length <= 0 || length > byteArray.Length) + throw new ArgumentException("Invalid length", "length"); + + int off = 0; + StringBuilder rs = new StringBuilder(); + while (off < length) + { + int c1 = byteArray[off++] & 0xff; + rs.Append(_Base64Code[(c1 >> 2) & 0x3f]); + c1 = (c1 & 0x03) << 4; + if (off >= length) + { + rs.Append(_Base64Code[c1 & 0x3f]); + break; + } + int c2 = byteArray[off++] & 0xff; + c1 |= (c2 >> 4) & 0x0f; + rs.Append(_Base64Code[c1 & 0x3f]); + c1 = (c2 & 0x0f) << 2; + if (off >= length) + { + rs.Append(_Base64Code[c1 & 0x3f]); + break; + } + c2 = byteArray[off++] & 0xff; + c1 |= (c2 >> 6) & 0x03; + rs.Append(_Base64Code[c1 & 0x3f]); + rs.Append(_Base64Code[c2 & 0x3f]); + } + return rs.ToString(); + } + + /// + /// Decode a string encoded using bcrypt's base64 scheme to a byte array. Note that this is *not* + /// compatible with the standard MIME-base64 encoding. + /// + /// Thrown when one or more arguments have unsupported or + /// illegal values. + /// The string to decode. + /// The maximum bytes to decode. + /// The decoded byte array. + private static byte[] DecodeBase64(string encodedstring, int maximumBytes) + { + int position = 0, + sourceLength = encodedstring.Length, + outputLength = 0; + + if (maximumBytes <= 0) + throw new ArgumentException("Invalid maximum bytes value", "maximumBytes"); + + // TODO: update to use a List - it's only ever 16 bytes, so it's not a big deal + StringBuilder rs = new StringBuilder(); + while (position < sourceLength - 1 && outputLength < maximumBytes) + { + int c1 = Char64(encodedstring[position++]); + int c2 = Char64(encodedstring[position++]); + if (c1 == -1 || c2 == -1) + break; + + rs.Append((char)((c1 << 2) | ((c2 & 0x30) >> 4))); + if (++outputLength >= maximumBytes || position >= sourceLength) + break; + + int c3 = Char64(encodedstring[position++]); + if (c3 == -1) + break; + + rs.Append((char)(((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2))); + if (++outputLength >= maximumBytes || position >= sourceLength) + break; + + int c4 = Char64(encodedstring[position++]); + rs.Append((char)(((c3 & 0x03) << 6) | c4)); + + ++outputLength; + } + + byte[] ret = new byte[outputLength]; + for (position = 0; position < outputLength; position++) + ret[position] = (byte)rs[position]; + return ret; + } + + /// + /// Look up the 3 bits base64-encoded by the specified character, range-checking against + /// conversion table. + /// + /// The base64-encoded value. + /// The decoded value of x. + private static int Char64(char character) + { + if (character < 0 || character > _Index64.Length) + return -1; + return _Index64[character]; + } + + /// Blowfish encipher a single 64-bit block encoded as two 32-bit halves. + /// An array containing the two 32-bit half blocks. + /// The position in the array of the blocks. + private void Encipher(uint[] blockArray, int offset) + { + uint round, + n, + block = blockArray[offset], + r = blockArray[offset + 1]; + + block ^= _P[0]; + for (round = 0; round <= BLOWFISH_NUM_ROUNDS - 2;) + { + // Feistel substitution on left word + n = _S[(block >> 24) & 0xff]; + n += _S[0x100 | ((block >> 16) & 0xff)]; + n ^= _S[0x200 | ((block >> 8) & 0xff)]; + n += _S[0x300 | (block & 0xff)]; + r ^= n ^ _P[++round]; + + // Feistel substitution on right word + n = _S[(r >> 24) & 0xff]; + n += _S[0x100 | ((r >> 16) & 0xff)]; + n ^= _S[0x200 | ((r >> 8) & 0xff)]; + n += _S[0x300 | (r & 0xff)]; + block ^= n ^ _P[++round]; + } + blockArray[offset] = r ^ _P[BLOWFISH_NUM_ROUNDS + 1]; + blockArray[offset + 1] = block; + } + + /// Cycically extract a word of key material. + /// The string to extract the data from. + /// [in,out] The current offset. + /// The next word of material from data. + private static uint StreamToWord(byte[] data, ref int offset) + { + int i; + uint word = 0; + + for (i = 0; i < 4; i++) + { + word = (word << 8) | (uint)(data[offset] & 0xff); + offset = (offset + 1) % data.Length; + } + return word; + } + + /// Initializes the Blowfish key schedule. + private void InitializeKey() + { + _P = new uint[_POrig.Length]; + _S = new uint[_SOrig.Length]; + Array.Copy(_POrig, _P, _POrig.Length); + Array.Copy(_SOrig, _S, _SOrig.Length); + } + + /// Key the Blowfish cipher. + /// The key byte array. + private void Key(byte[] keyBytes) + { + int i; + int koffp = 0; + uint[] lr = { 0, 0 }; + int plen = _P.Length, slen = _S.Length; + + for (i = 0; i < plen; i++) + _P[i] = _P[i] ^ StreamToWord(keyBytes, ref koffp); + + for (i = 0; i < plen; i += 2) + { + Encipher(lr, 0); + _P[i] = lr[0]; + _P[i + 1] = lr[1]; + } + + for (i = 0; i < slen; i += 2) + { + Encipher(lr, 0); + _S[i] = lr[0]; + _S[i + 1] = lr[1]; + } + } + + /// + /// Perform the "enhanced key schedule" step described by Provos and Mazieres in "A Future- + /// Adaptable Password Scheme" http://www.openbsd.org/papers/bcrypt-paper.ps. + /// + /// Salt byte array. + /// Input byte array. + private void EKSKey(byte[] saltBytes, byte[] inputBytes) + { + int i; + int passwordOffset = 0, + saltOffset = 0; + uint[] lr = { 0, 0 }; + int plen = _P.Length, slen = _S.Length; + + for (i = 0; i < plen; i++) + _P[i] = _P[i] ^ StreamToWord(inputBytes, ref passwordOffset); + + for (i = 0; i < plen; i += 2) + { + lr[0] ^= StreamToWord(saltBytes, ref saltOffset); + lr[1] ^= StreamToWord(saltBytes, ref saltOffset); + Encipher(lr, 0); + _P[i] = lr[0]; + _P[i + 1] = lr[1]; + } + + for (i = 0; i < slen; i += 2) + { + lr[0] ^= StreamToWord(saltBytes, ref saltOffset); + lr[1] ^= StreamToWord(saltBytes, ref saltOffset); + Encipher(lr, 0); + _S[i] = lr[0]; + _S[i + 1] = lr[1]; + } + } + + /// Perform the central hashing step in the bcrypt scheme. + /// Thrown when one or more arguments have unsupported or + /// illegal values. + /// The input byte array to hash. + /// The salt byte array to hash with. + /// The binary logarithm of the number of rounds of hashing to apply. + /// A byte array containing the hashed result. + private byte[] CryptRaw(byte[] inputBytes, byte[] saltBytes, int logRounds) + { + uint[] cdata = new uint[_BfCryptCiphertext.Length]; + Array.Copy(_BfCryptCiphertext, cdata, _BfCryptCiphertext.Length); + int clen = cdata.Length; + + if (logRounds < 4 || logRounds > 31) + throw new ArgumentException("Bad number of rounds", "logRounds"); + + if (saltBytes.Length != BCRYPT_SALT_LEN) + throw new ArgumentException("Bad salt Length", "saltBytes"); + + uint rounds = 1u << logRounds; + Debug.Assert(rounds > 0, "Rounds must be > 0"); // We overflowed rounds at 31 - added safety check + + InitializeKey(); + EKSKey(saltBytes, inputBytes); + + for (int i = 0; i < rounds; i++) + { + Key(inputBytes); + Key(saltBytes); + } + + for (int i = 0; i < 64; i++) + { + for (int j = 0; j < (clen >> 1); j++) + Encipher(cdata, j << 1); + } + + byte[] ret = new byte[clen * 4]; + for (int i = 0, j = 0; i < clen; i++) + { + ret[j++] = (byte)((cdata[i] >> 24) & 0xff); + ret[j++] = (byte)((cdata[i] >> 16) & 0xff); + ret[j++] = (byte)((cdata[i] >> 8) & 0xff); + ret[j++] = (byte)(cdata[i] & 0xff); + } + return ret; + } + + /** + * Compatibility with new OpenBSD function. + * Ported from SSHJ library (https://github.com/hierynomus/sshj) + */ + public void Hash(byte[] hpass, byte[] hsalt, byte[] output) + { + InitializeKey(); + EKSKey(hsalt, hpass); + for (int i = 0; i < 64; i++) + { + Key(hsalt); + Key(hpass); + } + + uint[] buf = new uint[_OpenBsdIv.Length]; + Array.Copy(_OpenBsdIv, 0, buf, 0, _OpenBsdIv.Length); + for (int i = 0; i < 8; i += 2) + { + for (int j = 0; j < 64; j++) + { + Encipher(buf, i); + } + } + + for (int i = 0, j = 0; i < buf.Length; i++) + { + // Output of this is little endian + output[j++] = (byte)(buf[i] & 0xff); + output[j++] = (byte)((buf[i] >> 8) & 0xff); + output[j++] = (byte)((buf[i] >> 16) & 0xff); + output[j++] = (byte)((buf[i] >> 24) & 0xff); + } + } + + /// + /// Applies the Bcrypt kdf to derive a key and iv from the passphrase, + /// the key/iv are returned in the output variable. + /// Ported from the SSHJ library. https://github.com/hierynomus/sshj + /// + /// + /// + /// + /// + public void Pbkdf(byte[] password, byte[] salt, int rounds, byte[] output) + { + using (var sha512 = CryptoAbstraction.CreateSHA512()) + { + int nblocks = (output.Length + 31) / 32; + byte[] hpass = sha512.ComputeHash(password); + + byte[] hsalt = new byte[64]; + byte[] block_b = new byte[4]; + byte[] outBytes = new byte[32]; + byte[] tmp = new byte[32]; + for (int block = 1; block <= nblocks; block++) + { + // Block count is in big endian + block_b[0] = (byte)((block >> 24) & 0xFF); + block_b[1] = (byte)((block >> 16) & 0xFF); + block_b[2] = (byte)((block >> 8) & 0xFF); + block_b[3] = (byte)(block & 0xFF); + + hsalt = sha512.ComputeHash(AppendArrays(salt, block_b)); + Hash(hpass, hsalt, outBytes); + Array.Copy(outBytes, 0, tmp, 0, outBytes.Length); + + for (int round = 1; round < rounds; round++) + { + hsalt = sha512.ComputeHash(tmp); + Hash(hpass, hsalt, tmp); + + for (int i = 0; i < tmp.Length; i++) + { + outBytes[i] ^= tmp[i]; + } + } + + for (int i = 0; i < outBytes.Length; i++) + { + int idx = i * nblocks + (block - 1); + if (idx < output.Length) + { + output[idx] = outBytes[i]; + } + } + } + } + } + + /// + /// Appends multiple byte arrays into one array. + /// + /// + /// + /// + private byte[] AppendArrays(byte[] b1, params byte[][] others) + { + //from https://stackoverflow.com/questions/46534429/how-to-convert-java-messagedigest-with-two-update-statements-to-c-sharp + int n = b1.Length; + foreach (var other in others) + { + n += other.Length; + } + + var result = new byte[n]; + + n = 0; + Array.Copy(b1, 0, result, n, b1.Length); + n += b1.Length; + foreach (var other in others) + { + Array.Copy(other, 0, result, n, other.Length); + n += other.Length; + } + + return result; + } + + /// Exception for signalling parse errors. + public class SaltParseException : Exception + { + /// Default constructor. + public SaltParseException() + { + } + + /// Initializes a new instance of . + /// The message. + public SaltParseException(string message) + : base(message) + { + } + + /// Initializes a new instance of . + /// The message. + /// The inner exception. + public SaltParseException(string message, Exception innerException) + : base(message, innerException) + { + } + } + } +}