private void _UnprotectKey()
{
if (!SodiumCore.IsRunningOnMono())
{
ProtectedMemory.Unprotect(_privateKey, MemoryProtectionScope.SameProcess);
}
}
/// <summary>Converts a hex-encoded string to a byte array.</summary>
/// <param name="hex">Hex-encoded data.</param>
/// <returns>A byte array of the decoded string.</returns>
/// <exception cref="Exception"></exception>
public static byte[] HexToBinary(string hex)
{
const string IGNORED_CHARS = ":- ";
var arr = new byte[hex.Length >> 1];
var bin = Marshal.AllocHGlobal(arr.Length);
int binLength;
//we call sodium_hex2bin with some chars to be ignored
var h = DynamicInvoke.GetDynamicInvoke <_Hex2Bin>("sodium_hex2bin", SodiumCore.LibraryName());
var ret = h(bin, arr.Length, hex, hex.Length, IGNORED_CHARS, out binLength, null);
Marshal.Copy(bin, arr, 0, binLength);
Marshal.FreeHGlobal(bin);
if (ret != 0)
{
throw new Exception("Internal error, decoding failed.");
}
//remove the trailing nulls from the array, if there were some format characters in the hex string before
if (arr.Length != binLength)
{
var tmp = new byte[binLength];
Array.Copy(arr, 0, tmp, 0, binLength);
return(tmp);
}
return(arr);
}
/// <summary>Returns the hash in a string format, which includes the generated salt.</summary>
/// <param name="password">The password.</param>
/// <param name="opsLimit">Represents a maximum amount of computations to perform.</param>
/// <param name="memLimit">Is the maximum amount of RAM that the function will use, in bytes.</param>
/// <returns>Returns an zero-terminated ASCII encoded string of the computed password and hash.</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="OutOfMemoryException"></exception>
public static string ScryptHashString(string password, long opsLimit, int memLimit)
{
if (password == null)
{
throw new ArgumentNullException("password", "Password cannot be null");
}
if (opsLimit <= 0)
{
throw new ArgumentOutOfRangeException("opsLimit", "opsLimit cannot be zero or negative");
}
if (memLimit <= 0)
{
throw new ArgumentOutOfRangeException("memLimit", "memLimit cannot be zero or negative");
}
var buffer = new byte[SCRYPT_SALSA208_SHA256_STRBYTES];
var pass = Encoding.UTF8.GetBytes(password);
SodiumCore.Init();
var ret = SodiumLibrary.crypto_pwhash_scryptsalsa208sha256_str(buffer, pass, pass.Length, opsLimit, memLimit);
if (ret != 0)
{
throw new OutOfMemoryException("Internal error, hash failed (usually because the operating system refused to allocate the amount of requested memory).");
}
return(Encoding.UTF8.GetString(buffer));
}
/// <summary>Creates a Box</summary>
/// <param name="message">The message.</param>
/// <param name="nonce">The 24 byte nonce.</param>
/// <param name="secretKey">The secret key to sign message with.</param>
/// <param name="publicKey">The recipient's public key.</param>
/// <returns>The encrypted message.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="NonceOutOfRangeException"></exception>
/// <exception cref="CryptographicException"></exception>
public static byte[] Create(byte[] message, byte[] nonce, byte[] secretKey, byte[] publicKey)
{
//validate the length of the secret key
if (secretKey == null || secretKey.Length != SecretKeyBytes)
{
throw new KeyOutOfRangeException("secretKey", (secretKey == null) ? 0 : secretKey.Length,
string.Format("key must be {0} bytes in length.", SecretKeyBytes));
}
//validate the length of the public key
if (publicKey == null || publicKey.Length != PublicKeyBytes)
{
throw new KeyOutOfRangeException("publicKey", (publicKey == null) ? 0 : secretKey.Length,
string.Format("key must be {0} bytes in length.", PublicKeyBytes));
}
//validate the length of the nonce
if (nonce == null || nonce.Length != NONCE_BYTES)
{
throw new NonceOutOfRangeException("nonce", (nonce == null) ? 0 : nonce.Length,
string.Format("nonce must be {0} bytes in length.", NONCE_BYTES));
}
var buffer = new byte[message.Length + MAC_BYTES];
var create = DynamicInvoke.GetDynamicInvoke <_Create>("crypto_box_easy", SodiumCore.LibraryName());
var ret = create(buffer, message, message.Length, nonce, publicKey, secretKey);
if (ret != 0)
{
throw new CryptographicException("Failed to create SecretBox");
}
return(buffer);
}
/// <summary>Returns the hash in a string format, which includes the generated salt.</summary>
/// <param name="password">The password.</param>
/// <param name="opsLimit">Represents a maximum amount of computations to perform.</param>
/// <param name="memLimit">Is the maximum amount of RAM that the function will use, in bytes.</param>
/// <returns>Returns an zero-terminated ASCII encoded string of the computed password and hash.</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="OutOfMemoryException"></exception>
public static string ArgonHashString(string password, long opsLimit, int memLimit)
{
if (password == null)
{
throw new ArgumentNullException("password", "Password cannot be null");
}
if (opsLimit < 3)
{
throw new ArgumentOutOfRangeException("opsLimit",
"opsLimit the number of passes, has to be at least 3");
}
if (memLimit <= 0)
{
throw new ArgumentOutOfRangeException("memLimit", "memLimit cannot be zero or negative");
}
byte[] buffer = new byte[ARGON_STRBYTES];
byte[] pass = Encoding.UTF8.GetBytes(password);
SodiumCore.Init();
int ret = SodiumLibrary.crypto_pwhash_str(buffer, pass, pass.GetLongLength(0), opsLimit, memLimit);
if (ret != 0)
{
throw new OutOfMemoryException(
"Internal error, hash failed (usually because the operating system refused to allocate the amount of requested memory).");
}
return(Encoding.UTF8.GetString(buffer));
}
/// <summary>
/// Encrypts a message with an authentication tag and additional data.
/// </summary>
/// <param name="message">The message to be encrypted.</param>
/// <param name="nonce">The 8 byte nonce.</param>
/// <param name="key">The 32 byte key.</param>
/// <param name="additionalData">The additional data; may be null, otherwise between 0 and 16 bytes.</param>
/// <returns>The encrypted message with additional data.</returns>
/// <remarks>The nonce should never ever be reused with the same key.</remarks>
/// <remarks>The recommended way to generate it is to use GenerateNonce() for the first message, and increment it for each subsequent message using the same key.</remarks>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="NonceOutOfRangeException"></exception>
/// <exception cref="AdditionalDataOutOfRangeException"></exception>
/// <exception cref="CryptographicException"></exception>
public static byte[] Encrypt(byte[] message, byte[] nonce, byte[] key, byte[] additionalData = null)
{
//additionalData can be null
if (additionalData == null)
{
additionalData = new byte[0x00];
}
//validate the length of the key
if (key == null || key.Length != KEYBYTES)
{
throw new KeyOutOfRangeException("key", (key == null) ? 0 : key.Length,
string.Format("key must be {0} bytes in length.", KEYBYTES));
}
//validate the length of the nonce
if (nonce == null || nonce.Length != NPUBBYTES)
{
throw new NonceOutOfRangeException("nonce", (nonce == null) ? 0 : nonce.Length,
string.Format("nonce must be {0} bytes in length.", NPUBBYTES));
}
//validate the length of the additionalData
if (additionalData.Length > ABYTES || additionalData.Length < 0)
{
throw new AdditionalDataOutOfRangeException(
string.Format("additionalData must be between {0} and {1} bytes in length.", 0, ABYTES));
}
var cipher = new byte[message.Length + ABYTES];
var bin = Marshal.AllocHGlobal(cipher.Length);
long cipherLength;
var encrypt = DynamicInvoke.GetDynamicInvoke <_Encrypt>("crypto_aead_chacha20poly1305_encrypt",
SodiumCore.LibraryName());
var ret = encrypt(bin, out cipherLength, message, message.Length, additionalData, additionalData.Length, null,
nonce, key);
Marshal.Copy(bin, cipher, 0, (int)cipherLength);
Marshal.FreeHGlobal(bin);
if (ret != 0)
{
throw new CryptographicException("Error encrypting message.");
}
if (cipher.Length == cipherLength)
{
return(cipher);
}
//remove the trailing nulls from the array
var tmp = new byte[cipherLength];
Array.Copy(cipher, 0, tmp, 0, cipherLength);
return(tmp);
}
/// <summary>Hashes a byte array using the default algorithm (This is what you want to use)</summary>
/// <param name="message">The message.</param>
/// <returns></returns>
public static byte[] Hash(byte[] message)
{
var buffer = new byte[SHA512_BYTES];
var hash = DynamicInvoke.GetDynamicInvoke <_CryptoHash>("crypto_hash", SodiumCore.LibraryName());
hash(buffer, message, message.Length);
return(buffer);
}
/// <summary>Takes a byte array and returns a hex-encoded string.</summary>
/// <param name="data">Data to be encoded.</param>
/// <returns>Hex-encoded string, lodercase.</returns>
/// <exception cref="OverflowException"></exception>
public static string BinaryToHex(byte[] data)
{
var hex = new byte[data.Length * 2 + 1];
var b = DynamicInvoke.GetDynamicInvoke <_Bin2Hex>("sodium_bin2hex", SodiumCore.LibraryName());
var ret = b(hex, hex.Length, data, data.Length);
if (ret == IntPtr.Zero)
{
throw new OverflowException("Internal error, encoding failed.");
}
return(Marshal.PtrToStringAnsi(ret));
}
public static byte[] ScryptHashLowLevel(byte[] password, byte[] salt, long N, int R, int P, uint bufferLength = SCRYPT_SALSA208_SHA256_STRBYTES)
{
var buffer = new byte[bufferLength];
SodiumCore.Init();
var ret = SodiumLibrary.crypto_pwhash_scryptsalsa208sha256_ll(password, password.Length, salt, salt.Length, N, R, P, buffer, buffer.Length);
if (ret != 0)
{
throw new OutOfMemoryException("Internal error, hash failed (usually because the operating system refused to allocate the amount of requested memory).");
}
return(buffer);
}
/// <summary>
/// Derives a secret key of any size from a password and a salt.
/// </summary>
/// <param name="password">The password.</param>
/// <param name="salt">The salt.</param>
/// <param name="opsLimit">Represents a maximum amount of computations to perform.</param>
/// <param name="memLimit">Is the maximum amount of RAM that the function will use, in bytes.</param>
/// <param name="outputLength">The length of the computed output array.</param>
/// <returns>Returns a byte array of the given size.</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="SaltOutOfRangeException"></exception>
/// <exception cref="OutOfMemoryException"></exception>
public static byte[] ArgonHashBinary(byte[] password, byte[] salt, long opsLimit, int memLimit,
long outputLength = ARGON_SALTBYTES)
{
if (password == null)
{
throw new ArgumentNullException("password", "Password cannot be null");
}
if (salt == null)
{
throw new ArgumentNullException("salt", "Salt cannot be null");
}
if (salt.Length != ARGON_SALTBYTES)
{
throw new SaltOutOfRangeException(string.Format("Salt must be {0} bytes in length.", ARGON_SALTBYTES));
}
if (opsLimit < 2)
{
throw new ArgumentOutOfRangeException("opsLimit",
"opsLimit the number of passes, has to be at least 3");
}
if (memLimit <= 0)
{
throw new ArgumentOutOfRangeException("memLimit", "memLimit cannot be zero or negative");
}
if (outputLength <= 0)
{
throw new ArgumentOutOfRangeException("outputLength", "OutputLength cannot be zero or negative");
}
byte[] buffer = new byte[outputLength];
SodiumCore.Init();
int ret = SodiumLibrary.crypto_pwhash(buffer, buffer.Length, password, password.GetLongLength(0), salt,
opsLimit, memLimit, ARGON_ALGORITHM_DEFAULT);
if (ret != 0)
{
throw new OutOfMemoryException(
"Internal error, hash failed (usually because the operating system refused to allocate the amount of requested memory).");
}
return(buffer);
}
/// <summary>Signs a message with HMAC-SHA512-256.</summary>
/// <param name="message">The message.</param>
/// <param name="key">The 32 byte key.</param>
/// <returns>32 byte authentication code.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
public static byte[] Sign(byte[] message, byte[] key)
{
//validate the length of the key
if (key == null || key.Length != KEY_BYTES)
{
throw new KeyOutOfRangeException("key", (key == null) ? 0 : key.Length,
string.Format("key must be {0} bytes in length.", KEY_BYTES));
}
var buffer = new byte[BYTES];
var sign = DynamicInvoke.GetDynamicInvoke <_Sign>("crypto_auth", SodiumCore.LibraryName());
sign(buffer, message, message.Length, key);
return(buffer);
}
/// <summary>Verifies that a hash generated with ScryptHashString matches the supplied password.</summary>
/// <param name="hash">The hash.</param>
/// <param name="password">The password.</param>
/// <returns><c>true</c> on success; otherwise, <c>false</c>.</returns>
/// <exception cref="ArgumentNullException"></exception>
public static bool ScryptHashStringVerify(byte[] hash, byte[] password)
{
if (password == null)
{
throw new ArgumentNullException(nameof(password), "Password cannot be null");
}
if (hash == null)
{
throw new ArgumentNullException(nameof(hash), "Hash cannot be null");
}
SodiumCore.Init();
var ret = SodiumLibrary.crypto_pwhash_scryptsalsa208sha256_str_verify(hash, password, password.Length);
return(ret == 0);
}
/// <summary>
/// Derives a secret key of any size from a password and a salt.
/// </summary>
/// <param name="password">The password.</param>
/// <param name="salt">The salt.</param>
/// <param name="opsLimit">Represents a maximum amount of computations to perform.</param>
/// <param name="memLimit">Is the maximum amount of RAM that the function will use, in bytes.</param>
/// <param name="outputLength">The length of the computed output array.</param>
/// <param name="alg">Argon Algorithm</param>
/// <returns>Returns a byte array of the given size.</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="SaltOutOfRangeException"></exception>
/// <exception cref="OutOfMemoryException"></exception>
public static byte[] ArgonHashBinary(byte[] password, byte[] salt, long opsLimit, int memLimit, long outputLength = ARGON_SALTBYTES,
ArgonAlgorithm alg = ArgonAlgorithm.Argon_2I13)
{
if (password == null)
{
throw new ArgumentNullException(nameof(password), "Password cannot be null");
}
if (salt == null)
{
throw new ArgumentNullException(nameof(salt), "Salt cannot be null");
}
if (salt.Length != ARGON_SALTBYTES)
{
throw new SaltOutOfRangeException($"Salt must be {ARGON_SALTBYTES} bytes in length.");
}
if (opsLimit < 3)
{
throw new ArgumentOutOfRangeException(nameof(opsLimit), "opsLimit the number of passes, has to be at least 3");
}
if (memLimit <= 0)
{
throw new ArgumentOutOfRangeException(nameof(memLimit), "memLimit cannot be zero or negative");
}
if (outputLength <= 0)
{
throw new ArgumentOutOfRangeException(nameof(outputLength), "OutputLength cannot be zero or negative");
}
var buffer = new byte[outputLength];
SodiumCore.Init();
var ret = SodiumLibrary.crypto_pwhash(buffer, buffer.Length, password, password.Length, salt, opsLimit, memLimit, (int)alg);
if (ret != 0)
{
throw new OutOfMemoryException("Internal error, hash failed (usually because the operating system refused to allocate the amount of requested memory).");
}
return(buffer);
}
/// <summary>
/// Derives a secret key of any size from a password and a salt.
/// </summary>
/// <param name="password">The password.</param>
/// <param name="salt">The salt.</param>
/// <param name="opsLimit">Represents a maximum amount of computations to perform.</param>
/// <param name="memLimit">Is the maximum amount of RAM that the function will use, in bytes.</param>
/// <param name="outputLength">The length of the computed output array.</param>
/// <returns>Returns a byte array of the given size.</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="SaltOutOfRangeException"></exception>
/// <exception cref="OutOfMemoryException"></exception>
public static byte[] ScryptHashBinary(byte[] password, byte[] salt, long opsLimit, int memLimit, long outputLength = SCRYPT_SALSA208_SHA256_SALTBYTES)
{
if (password == null)
{
throw new ArgumentNullException(nameof(password), "Password cannot be null");
}
if (salt == null)
{
throw new ArgumentNullException(nameof(salt), "Salt cannot be null");
}
if (salt.Length != SCRYPT_SALSA208_SHA256_SALTBYTES)
{
throw new SaltOutOfRangeException($"Salt must be {SCRYPT_SALSA208_SHA256_SALTBYTES} bytes in length.");
}
if (opsLimit <= 0)
{
throw new ArgumentOutOfRangeException(nameof(opsLimit), "opsLimit cannot be zero or negative");
}
if (memLimit <= 0)
{
throw new ArgumentOutOfRangeException(nameof(memLimit), "memLimit cannot be zero or negative");
}
if (outputLength < 16)
{
throw new ArgumentOutOfRangeException(nameof(outputLength), "OutputLength cannot be less than 16 bytes");
}
var buffer = new byte[outputLength];
SodiumCore.Init();
var ret = SodiumLibrary.crypto_pwhash_scryptsalsa208sha256(buffer, buffer.Length, password, password.Length, salt, opsLimit, memLimit);
if (ret != 0)
{
throw new OutOfMemoryException("Internal error, hash failed (usually because the operating system refused to allocate the amount of requested memory).");
}
return(buffer);
}
/// <summary>
/// Checks if the current password hash needs rehashing
/// </summary>
/// <param name="password">Password that needs rehashing</param>
/// <param name="opsLimit"></param>
/// <param name="memLimit"></param>
/// <returns></returns>
public static bool ArgonPasswordNeedsRehash(byte[] password, long opsLimit, int memLimit)
{
if (password == null)
{
throw new ArgumentNullException("password", "Password cannot be null");
}
SodiumCore.Init();
int status = SodiumLibrary.crypto_pwhash_str_needs_rehash(password, opsLimit, memLimit);
if (status == -1)
{
throw new InvalidArgonPasswordString();
}
return(status == 1);
}
/// <summary>Signs a message with Ed25519.</summary>
/// <param name="message">The message.</param>
/// <param name="key">The 64 byte private key.</param>
/// <returns>Signed message.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
public static byte[] Sign(byte[] message, byte[] key)
{
//validate the length of the key
if (key == null || key.Length != SECRET_KEY_BYTES)
{
throw new KeyOutOfRangeException("key", (key == null) ? 0 : key.Length,
string.Format("key must be {0} bytes in length.", SECRET_KEY_BYTES));
}
var buffer = new byte[message.Length + BYTES];
long bufferLength = 0;
var mes = DynamicInvoke.GetDynamicInvoke <_Sign>("crypto_sign", SodiumCore.LibraryName());
mes(buffer, ref bufferLength, message, message.Length, key);
var final = new byte[bufferLength];
Array.Copy(buffer, 0, final, 0, bufferLength);
return(final);
}
/// <summary>Generates a random 8 byte nonce.</summary>
/// <returns>Returns a byte array with 8 random bytes</returns>
public static byte[] GenerateNonceXChaCha20()
{
return(SodiumCore.GetRandomBytes(XCHACHA20_NONCEBYTES));
}
/// <summary>Generates a random 24 byte nonce.</summary>
/// <returns>Returns a byte array with 24 random bytes</returns>
public static byte[] GenerateNonce()
{
return(SodiumCore.GetRandomBytes(XSALSA20_NONCE_BYTES));
}
/// <summary>Detect if the current CPU supports the required instructions (SSSE3, aesni, pcmul).</summary>
/// <returns><c>true</c> if the CPU supports the necessary instructions, otherwise <c>false</c></returns>
/// <remarks>Use <see cref="SecretAead" /> if portability is required.</remarks>
public static bool IsAvailable()
{
SodiumCore.Init();
return(SodiumLibrary.crypto_aead_aes256gcm_is_available() != 0);
}
/// <summary>Opens a detached Box</summary>
/// <param name="cipherText">The cipherText.</param>
/// <param name="mac">The 16 byte mac.</param>
/// <param name="nonce">The 24 byte nonce.</param>
/// <param name="secretKey">The recipient's secret key.</param>
/// <param name="publicKey">The sender's public key.</param>
/// <returns>The decrypted message.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="MacOutOfRangeException"></exception>
/// <exception cref="NonceOutOfRangeException"></exception>
/// <exception cref="CryptographicException"></exception>
public static byte[] OpenDetached(byte[] cipherText, byte[] mac, byte[] nonce, byte[] secretKey, byte[] publicKey)
{
//validate the length of the secret key
if (secretKey == null || secretKey.Length != SecretKeyBytes)
{
throw new KeyOutOfRangeException("secretKey", (secretKey == null) ? 0 : secretKey.Length,
string.Format("key must be {0} bytes in length.", SecretKeyBytes));
}
//validate the length of the public key
if (publicKey == null || publicKey.Length != PublicKeyBytes)
{
throw new KeyOutOfRangeException("publicKey", (publicKey == null) ? 0 : secretKey.Length,
string.Format("key must be {0} bytes in length.", PublicKeyBytes));
}
//validate the length of the mac
if (mac == null || mac.Length != MAC_BYTES)
{
throw new MacOutOfRangeException("mac", (mac == null) ? 0 : mac.Length,
string.Format("mac must be {0} bytes in length.", MAC_BYTES));
}
//validate the length of the nonce
if (nonce == null || nonce.Length != NONCE_BYTES)
{
throw new NonceOutOfRangeException("nonce", (nonce == null) ? 0 : nonce.Length,
string.Format("nonce must be {0} bytes in length.", NONCE_BYTES));
}
var buffer = new byte[cipherText.Length];
var open = DynamicInvoke.GetDynamicInvoke <_OpenDetache>("crypto_box_open_detached", SodiumCore.LibraryName());
var ret = open(buffer, cipherText, mac, cipherText.Length, nonce, secretKey, publicKey);
if (ret != 0)
{
throw new CryptographicException("Failed to open detached Box");
}
return(buffer);
}
/// <summary>Opens a Box</summary>
/// <param name="cipherText"></param>
/// <param name="nonce">The 24 byte nonce.</param>
/// <param name="secretKey">The recipient's secret key.</param>
/// <param name="publicKey">The sender's public key.</param>
/// <returns>The decrypted message.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="NonceOutOfRangeException"></exception>
/// <exception cref="CryptographicException"></exception>
public static byte[] Open(byte[] cipherText, byte[] nonce, byte[] secretKey, byte[] publicKey)
{
//validate the length of the secret key
if (secretKey == null || secretKey.Length != SecretKeyBytes)
{
throw new KeyOutOfRangeException("secretKey", (secretKey == null) ? 0 : secretKey.Length,
string.Format("key must be {0} bytes in length.", SecretKeyBytes));
}
//validate the length of the public key
if (publicKey == null || publicKey.Length != PublicKeyBytes)
{
throw new KeyOutOfRangeException("publicKey", (publicKey == null) ? 0 : secretKey.Length,
string.Format("key must be {0} bytes in length.", PublicKeyBytes));
}
//validate the length of the nonce
if (nonce == null || nonce.Length != NONCE_BYTES)
{
throw new NonceOutOfRangeException("nonce", (nonce == null) ? 0 : nonce.Length,
string.Format("nonce must be {0} bytes in length.", NONCE_BYTES));
}
//check to see if there are MAC_BYTES of leading nulls, if so, trim.
//this is required due to an error in older versions.
if (cipherText[0] == 0)
{
//check to see if trim is needed
var trim = true;
for (var i = 0; i < MAC_BYTES - 1; i++)
{
if (cipherText[i] != 0)
{
trim = false;
break;
}
}
//if the leading MAC_BYTES are null, trim it off before going on.
if (trim)
{
var temp = new byte[cipherText.Length - MAC_BYTES];
Array.Copy(cipherText, MAC_BYTES, temp, 0, cipherText.Length - MAC_BYTES);
cipherText = temp;
}
}
var buffer = new byte[cipherText.Length - MAC_BYTES];
var open = DynamicInvoke.GetDynamicInvoke <_Open>("crypto_box_open_easy", SodiumCore.LibraryName());
var ret = open(buffer, cipherText, cipherText.Length, nonce, publicKey, secretKey);
if (ret != 0)
{
throw new CryptographicException("Failed to open SecretBox");
}
return(buffer);
}
//TODO: we could implement a method which increments the nonce.
/// <summary>Generates a random 8 byte nonce.</summary>
/// <returns>Returns a byte array with 8 random bytes.</returns>
public static byte[] GenerateNonce()
{
return(SodiumCore.GetRandomBytes(NPUBBYTES));
}
/// <summary>Generates a random 32 byte salt for the Scrypt algorithm.</summary>
/// <returns>Returns a byte array with 32 random bytes</returns>
public static byte[] ScryptGenerateSalt()
{
return(SodiumCore.GetRandomBytes((int)SCRYPT_SALSA208_SHA256_SALTBYTES));
}
/// <summary>Returns the hash in a string format, which includes the generated salt.</summary>
/// <param name="password">The password.</param>
/// <param name="opsLimit">Represents a maximum amount of computations to perform.</param>
/// <param name="memLimit">Is the maximum amount of RAM that the function will use, in bytes.</param>
/// <returns>Returns an zero-terminated ASCII encoded string of the computed password and hash.</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="OutOfMemoryException"></exception>
public static string ScryptHashString(string password, long opsLimit, int memLimit)
{
if (password == null)
{
throw new ArgumentNullException("password", "Password cannot be null");
}
if (opsLimit <= 0)
{
throw new ArgumentOutOfRangeException("opsLimit", "opsLimit cannot be zero or negative");
}
if (memLimit <= 0)
{
throw new ArgumentOutOfRangeException("memLimit", "memLimit cannot be zero or negative");
}
var buffer = new byte[SCRYPT_SALSA208_SHA256_BYTES];
var pass = Encoding.UTF8.GetBytes(password);
var hash = DynamicInvoke.GetDynamicInvoke <_HashString>("crypto_pwhash_scryptsalsa208sha256_str", SodiumCore.LibraryName());
var ret = hash(buffer, pass, pass.LongLength, opsLimit, memLimit);
if (ret != 0)
{
throw new OutOfMemoryException("Internal error, hash failed");
}
return(Encoding.UTF8.GetString(buffer));
}
/// <summary>Generates a random 16 byte salt for the Argon2i algorithm.</summary>
/// <returns>Returns a byte array with 16 random bytes</returns>
public static byte[] ArgonGenerateSalt()
{
return(SodiumCore.GetRandomBytes((int)ARGON_SALTBYTES));
}
/// <summary>Generates a hash based on a key, salt and personal bytes</summary>
/// <returns><c>byte</c> hashed message</returns>
/// <param name="message">Message.</param>
/// <param name="key">Key.</param>
/// <param name="salt">Salt.</param>
/// <param name="personal">Personal string.</param>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="SaltOutOfRangeException"></exception>
/// <exception cref="PersonalOutOfRangeException"></exception>
public static byte[] HashSaltPersonal(byte[] message, byte[] key, byte[] salt, byte[] personal)
{
if (message == null)
{
throw new ArgumentNullException("message", "Message cannot be null");
}
if (salt == null)
{
throw new ArgumentNullException("salt", "Salt cannot be null");
}
if (personal == null)
{
throw new ArgumentNullException("personal", "Personal string cannot be null");
}
if (key != null && (key.Length > KEY_BYTES_MAX || key.Length < KEY_BYTES_MIN))
{
throw new KeyOutOfRangeException(string.Format("key must be between {0} and {1} bytes in length.", KEY_BYTES_MIN, KEY_BYTES_MAX));
}
if (key == null)
{
key = new byte[0];
}
if (salt.Length != SALT_BYTES)
{
throw new SaltOutOfRangeException(string.Format("Salt must be {0} bytes in length.", SALT_BYTES));
}
if (personal.Length != PERSONAL_BYTES)
{
throw new PersonalOutOfRangeException(string.Format("Personal bytes must be {0} bytes in length.", PERSONAL_BYTES));
}
var buffer = new byte[OUT_BYTES];
var hash = DynamicInvoke.GetDynamicInvoke <_GenericHashSaltPersonal>("crypto_generichash_blake2b_salt_personal", SodiumCore.LibraryName());
hash(buffer, buffer.Length, message, message.LongLength, key, key.Length, salt, personal);
return(buffer);
}
/// <summary>Verifies a message signed with the Sign method.</summary>
/// <param name="message">The message.</param>
/// <param name="signature">The 16 byte signature.</param>
/// <param name="key">The 32 byte key.</param>
/// <returns>True if verified.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="SignatureOutOfRangeException"></exception>
public static bool Verify(byte[] message, byte[] signature, byte[] key)
{
//validate the length of the key
if (key == null || key.Length != KEY_BYTES)
{
throw new KeyOutOfRangeException("key", (key == null) ? 0 : key.Length,
string.Format("key must be {0} bytes in length.", KEY_BYTES));
}
//validate the length of the signature
if (signature == null || signature.Length != BYTES)
{
throw new SignatureOutOfRangeException("signature", (signature == null) ? 0 : signature.Length,
string.Format("signature must be {0} bytes in length.", BYTES));
}
var verify = DynamicInvoke.GetDynamicInvoke <_Verify>("crypto_onetimeauth_verify", SodiumCore.LibraryName());
var ret = verify(signature, message, message.Length, key);
return(ret == 0);
}
/// <summary>Hashes a message, with an optional key, using the BLAKE2b primitive.</summary>
/// <param name="message">The message to be hashed.</param>
/// <param name="key">The key; may be null, otherwise between 16 and 64 bytes.</param>
/// <param name="bytes">The size (in bytes) of the desired result.</param>
/// <returns>Returns a byte array.</returns>
/// <exception cref="KeyOutOfRangeException"></exception>
/// <exception cref="BytesOutOfRangeException"></exception>
public static byte[] Hash(byte[] message, byte[] key, int bytes)
{
//validate the length of the key
int keyLength;
if (key != null)
{
if (key.Length > KEY_BYTES_MAX || key.Length < KEY_BYTES_MIN)
{
throw new KeyOutOfRangeException(string.Format("key must be between {0} and {1} bytes in length.",
KEY_BYTES_MIN, KEY_BYTES_MAX));
}
keyLength = key.Length;
}
else
{
key = new byte[0];
keyLength = 0;
}
//validate output length
if (bytes > BYTES_MAX || bytes < BYTES_MIN)
{
throw new BytesOutOfRangeException("bytes", bytes,
string.Format("bytes must be between {0} and {1} bytes in length.", BYTES_MIN, BYTES_MAX));
}
var buffer = new byte[bytes];
var hash = DynamicInvoke.GetDynamicInvoke <_GenericHash>("crypto_generichash", SodiumCore.LibraryName());
hash(buffer, buffer.Length, message, message.Length, key, keyLength);
return(buffer);
}
/// <summary>Generates a random 32 byte key.</summary>
/// <returns>Returns a byte array with 32 random bytes</returns>
public static byte[] GenerateKey()
{
return(SodiumCore.GetRandomBytes(KEY_BYTES));
}
/// <summary>Creates a new key pair based on a random seed.</summary>
/// <returns>A KeyPair.</returns>
public static KeyPair GenerateKeyPair()
{
var publicKey = new byte[PublicKeyBytes];
var privateKey = new byte[SecretKeyBytes];
var kp = DynamicInvoke.GetDynamicInvoke <_GenerateKeyPair>("crypto_box_keypair", SodiumCore.LibraryName());
kp(publicKey, privateKey);
return(new KeyPair(publicKey, privateKey));
}
