/// <summary>
/// Computes the hash value for the specified string.
/// </summary>
/// <param name="hashType">The type of algorithm to use when computing the hash.</param>
/// <param name="value">The input to compute the hash code for.</param>
/// <param name="encoding">
/// The encoding to use when retrieving the binary representation of <paramref name="value"/>.
/// If null or not supplied, then <see cref="Encoding.UTF8"/> is used instead.
/// </param>
/// <returns>The computed hash code.</returns>
public static string ComputeHash(this HashType hashType, string value, Encoding encoding = null)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
encoding = encoding ?? Encoding.UTF8;
return(hashType.ComputeHash(encoding.GetBytes(value)));
}
/// <summary>
/// 获取Hash后的字节数组
/// </summary>
/// <param name="type">哈希类型</param>
/// <param name="key">key</param>
/// <param name="bytes">原字节数组</param>
/// <returns></returns>
public static byte[] GetHashedBytes(HashType type, byte[] bytes, byte[]?key)
{
Guard.NotNull(bytes, nameof(bytes));
if (bytes.Length == 0)
{
return(bytes);
}
HashAlgorithm algorithm = null !;
try
{
if (key == null)
{
algorithm = type switch
{
HashType.SHA1 => SHA1.Create(),
HashType.SHA256 => SHA256.Create(),
HashType.SHA384 => SHA384.Create(),
HashType.SHA512 => SHA512.Create(),
_ => MD5.Create()
};
}
else
{
algorithm = type switch
{
HashType.SHA1 => new HMACSHA1(key),
HashType.SHA256 => new HMACSHA256(key),
HashType.SHA384 => new HMACSHA384(key),
HashType.SHA512 => new HMACSHA512(key),
_ => new HMACMD5(key)
};
}
return(algorithm.ComputeHash(bytes));
}
finally
{
algorithm.Dispose();
}
}
/// <summary>
/// Computes the hash value for the specified byte array.
/// </summary>
/// <param name="hashType">The type of algorithm to use when computing the hash.</param>
/// <param name="data">The input to compute the hash code for.</param>
/// <returns>The computed hash code.</returns>
public static string ToHash(this byte[] data, HashType hashType)
{
return hashType.ComputeHash(data);
}
/// <summary>
/// Converts a string to a Hash of the specified type.
/// </summary>
/// <param name="value">The string to be hashed.</param>
/// <param name="hashType">Type of the hash.</param>
/// <returns>The hash value</returns>
public static string ToHash(this string value, HashType hashType)
{
return hashType.ComputeHash(value);
}
/// <summary>
/// Converts a string to a Hash of the specified type.
/// </summary>
/// <param name="value">The string to be hashed.</param>
/// <param name="hashType">Type of the hash.</param>
/// <returns>The hash value</returns>
public static string ToHash(this string value, HashType hashType)
{
return(hashType.ComputeHash(value));
}
/// <summary>
/// Computes the hash value for the specified <see cref="Stream"/> object.
/// </summary>
/// <param name="hashType">The type of algorithm to use when computing the hash.</param>
/// <param name="inputStream">The input to compute the hash code for.</param>
/// <returns>The computed hash code.</returns>
public static string ComputeHash(this HashType hashType, Stream inputStream)
{
return(hashType.ComputeHash(inputStream, false));
}
/// <summary>
/// Computes the hash value for the specified byte array.
/// </summary>
/// <param name="hashType">The type of algorithm to use when computing the hash.</param>
/// <param name="data">The input to compute the hash code for.</param>
/// <returns>The computed hash code.</returns>
public static string ToHash(this byte[] data, HashType hashType)
{
return(hashType.ComputeHash(data));
}
