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如何从整数生成 MD5 哈希（32/64 个字符）？
我得到的是从字符串或字节数组生成 MD5 哈希字符串的示例。但就我而言，我需要获取整数的 MD5 哈希值。
我知道
GetHashCode()我是否需要将整数转换为字符串或字节数组才能获得预期的 MD5 哈希字符串？
类似这样的：
int source = 123;
String hash;
// Do not omit "using" - should be disposed
using (var md5 = System.Security.Cryptography.MD5.Create())
{
hash = String.Concat(md5.ComputeHash(BitConverter
.GetBytes(source))
.Select(x => x.ToString("x2")));
}
// Test
// d119fabe038bc5d0496051658fd205e6
Console.Write(hash);
如果你想知道“生命的意义”的 md5 哈希值是什么，你可以
int meaningOfLife = 42;
var result = CalculateMD5Hash(""+meaningOfLife);
这假设你可以
public string CalculateMD5Hash(string input)
{
// step 1, calculate MD5 hash from input
MD5 md5 = System.Security.Cryptography.MD5.Create();
byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
byte[] hash = md5.ComputeHash(inputBytes);
// step 2, convert byte array to hex string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hash.Length; i++)
{
sb.Append(hash[i].ToString("X2"));
}
return sb.ToString();
}
首先您需要将整数转换为字节数组，然后您可以执行以下操作：
byte[] hashValue;
using (var md5 = MD5.Create())
{
hashValue = md5.ComputeHash(BitConverter.GetBytes(5));
}
谢谢大家。在参考了所有答案后，我在这里发布我的答案，其中包含用于从整数/字符串/字节数组生成“MD5哈希（32/64个字符）”的通用方法。可能对其他人有帮助。
using System;
using System.Security.Cryptography;
using System.Text;
using System.Linq;
namespace ConvertIntToHashCodeConsoleApp
{
class Program
{
static void Main(string[] args)
{
int number = 100;
Console.WriteLine(GetHashMD5(number.ToString()));
Console.WriteLine(GetHashStringFromInteger(number));
Console.Read();
}
/// <summary>
/// Get the Hash Value for MD5 Hash(32 Characters) from an integer
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
public static string GetHashStringFromInteger(int number)
{
string hash;
using (var md5 = System.Security.Cryptography.MD5.Create())
{
hash = String.Concat(md5.ComputeHash(BitConverter
.GetBytes(number))
.Select(x => x.ToString("x2")));
}
return hash;
}
/// <summary>
/// Get the Hash Value for sha256 Hash(64 Characters)
/// </summary>
/// <param name="data">The Input Data</param>
/// <returns></returns>
public static string GetHash256(string data)
{
string hashResult = string.Empty;
if (data != null)
{
using (SHA256 sha256 = SHA256Managed.Create())
{
byte[] dataBuffer = Encoding.UTF8.GetBytes(data);
byte[] dataBufferHashed = sha256.ComputeHash(dataBuffer);
hashResult = GetHashString(dataBufferHashed);
}
}
return hashResult;
}
/// <summary>
/// Get the Hash Value for MD5 Hash(32 Characters)
/// </summary>
/// <param name="data">The Input Data</param>
/// <returns></returns>
public static string GetHashMD5(string data)
{
string hashResult = string.Empty;
if (data != null)
{
using (MD5 md5 = MD5.Create())
{
byte[] dataBuffer = Encoding.UTF8.GetBytes(data);
byte[] dataBufferHashed = md5.ComputeHash(dataBuffer);
hashResult = GetHashString(dataBufferHashed);
}
}
return hashResult;
}
/// <summary>
/// Get the Encrypted Hash Data
/// </summary>
/// <param name="dataBufferHashed">Buffered Hash Data</param>
/// <returns> Encrypted hash String </returns>
private static string GetHashString(byte[] dataBufferHashed)
{
StringBuilder sb = new StringBuilder();
foreach (byte b in dataBufferHashed)
{
sb.Append(b.ToString("X2"));
}
return sb.ToString();
}
}
}
随时欢迎修改/任何更好的解决方案。
你可以试试这个，
int intValue = ; // your value
byte[] intBytes = BitConverter.GetBytes(intValue);
Array.Reverse(intBytes);
byte[] result = intBytes; // you are most probably working on a little-endian machine
byte[] hash = ((HashAlgorithm) CryptoConfig.CreateFromName("MD5")).ComputeHash(result);
// string representation (similar to UNIX format)
string encoded = BitConverter.ToString(hash)
// without dashes
.Replace("-", string.Empty)
// make lowercase
.ToLower();
使用一些注重性能的功能（例如span和stackalloc）在散列过程中分配更少的内存！
用途：
var number = 42;
var hash = number.ToString().ToMD5();
代码：
using System;
using System.Security.Cryptography;
using System.Text;
public static class MD5Extensions
{
public static string ToMd5(this string input)
{
var inputBytes = Encoding.ASCII.GetBytes(input);
return inputBytes.ToMd5(0, inputBytes.Length);
}
public static string ToMd5(this byte[] inputBytes, int offset, int count)
{
Span<char> chars = stackalloc char[32];
inputBytes.ToMd5(offset, count, chars);
return chars.ToString();
}
public static void ToMd5(this byte[] input, int offset, int count, Span<char> destination)
{
using var md5 = MD5.Create();
var hashBytes = md5.ComputeHash(input, offset, count);
var charsWritten = 0;
const string format = "X2";
foreach (var hashByte in hashBytes)
{
if (hashByte.TryFormat(destination, out charsWritten, format))
{
destination = destination.Slice(charsWritten);
}
else
{
throw new InvalidOperationException(
$"byte '{hashByte}' could not be parsed using format '{format}' and avaible space of {destination.Length}");
}
}
}
}