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| using System;
using System.IO;
using System.Linq;
namespace NullLib.HashCalc
{
public class HashHelper
{
public static string CalcMd5x32(byte[] bytValue)
{
return CalcMd5x32(new MemoryStream(bytValue));
}
public static string CalcMd5x16(byte[] bytValue)
{
return CalcMd5x16(new MemoryStream(bytValue));
}
public static string CalcShax1(byte[] bytValue)
{
return CalcShax1(new MemoryStream(bytValue));
}
public static string CalcShax256(byte[] bytValue)
{
return CalcShax256(new MemoryStream(bytValue));
}
public static string CalcShax384(byte[] bytValue)
{
return CalcShax384(new MemoryStream(bytValue));
}
public static string CalcShax512(byte[] bytValue)
{
return CalcShax512(new MemoryStream(bytValue));
}
public static string CalcMd5x32(Stream stream)
{
var MD5CSP = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] bytHash = MD5CSP.ComputeHash(stream);
MD5CSP.Clear();
string sHash = BytesToHex(bytHash);
return sHash;
}
public static string CalcMd5x16(Stream stream)
{
return CalcMd5x32(stream).Substring(8, 16);
}
public static string CalcShax1(Stream stream)
{
var SHA1CSP = new System.Security.Cryptography.SHA1CryptoServiceProvider();
byte[] bytHash = SHA1CSP.ComputeHash(stream);
SHA1CSP.Clear();
string sHash = BytesToHex(bytHash);
return sHash;
}
public static string CalcShax256(Stream stream)
{
var SHA256CSP = new System.Security.Cryptography.SHA256CryptoServiceProvider();
byte[] bytHash = SHA256CSP.ComputeHash(stream);
SHA256CSP.Clear();
string sHash = BytesToHex(bytHash);
return sHash;
}
public static string CalcShax384(Stream stream)
{
var SHA384CSP = new System.Security.Cryptography.SHA384CryptoServiceProvider();
byte[] bytHash = SHA384CSP.ComputeHash(stream);
SHA384CSP.Clear();
string sHash = BytesToHex(bytHash);
return sHash;
}
public static string CalcShax512(Stream stream)
{
var SHA512CSP = new System.Security.Cryptography.SHA512CryptoServiceProvider();
byte[] bytHash = SHA512CSP.ComputeHash(stream);
SHA512CSP.Clear();
string sHash = BytesToHex(bytHash);
return sHash;
}
public static string CalcCrcx32(Stream stream)
{
Crc32 calculator = new Crc32();
byte[] buffer = calculator.ComputeHash(stream);
calculator.Clear();
//将字节数组转换成十六进制的字符串形式
string sHash = BytesToHex(buffer);
return sHash;
}
private static string BytesToHex(byte[] array)
{
return string.Join(null, array.Select(v => Convert.ToString(v, 16).PadLeft(2, '0')));
}
/// <summary>
/// 提供 CRC32 算法的实现
/// </summary>
private class Crc32 : System.Security.Cryptography.HashAlgorithm
{
public const uint DefaultPolynomial = 0xedb88320;
public const uint DefaultSeed = 0xffffffff;
private uint hash;
private uint seed;
private uint[] table;
private static uint[] defaultTable;
public Crc32()
{
table = InitializeTable(DefaultPolynomial);
seed = DefaultSeed;
Initialize();
}
public Crc32(uint polynomial, uint seed)
{
table = InitializeTable(polynomial);
this.seed = seed;
Initialize();
}
public override void Initialize()
{
hash = seed;
}
protected override void HashCore(byte[] buffer, int start, int length)
{
hash = CalculateHash(table, hash, buffer, start, length);
}
protected override byte[] HashFinal()
{
byte[] hashBuffer = uintToBigEndianBytes(~hash);
this.HashValue = hashBuffer;
return hashBuffer;
}
public static uint Compute(byte[] buffer)
{
return ~CalculateHash(InitializeTable(DefaultPolynomial), DefaultSeed, buffer, 0, buffer.Length);
}
public static uint Compute(uint seed, byte[] buffer)
{
return ~CalculateHash(InitializeTable(DefaultPolynomial), seed, buffer, 0, buffer.Length);
}
public static uint Compute(uint polynomial, uint seed, byte[] buffer)
{
return ~CalculateHash(InitializeTable(polynomial), seed, buffer, 0, buffer.Length);
}
private static uint[] InitializeTable(uint polynomial)
{
if (polynomial == DefaultPolynomial && defaultTable != null)
{
return defaultTable;
}
uint[] createTable = new uint[256];
for (int i = 0; i < 256; i++)
{
uint entry = (uint)i;
for (int j = 0; j < 8; j++)
{
if ((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
}
createTable[i] = entry;
}
if (polynomial == DefaultPolynomial)
{
defaultTable = createTable;
}
return createTable;
}
private static uint CalculateHash(uint[] table, uint seed, byte[] buffer, int start, int size)
{
uint crc = seed;
for (int i = start; i < size; i++)
{
unchecked
{
crc = (crc >> 8) ^ table[buffer[i] ^ crc & 0xff];
}
}
return crc;
}
private byte[] uintToBigEndianBytes(uint x)
{
return new byte[] { (byte)((x >> 24) & 0xff), (byte)((x >> 16) & 0xff), (byte)((x >> 8) & 0xff), (byte)(x & 0xff) };
}
}
}
}
|