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vb.net中md5加密,c# md5 加解密

求VB.NET的MD5算法调用

下面是完整的类，可以设置任意密码

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'DES及md5加密解密----添加引用中添加对system.web的引用。

Imports System.Security.Cryptography

Imports System

Imports System.Text

Imports System.Web

''' summary

''' DES加密类

''' /summary

''' remarks/remarks

Public Class DESEncrypt

Public Sub DESEncrypt()

End Sub

Public Shared Function Encrypt(ByVal Text As String) As String

Return Encrypt(Text, "12345678")

End Function

Public Shared Function Encrypt(ByVal Text As String, ByVal sKey As String) As String

Dim des As New DESCryptoServiceProvider()

Dim inputByteArray As Byte()

inputByteArray = Encoding.Default.GetBytes(Text)

des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))

des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))

Dim ms As New System.IO.MemoryStream()

Dim cs As New CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)

cs.Write(inputByteArray, 0, inputByteArray.Length)

cs.FlushFinalBlock()

Dim ret As New StringBuilder()

Dim b As Byte

For Each b In ms.ToArray()

ret.AppendFormat("{0:X2}", b)

Return ret.ToString()

End Function

Public Shared Function Decrypt(ByVal Text As String) As String

Return Decrypt(Text, "12345678")

End Function

Public Shared Function Decrypt(ByVal Text As String, ByVal sKey As String) As String

Dim des As New DESCryptoServiceProvider()

Dim len As Integer

len = Text.Length / 2

Dim inputByteArray(len - 1) As Byte

Dim x, i As Integer

For x = 0 To len - 1

i = Convert.ToInt32(Text.Substring(x * 2, 2), 16)

inputByteArray(x) = CType(i, Byte)

des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))

des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))

Dim ms As New System.IO.MemoryStream()

Dim cs As New CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)

cs.Write(inputByteArray, 0, inputByteArray.Length)

cs.FlushFinalBlock()

Return Encoding.Default.GetString(ms.ToArray())

End Function

End Class

'以下是调用方法

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click '加密

Dim str_Encrypt As String = DESEncrypt.Encrypt("你要加密的文本，可以是任意长度", "密码，可以很长，如果省略这个参数就是默认的12345678")

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click '解密

Dim str_Decrypt As String = DESEncrypt.Decrypt("你要解密的文本, 可以是任意长度", "加密时用到的密码，如果省略这个参数就是默认的12345678")

End Sub

net中，md5具体怎么使用加密和解密

using System;

using System.Text;

using System.Security.Cryptography;

namespace MD5

{

public class MD5

{

// 32 位

public static String Encrypt(String s)

{

MD5 md5 = new MD5CryptoServiceProvider();

byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);

bytes = md5.ComputeHash(bytes);

md5.Clear();

string ret = "";

for (int i = 0; i bytes.Length; i++)

{

ret += Convert.ToString(bytes[i], 16).PadLeft(2, '0');

}

return ret.PadLeft(32, '0');

}

// 16 位

public static string Encrypt16(string ConvertString)

{

MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);

t2 = t2.Replace("-", "");

return t2;

}

-------------------------------------

引用MD5命名空间

using MD5;

直接用MD5.Encrypt(textbox1.Text);即可加密；

MD5没有解密的算法，要不然就不用加密了，网上有一些解密的网站，有些能解密，有些解密不了，有些还需要收费才能解密。

VB MD5加密解密的代码

Dim md5 As New MD5CryptoServiceProvider

Dim username As Byte() = (New ASCIIEncoding).GetBytes(TextBox1.Text)

'转换为哈希值Byte数组

Dim mdByte As Byte() = md5.ComputeHash(username)

'Dim mdString As String = System.BitConverter.ToString(mdByte)

Dim mdString As String = (New ASCIIEncoding).GetString(mdByte)

TextBox2.Text = mdString

md5理论上是不可破解的，要对照，只能再次加密后对照，网上也有些专门破解的网站，不过我想你要的不是那个吧

用VB实现MD5加密

md5加密运算是不可逆的，就是说不能通过那一串古古怪怪的东西算出它原始的样子。

以下提供VB可用的16位和32位MD5加密函数代码：

Private Const BITS_TO_A_BYTE = 8

Private Const BYTES_TO_A_WORD = 4

Private Const BITS_TO_A_WORD = 32

Private m_lOnBits(30)

Private m_l2Power(30)

Private Function LShift(lValue, iShiftBits)

If iShiftBits = 0 Then

LShift = lValue

Exit Function

ElseIf iShiftBits = 31 Then

If lValue And 1 Then

LShift = H80000000

Else

LShift = 0

End If

Exit Function

ElseIf iShiftBits 0 Or iShiftBits 31 Then

Err.Raise 6

End If

If (lValue And m_l2Power(31 - iShiftBits)) Then

LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or H80000000

Else

LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))

End If

End Function

Private Function RShift(lValue, iShiftBits)

If iShiftBits = 0 Then

RShift = lValue

Exit Function

ElseIf iShiftBits = 31 Then

If lValue And H80000000 Then

RShift = 1

Else

RShift = 0

End If

Exit Function

ElseIf iShiftBits 0 Or iShiftBits 31 Then

Err.Raise 6

End If

RShift = (lValue And H7FFFFFFE) \ m_l2Power(iShiftBits)

If (lValue And H80000000) Then

RShift = (RShift Or (H40000000 \ m_l2Power(iShiftBits - 1)))

End If

End Function

Private Function RotateLeft(lValue, iShiftBits)

RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))

End Function

Private Function AddUnsigned(lX, lY)

Dim lX4

Dim lY4

Dim lX8

Dim lY8

Dim lResult

lX8 = lX And H80000000

lY8 = lY And H80000000

lX4 = lX And H40000000

lY4 = lY And H40000000

lResult = (lX And H3FFFFFFF) + (lY And H3FFFFFFF)

If lX4 And lY4 Then

lResult = lResult Xor H80000000 Xor lX8 Xor lY8

ElseIf lX4 Or lY4 Then

If lResult And H40000000 Then

lResult = lResult Xor HC0000000 Xor lX8 Xor lY8

Else

lResult = lResult Xor H40000000 Xor lX8 Xor lY8

End If

Else

lResult = lResult Xor lX8 Xor lY8

End If

AddUnsigned = lResult

End Function

Private Function md5_F(x, y, z)

md5_F = (x And y) Or ((Not x) And z)

End Function

Private Function md5_G(x, y, z)

md5_G = (x And z) Or (y And (Not z))

End Function

Private Function md5_H(x, y, z)

md5_H = (x Xor y Xor z)

End Function

Private Function md5_I(x, y, z)

md5_I = (y Xor (x Or (Not z)))

End Function

Private Sub md5_FF(a, b, c, d, x, s, ac)

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))

a = RotateLeft(a, s)

a = AddUnsigned(a, b)

End Sub

Private Sub md5_GG(a, b, c, d, x, s, ac)

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))

a = RotateLeft(a, s)

a = AddUnsigned(a, b)

End Sub

Private Sub md5_HH(a, b, c, d, x, s, ac)

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))

a = RotateLeft(a, s)

a = AddUnsigned(a, b)

End Sub

Private Sub md5_II(a, b, c, d, x, s, ac)

a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))

a = RotateLeft(a, s)

a = AddUnsigned(a, b)

End Sub

Private Function ConvertToWordArray(sMessage)

Dim lMessageLength

Dim lNumberOfWords

Dim lWordArray()

Dim lBytePosition

Dim lByteCount

Dim lWordCount

Const MODULUS_BITS = 512

Const CONGRUENT_BITS = 448

lMessageLength = Len(sMessage)

lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)

ReDim lWordArray(lNumberOfWords - 1)

lBytePosition = 0

lByteCount = 0

Do Until lByteCount = lMessageLength

lWordCount = lByteCount \ BYTES_TO_A_WORD

lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE

lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)

lByteCount = lByteCount + 1

Loop

lWordCount = lByteCount \ BYTES_TO_A_WORD

lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE

lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(H80, lBytePosition)

lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)

lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)

ConvertToWordArray = lWordArray

End Function

Private Function WordToHex(lValue)

Dim lByte

Dim lCount

For lCount = 0 To 3

lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)

WordToHex = WordToHex Right("0" Hex(lByte), 2)

End Function

Public Function MD5(sMessage, stype)

m_lOnBits(0) = CLng(1)

m_lOnBits(1) = CLng(3)

m_lOnBits(2) = CLng(7)

m_lOnBits(3) = CLng(15)

m_lOnBits(4) = CLng(31)

m_lOnBits(5) = CLng(63)

m_lOnBits(6) = CLng(127)

m_lOnBits(7) = CLng(255)

m_lOnBits(8) = CLng(511)

m_lOnBits(9) = CLng(1023)

m_lOnBits(10) = CLng(2047)

m_lOnBits(11) = CLng(4095)

m_lOnBits(12) = CLng(8191)

m_lOnBits(13) = CLng(16383)

m_lOnBits(14) = CLng(32767)

m_lOnBits(15) = CLng(65535)

m_lOnBits(16) = CLng(131071)

m_lOnBits(17) = CLng(262143)

m_lOnBits(18) = CLng(524287)

m_lOnBits(19) = CLng(1048575)

m_lOnBits(20) = CLng(2097151)

m_lOnBits(21) = CLng(4194303)

m_lOnBits(22) = CLng(8388607)

m_lOnBits(23) = CLng(16777215)

m_lOnBits(24) = CLng(33554431)

m_lOnBits(25) = CLng(67108863)

m_lOnBits(26) = CLng(134217727)

m_lOnBits(27) = CLng(268435455)

m_lOnBits(28) = CLng(536870911)

m_lOnBits(29) = CLng(1073741823)

m_lOnBits(30) = CLng(2147483647)

m_l2Power(0) = CLng(1)

m_l2Power(1) = CLng(2)

m_l2Power(2) = CLng(4)

m_l2Power(3) = CLng(8)

m_l2Power(4) = CLng(16)

m_l2Power(5) = CLng(32)

m_l2Power(6) = CLng(64)

m_l2Power(7) = CLng(128)

m_l2Power(8) = CLng(256)

m_l2Power(9) = CLng(512)

m_l2Power(10) = CLng(1024)

m_l2Power(11) = CLng(2048)

m_l2Power(12) = CLng(4096)

m_l2Power(13) = CLng(8192)

m_l2Power(14) = CLng(16384)

m_l2Power(15) = CLng(32768)

m_l2Power(16) = CLng(65536)

m_l2Power(17) = CLng(131072)

m_l2Power(18) = CLng(262144)

m_l2Power(19) = CLng(524288)

m_l2Power(20) = CLng(1048576)

m_l2Power(21) = CLng(2097152)

m_l2Power(22) = CLng(4194304)

m_l2Power(23) = CLng(8388608)

m_l2Power(24) = CLng(16777216)

m_l2Power(25) = CLng(33554432)

m_l2Power(26) = CLng(67108864)

m_l2Power(27) = CLng(134217728)

m_l2Power(28) = CLng(268435456)

m_l2Power(29) = CLng(536870912)

m_l2Power(30) = CLng(1073741824)

Dim x

Dim k

Dim AA

Dim BB

Dim CC

Dim DD

Dim a

Dim b

Dim c

Dim d

Const S11 = 7

Const S12 = 12

Const S13 = 17

Const S14 = 22

Const S21 = 5

Const S22 = 9

Const S23 = 14

Const S24 = 20

Const S31 = 4

Const S32 = 11

Const S33 = 16

Const S34 = 23

Const S41 = 6

Const S42 = 10

Const S43 = 15

Const S44 = 21

x = ConvertToWordArray(sMessage)

a = H67452301

b = HEFCDAB89

c = H98BADCFE

d = H10325476

For k = 0 To UBound(x) Step 16

AA = a

BB = b

CC = c

DD = d

md5_FF a, b, c, d, x(k + 0), S11, HD76AA478

md5_FF d, a, b, c, x(k + 1), S12, HE8C7B756

md5_FF c, d, a, b, x(k + 2), S13, H242070DB

md5_FF b, c, d, a, x(k + 3), S14, HC1BDCEEE

md5_FF a, b, c, d, x(k + 4), S11, HF57C0FAF

md5_FF d, a, b, c, x(k + 5), S12, H4787C62A

md5_FF c, d, a, b, x(k + 6), S13, HA8304613

md5_FF b, c, d, a, x(k + 7), S14, HFD469501

md5_FF a, b, c, d, x(k + 8), S11, H698098D8

md5_FF d, a, b, c, x(k + 9), S12, H8B44F7AF

md5_FF c, d, a, b, x(k + 10), S13, HFFFF5BB1

md5_FF b, c, d, a, x(k + 11), S14, H895CD7BE

md5_FF a, b, c, d, x(k + 12), S11, H6B901122

md5_FF d, a, b, c, x(k + 13), S12, HFD987193

md5_FF c, d, a, b, x(k + 14), S13, HA679438E

md5_FF b, c, d, a, x(k + 15), S14, H49B40821

md5_GG a, b, c, d, x(k + 1), S21, HF61E2562

md5_GG d, a, b, c, x(k + 6), S22, HC040B340

md5_GG c, d, a, b, x(k + 11), S23, H265E5A51

md5_GG b, c, d, a, x(k + 0), S24, HE9B6C7AA

md5_GG a, b, c, d, x(k + 5), S21, HD62F105D

md5_GG d, a, b, c, x(k + 10), S22, H2441453

md5_GG c, d, a, b, x(k + 15), S23, HD8A1E681

md5_GG b, c, d, a, x(k + 4), S24, HE7D3FBC8

md5_GG a, b, c, d, x(k + 9), S21, H21E1CDE6

md5_GG d, a, b, c, x(k + 14), S22, HC33707D6

md5_GG c, d, a, b, x(k + 3), S23, HF4D50D87

md5_GG b, c, d, a, x(k + 8), S24, H455A14ED

md5_GG a, b, c, d, x(k + 13), S21, HA9E3E905

md5_GG d, a, b, c, x(k + 2), S22, HFCEFA3F8

md5_GG c, d, a, b, x(k + 7), S23, H676F02D9

md5_GG b, c, d, a, x(k + 12), S24, H8D2A4C8A

md5_HH a, b, c, d, x(k + 5), S31, HFFFA3942

md5_HH d, a, b, c, x(k + 8), S32, H8771F681

md5_HH c, d, a, b, x(k + 11), S33, H6D9D6122

md5_HH b, c, d, a, x(k + 14), S34, HFDE5380C

md5_HH a, b, c, d, x(k + 1), S31, HA4BEEA44

md5_HH d, a, b, c, x(k + 4), S32, H4BDECFA9

md5_HH c, d, a, b, x(k + 7), S33, HF6BB4B60

md5_HH b, c, d, a, x(k + 10), S34, HBEBFBC70

md5_HH a, b, c, d, x(k + 13), S31, H289B7EC6

md5_HH d, a, b, c, x(k + 0), S32, HEAA127FA

md5_HH c, d, a, b, x(k + 3), S33, HD4EF3085

md5_HH b, c, d, a, x(k + 6), S34, H4881D05

md5_HH a, b, c, d, x(k + 9), S31, HD9D4D039

md5_HH d, a, b, c, x(k + 12), S32, HE6DB99E5

md5_HH c, d, a, b, x(k + 15), S33, H1FA27CF8

md5_HH b, c, d, a, x(k + 2), S34, HC4AC5665

md5_II a, b, c, d, x(k + 0), S41, HF4292244

md5_II d, a, b, c, x(k + 7), S42, H432AFF97

md5_II c, d, a, b, x(k + 14), S43, HAB9423A7

md5_II b, c, d, a, x(k + 5), S44, HFC93A039

md5_II a, b, c, d, x(k + 12), S41, H655B59C3

md5_II d, a, b, c, x(k + 3), S42, H8F0CCC92

md5_II c, d, a, b, x(k + 10), S43, HFFEFF47D

md5_II b, c, d, a, x(k + 1), S44, H85845DD1

md5_II a, b, c, d, x(k + 8), S41, H6FA87E4F

md5_II d, a, b, c, x(k + 15), S42, HFE2CE6E0

md5_II c, d, a, b, x(k + 6), S43, HA3014314

md5_II b, c, d, a, x(k + 13), S44, H4E0811A1

md5_II a, b, c, d, x(k + 4), S41, HF7537E82

md5_II d, a, b, c, x(k + 11), S42, HBD3AF235

md5_II c, d, a, b, x(k + 2), S43, H2AD7D2BB

md5_II b, c, d, a, x(k + 9), S44, HEB86D391

a = AddUnsigned(a, AA)

b = AddUnsigned(b, BB)

c = AddUnsigned(c, CC)

d = AddUnsigned(d, DD)

If stype = 32 Then

MD5 = LCase(WordToHex(a) WordToHex(b) WordToHex(c) WordToHex(d))

Else

MD5 = LCase(WordToHex(b) WordToHex(c))

End If

End Function

'下面是测试代码

Sub test()

MsgBox MD5("a", 16) '16位加密

MsgBox MD5("a", 32) '32位加密

End Sub

怎么在.net上实现MD5crypt的加密（最好vb.net代码）

MD5实际一种单向的算法，是散列，很多人认为是加密，实际有误

比如说winxp、win7各版本都有MD5值，那么是否可依据这个值还原出个正版的winxp或win7呢？

况且MD5“加密”的密钥长度又是多少呢?比如des的不同版本有64位、128位、192位等

加密解密高手进！VB.NET 谁能给一个MD5或其他的加密算法

这个是我之前写的。在需要时调用即可。

Public Shared Function Encrypt(ByVal Text As String, ByVal sKey As String) As String

Dim provider As New DESCryptoServiceProvider()

Dim bytes As Byte() = Encoding.[Default].GetBytes(Text)

provider.Key = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))

provider.IV = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8))

Dim stream As New MemoryStream()

Dim stream2 As New CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write)

stream2.Write(bytes, 0, bytes.Length)

stream2.FlushFinalBlock()

Dim builder As New StringBuilder()

For Each num As Byte In stream.ToArray()

builder.AppendFormat("{0:X2}", num)

Return builder.ToString()

End Function

希望能帮到你

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