asp-classic - 如何在经典 ASP 中使用 VBScript 生成 MD5？

Question

我需要在我的应用程序中生成一个 MD5。

我试过谷歌，但只找到 MD5 的 PHP 代码。我需要连接到使用 MD5 哈希验证的客户端系统，但它们的代码是 PHP 的，我的是使用 VBScript 的 Classic ASP。

我的服务器支持 .Net，所以我不能使用 PHP 脚本。经典 ASP 中的 VBScript 是否有这样的 MD5 代码？

Answer 1

更新 2017-02-21 - 现在为 JWT 添加了 HMACSHA256

更新 2016-07-05 - 现在添加了 SHA1 和 SHA256

是的，对于所有一直在为此苦苦挣扎并想知道的人(如我自己)，这是可能的!

下面的代码被分成几个函数，这样你就可以 MD5/sha1/sha256 一个字符串或一个文件。

我从另一个 stackexchange 借用了函数 GetBytes 和 BytesToBase64，stringToUTFBytes 中的代码基于另一个 stackexchange。

function md5hashBytes(aBytes)
    Dim MD5
    set MD5 = CreateObject("System.Security.Cryptography.MD5CryptoServiceProvider")

    MD5.Initialize()
    'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
    md5hashBytes = MD5.ComputeHash_2( (aBytes) )
end function

function sha1hashBytes(aBytes)
    Dim sha1
    set sha1 = CreateObject("System.Security.Cryptography.SHA1Managed")

    sha1.Initialize()
    'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
    sha1hashBytes = sha1.ComputeHash_2( (aBytes) )
end function

function sha256hashBytes(aBytes)
    Dim sha256
    set sha256 = CreateObject("System.Security.Cryptography.SHA256Managed")

    sha256.Initialize()
    'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
    sha256hashBytes = sha256.ComputeHash_2( (aBytes) )
end function

function sha256HMACBytes(aBytes, aKey)
    Dim sha256
    set sha256 = CreateObject("System.Security.Cryptography.HMACSHA256")

    sha256.Initialize()
    sha256.key=aKey
    'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
    sha256HMACBytes = sha256.ComputeHash_2( (aBytes) )
end function

function stringToUTFBytes(aString)
    Dim UTF8
    Set UTF8 = CreateObject("System.Text.UTF8Encoding")
    stringToUTFBytes = UTF8.GetBytes_4(aString)
end function

function bytesToHex(aBytes)
    dim hexStr, x
    for x=1 to lenb(aBytes)
        hexStr= hex(ascb(midb( (aBytes),x,1)))
        if len(hexStr)=1 then hexStr="0" & hexStr
        bytesToHex=bytesToHex & hexStr
    next
end function

Function BytesToBase64(varBytes)
    With CreateObject("MSXML2.DomDocument").CreateElement("b64")
        .dataType = "bin.base64"
        .nodeTypedValue = varBytes
        BytesToBase64 = .Text
    End With
End Function

'Special version that produces the URLEncoded variant of Base64 used in JWTs.
Function BytesToBase64UrlEncode(varBytes)
    With CreateObject("MSXML2.DomDocument").CreateElement("b64")
        .dataType = "bin.base64"
        .nodeTypedValue = varBytes
        BytesToBase64UrlEncode = replace(replace(replace(replace(replace(.Text,chr(13),""),chr(10),""),"+", "-"),"/", "_"),"=", "")
    End With
End Function

Function GetBytes(sPath)
    With CreateObject("Adodb.Stream")
        .Type = 1 ' adTypeBinary
        .Open
        .LoadFromFile sPath
        .Position = 0
        GetBytes = .Read
        .Close
    End With
End Function

这些可以按如下方式使用:

BytesToBase64(md5hashBytes(stringToUTFBytes("Hello World")))

产生:sQqNsWTgdUEFt6mb5y4/5Q==

bytesToHex(md5hashBytes(stringToUTFBytes("Hello World")))

生产:B10A8DB164E0754105B7A99BE72E3FE5

对于 SHA1:

bytesToHex(sha1hashBytes(stringToUTFBytes("Hello World")))

生产:0A4D55A8D778E5022FAB701977C5D840BBC486D0

对于 SHA256:

bytesToHex(sha256hashBytes(stringToUTFBytes("Hello World")))

生产:A591A6D40BF420404A011733CFB7B190D62C65BF0BCDA32B57B277D9AD9F146E

获取文件的 MD5(对于 Amazon S3 MD5 检查很有用):

BytesToBase64(md5hashBytes(GetBytes(sPath)))

其中 sPath 是本地文件的路径。

最后，创建一个 JWT:

'define the JWT header, needs to be converted to UTF bytes:
aHead=stringToUTFBytes("{""alg"":""HS256"",""typ"":""JWT""}")

'define the JWT payload, again needs to be converted to UTF Bytes.
aPayload=stringToUTFBytes("{""sub"":""1234567890"",""name"":""John Doe"",""admin"":true}") 

'Your shared key.
theKey="mySuperSecret"

aSigSource=stringToUTFBytes(BytesToBase64UrlEncode(aHead) & "." & BytesToBase64UrlEncode(aPayload))

'The full JWT correctly Base 64 URL encoded.
aJWT=BytesToBase64UrlEncode(aHead) & "." & BytesToBase64UrlEncode(aPayload) & "." & BytesToBase64UrlEncode(sha256HMACBytes(aSigSource,stringToUTFBytes(theKey)))

这将产生以下有效的 JWT:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.7ofvtkn0xlq3Eq3EqsE