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Const sBASE_64_CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" Function Base64encode(ByVal asContents) Dim lnPosition Dim lsResult Dim Char1 Dim Char2 Dim Char3 Dim Char4 Dim Byte1 Dim Byte2 Dim Byte3 Dim SaveBits1 Dim SaveBits2 Dim lsGroupBinary Dim lsGroup64 If Len(asContents) Mod 3 > 0 Then asContents = asContents & String(3 - (Len(asContents) Mod 3), " ") lsResult = "" For lnPosition = 1 To Len(asContents) Step 3 lsGroup64 = "" lsGroupBinary = Mid(asContents, lnPosition, 3) Byte1 = Asc(Mid(lsGroupBinary, 1, 1)): SaveBits1 = Byte1 And 3 Byte2 = Asc(Mid(lsGroupBinary, 2, 1)): SaveBits2 = Byte2 And 15 Byte3 = Asc(Mid(lsGroupBinary, 3, 1)) Char1 = Mid(sBASE_64_CHARACTERS, ((Byte1 And 252) 4) + 1, 1) Char2 = Mid(sBASE_64_CHARACTERS, (((Byte2 And 240) 16) Or (SaveBits1 * 16) And &HFF) + 1, 1) Char3 = Mid(sBASE_64_CHARACTERS, (((Byte3 And 192) 64) Or (SaveBits2 * 4) And &HFF) + 1, 1) Char4 = Mid(sBASE_64_CHARACTERS, (Byte3 And 63) + 1, 1) lsGroup64 = Char1 & Char2 & Char3 & Char4 lsResult = lsResult + lsGroup64 Next Base64encode = lsResult End Function 返回类别: 教程 上一教程: 将ADO方便的转化为XML文件 下一教程: 不用WINRAR将网络空间上的文件打包下载 您可以阅读与"一段加密函数(BASE64)"相关的教程: · 一段加密函数 · Serv-U软件密码加密函数 · 一段在ASP中加密与解密对应的函数 · 关于ASP,ASP.NET,VB.NET里的MD5加密函数 · 如何用ASP进行BASE64加密 |
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