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1. 前言

        今天做一个三方接口，接口文档描述签名采用MD5，但是实际测试过程中，始终校验不通过，经过和三方沟通，才知道采用的是HMAC-MD5。由于Delphi7没有对HMAC的支持，则采用XE版本来支持。本次使用Delphi XE 10.3.3、Delphi 7来实现。

        HMAC 散列消息认证码 (Hash-based Message Authentication Code)，它是一种基于加密哈希函数和共享密钥的消息认证协议。它是一种给消息加上数字签名的方法，这个签名是根据消息内容和一个共享密钥生成的，只有知道密钥的人才能生成或验证这个签名。
        HMAC - https://baike.baidu.com/item/hmac/7307543
        在线验证 https://www.btool.cn/hmac-generator

2. Delphi XE 10.3.3 实现动态库

2.1 工程文件 hmactool.dpr

library hmactool;{HMAC 散列消息认证码 (Hash-based Message Authentication Code)它是一种基于加密哈希函数和共享密钥的消息认证协议。它是一种给消息加上数字签名的方法，这个签名是根据消息内容和一个共享密钥生成的，只有知道密钥的人才能生成或验证这个签名。HMAC - https://baike.baidu.com/item/hmac/7307543在线验证 https://www.btool.cn/hmac-generator
}usesWinapi.Windows,System.SysUtils,System.Classes,InterfaceDll in 'InterfaceDll.pas';{$R *.res}exportsdll_hmac_md5,dll_hmac_sha1,dll_hmac_sha2;procedure DLLHandler(Reason: integer);
varbuf: array[0..1023] of char;
begincase Reason ofDLL_PROCESS_DETACH: //释放DLL时beginend;DLL_Process_Attach: //加载DLL时beginend;DLL_Thread_Attach: //主进程创建一个新线程时beginend;DLL_Thread_Detach: //主进程结束一个线程时beginend;end;
end;beginDLLProc := @DLLHandler;DLLHandler(DLL_Process_Attach);
end.

2.2 接口文件 InterfaceDll.pas

unit InterfaceDll;interfaceusesSystem.SysUtils, System.Hash;varErrInfo: WideString;function dll_hmac_md5(sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall;function dll_hmac_sha1(sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall;function dll_hmac_sha2(iType: Byte; sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall;implementationfunction dll_hmac_md5(sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall;
varKey, Data: WideString;Hash: THashMD5;HMAC: WideString;
beginData := Trim(sIn);Key:= Trim(sKey);Hash := THashMD5.Create;HMAC := Hash.GetHMAC(Data, Key);sOut:= PWideChar(HMAC);result:= 0;
end;function dll_hmac_sha1(sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall;
varKey, Data: WideString;Hash: THashSHA1;HMAC: WideString;
beginData := Trim(sIn);Key:= Trim(sKey);Hash := THashSHA1.Create;HMAC := Hash.GetHMAC(Data, Key);sOut:= PWideChar(HMAC);result:= 0;
end;function dll_hmac_sha2(iType: Byte; sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall;
varKey, Data: WideString;Hash: THashSHA2;HMAC: WideString;
beginData := Trim(sIn);Key:= Trim(sKey);Hash := THashSHA2.Create(THashSHA2.TSHA2Version(iType));HMAC := Hash.GetHMAC(Data, Key, THashSHA2.TSHA2Version(iType));sOut:= PWideChar(HMAC);result:= 0;
end;end.

3. Delphi 7 实现Demo

3.1 工程文件 D7Demo.dpr

program D7Demo;usesForms,uDemo in 'uDemo.pas' {FrmMain};{$R *.res}beginApplication.Initialize;Application.CreateForm(TFrmMain, FrmMain);Application.Run;
end.

3.2 窗体代码 uDemo.pas

unit uDemo;interfaceusesWindows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs, StdCtrls, ComCtrls;constdllname= 'hmactool.dll';typeTFrmMain = class(TForm)redt1: TRichEdit;btn1: TButton;edt1: TEdit;edt2: TEdit;lbl1: TLabel;lbl2: TLabel;lbl3: TLabel;btn2: TButton;grp1: TGroupBox;btn3: TButton;rb1: TRadioButton;rb2: TRadioButton;rb3: TRadioButton;rb4: TRadioButton;rb5: TRadioButton;rb6: TRadioButton;procedure btn1Click(Sender: TObject);procedure btn2Click(Sender: TObject);procedure btn3Click(Sender: TObject);private{ Private declarations }public{ Public declarations }end;function dll_hmac_md5(pIn, pKey: PWideChar; var pOut: PWideChar): Byte; stdcall; external dllname;function dll_hmac_sha1(sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall; external dllname;function dll_hmac_sha2(iType: Byte; sIn, sKey: PWideChar; var sOut: PWideChar): Byte; stdcall; external dllname;varFrmMain: TFrmMain;implementation{$R *.dfm}procedure TFrmMain.btn1Click(Sender: TObject);
varsIn, sKey, sOut: WideString;pOut: PWideChar;iRet: Byte;
beginsIn:= StringReplace(Trim(redt1.Lines.Text),#13#10,'',[rfReplaceAll,rfIgnoreCase]);sKey:= Trim(edt2.Text);iRet:= dll_hmac_md5(PWideChar(sIn), PWideChar(sKey), pOut);if (iRet= 0) thenbeginedt1.Text:= UTF8Decode(pOut);end;
end;procedure TFrmMain.btn2Click(Sender: TObject);
varsIn, sKey, sOut: WideString;pOut: PWideChar;iRet: Byte;
beginsIn:= StringReplace(Trim(redt1.Lines.Text),#13#10,'',[rfReplaceAll,rfIgnoreCase]);sKey:= Trim(edt2.Text);iRet:= dll_hmac_sha1(PWideChar(sIn), PWideChar(sKey), pOut);if (iRet= 0) thenbeginedt1.Text:= UTF8Decode(pOut);end;
end;procedure TFrmMain.btn3Click(Sender: TObject);
varsIn, sKey, sOut: WideString;pOut: PWideChar;iType, iRet: Byte;
beginif rb1.Checked theniType:= 0else if rb2.Checked theniType:= 1else if rb3.Checked theniType:= 2else if rb4.Checked theniType:= 3else if rb5.Checked theniType:= 4else if rb6.Checked theniType:= 5;sIn:= StringReplace(Trim(redt1.Lines.Text),#13#10,'',[rfReplaceAll,rfIgnoreCase]);sKey:= Trim(edt2.Text);iRet:= dll_hmac_sha2(iType, PWideChar(sIn), PWideChar(sKey), pOut);if (iRet= 0) thenbeginedt1.Text:= UTF8Decode(pOut);end;
end;end.

4. 最终效果

        测试了MD5、SHA1、SHA224、SHA256、SHA384、SHA512、SHA512-224、SHA512-256都可行，以下就贴出其中三个效果图吧，其他就不贴了。