How to implement a digital signature (dsacryptoserviceprovider) in Asp.net)

The process of digital signature is as follows:

Sender A sends data to receiver B. Sender a first performs hash function operations on the data to generate a summary of the information, and then encrypts the data with the private key to generate signature information, the information that a will send along with the signature information is sent to B. After receiving the information, B Also hashes the data and generates a summary of the information, then, use the public key and signature to verify whether the information has been written and modified.

Asp.net:

Namespace: using system. Security. cryptography needs to be introduced;

Reference content is as follows: /// <Summary> /// Generate a signature /// </Summary> /// <Param name = "sender"> </param> /// <Param name = "E"> </param> Protected void button#click (Object sender, eventargs E) { Dsacryptoserviceprovider objdsa = new dsacryptoserviceprovider (); Objdsa. fromxmlstring (tbxkey. Text ); Byte [] source = system. Text. utf8encoding. utf8.getbytes (tbxcontent. Text ); // Digital Signature Tbxsign. Text = bitconverter. tostring (objdsa. signdata (source )); } /// <Summary> /// Generate a random key /// </Summary> /// <Param name = "sender"> </param> /// <Param name = "E"> </param> Protected void btncreatemy_click (Object sender, eventargs E) { Dsacryptoserviceprovider objdsa = new dsacryptoserviceprovider (); Tbxcreatemy_publickey.text = objdsa. toxmlstring (false ); Tbxcreatemy_key.text = objdsa. toxmlstring (true ); } /// <Summary> /// Verify the signature /// </Summary> /// <Param name = "sender"> </param> /// <Param name = "E"> </param> Protected void button3_click (Object sender, eventargs E) { Dsacryptoserviceprovider objdsa = new dsacryptoserviceprovider (); Byte [] filehashvalue = new sha1cryptoserviceprovider (). computehash (system. Text. utf8encoding. utf8.getbytes (tbxcontentyz. Text )); String [] strsplit = tbxsignyz. Text. Split ('-'); Byte [] signedhash = new byte [strsplit. Length]; For (INT I = 0; I <strsplit. length; I ++) Signedhash [I] = byte. parse (strsplit [I], system. Globalization. numberstyles. allowhexspecifier ); Objdsa. fromxmlstring (tbxpublickeyyz. Text ); Bool ret = objdsa. verifysignature (filehashvalue, signedhash ); QCD. Core. Web. Messages. showdialog (Ret. tostring ()); }

HTML page code:

Reference content is as follows: <Form ID = "form1" runat = "server"> Random key generation: <asp: button id = "btncreatemy" runat = "server" text = "random key generation" onclick = "btncreatemy_click"/> <br/> Public Key: <asp: textbox id = "tbxcreatemy_publickey" runat = "server" textmode = "multiline" Height = "59px" readonly = "true" width = "711px"> </ASP: textbox> <br/> Private Key: <asp: textbox id = "tbxcreatemy_key" runat = "server" textmode = "multiline" Height = "59px" readonly = "true" width = "710px"> </ASP: textbox> <br/> <HR/> <Br/> Generate a signature: <br/> Original: & nbsp; <Asp: textbox id = "tbxcontent" runat = "server" textmode = "multiline" Height = "59px" width = "711px"> </ASP: textbox> & nbsp; <br/> Private Key: <Asp: textbox id = "tbxkey" runat = "server" textmode = "multiline" Height = "59px" width = "711px"> </ASP: textbox> <br/> Signature: <Asp: textbox id = "tbxsign" runat = "server" textmode = "multiline" Height = "59px" readonly = "true" width = "711px"> </ASP: textbox> <Br/> <Asp: button id = "button1" runat = "server" onclick = "button#click" text = "generate signature"/> <Br/> <Br/> <HR/> <Br/> Verify the signature: <br/> Original article: <asp: textbox id = "tbxcontentyz" runat = "server" textmode = "multiline" Height = "59px" width = "711px"> </ASP: textbox> <br/> Public Key: <asp: textbox id = "tbxpublickeyyz" runat = "server" textmode = "multiline" Height = "59px" width = "711px"> </ASP: textbox> <br/> Signature: <asp: textbox id = "tbxsignyz" runat = "server" textmode = "multiline" Height = "59px" width = "711px"> </ASP: textbox> <Br/> <Asp: button id = "button3" runat = "server" onclick = "button3_click" text = "Verify signature"/> </Form>

 

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