Signing Documents

To send documents for signing, please use the following steps:

Prepare the encrypted PDF document to be sent to the signer gateway
Making a HTTPS post request to send the document
Receiving the signed document back

Step 1 – Preparing the encrypted payload

emSigner uses TLS and Data encryption in transit to protect your documents. To achieve this, the signer gateway uses a combination of a random session key and public key to encrypt both the request and session key.

To prepare the payload use the following steps

Create a unique session key for each request

//.NET Code
public static byte[] GetNewSessionKey()
{
    using (Aes myAes = Aes.Create("AES"))
    {
        myAes.KeySize = 256;
        myAes.GenerateKey();
        return myAes.Key;
    }
}

//Java Code
String JCE_PROVIDER = "BC";
public byte[] GenerateSessionKey() throws NoSuchAlgorithmException, NoSuchProviderException
{
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    KeyGenerator kgen = KeyGenerator.getInstance("AES", JCE_PROVIDER);
    kgen.init(256);
    SecretKey key = kgen.generateKey();
    byte[] symmKey = key.getEncoded();
    return symmKey;
}

Encrypt unique session key for each request

Every session key needs to be encrypted with Public Key of emSigner which will be shared as a .CER file. Please contact us if you already did not receive this file

//.NET Code
public static string EncryptWithPublicKey(byte[] stringToEncrypt)
{
    X509Certificate2 certificate;
    certificate = new X509Certificate2(AppDomain.CurrentDomain.BaseDirectory + "\\certificate.cer");
    byte[] cipherbytes = Convert.FromBase64String(Convert.ToBase64String(stringToEncrypt));
    RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)certificate.PublicKey.Key;
    byte[] cipher = rsa.Encrypt(cipherbytes, false);
    return Convert.ToBase64String(cipher);
}

//Java Code
public byte[] EncryptUsingPublicKey(byte[] data) throws IOException, GeneralSecurityException, Exception
{
    // encrypt the session key with the public key
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    PublicKey publicKey = null;
    byte[] bytevalue= readBytesFromFile("Give certificate.cer filepath ");
    //String certificatedata = "";
    CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
    //byte[] bytevalue = Base64.decode(certificatedata);
    InputStream streamvalue = new ByteArrayInputStream(bytevalue);
    java.security.cert.Certificate certificate = certificateFactory.generateCertificate(streamvalue);
    publicKey = certificate.getPublicKey();
    Cipher pkCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC");
    pkCipher.init(Cipher.ENCRYPT_MODE, publicKey);
    byte[] encSessionKey = pkCipher.doFinal(data);
    // System.out.println("ENC SESSION KEY : "+ encSessionKey.length);
    return encSessionKey;
}

Create JSON Payload

For PDF Files

Please use the parameters below to construct the JSON payload for PDF file signing

Parameter

Data Type

Description

Filetype*

String

Filetype=PDF, If file is PDF format.

File*

String

Compress the file using 7zip (Optional) and pass compressed base 64 string of file that needs to be signed. If you are compressing the document make sure you send additional parameter i.e. IsCompressed as TRUE, otherwise FALSE. Compression ratio is high for XML and DATA, whereas for PDF it is only 10% (Varies with size of the document). To know how to compress file, refer the section at the bottom of this page

IsCompressed

Boolean

Set to "True" if compressed data is sent. Otherwise "False"

ReferenceNumber *

String

Pass unique random number as reference number for each transaction request. Maximum of 20 characters. Example: 1213 Note: You can pass timestamp as a reference number to create uniqueness. You are not allowed to pass reference number which has been used for any of the previous transactions.

Name*

String

Pass the name of the signatory which will be displayed along with the signature.

Authtoken *

String

Pass valid unique Authtoken generated for your account.

SignatureType*

Integer

This parameter describes the signature mode to be enabled for completing the request. Currently, we support the following signature options i.e. dSign, eSign, eSignature, Digital Signatures (tokens), eSign 2.1 and eSign 3.2 and other signing types from third party trust service providers from time to time Digital Signature: Requires Crypto Token and valid digital signature issued by licensed Certifying Authorities to digitally sign the request. eSignature: eSignature is not valid in India, but it is widely accepted in other countries. eSign : eSign (Aadhar based signing) is valid ONLY in India. Specify below signature type values (comma separated) if you need specific signature options to be enabled in our gateway page. SignatureType=2, if you need digital signature as a signature option. SignatureType=3, if you need eSign as a signature option. SignatureType=4, if you need eSignature as signature option.

SignerID

String

This is an optional parameter. Value for this parameter can be passed if “eSign” Signature type is selected as one of the signature type values e.g xyz.123

IsCosign

Boolean

By default, this parameter would contain a FALSE value. Set this to TRUE, if you want to sign the document multiple times with different signatories. For security reasons, if you have only one signatory signing the document pass as false and also for the last signatory of your workflow/business flow you need to pass false so that document will not be allowed for further signing.

SelectPage*

String

Signature placeholder specification on which page the signature has to be added. Specify SelectPage=ALL, if you need a signature on all the pages of the document. SelectPage=FIRST, if you need a signature on the only first page of the document. SelectPage=LAST, if you need a signature on only last page of the document. SelectPage=EVEN, if you need a signature on all even pages of the document. For example: If the document consists of 10 pages then second, fourth, sixth, eighth and tenth pages contain a signature. SelectPage=ODD, if you need a signature on all odd pages of the document. For example: If the document consists of 10 pages then first, third, fifth, seventh and ninth pages contain a signature. SelectPage=SPECIFY, if you want to specify page numbers. For specifying page level coordinates, you need to pass additional parameter i.e. PageNumber which is explained below. SelectPage=PAGE LEVEL, if you want to specify page coordinates. For specifying page level coordinates, you need to pass additional parameter i.e. PagelevelCoordinates which is explained below.

PageNumber

Integer

Pass page numbers separated with a comma, where you wanted to see the signature in the document. For example: 1,2 Note: This is mandatory if SelectPage is SPECIFY.

PagelevelCoordinates

String

Specify coordinates of page level as PagelevelCoordinates= Pagenumber1,left,top,width,height;Pagenumber2,left,top,width,height For example: In 10 pages document you wanted the document to be signed on 1st and 6th page with some co-ordinates then specify PagelevelCoordinates = 1,7,10,60,120;6,45,20,60,120 Note: This is mandatory if SelectPage is PagelevelCoordinates.

SignaturePosition*

String

Signature placeholder specification where the signature has to be placed on a page. Specify SignaturePosition =Top-Left, if you need a signature on a top left position of the document. SignaturePosition =Top-Center, if you need a signature on a top center position of the document. SignaturePosition =Top-Right, if you need a signature on a top right position of the document. SignaturePosition =Middle-Left, if you need a signature on a middle left position of the document. SignaturePosition =Middle-Right, if you need a signature on a middle right position of the document. SignaturePosition =Middle-Center, if you need a signature on a middle center position of the document. SignaturePosition =Bottom-Left, if you need a signature on a bottom left position of the document. SignaturePosition =Bottom-Right, if you need a signature on a bottom right position of the document. SignaturePosition =Bottom-Center, if you need a signature on a bottom center position of the document. SignaturePosition =Customize, if you want to specify page coordinates. For specifying customize coordinates, you need to pass additional parameter i.e. CustomizeCoordinates which is explained below.

CustomizeCoordinates

String

CustomizeCoordinates=left,top,width,height For example: In 10 pages document you wanted the document to be signed on particular positions then specify CustomizeCoordinates=7,10,60,120 Note: This is mandatory if SignaturePosition is Customize.

PreviewRequired

Boolean

By default, this will be FALSE. If you want to show preview to the user when redirected to emSigner signer gateway page. Pass TRUE if the preview is required before signing the document.

Enableuploadsignature

Boolean

By default this will be FALSE, if enabled then the user will have the option to upload handwritten signature in emSigner Signer Gateway page and the same will be affixed on the signed PDF document And using this option will invalidate any signed document sent for signing again by another signatory. Pass TRUE if you want to enable upload signature option in the gateway. Note: If the user selects signature type as eSignature or combination of that, then at that time any of the parameter i.e. enable eSignature pad/enable draw signature/enable font signature/enable upload signature is mandatory. For digital signature, it is not mandatory.

Enablefontsignature

Boolean

By default this will be FALSE, if enabled then the user will have the option to choose or generate some font based signature in emSigner Signer Gateway page and the same will be affixed on the signed PDF document And using this option will invalidate any signed document sent for signing again by another signatory. Pass TRUE if you want to enable font based signatures to be visible in the gateway. Note: If the user selects signature type as eSignature or combination of that, then at that time any of the parameter i.e. enable eSignature pad/enable draw signature/enable font signature/enable upload signature is mandatory. For dSign, it is not mandatory.

EnableDrawSignature

Boolean

By default this will be FALSE, if enabled then the user will have the option to draw signature in emSigner Signer Gateway page and the same will be affixed on the signed PDF document And using this option will invalidate any signed document sent for signing again by another signatory. Pass TRUE if you want to enable draw signature option in the gateway. Note: If the user selects signature type as eSignature or combination of that, then at that time any of the parameter i.e. enable eSignature pad/enable draw signature/enable font signature/enable upload signature is mandatory. For dSign, it is not mandatory.

EnableeSignaturePad

Boolean

By default this will be FALSE, if enabled then the user will have the option to connect to third-party signature pads. Currently, we support Topaz signature pad in emSigner Signer Gateway page and the same will be affixed on the signed PDF document and using this option will invalidate any signed document sent for signing again by another signatory. Pass TRUE if you want to enable eSignature pad option in the gateway.

Storetodb

Boolean

By default this value would be FALSE. Pass it as TRUE if you want to save the response data with us. In case of failure you can request us by calling our API's before 48 hours (If Storetodb=TRUE).

EnableViewDocumentLink

Boolean

By default thisvalue willbe TRUE. Pass FALSE if document view link is not required. Note: Document link will be displayed only when preview is not enabled. If Preview required is TRUE then set "EnableViewDocumentLink" as FALSE.

SUrl*

String

Pass success URL, so that after successful signing signer gateway will send a response to that particular URL. The response handling can then be done by you after redirection to this URL.

Furl*

String

Pass failure URL, so that when there is a failure, signer gateway will send a response to that particular URL. The response handling can then be done by you after redirection to this URL.

Curl*

String

Pass cancel URL, so that when customer cancels the signer gateway process in the middle, signer gateway will send a response to that particular URL. The response handling can then be done by you after redirection to this URL.

For XML/CMS/DATA files

Please use the parameters below to construct the JSON payload for PDF file signing.

Parameter

Data Type

Description

Filetype*

String

Filetype=XML, if file is XML format. Filetype=DATA, if file is Text format.

File*

String

IsCompressed

Boolean

Set to "True" if compressed data is sent. Otherwise "False"

ReferenceNumber *

String

Authtoken *

String

Pass valid unique Authtoken generated for your account.

SignatureType*

Integer

This parameter describes the signature mode to be enabled for completing the request. Currently, we support the following signature options i.e. digital Signature, eSign, eSignature and other signature types from trust service providers Digital Signature: Requires Crypto Token and valid digital signature issued by licensed Certifying Authorities to digitally sign the request. eSignature: eSignature is not valid in India, but it is widely accepted in other countries. eSign : eSign (Aadhar based signing) is valid ONLY in India. Specify below signature type values (comma separated) if you need specific signature option to be enabled in our gateway page. SignatureType=2, if you need digital signature as a signature option. SignatureType=3, if you need eSign as a signature option. SignatureType=4, if you need eSignature as signature option.

SignerID

String

This is an optional parameter. Value for this parameter can be passed if “eSign” Signature type is selected as one of the signature type values e.g xyz.123

Storetodb

Boolean

By default this value would be FALSE. Pass it as TRUE if you want to save the response data with us. In case of failure you can request us by calling our API's before 48 hours (If Storetodb=TRUE).

EnableViewDocumentLink

Boolean

SUrl*

String

Pass success URL, so that after successful signing signer gateway will send a response to that particular URL. The response handling can then be done by you after redirection to this URL.

Furl*

String

Pass failure URL, so that when there is a failure, signer gateway will send a response to that particular URL. The response handling can then be done by you after redirection to this URL.

Curl*

String

For Hash files

Please use the parameters below to construct the JSON payload for PDF file signing

Parameter

Data Type

Description

Filetype*

String

Filetype=Hash, if file is an array of hashes.

Documentdetails

JSON Array

Pass Documentdetails in JSON array format with below details DocumentName: Name of document that needs to be signed. DocumentURL: URL of the document. Should be a HTTP / HTTPS URL for the document, accessible by the signer during the transaction permitted duration (maxUserWait Time). DocumentHash: Sha256 Hash of the document to be signed. Sample Documentdetails Json: [ { "DocumentName": "Document1", "DocumentURL": "https://www.xyz.com/document1", "DocumentHash": "96cac442e493b6e8dd97e2a28dc60d43ed6ff7c6e6d3a0e0490cfcb700046a4b" }, { "DocumentName": "Document2", "DocumentURL": "https://www.xyz.com/document2", "DocumentHash": "96cac442e493b6e8dd97e2a28dc60d43ed6ff7c6e6d3a0e0490cfcb700046a4a" }] Note: This array should contain max 5 document.

IsCompressed

Boolean

Set to "True" if compressed data is sent. Otherwise "False"

ReferenceNumber *

String

Authtoken *

String

Pass valid unique Authtoken generated for your account.

SignatureType*

Integer

SignerID

String

This is an optional parameter. Value for this parameter can be passed if “eSign” Signature type is selected as one of the signature type values e.g xyz.123

Storetodb

Boolean

By default this value would be FALSE. Pass it as TRUE if you want to save the response data with us. In case of failure you can request us by calling our API's before 48 hours (If Storetodb=TRUE).

EnableViewDocumentLink

Boolean

SUrl*

String

Pass success URL, so that after successful signing signer gateway will send a response to that particular URL. The response handling can then be done by you after redirection to this URL.

Furl*

String

Pass failure URL, so that when there is a failure, signer gateway will send a response to that particular URL. The response handling can then be done by you after redirection to this URL.

Curl*

String

Sample JSON Request

{
    "Name":"",
    "FileType":"PDF",
    "SignatureType":2,
    "SelectPage":"FIRST",
    "SignaturePosition":"Top-Left",
    "AuthToken":"",
    "File":"",
    "PageNumber":null,
    "PreviewRequired":true,
    "PagelevelCoordinates":null,
    "CustomizeCoordinates":null,
    "SUrl":"http://localhost:52322/Success",
    "FUrl":"http://localhost:52322/Error",
    "CUrl":"http://localhost:52322/Cancel",
    "ReferenceNumber":"REFDB100011",
    "Enableuploadsignature":true,
    "Enablefontsignature":true,
    "EnableDrawSignature":true,
    "EnableeSignaturePad":true,
    "IsCompressed":true,
    "IsCosign":true,
    "EnableViewDocumentLink ": true,
    "Storetodb":true,
    "IsGSTN":true,
    "IsGSTN3B":false
}

Encrypt JSON Payload

The JSON Payload needs to be encrypted with the Session Key that was generated as part of the first step.

//.NET Code
public static byte[] EncryptDataAES(byte[] toEncrypt, byte[] key)
{
    IBufferedCipher cipher = CipherUtilities.GetCipher("AES/ECB/PKCS7");
    cipher.Init(true, new KeyParameter(key));
    int outputSize = cipher.GetOutputSize(toEncrypt.Length);
    byte[] tempOP = new byte[outputSize];
    int processLen = cipher.ProcessBytes(toEncrypt, 0, toEncrypt.Length, tempOP, 0);
    int outputLen = cipher.DoFinal(tempOP, processLen);
    byte[] result = new byte[processLen + outputLen];
    System.Array.Copy(tempOP, 0, result, 0, result.Length);
    return result;
}

//Java Code
public byte[] EncryptUsingSessionKey(byte[] skey, byte[] data) throws InvalidCipherTextException
{
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new AESEngine(), new PKCS7Padding());
    cipher.init(true, new KeyParameter(skey));
    //
    int outputSize = cipher.getOutputSize(data.length);
    byte[] tempOP = new byte[outputSize];
    int processLen = cipher.processBytes(data, 0, data.length, tempOP, 0);
    int outputLen = cipher.doFinal(tempOP, processLen);
    byte[] result = new byte[processLen + outputLen];
    System.arraycopy(tempOP, 0, result, 0, result.length);
    return result;
}

Create Hash

//.NET Code
public static byte[] Generatehash256(string text)
{
    byte[] message = Encoding.UTF8.GetBytes(text);
    SHA256Managed hashString = new SHA256Managed();
    string hex = "";
    var hashValue = hashString.ComputeHash(message);
    return hashValue;
}

//Java Code
public static byte[] Generatehash256(string text)
{
    byte[] message = Encoding.UTF8.GetBytes(text);
    SHA256Managed hashString = new SHA256Managed();
    string hex = "";
    var hashValue = hashString.ComputeHash(message);
    return hashValue;
}

Encrypt Hash

Follow the steps used to Encrypt JSON payload to encrypt Hash of Document using the Session Key.

This is used as an added security measure to ensure document has not been tampered in transit.

Step 2 – Making an HTTPS post to send the document

Once you have completed Step 1, please send the payload to the URL using the format below

TEST URL – “https://testgateway.emsigner.com/eMsecure/V3_0/Index”

Type – HTTPS POST

Request Parameters

Parameter

Data Type

Description

Parameter 1 *

String

Encrypted Session Key

Parameter 2 *

String

Encrypted JSON Data

Parameter 3

String

Encrypted Hash

Once Signer Gateway receives the request, it authenticates by decrypting the all the values and compares them to check if there is any man in the middle attack and authorizes the request.
On successful authentication, it redirects the user to the gateway page where the user can view the data based on the request type.
On successful user authentication, signer gateway generates signed data/document with signed data and sends HTTPS POST response to the corporate success URL with Encrypted Signed data, Transaction status, Transaction number and reference number.
Here signed document is compressed using 7-zip (if the file is of larger size) and sent as a response. Signed data will be encrypted using AES encryption with session key received as part of the request.
If authentication fails, user will be redirected to the failure URL and error message will be displayed.

Below is a list of response parameters

Parameter

Data Type

Description

ReturnStatus

String

Returns Success if request is done successfully otherwise Failure

ErrorMessage

String

If ReturnStatus is "Failure" it will return an error message. If this is empty then request is a success. Check below error messages.

Returnvalue

String

Returns Encrypted Signed data, if signing is done successfully otherwise Failure

Transactionnumber

String

Returns unique transaction number for each request. To identify each new transaction in the ESGS Database, a unique identifier is created every time. This identifier is known as the Transaction number.

Referencenumber

String

Returns same reference number which has raised the request.

Below are the list of error codes and the error messages with their descriptions

Error Code

Error Message

Description

104

Invalid Authtoken

When invalid Authtoken is entered

105

You are not subscribed to this VAS item.

When No VAS feature is subscribed.

106

Cancelled by user

When client cancels the request

107

Invalid parameters

When any parameter is empty

108

You cannot use reference number which is already used in previous transactions.

When reference number is already used in previous transactions.

109

Invalid Request

When decryption of data failed

110

emSigner application is required to digitally sign the documents using token based signature.

When emSigner utility is not installed

111

emSigner application is required to digitally sign the documents using token based signature.

When utility not running in the system

112

emSigner application is required to digitally sign the documents using token based signature.

When port number is mismatch

113

Please update the emSigner utility for new updates

If Utility used is not the latest version.

114

eSignature is not applicable for XML and Data signing.

When trying to do eSignature for XML and Data files.

115

Only .jpg, .jpeg and .png files can be set as Signature Image.

While uploading signature image other than jpg, jpeg and png files Allowed file types are .jpg, .jpeg and .png

116

You can upload maximum of 200KB and minimum of 100KB file size.

While uploading big size file Ensure that the size of file should be between (100KB - 200KB)

117

Please connect the eSignature pad to sign and capture the signature image

When eSignature Pad is not connected

Compressing Documents (for large files)

//.NET Code
public string CompressFileLZMA(string InputFileName)
{
    string TransactionID = DateTime.Now.ToString("yyyyMMddHHmmssfff");
    string OutputFileName = System.Web.Configuration.WebConfigurationManager.AppSettings["filepath"] + TransactionID + "_" + Path.GetFileName(InputFileName.Split('.')[0]).ToString();
    Int32 dictionary = 1 << 23;
    Int32 posStateBits = 2;
    Int32 litContextBits = 3; // for normal files
    // UInt32 litContextBits = 0; // for 32-bit data
    Int32 litPosBits = 0;
    // UInt32 litPosBits = 2; // for 32-bit data
    Int32 algorithm = 2;
    Int32 numFastBytes = 128;
    string mf = "bt4";
    bool eos = true;
    bool stdInMode = false;
    SevenZip.Sdk.CoderPropId[] propIDs =  {
        SevenZip.Sdk.CoderPropId.DictionarySize,
        SevenZip.Sdk.CoderPropId.PosStateBits,
        SevenZip.Sdk.CoderPropId.LitContextBits,
        SevenZip.Sdk.CoderPropId.LitPosBits,
        SevenZip.Sdk.CoderPropId.Algorithm,
        SevenZip.Sdk.CoderPropId.NumFastBytes,
        SevenZip.Sdk.CoderPropId.MatchFinder,
        SevenZip.Sdk.CoderPropId.EndMarker
    };
    object[] properties = {
    (Int32)(dictionary),
    (Int32)(posStateBits),
    (Int32)(litContextBits),
    (Int32)(litPosBits),
    (Int32)(algorithm),
    (Int32)(numFastBytes),
    mf, eos
    };
    using (FileStream inStream = new FileStream(InputFileName, FileMode.Open))
    {
        using (FileStream outStream = new FileStream(OutputFileName, FileMode.Create))
            {
                SevenZip.Sdk.Compression.Lzma.Encoder encoder = new SevenZip.Sdk.Compression.Lzma.Encoder();
                encoder.SetCoderProperties(propIDs, properties);
                encoder.WriteCoderProperties(outStream);
                    Int64 fileSize;
                    if (eos || stdInMode)
                        fileSize = -1;
                            else
                            fileSize = inStream.Length;
                                for (int i = 0; i < 8; i++)
                                    outStream.WriteByte((Byte)(fileSize >> (8 * i)));
                                    encoder.Code(inStream, outStream, -1, -1, null);
            }
    }
    return OutputFileName;
 }

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//Java Code String JCE_PROVIDER = "BC"; public byte[] GenerateSessionKey() throws NoSuchAlgorithmException, NoSuchProviderException { Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); KeyGenerator kgen = KeyGenerator.getInstance("AES", JCE_PROVIDER); kgen.init(256); SecretKey key = kgen.generateKey(); byte[] symmKey = key.getEncoded(); return symmKey; }

//.NET Code public static string EncryptWithPublicKey(byte[] stringToEncrypt) { X509Certificate2 certificate; certificate = new X509Certificate2(AppDomain.CurrentDomain.BaseDirectory + "\\certificate.cer"); byte[] cipherbytes = Convert.FromBase64String(Convert.ToBase64String(stringToEncrypt)); RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)certificate.PublicKey.Key; byte[] cipher = rsa.Encrypt(cipherbytes, false); return Convert.ToBase64String(cipher); }

//Java Code public byte[] EncryptUsingPublicKey(byte[] data) throws IOException, GeneralSecurityException, Exception { // encrypt the session key with the public key Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); PublicKey publicKey = null; byte[] bytevalue= readBytesFromFile("Give certificate.cer filepath "); //String certificatedata = ""; CertificateFactory certificateFactory = CertificateFactory.getInstance("X509"); //byte[] bytevalue = Base64.decode(certificatedata); InputStream streamvalue = new ByteArrayInputStream(bytevalue); java.security.cert.Certificate certificate = certificateFactory.generateCertificate(streamvalue); publicKey = certificate.getPublicKey(); Cipher pkCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC"); pkCipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] encSessionKey = pkCipher.doFinal(data); // System.out.println("ENC SESSION KEY : "+ encSessionKey.length); return encSessionKey; }

{ "Name":"", "FileType":"PDF", "SignatureType":2, "SelectPage":"FIRST", "SignaturePosition":"Top-Left", "AuthToken":"", "File":"", "PageNumber":null, "PreviewRequired":true, "PagelevelCoordinates":null, "CustomizeCoordinates":null, "SUrl":"http://localhost:52322/Success", "FUrl":"http://localhost:52322/Error", "CUrl":"http://localhost:52322/Cancel", "ReferenceNumber":"REFDB100011", "Enableuploadsignature":true, "Enablefontsignature":true, "EnableDrawSignature":true, "EnableeSignaturePad":true, "IsCompressed":true, "IsCosign":true, "EnableViewDocumentLink ": true, "Storetodb":true, "IsGSTN":true, "IsGSTN3B":false }

//.NET Code public static byte[] EncryptDataAES(byte[] toEncrypt, byte[] key) { IBufferedCipher cipher = CipherUtilities.GetCipher("AES/ECB/PKCS7"); cipher.Init(true, new KeyParameter(key)); int outputSize = cipher.GetOutputSize(toEncrypt.Length); byte[] tempOP = new byte[outputSize]; int processLen = cipher.ProcessBytes(toEncrypt, 0, toEncrypt.Length, tempOP, 0); int outputLen = cipher.DoFinal(tempOP, processLen); byte[] result = new byte[processLen + outputLen]; System.Array.Copy(tempOP, 0, result, 0, result.Length); return result; }

//Java Code public byte[] EncryptUsingSessionKey(byte[] skey, byte[] data) throws InvalidCipherTextException { PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new AESEngine(), new PKCS7Padding()); cipher.init(true, new KeyParameter(skey)); // int outputSize = cipher.getOutputSize(data.length); byte[] tempOP = new byte[outputSize]; int processLen = cipher.processBytes(data, 0, data.length, tempOP, 0); int outputLen = cipher.doFinal(tempOP, processLen); byte[] result = new byte[processLen + outputLen]; System.arraycopy(tempOP, 0, result, 0, result.length); return result; }

//.NET Code public static byte[] Generatehash256(string text) { byte[] message = Encoding.UTF8.GetBytes(text); SHA256Managed hashString = new SHA256Managed(); string hex = ""; var hashValue = hashString.ComputeHash(message); return hashValue; }

//Java Code public static byte[] Generatehash256(string text) { byte[] message = Encoding.UTF8.GetBytes(text); SHA256Managed hashString = new SHA256Managed(); string hex = ""; var hashValue = hashString.ComputeHash(message); return hashValue; }

//.NET Code public string CompressFileLZMA(string InputFileName) { string TransactionID = DateTime.Now.ToString("yyyyMMddHHmmssfff"); string OutputFileName = System.Web.Configuration.WebConfigurationManager.AppSettings["filepath"] + TransactionID + "_" + Path.GetFileName(InputFileName.Split('.')[0]).ToString(); Int32 dictionary = 1 << 23; Int32 posStateBits = 2; Int32 litContextBits = 3; // for normal files // UInt32 litContextBits = 0; // for 32-bit data Int32 litPosBits = 0; // UInt32 litPosBits = 2; // for 32-bit data Int32 algorithm = 2; Int32 numFastBytes = 128; string mf = "bt4"; bool eos = true; bool stdInMode = false; SevenZip.Sdk.CoderPropId[] propIDs = { SevenZip.Sdk.CoderPropId.DictionarySize, SevenZip.Sdk.CoderPropId.PosStateBits, SevenZip.Sdk.CoderPropId.LitContextBits, SevenZip.Sdk.CoderPropId.LitPosBits, SevenZip.Sdk.CoderPropId.Algorithm, SevenZip.Sdk.CoderPropId.NumFastBytes, SevenZip.Sdk.CoderPropId.MatchFinder, SevenZip.Sdk.CoderPropId.EndMarker }; object[] properties = { (Int32)(dictionary), (Int32)(posStateBits), (Int32)(litContextBits), (Int32)(litPosBits), (Int32)(algorithm), (Int32)(numFastBytes), mf, eos }; using (FileStream inStream = new FileStream(InputFileName, FileMode.Open)) { using (FileStream outStream = new FileStream(OutputFileName, FileMode.Create)) { SevenZip.Sdk.Compression.Lzma.Encoder encoder = new SevenZip.Sdk.Compression.Lzma.Encoder(); encoder.SetCoderProperties(propIDs, properties); encoder.WriteCoderProperties(outStream); Int64 fileSize; if (eos || stdInMode) fileSize = -1; else fileSize = inStream.Length; for (int i = 0; i < 8; i++) outStream.WriteByte((Byte)(fileSize >> (8 * i))); encoder.Code(inStream, outStream, -1, -1, null); } } return OutputFileName; }