Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3/4TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

C Examples

Web API Categories

ASN.1
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Service Bus
Base64
Bounced Email
Box
CSR
CSV
Certificates
Compression
DKIM / DomainKey
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
ECC
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
Geolocation
Google APIs
Google Calendar
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text

HTTP
HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
Microsoft Graph
NTLM
OAuth1
OAuth2
OneDrive
OpenSSL
Outlook
PEM
PFX/P12
POP3
PRNG
REST
REST Misc
RSA Encryption
SCP
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
SharePoint
Socket/SSL/TLS
Spider
Stream
Tar Archive
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(C) JWE using PBES2 Key Wrapping

Demonstrates how to create and decrypt a JWE that using PBES2 key wrapping.

This example demonstrates PBES2 with HMAC SHA-256 and A128KW wrapping. It is also possible to do the following by simply changing the "alg" parameter:

  • PBES2 with HMAC SHA-384 and A192KW wrapping
  • PBES2 with HMAC SHA-512 and A256KW wrapping

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat C/C++ Library Downloads

MS Visual C/C++

Linux/CentOS C/C++

Alpine Linux C/C++

MAC OS X C/C++

armhf/aarch64 C/C++

C++ Builder

iOS C/C++

Android C/C++

Win Mobile 5.0/Pocket PC 2003

Solaris C/C++

FreeBSD C/C++

OpenBSD C/C++

MinGW C/C++

#include <C_CkJwe.h>
#include <C_CkJsonObject.h>
#include <C_CkPrng.h>

void ChilkatSample(void)
    {
    BOOL success;
    const char *plaintext;
    HCkJwe jwe;
    HCkJsonObject jweProtHdr;
    HCkPrng prng;
    int recipientIndex;
    const char *strJwe;
    HCkJwe jwe2;
    const char *originalPlaintext;

    //  This requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  Note: This example requires Chilkat v9.5.0.66 or greater.

    plaintext = "Live long and prosper.";

    jwe = CkJwe_Create();

    //  First build the JWE Protected Header..
    jweProtHdr = CkJsonObject_Create();
    CkJsonObject_AppendString(jweProtHdr,"alg","PBES2-HS256+A128KW");
    CkJsonObject_AppendString(jweProtHdr,"enc","A128GCM");

    //  PBES2 requires two additional parameters:
    //  1) A random salt parameter ("p2s") containing 8 or more bytes in base64url format.
    //  2) An iteration count parameter ("p2c").  A minimum count of 1000 is recommended.
    //     The iteration count is intended to make the PBES2 computation more expensive (time consuming)
    //     to prevent brute-force attacks.
    prng = CkPrng_Create();
    CkJsonObject_AppendString(jweProtHdr,"p2s",CkPrng_genRandom(prng,16,"base64url"));
    CkJsonObject_AppendString(jweProtHdr,"p2c","1000");

    printf("JWE Protected Header: %s\n",CkJsonObject_emit(jweProtHdr));
    printf("--\n");

    //  Don't forget to actually provide the protected header to the JWE object:
    CkJwe_SetProtectedHeader(jwe,jweProtHdr);

    //  Set the PBES2 password
    recipientIndex = 0;
    CkJwe_SetPassword(jwe,recipientIndex,"top secret");

    //  Encrypt and return the JWE:
    strJwe = CkJwe_encrypt(jwe,plaintext,"utf-8");
    if (CkJwe_getLastMethodSuccess(jwe) != TRUE) {
        printf("%s\n",CkJwe_lastErrorText(jwe));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(jweProtHdr);
        CkPrng_Dispose(prng);
        return;
    }

    //  Show the JWE we just created:
    printf("%s\n",strJwe);

    //  Decrypt the JWE.
    jwe2 = CkJwe_Create();
    success = CkJwe_LoadJwe(jwe2,strJwe);
    if (success != TRUE) {
        printf("%s\n",CkJwe_lastErrorText(jwe2));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(jweProtHdr);
        CkPrng_Dispose(prng);
        CkJwe_Dispose(jwe2);
        return;
    }

    //  Set the PBES2 password
    CkJwe_SetPassword(jwe2,recipientIndex,"top secret");

    //  Decrypt.
    originalPlaintext = CkJwe_decrypt(jwe2,0,"utf-8");
    if (CkJwe_getLastMethodSuccess(jwe2) != TRUE) {
        printf("%s\n",CkJwe_lastErrorText(jwe2));
        CkJwe_Dispose(jwe);
        CkJsonObject_Dispose(jweProtHdr);
        CkPrng_Dispose(prng);
        CkJwe_Dispose(jwe2);
        return;
    }

    printf("original text: \n");
    printf("%s\n",originalPlaintext);

    //  Sample output:

    //  JWE Protected Header: {"alg":"PBES2-HS256+A128KW","enc":"A128GCM","p2s":"z39rTEfRy1T1Yn_D1mZRlg","p2c":"1000"}
    //  --
    //  eyJhbGciOiJQQkVTMi1IUzI1NitBMTI4S1ciLCJlbmMiOiJBMTI4R0NNIiwicDJzIjoiejM5clRFZlJ5MVQxWW5fRDFtWlJsZyIsInAyYyI6IjEwMDAifQ.koYt6PrFmYwcwdcT7ZcvXHA1d-Xez5h4.luGlbvEnZp-7IsBOj42Yhw.YMTcfLf8Qe4zazozGV2OAu3cUdQ8Kg.rWub47ESWkc6IqZJTvSTmg
    //  original text:
    //  Live long and prosper.


    CkJwe_Dispose(jwe);
    CkJsonObject_Dispose(jweProtHdr);
    CkPrng_Dispose(prng);
    CkJwe_Dispose(jwe2);

    }

 

© 2000-2019 Chilkat Software, Inc. All Rights Reserved.