Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

C# Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Code Signing
Compression
DKIM / DomainKey
DNS
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
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
MS Storage Providers
Microsoft Graph
Misc
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl

 

 

 

(C#) Duplicate PHP's openssl_encrypt and openssl_random_pseudo_bytes

Demonstrates how to duplicate PHP's openssl_encrypt function. (https://www.php.net/manual/en/function.openssl-encrypt.php)

For more information, see https://www.php.net/manual/en/function.openssl-encrypt.php

Chilkat .NET Downloads

Chilkat .NET Assemblies

Chilkat for .NET Core

Chilkat for Mono

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

// Duplicates thw following PHP script:

// $text = "This is a test";
// $passphrase = "my password";
// $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length("AES-256-CBC"));
// $crypted = base64_encode($iv.openssl_encrypt($text, "AES-256-CBC", $passphrase, OPENSSL_RAW_DATA, $iv));
// echo $crypted;

bool success;
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

string text = "This is a test";
string passphrase = "my password";

// AES is a block cipher.  The IV size for any block cipher is the size of the block, which is defined by the encryption algorithm. 
// For AES, the block size is always 16 bytes, regardless of key size (i.e. 128-bits, 192-bits, or 256-bits).
// Therefore, generate 16 random bytes for the IV.
crypt.EncodingMode = "base64";
string ivBase64 = crypt.GenRandomBytesENC(16);

Debug.WriteLine("Generated IV = " + ivBase64);

// Because we're doing AES-256-CBC, the key length must be 256-bits (i.e. 32 bytes).
// Given that our passphrase is a us-ascii string that can be shorter or longer than 32-bytes, we need to 
// somehow transform the passphrase to a 32-byte secret key.  We need to know what openssl_encrypt does.
// Here's the answer from the openssl_encrypt documentation:
// 
// "If the passphrase is shorter than expected, it is silently padded with NUL characters; 
// if the passphrase is longer than expected, it is silently truncated."

// OK.... so let's pad or shorten to get a 32-byte key.
Chilkat.BinData bdKey = new Chilkat.BinData();
bdKey.AppendString(passphrase,"utf-8");

int sz = bdKey.NumBytes;
if (sz > 32) {
    bdKey.RemoveChunk(32,sz - 32);
}
else {
    bdKey.Clear();
    bdKey.AppendPadded(passphrase,"utf-8",false,32);
}

// Setup for encryption.
crypt.CryptAlgorithm = "aes";
crypt.KeyLength = 256;
crypt.SetEncodedIV(ivBase64,"base64");
crypt.SetEncodedKey(bdKey.GetEncoded("base64"),"base64");

// Encrypt and base64 encode.
string cipherText64 = crypt.EncryptStringENC(text);

// The PHP code fragment above returns the base64 encoded bytes of the IV and the encrypted text.
// So let's do that..
Chilkat.BinData bd = new Chilkat.BinData();
bd.AppendEncoded(ivBase64,"base64");
bd.AppendEncoded(cipherText64,"base64");
string result = bd.GetEncoded("base64");

Debug.WriteLine("result = " + result);

// Sample output:
// dN0vS1O0cWi5BbLAAY+NTf7bs3S27xzPf11RkG47sjs=

// Now let's decrypt from the output...

// Setup for decryption.
crypt.CryptAlgorithm = "aes";
crypt.KeyLength = 256;
crypt.SetEncodedKey(bdKey.GetEncoded("base64"),"base64");

Chilkat.BinData bdResult = new Chilkat.BinData();
bdResult.AppendEncoded(result,"base64");
crypt.SetEncodedIV(bdResult.GetEncodedChunk(0,16,"base64"),"base64");

// Remove the IV (first 16 bytes) from the result.
bdResult.RemoveChunk(0,16);
success = crypt.DecryptBd(bdResult);
string originalText = bdResult.GetString("utf-8");

Debug.WriteLine("original text = " + originalText);

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.