Php Openssl Aes 256 Key Generator

07.12.2020by admin

length of the data < length of the private key ..so i divided the message while taking it,put a ':::'.then again encrpt it. look at the pgm to get an idea about this.. 
<?php 
class cry 
{ 
# generate a 1024 bit rsa private key, ask for a passphrase to encrypt it and save to file 
 //openssl genrsa -des3 -out /path/to/privatekey 1024 
 # generate the public key for the private key and save to file 
 //openssl rsa -in /path/to/privatekey -pubout -out /path/to/publickey 
 //programatically using php-openssll 
 //This will call while registration 
function gen_cert($userid) 
 { 
$dn = array('countryName' => 'XX', 'stateOrProvinceName' => 'State', 'localityName' => 'SomewhereCity', 'organizationName' =>'MySelf', 'organizationalUnitName' => 'Whatever', 'commonName' => 'mySelf', 'emailAddress' => 'user@example.com'); 
//Passphrase can be taken during registration 
 //Here its initialized to 1234 for sample 
$privkeypass = 'root'; 
$numberofdays = 365; 
//RSA encryption and 1024 bits length 
$privkey = openssl_pkey_new(array('private_key_bits' => 1024,'private_key_type' => OPENSSL_KEYTYPE_RSA)); 
$csr = openssl_csr_new($dn, $privkey); 
$sscert = openssl_csr_sign($csr, null, $privkey, $numberofdays); 
openssl_x509_export($sscert, $publickey); 
openssl_pkey_export($privkey, $privatekey, $privkeypass); 
openssl_csr_export($csr, $csrStr); 
//Generated keys are stored into files 
$fp=fopen('../PKI/private/$userid.key','w'); 
fwrite($fp,$privatekey); 
fclose($fp); 
$fp=fopen('../PKI/public/$userid.crt','w'); 
fwrite($fp,$publickey); 
fclose($fp); 
 } 
//Encryption with public key 
function encrypt($source,$rc) 
 { 
//path holds the certificate path present in the system 
$path='../PKI/public/server.crt'; 
$fp=fopen($path,'r'); 
$pub_key=fread($fp,8192); 
fclose($fp); 
openssl_get_publickey($pub_key); 
//$source='; 
 //$source='sumanth ahoiadodakjaksdsa;ldadkkllksdalkalsdl;asld;ls sumanthasddddddddddddddddddddddddddddddddfsdfsffdfsdfsumanth'; 
$j=0; 
$x=strlen($source)/10; 
$y=floor($x); 
 for($i=0;$i<$y;$i++) 
 { 
$crypttext='; 
openssl_public_encrypt(substr($source,$j,10),$crypttext,$pub_key);$j=$j+10; 
$crt.=$crypttext; 
$crt.=':::'; 
 } 
 if((strlen($source)%10)>0) 
 { 
openssl_public_encrypt(substr($source,$j),$crypttext,$pub_key); 
$crt.=$crypttext; 
 } 
 return($crt); 
 } 
//Decryption with private key 
function decrypt($crypttext,$userid) 
 { 
$passphrase='root'; 
$path='../PKI/private/server.key'; 
$fpp1=fopen($path,'r'); 
$priv_key=fread($fpp1,8192); 
fclose($fpp1); 
$res1= openssl_get_privatekey($priv_key,$passphrase); 
$tt=explode(':::',$crypttext); 
$cnt=count($tt); 
$i=0; 
 while($i<$cnt) 
 { 
openssl_private_decrypt($tt[$i],$str1,$res1); 
$str.=$str1; 
$i++; 
 } 
 return $str; 
 } 
 function sign($source,$rc) 
 { 
$has=sha1($source); 
$source.='::'; 
$source.=$has; 
$path='../PKI/public/$rc.crt'; 
$fp=fopen($path,'r'); 
$pub_key=fread($fp,8192); 
fclose($fp); 
openssl_get_publickey($pub_key); 
openssl_public_encrypt($source,$mese,$pub_key); 
 return $mese; 
 } 
 function verify($crypttext,$userid) 
 { 
$passphrase='root'; 
$path='../PKI/private/$userid.key'; 
$fpp1=fopen($path,'r'); 
$priv_key=fread($fpp1,8192); 
fclose($fpp1); 
$res1= openssl_get_privatekey($priv_key,$passphrase); 
openssl_private_decrypt($crypttext,$has1,$res1); 
 list($c1,$c2)=split('::',$has1); 
$has=sha1($c1); 
 if($has$c2) 
 { 
$message=$c1; 
 return $message; 
 } 
 } 
 } 
?>

Php Openssl Aes 256 Key Generator Replacement

OpenSSL Generate 4096-bit Certificate (Public/Private Key Encryption) with SHA256 Fingerprint

Php Openssl Aes 256 Key Generator Download

How to securely generate an IV for AES CBC Encryption? Ask Question Asked 8 years. My question is, how to securely generate the IV with OPENSSL and PHP? Generate a key in PHP for AES 256. Php,openssl function generate random encoding, how can i correctly save encrypted text in database. You use a key generator, and if not available, a random number generator to generate a key of the correct size, in this case 32 bytes. You can feed that to the cipher implementation. Then, if you need hexadecimals then you can convert or encode them explicitly to hexadecimals after. Hi experts, Please help me to create AES 128 encrypted openssl certificate which can be used for Apache SSL configuration. I am able to create RSA/DSA keys with AES128 encryption using following command. # openssl genrsa -aes128 -out key.pem Is it possible to create AES 128 encrypted key without.

gencert.sh

# Generate Private Key and Certificate using RSA 256 encryption (4096-bit key)

openssl req -x509 -newkey rsa:4096 -keyout privatekey.pem -out certificate.pem -days 365

# Alternatively, setting the '-newkey' parameter to 'rsa:2048' will generate a 2048-bit key.

# Generate PKCS#12 (P12) file for cert; combines both key and certificate together

openssl pkcs12 -export -inkey privatekey.pem -in certificate.pem -out cert.pfx

# Generate SHA256 Fingerprint for Certificate and export to a file

openssl x509 -noout -fingerprint -sha256 -inform pem -in certificate.pem >> fingerprint.txt

# Generate SHA1 Fingerprint for Certificate and export to a file

#openssl x509 -noout -fingerprint -sha1 -inform pem -in certificate.pem >> fingerprint.txt

# FYI, it's best practice to use SHA256 instead of SHA1 for better security, but this shows how to do it if you REALLY need to.

commented Nov 7, 2019

128 Bit Aes Key Generator

Here's a couple useful links related to this:

Generate Random Aes Key

Microsoft Xp Professional Product Key Generator

Generate A New Key Pair With Ssh-keygen

Comments are closed.