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Converting Mcrypt Rinjdael-128-CBC function to php-7.0

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0

I'm trying to do an ecrypt decrypt on php. An old function written by a colleague for the encryption and decryption using MCRYPT RINJDAEL-128-CBC is as follows.
Encrypt

 $key = pack('H*', $salt); 
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_MODE_CBC, $iv);
 return base64_encode($iv . $ciphertext);
 }

Decrypt

 $key = pack('H*', $salt);
 $ciphertext_dec = base64_decode($encodedText);
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv_dec = substr($ciphertext_dec, 0, $iv_size);
 $ciphertext_dec = substr($ciphertext_dec, $iv_size);
 return mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);
}```

Due to php deprecating Mcrypt and only uses Openssl, how would I write a function that can do exactly the same?

php aes

share|improve this question

asked Mar 25 at 14:40

Benjamin WongBenjamin Wong

1355 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Since you're using RINJDAEL-128 which is AES, you can use openssl_encrypt() with "AES-128-CBC".
  
  – t.m.adam
  Mar 29 at 6:01
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do I still use the mcrypt iv settings still?
  
  – Benjamin Wong
  Apr 14 at 11:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No, use openssl_cipher_iv_length() to get the IV size and use random_bytes() as a CSPRNG.
  
  – t.m.adam
  Apr 14 at 12:05
  
  

  
  
  
  

add a comment | 

0

I'm trying to do an ecrypt decrypt on php. An old function written by a colleague for the encryption and decryption using MCRYPT RINJDAEL-128-CBC is as follows.
Encrypt

 $key = pack('H*', $salt); 
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_MODE_CBC, $iv);
 return base64_encode($iv . $ciphertext);
 }

Decrypt

 $key = pack('H*', $salt);
 $ciphertext_dec = base64_decode($encodedText);
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv_dec = substr($ciphertext_dec, 0, $iv_size);
 $ciphertext_dec = substr($ciphertext_dec, $iv_size);
 return mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);
}```

Due to php deprecating Mcrypt and only uses Openssl, how would I write a function that can do exactly the same?

php aes

share|improve this question

asked Mar 25 at 14:40

Benjamin WongBenjamin Wong

1355 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Since you're using RINJDAEL-128 which is AES, you can use openssl_encrypt() with "AES-128-CBC".
  
  – t.m.adam
  Mar 29 at 6:01
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do I still use the mcrypt iv settings still?
  
  – Benjamin Wong
  Apr 14 at 11:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No, use openssl_cipher_iv_length() to get the IV size and use random_bytes() as a CSPRNG.
  
  – t.m.adam
  Apr 14 at 12:05
  
  

  
  
  
  

add a comment | 

I'm trying to do an ecrypt decrypt on php. An old function written by a colleague for the encryption and decryption using MCRYPT RINJDAEL-128-CBC is as follows.
Encrypt

 $key = pack('H*', $salt); 
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_MODE_CBC, $iv);
 return base64_encode($iv . $ciphertext);
 }

Decrypt

 $key = pack('H*', $salt);
 $ciphertext_dec = base64_decode($encodedText);
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv_dec = substr($ciphertext_dec, 0, $iv_size);
 $ciphertext_dec = substr($ciphertext_dec, $iv_size);
 return mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);
}```

Due to php deprecating Mcrypt and only uses Openssl, how would I write a function that can do exactly the same?

php aes

share|improve this question

asked Mar 25 at 14:40

Benjamin WongBenjamin Wong

1355 bronze badges

 $key = pack('H*', $salt); 
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
 $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_MODE_CBC, $iv);
 return base64_encode($iv . $ciphertext);
 }

 $key = pack('H*', $salt);
 $ciphertext_dec = base64_decode($encodedText);
 $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
 $iv_dec = substr($ciphertext_dec, 0, $iv_size);
 $ciphertext_dec = substr($ciphertext_dec, $iv_size);
 return mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);
}```

Due to php deprecating Mcrypt and only uses Openssl, how would I write a function that can do exactly the same?

share|improve this question

asked Mar 25 at 14:40

Benjamin WongBenjamin Wong

1355 bronze badges

share|improve this question

asked Mar 25 at 14:40

Benjamin WongBenjamin Wong

1355 bronze badges

asked Mar 25 at 14:40

Benjamin WongBenjamin Wong

1355 bronze badges

asked Mar 25 at 14:40

Benjamin WongBenjamin Wong

1355 bronze badges