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Notice: I am not an encryption expert! I didn’t like having my SMTP email password being stored in my database in plain text, so this was my solution. If you are doing something similar, this should be fine. If you are storing SSN or credit card data, you will want to consult with an encryption expert!
- AES was designed to be efficient in both hardware and software, and supports a block length of 128 bits and key lengths of 128, 192, and 256 bits. How secure is AES encryption algorithm? AES encryption is used by U.S. For securing sensitive but unclassified material, so we can say it is enough secure.
- PHP OpenSSL functions opensslencrypt and openssldecrypt seem to use PKCS5/7 style padding for all symmetric ciphers. Upon this, you can't use them to encrypt using null byte padding or to decrypt null byte padded data. The developers of the wrapper forgot the padding scheme flags.
The php manual is currently lacking documentation for the “openssl_encrypt” and “openssl_decrypt” functions, so it took me awhile to piece together what I needed to do to get these functions working as a replacement for mcrypt, which has been unmaintained since 2003. Hopefully this will help you get to where you need to go with encrypting and decrypting your data.
PHP OpenSSL functions opensslencrypt and openssldecrypt seem to use PKCS5/7 style padding for all symmetric ciphers. Upon this, you can't use them to encrypt using null byte padding or to decrypt null byte padded data. The developers of the wrapper forgot the padding scheme flags. I have tried to use the key and cyphertext to decode the message using the website “aesencryption.net” and OpenSSL with the following command: openssl enc -d -aes-128-ecb -base64 -in cypherText.txt -out /dev/stdout -pass pass:key The online decoder gives me unreadable text, and OpenSSL produces a bad magic number. Hi experts, Please help me to create AES 128 encrypted openssl certificate which can be used for Apache SSL configuration. Add ssh key github. 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.
First, you will need to generate a pseudo-random string of bytes that you will use as a 256 bit encryption key. The requested length will be 32 (since 32 bytes = 256 bits). If you echo out the key, you will notice that your browser chokes. In order to avoid possible corruption when storing the key in a file or database, we will base64_encode it. Use the code below to generate your key(s). The key will need to be saved since the data has to be encoded and decoded using the same key. If your encrypted data is being stored in a database, your encryption key will most likely need to be stored in a configuration file.
2 4 6 8 10 | // Remove the base64 encoding from our key // Generate an initialization vector $iv=openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc')); // Encrypt the data using AES 256 encryption in CBC mode using our encryption key and initialization vector. $encrypted=openssl_encrypt($data,'aes-256-cbc',$encryption_key,0,$iv); // The $iv is just as important as the key for decrypting, so save it with our encrypted data using a unique separator (::) } |
Now for the decryption function:
2 4 6 | // Remove the base64 encoding from our key // To decrypt, split the encrypted data from our IV - our unique separator used was '::' list($encrypted_data,$iv)=explode('::',base64_decode($data),2); returnopenssl_decrypt($encrypted_data,'aes-256-cbc',$encryption_key,0,$iv); |
Putting it all together:
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 | //$key is our base64 encoded 256bit key that we created earlier. You will probably store and define this key in a config file. $key='bRuD5WYw5wd0rdHR9yLlM6wt2vteuiniQBqE70nAuhU='; functionmy_encrypt($data,$key){ $encryption_key=base64_decode($key); $iv=openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc')); // Encrypt the data using AES 256 encryption in CBC mode using our encryption key and initialization vector. $encrypted=openssl_encrypt($data,'aes-256-cbc',$encryption_key,0,$iv); // The $iv is just as important as the key for decrypting, so save it with our encrypted data using a unique separator (::) } functionmy_decrypt($data,$key){ $encryption_key=base64_decode($key); // To decrypt, split the encrypted data from our IV - our unique separator used was '::' list($encrypted_data,$iv)=explode('::',base64_decode($data),2); returnopenssl_decrypt($encrypted_data,'aes-256-cbc',$encryption_key,0,$iv); $password_plain='abc123'; //our data being encrypted. This encrypted data will probably be going into a database //since it's base64 encoded, it can go straight into a varchar or text database field without corruption worry $password_encrypted=my_encrypt($password_plain,$key); //now we turn our encrypted data back to plain text $password_decrypted=my_decrypt($password_encrypted,$key); |
Aes 256 Java
The code above will output the following. Note that the encrypted string in the middle will change each time you run the code thanks to our initialization vector: