- #Openssl encrypt how to
- #Openssl encrypt archive
- #Openssl encrypt pro
- #Openssl encrypt password
- #Openssl encrypt plus
#Openssl encrypt pro
Pro developer tip: Download and have a copy of the PHP source code locally so that, when the PHP documentation fails to live up to quality expectations, you can see what is actually happening behind the scenes. Hope this saves someone a trip to the PHP source code to figure out what the $options do. When it is not specified, Base64 encoded data is returned to the caller. When OPENSSL_RAW_DATA is specified, the returned data is returned as-is. OPENSSL_RAW_DATA does not affect the OpenSSL context but has an impact on the format of the data returned to the caller. Without using OPENSSL_ZERO_PADDING, you will automatically get PKCS#7 padding. So, OPENSSL_ZERO_PADDING disables padding for the context, which means that you will have to manually apply your own padding out to the block size. EVP_CIPHER_CTX_set_padding() enables or disables padding (enabled by default). So as we can see here, OPENSSL_ZERO_PADDING has a direct impact on the OpenSSL context. RETVAL_STRINGL(base64_str, base64_str_len, 0) RETVAL_STRINGL((char *)outbuf, outlen, 0) īase64_str = (char*)php_base64_encode(outbuf, outlen, &base64_str_len) Behind the scenes, in the source code for /ext/openssl/openssl.c:ĮVP_EncryptInit_ex(&cipher_ctx, NULL, NULL, key, (unsigned char *)iv) ĮVP_CIPHER_CTX_set_padding(&cipher_ctx, 0) Since the $options are not documented, I'm going to clarify what they mean here in the comments.
Hopefully it will help anyone looking to get started with this powerful library. It should lay the foundations for better understanding and making effective use of openssl with PHP.
#Openssl encrypt how to
There's a simple Cryptor class on GitHub called php-openssl-cryptor that demonstrates encryption/decryption and hashing with openssl, along with how to produce and consume the data in base64 and hex as well as binary.
#Openssl encrypt password
Hash the chosen encryption key (the password parameter) using openssl_digest() with a hash function such as sha256, and use the hashed value for the password parameter. Pass OPENSSL_RAW_DATA for the flags and encode the result if necessary after adding in the iv data.
Join the iv data to the encrypted result and extract the iv data again when decrypting. AES uses 16 byte blocks, so you need 16 bytes for the iv.
mcrypt_create_iv() is one choice for random data. Use different random data for the initialisation vector each time encryption is made with the same key. aes-256-gcm is preferable, but not usable until the openssl library is enhanced, which is due in PHP 7.1 This avoids potential security issues (so-called padding oracle attacks) and bloat from algorithms that pad data to a certain block size.
#Openssl encrypt plus
There's a lot of confusion plus some false guidance here on the openssl library.Īes-256-ctr is arguably the best choice for cipher algorithm as of 2016.
Create Two Random Keys And Save Them In Your Configuration File. It Is Almost Impossible To Crack Your Encryption. This Is The Most Secure Way To Encrypt And Decrypt Your Data,
#Openssl encrypt archive
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