(PHP 5 >= 5.3.0, PHP 7)
openssl_encrypt — 锟斤拷锟斤拷锟斤拷锟斤拷
$data
, string $method
, string $key
[, int $options = 0
[, string $iv = ""
[, string &$tag = NULL
[, string $aad = ""
[, int $tag_length = 16
]]]]] ) : string锟斤拷指锟斤拷锟侥凤拷式锟斤拷 key 锟斤拷锟斤拷锟斤拷锟捷ｏ拷锟斤拷锟斤拷原始锟斤拷 base64 锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷锟斤拷
data锟斤拷锟斤拷锟杰碉拷锟斤拷锟斤拷锟斤拷息锟斤拷锟捷★拷
method锟斤拷锟斤拷学锟斤拷式锟斤拷openssl_get_cipher_methods() 锟缴伙拷取锟斤拷效锟斤拷锟诫方式锟叫憋拷
keykey锟斤拷
options
options 锟斤拷锟斤拷锟铰憋拷堑陌锟轿伙拷锟�
OPENSSL_RAW_DATA 锟斤拷
OPENSSL_ZERO_PADDING锟斤拷
iv锟斤拷 NULL 锟侥筹拷始锟斤拷锟斤拷锟斤拷锟斤拷
tag使锟斤拷 AEAD 锟斤拷锟斤拷模式锟斤拷GCM 锟斤拷 CCM锟斤拷时锟斤拷锟斤拷锟矫碉拷锟斤拷证锟斤拷签锟斤拷
aad锟斤拷锟接碉拷锟斤拷证锟斤拷锟捷★拷
tag_length
锟斤拷证 tag 锟侥筹拷锟饺★拷GCM 模式时锟斤拷锟斤拷锟侥凤拷围锟斤拷 4 锟斤拷 16锟斤拷
锟缴癸拷时锟斤拷锟截硷拷锟杰猴拷锟斤拷址锟斤拷锟斤拷锟� 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷
method 锟斤拷锟斤拷未知锟姐法时锟斤拷锟斤拷锟斤拷 E_WARNING 锟斤拷锟斤拷拇锟斤拷锟�
iv 锟斤拷锟斤拷锟斤拷址锟斤拷锟绞憋拷锟斤拷锟� E_WARNING 锟斤拷锟斤拷拇锟斤拷锟�
| 锟芥本 | 说锟斤拷 |
|---|---|
| 5.3.3 |
锟斤拷锟斤拷 iv 锟斤拷锟斤拷锟斤拷
|
| 5.4.0 |
raw_output 锟侥碉拷 options锟斤拷
|
| 7.1.0 | 锟斤拷锟斤拷锟斤拷 tag锟斤拷aad锟斤拷tag_length 锟斤拷锟斤拷 |
Example #1 PHP 7.1+ 锟斤拷 GCM 模式锟斤拷 AES 锟斤拷证锟斤拷锟斤拷锟斤拷锟斤拷
<?php
//$key should have been previously generated in a cryptographically safe way, like openssl_random_pseudo_bytes
$plaintext = "message to be encrypted";
$cipher = "aes-128-gcm";
if (in_array($cipher, openssl_get_cipher_methods()))
{
$ivlen = openssl_cipher_iv_length($cipher);
$iv = openssl_random_pseudo_bytes($ivlen);
$ciphertext = openssl_encrypt($plaintext, $cipher, $key, $options=0, $iv, $tag);
//store $cipher, $iv, and $tag for decryption later
$original_plaintext = openssl_decrypt($ciphertext, $cipher, $key, $options=0, $iv, $tag);
echo $original_plaintext."\n";
}
?>
Example #2 PHP 5.6+ 锟斤拷 AES 锟斤拷证锟斤拷锟斤拷锟斤拷锟斤拷
<?php
//$key previously generated safely, ie: openssl_random_pseudo_bytes
$plaintext = "message to be encrypted";
$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");
$iv = openssl_random_pseudo_bytes($ivlen);
$ciphertext_raw = openssl_encrypt($plaintext, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
$hmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);
$ciphertext = base64_encode( $iv.$hmac.$ciphertext_raw );
//decrypt later....
$c = base64_decode($ciphertext);
$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");
$iv = substr($c, 0, $ivlen);
$hmac = substr($c, $ivlen, $sha2len=32);
$ciphertext_raw = substr($c, $ivlen+$sha2len);
$original_plaintext = openssl_decrypt($ciphertext_raw, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
$calcmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);
if (hash_equals($hmac, $calcmac))//PHP 5.6+ timing attack safe comparison
{
echo $original_plaintext."\n";
}
?>