Introduction to PHP MCrypt Enable, encrypt, and decrypt methods

$str = "I am Levin"; $key = "123qwe.019860905061x"; $cipher = mcrypt_rijndael_128; $mode = MCRYPT_MODE_ECB; $iv = Mcrypt_create_iv (Mcrypt_get_iv_size ($cipher, $mode), Mcrypt_rand); echo "Original:" $str. " "; $str _encrypt = Mcrypt_encrypt ($cipher, $key, $str, $mode, $IV); echo "Encrypted content is:". $str _encrypt. " "; $str _decrypt = Mcrypt_decrypt ($cipher, $key, $str _encrypt, $mode, $IV); echo "Decrypted content:" $str _decrypt. " "; ?> Copy Code Operation Result: Original: I am Levin encrypted content is: b@ 鴹? = (I argue 蝣 z% decrypted content: I'm Levin. 1), using PHP encryption extension library MCrypt to encrypt and decrypt data, first create an initialization vector, referred to as IV. by $iv = Mcrypt_create_iv (Mcrypt_get_iv_size ($cipher, $modes), mcrypt_rand); the creation of an initialization vector requires two parameters: size Specifies the magnitude of IV; Source is the origin of IV , where the value Mcrypt_rand is the system random number. 2), function mcrypt_get_iv_size ($cipher, $modes) returns the initialization vector size, parameter cipher and mode respectively refer to the algorithm and encryption mode. 3), cryptographic function $str_encrypt = Mcrypt_encrypt ($cipher, $key, $str, $modes, $IV); The 5 parameters of the function are as follows: cipher--encryption algorithm, key--key, Data (str)--required to encrypt, mode--algorithm mode, iv--initialization vector 4), decryption function Mcrypt_decrypt ($cipher, $key, $str _encrypt, $modes, $IV); The function is almost the same as the parameters of the cryptographic function, except that the data is the only one that is $str_encrypt, rather than the raw data $str, which is to be decrypted. The wording in the handbook: Specify the size of the initialization vector IV: $iv _size = mcrypt_get_iv_size (mcrypt_rijndael_256, MCRYPT_MODE_ECB); To create an initialization vector: $iv = Mcrypt_create_iv ($iv _size, Mcrypt_rand); Encrypt password: $key = "123qwe.019860905061x"; Original content (unencrypted): $text = "My name is Adam li!"; Echo $text. " \ n "; After the encrypted content: $crypttext = Mcrypt_encrypt (mcrypt_rijndael_256, $key, $text, MCRYPT_MODE_ECB, $IV); Echo $crypttext. "\ n "; To decrypt something that is already encrypted: $str _decrypt = Mcrypt_decrypt (mcrypt_rijndael_256, $key, $crypttext, MCRYPT_MODE_ECB, $IV); echo $str _decrypt; Original link http://bbs.it-home.org/article/7382.html ?> Copy Code Examples of Add/Decrypt requests: $request _params = Array ( ' Controller ' = ' Todo ', ' Action ' = ' read ', ' Username ' = ' bl ', ' Userpass ' = ' A1 ' ); $private _key = "28e336ac6c9423d946ba02d19c6a2632"; Encrypt request $enc _request = Base64_encode (Mcrypt_encrypt (mcrypt_rijndael_256, $private _key, Json_encode ($request _params), MCrypt _MODE_ECB)); echo "CRYPT:". $enc _request. " "; Decrypt request $params = Json_decode (Trim (Mcrypt_decrypt (mcrypt_rijndael_256, $private _key, Base64_decode ($enc _request), Mcrypt_ MODE_ECB)), true); echo "ENCRYPT: "; Print result Var_dump ($params); ?> Copy Code Note: The parameters in the encryption and decryption functions cipher, key, and mode must correspond to one by one, otherwise the data cannot be restored.

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