PHP uses a custom key to explain how to encrypt and decrypt data

This article mainly introduces PHP using a custom key implementation of data encryption and decryption methods, involving PHP for string conversion, interception and other operations to implement cryptographic decryption function, the need for friends can refer to the following

This example describes how PHP uses a custom key to decrypt data encryption. Share to everyone for your reference, as follows:

When communicating with the client and the server, there is a common scenario that is passed back and forth through an ID as a URL parameter. Assuming that there is only this ID identified in the business, then a slightly more secure communication is required, and the ID is encrypted and transmitted to the server for decryption. This requires a confidential key from the server, which is used to encrypt and decrypt the key.

The decryption method is as follows: $str is a string that needs to be decrypted, $key is a key of its own definition

Cryptographic function Encryptstr ($STR, $key) {  $block = mcrypt_get_block_size (' des ', ' ECB ');  $pad = $block-(strlen ($STR)% $block);  $str. = Str_repeat (Chr ($pad), $pad);  $enc _str = Mcrypt_encrypt (Mcrypt_des, $key, $str, MCRYPT_MODE_ECB);  Return Base64_encode ($enc _str);} Decrypt function Decryptstr ($STR, $key) {  $str = Base64_decode ($STR);  $str = Mcrypt_decrypt (Mcrypt_des, $key, $str, MCRYPT_MODE_ECB);  $block = Mcrypt_get_block_size (' des ', ' ECB ');  $pad = Ord ($str [($len = strlen ($STR))-1]);  Return substr ($str, 0, strlen ($str)-$pad);}

It is worth mentioning that:

If the URL is applied to the ID of this scene, then after the encryption, is the Base64 encoding, it is recommended to urlencode() remove the + number of the effect.

PS: About encryption and decryption of interested friends can also refer to the site online tools:

Text online encryption and decryption tool (includes AES, DES, RC4, etc.):
Http://tools.jb51.net/password/txt_encode

MD5 Online Encryption Tool:
Http://tools.jb51.net/password/CreateMD5Password

Online hashing/hashing algorithm encryption tool:
Http://tools.jb51.net/password/hash_encrypt

Online md5/hash/sha-1/sha-2/sha-256/sha-512/sha-3/ripemd-160 Encryption Tool:
Http://tools.jb51.net/password/hash_md5_sha

Online sha1/sha224/sha256/sha384/sha512 Encryption Tool:
Http://tools.jb51.net/password/sha_encode

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