How to decrypt strings encrypted by Java using DES in PHP?

Detailed explanation of PHP decryption Java DES encryption string

Cross-language data interaction and encryption and decryption are common challenges in development. This article takes Java's DES encryption and PHP decryption as an example to explain in detail how to solve such problems.

Java encryption process

Assume that the Java side uses the key "sg202303" encryption string"> This article participated in the segmentfault interview challenge. You who are reading it are welcome to join. ". The code snippet is as follows:

 final String key = "sg202303";
final String value = "> This article has participated in the segmentfault interview challenge. You who are reading are welcome to join.";
final byte[] encrypt = SecureUtil.des(key.getBytes(StandardCharsets.UTF_8)).encrypt(value);
final String encode = Base64.encode(encrypt);
System.out.println(encode);

The encryption result is:

 <code>p fee0nngtu8ak1e78zggds3ozpa m6h1u8v/fmih/wi1k3ym/q in 3wugtv1xghvibxcrypqofv5ih0bn vztf2fnt4vbh59ertaqoyl 4eprktvf1fngtbcbat3chnayvuixmbsauplwpcgmhjlqm6k4qbzqnendrimczkkyk413alliuy2/fo97pvgdr</code>

PHP decryption process

The PHP side uses the openssl_decrypt function to decrypt Base64 encoded strings. The key and encryption mode must be consistent with the Java side. The code is as follows:

 $encrypted = 'P fEE0NngTu8Ak1E78zGGds3ozPA M6h1u8v/FMih/Wi1k3YM/q In 3wUgTv1XGhViBxCRYpqofV5ih0BN vZTf2fnT4VbH59eRTAQoyl 4ePrKtVf1FngTbcBAT3CHNaYVUIXMbsAUpLwpcgMhJlqM6k4qbzqnEndrIMCzkkyk413alLIUy2/Fo97PvGdR';
$method = 'DES-ECB';
$key = 'sg202303';

$decrypted = openssl_decrypt($encrypted, $method, $key);
var_dump($decrypted);

This code successfully decrypts Java encrypted data, realizing cross-language data secure transmission and processing. It should be noted that the DES encryption algorithm is relatively low in security, and it is recommended to use a more secure encryption algorithm, such as AES in practical applications.

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