Record: Solution to PHP rsa encryption processing failure-PHP Tutorial-php.cn

Record: Solution to PHP rsa encryption processing failure

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Release： 2023-04-10 21:22:02

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About php rsa encryption processing

Recently I just need to connect several interfaces with a third-party system. The other party requires that post data needs rsa encryption, so Baidu searched php about rsa encryption processing, and then you may search for the following example like me:

  /**     
     * @uses 公钥加密     
     * @param string $data     
     * @return null|string     
     */    
    public function publicEncrypt($data = &#39;&#39;) {        
        if (!is_string($data)) {
            return null;        
        }        
        return openssl_public_encrypt($data, $encrypted, $this->_getPublicKey()) ? base64_encode($encrypted) : null;
    }

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So you happily copy it to your own project, slightly modify it, and test it, and simply pass a few strings into it:

<?php
$string = &#39;基督教解决基督教解决决&#39;;
$ret = publicEncrypt($string);
var_dump($ret);
/**     
 * @uses 公钥加密     
 * @param string $data     
 * @return null|string     
 */    
function publicEncrypt($data = &#39;&#39;) {    
    $publicKey = &#39;MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAiX1bIq02AFypLOJ4byShfo6+D6pj0rQrdAtZ8Bb2Z4YwdCZS5vlEduBiVCZSKfF70M0nk4gMqhAKcgwqWxgI1/j8OrX401AssfaiXr2JqsAl679s+Xlwe0jppNe1832+3g0YOawDTpAQsUJDu1DpnyGnUz0qeac0/GiAJlXzKUP+/3db8haDuOkgYrT8A6twGAm7YwIuliieDWDcUS/CQzXGRtwtZQqUJDQsWC1lCML1kRUjbZ2EM2EzyttgHN0SsNryhVLHXSFXpDWbeqQwk36axojGF1lbg/oVQy+BnYJx8pKpTgSwIDAQAB&#39;;    
    $publicKey = "-----BEGIN PUBLIC KEY-----\n" .
    wordwrap($publicKey, 64, "\n", true) .
    "\n-----END PUBLIC KEY-----";
    if (!is_string($data)) {
        return null;        
    }        
    return openssl_public_encrypt($data, $encrypted, $publicKey) ? base64_encode($encrypted) : null;
}

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The program prints:

string(344) "HSqVQbyhmWYrptvgzK+ggqmma88QRFVJerXTrZ+RpYqhZr/Dr9au9wxX+aAYy1wRh0eBk+fIpU4wkEZs6P5yozf5e/rAAEYUOImTJZcOvZqr89znT3yqaV8ME+vR16FLK5sk3BwgpOWI6X+wBwU2cLnHKDdj9RpYWAYhi/mn8XJj4/srKZbSgAjvzWqZI9gfqiJNdz8kf/MPtQ65cSlAhvh4eByY8cLGfgUXV0dxzWAkwTSPl2faSq3GHsNMXnxwoNjIvqz/IuZavqABNVZCwrZC3ZVb+Op7wF9GxrkIdJYzmHpX/wNn1DPLHUvghtO/WmfN4Jb2ZVzTsneB5B3Z6g=="

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Everything seems to be normal. When encrypting a relatively long json string in the actual project, it was found that null was returned. I traced the openssl_public_encrypt function and returned false at this time. , indicating that encryption failed. After passing in strings of different lengths and testing several times, I found that encryption failure will occur when the string length exceeds 100 characters. After referring to the java encryption example sent by the other party, I found that they need to The string to be encrypted undergoes a split operation, so the following modified version is available:

    /**
     * 用公钥加密
     * @param data
     * @param publicKey
     * @return
     * @throws Exception
     */
    public static String rsaEncrypt(String data, PublicKey publicKey) throws Exception {
        Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int inputLen = data.getBytes().length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offset = 0;
        byte[] cache;
        int i = 0;
        // 对数据分段加密
        while (inputLen - offset > 0) {
            if (inputLen - offset > MAX_ENCRYPT_BLOCK) {
                cache = cipher.doFinal(data.getBytes(), offset, MAX_ENCRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(data.getBytes(), offset, inputLen - offset);
            }
            out.write(cache, 0, cache.length);
            i++;
            offset = i * MAX_ENCRYPT_BLOCK;
        }
        byte[] encryptedData = out.toByteArray();
        out.close();
        // 加密后的字符串
        return Base64.getEncoder().encodeToString(encryptedData);
    }

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The current test has not found the encryption failure problem ~ Problem Solving

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