本文主要向大家介紹了關于PHP語言的RSA加密實例講解，通過具體的內容向大家展示，希望對大家學習php語言有所幫助。

這幾天做了一些接口的對接需要用到RSA加密，百度一番發現原來有個openssl_public_encrypt函數，簡單看了一下，恩，開干。

坑!

1.確認是否開啟ssl

2.解決總是返回false

2.1檢查你的加密字符串是否超過117個字節

2.2檢查公鑰的縮進(這個貌似很嚴格)

2.3還是不行的話請用openssl_pkey_get_public($public_key)查看是否有返回resource ，如果沒有請更換你的php版本。

我在PHP5.5.7是不行，更換到了5.6.25解決了。最后附上一個RSA類(網上找的，用于加密超過117個字節的字符，希望

能幫到你)

----------------------------------------------------華麗分割------------------------------------------------------

if (! function_exists('url_safe_base64_encode')) {

function url_safe_base64_encode ($data) {

return str_replace(array('+','/', '='),array('-','_', ''), base64_encode($data));

}

}

if (! function_exists('url_safe_base64_decode')) {

function url_safe_base64_decode ($data) {

$base_64 = str_replace(array('-','_'),array('+','/'), $data);

return base64_decode($base_64);

}

}

class XRsa

{

const CHAR_SET = "UTF-8";

const BASE_64_FORMAT = "UrlSafeNoPadding";

const RSA_ALGORITHM_KEY_TYPE = OPENSSL_KEYTYPE_RSA;

const RSA_ALGORITHM_SIGN = OPENSSL_ALGO_SHA256;

protected $public_key;

protected $private_key;

protected $key_len;

public function __construct($pub_key, $pri_key = null)

{

$this->public_key = $pub_key;

$this->private_key = $pri_key;

$pub_id = openssl_get_publickey($this->public_key);

$this->key_len = openssl_pkey_get_details($pub_id)['bits'];

}

/*

* 創建密鑰對

*/

public static function createKeys($key_size = 2048)

{

$config = array(

"private_key_bits" => $key_size,

"private_key_type" => self::RSA_ALGORITHM_KEY_TYPE,

);

$res = openssl_pkey_new($config);

openssl_pkey_export($res, $private_key);

$public_key_detail = openssl_pkey_get_details($res);

$public_key = $public_key_detail["key"];

return [

"public_key" => $public_key,

"private_key" => $private_key,

];

}

/*

* 公鑰加密

*/

public function publicEncrypt($data)

{

$encrypted = '';

$part_len = $this->key_len / 8 - 11;

$parts = str_split($data, $part_len);

foreach ($parts as $part) {

$encrypted_temp = '';

openssl_public_encrypt($part, $encrypted_temp, $this->public_key);

$encrypted .= $encrypted_temp;

}

return url_safe_base64_encode($encrypted);

}

/*

* 私鑰解密

*/

public function privateDecrypt($encrypted)

{

$decrypted = "";

$part_len = $this->key_len / 8;

$base64_decoded = url_safe_base64_decode($encrypted);

$parts = str_split($base64_decoded, $part_len);

foreach ($parts as $part) {

$decrypted_temp = '';

openssl_private_decrypt($part, $decrypted_temp,$this->private_key);

$decrypted .= $decrypted_temp;

}

return $decrypted;

}

/*

* 私鑰加密

*/

public function privateEncrypt($data)

{

$encrypted = '';

$part_len = $this->key_len / 8 - 11;

$parts = str_split($data, $part_len);

foreach ($parts as $part) {

$encrypted_temp = '';

openssl_private_encrypt($part, $encrypted_temp, $this->private_key);

$encrypted .= $encrypted_temp;

}

return url_safe_base64_encode($encrypted);

}

/*

* 公鑰解密

*/

public function publicDecrypt($encrypted)

{

$decrypted = "";

$part_len = $this->key_len / 8;

$base64_decoded = url_safe_base64_decode($encrypted);

$parts = str_split($base64_decoded, $part_len);

foreach ($parts as $part) {

$decrypted_temp = '';

openssl_public_decrypt($part, $decrypted_temp,$this->public_key);

$decrypted .= $decrypted_temp;

}

return $decrypted;

}

/*

* 數據加簽

*/

public function sign($data)

{

openssl_sign($data, $sign, $this->private_key, self::RSA_ALGORITHM_SIGN);

return url_safe_base64_encode($sign);

}

/*

* 數據簽名驗證

*/

public function verify($data, $sign)

{

$pub_id = openssl_get_publickey($this->public_key);

$res = openssl_verify($data, url_safe_base64_decode($sign), $pub_id, self::RSA_ALGORITHM_SIGN);

return $res;

}

}

?>

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