关于PHP的RSA加密实例讲解
这几天做了一些接口的对接需要用到RSA加密，百度一番发现原来有个openssl_public_encrypt函数，简单看了一下，恩，开干。
坑!
1.确认是否开启ssl
2.解决总是返回false
2.1检查你的加密字符串是否超过117个字节
2.2检查公钥的缩进(这个貌似很严格)
2.3还是不行的话请用openssl_pkey_get_public($public_key)查看是否有返回resource ，如果没有请更换你的php版本。
我在PHP5.5.7是不行，更换到了5.6.25解决了。最后附上一个RSA类(网上找的，用于加密超过117个字节的字符，希望
能帮到你)
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if (! function_exists('url_safe_base64_encode')) {
function url_safe_base64_encode ($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'];
}
/*
* 创建密钥对
*/
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" => $private_key,
];
}
/*
* 公钥加密
*/
public function publicEncrypt($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);
}
/*
* 私钥解密
*/
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 $decrypted;
}
/*
* 私钥加密
*/
public function privateEncrypt($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);
}
/*
* 公钥解密
*/
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 $decrypted;
}
/*
* 数据加签
*/
public function sign($data)
{
openssl_sign($data, $sign, $this->private_key, self::RSA_ALGORITHM_SIGN);
return url_safe_base64_encode($sign);
}
/*
* 数据签名验证
*/
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;
}
}
?>