PHP使用openssl进行Rsa加密，如果要加密的明文太长则会出错，解决方法：加密的时候117个字符加密一次，然后把所有的密文拼接成一个密文；解密的时候需要128个字符解密一下，然后拼接成数据。
加密：
/**
* 加密
* @param $originalData
* @return string|void
*/
/*function encrypt($originalData){ // if (openssl_private_encrypt($originalData, $encryptData, $this->rsaPrivateKey)) {
if (openssl_public_encrypt($originalData, $encryptData, $this->rsaPublicKey)) {
return base64_encode($encryptData);
} else {
return false;
}
}*/
function encrypt($originalData){ $crypto = ''; foreach (str_split($originalData, 117) as $chunk) { openssl_public_encrypt($chunk, $encryptData, $this->rsaPublicKey); $crypto .= $encryptData;
} return base64_encode($crypto);
}
解密：
/**
* 私钥解密
* @param $encryptData
*/ /*function decrypt($encryptData){ // if (openssl_public_decrypt(base64_decode($encryptData), $decryptData, $this->rsaPublicKey)) {
if (openssl_private_decrypt(base64_decode($encryptData), $decryptData, $this->rsaPrivateKey)) { return $decryptData; } else { return false;
}
}*/
function decrypt($encryptData){ $crypto = ''; foreach (str_split(base64_decode($encryptData), 128) as $chunk) { openssl_private_decrypt($chunk, $decryptData, $this->rsaPrivateKey); $crypto .= $decryptData;
} return $crypto;
}
DES 加密解密：
function encrypt($encrypt,$key){
$passcrypt = mcrypt_encrypt(MCRYPT_DES ,$key, $encrypt, MCRYPT_MODE_CBC, $key);
$encode = base64_encode($passcrypt);
return $encode;
}
function decrypt($decrypt,$key){
$decoded = base64_decode($decrypt);
$decrypted = mcrypt_decrypt(MCRYPT_DES ,$key, $decoded, MCRYPT_MODE_ECB, $key);
return $decrypted;
}
AES 加密解密
//为 CBC 模式创建随机的初始向量
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC); $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); function aesEncrypt($encrypt, $key, $iv){ $passcrypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_128 ,$key, $encrypt, MCRYPT_MODE_CBC, $iv); //将初始向量附加在密文之后，以供解密时使用
$passcrypt = $iv . $passcrypt; //对密文进行 base64 编码
$encode = base64_encode($passcrypt); return $encode; } function aesDecrypt($decrypt, $key, $iv_size){ $decoded = base64_decode($decrypt); //初始向量大小，可以通过 mcrypt_get_iv_size() 来获得
$iv_dec = substr($decoded, 0, $iv_size); //获取除初始向量外的密文
$decoded = substr($decoded, $iv_size); //可能需要从明文末尾移除 0
$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128 , $key, $decoded, MCRYPT_MODE_ECB, $iv_dec); return $decrypted;
}