对称加密算法查询，显示当前环境下所有支持的算法列表。
print_r(openssl_get_cipher_methods());
php8.1.11 的加密算法
[0] => aes-128-cbc
[1] => aes-128-cbc-hmac-sha1
[2] => aes-128-cbc-hmac-sha256
[3] => aes-128-ccm
[4] => aes-128-cfb
[5] => aes-128-cfb1
[6] => aes-128-cfb8
[7] => aes-128-ctr
[8] => aes-128-ecb
[9] => aes-128-gcm
[10] => aes-128-ocb
[11] => aes-128-ofb
[12] => aes-128-xts
[13] => aes-192-cbc
[14] => aes-192-ccm
[15] => aes-192-cfb
[16] => aes-192-cfb1
[17] => aes-192-cfb8
[18] => aes-192-ctr
[19] => aes-192-ecb
[20] => aes-192-gcm
[21] => aes-192-ocb
[22] => aes-192-ofb
[23] => aes-256-cbc
[24] => aes-256-cbc-hmac-sha1
[25] => aes-256-cbc-hmac-sha256
[26] => aes-256-ccm
[27] => aes-256-cfb
[28] => aes-256-cfb1
[29] => aes-256-cfb8
[30] => aes-256-ctr
[31] => aes-256-ecb
[32] => aes-256-gcm
[33] => aes-256-ocb
[34] => aes-256-ofb
[35] => aes-256-xts
[36] => aria-128-cbc
[37] => aria-128-ccm
[38] => aria-128-cfb
[39] => aria-128-cfb1
[40] => aria-128-cfb8
[41] => aria-128-ctr
[42] => aria-128-ecb
[43] => aria-128-gcm
[44] => aria-128-ofb
[45] => aria-192-cbc
[46] => aria-192-ccm
[47] => aria-192-cfb
[48] => aria-192-cfb1
[49] => aria-192-cfb8
[50] => aria-192-ctr
[51] => aria-192-ecb
[52] => aria-192-gcm
[53] => aria-192-ofb
[54] => aria-256-cbc
[55] => aria-256-ccm
[56] => aria-256-cfb
[57] => aria-256-cfb1
[58] => aria-256-cfb8
[59] => aria-256-ctr
[60] => aria-256-ecb
[61] => aria-256-gcm
[62] => aria-256-ofb
[63] => bf-cbc
[64] => bf-cfb
[65] => bf-ecb
[66] => bf-ofb
[67] => camellia-128-cbc
[68] => camellia-128-cfb
[69] => camellia-128-cfb1
[70] => camellia-128-cfb8
[71] => camellia-128-ctr
[72] => camellia-128-ecb
[73] => camellia-128-ofb
[74] => camellia-192-cbc
[75] => camellia-192-cfb
[76] => camellia-192-cfb1
[77] => camellia-192-cfb8
[78] => camellia-192-ctr
[79] => camellia-192-ecb
[80] => camellia-192-ofb
[81] => camellia-256-cbc
[82] => camellia-256-cfb
[83] => camellia-256-cfb1
[84] => camellia-256-cfb8
[85] => camellia-256-ctr
[86] => camellia-256-ecb
[87] => camellia-256-ofb
[88] => cast5-cbc
[89] => cast5-cfb
[90] => cast5-ecb
[91] => cast5-ofb
[92] => chacha20
[93] => chacha20-poly1305
[94] => des-cbc
[95] => des-cfb
[96] => des-cfb1
[97] => des-cfb8
[98] => des-ecb
[99] => des-ede
[100] => des-ede-cbc
[101] => des-ede-cfb
[102] => des-ede-ofb
[103] => des-ede3
[104] => des-ede3-cbc
[105] => des-ede3-cfb
[106] => des-ede3-cfb1
[107] => des-ede3-cfb8
[108] => des-ede3-ofb
[109] => des-ofb
[110] => desx-cbc
[111] => id-aes128-CCM
[112] => id-aes128-GCM
[113] => id-aes128-wrap
[114] => id-aes128-wrap-pad
[115] => id-aes192-CCM
[116] => id-aes192-GCM
[117] => id-aes192-wrap
[118] => id-aes192-wrap-pad
[119] => id-aes256-CCM
[120] => id-aes256-GCM
[121] => id-aes256-wrap
[122] => id-aes256-wrap-pad
[123] => id-smime-alg-CMS3DESwrap
[124] => rc2-40-cbc
[125] => rc2-64-cbc
[126] => rc2-cbc
[127] => rc2-cfb
[128] => rc2-ecb
[129] => rc2-ofb
[130] => rc4
[131] => rc4-40
[132] => rc4-hmac-md5
[133] => seed-cbc
[134] => seed-cfb
[135] => seed-ecb
[136] => seed-ofb
[137] => sm4-cbc
[138] => sm4-cfb
[139] => sm4-ctr
[140] => sm4-ecb
[141] => sm4-ofb
获取当前算法需要的 iv 长度
openssl_cipher_iv_length()
生成一个随机的符合算法长度的 iv 内容
openssl_random_pseudo_bytes()
加密
openssl_encrypt($data, $method, $key, $options, $iv);
$data 是需要加密的字符串
$method 是加密算法（php 8.1.25中 使用DES-CBC方式 返回false ）
$key 是加密的密钥
$options 有两个可选常量：OPENSSL_RAW_DATA 和 OPENSSL_ZERO_PADDING
OPENSSL_RAW_DATA：加密后的数据将按照原样返回（二进制乱码内容）
OPENSSL_ZERO_PADDING ：加密后的数据将返回为 base64 之后的内容(经过测试，php8.1.11版本不支持该选项，php7.1.33版本支持该选项)
$iv:向量
openssl_encrypt函数默认使用的是PKCS7填充（不是PKCS5填充）。PKCS7填充实际上是PKCS5填充的扩展，用于对不同块大小的数据进行填充。
解密
openssl_decrypt($data, $method, $key, $options, $iv);
des加密的pkcs5和base64方法
// 填充函数，用于满足 DES 算法的块大小要求
function pkcs5Pad($data, $blockSize) {
$padding = $blockSize - (strlen($data) % $blockSize);
$paddingChar = chr($padding);
$paddedData = $data . str_repeat($paddingChar, $padding);
return $paddedData;
}
// 去除填充函数
function pkcs5Unpad($data) {
$paddingChar = ord($data[strlen($data) - 1]);
$unpaddedData = substr($data, 0, -$paddingChar);
return $unpaddedData;
}
//url base64编码
function urlsafe_b64encode($string) {
$data = base64_encode($string);
$data = str_replace(array('+','/','='),array('-','_',''),$data);
return $data;
}
//url base64解码
function urlsafe_b64decode($string) {
$data = str_replace(array('-','_'),array('+','/'),$string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
return base64_decode($data);
}
php8.1.11中的完整DES-CBC加密解密
//url base64编码
function urlsafe_b64encode($string) {
$data = base64_encode($string);
$data = str_replace(array('+','/','='),array('-','_',''),$data);
return $data;
}
//url base64解码
function urlsafe_b64decode($string) {
$data = str_replace(array('-','_'),array('+','/'),$string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
return base64_decode($data);
}
//加密
public function encrypt($info){
$encryptMethod = "DES-CBC";
$data = openssl_encrypt($info, $encryptMethod, $this->key, OPENSSL_RAW_DATA,$this->iv);
$data = base64_encode($data);
return $data;
}
// 解密
public function decrypt($info){
$encryptMethod = "DES-CBC";
$info = $this->urlsafe_b64decode($info);
$decrypted = openssl_decrypt($info, $encryptMethod, $this->key, OPENSSL_RAW_DATA,$this->iv);
return $decrypted;
}
