php rsa encryption and decryption,
[helpful for WeChat payment v3 encryption, decryption, signature, and signature verification ]
//res performs private key encryption, remember that all secret keys must be left-aligned, and the right is the Enter key
function Rsacheck($data){
$PRIVATEkey="-----BEGIN PRIVATE KEY-----
MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDRCtcvAda7ieyk
U3RUj+wYGWfyxcJ8043afywnYjj9+S0TJCPI65l7SvCr6q8s3Epsisxt2r/j5chB
x8YEwj/w0xUf8Gnuuz5puJpPAgIOwJcjyA+mvXa1YrS/PuvqlMtTxH0q+CoJjQs1
+3vdRr07dKSvc1s0A4n/EDwe3vAr2wc7vAfGAzRdZpSFnLRrGuCuydjcc2aQ2fQd
w1Lpl2vi8RP5q/KVlDuQ4WfW7gSG9hRjA6+gOVr93G+iNRalr1qO9imy6dU/WDlM
jKELoOENEYUMQCDc711iDg77Fpo1rSZHqSYvKXLMb8eMrG1T55sQQtSm+kMxqb34
rLSjPxPzAgMBAAECggEBAJ8rHu+2+bbwbRQuSzx8Hau35JNRCyaaur8s6ATQ4E5Z
pX2WnfzFj6b2R8zPNDT3Q1/kS4Y18rhnZRTZNSi4c5E+WC5qk25oejxriGsyPzjW
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Kq8aUe7+tBdPA8BI9bO4HHIbP63KWZKKeyByEvpDWEkCgYEA79muQpRreJ7WSJrZ
SrtQkmLCPHEsNQrRH4bF73U6rZ5k6s6MJ6BDNOJlWGS496LOmYihs4Bz14uXHvCt
Z+GGNJKhrMrkMFDxsax4yFabF61nJukRjpwC3jukrE2n9hK+Pa6ETM74+tFiEgH9
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XBlHDm34QU0CgYBUXmDy4JxxQIYl4fpfVEaCR6UFd9XSDq0DBvhnQ/hRDC95fRBF
/BTH7H8zubJqwWUlEq+2oY+eGWceJhEJQoZfxdiDHJdp+38ZPY77AaPqjz+Cq2dW
n8BOhfJl/acAYxVyQwocro1cRPzXUsYJrtgmUef96qpm8FqcGjrPRI1RJwKBgQCZ
LvHUU4MH4tEyX16FmmtHX5z9R8UpG469zzvI89/UPan0IpaJozkcKQlje0/gFDvo
ewppkHwhsaPAdJvl8jtR9WiNh60k+wYx9+PB9Z7tCr3mvJL+4RD6iaXDB3NSLw5B
iSlVbHZ4W2/Tr4z548VwdVDsxYAWnP45gTVSx9ew5QKBgQCq60Ym/8QPDBf1dibF
KDmpblAitO+IqCZ21wih6vDT2G0V9vYYNPS679CaSlYKDgm5sD1+XCI/ceaUE/UM
tqsjYVdHHbXjQz2ScLmO599R5SbTUQ3nOUYVVvyPqhpLiuUYUoZycGNoI5UwwWJ7
4ijzU25Oyk/EhatM9zZZyJ3yGw==
-----END PRIVATE KEY-----";
$data="ceshi";
//必须通过openssl的方法进行读取rsa的私钥否则如果直接用私钥进行加密的话会会出现乱
$res=openssl_get_privatekey($PRIVATEkey);
//ras使用私钥进行加密，第一个是需要加密的参数，第二个是一个空参数【存放结果】，第三个是私钥
$res=openssl_private_encrypt($data,$decrypt,$res);
//经过上面的加密后还是需要最后一步进行base64_encode的加密，encode是加密，decode是解密
$sign=base64_encode($decrypt);
var_dump($sign);die;
}
//rsa public key decryption ----- keep the public key properly
function check2($data){
$publickey="-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0QrXLwHWu4nspFN0VI/s
GBln8sXCfNON2n8sJ2I4/fktEyQjyOuZe0rwq+qvLNxKbIrMbdq/4+XIQcfGBMI/
8NMVH/Bp7rs+abiaTwICDsCXI8gPpr12tWK0vz7r6pTLU8R9KvgqCY0LNft73Ua9
O3Skr3NbNAOJ/xA8Ht7wK9sHO7wHxgM0XWaUhZy0axrgrsnY3HNmkNn0HcNS6Zdr
4vET+avylZQ7kOFn1u4EhvYUYwOvoDla/dxvojUWpa9ajvYpsunVP1g5TIyhC6Dh
DRGFDEAg3O9dYg4O+xaaNa0mR6kmLylyzG/HjKxtU+ebEELUpvpDMam9+Ky0oz8T
8wIDAQAB
-----END PUBLIC KEY-----"
$data1="加密完内容";
//拿到已经加密的密文，首先进行base64_decode的解密
$data=base64_decode($data1);
//对经过base64_decode解密的密文，进行rsa公钥解密，跟加密的时候参数位置一样
$res=openssl_public_decrypt($data,$decrypt,$publickey);
var_dump($decrypt);die;
}
//ras for private key signing
//The following uses rsa to sign and call the open_sign method to sign. Note: this is a signature, not an encryption. The signed ciphertext and encrypted ciphertext are different, remember!
function check3($data){
$PRIVATEkey="-----BEGIN PRIVATE KEY-----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XBlHDm34QU0CgYBUXmDy4JxxQIYl4fpfVEaCR6UFd9XSDq0DBvhnQ/hRDC95fRBF
/BTH7H8zubJqwWUlEq+2oY+eGWceJhEJQoZfxdiDHJdp+38ZPY77AaPqjz+Cq2dW
n8BOhfJl/acAYxVyQwocro1cRPzXUsYJrtgmUef96qpm8FqcGjrPRI1RJwKBgQCZ
LvHUU4MH4tEyX16FmmtHX5z9R8UpG469zzvI89/UPan0IpaJozkcKQlje0/gFDvo
ewppkHwhsaPAdJvl8jtR9WiNh60k+wYx9+PB9Z7tCr3mvJL+4RD6iaXDB3NSLw5B
iSlVbHZ4W2/Tr4z548VwdVDsxYAWnP45gTVSx9ew5QKBgQCq60Ym/8QPDBf1dibF
KDmpblAitO+IqCZ21wih6vDT2G0V9vYYNPS679CaSlYKDgm5sD1+XCI/ceaUE/UM
tqsjYVdHHbXjQz2ScLmO599R5SbTUQ3nOUYVVvyPqhpLiuUYUoZycGNoI5UwwWJ7
4ijzU25Oyk/EhatM9zZZyJ3yGw==
-----END PRIVATE KEY-----";
$data="ceshi";
//必须通过openssl的方法进行读取rsa的私钥否则如果直接用私钥进行加密的话会会出现乱
$res=openssl_get_privatekey($PRIVATEkey);
//ras使用私钥进行加密，第一个是需要加密的参数，第二个是一个空参数【存放结果】，第三个是私钥，这里出现了第四个参数，OPENSSL_ALGO_MD5，这个是MD5实现的是MD5withRSA签名的算法
openssl_sign($data,$sign,$res,OPENSSL_ALGO_MD5);
//经过上面的加密后还是需要最后一步进行base64_encode的加密，encode是加密，decode是解密
$sign=base64_encode($sign);
var_dump($sign);die;
}
//RSA public key for signature verification
function check4($data){
$publickey="-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0QrXLwHWu4nspFN0VI/s
GBln8sXCfNON2n8sJ2I4/fktEyQjyOuZe0rwq+qvLNxKbIrMbdq/4+XIQcfGBMI/
8NMVH/Bp7rs+abiaTwICDsCXI8gPpr12tWK0vz7r6pTLU8R9KvgqCY0LNft73Ua9
O3Skr3NbNAOJ/xA8Ht7wK9sHO7wHxgM0XWaUhZy0axrgrsnY3HNmkNn0HcNS6Zdr
4vET+avylZQ7kOFn1u4EhvYUYwOvoDla/dxvojUWpa9ajvYpsunVP1g5TIyhC6Dh
DRGFDEAg3O9dYg4O+xaaNa0mR6kmLylyzG/HjKxtU+ebEELUpvpDMam9+Ky0oz8T
8wIDAQAB
-----END PUBLIC KEY-----"
$data1="ceshi";
$sign="**************签名********************"
//必须调用openssl的方式获得公钥，否则不行
$res=openssl_get_publickey($publickey);
//$data是签名参数，$sign是需要验签的签名，先对签名进行base64_decode解密，然后对签名密文进行MD5withRSA进行验签，验签是调用openssl内置方法验签，返回bool值
$result=(bool)openssl_verify($data,base64_decode($sign),$res,OPENSSL_ALGO_MD5);
var_dump($result);die;
}