How to use PHP RSA encryption and decryption

When the PHP server interacts with the client and provides an open API, it is often necessary to encrypt the sensitive part of the API data transfer, at which point RSA Asymmetric encryption can be used, and an example to illustrate how to use PHP to encrypt and decrypt data.

1, the first step of encryption and decryption is to generate a public key, a private key pair, the private key encrypted content can be decrypted by the public key (in turn, can also)

Download the open source RSA key generation tool OpenSSL (usually the Linux system comes with the program), unzip to a separate folder, enter the Bin directory, and execute the following command:

openssl genrsa -out rsa_private_key.pem 1024 openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt -out private_key.pem openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pemThe first command generates the original RSA private key file Rsa_private_key.pem, the second command converts the original RSA private key to the PKCS8 format, and the third generates the RSA public key Rsa_public_key.pem
From the above see through the private key can generate the corresponding public key, so we use the private key Private_key.pem on the server side, the public key issued to Android and iOS and other front-end 2, PHP with the generated public key, the private key encrypted decryption, directly on the code <?php $private_key = ‘-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQC3 //sR2tXw0wrC2DySx8vNGlqt3Y7ldU9+LBLI6e1KS5lfc5jl TGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2klBd6h4wrbbHA2XE1sq21ykja/ Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o2n1vP1D+tD3amHsK7QIDAQAB AoGBAKH14bMitESqD4PYwODWmy7rrrvyFPEnJJTECLjvKB7IkrVxVDkp1XiJnGKH 2h5syHQ5qslPSGYJ1M/XkDnGINwaLVHVD3BoKKgKg1bZn7ao5pXT+herqxaVwWs6 ga63yVSIC8jcODxiuvxJnUMQRLaqoF6aUb/2VWc2T5MDmxLhAkEA3pwGpvXgLiWL 3h7QLYZLrLrbFRuRN4CYl4UYaAKokkAvZly04Glle8ycgOc2DzL4eiL4l/+x/gaq deJU/cHLRQJBANOZY0mEoVkwhU4bScSdnfM6usQowYBEwHYYh/OTv1a3SqcCE1f+ qbAclCqeNiHajCcDmgYJ53LfIgyv0wCS54kCQAXaPkaHclRkQlAdqUV5IWYyJ25f oiq+Y8SgCCs73qixrU1YpJy9yKA/meG9smsl4Oh9IOIGI+zUygh9YdSmEq0CQQC2 4G3IP2G3lNDRdZIm5NZ7PfnmyRabxk/UgVUWdk47IwTZHFkdhxKfC8QepUhBsAHL QjifGXY4eJKUBm3FpDGJAkAFwUxYssiJjvrHwnHFbg0rFkvvY63OSmnRxiL4X6EY yI9lblCsyfpl25l7l5zmJrAHn45zAiOoBrWqpM5edu7c ----- END RSA PRIVATE KEY-----‘; $public_key = ‘-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3 //sR2tXw0wrC2DySx8vNGlqt 3Y7ldU9+LBLI6e1KS5lfc5jlTGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2kl Bd6h4wrbbHA2XE1sq21ykja/Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o 2n1vP1D+tD3amHsK7QIDAQAB ----- END PUBLIC KEY-----‘; //echo $private_key; $pi_key = openssl_pkey_get_private( $private_key ); //这个函数可用来判断私钥是否是可用的，可用返回资源id Resource id $pu_key = openssl_pkey_get_public( $public_key ); //这个函数可用来判断公钥是否是可用的 print_r( $pi_key ); echo "\n" ; print_r( $pu_key ); echo "\n" ; $data = "aassssasssddd" ; //原始数据 $encrypted = "" ; $decrypted = "" ; echo "source data:" , $data , "\n" ; echo "private key encrypt:\n" ; openssl_private_encrypt( $data , $encrypted , $pi_key ); //私钥加密 $encrypted = base64_encode ( $encrypted ); //加密后的内容通常含有特殊字符，需要编码转换下，在网络间通过url传输时要注意base64编码是否是url安全的 echo $encrypted , "\n" ; echo "public key decrypt:\n" ; openssl_public_decrypt( base64_decode ( $encrypted ), $decrypted , $pu_key ); //私钥加密的内容通过公钥可用解密出来 echo $decrypted , "\n" ; echo "---------------------------------------\n" ; echo "public key encrypt:\n" ; openssl_public_encrypt( $data , $encrypted , $pu_key ); //公钥加密 $encrypted = base64_encode ( $encrypted ); echo $encrypted , "\n" ; echo "private key decrypt:\n" ; openssl_private_decrypt( base64_decode ( $encrypted ), $decrypted , $pi_key ); //私钥解密

How to use PHP RSA encryption and decryption