PHP RSA encryption and decryption instance

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.pem

The 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, we can generate the corresponding public key through the private key, so we use the private key Private_key.pem on the server side, the public key is issued to the Android and iOS and other front

2, PHP with the generated public key, the private key for encryption and decryption, directly on the code

2. $private _key = '-----BEGIN RSA private Key-----
4. Miicxqibaakbgqc3//sr2txw0wrc2dysx8vnglqt3y7ldu9+lbli6e1ks5lfc5jl
6. tgf7kbtskchbm3ouehwqp1zj85ije59af5gib2klbd6h4wrbbha2xe1sq21ykja/
8. Gqx7/iria3zqfxgv/qekygox+xalvoolzqdwh76o2n1vp1d+td3amhsk7qidaqab
10. Aogbakh14bmitesqd4pywodwmy7rrrvyfpenjjtecljvkb7ikrvxvdkp1xijngkh
12. 2h5syhq5qslpsgyj1m/xkdnginwalvhvd3bokkgkg1bzn7ao5pxt+herqxavwws6
14. Ga63yvsic8jcodxiuvxjnumqrlaqof6aub/2vwc2t5mdmxlhakea3pwgpvxgliwl
16. 3h7qlyzlrlrbfrurn4cyl4uyaakokkavzly04glle8ycgoc2dzl4eil4l/+x/gaq
18. deju/chlrqjbanozy0meovkwhu4bscsdnfm6usqowybewhyyh/otv1a3sqcce1f+
20. qbaclcqenihajccdmgyj53lfigyv0wcs54kcqaxapkahclrkqladquv5iwyyj25f
22. Oiq+y8sgccs73qixru1ypjy9yka/meg9smsl4oh9ioigi+zuygh9ydsmeq0cqqc2
24. 4g3ip2g3lndrdzim5nz7pfnmyrabxk/ugvuwdk47iwtzhfkdhxkfc8qepuhbsahl
26. Qjifgxy4ejkubm3fpdgjakafwuxyssijjvrhwnhfbg0rfkvvy63osmnrxil4x6ey
28. yi9lblcsyfpl25l7l5zmjrahn45zaioobrwqpm5edu7c
30. -----END RSA PRIVATE KEY-----';
34. $public _key = '-----BEGIN Public Key-----
36. Migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqc3//sr2txw0wrc2dysx8vnglqt
38. 3y7ldu9+lbli6e1ks5lfc5jltgf7kbtskchbm3ouehwqp1zj85ije59af5gib2kl
40. bd6h4wrbbha2xe1sq21ykja/gqx7/iria3zqfxgv/qekygox+xalvoolzqdwh76o
42. 2n1vp1d+td3amhsk7qidaqab
44. -----END Public KEY-----';

echo $private _key;
$pi _key=openssl_pkey_get_private ($private _key);//This function can be used to determine if the private key is available, and can be used to return the resource ID Resource ID
$pu _key=openssl_pkey_get_public ($public _key);//This function can be used to determine whether the public key is available

Print_r ($pi _key); echo "\ n"; echo "
";
Print_r ($pu _key); echo "\ n"; echo "
";
echo "";

$data = ' php ras encryption algorithm ';
$encrypted = "";
$decrypted = "";

echo "Encrypted source data:". $data. " \ n "; echo "
";
echo "Private key encrypt:\n"; echo "
";
Openssl_private_encrypt ($data, $encrypted, $pi _key);//private key encryption
$encrypted = Base64_encode ($encrypted);//The contents of the encryption usually contain special characters, need to encode the conversion, the transmission between the network through the URL to pay attention to base64 encoding is URL-safe
After the echo ' private key is encrypted: '. $encrypted. ' \ n "; echo "
"; Echo"
";

echo "Public key decrypt:\n"; echo "
";
Openssl_public_decrypt (Base64_decode ($encrypted), $decrypted, $pu _key);//private key encrypted content can be decrypted by public key
echo ' Public key decrypted: '. $decrypted. ' \ n "; echo "
";
echo "";

echo "Public key encrypt:\n"; echo "
";
Openssl_public_encrypt ($data, $encrypted, $pu _key);//Public key encryption
$encrypted = Base64_encode ($encrypted);
echo $encrypted, "\ n"; echo "
";

echo "Private key decrypt:\n"; echo "
";
Openssl_private_decrypt (Base64_decode ($encrypted), $decrypted, $pi _key);//private key decryption
echo $decrypted, "\ n"; echo "
";

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