PHP RSA encryption and decryption instance

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.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

<?PHP$private _key=-----BEGIN RSA PRIVATE KEY-----miicxqibaakbgqc3//sr2txw0wrc2dysx8vnglqt3y7ldu9+ lbli6e1ks5lfc5jltgf7kbtskchbm3ouehwqp1zj85ije59af5gib2klbd6h4wrbbha2xe1sq21ykja/gqx7/iria3zqfxgv/qekygox+ Xalvoolzqdwh76o2n1vp1d+ td3amhsk7qidaqabaogbakh14bmitesqd4pywodwmy7rrrvyfpenjjtecljvkb7ikrvxvdkp1xijngkh2h5syhq5qslpsgyj1m/ xkdnginwalvhvd3bokkgkg1bzn7ao5pxt+herqxavwws6ga63yvsic8jcodxiuvxjnumqrlaqof6aub/ 2vwc2t5mdmxlhakea3pwgpvxgliwl3h7qlyzlrlrbfrurn4cyl4uyaakokkavzly04glle8ycgoc2dzl4eil4l/+x/gaqdeju/ chlrqjbanozy0meovkwhu4bscsdnfm6usqowybewhyyh/otv1a3sqcce1f+ qbaclcqenihajccdmgyj53lfigyv0wcs54kcqaxapkahclrkqladquv5iwyyj25foiq+y8sgccs73qixru1ypjy9yka/meg9smsl4oh9ioigi+ zuygh9ydsmeq0cqqc24g3ip2g3lndrdzim5nz7pfnmyrabxk/ Ugvuwdk47iwtzhfkdhxkfc8qepuhbsahlqjifgxy4ejkubm3fpdgjakafwuxyssijjvrhwnhfbg0rfkvvy63osmnrxil4x6eyyi9lblcsyfpl25l7l5zmjrah n45zaioobrwqpm5edu7c-----END RSA PRIVATE KEY-----‘;$public _key=-----BEGIN Public KEY-----migfma0gcsqgsib3dqebaquaa4gnadcbiqkbgqc3//sr2txw0wrc2dysx8vnglqt3y7ldu9+ lbli6e1ks5lfc5jltgf7kbtskchbm3ouehwqp1zj85ije59af5gib2klbd6h4wrbbha2xe1sq21ykja/gqx7/iria3zqfxgv/qekygox+ Xalvoolzqdwh76o2n1vp1d+td3amhsk7qidaqab-----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 ($public _key);//This function can be used to determine if the public key is availablePrint_r($pi _key);Echo"\ n";Print_r($pu _key);Echo"\ n";$data= "AASSSSASSSDDD";//Raw Data$encrypted= ""; $decrypted= ""; Echo"Source data:",$data, "\ n";Echo"Private Key encrypt:\n"; Openssl_private_encrypt ($data,$encrypted,$pi _key);//private key Encryption$encrypted=Base64_encode($encrypted);//The encrypted content usually contains special characters that need to be encoded for conversion and to be aware that the Base64 encoding is URL-safe when transmitted over a network through a URL.Echo $encrypted, "\ n";Echo"Public Key decrypt:\n"; Openssl_public_decrypt (Base64_decode($encrypted),$decrypted,$pu _key);//the contents of the private key encryption can be decrypted by the public key//This step is in doubt with Base64_decode ()???Echo $decrypted, "\ n";Echo"---------------------------------------\ n";Echo"Public Key encrypt:\n"; Openssl_public_encrypt ($data,$encrypted,$pu _key);//Public Key Cryptography$encrypted=Base64_encode($encrypted);Echo $encrypted, "\ n";Echo"Private Key decrypt:\n"; Openssl_private_decrypt (Base64_decode($encrypted),$decrypted,$pi _key);//private Key DecryptionEcho $decrypted, "\ n";

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PHP RSA encryption and decryption instance