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PHP服務端與用戶端互動、提供開放api時,通常需要對敏感的部分api資料轉送進行資料加密,這時候rsa非對稱式加密就能派上用處了,下面通過一個例子來說明如何用php來實現資料的加密解密
1、加密解密的第一步是產生公開金鑰、私密金鑰對,私密金鑰加密的內容能通過公開金鑰解密(反過來亦可以)
下載開源RSA密鑰產生工具openssl(通常Linux系統都內建該程式),解壓縮至獨立的檔案夾,進入其中的bin目錄,執行以下命令:
openssl genrsa -out rsa_private_key.pem 1024
openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outformPEM -nocrypt -out private_key.pem
openssl rsa -in rsa_private_key.pem -pubout -outrsa_public_key.pem
第一條命令產生原始 RSA私密金鑰檔案 rsa_private_key.pem,第二條命令將原始 RSA私密金鑰轉換為pkcs8格式,第三條產生RSA公開金鑰 rsa_public_key.pem
從上面看出通過私密金鑰能產生對應的公開金鑰,因此我們將私密金鑰private_key.pem用在伺服器端,公開金鑰發放給Android跟iOS等前端
2、php中用產生的公開金鑰、私密金鑰進行加密解密,直接上代碼
$private_key = ‘-----BEGIN RSA PRIVATE KEY-----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-----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);//這個函數可用來判斷私密金鑰是否是可用的,可用返回資源idResource id
$pu_key =openssl_pkey_get_public($public_key);//這個函數可用來判斷公開金鑰是否是可用的
print_r($pi_key);echo "\n";
print_r($pu_key);echo "\n";
$data = "aassssasssddd";//未經處理資料
$encrypted = "";
$decrypted = "";
echo "source data:",$data,"\n";
echo "private key encrypt:\n";
openssl_private_encrypt($data,$encrypted,$pi_key);//私密金鑰加密
$encrypted =base64_encode($encrypted);//加密後的內容通常含有特殊字元,需要編碼轉換下,在網路間通過url傳輸時要注意base64編碼是否是url安全的
echo $encrypted,"\n";
echo "public key decrypt:\n";
openssl_public_decrypt(base64_decode($encrypted),$decrypted,$pu_key);//私密金鑰加密的內容通過公開金鑰可用解密出來
echo $decrypted,"\n";
echo "---------------------------------------\n";
echo "public key encrypt:\n";
openssl_public_encrypt($data,$encrypted,$pu_key);//公開金鑰加密
$encrypted = base64_encode($encrypted);
echo $encrypted,"\n";
echo "private key decrypt:\n";
openssl_private_decrypt(base64_decode($encrypted),$decrypted,$pi_key);//私密金鑰解密
echo $decrypted,"\n";
php rsa加密解密執行個體