php rsa加密解密实例

<p>php服务端与客户端交互、提供开放api时,通常需要对敏感的部分api数据传输进行数据加密,这时候rsa非对称加密就能派上用处了,下面通过一个例子来说明如何用php来实现数据的加密解密</p><p>1、加密解密的第一步是生成公钥、私钥对,私钥加密的内容能通过公钥解密(反过来亦可以)</p><p>下载开源RSA密钥生成工具openssl(通常Linux系统都自带该程序),解压缩至独立的文件夹,进入其中的bin目录,执行以下命令:</p><pre class="brush:bash;toolbar:false">opensslgenrsa-outrsa_private_key.pem1024 opensslpkcs8-topk8-informPEM-inrsa_private_key.pem-outformPEM-nocrypt-outprivate_key.pem opensslrsa-inrsa_private_key.pem-pubout-outrsa_public_key.pem</pre><p>第一条命令生成原始 RSA私钥文件 rsa_private_key.pem,第二条命令将原始 RSA私钥转换为 pkcs8格式,第三条生成RSA公钥 rsa_public_key.pem</p><p>从上面看出通过私钥能生成对应的公钥,因此我们将私钥private_key.pem用在服务器端,公钥发放给android跟ios等前端</p><p>2、php中用生成的公钥、私钥进行加密解密,直接上代码</p><pre class="brush:php;toolbar:false">&lt;?php $private_key=&#39;-----BEGINRSAPRIVATEKEY----- 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 -----ENDRSAPRIVATEKEY-----&#39;; $public_key=&#39;-----BEGINPUBLICKEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3//sR2tXw0wrC2DySx8vNGlqt 3Y7ldU9+LBLI6e1KS5lfc5jlTGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2kl Bd6h4wrbbHA2XE1sq21ykja/Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o 2n1vP1D+tD3amHsK7QIDAQAB -----ENDPUBLICKEY-----&#39;; //echo$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idResourceid $pu_key=openssl_pkey_get_public($public_key);//这个函数可用来判断公钥是否是可用的 print_r($pi_key);echo&quot;\n&quot;; print_r($pu_key);echo&quot;\n&quot;; $data=&quot;aassssasssddd&quot;;//原始数据 $encrypted=&quot;&quot;; $decrypted=&quot;&quot;; echo&quot;sourcedata:&quot;,$data,&quot;\n&quot;; echo&quot;privatekeyencrypt:\n&quot;; 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$encrypted,&quot;\n&quot;; echo&quot;publickeydecrypt:\n&quot;; openssl_public_decrypt(base64_decode($encrypted),$decrypted,$pu_key);//私钥加密的内容通过公钥可用解密出来 echo$decrypted,&quot;\n&quot;; echo&quot;---------------------------------------\n&quot;; echo&quot;publickeyencrypt:\n&quot;; openssl_public_encrypt($data,$encrypted,$pu_key);//公钥加密 $encrypted=base64_encode($encrypted); echo$encrypted,&quot;\n&quot;; echo&quot;privatekeydecrypt:\n&quot;; openssl_private_decrypt(base64_decode($encrypted),$decrypted,$pi_key);//私钥解密 echo$decrypted,&quot;\n&quot;;</pre>
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