PHP RSA加解密範例

轉自：http://orangeholic.iteye.com/blog/2161771
參考：http://blog.csdn.net/clh604/article/details/20224735
1.產生密鑰和公鑰
開始前需要準備openssl環境
linux 需要安裝openssl工具包，傳送門
http://www.openssl.org/source/
window 下需要安裝openssl的程序，傳送門
http://slproweb.com/products/Win32OpenSSL.html
如果不想安裝，可以用本例提供的金鑰和公鑰進行測試。

密鑰產生
openssl genrsa 用於產生rsa私鑰文件，產生是可以指定私鑰長度和密碼保護，具體參數請參考文件。

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
第一條指令產生原始RSA私鑰檔案rsa_private_key.pem，第二個指令將原始RSA私鑰轉換為pkcs8格式，並輸出檔案名稱為private_key.pem的私密金鑰，第三條依私鑰產生對應的RSA公鑰rsa_public_key.pem
從上面看出透過私鑰能產生對應的公鑰，因此我們將私鑰private_key.pem用在伺服器端，公鑰發放給android跟ios等前端，反過來也可以，注意複製的時候只複製openssl後面的內容即可。

2.PHP用RSA加解密
開始前需要準備php openssl環境，開啟PHP openssl擴展，window將php的設定檔php.ini中的
;extension=php_openssl.dll
改為
extension=php_openssl.dll

程式碼如下:

<code><span><span><?php</span><span>$private_key</span> = <span>'-----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-----'</span>;

<span>$public_key</span> = <span>'-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3//sR2tXw0wrC2DySx8vNGlqt
3Y7ldU9+LBLI6e1KS5lfc5jlTGF7KBTSkCHBM3ouEHWqp1ZJ85iJe59aF5gIB2kl
Bd6h4wrbbHA2XE1sq21ykja/Gqx7/IRia3zQfxGv/qEkyGOx+XALVoOlZqDwh76o
2n1vP1D+tD3amHsK7QIDAQAB
-----END PUBLIC KEY-----'</span>;

<span>//echo $private_key;</span><span>$pi_key</span> =  openssl_pkey_get_private(<span>$private_key</span>);<span>//这个函数可用来判断私钥是否是可用的，可用返回资源id Resource id</span><span>$pu_key</span> = openssl_pkey_get_public(<span>$public_key</span>);<span>//这个函数可用来判断公钥是否是可用的</span>
print_r(<span>$pi_key</span>);<span>echo</span><span>"\n"</span>;
print_r(<span>$pu_key</span>);<span>echo</span><span>"\n"</span>;


<span>$data</span> = <span>"aassssasssddd"</span>;<span>//原始数据</span><span>$encrypted</span> = <span>""</span>; 
<span>$decrypted</span> = <span>""</span>; 

<span>echo</span><span>"source data:"</span>,<span>$data</span>,<span>"\n"</span>;

<span>echo</span><span>"private key encrypt:\n"</span>;

openssl_private_encrypt(<span>$data</span>,<span>$encrypted</span>,<span>$pi_key</span>);<span>//私钥加密</span><span>$encrypted</span> = base64_encode(<span>$encrypted</span>);<span>//加密后的内容通常含有特殊字符，需要编码转换下，在网络间通过url传输时要注意base64编码是否是url安全的</span><span>echo</span><span>$encrypted</span>,<span>"\n"</span>;

<span>echo</span><span>"public key decrypt:\n"</span>;

openssl_public_decrypt(base64_decode(<span>$encrypted</span>),<span>$decrypted</span>,<span>$pu_key</span>);<span>//私钥加密的内容通过公钥可用解密出来</span><span>echo</span><span>$decrypted</span>,<span>"\n"</span>;

<span>echo</span><span>"---------------------------------------\n"</span>;
<span>echo</span><span>"public key encrypt:\n"</span>;

openssl_public_encrypt(<span>$data</span>,<span>$encrypted</span>,<span>$pu_key</span>);<span>//公钥加密</span><span>$encrypted</span> = base64_encode(<span>$encrypted</span>);
<span>echo</span><span>$encrypted</span>,<span>"\n"</span>;

<span>echo</span><span>"private key decrypt:\n"</span>;
openssl_private_decrypt(base64_decode(<span>$encrypted</span>),<span>$decrypted</span>,<span>$pi_key</span>);<span>//私钥解密</span><span>echo</span><span>$decrypted</span>,<span>"\n"</span>;</span></code>

結果：

<code>原数据为<span>:</span>我的帐号是<span>:shiki</span>,密码是<span>:matata</span>
加密成功，加密后数据(base64_encode后)为<span>:X6q/u/hUW4o7z0tETaWuRt3ahvgT9/m+yiqABDDs9ccHRekB0YU9UAv5zA/VZawLoDVhiyl9bAc3WHeRIexz+gybUJKkI69RFkWHL5n3llfCeTdnSXIQ4Aa+ysfmCicxXwMeP2vUWZBcxJiRVLiGGe1shJjw/TxvmocOlaFRVnQ=</span>
解密成功，解密后数据为<span>:</span>我的帐号是<span>:shiki</span>,密码是<span>:matata</span></code>

以上就介紹了PHP RSA加解密範例，包含了方面的內容，希望對PHP教學有興趣的朋友有幫助。