一個很好的例子在php中使用RSA

我已經生成公鑰和私鑰與

ssh-keygen -t rsa

而現在我想使用那些從我的PHP代碼。下面是我使用的代碼：

<?php 
$string=$_GET["i"]; 
//$fp=fopen ("public.pem","r"); 
$pub_key='ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAtTLDrnS+MyPb/MGHzgcS90DgaoPiDNattlL0Xo7keAjfqz5/yCXU0L8ilkAWIwME5DdXK04MskRtupYPwxPGB4Y7bG/4wvArx5FEgDSq6FUMNvQZ/Vqj13uvcjadLctC2ypAUPRo39qO1IGLEDEWNOS49UgLxzfnr1dZF/Ox5m5UjhOjsALcTiv4eR6ClGcCrAHE7Jp5nL2BwVu46nx3eFlpe7cljQVUOQDgUa5yWaRoJE6qcYgQu1TDo6b/pcAWU1WVu+HzJY4g0aoV2VqamCnl3oyWoPz7ykvxbJbHv7/qTbV+IBNzSx4R7KSppvnPKsrbeiWROvZ4JF84leX+Iw== [email protected]'; 

//fclose($fp); 
$PK=""; 
$PK=openssl_get_publickey($pub_key); 
if (!$PK) { 
    echo "Cannot get public key"; 
    echo $pub_key; 
} 
$finaltext=""; 
openssl_public_encrypt($string,$finaltext,$PK); 
if (!empty($finaltext)) { 
    openssl_free_key($PK); 
    echo "Encryption OK!"; 
    echo $finaltext; 
    echo "<br/><br/><br/>"; 
}else{ 
    echo "Cannot Encrypt"; 
} 

// STEP 2: Decription (Using Private Key) 

//$fp=fopen ("private.pem","r"); 
$priv_key2='-----BEGIN RSA PRIVATE KEY----- 
MIIEoAIBAAKCAQEAtTLDrnS+MyPb/MGHzgcS90DgaoPiDNattlL0Xo7keAjfqz5/ 
yCXU0L8ilkAWIwME5DdXK04MskRtupYPwxPGB4Y7bG/4wvArx5FEgDSq6FUMNvQZ 
/Vqj13uvcjadLctC2ypAUPRo39qO1IGLEDEWNOS49UgLxzfnr1dZF/Ox5m5UjhOj 
sALcTiv4eR6ClGcCrAHE7Jp5nL2BwVu46nx3eFlpe7cljQVUOQDgUa5yWaRoJE6q 
cYgQu1TDo6b/pcAWU1WVu+HzJY4g0aoV2VqamCnl3oyWoPz7ykvxbJbHv7/qTbV+ 
IBNzSx4R7KSppvnPKsrbeiWROvZ4JF84leX+IwIBIwKCAQAparBiY9Oz6vB0SX4g 
dqU/1FCNX/kngYbKlp5Bf78xYR0udK9+NIhqOlEMZmt1t4wW6BPspCAovy8GE6vU 
0VHV1Yns5mS+189+EpNQgREfKWHgrNK9kQ+Btd71iNN4LnWucA6zaxCoMfTC28gD 
s3LKQuhylB/zBXbI/gW8VPV2fzvFd35iA6QqNKWbjkaRd2y0TOv+RAcnCrYFwV5O 
LscgjUNS2Hk8dlyXoneB8SqxiFzrXgSTihUelsoPQCj7mZLZ87UFF6sLU85gxoNT 
tw0VoKD3Ve4poDEkWH28v39MCA/ZOPtNu68oimgVxRWyswvr2X9UvQ8joy2QaQZs 
0mRLAoGBAN+dc6J8BgzmCr1yUQejU9nPAIFseH0Y+Jd/kHMV0CcSTnJwEak+6H5x 
aTVQVNVMxdBd3xLG6GLYUWz01ptj3ubkO3qisqeVWvXhp7thHBaj640jV33jUY8p 
eSrYVqPTDXGb+Jq56Tu0y+9sZeqXJBDeu2vLi7wlK2iAjQ9GHHYdAoGBAM9wtThH 
LOEveuZ+PwY0qK1IMLsHuF049g3onUk+n6k3oPCBMmnllwCwMOAo2oJEKgFAtEOl 
I5F9L6KsF7D1IUz1j+Mi578+pIQIndvp/aq1n5iBHSbHjpWhz6B6elcADzNbY5fy 
FRlE9JshAIAiBmokN+Kb3rLZ4ShMBq0zsRE/AoGAOYBCTlpn9LAupb5PWbxIwvq2 
/LV+EYoUCbMWg/5Ld8Lg+Nr9OiYehun2e2xtle8rjVn3iHxKYo9lZSkD/BJd45nG 
JtlhI8dR53SKN39e/oHsHPp1lWZWzQqqIPXNIs/e4rMUCoeTvuVZAw0+x0tvrJEL 
n2A53+xM/Z1mGd7UHl8CgYARx9UE0uaW9XDvL2R83/EzbJZ2bmBCgTmpa7W10irx 
P0hPIQRSOEAkoWNGaebX9zbM6En3K2ly3tgyg8eEMkSu0zg4Ck5g2XvQzYnfpleS 
ShT+cXeG+yl6ijZeNmJB+LDYhC0bpwkfbE97AtQoPW5DnLRVQI9uanJiiix1PvHr 
iQKBgBj/RiXsDHvVJ28xZPUffZntrAD/TWXMHZWVMFgfsf8Ti0O7ypXqY43+Aoph 
nfDH6xJFqU9azsiv5xQVY7X1h4+DuOamqdawIV5LtYod+ip0dxduQMfrqLld/p0m 
E+jAaxvC4b6zqomFnZ9MB9eAzUg9i8UQkc4H3cH/bO6MKPG3 
-----END RSA PRIVATE KEY----- 
';//fread ($fp,8192); 
//fclose($fp); 
$PK2=openssl_get_privatekey($priv_key2); 
$Crypted=openssl_private_decrypt($Data,$Decrypted,$PK2); 
if (!$Crypted) { 
    $MSG.="<p class='error'>Cannot Decrypt ($CCID).</p>"; 
}else{ 
    echo "Decrypted Data: " . $Decrypted; 
}

最後，應用程序崩潰與：

Cannot get public key 
Warning: openssl_public_encrypt() [function.openssl-public-encrypt]: key parameter is not a valid public key in /home/menkaur/public_html/iathao.com/bookmarks/lcn.php on line 13 
Cannot Encrypt

我究竟做錯了什麼？

來源

2011-10-27 Arsen Zahray

openssl使用的關鍵是PEM格式。要生成它，請使用以下代碼：

openssl genrsa -des3 -out private.pem 1024

它將生成一個名爲「private.pem」的文件。然後你就可以使用生成的公鑰：

openssl rsa -in private.pem -out public.pem -outform PEM -pubout

在PHP如下，你可以使用這些鍵：

<?php 

    $pub = file_get_contents('public.pem'); 
    $pk = openssl_get_publickey($pub); 
    if(!$pk) ...

然後用你的邏輯做任何你想要的。

來源

2011-10-27 17:57:54

回答

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