openssl_pkey_new
When used with RSA, this function only accepts a single block. Block size is equal to the RSA key size - i. e., with a 1024-bit key, block size should be 128 bytes. Depending on the padding scheme, the payload may be even smaller. The padding is removed, so you'll receive the ready to use plaintext. Blocking logic is up to the caller, though.
When passing Microsoft CryptoAPI-generated RSA cyphertext, revert the bytes in the block (you may use strrev()).
openssl_private_decrypt
(PHP 4 >= 4.0.6, PHP 5)
openssl_private_decrypt — 秘密鍵でデータを復号する
説明
bool openssl_private_decrypt
( string $data
, string &$decrypted
, mixed $key
[, int $padding = OPENSSL_PKCS1_PADDING
] )
openssl_private_decrypt() は、事前に openssl_public_encrypt() で暗号化された data を復号し、それを decrypted に格納します。
これを使用するのは、例えばあなたにのみ送られてきたデータを復号する場合です。
パラメータ
- data
-
- decrypted
-
- key
-
key は、 データの暗号化に使用したものに対応する秘密鍵である必要があります。
- padding
-
padding のデフォルトは OPENSSL_PKCS1_PADDING ですが、 これ以外にも OPENSSL_SSLV23_PADDING、 OPENSSL_PKCS1_OAEP_PADDING、 OPENSSL_NO_PADDING が指定可能です。
返り値
成功した場合に TRUE を、失敗した場合に FALSE を返します。
add a note
User Contributed Notesopenssl_private_decrypt
sevaa at sprynet dot com
03-Oct-2009 02:08
03-Oct-2009 02:08
wfredkNOSPAM at L5DevelopmentNOSPAM dot com
08-Mar-2002 11:58
08-Mar-2002 11:58
Encrypt using public key, decrypt using private key.
Use this to store stuff in your database: Unless someone
has your private key, the database contents are useless.
Also, use this for sending to a specific individual: Get
their public key, encrypt the message, only they can use
their private key to decode it.
<?php
echo "Source: $source";
$fp=fopen("/path/to/certificate.crt","r");
$pub_key=fread($fp,8192);
fclose($fp);
openssl_get_publickey($pub_key);
/*
* NOTE: Here you use the $pub_key value (converted, I guess)
*/
openssl_public_encrypt($source,$crypttext,$pub_key);
echo "String crypted: $crypttext";
$fp=fopen("/path/to/private.key","r");
$priv_key=fread($fp,8192);
fclose($fp);
// $passphrase is required if your key is encoded (suggested)
$res = openssl_get_privatekey($priv_key,$passphrase);
/*
* NOTE: Here you use the returned resource value
*/
openssl_private_decrypt($crypttext,$newsource,$res);
echo "String decrypt : $newsource";
?>