php邮件加密,怎样对邮件正文分段加密及解密解决思路

PHP code$mailcont = "邮件正文………超过1024字节………邮件正文";

$crtpath = "/usr/nc-home/webpost/mailbox/d00/1/y/u/yushuai.niu/.user/certkey/wxd.crt";

exec("chmod 777 {$crtpath}");

$fp = fopen($crtpath, "r");

$crt = fread($fp, 8192);

fclose($fp);

$pubKey = openssl_get_publickey($crt);

//从证书中解析公钥

$keyData = openssl_pkey_get_details($pubKey);

$blocks = str_split($mailcont, 1000);

foreach ($blocks as $block) {

//公钥加密

if (!openssl_public_encrypt($block, $chrtext, $keyData['key'])) {

echo "
" . openssl_error_string() . "
";

}

$chrtext .= $chrtext;

}

echo "chrtext-->>>$chrtext
";

$keypath = "/usr/nc-home/webpost/mailbox/d00/1/y/u/yushuai.niu/.user/secretkey/wxd.key";

exec("chmod 777 {$keypath}");

$fp = fopen($keypath, "r");

$key = fread($fp, 8192);

fclose($fp);

$cipher = openssl_pkey_get_private($key);

openssl_private_decrypt($chrtext, $dcyCont, $cipher);

echo "dcyCont-->>>$dcyCont
";

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