openssl_pkcs7_verify()

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

校验一个已签名的 S/MIME 消息的签名

说明

openssl_pkcs7_verify(string $filename,int $flags[,string $outfilename[,array $cainfo[,string $extracerts[,string $content[,string $p7bfilename]]]]]): mixed

openssl_pkcs7_verify()读取给定文件中的 S/MIME 消息并且检查数字签名。

参数

$filename

消息的路径。

$flags

$flags可以用来影响如何校验签名- 参见PKCS7 常量获取更多信息。

$outfilename

如果已指定$outfilename输出文件，它应该是一个用以保存文件的字符串名称，签名消息的个人证书将以PEM的格式保存起来。

$cainfo

如果$cainfo被指定了，它应该保存关于受信任的CA证书的信息供在验证过程中使用- 参见证书校验获取关于该参数的更多信息。

$extracerts

如果$extracerts被指定了，该文件包含了一堆会被作为不受信任的ca使用的证书。

$content

你可以使用$content来指定带有已被验证数据的文件名，该文件内容已去掉了签名信息。

返回值

如果签名已被认证，返回TRUE,如果不正确(消息已被篡改或者签名证书不可用)则返回FALSE,或者- 错误时返回1.

更新日志

注释

Note:正如 RFC 2045中指定的，$filename参数最多不可超过76个字符串。

To verify a .p7m file with openssl_pkcs7_verify() you must convert it to S/MIME format. For example...
<?php
function der2smime($file)
{
  $to=<<<TXT
MIME-Version: 1.0
Content-Disposition: attachment; filename="smime.p7m"
Content-Type: application/x-pkcs7-mime; smime-type=signed-data; name="smime.p7m"
Content-Transfer-Encoding: base64
\n
TXT;
  $from=file_get_contents($file);
  $to.=chunk_split(base64_encode($from));
  return file_put_contents($file,$to);
}
?>

To read signed message in base64 (not encrypted with priv&pub key):
You can just decode content by "base64_decode" or "imap_base64" functions and then erase by hand(regexp) sign from bottom of mail. Unfortunately in my case (mail from Outlook) that message (decoded by "base64_decode") has some additional special chars in some places (ie. before every attachment encoded base_64) what make message e-mail unable to parse.
After couple of hours I solved this:
It's needed to save single e-mail and use 2x "openssl_pkcs7_verify" function in row on original email (with headers and content in base64 ):
 1st use - extract sign (certificate) from e-mail and save to file *.cert
 2nd use - extract (with use that *.cert file) decoded message to file*.out
Code:
 $handle = imap_open('mailbox.eml', '', '');
 $msg = 'home/john/tmp/email1.eml';
 imap_savebody($handle, $msg, 1);
 openssl_pkcs7_verify($msg, 0, $msg . '.cert');
 openssl_pkcs7_verify($msg, 0, $msg . '.cert', array(), $msg . '.cert', $msg.'.out');
 $email_content = file_get_contents($msg . '.out');