# ssh2_fingerprint

(PECL ssh2 >= 0.9.0)

ssh2_fingerprint — Retrieve fingerprint of remote server

### 说明

ssh2_fingerprint ( resource `$session` [, int `$flags` = SSH2_FINGERPRINT_MD5 | SSH2_FINGERPRINT_HEX ] ) : string

Returns a server hostkey hash from an active session.

### 参数

`session`

  An SSH connection link identifier, obtained from a call to ssh2_connect().

`flags`

  `flags` may be either of `SSH2_FINGERPRINT_MD5` or `SSH2_FINGERPRINT_SHA1` logically ORed with `SSH2_FINGERPRINT_HEX` or `SSH2_FINGERPRINT_RAW`.

### 返回值

Returns the hostkey hash as a string.

### 范例

Example #1 Checking the fingerprint against a known value

    <?php
    $known_host = '6F89C2F0A719B30CC38ABDF90755F2E4';

    $connection = ssh2_connect('shell.example.com', 22);

    $fingerprint = ssh2_fingerprint($connection,
                   SSH2_FINGERPRINT_MD5 | SSH2_FINGERPRINT_HEX);

    if ($fingerprint != $known_host) {
      die("HOSTKEY MISMATCH!\n" .
          "Possible Man-In-The-Middle Attack?");
    }
    ?>