CentOS 6.x OpenSSH パッケージで ecdsa アルゴリズムをサポートしているのはどのバージョンからなのか

```
$ uname -a
Linux vserver-test11.fcxlocal 2.6.32-431.29.2.el6.x86_64 #1 SMP Tue Sep 9 21:36:05 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
```
```
$ cat /etc/redhat-release
CentOS release 6.5 (Final)
```
```
$ rpm -qa | grep -i openssh
openssh-server-5.3p1-94.el6.x86_64
openssh-5.3p1-94.el6.x86_64
openssh-clients-5.3p1-94.el6.x86_64
```
```
$ man sshd_config 
```
openssh-server-5.3p1-94.el6 では、manual 上ではオプションにて、ecdsa パラメータは
サポートされていない状態。ecdsa 公開鍵・秘密鍵ペアで認証も失敗。
※実際に接続失敗したログ残せてません。すみません。

```
$ sudo yum update openss-seh-server
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile

epel/metalink                                            | 5.8 kB     00:00     
 * base: www.ftp.ne.jp
 * epel: ftp.riken.jp
 * extras: www.ftp.ne.jp
 * updates: www.ftp.ne.jp

base                                                     | 3.7 kB     00:00     
epel                                                     | 4.3 kB     00:00     
extras                                                   | 3.4 kB     00:00     
updates                                                  | 3.4 kB     00:00     
updates/primary_db                                       | 4.8 MB     00:00     
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package openssh-server.x86_64 0:5.3p1-94.el6 will be updated
---> Package openssh-server.x86_64 0:5.3p1-118.1.el6_8 will be an update
--> Processing Dependency: openssh = 5.3p1-118.1.el6_8 for package: openssh-server-5.3p1-118.1.el6_8.x86_64
--> Running transaction check
---> Package openssh.x86_64 0:5.3p1-94.el6 will be updated
--> Processing Dependency: openssh = 5.3p1-94.el6 for package: openssh-clients-5.3p1-94.el6.x86_64
---> Package openssh.x86_64 0:5.3p1-118.1.el6_8 will be an update
--> Running transaction check
---> Package openssh-clients.x86_64 0:5.3p1-94.el6 will be updated
---> Package openssh-clients.x86_64 0:5.3p1-118.1.el6_8 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package               Arch         Version                 Repository     Size
================================================================================
Updating:
 openssh-server        x86_64       5.3p1-118.1.el6_8       updates       328 k
Updating for dependencies:
 openssh               x86_64       5.3p1-118.1.el6_8       updates       276 k
 openssh-clients       x86_64       5.3p1-118.1.el6_8       updates       442 k

Transaction Summary
================================================================================
Upgrade       3 Package(s)

Total download size: 1.0 M
Is this ok [y/N]: y
Downloading Packages:

(1/3): openssh-5.3p1-118.1.el6_8.x86_64.rpm              | 276 kB     00:00     
(2/3): openssh-clients-5.3p1-118.1.el6_8.x86_64.rpm      | 442 kB     00:00     
(3/3): openssh-server-5.3p1-118.1.el6_8.x86_64.rpm       | 328 kB     00:00     
--------------------------------------------------------------------------------
Total                                           7.3 MB/s | 1.0 MB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction

  Updating   : openssh-5.3p1-118.1.el6_8.x86_64                             1/6 
  Updating   : openssh-server-5.3p1-118.1.el6_8.x86_64                      2/6 
  Updating   : openssh-clients-5.3p1-118.1.el6_8.x86_64                     3/6 

  Cleanup    : openssh-clients-5.3p1-94.el6.x86_64                          4/6 
  Cleanup    : openssh-server-5.3p1-94.el6.x86_64                           5/6 
  Cleanup    : openssh-5.3p1-94.el6.x86_64                                  6/6 

  Verifying  : openssh-5.3p1-118.1.el6_8.x86_64                             1/6 
  Verifying  : openssh-server-5.3p1-118.1.el6_8.x86_64                      2/6 
  Verifying  : openssh-clients-5.3p1-118.1.el6_8.x86_64                     3/6 

  Verifying  : openssh-5.3p1-94.el6.x86_64                                  4/6 
  Verifying  : openssh-server-5.3p1-94.el6.x86_64                           5/6 
  Verifying  : openssh-clients-5.3p1-94.el6.x86_64                          6/6 

Updated:
  openssh-server.x86_64 0:5.3p1-118.1.el6_8                                     

Dependency Updated:
  openssh.x86_64 0:5.3p1-118.1.el6_8 openssh-clients.x86_64 0:5.3p1-118.1.el6_8

Complete!
```
```
$ rpm -qa | grep openssh
openssh-5.3p1-118.1.el6_8.x86_64
openssh-clients-5.3p1-118.1.el6_8.x86_64
openssh-server-5.3p1-118.1.el6_8.x86_64
```
```
$ man sshd_config 
```
openssh-5.3p1-118.1.el6_8 では、manual 上ではオプションにて、ecdsa パラメータは
サポートされている状態。ecdsa 公開鍵・秘密鍵ペアで認証成功。
※実際に接続成功したログ残せてません。すみません。

少なくとも、openssh-server-5.3p1-94.el6　と openssh-5.3p1-118.1.el6_8 との間で
openssh 5.7 から ecdsa 対応機能がバックポートされたと考えられます。
OpenSSH 5.7 リリースノート : https://www.openssh.com/txt/release-5.7

関係ないですけど、Qiita の markdown 対応エディター画面、右にリアルタイムプレビュー
でるの確認し易くてすごくいいすね。