Signature Checking Using GnuPG

2013-03-20

从互联网下载一个软件或文件时,官方经常会附上Signature信息。怎么通过Signature校验文件的完整性呢?我们以mysql-5.6.10.tar.gz为例:

1、安装gpg
yum -y install gpg

2、下载程序文件
wget http://cdn.mysql.com/Downloads/MySQL-5.6/mysql-5.6.10.tar.gz

3、下载签名信息保存为mysql-5.6.10.tar.gz.sign文件
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (SunOS)

iD8DBQBQ/7qajHGNO1By4fURAuZtAJ9uO9U+h45eQo4SkGxCwbe3c37FawCgh1cz
Y70Rjpg5cyL9qgiIK6GqitE=
=8rVG
-----END PGP SIGNATURE-----

4、下载公钥文件mysql_pubkey.asc包含内容
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: PGP Universal 2.9.1 (Build 347)
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=Eto8
-----END PGP PUBLIC KEY BLOCK-----
#####################################################################################
5、准备工作
To import the build key into your personal public GPG keyring
#gpg --import mysql_pubkey.asc
#gpg --recv-keys 5072E1F5
删除keys
#gpg --delete-keys 5072E1F5
察看已经导入的keys和signs
#gpg --list-keys
#gpg --list-sigs
6、验证签名
gpg --verify mysql-5.6.10.tar.gz.sign
数据文件如果不存在会提示错误
[root@server14 untar]# gpg --verify mysql-5.6.10.tar.gz.sign
gpg: no signed data
gpg: can't hash datafile: file open error

签名文件和数据文件名称不一致可以这样用:
# gpg --verify mysql.sign mysql-5.6.10.tar.gz
gpg: Signature made Wed 23 Jan 2013 06:25:30 PM CST using DSA key ID 5072E1F5
gpg: Good signature from "MySQL Release Engineering "
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: A4A9 4068 76FC BD3C 4567 70C8 8C71 8D3B 5072 E1F5

7、参考网址:

http://dev.mysql.com/doc/refman/5.6/en/checking-gpg-signature.html

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