gpgpdump v0.6.0 をリリースした

no extension

OpenPGP パケットの内容を視覚化する gpgpdump の v0.6.0 をリリースした。

OpenPGP 公開鍵サーバにおける公開鍵の汚染問題」を受け, OpenPGP 公開鍵サーバ上の公開鍵を直接検査できるよう HKP アクセスモードを作った。

$ gpgpdump hkp -h
Dumps from OpenPGP key server

Usage:
  gpgpdump hkp [flags] <user id>

Flags:
  -h, --help               help for hkp
      --keyserver string   OpenPGP key server (default "keys.gnupg.net")
      --port int           port number of OpenPGP key server (default 11371)
      --proxy string       URL of proxy server
      --raw                output raw text from OpenPGP key server
      --secure             enable HKP over HTTPS

Global Flags:
  -a, --armor        accepts ASCII input only
      --debug        for debug
      --indent int   indent size for output string
  -i, --int          dumps multi-precision integers
  -j, --json         output with JSON format
  -l, --literal      dumps literal packets (tag 11)
  -m, --marker       dumps marker packets (tag 10)
  -p, --private      dumps private packets (tag 60-63)
  -t, --toml         output with TOML format
  -u, --utc          output with UTC time

HKP (HTTP Keyserver Protocol) に対応する公開鍵サーバであれば公開鍵パケットをダウンロードして解析できる。 たとえば 0x491F9BDF0F7BD4AD の鍵を調べたいなら

$ gpgpdump hkp 0x491F9BDF0F7BD4AD
Public-Key Packet (tag 6) (397 bytes)
    Version: 4 (current)
    Public key creation time: 2008-10-30T02:50:43Z
        49 09 21 03
    Public-key Algorithm: RSA (Encrypt or Sign) (pub 1)
    RSA public modulus n (3072 bits)
    RSA public encryption exponent e (17 bits)
User ID Packet (tag 13) (41 bytes)
    User ID: BuZz spacedout   <satoshin@vistomail.com>
Signature Packet (tag 2) (447 bytes)
    Version: 4 (current)
    Signiture Type: Positive certification of a User ID and Public-Key packet (0x13)
    Public-key Algorithm: RSA (Encrypt or Sign) (pub 1)
    Hash Algorithm: SHA-1 (hash 2)
    Hashed Subpacket (41 bytes)
        Signature Creation Time (sub 2): 2008-10-30T02:50:43Z
        Key Flags (sub 27) (1 bytes)
            Flag: This key may be used to certify other keys.
            Flag: This key may be used to sign data.
        Key Expiration Time (sub 9): 4016.9231134259257 days after (2019-10-30T01:00:00Z)
        Preferred Symmetric Algorithms (sub 11) (6 bytes)
            Symmetric Algorithm: AES with 256-bit key (sym 9)
            Symmetric Algorithm: AES with 192-bit key (sym 8)
            Symmetric Algorithm: AES with 128-bit key (sym 7)
            Symmetric Algorithm: CAST5 (128 bit key, as per) (sym 3)
            Symmetric Algorithm: TripleDES (168 bit key derived from 192) (sym 2)
            Symmetric Algorithm: IDEA (sym 1)
        Preferred Hash Algorithms (sub 21) (5 bytes)
            Hash Algorithm: SHA2-256 (hash 8)
            Hash Algorithm: SHA-1 (hash 2)
            Hash Algorithm: SHA2-384 (hash 9)
            Hash Algorithm: SHA2-512 (hash 10)
            Hash Algorithm: SHA2-224 (hash 11)
        Preferred Compression Algorithms (sub 22) (3 bytes)
            Compression Algorithm: ZLIB <RFC1950> (comp 2)
            Compression Algorithm: BZip2 (comp 3)
            Compression Algorithm: ZIP <RFC1951> (comp 1)
        Features (sub 30) (1 bytes)
            Flag: Modification Detection (packets 18 and 19)
        Key Server Preferences (sub 23) (1 bytes)
            Flag: No-modify
    Unhashed Subpacket (10 bytes)
        Issuer (sub 16): 0x491f9bdf0f7bd4ad
    Hash left 2 bytes
        f5 97
    RSA signature value m^d mod n (3071 bits)
User ID Packet (tag 13) (41 bytes)
    User ID: Satoshi Nakamoto <satoshin@vistomail.com>
Signature Packet (tag 2) (447 bytes)
    Version: 4 (current)
    Signiture Type: Positive certification of a User ID and Public-Key packet (0x13)
    Public-key Algorithm: RSA (Encrypt or Sign) (pub 1)
    Hash Algorithm: SHA-1 (hash 2)
    Hashed Subpacket (41 bytes)
        Signature Creation Time (sub 2): 2008-10-30T02:50:43Z
        Key Flags (sub 27) (1 bytes)
            Flag: This key may be used to certify other keys.
            Flag: This key may be used to sign data.
        Key Expiration Time (sub 9): 4016.9231134259257 days after
        Preferred Symmetric Algorithms (sub 11) (6 bytes)
            Symmetric Algorithm: AES with 256-bit key (sym 9)
            Symmetric Algorithm: AES with 192-bit key (sym 8)
            Symmetric Algorithm: AES with 128-bit key (sym 7)
            Symmetric Algorithm: CAST5 (128 bit key, as per) (sym 3)
            Symmetric Algorithm: TripleDES (168 bit key derived from 192) (sym 2)
            Symmetric Algorithm: IDEA (sym 1)
        Preferred Hash Algorithms (sub 21) (5 bytes)
            Hash Algorithm: SHA2-256 (hash 8)
            Hash Algorithm: SHA-1 (hash 2)
            Hash Algorithm: SHA2-384 (hash 9)
            Hash Algorithm: SHA2-512 (hash 10)
            Hash Algorithm: SHA2-224 (hash 11)
        Preferred Compression Algorithms (sub 22) (3 bytes)
            Compression Algorithm: ZLIB <RFC1950> (comp 2)
            Compression Algorithm: BZip2 (comp 3)
            Compression Algorithm: ZIP <RFC1951> (comp 1)
        Features (sub 30) (1 bytes)
            Flag: Modification Detection (packets 18 and 19)
        Key Server Preferences (sub 23) (1 bytes)
            Flag: No-modify
    Unhashed Subpacket (10 bytes)
        Issuer (sub 16): 0x491f9bdf0f7bd4ad
    Hash left 2 bytes
        f5 97
    RSA signature value m^d mod n (3071 bits)
Public-Subkey Packet (tag 14) (397 bytes)
    Version: 4 (current)
    Public key creation time: 2008-10-30T02:50:43Z
        49 09 21 03
    Public-key Algorithm: RSA (Encrypt or Sign) (pub 1)
    RSA public modulus n (3072 bits)
    RSA public encryption exponent e (17 bits)
Signature Packet (tag 2) (421 bytes)
    Version: 4 (current)
    Signiture Type: Subkey Binding Signature (0x18)
    Public-key Algorithm: RSA (Encrypt or Sign) (pub 1)
    Hash Algorithm: SHA-1 (hash 2)
    Hashed Subpacket (15 bytes)
        Signature Creation Time (sub 2): 2008-10-30T02:50:43Z
        Key Flags (sub 27) (1 bytes)
            Flag: This key may be used to encrypt communications.
            Flag: This key may be used to encrypt storage.
        Key Expiration Time (sub 9): 4016.9231134259257 days after (2019-10-30T01:00:00Z)
    Unhashed Subpacket (10 bytes)
        Issuer (sub 16): 0x491f9bdf0f7bd4ad
    Hash left 2 bytes
        57 48
    RSA signature value m^d mod n (3072 bits)

てな感じにできる。

ちなみに --raw オプションを付けるとダウンロードしたテキストをそのまま表示する。

$ gpgpdump hkp 0x491F9BDF0F7BD4AD --raw
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Public Key Server -- Get "0x491f9bdf0f7bd4ad "</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<style type="text/css">
/*<![CDATA[*/
 .uid { color: green; text-decoration: underline; }
 .warn { color: red; font-weight: bold; }
/*]]>*/
</style></head><body><h1>Public Key Server -- Get "0x491f9bdf0f7bd4ad "</h1>
<pre>
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.1.6
Comment: Hostname: pgpkeys.uk

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FuM+WOGstGTQiEB+Oj6OlJPI9I3YoE8T2VC8m5BrHdIi2W4R1vbuCGry0To7L9MygtuxmGfl
qrUiG0teiKNy0mpZaMDXJHAyLLaamHj25HXcHhq8LyyQHCE6iCcXY8iD/Dma98+ZcEEEQDfO
rmK7HVSU/Rh29VNJ2fgnJM+hhsmJnIPpxt6NIwhtY66U0lKWozOHnJSc1xIMv562NMxQUs3P
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mIdJfsvW5HhKEUydvJCQn8Pm1i69MHB1Pv4ZLzbf/3iiH+/2A9Ug5upwB4+QJPBE7mC+88xn
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5lfHfHwhA4kuoGMdp9a/dmomq71RZ1SfQgeiPae0KVNhdG9zaGkgTmFrYW1vdG8gPHNhdG9z
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3p9/vkW5pezmQqyemaJaEEE75fDGmgiB/nxGPfL8mS4R2LmgUadqquSqhWXk0S9U9Y2z+vFU
LBFt4/M57YWOzryLO/MOPVDFUe604zCXy7s6LVRdjRI8V0h/WzskmEFE9UBwNDpM6jExl9xo
8M1M2ICOewrxE33HoF0dbbW+QFIH2mCWXt8bzfdOvhMTYzaQWOHvYIKPLZqFVDfFC7TBGdY4
mNx2/kxQ5GARUcd1zKI6RoKD60mq1KciTJdJSp5xdCNNfatGgiSFEcYRn8NsWr9nT+5H/yjz
VVFPo9kHgEuxnT8TTeOj189tiLItQUBx/3ZYkAjhIt/hYpo9wif7KSgqjlF6K1n7ZVA=
=LSEt
-----END PGP PUBLIC KEY BLOCK-----
</pre>
</body></html>

これで OpenPGP 公開鍵サーバ上の公開鍵の事前チェックがしやすくなるだろう。

なお,今回の機能追加により既存の機能を若干変更した。 以前ならファイルを指定して調べる場合は

$ gpgpdump sig.asc
Signature Packet (tag 2) (63 bytes)
    Version: 3 (old)
    Hashed material (5 bytes)
        Signiture Type: Signature of a binary document (0x00)
        Signature creation time: 1998-11-27T09:35:42Z
    Key ID: 0xa79778e247b63037
    Public-key Algorithm: DSA (Digital Signature Algorithm) (pub 17)
    Hash Algorithm: SHA-1 (hash 2)
    Hash left 2 bytes
        27 ae
    DSA value r (159 bits)
    DSA value s (159 bits)
Literal Data Packet (tag 11) (45 bytes)
    Literal data format: b (binary)
    File name: hoge
    Modification time of a file: 1975-04-26T19:41:04Z
    Literal data (35 bytes)

でよかったが,このバージョンからは -f オプションでファイルを指定する必要がある。

$ gpgpdump -f sig.asc
Signature Packet (tag 2) (63 bytes)
    Version: 3 (old)
    Hashed material (5 bytes)
        Signiture Type: Signature of a binary document (0x00)
        Signature creation time: 1998-11-27T09:35:42Z
    Key ID: 0xa79778e247b63037
    Public-key Algorithm: DSA (Digital Signature Algorithm) (pub 17)
    Hash Algorithm: SHA-1 (hash 2)
    Hash left 2 bytes
        27 ae
    DSA value r (159 bits)
    DSA value s (159 bits)
Literal Data Packet (tag 11) (45 bytes)
    Literal data format: b (binary)
    File name: hoge
    Modification time of a file: 1975-04-26T19:41:04Z
    Literal data (35 bytes)

いや,マジすんません。

パイプを使う場合は今までどおり

$ cat sig.asc | gpgpdump
Signature Packet (tag 2) (63 bytes)
    Version: 3 (old)
    Hashed material (5 bytes)
        Signiture Type: Signature of a binary document (0x00)
        Signature creation time: 1998-11-27T09:35:42Z
    Key ID: 0xa79778e247b63037
    Public-key Algorithm: DSA (Digital Signature Algorithm) (pub 17)
    Hash Algorithm: SHA-1 (hash 2)
    Hash left 2 bytes
        27 ae
    DSA value r (159 bits)
    DSA value s (159 bits)
Literal Data Packet (tag 11) (45 bytes)
    Literal data format: b (binary)
    File name: hoge
    Modification time of a file: 1975-04-26T19:41:04Z
    Literal data (35 bytes)

でオッケ。

ブックマーク

参考図書

photo
暗号技術入門 第3版 秘密の国のアリス
結城 浩
SBクリエイティブ 2015-08-25 (Release 2015-09-17)
eBooks Kindle版
ASIN: B015643CPE
評価     

SHA-3 や Bitcoin/Blockchain など新しい知見や技術要素を大幅追加。暗号技術を使うだけならこれ1冊でとりあえず無問題。

reviewed by Spiegel on 2015-09-20 (powered by amazon-item v0.2.0)