Mercurial > dropbear
annotate README @ 1672:3a97f14c0235
Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93)
* Add Chacha20-Poly1305 authenticated encryption
* Add general AEAD approach.
* Add [email protected] algo using LibTomCrypt chacha and
poly1305 routines.
Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated
AES instructions, having the same key size.
Compiling in will add ~5,5kB to binary size on x86-64.
function old new delta
chacha_crypt - 1397 +1397
_poly1305_block - 608 +608
poly1305_done - 595 +595
dropbear_chachapoly_crypt - 457 +457
.rodata 26976 27392 +416
poly1305_process - 290 +290
poly1305_init - 221 +221
chacha_setup - 218 +218
encrypt_packet 1068 1270 +202
dropbear_chachapoly_getlength - 147 +147
decrypt_packet 756 897 +141
chacha_ivctr64 - 137 +137
read_packet 543 637 +94
dropbear_chachapoly_start - 94 +94
read_kex_algos 792 880 +88
chacha_keystream - 69 +69
dropbear_mode_chachapoly - 48 +48
sshciphers 280 320 +40
dropbear_mode_none 24 48 +24
dropbear_mode_ctr 24 48 +24
dropbear_mode_cbc 24 48 +24
dropbear_chachapoly_mac - 24 +24
dropbear_chachapoly - 24 +24
gen_new_keys 848 854 +6
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* Add AES128-GCM and AES256-GCM authenticated encryption
* Add general AES-GCM mode.
* Add [email protected] and [email protected] algo using
LibTomCrypt gcm routines.
AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on
CPU w/o dedicated AES/GHASH instructions therefore disabled by default.
Compiling in will add ~6kB to binary size on x86-64.
function old new delta
gcm_process - 1060 +1060
.rodata 26976 27808 +832
gcm_gf_mult - 820 +820
gcm_add_aad - 660 +660
gcm_shift_table - 512 +512
gcm_done - 471 +471
gcm_add_iv - 384 +384
gcm_init - 347 +347
dropbear_gcm_crypt - 309 +309
encrypt_packet 1068 1270 +202
decrypt_packet 756 897 +141
gcm_reset - 118 +118
read_packet 543 637 +94
read_kex_algos 792 880 +88
sshciphers 280 360 +80
gcm_mult_h - 80 +80
dropbear_gcm_start - 62 +62
dropbear_mode_gcm - 48 +48
dropbear_mode_none 24 48 +24
dropbear_mode_ctr 24 48 +24
dropbear_mode_cbc 24 48 +24
dropbear_ghash - 24 +24
dropbear_gcm_getlength - 24 +24
gen_new_keys 848 854 +6
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(add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes
| author | Vladislav Grishenko <themiron@users.noreply.github.com> |
|---|---|
| date | Mon, 25 May 2020 20:50:25 +0500 |
| parents | d32bcb5c557d |
| children |
| rev | line source |
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1 This is Dropbear, a smallish SSH server and client. |
| 701 | 2 https://matt.ucc.asn.au/dropbear/dropbear.html |
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3 |
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4 INSTALL has compilation instructions. |
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5 |
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6 MULTI has instructions on making a multi-purpose binary (ie a single binary |
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7 which performs multiple tasks, to save disk space) |
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8 |
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9 SMALL has some tips on creating small binaries. |
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10 |
| 1548 | 11 Please contact me if you have any questions/bugs found/features/ideas/comments etc :) |
| 12 There is also a mailing list http://lists.ucc.gu.uwa.edu.au/mailman/listinfo/dropbear | |
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14 Matt Johnston |
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15 [email protected] |
| 380 | 16 |
| 17 | |
| 75 | 18 In the absence of detailed documentation, some notes follow: |
| 72 | 19 ============================================================================ |
| 20 | |
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21 Server public key auth: |
| 72 | 22 |
| 23 You can use ~/.ssh/authorized_keys in the same way as with OpenSSH, just put | |
| 24 the key entries in that file. They should be of the form: | |
| 25 | |
| 26 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAwVa6M6cGVmUcLl2cFzkxEoJd06Ub4bVDsYrWvXhvUV+ZAM9uGuewZBDoAqNKJxoIn0Hyd0Nk/yU99UVv6NWV/5YSHtnf35LKds56j7cuzoQpFIdjNwdxAN0PCET/MG8qyskG/2IE2DPNIaJ3Wy+Ws4IZEgdJgPlTYUBWWtCWOGc= someone@hostname | |
| 27 | |
| 28 You must make sure that ~/.ssh, and the key file, are only writable by the | |
| 290 | 29 user. Beware of editors that split the key into multiple lines. |
| 72 | 30 |
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31 Dropbear supports some options for authorized_keys entries, see the manpage. |
| 72 | 32 |
| 75 | 33 ============================================================================ |
| 34 | |
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35 Client public key auth: |
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36 |
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37 Dropbear can do public key auth as a client, but you will have to convert |
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38 OpenSSH style keys to Dropbear format, or use dropbearkey to create them. |
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39 |
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40 If you have an OpenSSH-style private key ~/.ssh/id_rsa, you need to do: |
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41 |
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42 dropbearconvert openssh dropbear ~/.ssh/id_rsa ~/.ssh/id_rsa.db |
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43 dbclient -i ~/.ssh/id_rsa.db <hostname> |
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44 |
| 874 | 45 Dropbear does not support encrypted hostkeys though can connect to ssh-agent. |
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46 |
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47 ============================================================================ |
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48 |
| 75 | 49 If you want to get the public-key portion of a Dropbear private key, look at |
| 50 dropbearkey's '-y' option. | |
| 51 | |
| 52 ============================================================================ | |
| 53 | |
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54 To run the server, you need to generate server keys, this is one-off: |
| 72 | 55 ./dropbearkey -t rsa -f dropbear_rsa_host_key |
| 56 ./dropbearkey -t dss -f dropbear_dss_host_key | |
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57 ./dropbearkey -t ecdsa -f dropbear_ecdsa_host_key |
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58 ./dropbearkey -t ed25519 -f dropbear_ed25519_host_key |
| 72 | 59 |
| 60 or alternatively convert OpenSSH keys to Dropbear: | |
| 61 ./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key | |
| 62 | |
| 874 | 63 You can also get Dropbear to create keys when the first connection is made - |
| 64 this is preferable to generating keys when the system boots. Make sure | |
| 65 /etc/dropbear/ exists and then pass '-R' to the dropbear server. | |
| 66 | |
| 75 | 67 ============================================================================ |
| 72 | 68 |
| 69 If the server is run as non-root, you most likely won't be able to allocate a | |
| 70 pty, and you cannot login as any user other than that running the daemon | |
| 71 (obviously). Shadow passwords will also be unusable as non-root. | |
| 72 | |
| 75 | 73 ============================================================================ |
| 74 | |
| 72 | 75 The Dropbear distribution includes a standalone version of OpenSSH's scp |
| 76 program. You can compile it with "make scp", you may want to change the path | |
| 161 | 77 of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default |
| 75 | 78 the progress meter isn't compiled in to save space, you can enable it by |
| 79 adding 'SCPPROGRESS=1' to the make commandline. |