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upstream: Expand comment to document rationale for default key 

sizes. "seems worthwhile" deraadt.

OpenBSD-Commit-ID: 72e5c0983d7da1fb72f191870f36cb58263a2456
This commit is contained in:
dtucker@openbsd.org 2019-03-25 16:19:44 +00:00 committed by Damien Miller
parent f47269ea67
commit 26e0cef07b
1 changed files with 10 additions and 3 deletions
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13
ssh-keygen.c
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@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keygen.c,v 1.328 2019/03/25 15:49:00 dtucker Exp $ */
/* $OpenBSD: ssh-keygen.c,v 1.329 2019/03/25 16:19:44 dtucker Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -68,8 +68,15 @@
#endif
/*
* Default number of bits in the RSA/DSA key. This value can be overridden
* on the command line.
* Default number of bits in the RSA, DSA and ECDSA keys. These value can be
* overridden on the command line.
*
* These values, with the exception of DSA, provide security equivalent to at
* least 128 bits of security according to NIST Special Publication 800-57:
* Recommendation for Key Management Part 1 rev 4 section 5.6.1.
* For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for
* which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only
* SHA1 we limit the DSA key size 1k bits.
*/
#define DEFAULT_BITS 3072
#define DEFAULT_BITS_DSA 1024