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upstream: use RSA/SHA256 when testing usability of private key;

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based on fix in bz3546 by Dmitry Belyavskiy; with/ok dtucker

OpenBSD-Commit-ID: 0ef414cc363a832f9fab92a5da0234448bce2eba
This commit is contained in:
djm@openbsd.org 2023-03-08 00:05:37 +00:00 committed by Damien Miller
parent eee9f3fc3d
commit 27fd251bc9
No known key found for this signature in database
1 changed files with 5 additions and 3 deletions
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8
ssh-keygen.c
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@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keygen.c,v 1.465 2023/03/05 09:24:35 dtucker Exp $ */
/* $OpenBSD: ssh-keygen.c,v 1.466 2023/03/08 00:05:37 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -476,6 +476,7 @@ do_convert_private_ssh2(struct sshbuf *b)
{
struct sshkey *key = NULL;
char *type, *cipher;
const char *alg = NULL;
u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
int r, rlen, ktype;
u_int magic, i1, i2, i3, i4;
@ -584,6 +585,7 @@ do_convert_private_ssh2(struct sshbuf *b)
if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0)
fatal_fr(r, "generate RSA parameters");
BN_clear_free(rsa_iqmp);
alg = "rsa-sha2-256";
break;
}
rlen = sshbuf_len(b);
@ -592,10 +594,10 @@ do_convert_private_ssh2(struct sshbuf *b)
/* try the key */
if ((r = sshkey_sign(key, &sig, &slen, data, sizeof(data),
NULL, NULL, NULL, 0)) != 0)
alg, NULL, NULL, 0)) != 0)
error_fr(r, "signing with converted key failed");
else if ((r = sshkey_verify(key, sig, slen, data, sizeof(data),
NULL, 0, NULL)) != 0)
alg, 0, NULL)) != 0)
error_fr(r, "verification with converted key failed");
if (r != 0) {
sshkey_free(key);