Hi, I sent this patch back inn april and I still have a need for this. Would it be possible to get any pointers how we can have `hashalg` selectable by `ssh-keygen -Y`? -- Morten Linderud PGP: 9C02FF419FECBE16 On Thu, Apr 11, 2024 at 09:16:39PM +0200, Morten Linderud wrote: > `ssh-keygen -Y sign` only selects the signing algorithm `rsa-sha2-512` > and this prevents ssh-agent implementations that can't support sha512 > from signing messages. > > An example of this is TPMs which mostly only really supports sha256 > widely. > > This change enables `ssh-keygen -Y sign` to honor the `hashalg` option > for the signing algorithm. > > Signed-off-by: Morten Linderud <morten@xxxxxxxxxxx> > --- > sshsig.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/sshsig.c b/sshsig.c > index 470b286a3..033b43353 100644 > --- a/sshsig.c > +++ b/sshsig.c > @@ -190,8 +190,14 @@ sshsig_wrap_sign(struct sshkey *key, const char *hashalg, > } > > /* If using RSA keys then default to a good signature algorithm */ > - if (sshkey_type_plain(key->type) == KEY_RSA) > - sign_alg = RSA_SIGN_ALG; > + if (sshkey_type_plain(key->type) == KEY_RSA){ > + if (hashalg == NULL) > + sign_alg = RSA_SIGN_ALG; > + else if (strcmp(hashalg, "sha256") == 0) > + sign_alg = "rsa-sha2-256"; > + else if (strcmp(hashalg, "sha512") == 0) > + sign_alg = "rsa-sha2-512"; > + } > > if (signer != NULL) { > if ((r = signer(key, &sig, &slen, > -- > 2.44.0 > _______________________________________________ > openssh-unix-dev mailing list > openssh-unix-dev@xxxxxxxxxxx > https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
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