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Wim Lewis
nettle
Commits
af951c2d
Commit
af951c2d
authored
Nov 08, 2018
by
Simo Sorce
Committed by
Niels Möller
Nov 25, 2018
Browse files
Catch bad private keys early on.
parent
3f76113c
Changes
1
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2 deletions
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-2
rsa-sign.c
rsa-sign.c
+8
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rsa-sign.c
View file @
af951c2d
...
...
@@ -69,7 +69,13 @@ int
rsa_private_key_prepare
(
struct
rsa_private_key
*
key
)
{
mpz_t
n
;
/* A key is invalid if the sizes of q and c are smaller than
* the size of n, we rely on that property in calculations so
* fail early if that happens. */
if
(
mpz_size
(
key
->
q
)
+
mpz_size
(
key
->
c
)
<
mpz_size
(
key
->
p
))
return
0
;
/* The size of the product is the sum of the sizes of the factors,
* or sometimes one less. It's possible but tricky to compute the
* size without computing the full product. */
...
...
@@ -80,7 +86,7 @@ rsa_private_key_prepare(struct rsa_private_key *key)
key
->
size
=
_rsa_check_size
(
n
);
mpz_clear
(
n
);
return
(
key
->
size
>
0
);
}
...
...
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