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| author | Dr. Stephen Henson <steve@openssl.org> | 2017-10-08 22:04:05 +0200 |
|---|---|---|
| committer | Dr. Stephen Henson <steve@openssl.org> | 2017-10-12 03:40:30 +0200 |
| commit | 5f2d9c4d26c923ece6ee04616a2d32a1afc124c8 (patch) | |
| tree | c8904723a53c13363430c40099ff37cfebd52dd6 /crypto/bn | |
| parent | Document EVP_PKEY_set1_engine() (diff) | |
| download | openssl-5f2d9c4d26c923ece6ee04616a2d32a1afc124c8.tar.xz openssl-5f2d9c4d26c923ece6ee04616a2d32a1afc124c8.zip | |
Support constant BN for DH parameters
If BN_FLG_STATIC_DATA is set don't cleanse a->d as it will reside
in read only memory. If BN_FLG_MALLOCED is not set don't modify the
BIGNUM at all.
This change applies to BN_clear_free() and BN_free(). Now the BIGNUM
structure is opaque applications cannot create a BIGNUM structure
without BN_FLG_MALLOCED being set so they are unaffected.
Update internal DH routines so they only copy pointers for read only
parameters.
Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4485)
Diffstat (limited to 'crypto/bn')
| -rw-r--r-- | crypto/bn/bn_lib.c | 21 |
1 files changed, 5 insertions, 16 deletions
diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c index d22a83fc34..ad2a47e09f 100644 --- a/crypto/bn/bn_lib.c +++ b/crypto/bn/bn_lib.c @@ -179,37 +179,26 @@ static void bn_free_d(BIGNUM *a) void BN_clear_free(BIGNUM *a) { - int i; - if (a == NULL) return; - bn_check_top(a); - if (a->d != NULL) { + if (a->d != NULL && !BN_get_flags(a, BN_FLG_STATIC_DATA)) { OPENSSL_cleanse(a->d, a->dmax * sizeof(a->d[0])); - if (!BN_get_flags(a, BN_FLG_STATIC_DATA)) - bn_free_d(a); + bn_free_d(a); } - i = BN_get_flags(a, BN_FLG_MALLOCED); - OPENSSL_cleanse(a, sizeof(*a)); - if (i) + if (BN_get_flags(a, BN_FLG_MALLOCED)) { + OPENSSL_cleanse(a, sizeof(*a)); OPENSSL_free(a); + } } void BN_free(BIGNUM *a) { if (a == NULL) return; - bn_check_top(a); if (!BN_get_flags(a, BN_FLG_STATIC_DATA)) bn_free_d(a); if (a->flags & BN_FLG_MALLOCED) OPENSSL_free(a); - else { -#if OPENSSL_API_COMPAT < 0x00908000L - a->flags |= BN_FLG_FREE; -#endif - a->d = NULL; - } } void bn_init(BIGNUM *a) |