Module Name: src
Committed By: christos
Date: Wed Apr 10 17:55:31 UTC 2019
Modified Files:
src/external/bsd/wpa/dist/src/crypto: crypto_openssl.c
Log Message:
This helps in reducing measurable timing differences in operations
involving private information. BoringSSL has removed BN_FLG_CONSTTIME
and expects specific constant time functions to be called instead, so a
bit different approach is needed depending on which library is used.
The main operation that needs protection against side channel attacks is
BN_mod_exp() that depends on private keys (the public key validation
step in crypto_dh_derive_secret() is an exception that can use the
faster version since it does not depend on private keys).
crypto_bignum_div() is currently used only in SAE FFC case with not
safe-prime groups and only with values that do not depend on private
keys, so it is not critical to protect it.
crypto_bignum_inverse() is currently used only in SAE FFC PWE
derivation. The additional protection here is targeting only OpenSSL.
BoringSSL may need conversion to using BN_mod_inverse_blinded().
This is related to CVE-2019-9494 and CVE-2019-9495.
To generate a diff of this commit:
cvs rdiff -u -r1.1.1.7 -r1.2 \
src/external/bsd/wpa/dist/src/crypto/crypto_openssl.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/external/bsd/wpa/dist/src/crypto/crypto_openssl.c
diff -u src/external/bsd/wpa/dist/src/crypto/crypto_openssl.c:1.1.1.7 src/external/bsd/wpa/dist/src/crypto/crypto_openssl.c:1.2
--- src/external/bsd/wpa/dist/src/crypto/crypto_openssl.c:1.1.1.7 Fri Jan 4 14:29:19 2019
+++ src/external/bsd/wpa/dist/src/crypto/crypto_openssl.c Wed Apr 10 13:55:31 2019
@@ -549,7 +549,8 @@ int crypto_mod_exp(const u8 *base, size_
bn_result == NULL)
goto error;
- if (BN_mod_exp(bn_result, bn_base, bn_exp, bn_modulus, ctx) != 1)
+ if (BN_mod_exp_mont_consttime(bn_result, bn_base, bn_exp, bn_modulus,
+ ctx, NULL) != 1)
goto error;
*result_len = BN_bn2bin(bn_result, result);
@@ -1295,8 +1296,9 @@ int crypto_bignum_exptmod(const struct c
bnctx = BN_CTX_new();
if (bnctx == NULL)
return -1;
- res = BN_mod_exp((BIGNUM *) d, (const BIGNUM *) a, (const BIGNUM *) b,
- (const BIGNUM *) c, bnctx);
+ res = BN_mod_exp_mont_consttime((BIGNUM *) d, (const BIGNUM *) a,
+ (const BIGNUM *) b, (const BIGNUM *) c,
+ bnctx, NULL);
BN_CTX_free(bnctx);
return res ? 0 : -1;
@@ -1315,6 +1317,11 @@ int crypto_bignum_inverse(const struct c
bnctx = BN_CTX_new();
if (bnctx == NULL)
return -1;
+#ifdef OPENSSL_IS_BORINGSSL
+ /* TODO: use BN_mod_inverse_blinded() ? */
+#else /* OPENSSL_IS_BORINGSSL */
+ BN_set_flags((BIGNUM *) a, BN_FLG_CONSTTIME);
+#endif /* OPENSSL_IS_BORINGSSL */
res = BN_mod_inverse((BIGNUM *) c, (const BIGNUM *) a,
(const BIGNUM *) b, bnctx);
BN_CTX_free(bnctx);
@@ -1348,6 +1355,9 @@ int crypto_bignum_div(const struct crypt
bnctx = BN_CTX_new();
if (bnctx == NULL)
return -1;
+#ifndef OPENSSL_IS_BORINGSSL
+ BN_set_flags((BIGNUM *) a, BN_FLG_CONSTTIME);
+#endif /* OPENSSL_IS_BORINGSSL */
res = BN_div((BIGNUM *) c, NULL, (const BIGNUM *) a,
(const BIGNUM *) b, bnctx);
BN_CTX_free(bnctx);
@@ -1439,8 +1449,8 @@ int crypto_bignum_legendre(const struct
/* exp = (p-1) / 2 */
!BN_sub(exp, (const BIGNUM *) p, BN_value_one()) ||
!BN_rshift1(exp, exp) ||
- !BN_mod_exp(tmp, (const BIGNUM *) a, exp, (const BIGNUM *) p,
- bnctx))
+ !BN_mod_exp_mont_consttime(tmp, (const BIGNUM *) a, exp,
+ (const BIGNUM *) p, bnctx, NULL))
goto fail;
if (BN_is_word(tmp, 1))
