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Add ossl_bn_priv_rand_range_fixed_top() and use it for EC/DSA

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Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24265)
This commit is contained in:
Tomas Mraz 2024-04-25 19:26:08 +02:00
parent 2d285fa873
commit 13b3ca5c99
4 changed files with 49 additions and 6 deletions
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45
crypto/bn/bn_rand.c
View File

@ -184,8 +184,8 @@ static int bnrand_range(BNRAND_FLAG flag, BIGNUM *r, const BIGNUM *range,
} else {
do {
/* range = 11..._2 or range = 101..._2 */
if (!bnrand(flag, r, n, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY, 0,
ctx))
if (!bnrand(flag, r, n, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY,
strength, ctx))
return 0;
if (!--count) {
@ -238,6 +238,47 @@ int BN_pseudo_rand_range(BIGNUM *r, const BIGNUM *range)
# endif
#endif
int ossl_bn_priv_rand_range_fixed_top(BIGNUM *r, const BIGNUM *range,
unsigned int strength, BN_CTX *ctx)
{
int n;
int count = 100;
if (r == NULL) {
ERR_raise(ERR_LIB_BN, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (range->neg || BN_is_zero(range)) {
ERR_raise(ERR_LIB_BN, BN_R_INVALID_RANGE);
return 0;
}
n = BN_num_bits(range); /* n > 0 */
/* BN_is_bit_set(range, n - 1) always holds */
if (n == 1) {
BN_zero(r);
} else {
BN_set_flags(r, BN_FLG_CONSTTIME);
do {
if (!bnrand(PRIVATE, r, n + 1, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY,
strength, ctx))
return 0;
if (!--count) {
ERR_raise(ERR_LIB_BN, BN_R_TOO_MANY_ITERATIONS);
return 0;
}
ossl_bn_mask_bits_fixed_top(r, n);
}
while (BN_ucmp(r, range) >= 0);
}
return 1;
}
/*
* BN_generate_dsa_nonce generates a random number 0 <= out < range. Unlike
* BN_rand_range, it also includes the contents of |priv| and |message| in

4
crypto/dsa/dsa_ossl.c
View File

@ -286,9 +286,9 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
dlen, ctx))
goto err;
}
} else if (!BN_priv_rand_range_ex(k, dsa->params.q, 0, ctx))
} else if (!ossl_bn_priv_rand_range_fixed_top(k, dsa->params.q, 0, ctx))
goto err;
} while (BN_is_zero(k));
} while (ossl_bn_is_word_fixed_top(k, 0));
BN_set_flags(k, BN_FLG_CONSTTIME);
BN_set_flags(l, BN_FLG_CONSTTIME);

4
crypto/ec/ecdsa_ossl.c
View File

@ -202,13 +202,13 @@ static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in,
ctx);
}
} else {
res = BN_priv_rand_range_ex(k, order, 0, ctx);
res = ossl_bn_priv_rand_range_fixed_top(k, order, 0, ctx);
}
if (!res) {
ERR_raise(ERR_LIB_EC, EC_R_RANDOM_NUMBER_GENERATION_FAILED);
goto err;
}
} while (BN_is_zero(k));
} while (ossl_bn_is_word_fixed_top(k, 0));
/* compute r the x-coordinate of generator * k */
if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) {

2
include/crypto/bn.h
View File

@ -89,6 +89,8 @@ int bn_div_fixed_top(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
const BIGNUM *d, BN_CTX *ctx);
int ossl_bn_mask_bits_fixed_top(BIGNUM *a, int n);
int ossl_bn_is_word_fixed_top(const BIGNUM *a, BN_ULONG w);
int ossl_bn_priv_rand_range_fixed_top(BIGNUM *r, const BIGNUM *range,
unsigned int strength, BN_CTX *ctx);
#define BN_PRIMETEST_COMPOSITE 0
#define BN_PRIMETEST_COMPOSITE_WITH_FACTOR 1