mingw-openssl/SOURCES/openssl-1.0.2k-cve-2018-0737.patch
2021-10-08 13:46:48 +00:00

97 lines
3.2 KiB
Diff

diff --git a/crypto/rsa/rsa_gen.c b/crypto/rsa/rsa_gen.c
index c7f1dc3..aa8a7c0 100644
--- a/crypto/rsa/rsa_gen.c
+++ b/crypto/rsa/rsa_gen.c
@@ -177,6 +177,17 @@ static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value,
BIGNUM *pr0, *d, *p;
int bitsp, bitsq, ok = -1, n = 0;
BN_CTX *ctx = NULL;
+ unsigned long error = 0;
+
+ /*
+ * When generating ridiculously small keys, we can get stuck
+ * continually regenerating the same prime values.
+ */
+ if (bits < 16) {
+ ok = 0; /* we set our own err */
+ RSAerr(RSA_F_RSA_BUILTIN_KEYGEN, RSA_R_KEY_SIZE_TOO_SMALL);
+ goto err;
+ }
#ifdef OPENSSL_FIPS
if (FIPS_module_mode()) {
@@ -233,45 +244,55 @@ static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value,
if (BN_copy(rsa->e, e_value) == NULL)
goto err;
+ BN_set_flags(rsa->p, BN_FLG_CONSTTIME);
+ BN_set_flags(rsa->q, BN_FLG_CONSTTIME);
+ BN_set_flags(r2, BN_FLG_CONSTTIME);
/* generate p and q */
for (;;) {
if (!BN_generate_prime_ex(rsa->p, bitsp, 0, NULL, NULL, cb))
goto err;
if (!BN_sub(r2, rsa->p, BN_value_one()))
goto err;
- if (!BN_gcd(r1, r2, rsa->e, ctx))
- goto err;
- if (BN_is_one(r1))
+ ERR_set_mark();
+ if (BN_mod_inverse(r1, r2, rsa->e, ctx) != NULL) {
+ /* GCD == 1 since inverse exists */
break;
+ }
+ error = ERR_peek_last_error();
+ if (ERR_GET_LIB(error) == ERR_LIB_BN
+ && ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
+ /* GCD != 1 */
+ ERR_pop_to_mark();
+ } else {
+ goto err;
+ }
if (!BN_GENCB_call(cb, 2, n++))
goto err;
}
if (!BN_GENCB_call(cb, 3, 0))
goto err;
for (;;) {
- /*
- * When generating ridiculously small keys, we can get stuck
- * continually regenerating the same prime values. Check for this and
- * bail if it happens 3 times.
- */
- unsigned int degenerate = 0;
do {
if (!BN_generate_prime_ex(rsa->q, bitsq, 0, NULL, NULL, cb))
goto err;
if (!BN_sub(r2, rsa->q, rsa->p))
goto err;
- } while ((BN_ucmp(r2, r3) <= 0) && (++degenerate < 3));
- if (degenerate == 3) {
- ok = 0; /* we set our own err */
- RSAerr(RSA_F_RSA_BUILTIN_KEYGEN, RSA_R_KEY_SIZE_TOO_SMALL);
- goto err;
- }
+ } while (BN_ucmp(r2, r3) <= 0);
if (!BN_sub(r2, rsa->q, BN_value_one()))
goto err;
- if (!BN_gcd(r1, r2, rsa->e, ctx))
- goto err;
- if (BN_is_one(r1))
+ ERR_set_mark();
+ if (BN_mod_inverse(r1, r2, rsa->e, ctx) != NULL) {
+ /* GCD == 1 since inverse exists */
break;
+ }
+ error = ERR_peek_last_error();
+ if (ERR_GET_LIB(error) == ERR_LIB_BN
+ && ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
+ /* GCD != 1 */
+ ERR_pop_to_mark();
+ } else {
+ goto err;
+ }
if (!BN_GENCB_call(cb, 2, n++))
goto err;
}