/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
#include <openssl/bn.h>
#include "dh_locl.h"
+# define DH_NUMBER_ITERATIONS_FOR_PRIME 64
+
+/*-
+ * Check that p and g are suitable enough
+ *
+ * p is odd
+ * 1 < g < p - 1
+ */
+int DH_check_params_ex(const DH *dh)
+{
+ int errflags = 0;
+
+ if (!DH_check_params(dh, &errflags))
+ return 0;
+
+ if ((errflags & DH_CHECK_P_NOT_PRIME) != 0)
+ DHerr(DH_F_DH_CHECK_PARAMS_EX, DH_R_CHECK_P_NOT_PRIME);
+ if ((errflags & DH_NOT_SUITABLE_GENERATOR) != 0)
+ DHerr(DH_F_DH_CHECK_PARAMS_EX, DH_R_NOT_SUITABLE_GENERATOR);
+ if ((errflags & DH_MODULUS_TOO_SMALL) != 0)
+ DHerr(DH_F_DH_CHECK_PARAMS_EX, DH_R_MODULUS_TOO_SMALL);
+ if ((errflags & DH_MODULUS_TOO_LARGE) != 0)
+ DHerr(DH_F_DH_CHECK_PARAMS_EX, DH_R_MODULUS_TOO_LARGE);
+
+ return errflags == 0;
+}
+
+int DH_check_params(const DH *dh, int *ret)
+{
+ int ok = 0;
+ BIGNUM *tmp = NULL;
+ BN_CTX *ctx = NULL;
+
+ *ret = 0;
+ ctx = BN_CTX_new();
+ if (ctx == NULL)
+ goto err;
+ BN_CTX_start(ctx);
+ tmp = BN_CTX_get(ctx);
+ if (tmp == NULL)
+ goto err;
+
+ if (!BN_is_odd(dh->p))
+ *ret |= DH_CHECK_P_NOT_PRIME;
+ if (BN_is_negative(dh->g) || BN_is_zero(dh->g) || BN_is_one(dh->g))
+ *ret |= DH_NOT_SUITABLE_GENERATOR;
+ if (BN_copy(tmp, dh->p) == NULL || !BN_sub_word(tmp, 1))
+ goto err;
+ if (BN_cmp(dh->g, tmp) >= 0)
+ *ret |= DH_NOT_SUITABLE_GENERATOR;
+ if (BN_num_bits(dh->p) < DH_MIN_MODULUS_BITS)
+ *ret |= DH_MODULUS_TOO_SMALL;
+ if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS)
+ *ret |= DH_MODULUS_TOO_LARGE;
+
+ ok = 1;
+ err:
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ok;
+}
+
/*-
* Check that p is a safe prime and
- * if g is 2, 3 or 5, check that it is a suitable generator
- * where
- * for 2, p mod 24 == 11
- * for 3, p mod 12 == 5
- * for 5, p mod 10 == 3 or 7
- * should hold.
+ * g is a suitable generator.
*/
+int DH_check_ex(const DH *dh)
+{
+ int errflags = 0;
+
+ if (!DH_check(dh, &errflags))
+ return 0;
+
+ if ((errflags & DH_NOT_SUITABLE_GENERATOR) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_NOT_SUITABLE_GENERATOR);
+ if ((errflags & DH_CHECK_Q_NOT_PRIME) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_CHECK_Q_NOT_PRIME);
+ if ((errflags & DH_CHECK_INVALID_Q_VALUE) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_CHECK_INVALID_Q_VALUE);
+ if ((errflags & DH_CHECK_INVALID_J_VALUE) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_CHECK_INVALID_J_VALUE);
+ if ((errflags & DH_UNABLE_TO_CHECK_GENERATOR) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_UNABLE_TO_CHECK_GENERATOR);
+ if ((errflags & DH_CHECK_P_NOT_PRIME) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_CHECK_P_NOT_PRIME);
+ if ((errflags & DH_CHECK_P_NOT_SAFE_PRIME) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_CHECK_P_NOT_SAFE_PRIME);
+ if ((errflags & DH_MODULUS_TOO_SMALL) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_MODULUS_TOO_SMALL);
+ if ((errflags & DH_MODULUS_TOO_LARGE) != 0)
+ DHerr(DH_F_DH_CHECK_EX, DH_R_MODULUS_TOO_LARGE);
+
+ return errflags == 0;
+}
int DH_check(const DH *dh, int *ret)
{
int ok = 0, r;
BN_CTX *ctx = NULL;
- BN_ULONG l;
BIGNUM *t1 = NULL, *t2 = NULL;
- *ret = 0;
+ if (!DH_check_params(dh, ret))
+ return 0;
+
ctx = BN_CTX_new();
if (ctx == NULL)
goto err;
BN_CTX_start(ctx);
t1 = BN_CTX_get(ctx);
- if (t1 == NULL)
- goto err;
t2 = BN_CTX_get(ctx);
if (t2 == NULL)
goto err;
if (!BN_is_one(t1))
*ret |= DH_NOT_SUITABLE_GENERATOR;
}
- r = BN_is_prime_ex(dh->q, BN_prime_checks, ctx, NULL);
+ r = BN_is_prime_ex(dh->q, DH_NUMBER_ITERATIONS_FOR_PRIME, ctx, NULL);
if (r < 0)
goto err;
if (!r)
*ret |= DH_CHECK_INVALID_Q_VALUE;
if (dh->j && BN_cmp(dh->j, t1))
*ret |= DH_CHECK_INVALID_J_VALUE;
+ }
- } else if (BN_is_word(dh->g, DH_GENERATOR_2)) {
- l = BN_mod_word(dh->p, 24);
- if (l != 11)
- *ret |= DH_NOT_SUITABLE_GENERATOR;
- } else if (BN_is_word(dh->g, DH_GENERATOR_5)) {
- l = BN_mod_word(dh->p, 10);
- if ((l != 3) && (l != 7))
- *ret |= DH_NOT_SUITABLE_GENERATOR;
- } else
- *ret |= DH_UNABLE_TO_CHECK_GENERATOR;
-
- r = BN_is_prime_ex(dh->p, BN_prime_checks, ctx, NULL);
+ r = BN_is_prime_ex(dh->p, DH_NUMBER_ITERATIONS_FOR_PRIME, ctx, NULL);
if (r < 0)
goto err;
if (!r)
else if (!dh->q) {
if (!BN_rshift1(t1, dh->p))
goto err;
- r = BN_is_prime_ex(t1, BN_prime_checks, ctx, NULL);
+ r = BN_is_prime_ex(t1, DH_NUMBER_ITERATIONS_FOR_PRIME, ctx, NULL);
if (r < 0)
goto err;
- if (!r)
+ if (!r)
*ret |= DH_CHECK_P_NOT_SAFE_PRIME;
}
ok = 1;
err:
- if (ctx != NULL) {
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- }
- return (ok);
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ok;
+}
+
+int DH_check_pub_key_ex(const DH *dh, const BIGNUM *pub_key)
+{
+ int errflags = 0;
+
+ if (!DH_check_pub_key(dh, pub_key, &errflags))
+ return 0;
+
+ if ((errflags & DH_CHECK_PUBKEY_TOO_SMALL) != 0)
+ DHerr(DH_F_DH_CHECK_PUB_KEY_EX, DH_R_CHECK_PUBKEY_TOO_SMALL);
+ if ((errflags & DH_CHECK_PUBKEY_TOO_LARGE) != 0)
+ DHerr(DH_F_DH_CHECK_PUB_KEY_EX, DH_R_CHECK_PUBKEY_TOO_LARGE);
+ if ((errflags & DH_CHECK_PUBKEY_INVALID) != 0)
+ DHerr(DH_F_DH_CHECK_PUB_KEY_EX, DH_R_CHECK_PUBKEY_INVALID);
+
+ return errflags == 0;
}
int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret)
ok = 1;
err:
- if (ctx != NULL) {
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- }
- return (ok);
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ok;
}
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