diff options
Diffstat (limited to 'freebsd/crypto/openssl/crypto/ec/ec_asn1.c')
-rw-r--r-- | freebsd/crypto/openssl/crypto/ec/ec_asn1.c | 73 |
1 files changed, 68 insertions, 5 deletions
diff --git a/freebsd/crypto/openssl/crypto/ec/ec_asn1.c b/freebsd/crypto/openssl/crypto/ec/ec_asn1.c index 1862e26d..26b9e5d8 100644 --- a/freebsd/crypto/openssl/crypto/ec/ec_asn1.c +++ b/freebsd/crypto/openssl/crypto/ec/ec_asn1.c @@ -1,7 +1,7 @@ #include <machine/rtems-bsd-user-space.h> /* - * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved. + * Copyright 2002-2019 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy @@ -570,10 +570,12 @@ ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group, EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params) { int ok = 0, tmp; - EC_GROUP *ret = NULL; + EC_GROUP *ret = NULL, *dup = NULL; BIGNUM *p = NULL, *a = NULL, *b = NULL; EC_POINT *point = NULL; long field_bits; + int curve_name = NID_undef; + BN_CTX *ctx = NULL; if (!params->fieldID || !params->fieldID->fieldType || !params->fieldID->p.ptr) { @@ -791,18 +793,79 @@ EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params) goto err; } + /* + * Check if the explicit parameters group just created matches one of the + * built-in curves. + * + * We create a copy of the group just built, so that we can remove optional + * fields for the lookup: we do this to avoid the possibility that one of + * the optional parameters is used to force the library into using a less + * performant and less secure EC_METHOD instead of the specialized one. + * In any case, `seed` is not really used in any computation, while a + * cofactor different from the one in the built-in table is just + * mathematically wrong anyway and should not be used. + */ + if ((ctx = BN_CTX_new()) == NULL) { + ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB); + goto err; + } + if ((dup = EC_GROUP_dup(ret)) == NULL + || EC_GROUP_set_seed(dup, NULL, 0) != 1 + || !EC_GROUP_set_generator(dup, point, a, NULL)) { + ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); + goto err; + } + if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) { + /* + * The input explicit parameters successfully matched one of the + * built-in curves: often for built-in curves we have specialized + * methods with better performance and hardening. + * + * In this case we replace the `EC_GROUP` created through explicit + * parameters with one created from a named group. + */ + EC_GROUP *named_group = NULL; + +#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128 + /* + * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for + * the same curve, we prefer the SECP nid when matching explicit + * parameters as that is associated with a specialized EC_METHOD. + */ + if (curve_name == NID_wap_wsg_idm_ecid_wtls12) + curve_name = NID_secp224r1; +#endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */ + + if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) { + ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); + goto err; + } + EC_GROUP_free(ret); + ret = named_group; + + /* + * Set the flag so that EC_GROUPs created from explicit parameters are + * serialized using explicit parameters by default. + */ + EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE); + } + ok = 1; err: if (!ok) { - EC_GROUP_clear_free(ret); + EC_GROUP_free(ret); ret = NULL; } + EC_GROUP_free(dup); BN_free(p); BN_free(a); BN_free(b); EC_POINT_free(point); + + BN_CTX_free(ctx); + return ret; } @@ -863,7 +926,7 @@ EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len) } if (a) { - EC_GROUP_clear_free(*a); + EC_GROUP_free(*a); *a = group; } @@ -911,7 +974,7 @@ EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len) ret = *a; if (priv_key->parameters) { - EC_GROUP_clear_free(ret->group); + EC_GROUP_free(ret->group); ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters); } |