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ec_asn1.c
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ec_asn1.c
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/*
* Copyright 2002-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* 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
*/
/*
* ECDSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <string.h>
#include "ec_local.h"
#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include "internal/nelem.h"
#include "crypto/asn1_dsa.h"
#ifndef FIPS_MODULE
/* some structures needed for the asn1 encoding */
typedef struct x9_62_pentanomial_st {
int32_t k1;
int32_t k2;
int32_t k3;
} X9_62_PENTANOMIAL;
typedef struct x9_62_characteristic_two_st {
int32_t m;
ASN1_OBJECT *type;
union {
char *ptr;
/* NID_X9_62_onBasis */
ASN1_NULL *onBasis;
/* NID_X9_62_tpBasis */
ASN1_INTEGER *tpBasis;
/* NID_X9_62_ppBasis */
X9_62_PENTANOMIAL *ppBasis;
/* anything else */
ASN1_TYPE *other;
} p;
} X9_62_CHARACTERISTIC_TWO;
typedef struct x9_62_fieldid_st {
ASN1_OBJECT *fieldType;
union {
char *ptr;
/* NID_X9_62_prime_field */
ASN1_INTEGER *prime;
/* NID_X9_62_characteristic_two_field */
X9_62_CHARACTERISTIC_TWO *char_two;
/* anything else */
ASN1_TYPE *other;
} p;
} X9_62_FIELDID;
typedef struct x9_62_curve_st {
ASN1_OCTET_STRING *a;
ASN1_OCTET_STRING *b;
ASN1_BIT_STRING *seed;
} X9_62_CURVE;
struct ec_parameters_st {
int32_t version;
X9_62_FIELDID *fieldID;
X9_62_CURVE *curve;
ASN1_OCTET_STRING *base;
ASN1_INTEGER *order;
ASN1_INTEGER *cofactor;
} /* ECPARAMETERS */ ;
typedef enum {
ECPKPARAMETERS_TYPE_NAMED = 0,
ECPKPARAMETERS_TYPE_EXPLICIT,
ECPKPARAMETERS_TYPE_IMPLICIT
} ecpk_parameters_type_t;
struct ecpk_parameters_st {
int type;
union {
ASN1_OBJECT *named_curve;
ECPARAMETERS *parameters;
ASN1_NULL *implicitlyCA;
} value;
} /* ECPKPARAMETERS */ ;
/* SEC1 ECPrivateKey */
typedef struct ec_privatekey_st {
int32_t version;
ASN1_OCTET_STRING *privateKey;
ECPKPARAMETERS *parameters;
ASN1_BIT_STRING *publicKey;
} EC_PRIVATEKEY;
/* the OpenSSL ASN.1 definitions */
ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
} static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
} ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
} static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
ASN1_ADB(X9_62_FIELDID) = {
ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
} ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
ASN1_SEQUENCE(X9_62_FIELDID) = {
ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
ASN1_ADB_OBJECT(X9_62_FIELDID)
} static_ASN1_SEQUENCE_END(X9_62_FIELDID)
ASN1_SEQUENCE(X9_62_CURVE) = {
ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
} static_ASN1_SEQUENCE_END(X9_62_CURVE)
ASN1_SEQUENCE(ECPARAMETERS) = {
ASN1_EMBED(ECPARAMETERS, version, INT32),
ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
} ASN1_SEQUENCE_END(ECPARAMETERS)
DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
ASN1_CHOICE(ECPKPARAMETERS) = {
ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
} ASN1_CHOICE_END(ECPKPARAMETERS)
DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
ASN1_SEQUENCE(EC_PRIVATEKEY) = {
ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
} static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
/* some declarations of internal function */
/* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
/* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
/* the function definitions */
static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
{
int ok = 0, nid;
BIGNUM *tmp = NULL;
if (group == NULL || field == NULL)
return 0;
/* clear the old values (if necessary) */
ASN1_OBJECT_free(field->fieldType);
ASN1_TYPE_free(field->p.other);
nid = EC_GROUP_get_field_type(group);
/* set OID for the field */
if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
goto err;
}
if (nid == NID_X9_62_prime_field) {
if ((tmp = BN_new()) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
/* the parameters are specified by the prime number p */
if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
/* set the prime number */
field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
if (field->p.prime == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
} else if (nid == NID_X9_62_characteristic_two_field)
#ifdef OPENSSL_NO_EC2M
{
ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
goto err;
}
#else
{
int field_type;
X9_62_CHARACTERISTIC_TWO *char_two;
field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
char_two = field->p.char_two;
if (char_two == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
char_two->m = (long)EC_GROUP_get_degree(group);
field_type = EC_GROUP_get_basis_type(group);
if (field_type == 0) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
/* set base type OID */
if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
goto err;
}
if (field_type == NID_X9_62_tpBasis) {
unsigned int k;
if (!EC_GROUP_get_trinomial_basis(group, &k))
goto err;
char_two->p.tpBasis = ASN1_INTEGER_new();
if (char_two->p.tpBasis == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
} else if (field_type == NID_X9_62_ppBasis) {
unsigned int k1, k2, k3;
if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
goto err;
char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
if (char_two->p.ppBasis == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
/* set k? values */
char_two->p.ppBasis->k1 = (long)k1;
char_two->p.ppBasis->k2 = (long)k2;
char_two->p.ppBasis->k3 = (long)k3;
} else { /* field_type == NID_X9_62_onBasis */
/* for ONB the parameters are (asn1) NULL */
char_two->p.onBasis = ASN1_NULL_new();
if (char_two->p.onBasis == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
}
}
#endif
else {
ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD);
goto err;
}
ok = 1;
err:
BN_free(tmp);
return ok;
}
static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
{
int ok = 0;
BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
unsigned char *a_buf = NULL, *b_buf = NULL;
size_t len;
if (!group || !curve || !curve->a || !curve->b)
return 0;
if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
/* get a and b */
if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
/*
* Per SEC 1, the curve coefficients must be padded up to size. See C.2's
* definition of Curve, C.1's definition of FieldElement, and 2.3.5's
* definition of how to encode the field elements.
*/
len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
if ((a_buf = OPENSSL_malloc(len)) == NULL
|| (b_buf = OPENSSL_malloc(len)) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
if (BN_bn2binpad(tmp_1, a_buf, len) < 0
|| BN_bn2binpad(tmp_2, b_buf, len) < 0) {
ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
goto err;
}
/* set a and b */
if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
|| !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
/* set the seed (optional) */
if (group->seed) {
if (!curve->seed)
if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
(int)group->seed_len)) {
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
} else {
ASN1_BIT_STRING_free(curve->seed);
curve->seed = NULL;
}
ok = 1;
err:
OPENSSL_free(a_buf);
OPENSSL_free(b_buf);
BN_free(tmp_1);
BN_free(tmp_2);
return ok;
}
ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
ECPARAMETERS *params)
{
size_t len = 0;
ECPARAMETERS *ret = NULL;
const BIGNUM *tmp;
unsigned char *buffer = NULL;
const EC_POINT *point = NULL;
point_conversion_form_t form;
ASN1_INTEGER *orig;
if (params == NULL) {
if ((ret = ECPARAMETERS_new()) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
} else
ret = params;
/* set the version (always one) */
ret->version = (long)0x1;
/* set the fieldID */
if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
/* set the curve */
if (!ec_asn1_group2curve(group, ret->curve)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
/* set the base point */
if ((point = EC_GROUP_get0_generator(group)) == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_GENERATOR);
goto err;
}
form = EC_GROUP_get_point_conversion_form(group);
len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
if (len == 0) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
OPENSSL_free(buffer);
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
ASN1_STRING_set0(ret->base, buffer, len);
/* set the order */
tmp = EC_GROUP_get0_order(group);
if (tmp == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
if (ret->order == NULL) {
ret->order = orig;
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
/* set the cofactor (optional) */
tmp = EC_GROUP_get0_cofactor(group);
if (tmp != NULL) {
ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
if (ret->cofactor == NULL) {
ret->cofactor = orig;
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
}
return ret;
err:
if (params == NULL)
ECPARAMETERS_free(ret);
return NULL;
}
ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
ECPKPARAMETERS *params)
{
int ok = 1, tmp;
ECPKPARAMETERS *ret = params;
if (ret == NULL) {
if ((ret = ECPKPARAMETERS_new()) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
return NULL;
}
} else {
if (ret->type == ECPKPARAMETERS_TYPE_NAMED)
ASN1_OBJECT_free(ret->value.named_curve);
else if (ret->type == ECPKPARAMETERS_TYPE_EXPLICIT
&& ret->value.parameters != NULL)
ECPARAMETERS_free(ret->value.parameters);
}
if (EC_GROUP_get_asn1_flag(group) == OPENSSL_EC_NAMED_CURVE) {
/*
* use the asn1 OID to describe the elliptic curve parameters
*/
tmp = EC_GROUP_get_curve_name(group);
if (tmp) {
ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
ASN1_OBJECT_free(asn1obj);
ERR_raise(ERR_LIB_EC, EC_R_MISSING_OID);
ok = 0;
} else {
ret->type = ECPKPARAMETERS_TYPE_NAMED;
ret->value.named_curve = asn1obj;
}
} else
/* we don't know the nid => ERROR */
ok = 0;
} else {
/* use the ECPARAMETERS structure */
ret->type = ECPKPARAMETERS_TYPE_EXPLICIT;
if ((ret->value.parameters =
EC_GROUP_get_ecparameters(group, NULL)) == NULL)
ok = 0;
}
if (!ok) {
ECPKPARAMETERS_free(ret);
return NULL;
}
return ret;
}
EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
{
int ok = 0, tmp;
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 == NULL
|| params->fieldID->fieldType == NULL
|| params->fieldID->p.ptr == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
/*
* Now extract the curve parameters a and b. Note that, although SEC 1
* specifies the length of their encodings, historical versions of OpenSSL
* encoded them incorrectly, so we must accept any length for backwards
* compatibility.
*/
if (params->curve == NULL
|| params->curve->a == NULL || params->curve->a->data == NULL
|| params->curve->b == NULL || params->curve->b->data == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
if (a == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
goto err;
}
b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
if (b == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
goto err;
}
/* get the field parameters */
tmp = OBJ_obj2nid(params->fieldID->fieldType);
if (tmp == NID_X9_62_characteristic_two_field)
#ifdef OPENSSL_NO_EC2M
{
ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
goto err;
}
#else
{
X9_62_CHARACTERISTIC_TWO *char_two;
char_two = params->fieldID->p.char_two;
field_bits = char_two->m;
if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
goto err;
}
if ((p = BN_new()) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
/* get the base type */
tmp = OBJ_obj2nid(char_two->type);
if (tmp == NID_X9_62_tpBasis) {
long tmp_long;
if (!char_two->p.tpBasis) {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
if (!(char_two->m > tmp_long && tmp_long > 0)) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_TRINOMIAL_BASIS);
goto err;
}
/* create the polynomial */
if (!BN_set_bit(p, (int)char_two->m))
goto err;
if (!BN_set_bit(p, (int)tmp_long))
goto err;
if (!BN_set_bit(p, 0))
goto err;
} else if (tmp == NID_X9_62_ppBasis) {
X9_62_PENTANOMIAL *penta;
penta = char_two->p.ppBasis;
if (penta == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
if (!
(char_two->m > penta->k3 && penta->k3 > penta->k2
&& penta->k2 > penta->k1 && penta->k1 > 0)) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_PENTANOMIAL_BASIS);
goto err;
}
/* create the polynomial */
if (!BN_set_bit(p, (int)char_two->m))
goto err;
if (!BN_set_bit(p, (int)penta->k1))
goto err;
if (!BN_set_bit(p, (int)penta->k2))
goto err;
if (!BN_set_bit(p, (int)penta->k3))
goto err;
if (!BN_set_bit(p, 0))
goto err;
} else if (tmp == NID_X9_62_onBasis) {
ERR_raise(ERR_LIB_EC, EC_R_NOT_IMPLEMENTED);
goto err;
} else { /* error */
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
/* create the EC_GROUP structure */
ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
}
#endif
else if (tmp == NID_X9_62_prime_field) {
/* we have a curve over a prime field */
/* extract the prime number */
if (params->fieldID->p.prime == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
if (p == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
if (BN_is_negative(p) || BN_is_zero(p)) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
goto err;
}
field_bits = BN_num_bits(p);
if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
goto err;
}
/* create the EC_GROUP structure */
ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
} else {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
goto err;
}
if (ret == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
/* extract seed (optional) */
if (params->curve->seed != NULL) {
/*
* This happens for instance with
* fuzz/corpora/asn1/65cf44e85614c62f10cf3b7a7184c26293a19e4a
* and causes the OPENSSL_malloc below to choke on the
* zero length allocation request.
*/
if (params->curve->seed->length == 0) {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
OPENSSL_free(ret->seed);
if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
memcpy(ret->seed, params->curve->seed->data,
params->curve->seed->length);
ret->seed_len = params->curve->seed->length;
}
if (params->order == NULL
|| params->base == NULL
|| params->base->data == NULL
|| params->base->length == 0) {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
goto err;
}
if ((point = EC_POINT_new(ret)) == NULL)
goto err;
/* set the point conversion form */
EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
(params->base->data[0] & ~0x01));
/* extract the ec point */
if (!EC_POINT_oct2point(ret, point, params->base->data,
params->base->length, NULL)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
/* extract the order */
if (ASN1_INTEGER_to_BN(params->order, a) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
if (BN_is_negative(a) || BN_is_zero(a)) {
ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
goto err;
}
if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
goto err;
}
/* extract the cofactor (optional) */
if (params->cofactor == NULL) {
BN_free(b);
b = NULL;
} else if (ASN1_INTEGER_to_BN(params->cofactor, b) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
goto err;
}
/* set the generator, order and cofactor (if present) */
if (!EC_GROUP_set_generator(ret, point, a, b)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
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) {
ERR_raise(ERR_LIB_EC, 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)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
if ((curve_name = ossl_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) {
ERR_raise(ERR_LIB_EC, 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);
/*
* If the input params do not contain the optional seed field we make
* sure it is not added to the returned group.
*
* The seed field is not really used inside libcrypto anyway, and
* adding it to parsed explicit parameter keys would alter their DER
* encoding output (because of the extra field) which could impact
* applications fingerprinting keys by their DER encoding.
*/
if (params->curve->seed == NULL) {
if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
goto err;
}
}
ok = 1;
err:
if (!ok) {
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;
}
EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
{
EC_GROUP *ret = NULL;
int tmp = 0;
if (params == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
return NULL;
}
if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
/* the curve is given by an OID */
tmp = OBJ_obj2nid(params->value.named_curve);
if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
return NULL;
}
EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
} else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
/* the parameters are given by an ECPARAMETERS structure */
ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
if (!ret) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
return NULL;
}
EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
} else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
/* implicit parameters inherited from CA - unsupported */
return NULL;
} else {
ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
return NULL;
}
return ret;
}
/* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
{
EC_GROUP *group = NULL;
ECPKPARAMETERS *params = NULL;
const unsigned char *p = *in;
if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
ECPKPARAMETERS_free(params);
return NULL;
}
if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
ECPKPARAMETERS_free(params);
return NULL;
}
if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
group->decoded_from_explicit_params = 1;
if (a) {
EC_GROUP_free(*a);
*a = group;
}
ECPKPARAMETERS_free(params);
*in = p;
return group;
}
int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
{
int ret = 0;
ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
if (tmp == NULL) {
ERR_raise(ERR_LIB_EC, EC_R_GROUP2PKPARAMETERS_FAILURE);
return 0;
}
if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
ERR_raise(ERR_LIB_EC, EC_R_I2D_ECPKPARAMETERS_FAILURE);
ECPKPARAMETERS_free(tmp);
return 0;
}
ECPKPARAMETERS_free(tmp);
return ret;
}
/* some EC_KEY functions */
EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
{
EC_KEY *ret = NULL;
EC_PRIVATEKEY *priv_key = NULL;
const unsigned char *p = *in;
if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL)
return NULL;
if (a == NULL || *a == NULL) {
if ((ret = EC_KEY_new()) == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
goto err;
}
} else
ret = *a;
if (priv_key->parameters) {
EC_GROUP_free(ret->group);
ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
if (ret->group != NULL
&& priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
ret->group->decoded_from_explicit_params = 1;
}
if (ret->group == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
ret->version = priv_key->version;
if (priv_key->privateKey) {
ASN1_OCTET_STRING *pkey = priv_key->privateKey;
if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
ASN1_STRING_length(pkey)) == 0)
goto err;
} else {
ERR_raise(ERR_LIB_EC, EC_R_MISSING_PRIVATE_KEY);
goto err;
}
if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
EC_POINT_clear_free(ret->pub_key);
ret->pub_key = EC_POINT_new(ret->group);
if (ret->pub_key == NULL) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
if (priv_key->publicKey) {
const unsigned char *pub_oct;
int pub_oct_len;
pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
goto err;
}
} else {
if (ret->group->meth->keygenpub == NULL