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- /*
- * Copyright 2002-2021 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.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_BN_LIB);
- 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_ASN1_LIB);
- 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_ASN1_LIB);
- 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_ASN1_LIB);
- 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_ASN1_LIB);
- 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_BN_LIB);
- 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)
- 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_ASN1_LIB);
- goto err;
- }
- ossl_asn1_string_set_bits_left(curve->seed, 0);
- 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_ASN1_LIB);
- 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_ASN1_LIB);
- 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_ASN1_LIB);
- 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_BN_LIB);
- 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)
- 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_EC_LIB);
- 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
- || ret->group->meth->keygenpub(ret) == 0)
- goto err;
- /* Remember the original private-key-only encoding. */
- ret->enc_flag |= EC_PKEY_NO_PUBKEY;
- }
- if (a)
- *a = ret;
- EC_PRIVATEKEY_free(priv_key);
- *in = p;
- ret->dirty_cnt++;
- return ret;
- err:
- if (a == NULL || *a != ret)
- EC_KEY_free(ret);
- EC_PRIVATEKEY_free(priv_key);
- return NULL;
- }
- int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
- {
- int ret = 0, ok = 0;
- unsigned char *priv= NULL, *pub= NULL;
- size_t privlen = 0, publen = 0;
- EC_PRIVATEKEY *priv_key = NULL;
- if (a == NULL || a->group == NULL ||
- (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
- ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
- goto err;
- }
- if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- goto err;
- }
- priv_key->version = a->version;
- privlen = EC_KEY_priv2buf(a, &priv);
- if (privlen == 0) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- goto err;
- }
- ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
- priv = NULL;
- if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
- if ((priv_key->parameters =
- EC_GROUP_get_ecpkparameters(a->group,
- priv_key->parameters)) == NULL) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- goto err;
- }
- }
- if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
- priv_key->publicKey = ASN1_BIT_STRING_new();
- if (priv_key->publicKey == NULL) {
- ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
- goto err;
- }
- publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
- if (publen == 0) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- goto err;
- }
- ossl_asn1_string_set_bits_left(priv_key->publicKey, 0);
- ASN1_STRING_set0(priv_key->publicKey, pub, publen);
- pub = NULL;
- }
- if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- goto err;
- }
- ok = 1;
- err:
- OPENSSL_clear_free(priv, privlen);
- OPENSSL_free(pub);
- EC_PRIVATEKEY_free(priv_key);
- return (ok ? ret : 0);
- }
- int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
- {
- if (a == NULL) {
- ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- return i2d_ECPKParameters(a->group, out);
- }
- EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
- {
- EC_KEY *ret;
- if (in == NULL || *in == NULL) {
- ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
- return NULL;
- }
- if (a == NULL || *a == NULL) {
- if ((ret = EC_KEY_new()) == NULL) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- return NULL;
- }
- } else
- ret = *a;
- if (!d2i_ECPKParameters(&ret->group, in, len)) {
- if (a == NULL || *a != ret)
- EC_KEY_free(ret);
- else
- ret->dirty_cnt++;
- return NULL;
- }
- if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
- EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
- ret->dirty_cnt++;
- if (a)
- *a = ret;
- return ret;
- }
- EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
- {
- EC_KEY *ret = NULL;
- if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
- /*
- * sorry, but a EC_GROUP-structure is necessary to set the public key
- */
- ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- ret = *a;
- /* EC_KEY_opt2key updates dirty_cnt */
- if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- return 0;
- }
- *in += len;
- return ret;
- }
- int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
- {
- size_t buf_len = 0;
- int new_buffer = 0;
- if (a == NULL) {
- ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- buf_len = EC_POINT_point2oct(a->group, a->pub_key,
- a->conv_form, NULL, 0, NULL);
- if (out == NULL || buf_len == 0)
- /* out == NULL => just return the length of the octet string */
- return buf_len;
- if (*out == NULL) {
- if ((*out = OPENSSL_malloc(buf_len)) == NULL)
- return 0;
- new_buffer = 1;
- }
- if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
- *out, buf_len, NULL)) {
- ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
- if (new_buffer) {
- OPENSSL_free(*out);
- *out = NULL;
- }
- return 0;
- }
- if (!new_buffer)
- *out += buf_len;
- return buf_len;
- }
- DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
- DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
- #endif /* FIPS_MODULE */
- ECDSA_SIG *ECDSA_SIG_new(void)
- {
- ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
- return sig;
- }
- void ECDSA_SIG_free(ECDSA_SIG *sig)
- {
- if (sig == NULL)
- return;
- BN_clear_free(sig->r);
- BN_clear_free(sig->s);
- OPENSSL_free(sig);
- }
- ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
- {
- ECDSA_SIG *sig;
- if (len < 0)
- return NULL;
- if (psig != NULL && *psig != NULL) {
- sig = *psig;
- } else {
- sig = ECDSA_SIG_new();
- if (sig == NULL)
- return NULL;
- }
- if (sig->r == NULL)
- sig->r = BN_new();
- if (sig->s == NULL)
- sig->s = BN_new();
- if (sig->r == NULL || sig->s == NULL
- || ossl_decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
- if (psig == NULL || *psig == NULL)
- ECDSA_SIG_free(sig);
- return NULL;
- }
- if (psig != NULL && *psig == NULL)
- *psig = sig;
- return sig;
- }
- int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
- {
- BUF_MEM *buf = NULL;
- size_t encoded_len;
- WPACKET pkt;
- if (ppout == NULL) {
- if (!WPACKET_init_null(&pkt, 0))
- return -1;
- } else if (*ppout == NULL) {
- if ((buf = BUF_MEM_new()) == NULL
- || !WPACKET_init_len(&pkt, buf, 0)) {
- BUF_MEM_free(buf);
- return -1;
- }
- } else {
- if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
- return -1;
- }
- if (!ossl_encode_der_dsa_sig(&pkt, sig->r, sig->s)
- || !WPACKET_get_total_written(&pkt, &encoded_len)
- || !WPACKET_finish(&pkt)) {
- BUF_MEM_free(buf);
- WPACKET_cleanup(&pkt);
- return -1;
- }
- if (ppout != NULL) {
- if (*ppout == NULL) {
- *ppout = (unsigned char *)buf->data;
- buf->data = NULL;
- BUF_MEM_free(buf);
- } else {
- *ppout += encoded_len;
- }
- }
- return (int)encoded_len;
- }
- void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
- {
- if (pr != NULL)
- *pr = sig->r;
- if (ps != NULL)
- *ps = sig->s;
- }
- const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
- {
- return sig->r;
- }
- const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
- {
- return sig->s;
- }
- int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
- {
- if (r == NULL || s == NULL)
- return 0;
- BN_clear_free(sig->r);
- BN_clear_free(sig->s);
- sig->r = r;
- sig->s = s;
- return 1;
- }
- int ECDSA_size(const EC_KEY *ec)
- {
- int ret;
- ECDSA_SIG sig;
- const EC_GROUP *group;
- const BIGNUM *bn;
- if (ec == NULL)
- return 0;
- group = EC_KEY_get0_group(ec);
- if (group == NULL)
- return 0;
- bn = EC_GROUP_get0_order(group);
- if (bn == NULL)
- return 0;
- sig.r = sig.s = (BIGNUM *)bn;
- ret = i2d_ECDSA_SIG(&sig, NULL);
- if (ret < 0)
- ret = 0;
- return ret;
- }
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