/* * Copyright 2002-2021 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 * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include "ec_local.h" #include #include #include #include "internal/nelem.h" int EC_GROUP_get_basis_type(const EC_GROUP *group) { int i; if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != NID_X9_62_characteristic_two_field) /* everything else is currently not supported */ return 0; /* Find the last non-zero element of group->poly[] */ for (i = 0; i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0; i++) continue; if (i == 4) return NID_X9_62_ppBasis; else if (i == 2) return NID_X9_62_tpBasis; else /* everything else is currently not supported */ return 0; } #ifndef OPENSSL_NO_EC2M int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k) { if (group == NULL) return 0; if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != NID_X9_62_characteristic_two_field || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0))) { ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); return 0; } if (k) *k = group->poly[1]; return 1; } int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1, unsigned int *k2, unsigned int *k3) { if (group == NULL) return 0; if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != NID_X9_62_characteristic_two_field || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0))) { ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); return 0; } if (k1) *k1 = group->poly[3]; if (k2) *k2 = group->poly[2]; if (k3) *k3 = group->poly[1]; return 1; } #endif /* 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_const(ECPKPARAMETERS) DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS) IMPLEMENT_ASN1_FUNCTIONS_const(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_const(EC_PRIVATEKEY) DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY) IMPLEMENT_ASN1_FUNCTIONS_const(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_METHOD_get_field_type(EC_GROUP_method_of(group)); /* set OID for the field */ if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB); goto err; } if (nid == NID_X9_62_prime_field) { if ((tmp = BN_new()) == NULL) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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)) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); goto err; } /* set the prime number */ field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL); if (field->p.prime == NULL) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB); goto err; } } else if (nid == NID_X9_62_characteristic_two_field) #ifdef OPENSSL_NO_EC2M { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); goto err; } /* set base type OID */ if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); goto err; } if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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) { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); goto err; } } } #endif else { ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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) { ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); goto err; } /* get a and b */ if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) { ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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) { ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); goto err; } if (BN_bn2binpad(tmp_1, a_buf, len) < 0 || BN_bn2binpad(tmp_2, b_buf, len) < 0) { ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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)) { ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB); goto err; } /* set the seed (optional) */ if (group->seed) { if (!curve->seed) if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) { ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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)) { ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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) { ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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)) { ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); goto err; } /* set the curve */ if (!ec_asn1_group2curve(group, ret->curve)) { ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); goto err; } /* set the base point */ if ((point = EC_GROUP_get0_generator(group)) == NULL) { ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); goto err; } if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) { OPENSSL_free(buffer); ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); goto err; } ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order); if (ret->order == NULL) { ret->order = orig; ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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; ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, 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)) { /* * 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); ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, 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 || !params->fieldID->fieldType || !params->fieldID->p.ptr) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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 || !params->curve->a || !params->curve->a->data || !params->curve->b || !params->curve->b->data) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); goto err; } a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL); if (a == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB); goto err; } b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL); if (b == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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 { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE); goto err; } if ((p = BN_new()) == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); goto err; } tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis); if (!(char_two->m > tmp_long && tmp_long > 0)) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); goto err; } if (! (char_two->m > penta->k3 && penta->k3 > penta->k2 && penta->k2 > penta->k1 && penta->k1 > 0)) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED); goto err; } else { /* error */ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); goto err; } p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL); if (p == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); goto err; } if (BN_is_negative(p) || BN_is_zero(p)) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD); goto err; } field_bits = BN_num_bits(p); if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE); goto err; } /* create the EC_GROUP structure */ ret = EC_GROUP_new_curve_GFp(p, a, b, NULL); } else { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD); goto err; } if (ret == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); goto err; } /* extract seed (optional) */ if (params->curve->seed != NULL) { OPENSSL_free(ret->seed); if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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)) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); goto err; } /* extract the order */ if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); goto err; } if (BN_is_negative(a) || BN_is_zero(a)) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER); goto err; } if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */ ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER); goto err; } /* extract the cofactor (optional) */ if (params->cofactor == NULL) { BN_free(b); b = NULL; } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); goto err; } /* set the generator, order and cofactor (if present) */ if (!EC_GROUP_set_generator(ret, point, a, b)) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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) { 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); /* * 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, 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) { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, 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 { ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, 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) { ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE); ECPKPARAMETERS_free(params); return NULL; } if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) { ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE); 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) { ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE); return 0; } if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) { ECerr(EC_F_I2D_ECPKPARAMETERS, 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) { ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); return NULL; } if (a == NULL || *a == NULL) { if ((ret = EC_KEY_new()) == NULL) { ECerr(EC_F_D2I_ECPRIVATEKEY, 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) { ECerr(EC_F_D2I_ECPRIVATEKEY, 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 { ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY); goto err; } EC_POINT_clear_free(ret->pub_key); ret->pub_key = EC_POINT_new(ret->group); if (ret->pub_key == NULL) { ECerr(EC_F_D2I_ECPRIVATEKEY, 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)) { ECerr(EC_F_D2I_ECPRIVATEKEY, 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; return ret; err: if (a == NULL || *a != ret) EC_KEY_free(ret); EC_PRIVATEKEY_free(priv_key); return NULL; } int i2d_ECPrivateKey(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)) { ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER); goto err; } if ((priv_key = EC_PRIVATEKEY_new()) == NULL) { ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); goto err; } priv_key->version = a->version; privlen = EC_KEY_priv2buf(a, &priv); if (privlen == 0) { ECerr(EC_F_I2D_ECPRIVATEKEY, 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) { ECerr(EC_F_I2D_ECPRIVATEKEY, 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) { ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); goto err; } publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL); if (publen == 0) { ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); goto err; } priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT; ASN1_STRING_set0(priv_key->publicKey, pub, publen); pub = NULL; } if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) { ECerr(EC_F_I2D_ECPRIVATEKEY, 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(EC_KEY *a, unsigned char **out) { if (a == NULL) { ECerr(EC_F_I2D_ECPARAMETERS, 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) { ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER); return NULL; } if (a == NULL || *a == NULL) { if ((ret = EC_KEY_new()) == NULL) { ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE); return NULL; } } else ret = *a; if (!d2i_ECPKParameters(&ret->group, in, len)) { ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB); if (a == NULL || *a != ret) EC_KEY_free(ret); return NULL; } 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 */ ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER); return 0; } ret = *a; if (!EC_KEY_oct2key(ret, *in, len, NULL)) { ECerr(EC_F_O2I_ECPUBLICKEY, 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) { ECerr(EC_F_I2O_ECPUBLICKEY, 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) { ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE); return 0; } new_buffer = 1; } if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form, *out, buf_len, NULL)) { ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB); if (new_buffer) { OPENSSL_free(*out); *out = NULL; } return 0; } if (!new_buffer) *out += buf_len; return buf_len; } ASN1_SEQUENCE(ECDSA_SIG) = { ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM), ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM) } static_ASN1_SEQUENCE_END(ECDSA_SIG) DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG) DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG) IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG) ECDSA_SIG *ECDSA_SIG_new(void) { ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig)); if (sig == NULL) ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE); 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); } 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 *r) { int ret, i; ASN1_INTEGER bs; unsigned char buf[4]; const EC_GROUP *group; if (r == NULL) return 0; group = EC_KEY_get0_group(r); if (group == NULL) return 0; i = EC_GROUP_order_bits(group); if (i == 0) return 0; bs.length = (i + 7) / 8; bs.data = buf; bs.type = V_ASN1_INTEGER; /* If the top bit is set the asn1 encoding is 1 larger. */ buf[0] = 0xff; i = i2d_ASN1_INTEGER(&bs, NULL); i += i; /* r and s */ ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); if (ret < 0) return 0; return ret; }