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// Copyright 2020 The BoringSSL Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef OPENSSL_HEADER_CRYPTO_EC_INTERNAL_H
#define OPENSSL_HEADER_CRYPTO_EC_INTERNAL_H
#include <contrib/restricted/google/boringssl/include/openssl/ec.h>
#include <contrib/restricted/google/boringssl/include/openssl/span.h>
#include "../fipsmodule/ec/internal.h"
BSSL_NAMESPACE_BEGIN
// Parsing functions.
// ec_key_parse_curve_name behaves like |EC_KEY_parse_curve_name| but only
// supports the groups in |allowed_groups|. If no syntax errors were found but
// the group is unknown, it will fail with an error of |EC_R_UNKNOWN_GROUP|.
const EC_GROUP *ec_key_parse_curve_name(
CBS *cbs, bssl::Span<const EC_GROUP *const> allowed_groups);
// ec_key_parse_parameters behaves like |EC_KEY_parse_parameters| but only
// supports the groups in |allowed_groups|. If no syntax errors were found but
// the group is unknown, it will fail with an error of |EC_R_UNKNOWN_GROUP|.
const EC_GROUP *ec_key_parse_parameters(
CBS *cbs, bssl::Span<const EC_GROUP *const> allowed_groups);
// ec_key_parse_private_key behaves like |EC_KEY_parse_private_key| but only
// supports the groups in |allowed_groups|. If |group| is non-NULL,
// |allowed_groups| is ignored and instead only |group| is supported.
//
// TODO(crbug.com/boringssl/414361735): This should return a bssl::UniquePtr,
// but cannot until it is made C++ linkage.
EC_KEY *ec_key_parse_private_key(
CBS *cbs, const EC_GROUP *group,
bssl::Span<const EC_GROUP *const> allowed_groups);
// Hash-to-curve.
//
// Internal |EC_JACOBIAN| versions of the corresponding public APIs.
// ec_hash_to_curve_p256_xmd_sha256_sswu hashes |msg| to a point on |group| and
// writes the result to |out|, implementing the P256_XMD:SHA-256_SSWU_RO_ suite
// from RFC 9380. It returns one on success and zero on error.
OPENSSL_EXPORT int ec_hash_to_curve_p256_xmd_sha256_sswu(
const EC_GROUP *group, EC_JACOBIAN *out, const uint8_t *dst, size_t dst_len,
const uint8_t *msg, size_t msg_len);
// ec_hash_to_curve_p384_xmd_sha384_sswu hashes |msg| to a point on |group| and
// writes the result to |out|, implementing the P384_XMD:SHA-384_SSWU_RO_ suite
// from RFC 9380. It returns one on success and zero on error.
OPENSSL_EXPORT int ec_hash_to_curve_p384_xmd_sha384_sswu(
const EC_GROUP *group, EC_JACOBIAN *out, const uint8_t *dst, size_t dst_len,
const uint8_t *msg, size_t msg_len);
// ec_encode_to_curve_p256_xmd_sha256_sswu hashes |msg| to a point on |group|
// and writes the result to |out|, implementing the P256_XMD:SHA-256_SSWU_NU_
// suite from RFC 9380. It returns one on success and zero on error.
OPENSSL_EXPORT int ec_encode_to_curve_p256_xmd_sha256_sswu(
const EC_GROUP *group, EC_JACOBIAN *out, const uint8_t *dst, size_t dst_len,
const uint8_t *msg, size_t msg_len);
// ec_encode_to_curve_p384_xmd_sha384_sswu hashes |msg| to a point on |group|
// and writes the result to |out|, implementing the P384_XMD:SHA-384_SSWU_NU_
// suite from RFC 9380. It returns one on success and zero on error.
OPENSSL_EXPORT int ec_encode_to_curve_p384_xmd_sha384_sswu(
const EC_GROUP *group, EC_JACOBIAN *out, const uint8_t *dst, size_t dst_len,
const uint8_t *msg, size_t msg_len);
// ec_hash_to_scalar_p384_xmd_sha384 hashes |msg| to a scalar on |group|
// and writes the result to |out|, using the hash_to_field operation from the
// P384_XMD:SHA-384_SSWU_RO_ suite from RFC 9380, but generating a value modulo
// the group order rather than a field element.
OPENSSL_EXPORT int ec_hash_to_scalar_p384_xmd_sha384(
const EC_GROUP *group, EC_SCALAR *out, const uint8_t *dst, size_t dst_len,
const uint8_t *msg, size_t msg_len);
// ec_hash_to_curve_p384_xmd_sha512_sswu_draft07 hashes |msg| to a point on
// |group| and writes the result to |out|, implementing the
// P384_XMD:SHA-512_SSWU_RO_ suite from draft-irtf-cfrg-hash-to-curve-07. It
// returns one on success and zero on error.
//
// TODO(https://crbug.com/1414562): Migrate this to the final version.
OPENSSL_EXPORT int ec_hash_to_curve_p384_xmd_sha512_sswu_draft07(
const EC_GROUP *group, EC_JACOBIAN *out, const uint8_t *dst, size_t dst_len,
const uint8_t *msg, size_t msg_len);
// ec_hash_to_scalar_p384_xmd_sha512_draft07 hashes |msg| to a scalar on |group|
// and writes the result to |out|, using the hash_to_field operation from the
// P384_XMD:SHA-512_SSWU_RO_ suite from draft-irtf-cfrg-hash-to-curve-07, but
// generating a value modulo the group order rather than a field element.
//
// TODO(https://crbug.com/1414562): Migrate this to the final version.
OPENSSL_EXPORT int ec_hash_to_scalar_p384_xmd_sha512_draft07(
const EC_GROUP *group, EC_SCALAR *out, const uint8_t *dst, size_t dst_len,
const uint8_t *msg, size_t msg_len);
BSSL_NAMESPACE_END
#endif // OPENSSL_HEADER_CRYPTO_EC_INTERNAL_H
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