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Simple HTTP client with HTTP/1.1, HTTP/2, and HTTP/3 support

Security advisory: This version has known vulnerabilities. View advisories
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hackney c_src boringssl include openssl kdf.h
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c_src/boringssl/include/openssl/kdf.h 

// Copyright 2022 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_KDF_H

#define OPENSSL_HEADER_KDF_H



#include <openssl/base.h>   // IWYU pragma: export



#if defined(__cplusplus)

extern "C" {

#endif





// KDF support for EVP.





// HKDF-specific functions.

//

// The following functions are provided for OpenSSL compatibility. Prefer the

// HKDF functions in <openssl/hkdf.h>. In each, |ctx| must be created with

// |EVP_PKEY_CTX_new_id| with |EVP_PKEY_HKDF| and then initialized with

// |EVP_PKEY_derive_init|.



// EVP_PKEY_HKDEF_MODE_* define "modes" for use with |EVP_PKEY_CTX_hkdf_mode|.

// The misspelling of "HKDF" as "HKDEF" is intentional for OpenSSL

// compatibility.

#define EVP_PKEY_HKDEF_MODE_EXTRACT_AND_EXPAND 0

#define EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY 1

#define EVP_PKEY_HKDEF_MODE_EXPAND_ONLY 2



// EVP_PKEY_CTX_hkdf_mode configures which HKDF operation to run. It returns one

// on success and zero on error. |mode| must be one of |EVP_PKEY_HKDEF_MODE_*|.

// By default, the mode is |EVP_PKEY_HKDEF_MODE_EXTRACT_AND_EXPAND|.

//

// If |mode| is |EVP_PKEY_HKDEF_MODE_EXTRACT_AND_EXPAND| or

// |EVP_PKEY_HKDEF_MODE_EXPAND_ONLY|, the output is variable-length.

// |EVP_PKEY_derive| uses the size of the output buffer as the output length for

// HKDF-Expand.

//

// WARNING: Although this API calls it a "mode", HKDF-Extract and HKDF-Expand

// are distinct operations with distinct inputs and distinct kinds of keys.

// Callers should not pass input secrets for one operation into the other.

OPENSSL_EXPORT int EVP_PKEY_CTX_hkdf_mode(EVP_PKEY_CTX *ctx, int mode);



// EVP_PKEY_CTX_set_hkdf_md sets |md| as the digest to use with HKDF. It returns

// one on success and zero on error.

OPENSSL_EXPORT int EVP_PKEY_CTX_set_hkdf_md(EVP_PKEY_CTX *ctx,

                                            const EVP_MD *md);



// EVP_PKEY_CTX_set1_hkdf_key configures HKDF to use |key_len| bytes from |key|

// as the "key", described below. It returns one on success and zero on error.

//

// Which input is the key depends on the "mode" (see |EVP_PKEY_CTX_hkdf_mode|).

// If |EVP_PKEY_HKDEF_MODE_EXTRACT_AND_EXPAND| or

// |EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY|, this function specifies the input keying

// material (IKM) for HKDF-Extract. If |EVP_PKEY_HKDEF_MODE_EXPAND_ONLY|, it

// instead specifies the pseudorandom key (PRK) for HKDF-Expand.

OPENSSL_EXPORT int EVP_PKEY_CTX_set1_hkdf_key(EVP_PKEY_CTX *ctx,

                                              const uint8_t *key,

                                              size_t key_len);



// EVP_PKEY_CTX_set1_hkdf_salt configures HKDF to use |salt_len| bytes from

// |salt| as the salt parameter to HKDF-Extract. It returns one on success and

// zero on error. If performing HKDF-Expand only, this parameter is ignored.

OPENSSL_EXPORT int EVP_PKEY_CTX_set1_hkdf_salt(EVP_PKEY_CTX *ctx,

                                               const uint8_t *salt,

                                               size_t salt_len);



// EVP_PKEY_CTX_add1_hkdf_info appends |info_len| bytes from |info| to the info

// parameter used with HKDF-Expand. It returns one on success and zero on error.

// If performing HKDF-Extract only, this parameter is ignored.

OPENSSL_EXPORT int EVP_PKEY_CTX_add1_hkdf_info(EVP_PKEY_CTX *ctx,

                                               const uint8_t *info,

                                               size_t info_len);





#if defined(__cplusplus)

}  // extern C

#endif



#endif  // OPENSSL_HEADER_KDF_H