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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 hkdf.h
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c_src/boringssl/include/openssl/hkdf.h 

// Copyright 2014 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_HKDF_H

#define OPENSSL_HEADER_HKDF_H



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



#if defined(__cplusplus)

extern "C" {

#endif





// HKDF.





// HKDF computes HKDF (as specified by RFC 5869) of initial keying material

// |secret| with |salt| and |info| using |digest|, and outputs |out_len| bytes

// to |out_key|. It returns one on success and zero on error.

//

// HKDF is an Extract-and-Expand algorithm. It does not do any key stretching,

// and as such, is not suited to be used alone to generate a key from a

// password.

OPENSSL_EXPORT int HKDF(uint8_t *out_key, size_t out_len, const EVP_MD *digest,

                        const uint8_t *secret, size_t secret_len,

                        const uint8_t *salt, size_t salt_len,

                        const uint8_t *info, size_t info_len);



// HKDF_extract computes a HKDF PRK (as specified by RFC 5869) from initial

// keying material |secret| and salt |salt| using |digest|, and outputs

// |out_len| bytes to |out_key|. The maximum output size is |EVP_MAX_MD_SIZE|.

// It returns one on success and zero on error.

//

// WARNING: This function orders the inputs differently from RFC 5869

// specification. Double-check which parameter is the secret/IKM and which is

// the salt when using.

OPENSSL_EXPORT int HKDF_extract(uint8_t *out_key, size_t *out_len,

                                const EVP_MD *digest, const uint8_t *secret,

                                size_t secret_len, const uint8_t *salt,

                                size_t salt_len);



// HKDF_expand computes a HKDF OKM (as specified by RFC 5869) of length

// |out_len| from the PRK |prk| and info |info| using |digest|, and outputs

// the result to |out_key|. It returns one on success and zero on error.

OPENSSL_EXPORT int HKDF_expand(uint8_t *out_key, size_t out_len,

                               const EVP_MD *digest, const uint8_t *prk,

                               size_t prk_len, const uint8_t *info,

                               size_t info_len);





#if defined(__cplusplus)

}  // extern C

#endif



#define HKDF_R_OUTPUT_TOO_LARGE 100



#endif  // OPENSSL_HEADER_HKDF_H