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// 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_CTRDRBG_H
#define OPENSSL_HEADER_CTRDRBG_H
#include <contrib/restricted/google/boringssl/include/openssl/base.h> // IWYU pragma: export
#if defined(__cplusplus)
extern "C" {
#endif
// FIPS pseudo-random number generator.
// CTR-DRBG state objects.
//
// CTR_DRBG_STATE contains the state of a FIPS AES-CTR-based pseudo-random
// number generator. If BoringSSL was built in FIPS mode then this is a FIPS
// Approved algorithm. BoringSSL supports CTR-DRBG both with, and without, a
// derivation function.
// CTR_DRBG_MIN_ENTROPY_LEN is the minimum number of bytes of input entropy
// when using a derivation function. See SP 800-90Ar1, table 3.
#define CTR_DRBG_MIN_ENTROPY_LEN 32
// CTR_DRBG_MAX_ENTROPY_LEN is the maximum number of bytes of input entropy
// when using a derivation function. This is an implementation limitation.
#define CTR_DRBG_MAX_ENTROPY_LEN 64
// CTR_DRBG_ENTROPY_LEN is a fixed amount of entropy required when not using a
// derivation function.
#define CTR_DRBG_ENTROPY_LEN 48
// The length of a seed, when using a derivation function. See SP 800-90Ar1,
// table 3.
#define CTR_DRBG_SEED_LEN (32 + CTR_DRBG_NONCE_LEN)
// CTR_DRBG_NONCE_LEN is the number of bytes of input nonce. This only applies
// when using a derivation function.
#define CTR_DRBG_NONCE_LEN 16
// CTR_DRBG_MAX_GENERATE_LENGTH is the maximum number of bytes that can be
// generated in a single call to |CTR_DRBG_generate|.
#define CTR_DRBG_MAX_GENERATE_LENGTH 65536
// CTR_DRBG_new returns an initialized |CTR_DRBG_STATE|, or NULL if either
// allocation failed or if |personalization_len| is invalid. This DRBG will not
// use a derivation function.
OPENSSL_EXPORT CTR_DRBG_STATE *CTR_DRBG_new(
const uint8_t entropy[CTR_DRBG_ENTROPY_LEN], const uint8_t *personalization,
size_t personalization_len);
// CTR_DRBG_new_df returns an initialized |CTR_DRBG_STATE|, or NULL if either
// allocation failed or if an argument is invalid. This DRBG will use a
// derivation function.
OPENSSL_EXPORT CTR_DRBG_STATE *CTR_DRBG_new_df(
const uint8_t *entropy, size_t entropy_len,
const uint8_t nonce[CTR_DRBG_NONCE_LEN], const uint8_t *personalization,
size_t personalization_len);
// CTR_DRBG_free frees |state| if non-NULL, or else does nothing.
OPENSSL_EXPORT void CTR_DRBG_free(CTR_DRBG_STATE *state);
// CTR_DRBG_reseed reseeds |drbg| given |CTR_DRBG_ENTROPY_LEN| bytes of entropy
// in |entropy| and, optionally, up to |CTR_DRBG_SEED_LEN| bytes of
// additional data. It returns one on success or zero on error.
OPENSSL_EXPORT int CTR_DRBG_reseed(CTR_DRBG_STATE *drbg,
const uint8_t entropy[CTR_DRBG_ENTROPY_LEN],
const uint8_t *additional_data,
size_t additional_data_len);
// CTR_DRBG_reseed_ex acts like `CTR_DRBG_reseed` but with variable-length
// entropy input, up to |CTR_DRBG_MAX_ENTROPY_LEN|.
OPENSSL_EXPORT int CTR_DRBG_reseed_ex(CTR_DRBG_STATE *drbg,
const uint8_t *entropy,
size_t entropy_len,
const uint8_t *additional_data,
size_t additional_data_len);
// CTR_DRBG_generate processes to up |CTR_DRBG_ENTROPY_LEN| bytes of additional
// data (if any) and then writes |out_len| random bytes to |out|, where
// |out_len| <= |CTR_DRBG_MAX_GENERATE_LENGTH|. It returns one on success or
// zero on error.
OPENSSL_EXPORT int CTR_DRBG_generate(CTR_DRBG_STATE *drbg, uint8_t *out,
size_t out_len,
const uint8_t *additional_data,
size_t additional_data_len);
// CTR_DRBG_clear zeroises the state of |drbg|.
OPENSSL_EXPORT void CTR_DRBG_clear(CTR_DRBG_STATE *drbg);
#if defined(__cplusplus)
} // extern C
extern "C++" {
BSSL_NAMESPACE_BEGIN
BORINGSSL_MAKE_DELETER(CTR_DRBG_STATE, CTR_DRBG_free)
BSSL_NAMESPACE_END
} // extern C++
#endif
#endif // OPENSSL_HEADER_CTRDRBG_H
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