/* Copyright (c) 2018, Google Inc.

 *

 * Permission to use, copy, modify, and/or distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY

 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#ifndef OPENSSL_HEADER_CHACHA_INTERNAL

#define OPENSSL_HEADER_CHACHA_INTERNAL

#include <openssl/base.h>

#include "../internal.h"

#if defined(__cplusplus)

extern "C" {

#endif

// CRYPTO_hchacha20 computes the HChaCha20 function, which should only be used

// as part of XChaCha20.

void CRYPTO_hchacha20(uint8_t out[32], const uint8_t key[32],

                      const uint8_t nonce[16]);

#if !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86)

#define CHACHA20_ASM_NOHW

#define CHACHA20_ASM_SSSE3

OPENSSL_INLINE int ChaCha20_ctr32_ssse3_capable(size_t len) {

  // Unlike the x86_64 version, the x86 SSSE3 routine runs for all non-zero

  // lengths.

  return len > 0 && CRYPTO_is_SSSE3_capable() && CRYPTO_is_FXSR_capable();

}

void ChaCha20_ctr32_ssse3(uint8_t *out, const uint8_t *in, size_t in_len,

                          const uint32_t key[8], const uint32_t counter[4]);

#elif !defined(OPENSSL_NO_ASM) && \

    (defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64))

#define CHACHA20_ASM_NOHW

#define CHACHA20_ASM_NEON

OPENSSL_INLINE int ChaCha20_ctr32_neon_capable(size_t len) {

  return len >= 192 && CRYPTO_is_NEON_capable();

}

void ChaCha20_ctr32_neon(uint8_t *out, const uint8_t *in, size_t in_len,

                         const uint32_t key[8], const uint32_t counter[4]);

#elif !defined(OPENSSL_NO_ASM) && defined(OPENSSL_X86_64)

#define CHACHA20_ASM_NOHW

#define CHACHA20_ASM_AVX2

OPENSSL_INLINE int ChaCha20_ctr32_avx2_capable(size_t len) {

  return len > 128 && CRYPTO_is_AVX2_capable();

}

Unexecuted instantiation: e_chacha20poly1305.c:ChaCha20_ctr32_avx2_capable

Unexecuted instantiation: chacha.c:ChaCha20_ctr32_avx2_capable

void ChaCha20_ctr32_avx2(uint8_t *out, const uint8_t *in, size_t in_len,

                         const uint32_t key[8], const uint32_t counter[4]);

#define CHACHA20_ASM_SSSE3_4X

OPENSSL_INLINE int ChaCha20_ctr32_ssse3_4x_capable(size_t len) {

  int capable = len > 128 && CRYPTO_is_SSSE3_capable();

  int faster = len > 192 || !CRYPTO_cpu_perf_is_like_silvermont();

  return capable && faster;

}

Unexecuted instantiation: e_chacha20poly1305.c:ChaCha20_ctr32_ssse3_4x_capable

Unexecuted instantiation: chacha.c:ChaCha20_ctr32_ssse3_4x_capable

void ChaCha20_ctr32_ssse3_4x(uint8_t *out, const uint8_t *in, size_t in_len,

                             const uint32_t key[8], const uint32_t counter[4]);

#define CHACHA20_ASM_SSSE3

OPENSSL_INLINE int ChaCha20_ctr32_ssse3_capable(size_t len) {

  return len > 128 && CRYPTO_is_SSSE3_capable();

}

Unexecuted instantiation: e_chacha20poly1305.c:ChaCha20_ctr32_ssse3_capable

Unexecuted instantiation: chacha.c:ChaCha20_ctr32_ssse3_capable

void ChaCha20_ctr32_ssse3(uint8_t *out, const uint8_t *in, size_t in_len,

                          const uint32_t key[8], const uint32_t counter[4]);

#endif

#if defined(CHACHA20_ASM_NOHW)

// ChaCha20_ctr32_nohw encrypts |in_len| bytes from |in| and writes the result

// to |out|. If |in| and |out| alias, they must be equal. |in_len| may not be

// zero.

//

// |counter[0]| is the initial 32-bit block counter, and the remainder is the

// 96-bit nonce. If the counter overflows, the output is undefined. The function

// will produce output, but the output may vary by machine and may not be

// self-consistent. (On some architectures, the assembly implements a mix of

// 64-bit and 32-bit counters.)

void ChaCha20_ctr32_nohw(uint8_t *out, const uint8_t *in, size_t in_len,

                         const uint32_t key[8], const uint32_t counter[4]);

#endif

#if defined(__cplusplus)

}  // extern C

#endif

#endif  // OPENSSL_HEADER_CHACHA_INTERNAL