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2025-06-25 09:00:00 +01:00

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C

/* mlkem.h
*
* Copyright (C) 2006-2025 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/*!
\file wolfssl/wolfcrypt/mlkem.h
*/
#ifndef WOLF_CRYPT_MLKEM_H
#define WOLF_CRYPT_MLKEM_H
#include <wolfssl/wolfcrypt/types.h>
#include <wolfssl/wolfcrypt/random.h>
#ifdef WOLFSSL_HAVE_MLKEM
/* Number of co-efficients in polynomial. */
#define MLKEM_N 256
/* Define algorithm type when not excluded. */
#ifndef WOLFSSL_NO_ML_KEM
#if !defined(WOLFSSL_NO_ML_KEM_512)
#define WOLFSSL_WC_ML_KEM_512
#endif
#if !defined(WOLFSSL_NO_ML_KEM_768)
#define WOLFSSL_WC_ML_KEM_768
#endif
#if !defined(WOLFSSL_NO_ML_KEM_1024)
#define WOLFSSL_WC_ML_KEM_1024
#endif
#if !defined(WOLFSSL_WC_ML_KEM_512) && !defined(WOLFSSL_WC_ML_KEM_768) && \
!defined(WOLFSSL_WC_ML_KEM_1024)
#error "No ML-KEM key size chosen."
#endif
#endif
#ifdef WOLFSSL_MLKEM_KYBER
#ifndef WOLFSSL_NO_KYBER512
#define WOLFSSL_KYBER512
#define WOLFSSL_WC_ML_KEM_512
#endif
#ifndef WOLFSSL_NO_KYBER768
#define WOLFSSL_KYBER768
#define WOLFSSL_WC_ML_KEM_768
#endif
#ifndef WOLFSSL_NO_KYBER1024
#define WOLFSSL_KYBER1024
#define WOLFSSL_WC_ML_KEM_1024
#endif
#if !defined(WOLFSSL_KYBER512) && !defined(WOLFSSL_KYBER768) && \
!defined(WOLFSSL_KYBER1024)
#error "No Kyber key size chosen."
#endif
#endif
/* Size of a polynomial vector based on dimensions. */
#define MLKEM_POLY_VEC_SZ(k) ((k) * WC_ML_KEM_POLY_SIZE)
/* Size of a compressed polynomial based on bits per coefficient. */
#define MLKEM_POLY_COMPRESSED_SZ(b) ((b) * (MLKEM_N / 8))
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define MLKEM_POLY_VEC_COMPRESSED_SZ(k, b) ((k) * ((b) * (MLKEM_N / 8)))
#ifdef WOLFSSL_WC_ML_KEM_512
#define WC_ML_KEM_512_K 2
/* Size of a polynomial vector. */
#define WC_ML_KEM_512_POLY_VEC_SZ MLKEM_POLY_VEC_SZ(WC_ML_KEM_512_K)
/* Size of a compressed polynomial based on bits per coefficient. */
#define WC_ML_KEM_512_POLY_COMPRESSED_SZ MLKEM_POLY_COMPRESSED_SZ(4)
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define WC_ML_KEM_512_POLY_VEC_COMPRESSED_SZ \
MLKEM_POLY_VEC_COMPRESSED_SZ(WC_ML_KEM_512_K, 10)
/* Public key size. */
#define WC_ML_KEM_512_PUBLIC_KEY_SIZE \
(WC_ML_KEM_512_POLY_VEC_SZ + WC_ML_KEM_SYM_SZ)
/* Private key size. */
#define WC_ML_KEM_512_PRIVATE_KEY_SIZE \
(WC_ML_KEM_512_POLY_VEC_SZ + WC_ML_KEM_512_PUBLIC_KEY_SIZE + \
2 * WC_ML_KEM_SYM_SZ)
/* Cipher text size. */
#define WC_ML_KEM_512_CIPHER_TEXT_SIZE \
(WC_ML_KEM_512_POLY_VEC_COMPRESSED_SZ + WC_ML_KEM_512_POLY_COMPRESSED_SZ)
#endif
#ifdef WOLFSSL_WC_ML_KEM_768
#define WC_ML_KEM_768_K 3
/* Size of a polynomial vector. */
#define WC_ML_KEM_768_POLY_VEC_SZ MLKEM_POLY_VEC_SZ(WC_ML_KEM_768_K)
/* Size of a compressed polynomial based on bits per coefficient. */
#define WC_ML_KEM_768_POLY_COMPRESSED_SZ MLKEM_POLY_COMPRESSED_SZ(4)
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define WC_ML_KEM_768_POLY_VEC_COMPRESSED_SZ \
MLKEM_POLY_VEC_COMPRESSED_SZ(WC_ML_KEM_768_K, 10)
/* Public key size. */
#define WC_ML_KEM_768_PUBLIC_KEY_SIZE \
(WC_ML_KEM_768_POLY_VEC_SZ + WC_ML_KEM_SYM_SZ)
/* Private key size. */
#define WC_ML_KEM_768_PRIVATE_KEY_SIZE \
(WC_ML_KEM_768_POLY_VEC_SZ + WC_ML_KEM_768_PUBLIC_KEY_SIZE + \
2 * WC_ML_KEM_SYM_SZ)
/* Cipher text size. */
#define WC_ML_KEM_768_CIPHER_TEXT_SIZE \
(WC_ML_KEM_768_POLY_VEC_COMPRESSED_SZ + WC_ML_KEM_768_POLY_COMPRESSED_SZ)
#endif
#ifdef WOLFSSL_WC_ML_KEM_1024
#define WC_ML_KEM_1024_K 4
/* Size of a polynomial vector. */
#define WC_ML_KEM_1024_POLY_VEC_SZ MLKEM_POLY_VEC_SZ(WC_ML_KEM_1024_K)
/* Size of a compressed polynomial based on bits per coefficient. */
#define WC_ML_KEM_1024_POLY_COMPRESSED_SZ MLKEM_POLY_COMPRESSED_SZ(5)
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define WC_ML_KEM_1024_POLY_VEC_COMPRESSED_SZ \
MLKEM_POLY_VEC_COMPRESSED_SZ(WC_ML_KEM_1024_K, 11)
/* Public key size. */
#define WC_ML_KEM_1024_PUBLIC_KEY_SIZE \
(WC_ML_KEM_1024_POLY_VEC_SZ + WC_ML_KEM_SYM_SZ)
/* Private key size. */
#define WC_ML_KEM_1024_PRIVATE_KEY_SIZE \
(WC_ML_KEM_1024_POLY_VEC_SZ + WC_ML_KEM_1024_PUBLIC_KEY_SIZE + \
2 * WC_ML_KEM_SYM_SZ)
/* Cipher text size. */
#define WC_ML_KEM_1024_CIPHER_TEXT_SIZE \
(WC_ML_KEM_1024_POLY_VEC_COMPRESSED_SZ + WC_ML_KEM_1024_POLY_COMPRESSED_SZ)
#endif
#ifndef WC_ML_KEM_MAX_K
#ifdef WOLFSSL_WC_ML_KEM_1024
#define WC_ML_KEM_MAX_K WC_ML_KEM_1024_K
#define WC_ML_KEM_MAX_PRIVATE_KEY_SIZE WC_ML_KEM_1024_PRIVATE_KEY_SIZE
#define WC_ML_KEM_MAX_PUBLIC_KEY_SIZE WC_ML_KEM_1024_PUBLIC_KEY_SIZE
#define WC_ML_KEM_MAX_CIPHER_TEXT_SIZE WC_ML_KEM_1024_CIPHER_TEXT_SIZE
#elif defined(WOLFSSL_WC_ML_KEM_768)
#define WC_ML_KEM_MAX_K WC_ML_KEM_768_K
#define WC_ML_KEM_MAX_PRIVATE_KEY_SIZE WC_ML_KEM_768_PRIVATE_KEY_SIZE
#define WC_ML_KEM_MAX_PUBLIC_KEY_SIZE WC_ML_KEM_768_PUBLIC_KEY_SIZE
#define WC_ML_KEM_MAX_CIPHER_TEXT_SIZE WC_ML_KEM_768_CIPHER_TEXT_SIZE
#elif defined(WOLFSSL_WC_ML_KEM_512)
#define WC_ML_KEM_MAX_K WC_ML_KEM_512_K
#define WC_ML_KEM_MAX_PRIVATE_KEY_SIZE WC_ML_KEM_512_PRIVATE_KEY_SIZE
#define WC_ML_KEM_MAX_PUBLIC_KEY_SIZE WC_ML_KEM_512_PUBLIC_KEY_SIZE
#define WC_ML_KEM_MAX_CIPHER_TEXT_SIZE WC_ML_KEM_512_CIPHER_TEXT_SIZE
#endif
#endif /* WC_ML_KEM_MAX_K */
#define KYBER_N MLKEM_N
/* Size of a polynomial vector based on dimensions. */
#define KYBER_POLY_VEC_SZ(k) ((k) * KYBER_POLY_SIZE)
/* Size of a compressed polynomial based on bits per coefficient. */
#define KYBER_POLY_COMPRESSED_SZ(b) ((b) * (KYBER_N / 8))
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define KYBER_POLY_VEC_COMPRESSED_SZ(k, b) ((k) * ((b) * (KYBER_N / 8)))
/* Kyber-512 parameters */
/* Number of polynomials in a vector and vectors in a matrix. */
#define KYBER512_K 2
/* Size of a polynomial vector. */
#define KYBER512_POLY_VEC_SZ KYBER_POLY_VEC_SZ(KYBER512_K)
/* Size of a compressed polynomial based on bits per coefficient. */
#define KYBER512_POLY_COMPRESSED_SZ KYBER_POLY_COMPRESSED_SZ(4)
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define KYBER512_POLY_VEC_COMPRESSED_SZ \
KYBER_POLY_VEC_COMPRESSED_SZ(KYBER512_K, 10)
/* Public key size. */
#define KYBER512_PUBLIC_KEY_SIZE \
(KYBER512_POLY_VEC_SZ + KYBER_SYM_SZ)
/* Private key size. */
#define KYBER512_PRIVATE_KEY_SIZE \
(KYBER512_POLY_VEC_SZ + KYBER512_PUBLIC_KEY_SIZE + 2 * KYBER_SYM_SZ)
/* Cipher text size. */
#define KYBER512_CIPHER_TEXT_SIZE \
(KYBER512_POLY_VEC_COMPRESSED_SZ + KYBER512_POLY_COMPRESSED_SZ)
/* Kyber-768 parameters */
/* Number of polynomials in a vector and vectors in a matrix. */
#define KYBER768_K 3
/* Size of a polynomial vector. */
#define KYBER768_POLY_VEC_SZ KYBER_POLY_VEC_SZ(KYBER768_K)
/* Size of a compressed polynomial based on bits per coefficient. */
#define KYBER768_POLY_COMPRESSED_SZ KYBER_POLY_COMPRESSED_SZ(4)
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define KYBER768_POLY_VEC_COMPRESSED_SZ \
KYBER_POLY_VEC_COMPRESSED_SZ(KYBER768_K, 10)
/* Public key size. */
#define KYBER768_PUBLIC_KEY_SIZE \
(KYBER768_POLY_VEC_SZ + KYBER_SYM_SZ)
/* Private key size. */
#define KYBER768_PRIVATE_KEY_SIZE \
(KYBER768_POLY_VEC_SZ + KYBER768_PUBLIC_KEY_SIZE + 2 * KYBER_SYM_SZ)
/* Cipher text size. */
#define KYBER768_CIPHER_TEXT_SIZE \
(KYBER768_POLY_VEC_COMPRESSED_SZ + KYBER768_POLY_COMPRESSED_SZ)
/* Kyber-1024 parameters */
/* Number of polynomials in a vector and vectors in a matrix. */
#define KYBER1024_K 4
/* Size of a polynomial vector. */
#define KYBER1024_POLY_VEC_SZ KYBER_POLY_VEC_SZ(KYBER1024_K)
/* Size of a compressed polynomial based on bits per coefficient. */
#define KYBER1024_POLY_COMPRESSED_SZ KYBER_POLY_COMPRESSED_SZ(5)
/* Size of a compressed vector polynomial based on dimensions and bits per
* coefficient. */
#define KYBER1024_POLY_VEC_COMPRESSED_SZ \
KYBER_POLY_VEC_COMPRESSED_SZ(KYBER1024_K, 11)
/* Public key size. */
#define KYBER1024_PUBLIC_KEY_SIZE \
(KYBER1024_POLY_VEC_SZ + KYBER_SYM_SZ)
/* Private key size. */
#define KYBER1024_PRIVATE_KEY_SIZE \
(KYBER1024_POLY_VEC_SZ + KYBER1024_PUBLIC_KEY_SIZE + 2 * KYBER_SYM_SZ)
/* Cipher text size. */
#define KYBER1024_CIPHER_TEXT_SIZE \
(KYBER1024_POLY_VEC_COMPRESSED_SZ + KYBER1024_POLY_COMPRESSED_SZ)
/* Maximum dimensions and sizes of supported key types. */
#ifdef WOLFSSL_KYBER1024
#define KYBER_MAX_K KYBER1024_K
#define KYBER_MAX_PRIVATE_KEY_SIZE KYBER1024_PRIVATE_KEY_SIZE
#define KYBER_MAX_PUBLIC_KEY_SIZE KYBER1024_PUBLIC_KEY_SIZE
#define KYBER_MAX_CIPHER_TEXT_SIZE KYBER1024_CIPHER_TEXT_SIZE
#elif defined(WOLFSSL_KYBER768)
#define KYBER_MAX_K KYBER768_K
#define KYBER_MAX_PRIVATE_KEY_SIZE KYBER768_PRIVATE_KEY_SIZE
#define KYBER_MAX_PUBLIC_KEY_SIZE KYBER768_PUBLIC_KEY_SIZE
#define KYBER_MAX_CIPHER_TEXT_SIZE KYBER768_CIPHER_TEXT_SIZE
#elif defined(WOLFSSL_KYBER512)
#define KYBER_MAX_K KYBER512_K
#define KYBER_MAX_PRIVATE_KEY_SIZE KYBER512_PRIVATE_KEY_SIZE
#define KYBER_MAX_PUBLIC_KEY_SIZE KYBER512_PUBLIC_KEY_SIZE
#define KYBER_MAX_CIPHER_TEXT_SIZE KYBER512_CIPHER_TEXT_SIZE
#endif
#define KYBER_SYM_SZ WC_ML_KEM_SYM_SZ
#define KYBER_SS_SZ WC_ML_KEM_SS_SZ
#define KYBER_MAKEKEY_RAND_SZ WC_ML_KEM_MAKEKEY_RAND_SZ
#define KYBER_ENC_RAND_SZ WC_ML_KEM_ENC_RAND_SZ
#define KYBER_POLY_SIZE WC_ML_KEM_POLY_SIZE
enum {
/* Types of Kyber keys. */
WC_ML_KEM_512 = 0,
WC_ML_KEM_768 = 1,
WC_ML_KEM_1024 = 2,
MLKEM_KYBER = 0x10,
KYBER512 = 0 | MLKEM_KYBER,
KYBER768 = 1 | MLKEM_KYBER,
KYBER1024 = 2 | MLKEM_KYBER,
KYBER_LEVEL1 = KYBER512,
KYBER_LEVEL3 = KYBER768,
KYBER_LEVEL5 = KYBER1024,
/* Symmetric data size. */
WC_ML_KEM_SYM_SZ = 32,
/* Shared secret size. */
WC_ML_KEM_SS_SZ = 32,
/* Size of random required for making a key. */
WC_ML_KEM_MAKEKEY_RAND_SZ = 2 * WC_ML_KEM_SYM_SZ,
/* Size of random required for encapsulation. */
WC_ML_KEM_ENC_RAND_SZ = WC_ML_KEM_SYM_SZ,
/* Encoded polynomial size. */
WC_ML_KEM_POLY_SIZE = 384,
};
/* Different structures for different implementations. */
typedef struct MlKemKey MlKemKey;
#ifdef __cplusplus
extern "C" {
#endif
WOLFSSL_API int wc_MlKemKey_Init(MlKemKey* key, int type, void* heap,
int devId);
WOLFSSL_API int wc_MlKemKey_Free(MlKemKey* key);
WOLFSSL_API int wc_MlKemKey_MakeKey(MlKemKey* key, WC_RNG* rng);
WOLFSSL_API int wc_MlKemKey_MakeKeyWithRandom(MlKemKey* key,
const unsigned char* rand, int len);
WOLFSSL_API int wc_MlKemKey_CipherTextSize(MlKemKey* key, word32* len);
WOLFSSL_API int wc_MlKemKey_SharedSecretSize(MlKemKey* key, word32* len);
WOLFSSL_API int wc_MlKemKey_Encapsulate(MlKemKey* key, unsigned char* ct,
unsigned char* ss, WC_RNG* rng);
WOLFSSL_API int wc_MlKemKey_EncapsulateWithRandom(MlKemKey* key,
unsigned char* ct, unsigned char* ss, const unsigned char* rand, int len);
WOLFSSL_API int wc_MlKemKey_Decapsulate(MlKemKey* key, unsigned char* ss,
const unsigned char* ct, word32 len);
WOLFSSL_API int wc_MlKemKey_DecodePrivateKey(MlKemKey* key,
const unsigned char* in, word32 len);
WOLFSSL_API int wc_MlKemKey_DecodePublicKey(MlKemKey* key,
const unsigned char* in, word32 len);
WOLFSSL_API int wc_MlKemKey_PrivateKeySize(MlKemKey* key, word32* len);
WOLFSSL_API int wc_MlKemKey_PublicKeySize(MlKemKey* key, word32* len);
WOLFSSL_API int wc_MlKemKey_EncodePrivateKey(MlKemKey* key, unsigned char* out,
word32 len);
WOLFSSL_API int wc_MlKemKey_EncodePublicKey(MlKemKey* key, unsigned char* out,
word32 len);
#define KyberKey MlKemKey
#define wc_KyberKey_Init(type, key, heap, devId) \
wc_MlKemKey_Init(key, type, heap, devId)
#define wc_KyberKey_Free wc_MlKemKey_Free
#define wc_KyberKey_MakeKey wc_MlKemKey_MakeKey
#define wc_KyberKey_MakeKeyWithRandom wc_MlKemKey_MakeKeyWithRandom
#define wc_KyberKey_CipherTextSize wc_MlKemKey_CipherTextSize
#define wc_KyberKey_SharedSecretSize wc_MlKemKey_SharedSecretSize
#define wc_KyberKey_Encapsulate wc_MlKemKey_Encapsulate
#define wc_KyberKey_EncapsulateWithRandom wc_MlKemKey_EncapsulateWithRandom
#define wc_KyberKey_Decapsulate wc_MlKemKey_Decapsulate
#define wc_KyberKey_DecodePrivateKey wc_MlKemKey_DecodePrivateKey
#define wc_KyberKey_DecodePublicKey wc_MlKemKey_DecodePublicKey
#define wc_KyberKey_PrivateKeySize wc_MlKemKey_PrivateKeySize
#define wc_KyberKey_PublicKeySize wc_MlKemKey_PublicKeySize
#define wc_KyberKey_EncodePrivateKey wc_MlKemKey_EncodePrivateKey
#define wc_KyberKey_EncodePublicKey wc_MlKemKey_EncodePublicKey
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* WOLFSSL_HAVE_MLKEM */
#endif /* WOLF_CRYPT_MLKEM_H */