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/*
* Ouroboros - Copyright (C) 2016 - 2024
*
* Cryptography
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#ifndef OUROBOROS_LIB_CRYPT_H
#define OUROBOROS_LIB_CRYPT_H
#include <ouroboros/shm_du_buff.h>
#include <ouroboros/utils.h>
#include <assert.h>
#define IVSZ 16
#define SYMMKEYSZ 32
#define MAX_HASH_SIZE 64 /* SHA-512/BLAKE2b max */
#define KEX_ALGO_BUFSZ 32
#define KEX_CIPHER_BUFSZ 32
#define MSGBUFSZ 2048
/* Cipher NIDs (match OpenSSL values) */
#define NID_undef 0
#define NID_aes_128_gcm 895
#define NID_aes_192_gcm 898
#define NID_aes_256_gcm 901
#define NID_aes_128_ctr 904
#define NID_aes_192_ctr 905
#define NID_aes_256_ctr 906
#define NID_chacha20_poly1305 1018
/* KDF NIDs (match OpenSSL values) */
#define NID_hkdf 1036
#define NID_sha256 672
#define NID_sha384 673
#define NID_sha512 674
#define NID_sha3_256 1096
#define NID_sha3_384 1097
#define NID_sha3_512 1098
#define NID_blake2b512 1056
#define NID_blake2s256 1057
/* KEX algorithm NIDs (match OpenSSL values) */
#define NID_X9_62_prime256v1 415
#define NID_secp384r1 715
#define NID_secp521r1 716
#define NID_X25519 1034
#define NID_X448 1035
#define NID_ffdhe2048 1126
#define NID_ffdhe3072 1127
#define NID_ffdhe4096 1128
#define NID_MLKEM512 1454
#define NID_MLKEM768 1455
#define NID_MLKEM1024 1456
#define NID_X25519MLKEM768 2053 /* !! not in OpenSSL */
#define NID_X448MLKEM1024 2054 /* !! not in OpenSSL */
#define IS_KEM_ALGORITHM(algo) \
(strstr(algo, "ML-KEM") != NULL || strstr(algo, "MLKEM") != NULL)
#define IS_HYBRID_KEM(algo) \
((strstr(algo, "X25519") != NULL || strstr(algo, "X448") != NULL) && \
strstr(algo, "MLKEM") != NULL)
#define X25519MLKEM768_PKSZ 1216 /* 32 + 1184 */
#define X25519MLKEM768_CTSZ 1120 /* 32 + 1088 */
#define X25519MLKEM768_SKSZ 2432 /* 32 + 2400 */
#define X448MLKEM1024_PKSZ 1624 /* 56 + 1568 */
#define X448MLKEM1024_SKSZ 3224 /* 56 + 3168 */
#define KEM_MODE_SERVER_ENCAP 0 /* Server encapsulates (default) */
#define KEM_MODE_CLIENT_ENCAP 1 /* Client encapsulates */
#define IS_KEX_ALGO_SET(cfg) ((cfg)->x.nid != NID_undef)
#define IS_KEX_CIPHER_SET(cfg) ((cfg)->c.nid != NID_undef)
struct crypt_sk {
int nid;
uint8_t * key;
uint8_t rot_bit; /* Rotation bit to control epoch */
};
struct sec_config {
struct {
const char * str;
int nid;
int mode;
} x; /* key exchange */
struct {
const char * str;
int nid;
} k; /* kdf */
struct {
const char * str;
int nid;
} c; /* cipher */
struct {
const char * str;
int nid;
} d; /* digest */
};
/* Helper macros to set sec_config fields consistently */
#define SET_KEX_ALGO(cfg, algo_str) do { \
(cfg)->x.nid = kex_str_to_nid(algo_str); \
(cfg)->x.str = kex_nid_to_str((cfg)->x.nid); \
assert((cfg)->x.nid != NID_undef || (cfg)->x.str == NULL); \
} while (0)
#define SET_KEX_ALGO_NID(cfg, nid_val) do { \
(cfg)->x.nid = (nid_val); \
(cfg)->x.str = kex_nid_to_str((cfg)->x.nid); \
assert((cfg)->x.nid != NID_undef || (cfg)->x.str == NULL); \
} while (0)
#define SET_KEX_KEM_MODE(cfg, mode_val) do { \
(cfg)->x.mode = (mode_val); \
} while (0)
#define SET_KEX_KDF(cfg, kdf_str) do { \
(cfg)->k.nid = md_str_to_nid(kdf_str); \
(cfg)->k.str = md_nid_to_str((cfg)->k.nid); \
assert((cfg)->k.nid != NID_undef || (cfg)->k.str == NULL); \
} while (0)
#define SET_KEX_KDF_NID(cfg, nid_val) do { \
(cfg)->k.nid = (nid_val); \
(cfg)->k.str = md_nid_to_str((cfg)->k.nid); \
assert((cfg)->k.nid != NID_undef || (cfg)->k.str == NULL); \
} while (0)
#define SET_KEX_CIPHER(cfg, cipher_str) do { \
(cfg)->c.nid = crypt_str_to_nid(cipher_str); \
(cfg)->c.str = crypt_nid_to_str((cfg)->c.nid); \
assert((cfg)->c.nid != NID_undef || (cfg)->c.str == NULL); \
} while (0)
#define SET_KEX_CIPHER_NID(cfg, nid_val) do { \
(cfg)->c.nid = (nid_val); \
(cfg)->c.str = crypt_nid_to_str((cfg)->c.nid); \
assert((cfg)->c.nid != NID_undef || (cfg)->c.str == NULL); \
} while (0)
#define SET_KEX_DIGEST(cfg, digest_str) do { \
(cfg)->d.nid = md_str_to_nid(digest_str); \
(cfg)->d.str = md_nid_to_str((cfg)->d.nid); \
assert((cfg)->d.nid != NID_undef || (cfg)->d.str == NULL); \
} while (0)
#define SET_KEX_DIGEST_NID(cfg, nid_val) do { \
(cfg)->d.nid = (nid_val); \
(cfg)->d.str = md_nid_to_str((cfg)->d.nid); \
assert((cfg)->d.nid != NID_undef || (cfg)->d.str == NULL); \
} while (0)
#define CLEAR_KEX_ALGO(cfg) do { \
(cfg)->x.nid = NID_undef; \
(cfg)->x.str = NULL; \
} while (0)
#define CLEAR_KEX_KDF(cfg) do { \
(cfg)->k.nid = NID_undef; \
(cfg)->k.str = NULL; \
} while (0)
#define CLEAR_KEX_CIPHER(cfg) do { \
(cfg)->c.nid = NID_undef; \
(cfg)->c.str = NULL; \
} while (0)
#define CLEAR_KEX_DIGEST(cfg) do { \
(cfg)->d.nid = NID_undef; \
(cfg)->d.str = NULL; \
} while (0)
struct auth_ctx;
struct crypt_ctx;
struct auth_ctx * auth_create_ctx(void);
void auth_destroy_ctx(struct auth_ctx * ctx);
int auth_add_crt_to_store(struct auth_ctx * ctx,
void * crt);
int auth_verify_crt(struct auth_ctx * ctx,
void * crt);
int auth_sign(void * pkp,
int md_nid,
buffer_t msg,
buffer_t * sig);
int auth_verify_sig(void * pk,
int md_nid,
buffer_t msg,
buffer_t sig);
int load_sec_config_file(struct sec_config * cfg,
const char * path);
int kex_pkp_create(struct sec_config * cfg,
void ** pkp,
uint8_t * pk);
void kex_pkp_destroy(void * pkp);
int kex_dhe_derive(struct sec_config * cfg,
void * pkp,
buffer_t pk,
uint8_t * s);
ssize_t kex_kem_encap(buffer_t pk,
uint8_t * ct,
int kdf_nid,
uint8_t * s);
ssize_t kex_kem_encap_raw(buffer_t pk,
uint8_t * ct,
int kdf_nid,
uint8_t * s);
int kex_kem_decap(void * pkp,
buffer_t ct,
int kdf_nid,
uint8_t * s);
int kex_get_algo_from_pk_der(buffer_t pk,
char * algo);
int kex_get_algo_from_pk_raw(buffer_t pk,
char * algo);
int kex_validate_algo(const char * algo);
int kex_validate_nid(int nid);
const char * kex_nid_to_str(uint16_t nid);
uint16_t kex_str_to_nid(const char * algo);
struct crypt_ctx * crypt_create_ctx(struct crypt_sk * sk);
void crypt_destroy_ctx(struct crypt_ctx * ctx);
int crypt_validate_nid(int nid);
const char * crypt_nid_to_str(uint16_t nid);
uint16_t crypt_str_to_nid(const char * cipher);
int md_validate_nid(int nid);
const char * md_nid_to_str(uint16_t nid);
uint16_t md_str_to_nid(const char * kdf);
ssize_t md_digest(int md_nid,
buffer_t in,
uint8_t * out);
ssize_t md_len(int md_nid);
int crypt_encrypt(struct crypt_ctx * ctx,
buffer_t in,
buffer_t * out);
int crypt_decrypt(struct crypt_ctx * ctx,
buffer_t in,
buffer_t * out);
int crypt_get_ivsz(struct crypt_ctx * ctx);
int crypt_get_tagsz(struct crypt_ctx * ctx);
int crypt_load_crt_file(const char * path,
void ** crt);
int crypt_load_crt_str(const char * str,
void ** crt);
int crypt_load_crt_der(buffer_t buf,
void ** crt);
int crypt_get_pubkey_crt(void * crt,
void ** pk);
void crypt_free_crt(void * crt);
int crypt_load_privkey_file(const char * path,
void ** key);
int crypt_load_privkey_str(const char * str,
void ** key);
int crypt_load_pubkey_str(const char * str,
void ** key);
int crypt_load_pubkey_file(const char * path,
void ** key);
int crypt_load_pubkey_file_to_der(const char * path,
buffer_t * buf);
int crypt_load_pubkey_raw_file(const char * path,
buffer_t * buf);
int crypt_load_privkey_raw_file(const char * path,
void ** key);
int crypt_cmp_key(const void * key1,
const void * key2);
void crypt_free_key(void * key);
int crypt_crt_str(const void * crt,
char * buf);
int crypt_crt_der(const void * crt,
buffer_t * buf);
int crypt_check_crt_name(void * crt,
const char * name);
int crypt_get_crt_name(void * crt,
char * name);
/* Secure memory allocation for sensitive data (keys, secrets) */
int crypt_secure_malloc_init(size_t max);
void crypt_secure_malloc_fini(void);
void * crypt_secure_malloc(size_t size);
void crypt_secure_free(void * ptr,
size_t size);
#endif /* OUROBOROS_LIB_CRYPT_H */
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