hostap/src/eap_common/eap_pwd_common.h
Dan Harkins a8712ce5b3 EAP-pwd: Pre-processing method definitions from RFC 8146
Add new password pre-processing method definitions in preparation for
salted passwords with EAP-pwd.

Signed-off-by: Dan Harkins <dharkins@lounge.org>
2018-05-28 17:15:07 +03:00

71 lines
2.3 KiB
C

/*
* EAP server/peer: EAP-pwd shared definitions
* Copyright (c) 2009, Dan Harkins <dharkins@lounge.org>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#ifndef EAP_PWD_COMMON_H
#define EAP_PWD_COMMON_H
/*
* definition of a finite cyclic group
* TODO: support one based on a prime field
*/
typedef struct group_definition_ {
u16 group_num;
struct crypto_ec *group;
struct crypto_ec_point *pwe;
} EAP_PWD_group;
/*
* EAP-pwd header, included on all payloads
* L(1 bit) | M(1 bit) | exch(6 bits) | total_length(if L is set)
*/
#define EAP_PWD_HDR_SIZE 1
#define EAP_PWD_OPCODE_ID_EXCH 1
#define EAP_PWD_OPCODE_COMMIT_EXCH 2
#define EAP_PWD_OPCODE_CONFIRM_EXCH 3
#define EAP_PWD_GET_LENGTH_BIT(x) ((x) & 0x80)
#define EAP_PWD_SET_LENGTH_BIT(x) ((x) |= 0x80)
#define EAP_PWD_GET_MORE_BIT(x) ((x) & 0x40)
#define EAP_PWD_SET_MORE_BIT(x) ((x) |= 0x40)
#define EAP_PWD_GET_EXCHANGE(x) ((x) & 0x3f)
#define EAP_PWD_SET_EXCHANGE(x,y) ((x) |= (y))
/* EAP-pwd-ID payload */
struct eap_pwd_id {
be16 group_num;
u8 random_function;
#define EAP_PWD_DEFAULT_RAND_FUNC 1
u8 prf;
#define EAP_PWD_DEFAULT_PRF 1
u8 token[4];
u8 prep;
#define EAP_PWD_PREP_NONE 0
#define EAP_PWD_PREP_MS 1
#define EAP_PWD_PREP_SSHA1 3
#define EAP_PWD_PREP_SSHA256 4
#define EAP_PWD_PREP_SSHA512 5
u8 identity[0]; /* length inferred from payload */
} STRUCT_PACKED;
/* common routines */
EAP_PWD_group * get_eap_pwd_group(u16 num);
int compute_password_element(EAP_PWD_group *grp, u16 num,
const u8 *password, size_t password_len,
const u8 *id_server, size_t id_server_len,
const u8 *id_peer, size_t id_peer_len,
const u8 *token);
int compute_keys(EAP_PWD_group *grp, const struct crypto_bignum *k,
const struct crypto_bignum *peer_scalar,
const struct crypto_bignum *server_scalar,
const u8 *confirm_peer, const u8 *confirm_server,
const u32 *ciphersuite, u8 *msk, u8 *emsk, u8 *session_id);
struct crypto_hash * eap_pwd_h_init(void);
void eap_pwd_h_update(struct crypto_hash *hash, const u8 *data, size_t len);
void eap_pwd_h_final(struct crypto_hash *hash, u8 *digest);
#endif /* EAP_PWD_COMMON_H */