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