| /* |
| * 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 |
| |
| #include <openssl/bn.h> |
| #include <openssl/ec.h> |
| #include <openssl/evp.h> |
| |
| /* |
| * definition of a finite cyclic group |
| * TODO: support one based on a prime field |
| */ |
| typedef struct group_definition_ { |
| u16 group_num; |
| EC_GROUP *group; |
| EC_POINT *pwe; |
| BIGNUM *order; |
| BIGNUM *prime; |
| } 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 |
| u8 identity[0]; /* length inferred from payload */ |
| } STRUCT_PACKED; |
| |
| /* common routines */ |
| int compute_password_element(EAP_PWD_group *, u16, u8 *, int, u8 *, int, u8 *, |
| int, u8 *); |
| int compute_keys(EAP_PWD_group *, BN_CTX *, BIGNUM *, BIGNUM *, BIGNUM *, |
| u8 *, u8 *, u32 *, u8 *, u8 *); |
| 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 */ |
