aboutsummaryrefslogtreecommitdiffstats
path: root/src/eap_common/eap_pwd_common.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/eap_common/eap_pwd_common.h')
-rw-r--r--src/eap_common/eap_pwd_common.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/src/eap_common/eap_pwd_common.h b/src/eap_common/eap_pwd_common.h
new file mode 100644
index 0000000..7389894
--- /dev/null
+++ b/src/eap_common/eap_pwd_common.h
@@ -0,0 +1,79 @@
+/*
+ * EAP server/peer: EAP-pwd shared definitions
+ * Copyright (c) 2009, Dan Harkins <dharkins@lounge.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the BSD license.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation.
+ *
+ * See README and COPYING for more details.
+ */
+
+#ifndef EAP_PWD_COMMON_H
+#define EAP_PWD_COMMON_H
+
+#include <openssl/bn.h>
+#include <openssl/sha.h>
+#include <openssl/ec.h>
+#include <openssl/evp.h>
+#include <openssl/hmac.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
+ */
+struct eap_pwd_hdr {
+ u8 l_bit:1;
+ u8 m_bit:1;
+ u8 exch:6;
+ u8 total_length[0]; /* included when l_bit is set */
+} STRUCT_PACKED;
+
+#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)->lm_exch & 0x80)
+#define EAP_PWD_SET_LENGTH_BIT(x) ((x)->lm_exch |= 0x80)
+#define EAP_PWD_GET_MORE_BIT(x) ((x)->lm_exch & 0x40)
+#define EAP_PWD_SET_MORE_BIT(x) ((x)->lm_exch |= 0x40)
+#define EAP_PWD_GET_EXCHANGE(x) ((x)->lm_exch & 0x3f)
+#define EAP_PWD_SET_EXCHANGE(x,y) ((x)->lm_exch |= (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 *, EC_POINT *, EC_POINT *,
+ BIGNUM *, BIGNUM *, u32 *, u8 *, u8 *);
+void H_Init(HMAC_CTX *);
+void H_Update(HMAC_CTX *, const u8 *, int);
+void H_Final(HMAC_CTX *, u8 *);
+
+#endif /* EAP_PWD_COMMON_H */