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1 /*
2  * Implement J-PAKE, as described in
3  * http://grouper.ieee.org/groups/1363/Research/contributions/hao-ryan-2008.pdf
4  *
5  * With hints from http://www.cl.cam.ac.uk/~fh240/software/JPAKE2.java.
6  */
7 
8 #ifndef HEADER_JPAKE_H
9 #define HEADER_JPAKE_H
10 
11 #include <openssl/opensslconf.h>
12 
13 #ifdef OPENSSL_NO_JPAKE
14 #error JPAKE is disabled.
15 #endif
16 
17 #ifdef  __cplusplus
18 extern "C" {
19 #endif
20 
21 #include <openssl/bn.h>
22 #include <openssl/sha.h>
23 
24 typedef struct JPAKE_CTX JPAKE_CTX;
25 
26 /* Note that "g" in the ZKPs is not necessarily the J-PAKE g. */
27 typedef struct
28     {
29     BIGNUM *gr; /* g^r (r random) */
30     BIGNUM *b;  /* b = r - x*h, h=hash(g, g^r, g^x, name) */
31     } JPAKE_ZKP;
32 
33 typedef struct
34     {
35     BIGNUM *gx;       /* g^x in step 1, g^(xa + xc + xd) * xb * s in step 2 */
36     JPAKE_ZKP zkpx;   /* ZKP(x) or ZKP(xb * s) */
37     } JPAKE_STEP_PART;
38 
39 typedef struct
40     {
41     JPAKE_STEP_PART p1;   /* g^x3, ZKP(x3) or g^x1, ZKP(x1) */
42     JPAKE_STEP_PART p2;   /* g^x4, ZKP(x4) or g^x2, ZKP(x2) */
43     } JPAKE_STEP1;
44 
45 typedef JPAKE_STEP_PART JPAKE_STEP2;
46 
47 typedef struct
48     {
49     unsigned char hhk[SHA_DIGEST_LENGTH];
50     } JPAKE_STEP3A;
51 
52 typedef struct
53     {
54     unsigned char hk[SHA_DIGEST_LENGTH];
55     } JPAKE_STEP3B;
56 
57 /* Parameters are copied */
58 JPAKE_CTX *JPAKE_CTX_new(const char *name, const char *peer_name,
59 			 const BIGNUM *p, const BIGNUM *g, const BIGNUM *q,
60 			 const BIGNUM *secret);
61 void JPAKE_CTX_free(JPAKE_CTX *ctx);
62 
63 /*
64  * Note that JPAKE_STEP1 can be used multiple times before release
65  * without another init.
66  */
67 void JPAKE_STEP1_init(JPAKE_STEP1 *s1);
68 int JPAKE_STEP1_generate(JPAKE_STEP1 *send, JPAKE_CTX *ctx);
69 int JPAKE_STEP1_process(JPAKE_CTX *ctx, const JPAKE_STEP1 *received);
70 void JPAKE_STEP1_release(JPAKE_STEP1 *s1);
71 
72 /*
73  * Note that JPAKE_STEP2 can be used multiple times before release
74  * without another init.
75  */
76 void JPAKE_STEP2_init(JPAKE_STEP2 *s2);
77 int JPAKE_STEP2_generate(JPAKE_STEP2 *send, JPAKE_CTX *ctx);
78 int JPAKE_STEP2_process(JPAKE_CTX *ctx, const JPAKE_STEP2 *received);
79 void JPAKE_STEP2_release(JPAKE_STEP2 *s2);
80 
81 /*
82  * Optionally verify the shared key. If the shared secrets do not
83  * match, the two ends will disagree about the shared key, but
84  * otherwise the protocol will succeed.
85  */
86 void JPAKE_STEP3A_init(JPAKE_STEP3A *s3a);
87 int JPAKE_STEP3A_generate(JPAKE_STEP3A *send, JPAKE_CTX *ctx);
88 int JPAKE_STEP3A_process(JPAKE_CTX *ctx, const JPAKE_STEP3A *received);
89 void JPAKE_STEP3A_release(JPAKE_STEP3A *s3a);
90 
91 void JPAKE_STEP3B_init(JPAKE_STEP3B *s3b);
92 int JPAKE_STEP3B_generate(JPAKE_STEP3B *send, JPAKE_CTX *ctx);
93 int JPAKE_STEP3B_process(JPAKE_CTX *ctx, const JPAKE_STEP3B *received);
94 void JPAKE_STEP3B_release(JPAKE_STEP3B *s3b);
95 
96 /*
97  * the return value belongs to the library and will be released when
98  * ctx is released, and will change when a new handshake is performed.
99  */
100 const BIGNUM *JPAKE_get_shared_key(JPAKE_CTX *ctx);
101 
102 /* BEGIN ERROR CODES */
103 /* The following lines are auto generated by the script mkerr.pl. Any changes
104  * made after this point may be overwritten when the script is next run.
105  */
106 void ERR_load_JPAKE_strings(void);
107 
108 /* Error codes for the JPAKE functions. */
109 
110 /* Function codes. */
111 #define JPAKE_F_JPAKE_STEP1_PROCESS			 101
112 #define JPAKE_F_JPAKE_STEP2_PROCESS			 102
113 #define JPAKE_F_JPAKE_STEP3A_PROCESS			 103
114 #define JPAKE_F_JPAKE_STEP3B_PROCESS			 104
115 #define JPAKE_F_VERIFY_ZKP				 100
116 
117 /* Reason codes. */
118 #define JPAKE_R_G_TO_THE_X4_IS_ONE			 105
119 #define JPAKE_R_HASH_OF_HASH_OF_KEY_MISMATCH		 106
120 #define JPAKE_R_HASH_OF_KEY_MISMATCH			 107
121 #define JPAKE_R_VERIFY_B_FAILED				 102
122 #define JPAKE_R_VERIFY_X3_FAILED			 103
123 #define JPAKE_R_VERIFY_X4_FAILED			 104
124 #define JPAKE_R_ZKP_VERIFY_FAILED			 100
125 
126 #ifdef  __cplusplus
127 }
128 #endif
129 #endif
130