xref: /openssh-portable/sc25519.h (revision 8a56dc2b)
1 /* $OpenBSD: sc25519.h,v 1.3 2013/12/09 11:03:45 markus Exp $ */
2 
3 /*
4  * Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange,
5  * Peter Schwabe, Bo-Yin Yang.
6  * Copied from supercop-20130419/crypto_sign/ed25519/ref/sc25519.h
7  */
8 
9 #ifndef SC25519_H
10 #define SC25519_H
11 
12 #include "crypto_api.h"
13 
14 #define sc25519                  crypto_sign_ed25519_ref_sc25519
15 #define shortsc25519             crypto_sign_ed25519_ref_shortsc25519
16 #define sc25519_from32bytes      crypto_sign_ed25519_ref_sc25519_from32bytes
17 #define shortsc25519_from16bytes crypto_sign_ed25519_ref_shortsc25519_from16bytes
18 #define sc25519_from64bytes      crypto_sign_ed25519_ref_sc25519_from64bytes
19 #define sc25519_from_shortsc     crypto_sign_ed25519_ref_sc25519_from_shortsc
20 #define sc25519_to32bytes        crypto_sign_ed25519_ref_sc25519_to32bytes
21 #define sc25519_iszero_vartime   crypto_sign_ed25519_ref_sc25519_iszero_vartime
22 #define sc25519_isshort_vartime  crypto_sign_ed25519_ref_sc25519_isshort_vartime
23 #define sc25519_lt_vartime       crypto_sign_ed25519_ref_sc25519_lt_vartime
24 #define sc25519_add              crypto_sign_ed25519_ref_sc25519_add
25 #define sc25519_sub_nored        crypto_sign_ed25519_ref_sc25519_sub_nored
26 #define sc25519_mul              crypto_sign_ed25519_ref_sc25519_mul
27 #define sc25519_mul_shortsc      crypto_sign_ed25519_ref_sc25519_mul_shortsc
28 #define sc25519_window3          crypto_sign_ed25519_ref_sc25519_window3
29 #define sc25519_window5          crypto_sign_ed25519_ref_sc25519_window5
30 #define sc25519_2interleave2     crypto_sign_ed25519_ref_sc25519_2interleave2
31 
32 typedef struct
33 {
34   crypto_uint32 v[32];
35 }
36 sc25519;
37 
38 typedef struct
39 {
40   crypto_uint32 v[16];
41 }
42 shortsc25519;
43 
44 void sc25519_from32bytes(sc25519 *r, const unsigned char x[32]);
45 
46 void shortsc25519_from16bytes(shortsc25519 *r, const unsigned char x[16]);
47 
48 void sc25519_from64bytes(sc25519 *r, const unsigned char x[64]);
49 
50 void sc25519_from_shortsc(sc25519 *r, const shortsc25519 *x);
51 
52 void sc25519_to32bytes(unsigned char r[32], const sc25519 *x);
53 
54 int sc25519_iszero_vartime(const sc25519 *x);
55 
56 int sc25519_isshort_vartime(const sc25519 *x);
57 
58 int sc25519_lt_vartime(const sc25519 *x, const sc25519 *y);
59 
60 void sc25519_add(sc25519 *r, const sc25519 *x, const sc25519 *y);
61 
62 void sc25519_sub_nored(sc25519 *r, const sc25519 *x, const sc25519 *y);
63 
64 void sc25519_mul(sc25519 *r, const sc25519 *x, const sc25519 *y);
65 
66 void sc25519_mul_shortsc(sc25519 *r, const sc25519 *x, const shortsc25519 *y);
67 
68 /* Convert s into a representation of the form \sum_{i=0}^{84}r[i]2^3
69  * with r[i] in {-4,...,3}
70  */
71 void sc25519_window3(signed char r[85], const sc25519 *s);
72 
73 /* Convert s into a representation of the form \sum_{i=0}^{50}r[i]2^5
74  * with r[i] in {-16,...,15}
75  */
76 void sc25519_window5(signed char r[51], const sc25519 *s);
77 
78 void sc25519_2interleave2(unsigned char r[127], const sc25519 *s1, const sc25519 *s2);
79 
80 #endif
81