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      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