5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /*----- Header files ------------------------------------------------------*/
36 /*----- Main code ---------------------------------------------------------*/
38 /* --- @buf_getmp@ --- *
40 * Arguments: @buf *b@ = pointer to a buffer block
42 * Returns: A multiprecision integer, or null if there wasn't one there.
44 * Use: Gets a multiprecision integer from a buffer.
52 if (buf_getu16(b
, &sz
) || buf_ensure(b
, sz
))
54 m
= mp_loadb(MP_NEW
, BCUR(b
), sz
);
56 if (n
!= sz
&& n
!= 0 && sz
!= 1) {
64 /* --- @buf_putmp@ --- *
66 * Arguments: @buf *b@ = pointer to a buffer block
67 * @mp *m@ = a multiprecision integer
69 * Returns: Zero if it worked, nonzero if there wasn't enough space.
71 * Use: Puts a multiprecision integer to a buffer.
74 int buf_putmp(buf
*b
, mp
*m
)
76 size_t sz
= mp_octets(m
);
79 if (buf_putu16(b
, sz
) || buf_ensure(b
, sz
))
81 mp_storeb(m
, BCUR(b
), sz
);
86 /* --- @buf_getec@ --- *
88 * Arguments: @buf *b@ = pointer to a buffer block
89 * @ec *p@ = where to put the point
91 * Returns: Zero if it worked, nonzero if it failed.
93 * Use: Gets a multiprecision integer from a buffer. The point must
97 int buf_getec(buf
*b
, ec
*p
)
101 if (buf_ensure(b
, 2)) return (-1);
102 n
= LOAD16(BCUR(b
)); if (!n
) { BSTEP(b
, 2); EC_SETINF(p
); return (0); }
103 if ((x
= buf_getmp(b
)) == 0 || (y
= buf_getmp(b
)) == 0) {
104 mp_drop(x
); mp_drop(y
); return (-1);
106 EC_DESTROY(p
); p
->x
= x
; p
->y
= y
; p
->z
= 0;
110 /* --- @buf_putec@ --- *
112 * Arguments: @buf *b@ = pointer to a buffer block
113 * @ec *p@ = an elliptic curve point
115 * Returns: Zero if it worked, nonzero if there wasn't enough space.
117 * Use: Puts an elliptic curve point to a buffer.
120 int buf_putec(buf
*b
, ec
*p
)
122 if (EC_ATINF(p
)) return (buf_putu16(b
, 0));
123 if (buf_putmp(b
, p
->x
) || buf_putmp(b
, p
->y
)) return (-1);
127 /*----- That's all, folks -------------------------------------------------*/