3 * $Id: key-data.h,v 1.2 2000/06/17 11:26:18 mdw Exp $
5 * Manipulating key data
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
14 * Catacomb is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * Catacomb is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with Catacomb; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
32 * $Log: key-data.h,v $
33 * Revision 1.2 2000/06/17 11:26:18 mdw
34 * Add the key packing interface.
36 * Revision 1.1 2000/02/12 18:21:23 mdw
37 * Overhaul of key management (again).
41 #ifndef CATACOMB_KEY_DATA_H
42 #define CATACOMB_KEY_DATA_H
48 /*----- Header files ------------------------------------------------------*/
52 #include <mLib/bits.h>
53 #include <mLib/dstr.h>
60 /*----- Data structures ---------------------------------------------------*/
62 /* --- Key binary data --- */
64 typedef struct key_bin
{
65 octet
*k
; /* Pointer to key data */
66 size_t sz
; /* Size of the key data (in bytes) */
69 /* --- Key data structure --- */
71 typedef struct key_data
{
72 unsigned e
; /* Encoding type for key data */
74 key_bin k
; /* Binary key data */
75 mp
*m
; /* Multiprecision integer */
76 sym_table s
; /* Structured key data */
80 typedef struct key_struct
{
85 /* --- Packing and unpacking --- */
87 typedef struct key_packdef
{
88 void *p
; /* Pointer to the destination */
89 key_data kd
; /* Key data block */
92 typedef struct key_packstruct
{
93 char *name
; /* Pointer to name string */
94 key_packdef kp
; /* Packing structure */
97 /* --- Key binary encoding --- *
99 * The binary encoding consists of a header containing a 16-bit encoding type
100 * and a 16-bit length, followed immediately by the key data, followed by
101 * between zero and three zero bytes to make the total length a multiple of
102 * four. The format of the following data depends on the encoding type:
104 * @KENC_BINARY@ Binary data.
106 * @KENC_MP@ Octet array interpreted in big-endian byte order.
108 * @KENC_STRUCT@ An array of pairs, each containing a string (8-bit
109 * length followed by data and zero-padding to 4-byte
110 * boundary) and key binary encodings.
112 * @KENC_ENCRYPT@ Binary data, format
115 /* --- Key encoding methods and other flags--- */
119 /* --- Bottom two bits are the encoding type --- */
121 KF_ENCMASK
= 0x03, /* Encoding mask */
122 KENC_BINARY
= 0x00, /* Plain binary key (@k@) */
123 KENC_MP
= 0x01, /* Multiprecision integer (@i@) */
124 KENC_STRUCT
= 0x02, /* Structured key data (@s@) */
125 KENC_ENCRYPT
= 0x03, /* Encrypted key type (@k@) */
127 /* --- Key category bits --- */
129 KF_CATMASK
= 0x0c, /* Category mask */
130 KCAT_SYMM
= 0x00, /* Symmetric encryption key */
131 KCAT_PRIV
= 0x04, /* Private (asymmetric) key */
132 KCAT_PUB
= 0x08, /* Public (asymmetric) key */
133 KCAT_SHARE
= 0x0c, /* Shared (asymmetric) key */
134 KF_NONSECRET
= 0x08, /* Bit flag for non-secret keys */
136 /* --- Other flags --- */
138 KF_BURN
= 0x10, /* Burn key after use */
139 KF_TEMP
= 0x20, /* Temporary copy flag */
140 KF_OPT
= 0x40, /* Optional key (for @key_unpack@) */
142 /* --- Tag end --- */
144 KENC_MAX
/* Dummy limit constant */
147 /* --- Key flag filtering --- */
149 typedef struct key_filter
{
154 /* --- Matching aginst key selection --- */
156 #define KEY_MATCH(kd, kf) \
158 ((kd)->e & KF_ENCMASK) == KENC_STRUCT || \
159 ((kd)->e & (kf)->m) == (kf)->f)
161 /*----- Key flags and filtering -------------------------------------------*/
163 /* --- @key_readflags@ --- *
165 * Arguments: @const char *p@ = pointer to string to read
166 * @char **pp@ = where to store the end pointer
167 * @unsigned *ff@ = where to store the flags
168 * @unsigned *mm@ = where to store the mask
170 * Returns: Zero if all went well, nonzero if there was an error.
172 * Use: Reads a flag string.
175 extern int key_readflags(const char */
*p*/
, char **/
*pp*/
,
176 unsigned */
*ff*/
, unsigned */
*mm*/
);
178 /* --- @key_writeflags@ --- *
180 * Arguments: @unsigned f@ = flags to write
181 * @dstr *d@ = pointer to destination string
185 * Use: Emits a flags word as a string representation.
188 extern void key_writeflags(unsigned /*f*/, dstr */
*d*/
);
190 /* --- @key_match@ --- *
192 * Arguments: @key_data *k@ = pointer to key data block
193 * @const key_filter *kf@ = pointer to filter block
195 * Returns: Nonzero if the key matches the filter.
197 * Use: Checks whether a key matches a filter.
200 extern int key_match(key_data */
*k*/
, const key_filter */
*kf*/
);
202 /*----- Setting new key data ----------------------------------------------*/
204 /* --- @key_binary@ --- *
206 * Arguments: @key_data *k@ = pointer to key data block
207 * @const void *p@ = pointer to key data
208 * @size_t sz@ = size of the key data
212 * Use: Sets a binary key in a key data block.
215 extern void key_binary(key_data */
*k*/
, const void */
*p*/
, size_t /*sz*/);
217 /* --- @key_encrypted@ --- *
219 * Arguments: @key_data *k@ = pointer to key data block
220 * @const void *p@ = pointer to key data
221 * @size_t sz@ = size of the key data
225 * Use: Sets an encrypted key in a key data block.
228 extern void key_encrypted(key_data */
*k*/
, const void */
*p*/
, size_t /*sz*/);
230 /* --- @key_mp@ --- *
232 * Arguments: @key_data *k@ = pointer to key data block
233 * @mp *m@ = pointer to the value to set
237 * Use: Sets a multiprecision integer key in a key block.
240 extern void key_mp(key_data */
*k*/
, mp */
*m*/
);
242 /* --- @key_structure@ --- *
244 * Arguments: @key_data *k@ = pointer to key data block
248 * Use: Initializes a structured key type.
251 extern void key_structure(key_data */
*k*/
);
253 /* --- @key_structfind@ --- *
255 * Arguments: @key_data *k@ = pointer to key data block
256 * @const char *tag@ = pointer to tag string
258 * Returns: Pointer to key data block, or null.
260 * Use: Looks up the tag in a structured key.
263 extern key_data
*key_structfind(key_data */
*k*/
, const char */
*tag*/
);
265 /* --- @key_structcreate@ --- *
267 * Arguments: @key_data *k@ = pointer to key data block
268 * @const char *tag@ = pointer to tag string
270 * Returns: Pointer to newly created key data.
272 * Use: Creates a new uninitialized subkey.
275 extern key_data
*key_structcreate(key_data */
*k*/
, const char */
*tag*/
);
277 /*----- Miscellaneous operations ------------------------------------------*/
279 /* --- @key_destroy@ --- *
281 * Arguments: @key_data *k@ = pointer to key data to destroy
285 * Use: Destroys a lump of key data.
288 extern void key_destroy(key_data */
*k*/
);
290 /* --- @key_do@ --- *
292 * Arguments: @key_data *k@ = pointer to key data block
293 * @const key_filter *kf@ = pointer to filter block
294 * @dstr *d@ = pointer to base string
295 * @int (*func)(key_data *kd, dstr *d, void *p@ = function
296 * @void *p@ = argument to function
298 * Returns: Nonzero return code from function, or zero.
300 * Use: Runs a function over all the leaves of a key.
303 extern int key_do(key_data */
*k*/
, const key_filter */
*kf*/
, dstr */
*d*/
,
304 int (*/
*func*/
)(key_data */
*kd*/
,
305 dstr */
*d*/
, void */
*p*/
),
308 /* --- @key_copy@ --- *
310 * Arguments: @key_data *kd@ = pointer to destination data block
311 * @key_data *k@ = pointer to source data block
312 * @const key_filter *kf@ = pointer to filter block
314 * Returns: Nonzero if an item was actually copied.
316 * Use: Copies a chunk of key data from one place to another.
319 extern int key_copy(key_data */
*kd*/
, key_data */
*k*/
,
320 const key_filter */
*kf*/
);
322 /*----- Textual encoding --------------------------------------------------*/
324 /* --- @key_read@ --- *
326 * Arguments: @const char *p@ = pointer to textual key representation
327 * @key_data *k@ = pointer to output block for key data
328 * @char **pp@ = where to store the end pointer
330 * Returns: Zero if all went well, nonzero if there was a problem.
332 * Use: Parses a textual key description.
335 extern int key_read(const char */
*p*/
, key_data */
*k*/
, char **/
*pp*/
);
337 /* --- @key_write@ --- *
339 * Arguments: @key_data *k@ = pointer to key data
340 * @dstr *d@ = destination string to write on
341 * @const key_filter *kf@ = pointer to key selection block
343 * Returns: Nonzero if any items were actually written.
345 * Use: Writes a key in a textual encoding.
348 extern int key_write(key_data */
*k*/
, dstr */
*d*/
,
349 const key_filter */
*kf*/
);
351 /*----- Key binary encoding -----------------------------------------------*/
353 /* --- @key_decode@ --- *
355 * Arguments: @const void *p@ = pointer to buffer to read
356 * @size_t sz@ = size of the buffer
357 * @key_data *k@ = pointer to key data block to write to
359 * Returns: Zero if everything worked, nonzero otherwise.
361 * Use: Decodes a binary representation of a key.
364 extern int key_decode(const void */
*p*/
, size_t /*sz*/, key_data */
*k*/
);
366 /* --- @key_encode@ --- *
368 * Arguments: @key_data *k@ = pointer to key data block
369 * @dstr *d@ = pointer to destination string
370 * @const key_filter *kf@ = pointer to key selection block
372 * Returns: Nonzero if any items were actually written.
374 * Use: Encodes a key block as binary data.
377 extern int key_encode(key_data */
*k*/
, dstr */
*d*/
,
378 const key_filter */
*kf*/
);
380 /*----- Packing and unpacking keys ----------------------------------------*/
382 /* --- @key_pack@ --- *
384 * Arguments: @key_packdef *kp@ = pointer to packing structure
385 * @key_data *kd@ = pointer to destination key data
386 * @dstr *d@ = pointer to tag string for the key data
388 * Returns: Error code, or zero.
390 * Use: Packs a key from a data structure.
393 extern int key_pack(key_packdef */
*kp*/
, key_data */
*kd*/
, dstr */
*d*/
);
395 /* --- @key_unpack@ --- *
397 * Arguments: @key_packdef *kp@ = pointer to packing structure
398 * @key_data *kd@ = pointer to source key data
399 * @dstr *d@ = pointer to tag string for the key data
401 * Returns: Error code, or zero.
403 * Use: Unpacks a key into an appropriate data structure.
406 extern int key_unpack(key_packdef */
*kp*/
, key_data */
*kd*/
, dstr */
*d*/
);
408 /* --- @key_unpackdone@ --- *
410 * Arguments: @key_packdef *kp@ = pointer to packing definition
414 * Use: Frees the key components contained within a packing
415 * definition, created during key unpacking.
418 extern void key_unpackdone(key_packdef */
*kp*/
);
420 /*----- Passphrase encryption ---------------------------------------------*/
422 /* --- @key_plock@ --- *
424 * Arguments: @const char *tag@ = tag to use for passphrase
425 * @key_data *k@ = source key data block
426 * @key_data *kt@ = target key data block
428 * Returns: Zero if successful, nonzero if there was a problem.
430 * Use: Locks a key by encrypting it with a passphrase.
433 extern int key_plock(const char */
*tag*/
, key_data */
*k*/
, key_data */
*kt*/
);
435 /* --- @key_punlock@ --- *
437 * Arguments: @const char *tag@ = tag to use for passphrase
438 * @key_data *k@ = source key data block
439 * @key_data *kt@ = target key data block
441 * Returns: Zero if it worked, nonzero if it didn't.
443 * Use: Unlocks a passphrase-locked key.
446 extern int key_punlock(const char */
*tag*/
,
447 key_data */
*k*/
, key_data */
*kt*/
);
449 /*----- That's all, folks -------------------------------------------------*/