/src/wolfssl/wolfcrypt/src/curve448.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* curve448.c |
2 | | * |
3 | | * Copyright (C) 2006-2024 wolfSSL Inc. |
4 | | * |
5 | | * This file is part of wolfSSL. |
6 | | * |
7 | | * wolfSSL is free software; you can redistribute it and/or modify |
8 | | * it under the terms of the GNU General Public License as published by |
9 | | * the Free Software Foundation; either version 2 of the License, or |
10 | | * (at your option) any later version. |
11 | | * |
12 | | * wolfSSL is distributed in the hope that it will be useful, |
13 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | | * GNU General Public License for more details. |
16 | | * |
17 | | * You should have received a copy of the GNU General Public License |
18 | | * along with this program; if not, write to the Free Software |
19 | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA |
20 | | */ |
21 | | |
22 | | /* Implemented to: RFC 7748 */ |
23 | | |
24 | | /* Based On Daniel J Bernstein's curve25519 Public Domain ref10 work. |
25 | | * Reworked for curve448 by Sean Parkinson. |
26 | | */ |
27 | | |
28 | | #ifdef HAVE_CONFIG_H |
29 | | #include <config.h> |
30 | | #endif |
31 | | |
32 | | #include <wolfssl/wolfcrypt/settings.h> |
33 | | |
34 | | #ifdef HAVE_CURVE448 |
35 | | |
36 | | #include <wolfssl/wolfcrypt/curve448.h> |
37 | | #include <wolfssl/wolfcrypt/error-crypt.h> |
38 | | #ifdef NO_INLINE |
39 | | #include <wolfssl/wolfcrypt/misc.h> |
40 | | #else |
41 | | #define WOLFSSL_MISC_INCLUDED |
42 | | #include <wolfcrypt/src/misc.c> |
43 | | #endif |
44 | | |
45 | | int wc_curve448_make_pub(int public_size, byte* pub, int private_size, |
46 | | const byte* priv) |
47 | 3 | { |
48 | 3 | int ret; |
49 | 3 | unsigned char basepoint[CURVE448_KEY_SIZE] = {5}; |
50 | | |
51 | 3 | if ((pub == NULL) || (priv == NULL)) { |
52 | 0 | return ECC_BAD_ARG_E; |
53 | 0 | } |
54 | 3 | if ((public_size != CURVE448_PUB_KEY_SIZE) || |
55 | 3 | (private_size != CURVE448_KEY_SIZE)) { |
56 | 0 | return ECC_BAD_ARG_E; |
57 | 0 | } |
58 | | |
59 | 3 | fe448_init(); |
60 | | |
61 | | /* compute public key */ |
62 | 3 | ret = curve448(pub, priv, basepoint); |
63 | | |
64 | 3 | return ret; |
65 | 3 | } |
66 | | |
67 | | |
68 | | /* Make a new curve448 private/public key. |
69 | | * |
70 | | * rng [in] Random number generator. |
71 | | * keysize [in] Size of the key to generate. |
72 | | * key [in] Curve448 key object. |
73 | | * returns BAD_FUNC_ARG when rng or key are NULL, |
74 | | * ECC_BAD_ARG_E when keysize is not CURVE448_KEY_SIZE, |
75 | | * 0 otherwise. |
76 | | */ |
77 | | int wc_curve448_make_key(WC_RNG* rng, int keysize, curve448_key* key) |
78 | 3 | { |
79 | 3 | int ret = 0; |
80 | | |
81 | 3 | if ((key == NULL) || (rng == NULL)) { |
82 | 0 | ret = BAD_FUNC_ARG; |
83 | 0 | } |
84 | | |
85 | | /* currently only a key size of 56 bytes is used */ |
86 | 3 | if ((ret == 0) && (keysize != CURVE448_KEY_SIZE)) { |
87 | 0 | ret = ECC_BAD_ARG_E; |
88 | 0 | } |
89 | | |
90 | 3 | if (ret == 0) { |
91 | | /* random number for private key */ |
92 | 3 | ret = wc_RNG_GenerateBlock(rng, key->k, (word32)keysize); |
93 | 3 | } |
94 | 3 | if (ret == 0) { |
95 | 3 | key->privSet = 1; |
96 | | |
97 | | /* clamp private */ |
98 | 3 | key->k[0] &= 0xfc; |
99 | 3 | key->k[CURVE448_KEY_SIZE-1] |= 0x80; |
100 | | |
101 | | /* compute public */ |
102 | 3 | ret = wc_curve448_make_pub((int)sizeof(key->p), key->p, |
103 | 3 | (int)sizeof(key->k), key->k); |
104 | 3 | if (ret == 0) { |
105 | 3 | key->pubSet = 1; |
106 | 3 | } |
107 | 0 | else { |
108 | 0 | ForceZero(key->k, sizeof(key->k)); |
109 | 0 | XMEMSET(key->p, 0, sizeof(key->p)); |
110 | 0 | } |
111 | 3 | } |
112 | | |
113 | 3 | return ret; |
114 | 3 | } |
115 | | |
116 | | #ifdef HAVE_CURVE448_SHARED_SECRET |
117 | | |
118 | | /* Calculate the shared secret from the private key and peer's public key. |
119 | | * Calculation over curve448. |
120 | | * Secret encoded big-endian. |
121 | | * |
122 | | * private_key [in] Curve448 private key. |
123 | | * public_key [in] Curve448 public key. |
124 | | * out [in] Array to hold shared secret. |
125 | | * outLen [in/out] On in, the number of bytes in array. |
126 | | * On out, the number bytes put into array. |
127 | | * returns BAD_FUNC_ARG when a parameter is NULL or outLen is less than |
128 | | * CURVE448_KEY_SIZE, |
129 | | * 0 otherwise. |
130 | | */ |
131 | | int wc_curve448_shared_secret(curve448_key* private_key, |
132 | | curve448_key* public_key, |
133 | | byte* out, word32* outLen) |
134 | 0 | { |
135 | 0 | return wc_curve448_shared_secret_ex(private_key, public_key, out, outLen, |
136 | 0 | EC448_BIG_ENDIAN); |
137 | 0 | } |
138 | | |
139 | | /* Calculate the shared secret from the private key and peer's public key. |
140 | | * Calculation over curve448. |
141 | | * |
142 | | * private_key [in] Curve448 private key. |
143 | | * public_key [in] Curve448 public key. |
144 | | * out [in] Array to hold shared secret. |
145 | | * outLen [in/out] On in, the number of bytes in array. |
146 | | * On out, the number bytes put into array. |
147 | | * endian [in] Endianness to use when encoding number in array. |
148 | | * returns BAD_FUNC_ARG when a parameter is NULL or outLen is less than |
149 | | * CURVE448_PUB_KEY_SIZE, |
150 | | * 0 otherwise. |
151 | | */ |
152 | | int wc_curve448_shared_secret_ex(curve448_key* private_key, |
153 | | curve448_key* public_key, |
154 | | byte* out, word32* outLen, int endian) |
155 | 0 | { |
156 | 0 | unsigned char o[CURVE448_PUB_KEY_SIZE]; |
157 | 0 | int ret = 0; |
158 | 0 | int i; |
159 | | |
160 | | /* sanity check */ |
161 | 0 | if ((private_key == NULL) || (public_key == NULL) || (out == NULL) || |
162 | 0 | (outLen == NULL) || (*outLen < CURVE448_PUB_KEY_SIZE)) { |
163 | 0 | ret = BAD_FUNC_ARG; |
164 | 0 | } |
165 | | /* make sure we have a populated private and public key */ |
166 | 0 | if (ret == 0 && (!private_key->privSet || !public_key->pubSet)) { |
167 | 0 | ret = ECC_BAD_ARG_E; |
168 | 0 | } |
169 | |
|
170 | 0 | if (ret == 0) { |
171 | 0 | ret = curve448(o, private_key->k, public_key->p); |
172 | 0 | } |
173 | | #ifdef WOLFSSL_ECDHX_SHARED_NOT_ZERO |
174 | | if (ret == 0) { |
175 | | byte t = 0; |
176 | | for (i = 0; i < CURVE448_PUB_KEY_SIZE; i++) { |
177 | | t |= o[i]; |
178 | | } |
179 | | if (t == 0) { |
180 | | ret = ECC_OUT_OF_RANGE_E; |
181 | | } |
182 | | } |
183 | | #endif |
184 | 0 | if (ret == 0) { |
185 | 0 | if (endian == EC448_BIG_ENDIAN) { |
186 | | /* put shared secret key in Big Endian format */ |
187 | 0 | for (i = 0; i < CURVE448_PUB_KEY_SIZE; i++) { |
188 | 0 | out[i] = o[CURVE448_PUB_KEY_SIZE - i -1]; |
189 | 0 | } |
190 | 0 | } |
191 | 0 | else { |
192 | | /* put shared secret key in Little Endian format */ |
193 | 0 | XMEMCPY(out, o, CURVE448_PUB_KEY_SIZE); |
194 | 0 | } |
195 | |
|
196 | 0 | *outLen = CURVE448_PUB_KEY_SIZE; |
197 | 0 | } |
198 | |
|
199 | 0 | ForceZero(o, CURVE448_PUB_KEY_SIZE); |
200 | |
|
201 | 0 | return ret; |
202 | 0 | } |
203 | | |
204 | | #endif /* HAVE_CURVE448_SHARED_SECRET */ |
205 | | |
206 | | #ifdef HAVE_CURVE448_KEY_EXPORT |
207 | | |
208 | | /* Export the curve448 public key. |
209 | | * Public key encoded big-endian. |
210 | | * |
211 | | * key [in] Curve448 public key. |
212 | | * out [in] Array to hold public key. |
213 | | * outLen [in/out] On in, the number of bytes in array. |
214 | | * On out, the number bytes put into array. |
215 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
216 | | * ECC_BAD_ARG_E when outLen is less than CURVE448_PUB_KEY_SIZE, |
217 | | * 0 otherwise. |
218 | | */ |
219 | | int wc_curve448_export_public(curve448_key* key, byte* out, word32* outLen) |
220 | 0 | { |
221 | 0 | return wc_curve448_export_public_ex(key, out, outLen, EC448_BIG_ENDIAN); |
222 | 0 | } |
223 | | |
224 | | /* Export the curve448 public key. |
225 | | * |
226 | | * key [in] Curve448 public key. |
227 | | * out [in] Array to hold public key. |
228 | | * outLen [in/out] On in, the number of bytes in array. |
229 | | * On out, the number bytes put into array. |
230 | | * endian [in] Endianness to use when encoding number in array. |
231 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
232 | | * ECC_BAD_ARG_E when outLen is less than CURVE448_PUB_KEY_SIZE, |
233 | | * 0 otherwise. |
234 | | */ |
235 | | int wc_curve448_export_public_ex(curve448_key* key, byte* out, word32* outLen, |
236 | | int endian) |
237 | 2 | { |
238 | 2 | int ret = 0; |
239 | | |
240 | 2 | if ((key == NULL) || (out == NULL) || (outLen == NULL)) { |
241 | 0 | ret = BAD_FUNC_ARG; |
242 | 0 | } |
243 | | |
244 | | /* check and set outgoing key size */ |
245 | 2 | if ((ret == 0) && (*outLen < CURVE448_PUB_KEY_SIZE)) { |
246 | 0 | *outLen = CURVE448_PUB_KEY_SIZE; |
247 | 0 | ret = ECC_BAD_ARG_E; |
248 | 0 | } |
249 | 2 | if (ret == 0) { |
250 | | /* calculate public if missing */ |
251 | 2 | if (!key->pubSet) { |
252 | 0 | ret = wc_curve448_make_pub((int)sizeof(key->p), key->p, |
253 | 0 | (int)sizeof(key->k), key->k); |
254 | 0 | key->pubSet = (ret == 0); |
255 | 0 | } |
256 | 2 | } |
257 | 2 | if (ret == 0) { |
258 | 2 | *outLen = CURVE448_PUB_KEY_SIZE; |
259 | 2 | if (endian == EC448_BIG_ENDIAN) { |
260 | 0 | int i; |
261 | | /* read keys in Big Endian format */ |
262 | 0 | for (i = 0; i < CURVE448_PUB_KEY_SIZE; i++) { |
263 | 0 | out[i] = key->p[CURVE448_PUB_KEY_SIZE - i - 1]; |
264 | 0 | } |
265 | 0 | } |
266 | 2 | else { |
267 | 2 | XMEMCPY(out, key->p, CURVE448_PUB_KEY_SIZE); |
268 | 2 | } |
269 | 2 | } |
270 | | |
271 | 2 | return ret; |
272 | 2 | } |
273 | | |
274 | | #endif /* HAVE_CURVE448_KEY_EXPORT */ |
275 | | |
276 | | #ifdef HAVE_CURVE448_KEY_IMPORT |
277 | | |
278 | | /* Import a curve448 public key from a byte array. |
279 | | * Public key encoded in big-endian. |
280 | | * |
281 | | * in [in] Array holding public key. |
282 | | * inLen [in] Number of bytes of data in array. |
283 | | * key [in] Curve448 public key. |
284 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
285 | | * ECC_BAD_ARG_E when inLen is less than CURVE448_PUB_KEY_SIZE, |
286 | | * 0 otherwise. |
287 | | */ |
288 | | int wc_curve448_import_public(const byte* in, word32 inLen, curve448_key* key) |
289 | 0 | { |
290 | 0 | return wc_curve448_import_public_ex(in, inLen, key, EC448_BIG_ENDIAN); |
291 | 0 | } |
292 | | |
293 | | /* Import a curve448 public key from a byte array. |
294 | | * |
295 | | * in [in] Array holding public key. |
296 | | * inLen [in] Number of bytes of data in array. |
297 | | * key [in] Curve448 public key. |
298 | | * endian [in] Endianness of encoded number in byte array. |
299 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
300 | | * ECC_BAD_ARG_E when inLen is less than CURVE448_PUB_KEY_SIZE, |
301 | | * 0 otherwise. |
302 | | */ |
303 | | int wc_curve448_import_public_ex(const byte* in, word32 inLen, |
304 | | curve448_key* key, int endian) |
305 | 0 | { |
306 | 0 | int ret = 0; |
307 | | |
308 | | /* sanity check */ |
309 | 0 | if ((key == NULL) || (in == NULL)) { |
310 | 0 | ret = BAD_FUNC_ARG; |
311 | 0 | } |
312 | | |
313 | | /* check size of incoming keys */ |
314 | 0 | if ((ret == 0) && (inLen != CURVE448_PUB_KEY_SIZE)) { |
315 | 0 | ret = ECC_BAD_ARG_E; |
316 | 0 | } |
317 | |
|
318 | 0 | if (ret == 0) { |
319 | 0 | if (endian == EC448_BIG_ENDIAN) { |
320 | 0 | int i; |
321 | | /* read keys in Big Endian format */ |
322 | 0 | for (i = 0; i < CURVE448_PUB_KEY_SIZE; i++) { |
323 | 0 | key->p[i] = in[CURVE448_PUB_KEY_SIZE - i - 1]; |
324 | 0 | } |
325 | 0 | } |
326 | 0 | else |
327 | 0 | XMEMCPY(key->p, in, inLen); |
328 | 0 | key->pubSet = 1; |
329 | 0 | } |
330 | |
|
331 | 0 | return ret; |
332 | 0 | } |
333 | | |
334 | | /* Check the public key value (big or little endian) |
335 | | * |
336 | | * pub [in] Public key bytes. |
337 | | * pubSz [in] Size of public key in bytes. |
338 | | * endian [in] Public key bytes passed in as big-endian or little-endian. |
339 | | * returns BAD_FUNC_ARGS when pub is NULL, |
340 | | * ECC_BAD_ARG_E when key length is not 56 bytes, public key value is |
341 | | * zero or one; |
342 | | * BUFFER_E when size of public key is zero; |
343 | | * 0 otherwise. |
344 | | */ |
345 | | int wc_curve448_check_public(const byte* pub, word32 pubSz, int endian) |
346 | 3 | { |
347 | 3 | int ret = 0; |
348 | | |
349 | 3 | if (pub == NULL) { |
350 | 0 | ret = BAD_FUNC_ARG; |
351 | 0 | } |
352 | | |
353 | | /* Check for empty key data */ |
354 | 3 | if ((ret == 0) && (pubSz == 0)) { |
355 | 0 | ret = BUFFER_E; |
356 | 0 | } |
357 | | |
358 | | /* Check key length */ |
359 | 3 | if ((ret == 0) && (pubSz != CURVE448_PUB_KEY_SIZE)) { |
360 | 0 | ret = ECC_BAD_ARG_E; |
361 | 0 | } |
362 | | |
363 | 3 | if (ret == 0) { |
364 | 3 | word32 i; |
365 | | |
366 | 3 | if (endian == EC448_LITTLE_ENDIAN) { |
367 | | /* Check for value of zero or one */ |
368 | 0 | for (i = CURVE448_PUB_KEY_SIZE - 1; i > 0; i--) { |
369 | 0 | if (pub[i] != 0) { |
370 | 0 | break; |
371 | 0 | } |
372 | 0 | } |
373 | 0 | if ((i == 0) && (pub[0] == 0 || pub[0] == 1)) { |
374 | 0 | return ECC_BAD_ARG_E; |
375 | 0 | } |
376 | | /* Check for order-1 or higher */ |
377 | 0 | for (i = CURVE448_PUB_KEY_SIZE - 1; i > 28; i--) { |
378 | 0 | if (pub[i] != 0xff) { |
379 | 0 | break; |
380 | 0 | } |
381 | 0 | } |
382 | 0 | if ((i == 28) && (pub[i] == 0xff)) { |
383 | 0 | return ECC_BAD_ARG_E; |
384 | 0 | } |
385 | 0 | if ((i == 28) && (pub[i] == 0xfe)) { |
386 | 0 | for (--i; i > 0; i--) { |
387 | 0 | if (pub[i] != 0xff) { |
388 | 0 | break; |
389 | 0 | } |
390 | 0 | } |
391 | 0 | if ((i == 0) && (pub[i] >= 0xfe)) { |
392 | 0 | return ECC_BAD_ARG_E; |
393 | 0 | } |
394 | 0 | } |
395 | 0 | } |
396 | 3 | else { |
397 | | /* Check for value of zero or one */ |
398 | 3 | for (i = 0; i < CURVE448_PUB_KEY_SIZE-1; i++) { |
399 | 3 | if (pub[i] != 0) { |
400 | 3 | break; |
401 | 3 | } |
402 | 3 | } |
403 | 3 | if ((i == CURVE448_PUB_KEY_SIZE - 1) && |
404 | 3 | (pub[i] == 0 || pub[i] == 1)) { |
405 | 0 | ret = ECC_BAD_ARG_E; |
406 | 0 | } |
407 | | /* Check for order-1 or higher */ |
408 | 3 | for (i = 0; i < 27; i++) { |
409 | 3 | if (pub[i] != 0xff) { |
410 | 3 | break; |
411 | 3 | } |
412 | 3 | } |
413 | 3 | if ((i == 27) && (pub[i] == 0xff)) { |
414 | 0 | return ECC_BAD_ARG_E; |
415 | 0 | } |
416 | 3 | if ((i == 27) && (pub[i] == 0xfe)) { |
417 | 0 | for (++i; i < CURVE448_PUB_KEY_SIZE - 1; i--) { |
418 | 0 | if (pub[i] != 0xff) { |
419 | 0 | break; |
420 | 0 | } |
421 | 0 | } |
422 | 0 | if ((i == CURVE448_PUB_KEY_SIZE) && (pub[i] >= 0xfe)) { |
423 | 0 | return ECC_BAD_ARG_E; |
424 | 0 | } |
425 | 0 | } |
426 | 3 | } |
427 | 3 | } |
428 | | |
429 | 3 | return ret; |
430 | 3 | } |
431 | | |
432 | | #endif /* HAVE_CURVE448_KEY_IMPORT */ |
433 | | |
434 | | |
435 | | #ifdef HAVE_CURVE448_KEY_EXPORT |
436 | | |
437 | | /* Export the curve448 private key raw form. |
438 | | * Private key encoded big-endian. |
439 | | * |
440 | | * key [in] Curve448 private key. |
441 | | * out [in] Array to hold private key. |
442 | | * outLen [in/out] On in, the number of bytes in array. |
443 | | * On out, the number bytes put into array. |
444 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
445 | | * ECC_BAD_ARG_E when outLen is less than CURVE448_KEY_SIZE, |
446 | | * 0 otherwise. |
447 | | */ |
448 | | int wc_curve448_export_private_raw(curve448_key* key, byte* out, word32* outLen) |
449 | 0 | { |
450 | 0 | return wc_curve448_export_private_raw_ex(key, out, outLen, |
451 | 0 | EC448_BIG_ENDIAN); |
452 | 0 | } |
453 | | |
454 | | /* Export the curve448 private key raw form. |
455 | | * |
456 | | * key [in] Curve448 private key. |
457 | | * out [in] Array to hold private key. |
458 | | * outLen [in/out] On in, the number of bytes in array. |
459 | | * On out, the number bytes put into array. |
460 | | * endian [in] Endianness to use when encoding number in array. |
461 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
462 | | * ECC_BAD_ARG_E when outLen is less than CURVE448_KEY_SIZE, |
463 | | * 0 otherwise. |
464 | | */ |
465 | | int wc_curve448_export_private_raw_ex(curve448_key* key, byte* out, |
466 | | word32* outLen, int endian) |
467 | 3 | { |
468 | 3 | int ret = 0; |
469 | | |
470 | | /* sanity check */ |
471 | 3 | if ((key == NULL) || (out == NULL) || (outLen == NULL)) { |
472 | 0 | ret = BAD_FUNC_ARG; |
473 | 0 | } |
474 | | |
475 | | /* check size of outgoing buffer */ |
476 | 3 | if ((ret == 0) && (*outLen < CURVE448_KEY_SIZE)) { |
477 | 0 | *outLen = CURVE448_KEY_SIZE; |
478 | 0 | ret = ECC_BAD_ARG_E; |
479 | 0 | } |
480 | 3 | if (ret == 0) { |
481 | 3 | *outLen = CURVE448_KEY_SIZE; |
482 | | |
483 | 3 | if (endian == EC448_BIG_ENDIAN) { |
484 | 0 | int i; |
485 | | /* put the key in Big Endian format */ |
486 | 0 | for (i = 0; i < CURVE448_KEY_SIZE; i++) { |
487 | 0 | out[i] = key->k[CURVE448_KEY_SIZE - i - 1]; |
488 | 0 | } |
489 | 0 | } |
490 | 3 | else { |
491 | 3 | XMEMCPY(out, key->k, CURVE448_KEY_SIZE); |
492 | 3 | } |
493 | 3 | } |
494 | | |
495 | 3 | return ret; |
496 | 3 | } |
497 | | |
498 | | /* Export the curve448 private and public keys in raw form. |
499 | | * Private and public key encoded big-endian. |
500 | | * |
501 | | * key [in] Curve448 private key. |
502 | | * priv [in] Array to hold private key. |
503 | | * privSz [in/out] On in, the number of bytes in private key array. |
504 | | * On out, the number bytes put into private key array. |
505 | | * pub [in] Array to hold public key. |
506 | | * pubSz [in/out] On in, the number of bytes in public key array. |
507 | | * On out, the number bytes put into public key array. |
508 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
509 | | * ECC_BAD_ARG_E when privSz is less than CURVE448_KEY_SIZE or pubSz is |
510 | | * less than CURVE448_PUB_KEY_SIZE, |
511 | | * 0 otherwise. |
512 | | */ |
513 | | int wc_curve448_export_key_raw(curve448_key* key, byte* priv, word32 *privSz, |
514 | | byte* pub, word32 *pubSz) |
515 | 0 | { |
516 | 0 | return wc_curve448_export_key_raw_ex(key, priv, privSz, pub, pubSz, |
517 | 0 | EC448_BIG_ENDIAN); |
518 | 0 | } |
519 | | |
520 | | /* Export the curve448 private and public keys in raw form. |
521 | | * |
522 | | * key [in] Curve448 private key. |
523 | | * priv [in] Array to hold private key. |
524 | | * privSz [in/out] On in, the number of bytes in private key array. |
525 | | * On out, the number bytes put into private key array. |
526 | | * pub [in] Array to hold public key. |
527 | | * pubSz [in/out] On in, the number of bytes in public key array. |
528 | | * On out, the number bytes put into public key array. |
529 | | * endian [in] Endianness to use when encoding number in array. |
530 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
531 | | * ECC_BAD_ARG_E when privSz is less than CURVE448_KEY_SIZE or pubSz is |
532 | | * less than CURVE448_PUB_KEY_SIZE, |
533 | | * 0 otherwise. |
534 | | */ |
535 | | int wc_curve448_export_key_raw_ex(curve448_key* key, byte* priv, word32 *privSz, |
536 | | byte* pub, word32 *pubSz, int endian) |
537 | 0 | { |
538 | 0 | int ret; |
539 | | |
540 | | /* export private part */ |
541 | 0 | ret = wc_curve448_export_private_raw_ex(key, priv, privSz, endian); |
542 | 0 | if (ret == 0) { |
543 | | /* export public part */ |
544 | 0 | ret = wc_curve448_export_public_ex(key, pub, pubSz, endian); |
545 | 0 | } |
546 | |
|
547 | 0 | return ret; |
548 | 0 | } |
549 | | |
550 | | #endif /* HAVE_CURVE448_KEY_EXPORT */ |
551 | | |
552 | | #ifdef HAVE_CURVE448_KEY_IMPORT |
553 | | |
554 | | /* Import curve448 private and public keys from a byte arrays. |
555 | | * Private and public keys encoded in big-endian. |
556 | | * |
557 | | * piv [in] Array holding private key. |
558 | | * privSz [in] Number of bytes of data in private key array. |
559 | | * pub [in] Array holding public key. |
560 | | * pubSz [in] Number of bytes of data in public key array. |
561 | | * key [in] Curve448 private/public key. |
562 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
563 | | * ECC_BAD_ARG_E when privSz is less than CURVE448_KEY_SIZE or pubSz is |
564 | | * less than CURVE448_PUB_KEY_SIZE, |
565 | | * 0 otherwise. |
566 | | */ |
567 | | int wc_curve448_import_private_raw(const byte* priv, word32 privSz, |
568 | | const byte* pub, word32 pubSz, |
569 | | curve448_key* key) |
570 | 0 | { |
571 | 0 | return wc_curve448_import_private_raw_ex(priv, privSz, pub, pubSz, key, |
572 | 0 | EC448_BIG_ENDIAN); |
573 | 0 | } |
574 | | |
575 | | /* Import curve448 private and public keys from a byte arrays. |
576 | | * |
577 | | * piv [in] Array holding private key. |
578 | | * privSz [in] Number of bytes of data in private key array. |
579 | | * pub [in] Array holding public key. |
580 | | * pubSz [in] Number of bytes of data in public key array. |
581 | | * key [in] Curve448 private/public key. |
582 | | * endian [in] Endianness of encoded numbers in byte arrays. |
583 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
584 | | * ECC_BAD_ARG_E when privSz is less than CURVE448_KEY_SIZE or pubSz is |
585 | | * less than CURVE448_PUB_KEY_SIZE, |
586 | | * 0 otherwise. |
587 | | */ |
588 | | int wc_curve448_import_private_raw_ex(const byte* priv, word32 privSz, |
589 | | const byte* pub, word32 pubSz, |
590 | | curve448_key* key, int endian) |
591 | 0 | { |
592 | 0 | int ret; |
593 | | |
594 | | /* import private part */ |
595 | 0 | ret = wc_curve448_import_private_ex(priv, privSz, key, endian); |
596 | 0 | if (ret == 0) { |
597 | | /* import public part */ |
598 | 0 | return wc_curve448_import_public_ex(pub, pubSz, key, endian); |
599 | 0 | } |
600 | | |
601 | 0 | return ret; |
602 | 0 | } |
603 | | |
604 | | /* Import curve448 private key from a byte array. |
605 | | * Private key encoded in big-endian. |
606 | | * |
607 | | * piv [in] Array holding private key. |
608 | | * privSz [in] Number of bytes of data in private key array. |
609 | | * key [in] Curve448 private/public key. |
610 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
611 | | * ECC_BAD_ARG_E when privSz is less than CURVE448_KEY_SIZE, |
612 | | * 0 otherwise. |
613 | | */ |
614 | | int wc_curve448_import_private(const byte* priv, word32 privSz, |
615 | | curve448_key* key) |
616 | 0 | { |
617 | 0 | return wc_curve448_import_private_ex(priv, privSz, key, EC448_BIG_ENDIAN); |
618 | 0 | } |
619 | | |
620 | | /* Import curve448 private key from a byte array. |
621 | | * |
622 | | * piv [in] Array holding private key. |
623 | | * privSz [in] Number of bytes of data in private key array. |
624 | | * key [in] Curve448 private/public key. |
625 | | * endian [in] Endianness of encoded number in byte array. |
626 | | * returns BAD_FUNC_ARG when a parameter is NULL, |
627 | | * ECC_BAD_ARG_E when privSz is less than CURVE448_KEY_SIZE, |
628 | | * 0 otherwise. |
629 | | */ |
630 | | int wc_curve448_import_private_ex(const byte* priv, word32 privSz, |
631 | | curve448_key* key, int endian) |
632 | 0 | { |
633 | 0 | int ret = 0; |
634 | | |
635 | | /* sanity check */ |
636 | 0 | if ((key == NULL) || (priv == NULL)) { |
637 | 0 | ret = BAD_FUNC_ARG; |
638 | 0 | } |
639 | | |
640 | | /* check size of incoming keys */ |
641 | 0 | if ((ret == 0) && ((int)privSz != CURVE448_KEY_SIZE)) { |
642 | 0 | ret = ECC_BAD_ARG_E; |
643 | 0 | } |
644 | |
|
645 | 0 | if (ret == 0) { |
646 | 0 | if (endian == EC448_BIG_ENDIAN) { |
647 | 0 | int i; |
648 | | /* read the key in Big Endian format */ |
649 | 0 | for (i = 0; i < CURVE448_KEY_SIZE; i++) { |
650 | 0 | key->k[i] = priv[CURVE448_KEY_SIZE - i - 1]; |
651 | 0 | } |
652 | 0 | } |
653 | 0 | else { |
654 | 0 | XMEMCPY(key->k, priv, CURVE448_KEY_SIZE); |
655 | 0 | } |
656 | | |
657 | | /* Clamp the key */ |
658 | 0 | key->k[0] &= 0xfc; |
659 | 0 | key->k[CURVE448_KEY_SIZE-1] |= 0x80; |
660 | |
|
661 | 0 | key->privSet = 1; |
662 | 0 | } |
663 | |
|
664 | 0 | return ret; |
665 | 0 | } |
666 | | |
667 | | #endif /* HAVE_CURVE448_KEY_IMPORT */ |
668 | | |
669 | | |
670 | | /* Initialize the curve448 key. |
671 | | * |
672 | | * key [in] Curve448 key object. |
673 | | * returns BAD_FUNC_ARG when key is NULL, |
674 | | * 0 otherwise. |
675 | | */ |
676 | | int wc_curve448_init(curve448_key* key) |
677 | 3 | { |
678 | 3 | int ret = 0; |
679 | | |
680 | 3 | if (key == NULL) { |
681 | 0 | ret = BAD_FUNC_ARG; |
682 | 0 | } |
683 | | |
684 | 3 | if (ret == 0) { |
685 | 3 | XMEMSET(key, 0, sizeof(*key)); |
686 | | |
687 | 3 | fe448_init(); |
688 | | |
689 | | #ifdef WOLFSSL_CHECK_MEM_ZERO |
690 | | wc_MemZero_Add("wc_curve448_init key->k", &key->k, CURVE448_KEY_SIZE); |
691 | | #endif |
692 | 3 | } |
693 | | |
694 | 3 | return ret; |
695 | 3 | } |
696 | | |
697 | | |
698 | | /* Clears the curve448 key data. |
699 | | * |
700 | | * key [in] Curve448 key object. |
701 | | */ |
702 | | void wc_curve448_free(curve448_key* key) |
703 | 3 | { |
704 | 3 | if (key != NULL) { |
705 | 3 | ForceZero(key->k, sizeof(key->k)); |
706 | 3 | XMEMSET(key->p, 0, sizeof(key->p)); |
707 | 3 | key->pubSet = 0; |
708 | 3 | key->privSet = 0; |
709 | | #ifdef WOLFSSL_CHECK_MEM_ZERO |
710 | | wc_MemZero_Check(key, sizeof(curve448_key)); |
711 | | #endif |
712 | 3 | } |
713 | 3 | } |
714 | | |
715 | | |
716 | | /* Get the curve448 key's size. |
717 | | * |
718 | | * key [in] Curve448 key object. |
719 | | * returns 0 if key is NULL, |
720 | | * CURVE448_KEY_SIZE otherwise. |
721 | | */ |
722 | | int wc_curve448_size(curve448_key* key) |
723 | 0 | { |
724 | 0 | int ret = 0; |
725 | |
|
726 | 0 | if (key != NULL) { |
727 | 0 | ret = CURVE448_KEY_SIZE; |
728 | 0 | } |
729 | |
|
730 | 0 | return ret; |
731 | 0 | } |
732 | | |
733 | | #endif /* HAVE_CURVE448 */ |
734 | | |