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b1ceb439 TS |
1 | /* |
2 | * Copyright 2018 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the OpenSSL license (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
10 | #include <string.h> | |
11 | #include <stdlib.h> | |
12 | #include <openssl/crypto.h> | |
459b15d4 | 13 | #include <openssl/evp.h> |
776796e8 RL |
14 | #include <openssl/core_names.h> |
15 | #include <openssl/params.h> | |
25f2138b DMSP |
16 | #include "crypto/modes.h" |
17 | #include "crypto/siv.h" | |
b1ceb439 TS |
18 | |
19 | #ifndef OPENSSL_NO_SIV | |
20 | ||
21 | __owur static ossl_inline uint32_t rotl8(uint32_t x) | |
22 | { | |
23 | return (x << 8) | (x >> 24); | |
24 | } | |
25 | ||
26 | __owur static ossl_inline uint32_t rotr8(uint32_t x) | |
27 | { | |
28 | return (x >> 8) | (x << 24); | |
29 | } | |
30 | ||
31 | __owur static ossl_inline uint64_t byteswap8(uint64_t x) | |
32 | { | |
33 | uint32_t high = (uint32_t)(x >> 32); | |
34 | uint32_t low = (uint32_t)x; | |
35 | ||
36 | high = (rotl8(high) & 0x00ff00ff) | (rotr8(high) & 0xff00ff00); | |
37 | low = (rotl8(low) & 0x00ff00ff) | (rotr8(low) & 0xff00ff00); | |
38 | return ((uint64_t)low) << 32 | (uint64_t)high; | |
39 | } | |
40 | ||
41 | __owur static ossl_inline uint64_t siv128_getword(SIV_BLOCK const *b, size_t i) | |
42 | { | |
43 | const union { | |
44 | long one; | |
45 | char little; | |
46 | } is_endian = { 1 }; | |
47 | ||
48 | if (is_endian.little) | |
49 | return byteswap8(b->word[i]); | |
50 | return b->word[i]; | |
51 | } | |
52 | ||
53 | static ossl_inline void siv128_putword(SIV_BLOCK *b, size_t i, uint64_t x) | |
54 | { | |
55 | const union { | |
56 | long one; | |
57 | char little; | |
58 | } is_endian = { 1 }; | |
59 | ||
60 | if (is_endian.little) | |
61 | b->word[i] = byteswap8(x); | |
62 | else | |
63 | b->word[i] = x; | |
64 | } | |
65 | ||
66 | static ossl_inline void siv128_xorblock(SIV_BLOCK *x, | |
67 | SIV_BLOCK const *y) | |
68 | { | |
69 | x->word[0] ^= y->word[0]; | |
70 | x->word[1] ^= y->word[1]; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Doubles |b|, which is 16 bytes representing an element | |
75 | * of GF(2**128) modulo the irreducible polynomial | |
76 | * x**128 + x**7 + x**2 + x + 1. | |
77 | * Assumes two's-complement arithmetic | |
78 | */ | |
79 | static ossl_inline void siv128_dbl(SIV_BLOCK *b) | |
80 | { | |
81 | uint64_t high = siv128_getword(b, 0); | |
82 | uint64_t low = siv128_getword(b, 1); | |
83 | uint64_t high_carry = high & (((uint64_t)1) << 63); | |
84 | uint64_t low_carry = low & (((uint64_t)1) << 63); | |
85 | int64_t low_mask = -((int64_t)(high_carry >> 63)) & 0x87; | |
86 | uint64_t high_mask = low_carry >> 63; | |
87 | ||
88 | high = (high << 1) | high_mask; | |
89 | low = (low << 1) ^ (uint64_t)low_mask; | |
90 | siv128_putword(b, 0, high); | |
91 | siv128_putword(b, 1, low); | |
92 | } | |
93 | ||
94 | __owur static ossl_inline int siv128_do_s2v_p(SIV128_CONTEXT *ctx, SIV_BLOCK *out, | |
95 | unsigned char const* in, size_t len) | |
96 | { | |
97 | SIV_BLOCK t; | |
98 | size_t out_len = sizeof(out->byte); | |
be5fc053 KR |
99 | EVP_MAC_CTX *mac_ctx; |
100 | int ret = 0; | |
b1ceb439 | 101 | |
be5fc053 KR |
102 | mac_ctx = EVP_MAC_CTX_dup(ctx->mac_ctx_init); |
103 | if (mac_ctx == NULL) | |
b1ceb439 TS |
104 | return 0; |
105 | ||
106 | if (len >= SIV_LEN) { | |
be5fc053 KR |
107 | if (!EVP_MAC_update(mac_ctx, in, len - SIV_LEN)) |
108 | goto err; | |
b1ceb439 TS |
109 | memcpy(&t, in + (len-SIV_LEN), SIV_LEN); |
110 | siv128_xorblock(&t, &ctx->d); | |
be5fc053 KR |
111 | if (!EVP_MAC_update(mac_ctx, t.byte, SIV_LEN)) |
112 | goto err; | |
b1ceb439 TS |
113 | } else { |
114 | memset(&t, 0, sizeof(t)); | |
115 | memcpy(&t, in, len); | |
116 | t.byte[len] = 0x80; | |
117 | siv128_dbl(&ctx->d); | |
118 | siv128_xorblock(&t, &ctx->d); | |
be5fc053 KR |
119 | if (!EVP_MAC_update(mac_ctx, t.byte, SIV_LEN)) |
120 | goto err; | |
b1ceb439 | 121 | } |
776796e8 | 122 | if (!EVP_MAC_final(mac_ctx, out->byte, &out_len, sizeof(out->byte)) |
b1ceb439 | 123 | || out_len != SIV_LEN) |
be5fc053 KR |
124 | goto err; |
125 | ||
126 | ret = 1; | |
127 | ||
128 | err: | |
129 | EVP_MAC_CTX_free(mac_ctx); | |
130 | return ret; | |
b1ceb439 TS |
131 | } |
132 | ||
133 | ||
134 | __owur static ossl_inline int siv128_do_encrypt(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
135 | unsigned char const *in, size_t len, | |
136 | SIV_BLOCK *icv) | |
137 | { | |
138 | int out_len = (int)len; | |
139 | ||
140 | if (!EVP_CipherInit_ex(ctx, NULL, NULL, NULL, icv->byte, 1)) | |
141 | return 0; | |
142 | return EVP_EncryptUpdate(ctx, out, &out_len, in, out_len); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Create a new SIV128_CONTEXT | |
147 | */ | |
148 | SIV128_CONTEXT *CRYPTO_siv128_new(const unsigned char *key, int klen, EVP_CIPHER* cbc, EVP_CIPHER* ctr) | |
149 | { | |
150 | SIV128_CONTEXT *ctx; | |
151 | int ret; | |
152 | ||
153 | if ((ctx = OPENSSL_malloc(sizeof(*ctx))) != NULL) { | |
154 | ret = CRYPTO_siv128_init(ctx, key, klen, cbc, ctr); | |
155 | if (ret) | |
156 | return ctx; | |
157 | OPENSSL_free(ctx); | |
158 | } | |
159 | ||
160 | return NULL; | |
161 | } | |
162 | ||
163 | /* | |
164 | * Initialise an existing SIV128_CONTEXT | |
165 | */ | |
166 | int CRYPTO_siv128_init(SIV128_CONTEXT *ctx, const unsigned char *key, int klen, | |
167 | const EVP_CIPHER* cbc, const EVP_CIPHER* ctr) | |
168 | { | |
169 | static const unsigned char zero[SIV_LEN] = { 0 }; | |
170 | size_t out_len = SIV_LEN; | |
be5fc053 | 171 | EVP_MAC_CTX *mac_ctx = NULL; |
776796e8 RL |
172 | OSSL_PARAM params[3]; |
173 | const char *cbc_name = EVP_CIPHER_name(cbc); | |
174 | ||
703170d4 | 175 | params[0] = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_CIPHER, |
7f588d20 | 176 | (char *)cbc_name, 0); |
776796e8 RL |
177 | params[1] = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, |
178 | (void *)key, klen); | |
179 | params[2] = OSSL_PARAM_construct_end(); | |
b1ceb439 TS |
180 | |
181 | memset(&ctx->d, 0, sizeof(ctx->d)); | |
182 | ctx->cipher_ctx = NULL; | |
9a3b5b76 | 183 | ctx->mac_ctx_init = NULL; |
b1ceb439 TS |
184 | |
185 | if (key == NULL || cbc == NULL || ctr == NULL | |
186 | || (ctx->cipher_ctx = EVP_CIPHER_CTX_new()) == NULL | |
776796e8 | 187 | /* TODO(3.0) library context */ |
81ff9eeb RL |
188 | || (ctx->mac = |
189 | EVP_MAC_fetch(NULL, OSSL_MAC_NAME_CMAC, NULL)) == NULL | |
776796e8 RL |
190 | || (ctx->mac_ctx_init = EVP_MAC_CTX_new(ctx->mac)) == NULL |
191 | || !EVP_MAC_CTX_set_params(ctx->mac_ctx_init, params) | |
b1ceb439 | 192 | || !EVP_EncryptInit_ex(ctx->cipher_ctx, ctr, NULL, key + klen, NULL) |
be5fc053 KR |
193 | || (mac_ctx = EVP_MAC_CTX_dup(ctx->mac_ctx_init)) == NULL |
194 | || !EVP_MAC_update(mac_ctx, zero, sizeof(zero)) | |
776796e8 RL |
195 | || !EVP_MAC_final(mac_ctx, ctx->d.byte, &out_len, |
196 | sizeof(ctx->d.byte))) { | |
b1ceb439 | 197 | EVP_CIPHER_CTX_free(ctx->cipher_ctx); |
9a3b5b76 | 198 | EVP_MAC_CTX_free(ctx->mac_ctx_init); |
be5fc053 | 199 | EVP_MAC_CTX_free(mac_ctx); |
776796e8 | 200 | EVP_MAC_free(ctx->mac); |
b1ceb439 TS |
201 | return 0; |
202 | } | |
be5fc053 | 203 | EVP_MAC_CTX_free(mac_ctx); |
b1ceb439 TS |
204 | |
205 | ctx->final_ret = -1; | |
206 | ctx->crypto_ok = 1; | |
207 | ||
208 | return 1; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Copy an SIV128_CONTEXT object | |
213 | */ | |
214 | int CRYPTO_siv128_copy_ctx(SIV128_CONTEXT *dest, SIV128_CONTEXT *src) | |
215 | { | |
216 | memcpy(&dest->d, &src->d, sizeof(src->d)); | |
217 | if (!EVP_CIPHER_CTX_copy(dest->cipher_ctx, src->cipher_ctx)) | |
218 | return 0; | |
be5fc053 KR |
219 | EVP_MAC_CTX_free(dest->mac_ctx_init); |
220 | dest->mac_ctx_init = EVP_MAC_CTX_dup(src->mac_ctx_init); | |
221 | if (dest->mac_ctx_init == NULL) | |
b1ceb439 | 222 | return 0; |
b1ceb439 TS |
223 | return 1; |
224 | } | |
225 | ||
226 | /* | |
227 | * Provide any AAD. This can be called multiple times. | |
228 | * Per RFC5297, the last piece of associated data | |
229 | * is the nonce, but it's not treated special | |
230 | */ | |
231 | int CRYPTO_siv128_aad(SIV128_CONTEXT *ctx, const unsigned char *aad, | |
232 | size_t len) | |
233 | { | |
9a3b5b76 | 234 | SIV_BLOCK mac_out; |
b1ceb439 | 235 | size_t out_len = SIV_LEN; |
be5fc053 | 236 | EVP_MAC_CTX *mac_ctx; |
b1ceb439 TS |
237 | |
238 | siv128_dbl(&ctx->d); | |
239 | ||
776796e8 | 240 | if ((mac_ctx = EVP_MAC_CTX_dup(ctx->mac_ctx_init)) == NULL |
be5fc053 | 241 | || !EVP_MAC_update(mac_ctx, aad, len) |
776796e8 RL |
242 | || !EVP_MAC_final(mac_ctx, mac_out.byte, &out_len, |
243 | sizeof(mac_out.byte)) | |
be5fc053 KR |
244 | || out_len != SIV_LEN) { |
245 | EVP_MAC_CTX_free(mac_ctx); | |
b1ceb439 | 246 | return 0; |
be5fc053 KR |
247 | } |
248 | EVP_MAC_CTX_free(mac_ctx); | |
b1ceb439 | 249 | |
9a3b5b76 | 250 | siv128_xorblock(&ctx->d, &mac_out); |
b1ceb439 TS |
251 | |
252 | return 1; | |
b1ceb439 TS |
253 | } |
254 | ||
255 | /* | |
256 | * Provide any data to be encrypted. This can be called once. | |
257 | */ | |
258 | int CRYPTO_siv128_encrypt(SIV128_CONTEXT *ctx, | |
259 | const unsigned char *in, unsigned char *out, | |
260 | size_t len) | |
261 | { | |
262 | SIV_BLOCK q; | |
263 | ||
264 | /* can only do one crypto operation */ | |
265 | if (ctx->crypto_ok == 0) | |
266 | return 0; | |
267 | ctx->crypto_ok--; | |
268 | ||
269 | if (!siv128_do_s2v_p(ctx, &q, in, len)) | |
270 | return 0; | |
271 | ||
272 | memcpy(ctx->tag.byte, &q, SIV_LEN); | |
273 | q.byte[8] &= 0x7f; | |
274 | q.byte[12] &= 0x7f; | |
275 | ||
276 | if (!siv128_do_encrypt(ctx->cipher_ctx, out, in, len, &q)) | |
277 | return 0; | |
278 | ctx->final_ret = 0; | |
279 | return len; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Provide any data to be decrypted. This can be called once. | |
284 | */ | |
285 | int CRYPTO_siv128_decrypt(SIV128_CONTEXT *ctx, | |
286 | const unsigned char *in, unsigned char *out, | |
287 | size_t len) | |
288 | { | |
289 | unsigned char* p; | |
290 | SIV_BLOCK t, q; | |
291 | int i; | |
292 | ||
293 | /* can only do one crypto operation */ | |
294 | if (ctx->crypto_ok == 0) | |
295 | return 0; | |
296 | ctx->crypto_ok--; | |
297 | ||
298 | memcpy(&q, ctx->tag.byte, SIV_LEN); | |
299 | q.byte[8] &= 0x7f; | |
300 | q.byte[12] &= 0x7f; | |
301 | ||
302 | if (!siv128_do_encrypt(ctx->cipher_ctx, out, in, len, &q) | |
303 | || !siv128_do_s2v_p(ctx, &t, out, len)) | |
304 | return 0; | |
305 | ||
306 | p = ctx->tag.byte; | |
307 | for (i = 0; i < SIV_LEN; i++) | |
308 | t.byte[i] ^= p[i]; | |
309 | ||
310 | if ((t.word[0] | t.word[1]) != 0) { | |
311 | OPENSSL_cleanse(out, len); | |
312 | return 0; | |
313 | } | |
314 | ctx->final_ret = 0; | |
315 | return len; | |
316 | } | |
317 | ||
318 | /* | |
319 | * Return the already calculated final result. | |
320 | */ | |
321 | int CRYPTO_siv128_finish(SIV128_CONTEXT *ctx) | |
322 | { | |
323 | return ctx->final_ret; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Set the tag | |
328 | */ | |
329 | int CRYPTO_siv128_set_tag(SIV128_CONTEXT *ctx, const unsigned char *tag, size_t len) | |
330 | { | |
331 | if (len != SIV_LEN) | |
332 | return 0; | |
333 | ||
334 | /* Copy the tag from the supplied buffer */ | |
335 | memcpy(ctx->tag.byte, tag, len); | |
336 | return 1; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Retrieve the calculated tag | |
341 | */ | |
342 | int CRYPTO_siv128_get_tag(SIV128_CONTEXT *ctx, unsigned char *tag, size_t len) | |
343 | { | |
344 | if (len != SIV_LEN) | |
345 | return 0; | |
346 | ||
347 | /* Copy the tag into the supplied buffer */ | |
348 | memcpy(tag, ctx->tag.byte, len); | |
349 | return 1; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Release all resources | |
354 | */ | |
355 | int CRYPTO_siv128_cleanup(SIV128_CONTEXT *ctx) | |
356 | { | |
357 | if (ctx != NULL) { | |
358 | EVP_CIPHER_CTX_free(ctx->cipher_ctx); | |
359 | ctx->cipher_ctx = NULL; | |
9a3b5b76 TS |
360 | EVP_MAC_CTX_free(ctx->mac_ctx_init); |
361 | ctx->mac_ctx_init = NULL; | |
776796e8 RL |
362 | EVP_MAC_free(ctx->mac); |
363 | ctx->mac = NULL; | |
b1ceb439 TS |
364 | OPENSSL_cleanse(&ctx->d, sizeof(ctx->d)); |
365 | OPENSSL_cleanse(&ctx->tag, sizeof(ctx->tag)); | |
366 | ctx->final_ret = -1; | |
367 | ctx->crypto_ok = 1; | |
368 | } | |
369 | return 1; | |
370 | } | |
371 | ||
372 | int CRYPTO_siv128_speed(SIV128_CONTEXT *ctx, int arg) | |
373 | { | |
374 | ctx->crypto_ok = (arg == 1) ? -1 : 1; | |
375 | return 1; | |
376 | } | |
377 | ||
378 | #endif /* OPENSSL_NO_SIV */ |