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sha256.c 15 KB

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  1. /***************************************************************************
  2. * _ _ ____ _
  3. * Project ___| | | | _ \| |
  4. * / __| | | | |_) | |
  5. * | (__| |_| | _ <| |___
  6. * \___|\___/|_| \_\_____|
  7. *
  8. * Copyright (C) Florin Petriuc, <petriuc.florin@gmail.com>
  9. * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
  10. *
  11. * This software is licensed as described in the file COPYING, which
  12. * you should have received as part of this distribution. The terms
  13. * are also available at https://curl.se/docs/copyright.html.
  14. *
  15. * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  16. * copies of the Software, and permit persons to whom the Software is
  17. * furnished to do so, under the terms of the COPYING file.
  18. *
  19. * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20. * KIND, either express or implied.
  21. *
  22. * SPDX-License-Identifier: curl
  23. *
  24. ***************************************************************************/
  25. #include "curl_setup.h"
  26. #ifndef CURL_DISABLE_CRYPTO_AUTH
  27. #include "warnless.h"
  28. #include "curl_sha256.h"
  29. #include "curl_hmac.h"
  30. #ifdef USE_WOLFSSL
  31. #include <wolfssl/options.h>
  32. #ifndef NO_SHA256
  33. #define USE_OPENSSL_SHA256
  34. #endif
  35. #endif
  36. #if defined(USE_OPENSSL)
  37. #include <openssl/opensslv.h>
  38. #if (OPENSSL_VERSION_NUMBER >= 0x0090800fL)
  39. #define USE_OPENSSL_SHA256
  40. #endif
  41. #endif /* USE_OPENSSL */
  42. #ifdef USE_MBEDTLS
  43. #include <mbedtls/version.h>
  44. #if(MBEDTLS_VERSION_NUMBER >= 0x02070000) && \
  45. (MBEDTLS_VERSION_NUMBER < 0x03000000)
  46. #define HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS
  47. #endif
  48. #endif /* USE_MBEDTLS */
  49. #if defined(USE_OPENSSL_SHA256)
  50. /* When OpenSSL or wolfSSL is available we use their SHA256-functions. */
  51. #if defined(USE_OPENSSL)
  52. #include <openssl/evp.h>
  53. #elif defined(USE_WOLFSSL)
  54. #include <wolfssl/openssl/evp.h>
  55. #endif
  56. #elif defined(USE_GNUTLS)
  57. #include <nettle/sha.h>
  58. #elif defined(USE_MBEDTLS)
  59. #include <mbedtls/sha256.h>
  60. #elif (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && \
  61. (__MAC_OS_X_VERSION_MAX_ALLOWED >= 1040)) || \
  62. (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && \
  63. (__IPHONE_OS_VERSION_MAX_ALLOWED >= 20000))
  64. #include <CommonCrypto/CommonDigest.h>
  65. #define AN_APPLE_OS
  66. #elif defined(USE_WIN32_CRYPTO)
  67. #include <wincrypt.h>
  68. #endif
  69. /* The last 3 #include files should be in this order */
  70. #include "curl_printf.h"
  71. #include "curl_memory.h"
  72. #include "memdebug.h"
  73. /* Please keep the SSL backend-specific #if branches in this order:
  74. *
  75. * 1. USE_OPENSSL
  76. * 2. USE_GNUTLS
  77. * 3. USE_MBEDTLS
  78. * 4. USE_COMMON_CRYPTO
  79. * 5. USE_WIN32_CRYPTO
  80. *
  81. * This ensures that the same SSL branch gets activated throughout this source
  82. * file even if multiple backends are enabled at the same time.
  83. */
  84. #if defined(USE_OPENSSL_SHA256)
  85. struct sha256_ctx {
  86. EVP_MD_CTX *openssl_ctx;
  87. };
  88. typedef struct sha256_ctx my_sha256_ctx;
  89. static CURLcode my_sha256_init(my_sha256_ctx *ctx)
  90. {
  91. ctx->openssl_ctx = EVP_MD_CTX_create();
  92. if(!ctx->openssl_ctx)
  93. return CURLE_OUT_OF_MEMORY;
  94. EVP_DigestInit_ex(ctx->openssl_ctx, EVP_sha256(), NULL);
  95. return CURLE_OK;
  96. }
  97. static void my_sha256_update(my_sha256_ctx *ctx,
  98. const unsigned char *data,
  99. unsigned int length)
  100. {
  101. EVP_DigestUpdate(ctx->openssl_ctx, data, length);
  102. }
  103. static void my_sha256_final(unsigned char *digest, my_sha256_ctx *ctx)
  104. {
  105. EVP_DigestFinal_ex(ctx->openssl_ctx, digest, NULL);
  106. EVP_MD_CTX_destroy(ctx->openssl_ctx);
  107. }
  108. #elif defined(USE_GNUTLS)
  109. typedef struct sha256_ctx my_sha256_ctx;
  110. static CURLcode my_sha256_init(my_sha256_ctx *ctx)
  111. {
  112. sha256_init(ctx);
  113. return CURLE_OK;
  114. }
  115. static void my_sha256_update(my_sha256_ctx *ctx,
  116. const unsigned char *data,
  117. unsigned int length)
  118. {
  119. sha256_update(ctx, length, data);
  120. }
  121. static void my_sha256_final(unsigned char *digest, my_sha256_ctx *ctx)
  122. {
  123. sha256_digest(ctx, SHA256_DIGEST_SIZE, digest);
  124. }
  125. #elif defined(USE_MBEDTLS)
  126. typedef mbedtls_sha256_context my_sha256_ctx;
  127. static CURLcode my_sha256_init(my_sha256_ctx *ctx)
  128. {
  129. #if !defined(HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS)
  130. (void) mbedtls_sha256_starts(ctx, 0);
  131. #else
  132. (void) mbedtls_sha256_starts_ret(ctx, 0);
  133. #endif
  134. return CURLE_OK;
  135. }
  136. static void my_sha256_update(my_sha256_ctx *ctx,
  137. const unsigned char *data,
  138. unsigned int length)
  139. {
  140. #if !defined(HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS)
  141. (void) mbedtls_sha256_update(ctx, data, length);
  142. #else
  143. (void) mbedtls_sha256_update_ret(ctx, data, length);
  144. #endif
  145. }
  146. static void my_sha256_final(unsigned char *digest, my_sha256_ctx *ctx)
  147. {
  148. #if !defined(HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS)
  149. (void) mbedtls_sha256_finish(ctx, digest);
  150. #else
  151. (void) mbedtls_sha256_finish_ret(ctx, digest);
  152. #endif
  153. }
  154. #elif defined(AN_APPLE_OS)
  155. typedef CC_SHA256_CTX my_sha256_ctx;
  156. static CURLcode my_sha256_init(my_sha256_ctx *ctx)
  157. {
  158. (void) CC_SHA256_Init(ctx);
  159. return CURLE_OK;
  160. }
  161. static void my_sha256_update(my_sha256_ctx *ctx,
  162. const unsigned char *data,
  163. unsigned int length)
  164. {
  165. (void) CC_SHA256_Update(ctx, data, length);
  166. }
  167. static void my_sha256_final(unsigned char *digest, my_sha256_ctx *ctx)
  168. {
  169. (void) CC_SHA256_Final(digest, ctx);
  170. }
  171. #elif defined(USE_WIN32_CRYPTO)
  172. struct sha256_ctx {
  173. HCRYPTPROV hCryptProv;
  174. HCRYPTHASH hHash;
  175. };
  176. typedef struct sha256_ctx my_sha256_ctx;
  177. #if !defined(CALG_SHA_256)
  178. #define CALG_SHA_256 0x0000800c
  179. #endif
  180. static CURLcode my_sha256_init(my_sha256_ctx *ctx)
  181. {
  182. if(CryptAcquireContext(&ctx->hCryptProv, NULL, NULL, PROV_RSA_AES,
  183. CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
  184. CryptCreateHash(ctx->hCryptProv, CALG_SHA_256, 0, 0, &ctx->hHash);
  185. }
  186. return CURLE_OK;
  187. }
  188. static void my_sha256_update(my_sha256_ctx *ctx,
  189. const unsigned char *data,
  190. unsigned int length)
  191. {
  192. CryptHashData(ctx->hHash, (unsigned char *) data, length, 0);
  193. }
  194. static void my_sha256_final(unsigned char *digest, my_sha256_ctx *ctx)
  195. {
  196. unsigned long length = 0;
  197. CryptGetHashParam(ctx->hHash, HP_HASHVAL, NULL, &length, 0);
  198. if(length == SHA256_DIGEST_LENGTH)
  199. CryptGetHashParam(ctx->hHash, HP_HASHVAL, digest, &length, 0);
  200. if(ctx->hHash)
  201. CryptDestroyHash(ctx->hHash);
  202. if(ctx->hCryptProv)
  203. CryptReleaseContext(ctx->hCryptProv, 0);
  204. }
  205. #else
  206. /* When no other crypto library is available we use this code segment */
  207. /* This is based on SHA256 implementation in LibTomCrypt that was released into
  208. * public domain by Tom St Denis. */
  209. #define WPA_GET_BE32(a) ((((unsigned long)(a)[0]) << 24) | \
  210. (((unsigned long)(a)[1]) << 16) | \
  211. (((unsigned long)(a)[2]) << 8) | \
  212. ((unsigned long)(a)[3]))
  213. #define WPA_PUT_BE32(a, val) \
  214. do { \
  215. (a)[0] = (unsigned char)((((unsigned long) (val)) >> 24) & 0xff); \
  216. (a)[1] = (unsigned char)((((unsigned long) (val)) >> 16) & 0xff); \
  217. (a)[2] = (unsigned char)((((unsigned long) (val)) >> 8) & 0xff); \
  218. (a)[3] = (unsigned char)(((unsigned long) (val)) & 0xff); \
  219. } while(0)
  220. #ifdef HAVE_LONGLONG
  221. #define WPA_PUT_BE64(a, val) \
  222. do { \
  223. (a)[0] = (unsigned char)(((unsigned long long)(val)) >> 56); \
  224. (a)[1] = (unsigned char)(((unsigned long long)(val)) >> 48); \
  225. (a)[2] = (unsigned char)(((unsigned long long)(val)) >> 40); \
  226. (a)[3] = (unsigned char)(((unsigned long long)(val)) >> 32); \
  227. (a)[4] = (unsigned char)(((unsigned long long)(val)) >> 24); \
  228. (a)[5] = (unsigned char)(((unsigned long long)(val)) >> 16); \
  229. (a)[6] = (unsigned char)(((unsigned long long)(val)) >> 8); \
  230. (a)[7] = (unsigned char)(((unsigned long long)(val)) & 0xff); \
  231. } while(0)
  232. #else
  233. #define WPA_PUT_BE64(a, val) \
  234. do { \
  235. (a)[0] = (unsigned char)(((unsigned __int64)(val)) >> 56); \
  236. (a)[1] = (unsigned char)(((unsigned __int64)(val)) >> 48); \
  237. (a)[2] = (unsigned char)(((unsigned __int64)(val)) >> 40); \
  238. (a)[3] = (unsigned char)(((unsigned __int64)(val)) >> 32); \
  239. (a)[4] = (unsigned char)(((unsigned __int64)(val)) >> 24); \
  240. (a)[5] = (unsigned char)(((unsigned __int64)(val)) >> 16); \
  241. (a)[6] = (unsigned char)(((unsigned __int64)(val)) >> 8); \
  242. (a)[7] = (unsigned char)(((unsigned __int64)(val)) & 0xff); \
  243. } while(0)
  244. #endif
  245. struct sha256_state {
  246. #ifdef HAVE_LONGLONG
  247. unsigned long long length;
  248. #else
  249. unsigned __int64 length;
  250. #endif
  251. unsigned long state[8], curlen;
  252. unsigned char buf[64];
  253. };
  254. typedef struct sha256_state my_sha256_ctx;
  255. /* The K array */
  256. static const unsigned long K[64] = {
  257. 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
  258. 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
  259. 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
  260. 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
  261. 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
  262. 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
  263. 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
  264. 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
  265. 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
  266. 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
  267. 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
  268. 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
  269. 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
  270. };
  271. /* Various logical functions */
  272. #define RORc(x, y) \
  273. (((((unsigned long)(x) & 0xFFFFFFFFUL) >> (unsigned long)((y) & 31)) | \
  274. ((unsigned long)(x) << (unsigned long)(32 - ((y) & 31)))) & 0xFFFFFFFFUL)
  275. #define Ch(x,y,z) (z ^ (x & (y ^ z)))
  276. #define Maj(x,y,z) (((x | y) & z) | (x & y))
  277. #define S(x, n) RORc((x), (n))
  278. #define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
  279. #define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
  280. #define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
  281. #define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
  282. #define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
  283. /* Compress 512-bits */
  284. static int sha256_compress(struct sha256_state *md,
  285. unsigned char *buf)
  286. {
  287. unsigned long S[8], W[64];
  288. int i;
  289. /* Copy state into S */
  290. for(i = 0; i < 8; i++) {
  291. S[i] = md->state[i];
  292. }
  293. /* copy the state into 512-bits into W[0..15] */
  294. for(i = 0; i < 16; i++)
  295. W[i] = WPA_GET_BE32(buf + (4 * i));
  296. /* fill W[16..63] */
  297. for(i = 16; i < 64; i++) {
  298. W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) +
  299. W[i - 16];
  300. }
  301. /* Compress */
  302. #define RND(a,b,c,d,e,f,g,h,i) \
  303. do { \
  304. unsigned long t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
  305. unsigned long t1 = Sigma0(a) + Maj(a, b, c); \
  306. d += t0; \
  307. h = t0 + t1; \
  308. } while(0)
  309. for(i = 0; i < 64; ++i) {
  310. unsigned long t;
  311. RND(S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i);
  312. t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4];
  313. S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t;
  314. }
  315. /* Feedback */
  316. for(i = 0; i < 8; i++) {
  317. md->state[i] = md->state[i] + S[i];
  318. }
  319. return 0;
  320. }
  321. /* Initialize the hash state */
  322. static CURLcode my_sha256_init(struct sha256_state *md)
  323. {
  324. md->curlen = 0;
  325. md->length = 0;
  326. md->state[0] = 0x6A09E667UL;
  327. md->state[1] = 0xBB67AE85UL;
  328. md->state[2] = 0x3C6EF372UL;
  329. md->state[3] = 0xA54FF53AUL;
  330. md->state[4] = 0x510E527FUL;
  331. md->state[5] = 0x9B05688CUL;
  332. md->state[6] = 0x1F83D9ABUL;
  333. md->state[7] = 0x5BE0CD19UL;
  334. return CURLE_OK;
  335. }
  336. /*
  337. Process a block of memory though the hash
  338. @param md The hash state
  339. @param in The data to hash
  340. @param inlen The length of the data (octets)
  341. @return 0 if successful
  342. */
  343. static int my_sha256_update(struct sha256_state *md,
  344. const unsigned char *in,
  345. unsigned long inlen)
  346. {
  347. unsigned long n;
  348. #define block_size 64
  349. if(md->curlen > sizeof(md->buf))
  350. return -1;
  351. while(inlen > 0) {
  352. if(md->curlen == 0 && inlen >= block_size) {
  353. if(sha256_compress(md, (unsigned char *)in) < 0)
  354. return -1;
  355. md->length += block_size * 8;
  356. in += block_size;
  357. inlen -= block_size;
  358. }
  359. else {
  360. n = CURLMIN(inlen, (block_size - md->curlen));
  361. memcpy(md->buf + md->curlen, in, n);
  362. md->curlen += n;
  363. in += n;
  364. inlen -= n;
  365. if(md->curlen == block_size) {
  366. if(sha256_compress(md, md->buf) < 0)
  367. return -1;
  368. md->length += 8 * block_size;
  369. md->curlen = 0;
  370. }
  371. }
  372. }
  373. return 0;
  374. }
  375. /*
  376. Terminate the hash to get the digest
  377. @param md The hash state
  378. @param out [out] The destination of the hash (32 bytes)
  379. @return 0 if successful
  380. */
  381. static int my_sha256_final(unsigned char *out,
  382. struct sha256_state *md)
  383. {
  384. int i;
  385. if(md->curlen >= sizeof(md->buf))
  386. return -1;
  387. /* Increase the length of the message */
  388. md->length += md->curlen * 8;
  389. /* Append the '1' bit */
  390. md->buf[md->curlen++] = (unsigned char)0x80;
  391. /* If the length is currently above 56 bytes we append zeros
  392. * then compress. Then we can fall back to padding zeros and length
  393. * encoding like normal.
  394. */
  395. if(md->curlen > 56) {
  396. while(md->curlen < 64) {
  397. md->buf[md->curlen++] = (unsigned char)0;
  398. }
  399. sha256_compress(md, md->buf);
  400. md->curlen = 0;
  401. }
  402. /* Pad up to 56 bytes of zeroes */
  403. while(md->curlen < 56) {
  404. md->buf[md->curlen++] = (unsigned char)0;
  405. }
  406. /* Store length */
  407. WPA_PUT_BE64(md->buf + 56, md->length);
  408. sha256_compress(md, md->buf);
  409. /* Copy output */
  410. for(i = 0; i < 8; i++)
  411. WPA_PUT_BE32(out + (4 * i), md->state[i]);
  412. return 0;
  413. }
  414. #endif /* CRYPTO LIBS */
  415. /*
  416. * Curl_sha256it()
  417. *
  418. * Generates a SHA256 hash for the given input data.
  419. *
  420. * Parameters:
  421. *
  422. * output [in/out] - The output buffer.
  423. * input [in] - The input data.
  424. * length [in] - The input length.
  425. *
  426. * Returns CURLE_OK on success.
  427. */
  428. CURLcode Curl_sha256it(unsigned char *output, const unsigned char *input,
  429. const size_t length)
  430. {
  431. CURLcode result;
  432. my_sha256_ctx ctx;
  433. result = my_sha256_init(&ctx);
  434. if(!result) {
  435. my_sha256_update(&ctx, input, curlx_uztoui(length));
  436. my_sha256_final(output, &ctx);
  437. }
  438. return result;
  439. }
  440. const struct HMAC_params Curl_HMAC_SHA256[] = {
  441. {
  442. /* Hash initialization function. */
  443. CURLX_FUNCTION_CAST(HMAC_hinit_func, my_sha256_init),
  444. /* Hash update function. */
  445. CURLX_FUNCTION_CAST(HMAC_hupdate_func, my_sha256_update),
  446. /* Hash computation end function. */
  447. CURLX_FUNCTION_CAST(HMAC_hfinal_func, my_sha256_final),
  448. /* Size of hash context structure. */
  449. sizeof(my_sha256_ctx),
  450. /* Maximum key length. */
  451. 64,
  452. /* Result size. */
  453. 32
  454. }
  455. };
  456. #endif /* CURL_DISABLE_CRYPTO_AUTH */