Mercurial > openid

annotate src/c/openid.c @ 38:8d23d76b5d48

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Stop setting an id callback
author Adam Chlipala <adam@chlipala.net>
date Mon, 16 May 2011 22:31:26 -0400
parents f129ddee75f3
children 5415f1ded564
rev   line source
adam@14 1 #include <ctype.h>
adam@1 2 #include <string.h>
adam@1 3
adam@6 4 #include <openssl/bio.h>
adam@6 5 #include <openssl/evp.h>
adam@6 6 #include <openssl/buffer.h>
adam@0 7 #include <openssl/sha.h>
adam@7 8 #include <openssl/hmac.h>
adam@8 9 #include <openssl/dh.h>
adam@0 10 #include <curl/curl.h>
adam@1 11 #include <expat.h>
adam@0 12
adam@26 13 #include <pthread.h>
adam@26 14
adam@1 15 #include <openid.h>
adam@0 16
adam@3 17 #define BUF_MAX 10240
adam@3 18 #define BUF_INIT 1024
adam@3 19
adam@26 20 #define DEFAULT_PRIME "DCF93A0B883972EC0E19989AC5A2CE310E1D37717E8D9571BB7623731866E61EF75A2E27898B057F9891C2E27A639C3F29B60814581CD3B2CA3986D2683705577D45C2E7E52DC81C7A171876E5CEA74B1448BFDFAF18828EFD2519F14E45E3826634AF1949E5B535CC829A483B8A76223E5D490A257F05BDFF16F2FB22C583AB"
adam@26 21 #define DEFAULT_GENERATOR "2"
adam@26 22
adam@26 23 static BIGNUM *default_prime, *default_generator;
adam@2 24
adam@2 25 uw_Basis_string uw_OpenidFfi_endpoint(uw_context ctx, uw_OpenidFfi_discovery d) {
adam@8 26 return d.endpoint;
adam@2 27 }
adam@2 28
adam@2 29 uw_Basis_string uw_OpenidFfi_localId(uw_context ctx, uw_OpenidFfi_discovery d) {
adam@8 30 return d.localId;
adam@2 31 }
adam@2 32
adam@26 33 static pthread_mutex_t *locks;
adam@26 34
adam@26 35 static void locking_function(int mode, int n, const char *file, int line) {
adam@26 36 if (mode & CRYPTO_LOCK)
adam@26 37 pthread_mutex_lock(&locks[n]);
adam@26 38 else
adam@26 39 pthread_mutex_unlock(&locks[n]);
adam@26 40 }
adam@26 41
adam@0 42 uw_unit uw_OpenidFfi_init(uw_context ctx) {
adam@26 43 int nl = CRYPTO_num_locks(), i;
adam@26 44 locks = malloc(sizeof(pthread_mutex_t) * nl);
adam@26 45 for (i = 0; i < nl; ++i)
adam@26 46 pthread_mutex_init(&locks[i], NULL);
adam@26 47
adam@26 48 CRYPTO_set_locking_callback(locking_function);
adam@0 49 curl_global_init(CURL_GLOBAL_ALL);
adam@0 50
adam@26 51 BN_hex2bn(&default_prime, DEFAULT_PRIME);
adam@26 52 BN_dec2bn(&default_generator, DEFAULT_GENERATOR);
adam@26 53
adam@0 54 return uw_unit_v;
adam@0 55 }
adam@1 56
adam@1 57 static CURL *curl(uw_context ctx) {
adam@1 58 CURL *r;
adam@1 59
adam@1 60 if (!(r = uw_get_global(ctx, "curl"))) {
adam@1 61 r = curl_easy_init();
adam@1 62 if (r)
adam@1 63 uw_set_global(ctx, "curl", r, curl_easy_cleanup);
adam@1 64 }
adam@1 65
adam@1 66 return r;
adam@1 67 }
adam@1 68
adam@26 69 typedef enum { NONE, SERVICE, TYPE, MATCHED, URI } xrds_mode;
adam@26 70
adam@1 71 typedef struct {
adam@1 72 uw_context ctx;
adam@8 73 uw_OpenidFfi_discovery *d;
adam@26 74 xrds_mode mode;
adam@27 75 int cur_priority, max_priority;
adam@1 76 } endpoint;
adam@1 77
adam@1 78 static void XMLCALL startElement(void *userData, const XML_Char *name, const XML_Char **atts) {
adam@1 79 endpoint *ep = userData;
adam@1 80
adam@26 81 if (!strncmp(name, "xrd:", 4))
adam@26 82 name += 4;
adam@26 83
adam@1 84 if (!strcmp(name, "link")) {
adam@1 85 const XML_Char **attp;
adam@1 86 int found = 0;
adam@1 87
adam@1 88 for (attp = atts; *attp; attp += 2) {
adam@1 89 if (!strcmp(attp[0], "rel") && !strcmp(attp[1], "openid2.provider")) {
adam@1 90 found = 1;
adam@1 91 break;
adam@1 92 }
adam@1 93 }
adam@1 94
adam@1 95 if (found) {
adam@1 96 for (attp = atts; *attp; attp += 2) {
adam@1 97 if (!strcmp(attp[0], "href")) {
adam@2 98 ep->d->endpoint = uw_strdup(ep->ctx, attp[1]);
adam@1 99 return;
adam@1 100 }
adam@1 101 }
adam@1 102 }
adam@1 103 }
adam@27 104 else if (!strcmp(name, "Service")) {
adam@27 105 const XML_Char **attp;
adam@27 106
adam@27 107 ep->cur_priority = 0;
adam@27 108 for (attp = atts; *attp; attp += 2)
adam@27 109 if (!strcmp(attp[0], "priority")) {
adam@27 110 ep->cur_priority = atoi(attp[1]);
adam@27 111 break;
adam@27 112 }
adam@27 113
adam@26 114 ep->mode = SERVICE;
adam@27 115 } else if (!strcmp(name, "Type")) {
adam@26 116 if (ep->mode == SERVICE)
adam@26 117 ep->mode = TYPE;
adam@26 118 }
adam@26 119 else if (!strcmp(name, "URI")) {
adam@26 120 if (ep->mode == MATCHED)
adam@26 121 ep->mode = URI;
adam@26 122 }
adam@26 123 }
adam@26 124
adam@26 125 static char server[] = "http://specs.openid.net/auth/2.0/server";
adam@26 126 static char signon[] = "http://specs.openid.net/auth/2.0/signon";
adam@26 127
adam@26 128 static void XMLCALL cdata(void *userData, const XML_Char *s, int len) {
adam@26 129 endpoint *ep = userData;
adam@26 130
adam@26 131 switch (ep->mode) {
adam@26 132 case TYPE:
adam@26 133 if ((len == sizeof(server)-1 && !memcmp(server, s, sizeof(server)-1))
adam@26 134 || (len == sizeof(signon)-1 && !memcmp(signon, s, sizeof(signon)-1)))
adam@26 135 ep->mode = MATCHED;
adam@26 136 break;
adam@26 137 case URI:
adam@27 138 if (ep->cur_priority < ep->max_priority) {
adam@27 139 ep->d->endpoint = uw_malloc(ep->ctx, len+1);
adam@27 140 memcpy(ep->d->endpoint, s, len);
adam@27 141 ep->d->endpoint[len] = 0;
adam@27 142 ep->max_priority = ep->cur_priority;
adam@27 143 }
adam@26 144 break;
adam@26 145 default:
adam@26 146 break;
adam@26 147 }
adam@26 148 }
adam@26 149
adam@26 150 static void XMLCALL endElement(void *userData, const XML_Char *name) {
adam@26 151 endpoint *ep = userData;
adam@26 152
adam@26 153 if (!strncmp(name, "xrd:", 4))
adam@26 154 name += 4;
adam@26 155
adam@26 156 if (!strcmp(name, "Service"))
adam@26 157 ep->mode = NONE;
adam@26 158 else if (!strcmp(name, "Type")) {
adam@26 159 if (ep->mode != MATCHED)
adam@26 160 ep->mode = SERVICE;
adam@26 161 }
adam@26 162 else if (!strcmp(name, "URI"))
adam@26 163 ep->mode = MATCHED;
adam@1 164 }
adam@1 165
adam@1 166 typedef struct {
adam@1 167 XML_Parser parser;
adam@1 168 int any_errors;
adam@3 169 } curl_discovery_data;
adam@1 170
adam@3 171 static size_t write_discovery_data(void *buffer, size_t size, size_t nmemb, void *userp) {
adam@3 172 curl_discovery_data *d = userp;
adam@1 173
adam@1 174 if (!XML_Parse(d->parser, buffer, size * nmemb, 0))
adam@1 175 d->any_errors = 1;
adam@1 176
adam@1 177 return size * nmemb;
adam@1 178 }
adam@1 179
adam@2 180 uw_OpenidFfi_discovery *uw_OpenidFfi_discover(uw_context ctx, uw_Basis_string id) {
adam@1 181 char *s;
adam@1 182 CURL *c = curl(ctx);
adam@3 183 curl_discovery_data cd = {};
adam@8 184 uw_OpenidFfi_discovery *dy = uw_malloc(ctx, sizeof(uw_OpenidFfi_discovery));
adam@27 185 endpoint ep = {ctx, dy, NONE, 0, INT_MAX};
adam@1 186 CURLcode code;
adam@27 187 struct curl_slist *headers = NULL;
adam@1 188
adam@2 189 dy->endpoint = dy->localId = NULL;
adam@2 190
adam@1 191 if (!strchr(id, ':')) {
adam@1 192 id = uw_Basis_strcat(ctx, "http://", id);
adam@1 193 if ((s = strchr(id, '#')) != NULL)
adam@1 194 *s = 0;
adam@1 195 } else if ((s = strchr(id, '#')) != NULL) {
adam@1 196 char *id2 = uw_malloc(ctx, s - id + 1);
adam@1 197 memcpy(id2, s, s - id);
adam@1 198 id2[s - id] = 0;
adam@1 199 id = id2;
adam@1 200 }
adam@1 201
adam@1 202 cd.parser = XML_ParserCreate(NULL);
adam@1 203 XML_SetUserData(cd.parser, &ep);
adam@1 204 uw_push_cleanup(ctx, (void (*)(void *))XML_ParserFree, cd.parser);
adam@26 205 XML_SetElementHandler(cd.parser, startElement, endElement);
adam@26 206 XML_SetCharacterDataHandler(cd.parser, cdata);
adam@1 207
adam@26 208 curl_easy_reset(c);
adam@1 209 curl_easy_setopt(c, CURLOPT_URL, id);
adam@3 210 curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, write_discovery_data);
adam@1 211 curl_easy_setopt(c, CURLOPT_WRITEDATA, &cd);
adam@27 212 curl_slist_append(headers, "Accept: application/xrds+xml");
adam@27 213 uw_push_cleanup(ctx, (void (*)(void *))curl_slist_free_all, headers);
adam@27 214 curl_easy_setopt(c, CURLOPT_HTTPHEADER, headers);
adam@1 215
adam@1 216 code = curl_easy_perform(c);
adam@1 217 uw_pop_cleanup(ctx);
adam@27 218 uw_pop_cleanup(ctx);
adam@1 219
adam@8 220 if (code || !dy->endpoint)
adam@1 221 return NULL;
adam@8 222 else
adam@8 223 return dy;
adam@1 224 }
adam@3 225
adam@3 226 uw_OpenidFfi_inputs uw_OpenidFfi_createInputs(uw_context ctx) {
adam@3 227 uw_buffer *r = uw_malloc(ctx, sizeof(uw_buffer));
adam@3 228 uw_buffer_init(BUF_MAX, r, BUF_INIT);
adam@3 229 return r;
adam@3 230 }
adam@3 231
adam@8 232 static void postify(uw_OpenidFfi_inputs buf, uw_Basis_string s) {
adam@14 233 char hex[4];
adam@14 234
adam@8 235 for (; *s; ++s) {
adam@14 236 if (isalnum(*s))
adam@14 237 uw_buffer_append(buf, s, 1);
adam@14 238 else {
adam@14 239 sprintf(hex, "%%%02X", (unsigned char)*s);
adam@14 240 uw_buffer_append(buf, hex, 3);
adam@14 241 }
adam@8 242 }
adam@3 243 }
adam@3 244
adam@3 245 uw_unit uw_OpenidFfi_addInput(uw_context ctx, uw_OpenidFfi_inputs buf, uw_Basis_string key, uw_Basis_string value) {
adam@3 246 if (uw_buffer_used(buf) > 0)
adam@3 247 uw_buffer_append(buf, "&", 1);
adam@3 248
adam@14 249 uw_buffer_append(buf, key, strlen(key));
adam@3 250 uw_buffer_append(buf, "=", 1);
adam@8 251 postify(buf, value);
adam@3 252
adam@3 253 return uw_unit_v;
adam@3 254 }
adam@3 255
adam@3 256 uw_Basis_string uw_OpenidFfi_getOutput(uw_context ctx, uw_OpenidFfi_outputs buf, uw_Basis_string key) {
adam@3 257 char *s = buf->start;
adam@3 258
adam@3 259 for (; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@3 260 if (!strcmp(key, s))
adam@3 261 return strchr(s, 0)+1;
adam@3 262
adam@3 263 return NULL;
adam@3 264 }
adam@3 265
adam@27 266 uw_unit uw_OpenidFfi_printOutputs(uw_context ctx, uw_OpenidFfi_outputs buf) {
adam@27 267 char *s = buf->start;
adam@27 268
adam@27 269 for (; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@27 270 fprintf(stderr, "%s => %s\n", s, strchr(s, 0)+1);
adam@27 271
adam@27 272 return uw_unit_v;
adam@27 273 }
adam@27 274
adam@3 275 static size_t write_buffer_data(void *buffer, size_t size, size_t nmemb, void *userp) {
adam@3 276 uw_buffer *buf = userp;
adam@3 277
adam@3 278 uw_buffer_append(buf, buffer, size * nmemb);
adam@3 279
adam@3 280 return size * nmemb;
adam@3 281 }
adam@3 282
adam@3 283 const char curl_failure[] = "error\0Error fetching URL";
adam@3 284
adam@4 285 uw_OpenidFfi_outputs uw_OpenidFfi_direct(uw_context ctx, uw_Basis_string url, uw_OpenidFfi_inputs inps) {
adam@3 286 uw_buffer *buf = uw_malloc(ctx, sizeof(uw_buffer));
adam@3 287 CURL *c = curl(ctx);
adam@3 288 CURLcode code;
adam@3 289
adam@3 290 uw_buffer_init(BUF_MAX, buf, BUF_INIT);
adam@3 291
adam@3 292 uw_buffer_append(inps, "", 1);
adam@3 293
adam@26 294 curl_easy_reset(c);
adam@3 295 curl_easy_setopt(c, CURLOPT_URL, url);
adam@3 296 curl_easy_setopt(c, CURLOPT_POSTFIELDS, inps->start);
adam@3 297 curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, write_buffer_data);
adam@3 298 curl_easy_setopt(c, CURLOPT_WRITEDATA, buf);
adam@3 299
adam@3 300 code = curl_easy_perform(c);
adam@3 301 uw_buffer_append(buf, "", 1);
adam@3 302
adam@3 303 if (code) {
adam@3 304 uw_buffer_reset(buf);
adam@3 305 uw_buffer_append(buf, curl_failure, sizeof curl_failure);
adam@3 306 } else {
adam@3 307 char *s;
adam@3 308
adam@3 309 s = buf->start;
adam@3 310 while (*s) {
adam@3 311 char *colon = strchr(s, ':'), *newline;
adam@3 312
adam@3 313 if (!colon) {
adam@3 314 *s = 0;
adam@3 315 break;
adam@3 316 }
adam@3 317
adam@7 318 *colon = 0;
adam@7 319
adam@3 320 newline = strchr(colon+1, '\n');
adam@3 321
adam@7 322 if (!newline)
adam@3 323 break;
adam@3 324
adam@3 325 *newline = 0;
adam@3 326 s = newline+1;
adam@3 327 }
adam@3 328 }
adam@3 329
adam@3 330 return buf;
adam@3 331 }
adam@4 332
adam@4 333 static uw_Basis_string deurl(uw_context ctx, uw_Basis_string s) {
adam@4 334 uw_Basis_string r = uw_malloc(ctx, strlen(s)), s2 = r;
adam@4 335
adam@4 336 for (; *s; ++s) {
adam@4 337 if (s[0] == '%' && s[1] && s[2]) {
adam@4 338 unsigned u;
adam@4 339
adam@4 340 sscanf(s+1, "%02x", &u);
adam@4 341 *s2++ = u;
adam@4 342 s += 2;
adam@4 343 } else
adam@4 344 *s2++ = *s;
adam@4 345 }
adam@4 346
adam@4 347 *s2 = 0;
adam@4 348 return r;
adam@4 349 }
adam@4 350
adam@4 351 uw_OpenidFfi_outputs uw_OpenidFfi_indirect(uw_context ctx, uw_Basis_string fields) {
adam@4 352 uw_OpenidFfi_outputs b = malloc(sizeof(uw_buffer));
adam@4 353
adam@4 354 uw_buffer_init(BUF_MAX, b, BUF_INIT);
adam@4 355
adam@6 356 fields = uw_strdup(ctx, fields);
adam@6 357
adam@4 358 while (*fields) {
adam@4 359 char *equal = strchr(fields, '='), *and, *s;
adam@4 360
adam@4 361 if (!equal)
adam@4 362 break;
adam@4 363
adam@4 364 *equal = 0;
adam@4 365 s = deurl(ctx, fields);
adam@4 366 uw_buffer_append(b, s, strlen(s));
adam@4 367 uw_buffer_append(b, "", 1);
adam@4 368
adam@4 369 and = strchr(equal+1, '&');
adam@4 370 if (and) {
adam@4 371 *and = 0;
adam@4 372 fields = and+1;
adam@4 373 } else
adam@4 374 fields = and = strchr(equal+1, 0);
adam@4 375 s = deurl(ctx, equal+1);
adam@4 376 uw_buffer_append(b, s, strlen(s));
adam@4 377 uw_buffer_append(b, "", 1);
adam@4 378 }
adam@4 379
adam@4 380 uw_buffer_append(b, "", 1);
adam@4 381 return b;
adam@4 382 }
adam@6 383
adam@6 384 static uw_Basis_string base64(uw_context ctx, unsigned char *input, int length) {
adam@6 385 BIO *bmem, *b64;
adam@6 386
adam@6 387 b64 = BIO_new(BIO_f_base64());
adam@7 388 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
adam@6 389 bmem = BIO_new(BIO_s_mem());
adam@7 390 BIO_push(b64, bmem);
adam@6 391 BIO_write(b64, input, length);
adam@6 392 (void)BIO_flush(b64);
adam@6 393
adam@7 394 int len = BIO_ctrl_pending(bmem);
adam@7 395 char *buff = uw_malloc(ctx, len+1);
adam@7 396 BIO_read(bmem, buff, len);
adam@7 397 buff[len] = 0;
adam@6 398
adam@6 399 BIO_free_all(b64);
adam@6 400
adam@6 401 return buff;
adam@6 402 }
adam@6 403
adam@8 404 static int unbase64(unsigned char *input, int length, unsigned char *buffer, int bufferLength)
adam@7 405 {
adam@7 406 BIO *b64, *bmem;
adam@8 407 int n;
adam@6 408
adam@7 409 b64 = BIO_new(BIO_f_base64());
adam@7 410 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
adam@7 411 bmem = BIO_new_mem_buf(input, length);
adam@7 412 BIO_push(b64, bmem);
adam@8 413 n = BIO_read(b64, buffer, bufferLength);
adam@6 414
adam@7 415 BIO_free_all(bmem);
adam@8 416
adam@8 417 return n;
adam@8 418 }
adam@8 419
adam@12 420 uw_Basis_string uw_OpenidFfi_hmac_sha1(uw_context ctx, uw_Basis_string key, uw_Basis_string data) {
adam@8 421 unsigned char keyBin[SHA_DIGEST_LENGTH], out[EVP_MAX_MD_SIZE];
adam@8 422 unsigned outLen;
adam@8 423
adam@8 424 unbase64((unsigned char *)key, strlen(key), keyBin, sizeof keyBin);
adam@8 425
adam@8 426 HMAC(EVP_sha1(), keyBin, sizeof keyBin, (unsigned char *)data, strlen(data), out, &outLen);
adam@8 427 return base64(ctx, out, outLen);
adam@6 428 }
adam@7 429
adam@12 430 uw_Basis_string uw_OpenidFfi_hmac_sha256(uw_context ctx, uw_Basis_string key, uw_Basis_string data) {
adam@7 431 unsigned char keyBin[SHA256_DIGEST_LENGTH], out[EVP_MAX_MD_SIZE];
adam@7 432 unsigned outLen;
adam@7 433
adam@7 434 unbase64((unsigned char *)key, strlen(key), keyBin, sizeof keyBin);
adam@7 435
adam@7 436 HMAC(EVP_sha256(), keyBin, sizeof keyBin, (unsigned char *)data, strlen(data), out, &outLen);
adam@7 437 return base64(ctx, out, outLen);
adam@7 438 }
adam@8 439
adam@8 440 static uw_Basis_string btwoc(uw_context ctx, const BIGNUM *n) {
adam@8 441 int len = BN_num_bytes(n), i;
adam@8 442 unsigned char bytes[len+1];
adam@8 443
adam@8 444 bytes[0] = 0;
adam@8 445 BN_bn2bin(n, bytes+1);
adam@8 446
adam@8 447 for (i = 1; i <= len; ++i)
adam@8 448 if (bytes[i]) {
adam@8 449 if (bytes[i] & 0x80)
adam@8 450 --i;
adam@8 451 break;
adam@8 452 }
adam@8 453
adam@8 454 if (i > len)
adam@8 455 i = len;
adam@8 456
adam@8 457 return base64(ctx, bytes+i, len+1-i);
adam@8 458 }
adam@8 459
adam@8 460 static BIGNUM *unbtwoc(uw_context ctx, uw_Basis_string s) {
adam@8 461 unsigned char bytes[1024];
adam@8 462 int len;
adam@8 463
adam@8 464 len = unbase64((unsigned char *)s, strlen(s), bytes, sizeof bytes);
adam@8 465 return BN_bin2bn(bytes, len, NULL);
adam@8 466 }
adam@8 467
adam@8 468 uw_Basis_string uw_OpenidFfi_modulus(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 469 return btwoc(ctx, dh->p);
adam@8 470 }
adam@8 471
adam@8 472 uw_Basis_string uw_OpenidFfi_generator(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 473 return btwoc(ctx, dh->g);
adam@8 474 }
adam@8 475
adam@8 476 uw_Basis_string uw_OpenidFfi_public(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 477 return btwoc(ctx, dh->pub_key);
adam@8 478 }
adam@8 479
adam@8 480 static void free_DH(void *data, int will_retry) {
adam@8 481 DH *dh = data;
adam@26 482 dh->p = NULL;
adam@26 483 dh->g = NULL;
adam@8 484 DH_free(dh);
adam@8 485 }
adam@8 486
adam@8 487 uw_OpenidFfi_dh uw_OpenidFfi_generate(uw_context ctx) {
adam@8 488 DH *dh = DH_new();
adam@8 489
adam@26 490 dh->p = default_prime;
adam@26 491 dh->g = default_generator;
adam@8 492 uw_register_transactional(ctx, dh, NULL, NULL, free_DH);
adam@8 493
adam@8 494 if (DH_generate_key(dh) != 1)
adam@8 495 uw_error(ctx, FATAL, "Diffie-Hellman key generation failed");
adam@8 496
adam@8 497 return dh;
adam@8 498 }
adam@8 499
adam@8 500 uw_Basis_string uw_OpenidFfi_compute(uw_context ctx, uw_OpenidFfi_dh dh, uw_Basis_string server_pub) {
adam@8 501 BIGNUM *bn = unbtwoc(ctx, server_pub);
adam@12 502 unsigned char secret[DH_size(dh)+1], *secretP;
adam@8 503 int size;
adam@8 504
adam@8 505 uw_push_cleanup(ctx, (void (*)(void *))BN_free, bn);
adam@8 506
adam@12 507 size = DH_compute_key(secret+1, bn, dh);
adam@8 508 if (size == -1)
adam@8 509 uw_error(ctx, FATAL, "Diffie-Hellman key computation failed");
adam@8 510
adam@8 511 uw_pop_cleanup(ctx);
adam@8 512
adam@12 513 if (size > 0 && (secret[1] & 0x80)) {
adam@12 514 secret[0] = 0;
adam@12 515 secretP = secret;
adam@12 516 ++size;
adam@12 517 } else
adam@12 518 secretP = secret+1;
adam@12 519
adam@12 520 return base64(ctx, secretP, size);
adam@8 521 }
adam@12 522
adam@12 523 uw_Basis_string uw_OpenidFfi_sha1(uw_context ctx, uw_Basis_string data) {
adam@12 524 unsigned char dataBin[128], out[EVP_MAX_MD_SIZE];
adam@12 525 int len;
adam@12 526
adam@12 527 len = unbase64((unsigned char *)data, strlen(data), dataBin, sizeof dataBin);
adam@12 528
adam@12 529 SHA1(dataBin, len, out);
adam@12 530 return base64(ctx, out, SHA_DIGEST_LENGTH);
adam@12 531 }
adam@12 532
adam@12 533 uw_Basis_string uw_OpenidFfi_sha256(uw_context ctx, uw_Basis_string data) {
adam@12 534 unsigned char dataBin[128], out[EVP_MAX_MD_SIZE];
adam@12 535 int len;
adam@12 536
adam@12 537 len = unbase64((unsigned char *)data, strlen(data), dataBin, sizeof dataBin);
adam@12 538
adam@12 539 SHA256(dataBin, len, out);
adam@12 540 return base64(ctx, out, SHA256_DIGEST_LENGTH);
adam@12 541 }
adam@12 542
adam@12 543 uw_Basis_string uw_OpenidFfi_xor(uw_context ctx, uw_Basis_string s1, uw_Basis_string s2) {
adam@12 544 unsigned char buf1[128], buf2[128], bufO[128];
adam@12 545 int len1, len2, i;
adam@12 546
adam@12 547 len1 = unbase64((unsigned char *)s1, strlen(s1), buf1, sizeof buf1);
adam@12 548 len2 = unbase64((unsigned char *)s2, strlen(s2), buf2, sizeof buf2);
adam@12 549
adam@12 550 for (i = 0; i < len1; ++i)
adam@12 551 bufO[i] = buf1[i] ^ buf2[i % len2];
adam@12 552
adam@12 553 return base64(ctx, bufO, len1);
adam@12 554 }
adam@13 555
adam@13 556 uw_OpenidFfi_inputs uw_OpenidFfi_remode(uw_context ctx, uw_OpenidFfi_outputs out, uw_Basis_string mode) {
adam@13 557 uw_OpenidFfi_inputs in = uw_OpenidFfi_createInputs(ctx);
adam@13 558 char *s;
adam@13 559
adam@13 560 for (s = out->start; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@13 561 if (!strcmp("openid.mode", s))
adam@13 562 uw_OpenidFfi_addInput(ctx, in, "openid.mode", mode);
adam@13 563 else
adam@13 564 uw_OpenidFfi_addInput(ctx, in, s, strchr(s, 0)+1);
adam@13 565
adam@13 566 return in;
adam@13 567 }