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annotate src/c/openid.c @ 30:5d6337df5ec7

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A silly RPC bug that I'm surprised wasn't caught before now
author Adam Chlipala <adam@chlipala.net>
date Sun, 17 Apr 2011 13:15:10 -0400
parents f129ddee75f3
children 8d23d76b5d48
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@26 42 static unsigned long id_function() {
adam@26 43 return pthread_self();
adam@26 44 }
adam@26 45
adam@0 46 uw_unit uw_OpenidFfi_init(uw_context ctx) {
adam@26 47 int nl = CRYPTO_num_locks(), i;
adam@26 48 locks = malloc(sizeof(pthread_mutex_t) * nl);
adam@26 49 for (i = 0; i < nl; ++i)
adam@26 50 pthread_mutex_init(&locks[i], NULL);
adam@26 51
adam@26 52 CRYPTO_set_locking_callback(locking_function);
adam@26 53 CRYPTO_set_id_callback(id_function);
adam@0 54 curl_global_init(CURL_GLOBAL_ALL);
adam@0 55
adam@26 56 BN_hex2bn(&default_prime, DEFAULT_PRIME);
adam@26 57 BN_dec2bn(&default_generator, DEFAULT_GENERATOR);
adam@26 58
adam@0 59 return uw_unit_v;
adam@0 60 }
adam@1 61
adam@1 62 static CURL *curl(uw_context ctx) {
adam@1 63 CURL *r;
adam@1 64
adam@1 65 if (!(r = uw_get_global(ctx, "curl"))) {
adam@1 66 r = curl_easy_init();
adam@1 67 if (r)
adam@1 68 uw_set_global(ctx, "curl", r, curl_easy_cleanup);
adam@1 69 }
adam@1 70
adam@1 71 return r;
adam@1 72 }
adam@1 73
adam@26 74 typedef enum { NONE, SERVICE, TYPE, MATCHED, URI } xrds_mode;
adam@26 75
adam@1 76 typedef struct {
adam@1 77 uw_context ctx;
adam@8 78 uw_OpenidFfi_discovery *d;
adam@26 79 xrds_mode mode;
adam@27 80 int cur_priority, max_priority;
adam@1 81 } endpoint;
adam@1 82
adam@1 83 static void XMLCALL startElement(void *userData, const XML_Char *name, const XML_Char **atts) {
adam@1 84 endpoint *ep = userData;
adam@1 85
adam@26 86 if (!strncmp(name, "xrd:", 4))
adam@26 87 name += 4;
adam@26 88
adam@1 89 if (!strcmp(name, "link")) {
adam@1 90 const XML_Char **attp;
adam@1 91 int found = 0;
adam@1 92
adam@1 93 for (attp = atts; *attp; attp += 2) {
adam@1 94 if (!strcmp(attp[0], "rel") && !strcmp(attp[1], "openid2.provider")) {
adam@1 95 found = 1;
adam@1 96 break;
adam@1 97 }
adam@1 98 }
adam@1 99
adam@1 100 if (found) {
adam@1 101 for (attp = atts; *attp; attp += 2) {
adam@1 102 if (!strcmp(attp[0], "href")) {
adam@2 103 ep->d->endpoint = uw_strdup(ep->ctx, attp[1]);
adam@1 104 return;
adam@1 105 }
adam@1 106 }
adam@1 107 }
adam@1 108 }
adam@27 109 else if (!strcmp(name, "Service")) {
adam@27 110 const XML_Char **attp;
adam@27 111
adam@27 112 ep->cur_priority = 0;
adam@27 113 for (attp = atts; *attp; attp += 2)
adam@27 114 if (!strcmp(attp[0], "priority")) {
adam@27 115 ep->cur_priority = atoi(attp[1]);
adam@27 116 break;
adam@27 117 }
adam@27 118
adam@26 119 ep->mode = SERVICE;
adam@27 120 } else if (!strcmp(name, "Type")) {
adam@26 121 if (ep->mode == SERVICE)
adam@26 122 ep->mode = TYPE;
adam@26 123 }
adam@26 124 else if (!strcmp(name, "URI")) {
adam@26 125 if (ep->mode == MATCHED)
adam@26 126 ep->mode = URI;
adam@26 127 }
adam@26 128 }
adam@26 129
adam@26 130 static char server[] = "http://specs.openid.net/auth/2.0/server";
adam@26 131 static char signon[] = "http://specs.openid.net/auth/2.0/signon";
adam@26 132
adam@26 133 static void XMLCALL cdata(void *userData, const XML_Char *s, int len) {
adam@26 134 endpoint *ep = userData;
adam@26 135
adam@26 136 switch (ep->mode) {
adam@26 137 case TYPE:
adam@26 138 if ((len == sizeof(server)-1 && !memcmp(server, s, sizeof(server)-1))
adam@26 139 || (len == sizeof(signon)-1 && !memcmp(signon, s, sizeof(signon)-1)))
adam@26 140 ep->mode = MATCHED;
adam@26 141 break;
adam@26 142 case URI:
adam@27 143 if (ep->cur_priority < ep->max_priority) {
adam@27 144 ep->d->endpoint = uw_malloc(ep->ctx, len+1);
adam@27 145 memcpy(ep->d->endpoint, s, len);
adam@27 146 ep->d->endpoint[len] = 0;
adam@27 147 ep->max_priority = ep->cur_priority;
adam@27 148 }
adam@26 149 break;
adam@26 150 default:
adam@26 151 break;
adam@26 152 }
adam@26 153 }
adam@26 154
adam@26 155 static void XMLCALL endElement(void *userData, const XML_Char *name) {
adam@26 156 endpoint *ep = userData;
adam@26 157
adam@26 158 if (!strncmp(name, "xrd:", 4))
adam@26 159 name += 4;
adam@26 160
adam@26 161 if (!strcmp(name, "Service"))
adam@26 162 ep->mode = NONE;
adam@26 163 else if (!strcmp(name, "Type")) {
adam@26 164 if (ep->mode != MATCHED)
adam@26 165 ep->mode = SERVICE;
adam@26 166 }
adam@26 167 else if (!strcmp(name, "URI"))
adam@26 168 ep->mode = MATCHED;
adam@1 169 }
adam@1 170
adam@1 171 typedef struct {
adam@1 172 XML_Parser parser;
adam@1 173 int any_errors;
adam@3 174 } curl_discovery_data;
adam@1 175
adam@3 176 static size_t write_discovery_data(void *buffer, size_t size, size_t nmemb, void *userp) {
adam@3 177 curl_discovery_data *d = userp;
adam@1 178
adam@1 179 if (!XML_Parse(d->parser, buffer, size * nmemb, 0))
adam@1 180 d->any_errors = 1;
adam@1 181
adam@1 182 return size * nmemb;
adam@1 183 }
adam@1 184
adam@2 185 uw_OpenidFfi_discovery *uw_OpenidFfi_discover(uw_context ctx, uw_Basis_string id) {
adam@1 186 char *s;
adam@1 187 CURL *c = curl(ctx);
adam@3 188 curl_discovery_data cd = {};
adam@8 189 uw_OpenidFfi_discovery *dy = uw_malloc(ctx, sizeof(uw_OpenidFfi_discovery));
adam@27 190 endpoint ep = {ctx, dy, NONE, 0, INT_MAX};
adam@1 191 CURLcode code;
adam@27 192 struct curl_slist *headers = NULL;
adam@1 193
adam@2 194 dy->endpoint = dy->localId = NULL;
adam@2 195
adam@1 196 if (!strchr(id, ':')) {
adam@1 197 id = uw_Basis_strcat(ctx, "http://", id);
adam@1 198 if ((s = strchr(id, '#')) != NULL)
adam@1 199 *s = 0;
adam@1 200 } else if ((s = strchr(id, '#')) != NULL) {
adam@1 201 char *id2 = uw_malloc(ctx, s - id + 1);
adam@1 202 memcpy(id2, s, s - id);
adam@1 203 id2[s - id] = 0;
adam@1 204 id = id2;
adam@1 205 }
adam@1 206
adam@1 207 cd.parser = XML_ParserCreate(NULL);
adam@1 208 XML_SetUserData(cd.parser, &ep);
adam@1 209 uw_push_cleanup(ctx, (void (*)(void *))XML_ParserFree, cd.parser);
adam@26 210 XML_SetElementHandler(cd.parser, startElement, endElement);
adam@26 211 XML_SetCharacterDataHandler(cd.parser, cdata);
adam@1 212
adam@26 213 curl_easy_reset(c);
adam@1 214 curl_easy_setopt(c, CURLOPT_URL, id);
adam@3 215 curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, write_discovery_data);
adam@1 216 curl_easy_setopt(c, CURLOPT_WRITEDATA, &cd);
adam@27 217 curl_slist_append(headers, "Accept: application/xrds+xml");
adam@27 218 uw_push_cleanup(ctx, (void (*)(void *))curl_slist_free_all, headers);
adam@27 219 curl_easy_setopt(c, CURLOPT_HTTPHEADER, headers);
adam@1 220
adam@1 221 code = curl_easy_perform(c);
adam@1 222 uw_pop_cleanup(ctx);
adam@27 223 uw_pop_cleanup(ctx);
adam@1 224
adam@8 225 if (code || !dy->endpoint)
adam@1 226 return NULL;
adam@8 227 else
adam@8 228 return dy;
adam@1 229 }
adam@3 230
adam@3 231 uw_OpenidFfi_inputs uw_OpenidFfi_createInputs(uw_context ctx) {
adam@3 232 uw_buffer *r = uw_malloc(ctx, sizeof(uw_buffer));
adam@3 233 uw_buffer_init(BUF_MAX, r, BUF_INIT);
adam@3 234 return r;
adam@3 235 }
adam@3 236
adam@8 237 static void postify(uw_OpenidFfi_inputs buf, uw_Basis_string s) {
adam@14 238 char hex[4];
adam@14 239
adam@8 240 for (; *s; ++s) {
adam@14 241 if (isalnum(*s))
adam@14 242 uw_buffer_append(buf, s, 1);
adam@14 243 else {
adam@14 244 sprintf(hex, "%%%02X", (unsigned char)*s);
adam@14 245 uw_buffer_append(buf, hex, 3);
adam@14 246 }
adam@8 247 }
adam@3 248 }
adam@3 249
adam@3 250 uw_unit uw_OpenidFfi_addInput(uw_context ctx, uw_OpenidFfi_inputs buf, uw_Basis_string key, uw_Basis_string value) {
adam@3 251 if (uw_buffer_used(buf) > 0)
adam@3 252 uw_buffer_append(buf, "&", 1);
adam@3 253
adam@14 254 uw_buffer_append(buf, key, strlen(key));
adam@3 255 uw_buffer_append(buf, "=", 1);
adam@8 256 postify(buf, value);
adam@3 257
adam@3 258 return uw_unit_v;
adam@3 259 }
adam@3 260
adam@3 261 uw_Basis_string uw_OpenidFfi_getOutput(uw_context ctx, uw_OpenidFfi_outputs buf, uw_Basis_string key) {
adam@3 262 char *s = buf->start;
adam@3 263
adam@3 264 for (; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@3 265 if (!strcmp(key, s))
adam@3 266 return strchr(s, 0)+1;
adam@3 267
adam@3 268 return NULL;
adam@3 269 }
adam@3 270
adam@27 271 uw_unit uw_OpenidFfi_printOutputs(uw_context ctx, uw_OpenidFfi_outputs buf) {
adam@27 272 char *s = buf->start;
adam@27 273
adam@27 274 for (; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@27 275 fprintf(stderr, "%s => %s\n", s, strchr(s, 0)+1);
adam@27 276
adam@27 277 return uw_unit_v;
adam@27 278 }
adam@27 279
adam@3 280 static size_t write_buffer_data(void *buffer, size_t size, size_t nmemb, void *userp) {
adam@3 281 uw_buffer *buf = userp;
adam@3 282
adam@3 283 uw_buffer_append(buf, buffer, size * nmemb);
adam@3 284
adam@3 285 return size * nmemb;
adam@3 286 }
adam@3 287
adam@3 288 const char curl_failure[] = "error\0Error fetching URL";
adam@3 289
adam@4 290 uw_OpenidFfi_outputs uw_OpenidFfi_direct(uw_context ctx, uw_Basis_string url, uw_OpenidFfi_inputs inps) {
adam@3 291 uw_buffer *buf = uw_malloc(ctx, sizeof(uw_buffer));
adam@3 292 CURL *c = curl(ctx);
adam@3 293 CURLcode code;
adam@3 294
adam@3 295 uw_buffer_init(BUF_MAX, buf, BUF_INIT);
adam@3 296
adam@3 297 uw_buffer_append(inps, "", 1);
adam@3 298
adam@26 299 curl_easy_reset(c);
adam@3 300 curl_easy_setopt(c, CURLOPT_URL, url);
adam@3 301 curl_easy_setopt(c, CURLOPT_POSTFIELDS, inps->start);
adam@3 302 curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, write_buffer_data);
adam@3 303 curl_easy_setopt(c, CURLOPT_WRITEDATA, buf);
adam@3 304
adam@3 305 code = curl_easy_perform(c);
adam@3 306 uw_buffer_append(buf, "", 1);
adam@3 307
adam@3 308 if (code) {
adam@3 309 uw_buffer_reset(buf);
adam@3 310 uw_buffer_append(buf, curl_failure, sizeof curl_failure);
adam@3 311 } else {
adam@3 312 char *s;
adam@3 313
adam@3 314 s = buf->start;
adam@3 315 while (*s) {
adam@3 316 char *colon = strchr(s, ':'), *newline;
adam@3 317
adam@3 318 if (!colon) {
adam@3 319 *s = 0;
adam@3 320 break;
adam@3 321 }
adam@3 322
adam@7 323 *colon = 0;
adam@7 324
adam@3 325 newline = strchr(colon+1, '\n');
adam@3 326
adam@7 327 if (!newline)
adam@3 328 break;
adam@3 329
adam@3 330 *newline = 0;
adam@3 331 s = newline+1;
adam@3 332 }
adam@3 333 }
adam@3 334
adam@3 335 return buf;
adam@3 336 }
adam@4 337
adam@4 338 static uw_Basis_string deurl(uw_context ctx, uw_Basis_string s) {
adam@4 339 uw_Basis_string r = uw_malloc(ctx, strlen(s)), s2 = r;
adam@4 340
adam@4 341 for (; *s; ++s) {
adam@4 342 if (s[0] == '%' && s[1] && s[2]) {
adam@4 343 unsigned u;
adam@4 344
adam@4 345 sscanf(s+1, "%02x", &u);
adam@4 346 *s2++ = u;
adam@4 347 s += 2;
adam@4 348 } else
adam@4 349 *s2++ = *s;
adam@4 350 }
adam@4 351
adam@4 352 *s2 = 0;
adam@4 353 return r;
adam@4 354 }
adam@4 355
adam@4 356 uw_OpenidFfi_outputs uw_OpenidFfi_indirect(uw_context ctx, uw_Basis_string fields) {
adam@4 357 uw_OpenidFfi_outputs b = malloc(sizeof(uw_buffer));
adam@4 358
adam@4 359 uw_buffer_init(BUF_MAX, b, BUF_INIT);
adam@4 360
adam@6 361 fields = uw_strdup(ctx, fields);
adam@6 362
adam@4 363 while (*fields) {
adam@4 364 char *equal = strchr(fields, '='), *and, *s;
adam@4 365
adam@4 366 if (!equal)
adam@4 367 break;
adam@4 368
adam@4 369 *equal = 0;
adam@4 370 s = deurl(ctx, fields);
adam@4 371 uw_buffer_append(b, s, strlen(s));
adam@4 372 uw_buffer_append(b, "", 1);
adam@4 373
adam@4 374 and = strchr(equal+1, '&');
adam@4 375 if (and) {
adam@4 376 *and = 0;
adam@4 377 fields = and+1;
adam@4 378 } else
adam@4 379 fields = and = strchr(equal+1, 0);
adam@4 380 s = deurl(ctx, equal+1);
adam@4 381 uw_buffer_append(b, s, strlen(s));
adam@4 382 uw_buffer_append(b, "", 1);
adam@4 383 }
adam@4 384
adam@4 385 uw_buffer_append(b, "", 1);
adam@4 386 return b;
adam@4 387 }
adam@6 388
adam@6 389 static uw_Basis_string base64(uw_context ctx, unsigned char *input, int length) {
adam@6 390 BIO *bmem, *b64;
adam@6 391
adam@6 392 b64 = BIO_new(BIO_f_base64());
adam@7 393 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
adam@6 394 bmem = BIO_new(BIO_s_mem());
adam@7 395 BIO_push(b64, bmem);
adam@6 396 BIO_write(b64, input, length);
adam@6 397 (void)BIO_flush(b64);
adam@6 398
adam@7 399 int len = BIO_ctrl_pending(bmem);
adam@7 400 char *buff = uw_malloc(ctx, len+1);
adam@7 401 BIO_read(bmem, buff, len);
adam@7 402 buff[len] = 0;
adam@6 403
adam@6 404 BIO_free_all(b64);
adam@6 405
adam@6 406 return buff;
adam@6 407 }
adam@6 408
adam@8 409 static int unbase64(unsigned char *input, int length, unsigned char *buffer, int bufferLength)
adam@7 410 {
adam@7 411 BIO *b64, *bmem;
adam@8 412 int n;
adam@6 413
adam@7 414 b64 = BIO_new(BIO_f_base64());
adam@7 415 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
adam@7 416 bmem = BIO_new_mem_buf(input, length);
adam@7 417 BIO_push(b64, bmem);
adam@8 418 n = BIO_read(b64, buffer, bufferLength);
adam@6 419
adam@7 420 BIO_free_all(bmem);
adam@8 421
adam@8 422 return n;
adam@8 423 }
adam@8 424
adam@12 425 uw_Basis_string uw_OpenidFfi_hmac_sha1(uw_context ctx, uw_Basis_string key, uw_Basis_string data) {
adam@8 426 unsigned char keyBin[SHA_DIGEST_LENGTH], out[EVP_MAX_MD_SIZE];
adam@8 427 unsigned outLen;
adam@8 428
adam@8 429 unbase64((unsigned char *)key, strlen(key), keyBin, sizeof keyBin);
adam@8 430
adam@8 431 HMAC(EVP_sha1(), keyBin, sizeof keyBin, (unsigned char *)data, strlen(data), out, &outLen);
adam@8 432 return base64(ctx, out, outLen);
adam@6 433 }
adam@7 434
adam@12 435 uw_Basis_string uw_OpenidFfi_hmac_sha256(uw_context ctx, uw_Basis_string key, uw_Basis_string data) {
adam@7 436 unsigned char keyBin[SHA256_DIGEST_LENGTH], out[EVP_MAX_MD_SIZE];
adam@7 437 unsigned outLen;
adam@7 438
adam@7 439 unbase64((unsigned char *)key, strlen(key), keyBin, sizeof keyBin);
adam@7 440
adam@7 441 HMAC(EVP_sha256(), keyBin, sizeof keyBin, (unsigned char *)data, strlen(data), out, &outLen);
adam@7 442 return base64(ctx, out, outLen);
adam@7 443 }
adam@8 444
adam@8 445 static uw_Basis_string btwoc(uw_context ctx, const BIGNUM *n) {
adam@8 446 int len = BN_num_bytes(n), i;
adam@8 447 unsigned char bytes[len+1];
adam@8 448
adam@8 449 bytes[0] = 0;
adam@8 450 BN_bn2bin(n, bytes+1);
adam@8 451
adam@8 452 for (i = 1; i <= len; ++i)
adam@8 453 if (bytes[i]) {
adam@8 454 if (bytes[i] & 0x80)
adam@8 455 --i;
adam@8 456 break;
adam@8 457 }
adam@8 458
adam@8 459 if (i > len)
adam@8 460 i = len;
adam@8 461
adam@8 462 return base64(ctx, bytes+i, len+1-i);
adam@8 463 }
adam@8 464
adam@8 465 static BIGNUM *unbtwoc(uw_context ctx, uw_Basis_string s) {
adam@8 466 unsigned char bytes[1024];
adam@8 467 int len;
adam@8 468
adam@8 469 len = unbase64((unsigned char *)s, strlen(s), bytes, sizeof bytes);
adam@8 470 return BN_bin2bn(bytes, len, NULL);
adam@8 471 }
adam@8 472
adam@8 473 uw_Basis_string uw_OpenidFfi_modulus(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 474 return btwoc(ctx, dh->p);
adam@8 475 }
adam@8 476
adam@8 477 uw_Basis_string uw_OpenidFfi_generator(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 478 return btwoc(ctx, dh->g);
adam@8 479 }
adam@8 480
adam@8 481 uw_Basis_string uw_OpenidFfi_public(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 482 return btwoc(ctx, dh->pub_key);
adam@8 483 }
adam@8 484
adam@8 485 static void free_DH(void *data, int will_retry) {
adam@8 486 DH *dh = data;
adam@26 487 dh->p = NULL;
adam@26 488 dh->g = NULL;
adam@8 489 DH_free(dh);
adam@8 490 }
adam@8 491
adam@8 492 uw_OpenidFfi_dh uw_OpenidFfi_generate(uw_context ctx) {
adam@8 493 DH *dh = DH_new();
adam@8 494
adam@26 495 dh->p = default_prime;
adam@26 496 dh->g = default_generator;
adam@8 497 uw_register_transactional(ctx, dh, NULL, NULL, free_DH);
adam@8 498
adam@8 499 if (DH_generate_key(dh) != 1)
adam@8 500 uw_error(ctx, FATAL, "Diffie-Hellman key generation failed");
adam@8 501
adam@8 502 return dh;
adam@8 503 }
adam@8 504
adam@8 505 uw_Basis_string uw_OpenidFfi_compute(uw_context ctx, uw_OpenidFfi_dh dh, uw_Basis_string server_pub) {
adam@8 506 BIGNUM *bn = unbtwoc(ctx, server_pub);
adam@12 507 unsigned char secret[DH_size(dh)+1], *secretP;
adam@8 508 int size;
adam@8 509
adam@8 510 uw_push_cleanup(ctx, (void (*)(void *))BN_free, bn);
adam@8 511
adam@12 512 size = DH_compute_key(secret+1, bn, dh);
adam@8 513 if (size == -1)
adam@8 514 uw_error(ctx, FATAL, "Diffie-Hellman key computation failed");
adam@8 515
adam@8 516 uw_pop_cleanup(ctx);
adam@8 517
adam@12 518 if (size > 0 && (secret[1] & 0x80)) {
adam@12 519 secret[0] = 0;
adam@12 520 secretP = secret;
adam@12 521 ++size;
adam@12 522 } else
adam@12 523 secretP = secret+1;
adam@12 524
adam@12 525 return base64(ctx, secretP, size);
adam@8 526 }
adam@12 527
adam@12 528 uw_Basis_string uw_OpenidFfi_sha1(uw_context ctx, uw_Basis_string data) {
adam@12 529 unsigned char dataBin[128], out[EVP_MAX_MD_SIZE];
adam@12 530 int len;
adam@12 531
adam@12 532 len = unbase64((unsigned char *)data, strlen(data), dataBin, sizeof dataBin);
adam@12 533
adam@12 534 SHA1(dataBin, len, out);
adam@12 535 return base64(ctx, out, SHA_DIGEST_LENGTH);
adam@12 536 }
adam@12 537
adam@12 538 uw_Basis_string uw_OpenidFfi_sha256(uw_context ctx, uw_Basis_string data) {
adam@12 539 unsigned char dataBin[128], out[EVP_MAX_MD_SIZE];
adam@12 540 int len;
adam@12 541
adam@12 542 len = unbase64((unsigned char *)data, strlen(data), dataBin, sizeof dataBin);
adam@12 543
adam@12 544 SHA256(dataBin, len, out);
adam@12 545 return base64(ctx, out, SHA256_DIGEST_LENGTH);
adam@12 546 }
adam@12 547
adam@12 548 uw_Basis_string uw_OpenidFfi_xor(uw_context ctx, uw_Basis_string s1, uw_Basis_string s2) {
adam@12 549 unsigned char buf1[128], buf2[128], bufO[128];
adam@12 550 int len1, len2, i;
adam@12 551
adam@12 552 len1 = unbase64((unsigned char *)s1, strlen(s1), buf1, sizeof buf1);
adam@12 553 len2 = unbase64((unsigned char *)s2, strlen(s2), buf2, sizeof buf2);
adam@12 554
adam@12 555 for (i = 0; i < len1; ++i)
adam@12 556 bufO[i] = buf1[i] ^ buf2[i % len2];
adam@12 557
adam@12 558 return base64(ctx, bufO, len1);
adam@12 559 }
adam@13 560
adam@13 561 uw_OpenidFfi_inputs uw_OpenidFfi_remode(uw_context ctx, uw_OpenidFfi_outputs out, uw_Basis_string mode) {
adam@13 562 uw_OpenidFfi_inputs in = uw_OpenidFfi_createInputs(ctx);
adam@13 563 char *s;
adam@13 564
adam@13 565 for (s = out->start; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@13 566 if (!strcmp("openid.mode", s))
adam@13 567 uw_OpenidFfi_addInput(ctx, in, "openid.mode", mode);
adam@13 568 else
adam@13 569 uw_OpenidFfi_addInput(ctx, in, s, strchr(s, 0)+1);
adam@13 570
adam@13 571 return in;
adam@13 572 }