wc_encrypt.c

00001 /* wc_encrypt.c
00002  *
00003  * Copyright (C) 2006-2017 wolfSSL Inc.
00004  *
00005  * This file is part of wolfSSL.
00006  *
00007  * wolfSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * wolfSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
00020  */
00021 
00022 
00023 #ifdef HAVE_CONFIG_H
00024     #include <config.h>
00025 #endif
00026 
00027 #include <wolfcrypt/settings.h>
00028 #include <wolfcrypt/aes.h>
00029 #include <wolfcrypt/des3.h>
00030 #include <wolfcrypt/hash.h>
00031 #include <wolfcrypt/arc4.h>
00032 #include <wolfcrypt/wc_encrypt.h>
00033 #include <wolfcrypt/error-crypt.h>
00034 #include <wolfcrypt/asn.h>
00035 #include <wolfcrypt/coding.h>
00036 #include <wolfcrypt/pwdbased.h>
00037 #include <wolfcrypt/logging.h>
00038 
00039 #ifdef NO_INLINE
00040     #include <wolfcrypt/misc.h>
00041 #else
00042     #define WOLFSSL_MISC_INCLUDED
00043     #include <wolfcrypt/src/misc.c>
00044 #endif
00045 
00046 #if !defined(NO_AES) && defined(HAVE_AES_CBC)
00047 #ifdef HAVE_AES_DECRYPT
00048 int wc_AesCbcDecryptWithKey(byte* out, const byte* in, word32 inSz,
00049                                   const byte* key, word32 keySz, const byte* iv)
00050 {
00051     int  ret = 0;
00052 #ifdef WOLFSSL_SMALL_STACK
00053     Aes* aes = NULL;
00054 #else
00055     Aes  aes[1];
00056 #endif
00057 
00058     if (out == NULL || in == NULL || key == NULL || iv == NULL) {
00059         return BAD_FUNC_ARG;
00060     }
00061 
00062 #ifdef WOLFSSL_SMALL_STACK
00063     aes = (Aes*)XMALLOC(sizeof(Aes), NULL, DYNAMIC_TYPE_TMP_BUFFER);
00064     if (aes == NULL)
00065         return MEMORY_E;
00066 #endif
00067 
00068     ret = wc_AesInit(aes, NULL, INVALID_DEVID);
00069     if (ret == 0) {
00070         ret = wc_AesSetKey(aes, key, keySz, iv, AES_DECRYPTION);
00071         if (ret == 0)
00072             ret = wc_AesCbcDecrypt(aes, out, in, inSz);
00073 
00074         wc_AesFree(aes);
00075     }
00076 
00077 #ifdef WOLFSSL_SMALL_STACK
00078     XFREE(aes, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00079 #endif
00080 
00081     return ret;
00082 }
00083 #endif /* HAVE_AES_DECRYPT */
00084 
00085 int wc_AesCbcEncryptWithKey(byte* out, const byte* in, word32 inSz,
00086                             const byte* key, word32 keySz, const byte* iv)
00087 {
00088     int  ret = 0;
00089 #ifdef WOLFSSL_SMALL_STACK
00090     Aes* aes = NULL;
00091 #else
00092     Aes  aes[1];
00093 #endif
00094 
00095 #ifdef WOLFSSL_SMALL_STACK
00096     aes = (Aes*)XMALLOC(sizeof(Aes), NULL, DYNAMIC_TYPE_TMP_BUFFER);
00097     if (aes == NULL)
00098         return MEMORY_E;
00099 #endif
00100 
00101     ret = wc_AesInit(aes, NULL, INVALID_DEVID);
00102     if (ret == 0) {
00103         ret = wc_AesSetKey(aes, key, keySz, iv, AES_ENCRYPTION);
00104         if (ret == 0)
00105             ret = wc_AesCbcEncrypt(aes, out, in, inSz);
00106 
00107         wc_AesFree(aes);
00108     }
00109 
00110 #ifdef WOLFSSL_SMALL_STACK
00111     XFREE(aes, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00112 #endif
00113 
00114     return ret;
00115 }
00116 #endif /* !NO_AES && HAVE_AES_CBC */
00117 
00118 
00119 #ifndef NO_DES3
00120 int wc_Des_CbcEncryptWithKey(byte* out, const byte* in, word32 sz,
00121                              const byte* key, const byte* iv)
00122 {
00123     int ret  = 0;
00124 #ifdef WOLFSSL_SMALL_STACK
00125     Des* des = NULL;
00126 #else
00127     Des  des[1];
00128 #endif
00129 
00130 #ifdef WOLFSSL_SMALL_STACK
00131     des = (Des*)XMALLOC(sizeof(Des), NULL, DYNAMIC_TYPE_TMP_BUFFER);
00132     if (des == NULL)
00133         return MEMORY_E;
00134 #endif
00135 
00136     ret = wc_Des_SetKey(des, key, iv, DES_ENCRYPTION);
00137     if (ret == 0)
00138         ret = wc_Des_CbcEncrypt(des, out, in, sz);
00139 
00140 #ifdef WOLFSSL_SMALL_STACK
00141     XFREE(des, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00142 #endif
00143 
00144     return ret;
00145 }
00146 
00147 int wc_Des_CbcDecryptWithKey(byte* out, const byte* in, word32 sz,
00148                              const byte* key, const byte* iv)
00149 {
00150     int ret  = 0;
00151 #ifdef WOLFSSL_SMALL_STACK
00152     Des* des = NULL;
00153 #else
00154     Des  des[1];
00155 #endif
00156 
00157 #ifdef WOLFSSL_SMALL_STACK
00158     des = (Des*)XMALLOC(sizeof(Des), NULL, DYNAMIC_TYPE_TMP_BUFFER);
00159     if (des == NULL)
00160         return MEMORY_E;
00161 #endif
00162 
00163     ret = wc_Des_SetKey(des, key, iv, DES_DECRYPTION);
00164     if (ret == 0)
00165         ret = wc_Des_CbcDecrypt(des, out, in, sz);
00166 
00167 #ifdef WOLFSSL_SMALL_STACK
00168     XFREE(des, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00169 #endif
00170 
00171     return ret;
00172 }
00173 
00174 
00175 int wc_Des3_CbcEncryptWithKey(byte* out, const byte* in, word32 sz,
00176                               const byte* key, const byte* iv)
00177 {
00178     int ret    = 0;
00179 #ifdef WOLFSSL_SMALL_STACK
00180     Des3* des3 = NULL;
00181 #else
00182     Des3  des3[1];
00183 #endif
00184 
00185 #ifdef WOLFSSL_SMALL_STACK
00186     des3 = (Des3*)XMALLOC(sizeof(Des3), NULL, DYNAMIC_TYPE_TMP_BUFFER);
00187     if (des3 == NULL)
00188         return MEMORY_E;
00189 #endif
00190 
00191     ret = wc_Des3Init(des3, NULL, INVALID_DEVID);
00192     if (ret == 0) {
00193         ret = wc_Des3_SetKey(des3, key, iv, DES_ENCRYPTION);
00194         if (ret == 0)
00195             ret = wc_Des3_CbcEncrypt(des3, out, in, sz);
00196         wc_Des3Free(des3);
00197     }
00198 
00199 #ifdef WOLFSSL_SMALL_STACK
00200     XFREE(des3, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00201 #endif
00202 
00203     return ret;
00204 }
00205 
00206 
00207 int wc_Des3_CbcDecryptWithKey(byte* out, const byte* in, word32 sz,
00208                               const byte* key, const byte* iv)
00209 {
00210     int ret    = 0;
00211 #ifdef WOLFSSL_SMALL_STACK
00212     Des3* des3 = NULL;
00213 #else
00214     Des3  des3[1];
00215 #endif
00216 
00217 #ifdef WOLFSSL_SMALL_STACK
00218     des3 = (Des3*)XMALLOC(sizeof(Des3), NULL, DYNAMIC_TYPE_TMP_BUFFER);
00219     if (des3 == NULL)
00220         return MEMORY_E;
00221 #endif
00222 
00223     ret = wc_Des3Init(des3, NULL, INVALID_DEVID);
00224     if (ret == 0) {
00225         ret = wc_Des3_SetKey(des3, key, iv, DES_DECRYPTION);
00226         if (ret == 0)
00227             ret = wc_Des3_CbcDecrypt(des3, out, in, sz);
00228         wc_Des3Free(des3);
00229     }
00230 
00231 #ifdef WOLFSSL_SMALL_STACK
00232     XFREE(des3, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00233 #endif
00234 
00235     return ret;
00236 }
00237 
00238 #endif /* !NO_DES3 */
00239 
00240 
00241 #ifdef WOLFSSL_ENCRYPTED_KEYS
00242 
00243 int wc_BufferKeyDecrypt(EncryptedInfo* info, byte* der, word32 derSz,
00244     const byte* password, int passwordSz, int hashType)
00245 {
00246     int ret = NOT_COMPILED_IN;
00247 #ifdef WOLFSSL_SMALL_STACK
00248     byte* key      = NULL;
00249 #else
00250     byte  key[WC_MAX_SYM_KEY_SIZE];
00251 #endif
00252 
00253     (void)derSz;
00254     (void)passwordSz;
00255     (void)hashType;
00256 
00257     if (der == NULL || password == NULL || info == NULL || info->keySz == 0) {
00258         return BAD_FUNC_ARG;
00259     }
00260 
00261     /* use file's salt for key derivation, hex decode first */
00262     if (Base16_Decode(info->iv, info->ivSz, info->iv, &info->ivSz) != 0) {
00263         return BUFFER_E;
00264     }
00265     if (info->ivSz < PKCS5_SALT_SZ)
00266         return BUFFER_E;
00267 
00268 #ifdef WOLFSSL_SMALL_STACK
00269     key = (byte*)XMALLOC(WC_MAX_SYM_KEY_SIZE, NULL, DYNAMIC_TYPE_SYMETRIC_KEY);
00270     if (key == NULL) {
00271         return MEMORY_E;
00272     }
00273 #endif
00274 
00275 #ifndef NO_PWDBASED
00276     if ((ret = wc_PBKDF1(key, password, passwordSz, info->iv, PKCS5_SALT_SZ, 1,
00277                                         info->keySz, hashType)) != 0) {
00278 #ifdef WOLFSSL_SMALL_STACK
00279         XFREE(key, NULL, DYNAMIC_TYPE_SYMETRIC_KEY);
00280 #endif
00281         return ret;
00282     }
00283 #endif
00284 
00285 #ifndef NO_DES3
00286     if (info->cipherType == WC_CIPHER_DES)
00287         ret = wc_Des_CbcDecryptWithKey(der, der, derSz, key, info->iv);
00288     if (info->cipherType == WC_CIPHER_DES3)
00289         ret = wc_Des3_CbcDecryptWithKey(der, der, derSz, key, info->iv);
00290 #endif /* NO_DES3 */
00291 #if !defined(NO_AES) && defined(HAVE_AES_CBC) && defined(HAVE_AES_DECRYPT)
00292     if (info->cipherType == WC_CIPHER_AES_CBC)
00293         ret = wc_AesCbcDecryptWithKey(der, der, derSz, key, info->keySz,
00294             info->iv);
00295 #endif /* !NO_AES && HAVE_AES_CBC && HAVE_AES_DECRYPT */
00296 
00297 #ifdef WOLFSSL_SMALL_STACK
00298     XFREE(key, NULL, DYNAMIC_TYPE_SYMETRIC_KEY);
00299 #endif
00300 
00301     return ret;
00302 }
00303 
00304 int wc_BufferKeyEncrypt(EncryptedInfo* info, byte* der, word32 derSz,
00305     const byte* password, int passwordSz, int hashType)
00306 {
00307     int ret = NOT_COMPILED_IN;
00308 #ifdef WOLFSSL_SMALL_STACK
00309     byte* key      = NULL;
00310 #else
00311     byte  key[WC_MAX_SYM_KEY_SIZE];
00312 #endif
00313 
00314     (void)derSz;
00315     (void)passwordSz;
00316     (void)hashType;
00317 
00318     if (der == NULL || password == NULL || info == NULL || info->keySz == 0 ||
00319             info->ivSz < PKCS5_SALT_SZ) {
00320         return BAD_FUNC_ARG;
00321     }
00322 
00323 #ifdef WOLFSSL_SMALL_STACK
00324     key = (byte*)XMALLOC(WC_MAX_SYM_KEY_SIZE, NULL, DYNAMIC_TYPE_SYMETRIC_KEY);
00325     if (key == NULL) {
00326         return MEMORY_E;
00327     }
00328 #endif /* WOLFSSL_SMALL_STACK */
00329 
00330 #ifndef NO_PWDBASED
00331     if ((ret = wc_PBKDF1(key, password, passwordSz, info->iv, PKCS5_SALT_SZ, 1,
00332                                         info->keySz, hashType)) != 0) {
00333 #ifdef WOLFSSL_SMALL_STACK
00334         XFREE(key, NULL, DYNAMIC_TYPE_SYMETRIC_KEY);
00335 #endif
00336         return ret;
00337     }
00338 #endif
00339 
00340 #ifndef NO_DES3
00341     if (info->cipherType == WC_CIPHER_DES)
00342         ret = wc_Des_CbcEncryptWithKey(der, der, derSz, key, info->iv);
00343     if (info->cipherType == WC_CIPHER_DES3)
00344         ret = wc_Des3_CbcEncryptWithKey(der, der, derSz, key, info->iv);
00345 #endif /* NO_DES3 */
00346 #ifndef NO_AES
00347     if (info->cipherType == WC_CIPHER_AES_CBC)
00348         ret = wc_AesCbcEncryptWithKey(der, der, derSz, key, info->keySz,
00349             info->iv);
00350 #endif /* NO_AES */
00351 
00352 #ifdef WOLFSSL_SMALL_STACK
00353     XFREE(key, NULL, DYNAMIC_TYPE_SYMETRIC_KEY);
00354 #endif
00355 
00356     return ret;
00357 }
00358 
00359 #endif /* WOLFSSL_ENCRYPTED_KEYS */
00360 
00361 
00362 #ifndef NO_PWDBASED
00363 
00364 /* Decrypt/Encrypt input in place from parameters based on id
00365  *
00366  * returns a negative value on fail case
00367  */
00368 int wc_CryptKey(const char* password, int passwordSz, byte* salt,
00369                       int saltSz, int iterations, int id, byte* input,
00370                       int length, int version, byte* cbcIv, int enc)
00371 {
00372     int typeH;
00373     int derivedLen;
00374     int ret = 0;
00375 #ifdef WOLFSSL_SMALL_STACK
00376     byte* key;
00377 #else
00378     byte key[MAX_KEY_SIZE];
00379 #endif
00380 
00381     (void)input;
00382     (void)length;
00383     (void)enc;
00384 
00385     WOLFSSL_ENTER("wc_CryptKey");
00386 
00387     switch (id) {
00388     #ifndef NO_DES3
00389         #ifndef NO_MD5
00390         case PBE_MD5_DES:
00391             typeH = WC_MD5;
00392             derivedLen = 16;           /* may need iv for v1.5 */
00393             break;
00394         #endif
00395         #ifndef NO_SHA
00396         case PBE_SHA1_DES:
00397             typeH = WC_SHA;
00398             derivedLen = 16;           /* may need iv for v1.5 */
00399             break;
00400 
00401         case PBE_SHA1_DES3:
00402             typeH = WC_SHA;
00403             derivedLen = 32;           /* may need iv for v1.5 */
00404             break;
00405         #endif /* !NO_SHA */
00406     #endif /* !NO_DES3 */
00407     #if !defined(NO_SHA) && !defined(NO_RC4)
00408         case PBE_SHA1_RC4_128:
00409             typeH = WC_SHA;
00410             derivedLen = 16;
00411             break;
00412     #endif
00413     #ifdef WOLFSSL_AES_256
00414         case PBE_AES256_CBC:
00415             typeH = WC_SHA256;
00416             derivedLen = 32;
00417             break;
00418     #endif
00419         default:
00420             WOLFSSL_MSG("Unknown/Unsupported encrypt/decrypt id");
00421             return ALGO_ID_E;
00422     }
00423 
00424 #ifdef WOLFSSL_SMALL_STACK
00425     key = (byte*)XMALLOC(MAX_KEY_SIZE, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00426     if (key == NULL)
00427         return MEMORY_E;
00428 #endif
00429 
00430     if (version == PKCS5v2)
00431         ret = wc_PBKDF2(key, (byte*)password, passwordSz,
00432                         salt, saltSz, iterations, derivedLen, typeH);
00433 #ifndef NO_SHA
00434     else if (version == PKCS5)
00435         ret = wc_PBKDF1(key, (byte*)password, passwordSz,
00436                         salt, saltSz, iterations, derivedLen, typeH);
00437 #endif
00438     else if (version == PKCS12v1) {
00439         int  i, idx = 0;
00440         byte unicodePasswd[MAX_UNICODE_SZ];
00441 
00442         if ( (passwordSz * 2 + 2) > (int)sizeof(unicodePasswd)) {
00443 #ifdef WOLFSSL_SMALL_STACK
00444             XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00445 #endif
00446             return UNICODE_SIZE_E;
00447         }
00448 
00449         for (i = 0; i < passwordSz; i++) {
00450             unicodePasswd[idx++] = 0x00;
00451             unicodePasswd[idx++] = (byte)password[i];
00452         }
00453         /* add trailing NULL */
00454         unicodePasswd[idx++] = 0x00;
00455         unicodePasswd[idx++] = 0x00;
00456 
00457         ret =  wc_PKCS12_PBKDF(key, unicodePasswd, idx, salt, saltSz,
00458                             iterations, derivedLen, typeH, 1);
00459         if (id != PBE_SHA1_RC4_128)
00460             ret += wc_PKCS12_PBKDF(cbcIv, unicodePasswd, idx, salt, saltSz,
00461                                 iterations, 8, typeH, 2);
00462     }
00463     else {
00464 #ifdef WOLFSSL_SMALL_STACK
00465         XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00466 #endif
00467         WOLFSSL_MSG("Unknown/Unsupported PKCS version");
00468         return ALGO_ID_E;
00469     }
00470 
00471     if (ret != 0) {
00472 #ifdef WOLFSSL_SMALL_STACK
00473         XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00474 #endif
00475         return ret;
00476     }
00477 
00478     switch (id) {
00479 #ifndef NO_DES3
00480     #if !defined(NO_SHA) || !defined(NO_MD5)
00481         case PBE_MD5_DES:
00482         case PBE_SHA1_DES:
00483         {
00484             Des    des;
00485             byte*  desIv = key + 8;
00486 
00487             if (version == PKCS5v2 || version == PKCS12v1)
00488                 desIv = cbcIv;
00489 
00490             if (enc) {
00491                 ret = wc_Des_SetKey(&des, key, desIv, DES_ENCRYPTION);
00492             }
00493             else {
00494                 ret = wc_Des_SetKey(&des, key, desIv, DES_DECRYPTION);
00495             }
00496             if (ret != 0) {
00497 #ifdef WOLFSSL_SMALL_STACK
00498                 XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00499 #endif
00500                 return ret;
00501             }
00502 
00503             if (enc) {
00504                 wc_Des_CbcEncrypt(&des, input, input, length);
00505             }
00506             else {
00507                 wc_Des_CbcDecrypt(&des, input, input, length);
00508             }
00509             break;
00510         }
00511     #endif /* !NO_SHA || !NO_MD5 */
00512 
00513     #ifndef NO_SHA
00514         case PBE_SHA1_DES3:
00515         {
00516             Des3   des;
00517             byte*  desIv = key + 24;
00518 
00519             if (version == PKCS5v2 || version == PKCS12v1)
00520                 desIv = cbcIv;
00521 
00522             ret = wc_Des3Init(&des, NULL, INVALID_DEVID);
00523             if (ret != 0) {
00524 #ifdef WOLFSSL_SMALL_STACK
00525                 XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00526 #endif
00527                 return ret;
00528             }
00529             if (enc) {
00530                 ret = wc_Des3_SetKey(&des, key, desIv, DES_ENCRYPTION);
00531             }
00532             else {
00533                 ret = wc_Des3_SetKey(&des, key, desIv, DES_DECRYPTION);
00534             }
00535             if (ret != 0) {
00536 #ifdef WOLFSSL_SMALL_STACK
00537                 XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00538 #endif
00539                 return ret;
00540             }
00541             if (enc) {
00542                 ret = wc_Des3_CbcEncrypt(&des, input, input, length);
00543             }
00544             else {
00545                 ret = wc_Des3_CbcDecrypt(&des, input, input, length);
00546             }
00547             if (ret != 0) {
00548 #ifdef WOLFSSL_SMALL_STACK
00549                 XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00550 #endif
00551                 return ret;
00552             }
00553             break;
00554         }
00555     #endif /* !NO_SHA */
00556 #endif
00557 #if !defined(NO_RC4) && !defined(NO_SHA)
00558         case PBE_SHA1_RC4_128:
00559         {
00560             Arc4    dec;
00561 
00562             wc_Arc4SetKey(&dec, key, derivedLen);
00563             wc_Arc4Process(&dec, input, input, length);
00564             break;
00565         }
00566 #endif
00567 #ifndef NO_AES
00568     #ifdef WOLFSSL_AES_256
00569         case PBE_AES256_CBC:
00570         {
00571             Aes dec;
00572             ret = wc_AesInit(&dec, NULL, INVALID_DEVID);
00573             if (ret == 0)
00574                 ret = wc_AesSetKey(&dec, key, derivedLen,
00575                                    cbcIv, AES_DECRYPTION);
00576             if (ret == 0)
00577                 ret = wc_AesCbcDecrypt(&dec, input, input, length);
00578             if (ret != 0) {
00579 #ifdef WOLFSSL_SMALL_STACK
00580                 XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00581 #endif
00582                 return ret;
00583             }
00584             ForceZero(&dec, sizeof(Aes));
00585             break;
00586         }
00587     #endif /* WOLFSSL_AES_256 */
00588 #endif
00589 
00590         default:
00591 #ifdef WOLFSSL_SMALL_STACK
00592             XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00593 #endif
00594             WOLFSSL_MSG("Unknown/Unsupported encrypt/decryption algorithm");
00595             return ALGO_ID_E;
00596     }
00597 
00598 #ifdef WOLFSSL_SMALL_STACK
00599     XFREE(key, NULL, DYNAMIC_TYPE_TMP_BUFFER);
00600 #endif
00601 
00602     return ret;
00603 }
00604 
00605 #endif /* !NO_PWDBASED */
00606