src/manager/crypto/tz-backend/internals.cpp

   1 /*
   2  *  Copyright (c) 2017-2020 Samsung Electronics Co., Ltd. All rights reserved
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License
  15  */
  16 /*
  17  * @file       internals.h
  18  * @author     Krzysztof Dynowski (k.dynowski@samsung.com)
  19  * @author     Lukasz Kostyra (l.kostyra@samsung.com)
  20  * @version    1.0
  21  */
  22
  23 #include <generic-backend/exception.h>
  24 #include <generic-backend/algo-validation.h>
  25 #include <generic-backend/crypto-params.h>
  26 #include <dpl/log/log.h>
  27 #include <utils.h>
  28 #include <openssl/evp.h>
  29 #include <openssl/dsa.h>
  30 #include <openssl/ec.h>
  31 #include <openssl/bio.h>
  32 #include <openssl/bn.h>
  33
  34 #include <tz-backend/internals.h>
  35 #include <tz-backend/tz-context.h>
  36 #include <openssl-error-handler.h>
  37 #include <km_ta_defines.h>
  38 #include <key-impl.h>
  39
  40 #include <functional>
  41
  42 #ifndef __has_cpp_attribute
  43 #define __has_cpp_attribute(_) 0
  44 #endif
  45
  46 #if __has_cpp_attribute(fallthrough)
  47 #define fallthru [[fallthrough]]
  48 #else
  49 #define fallthru ((void)0)
  50 #endif
  51
  52 namespace {
  53
  54 CKM::RawBuffer extractBignumData(const BIGNUM* bn)
  55 {
  56         size_t size = static_cast<size_t>(BN_num_bytes(bn));
  57
  58         CKM::RawBuffer result(size);
  59         int ret = BN_bn2bin(bn, result.data());
  60         if (ret != static_cast<int>(size)) {
  61                 ThrowErr(CKM::Exc::Crypto::InternalError,
  62                         "Error while converting bignums - expected "
  63                         + std::to_string(size) + " bytes of data, got " + std::to_string(ret));
  64         }
  65
  66         return result;
  67 }
  68
  69 void generateDSAParams(const int sizeBits, CKM::RawBuffer &prime,
  70                                         CKM::RawBuffer &subprime, CKM::RawBuffer &base)
  71 {
  72         auto dsa = uptr<DSA_free>(DSA_new());
  73         if (!dsa) {
  74                 ThrowErr(CKM::Exc::Crypto::InternalError,
  75                         "Failed to create DSA context for parameter gen");
  76         }
  77
  78         if (DSA_generate_parameters_ex(dsa.get(), sizeBits, NULL, 0, NULL, NULL, NULL) == 0) {
  79                 ThrowErr(CKM::Exc::Crypto::InternalError,
  80                         "Failed to generate DSA params, err = " + std::to_string(ERR_get_error()));
  81         }
  82
  83         // at this stage dsa->p, dsa->q & dsa->r should contain our params
  84         // extract them into buffers
  85         const BIGNUM *p, *q, *g;
  86         DSA_get0_pqg(dsa.get(), &p, &q, &g);
  87         prime = extractBignumData(p);
  88         subprime = extractBignumData(q);
  89         base = extractBignumData(g);
  90 }
  91
  92 tz_data_type toTzDataType(const CKM::DataType dataType) {
  93         switch (dataType) {
  94         case CKM::DataType::BINARY_DATA:       return TYPE_GENERIC_SECRET;
  95         case CKM::DataType::KEY_AES:           return TYPE_SKEY;
  96         case CKM::DataType::KEY_DSA_PRIVATE:   return TYPE_AKEY_PRIVATE_DSA;
  97         case CKM::DataType::KEY_RSA_PRIVATE:   return TYPE_AKEY_PRIVATE_RSA;
  98         case CKM::DataType::KEY_ECDSA_PRIVATE: return TYPE_AKEY_PRIVATE_EC;
  99         case CKM::DataType::KEY_DSA_PUBLIC:    return TYPE_AKEY_PUBLIC_DSA;
 100         case CKM::DataType::KEY_RSA_PUBLIC:    return TYPE_AKEY_PUBLIC_RSA;
 101         case CKM::DataType::KEY_ECDSA_PUBLIC:  return TYPE_AKEY_PUBLIC_EC;
 102         default:
 103                 ThrowErr(CKM::Exc::Crypto::DataTypeNotSupported,
 104                         "Data type could not be imported by tz-backend");
 105         }
 106 }
 107
 108 tz_ec toTzEc(CKM::ElipticCurve ec)
 109 {
 110         switch(ec) {
 111         case CKM::ElipticCurve::prime192v1: return EC_NIST_P192;
 112         case CKM::ElipticCurve::prime256v1: return EC_NIST_P256;
 113         case CKM::ElipticCurve::secp384r1: return EC_NIST_P384;
 114         default: ThrowErr(CKM::Exc::Crypto::DataTypeNotSupported, "EC not supported by tz-backend");
 115         }
 116 }
 117
 118 tz_prf toTzPrf(CKM::KdfPrf prf)
 119 {
 120         switch(prf) {
 121         case CKM::KdfPrf::HMAC_SHA256: return PRF_HMAC_SHA256;
 122         case CKM::KdfPrf::HMAC_SHA384: return PRF_HMAC_SHA384;
 123         case CKM::KdfPrf::HMAC_SHA512: return PRF_HMAC_SHA512;
 124         default: ThrowErr(CKM::Exc::Crypto::DataTypeNotSupported, "PRF not supported by tz-backend");
 125         }
 126 }
 127
 128 tz_kbkdf_mode toTzKbkdfMode(CKM::KbkdfMode mode)
 129 {
 130         switch(mode) {
 131         case CKM::KbkdfMode::COUNTER: return KBKDF_MODE_COUNTER;
 132         default:
 133                 ThrowErr(CKM::Exc::Crypto::DataTypeNotSupported, "KBKDF mode not supported by tz-backend");
 134         }
 135 }
 136
 137 tz_kbkdf_ctr_loc toTzCtrLoc(CKM::KbkdfCounterLocation loc)
 138 {
 139         switch(loc) {
 140         case CKM::KbkdfCounterLocation::BEFORE_FIXED: return KBKDF_LOC_BEFORE_FIXED;
 141         case CKM::KbkdfCounterLocation::AFTER_FIXED: return KBKDF_LOC_AFTER_FIXED;
 142         case CKM::KbkdfCounterLocation::MIDDLE_FIXED: return KBKDF_LOC_MIDDLE_FIXED;
 143         default:
 144                 ThrowErr(CKM::Exc::Crypto::DataTypeNotSupported,
 145                         "KBKDF counter location not supported by tz-backend");
 146         }
 147 }
 148
 149 } // namespace
 150
 151 namespace CKM {
 152 namespace Crypto {
 153 namespace TZ {
 154 namespace Internals {
 155
 156 namespace {
 157
 158 tz_algo_type getGenSKeyType(AlgoType type)
 159 {
 160         switch (type)
 161         {
 162         case AlgoType::AES_GEN: return ALGO_AES_GEN;
 163         default: ThrowErr(Exc::Crypto::OperationNotSupported, "Requested algorithm is not supported");
 164         }
 165 }
 166
 167 tz_algo_type getAlgType(AlgoType type)
 168 {
 169         switch (type)
 170         {
 171         case AlgoType::AES_CBC: return ALGO_AES_CBC;
 172         case AlgoType::AES_CTR: return ALGO_AES_CTR;
 173         case AlgoType::AES_CFB: return ALGO_AES_CFB;
 174         case AlgoType::AES_GCM: return ALGO_AES_GCM;
 175         case AlgoType::RSA_OAEP: return ALGO_RSA;
 176         case AlgoType::RSA_SV: return ALGO_RSA_SV;
 177         case AlgoType::DSA_SV: return ALGO_DSA_SV;
 178         case AlgoType::ECDSA_SV: return ALGO_ECDSA_SV;
 179         default: ThrowErr(Exc::Crypto::OperationNotSupported, "Requested algorithm is not supported");
 180         };
 181 }
 182
 183 tz_hash_type getHashType(HashAlgorithm hash)
 184 {
 185         switch (hash)
 186         {
 187         case HashAlgorithm::SHA1: return HASH_SHA1;
 188         case HashAlgorithm::SHA256: return HASH_SHA256;
 189         case HashAlgorithm::SHA384: return HASH_SHA384;
 190         case HashAlgorithm::SHA512: return HASH_SHA512;
 191         default:
 192                 ThrowErr(Exc::Crypto::OperationNotSupported, "Requested algorithm is not supported");
 193         }
 194 }
 195
 196 void decompose(const CryptoAlgorithm &alg,
 197                            AlgoType &algo,
 198                            uint32_t &ctrLenOrTagSizeBits,
 199                            RawBuffer &iv,
 200                            RawBuffer &aad)
 201 {
 202         algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 203         switch (algo) {
 204                 case AlgoType::AES_CTR:
 205                         iv = unpack<RawBuffer>(alg, ParamName::ED_IV);
 206                         ctrLenOrTagSizeBits = unpack<uint64_t>(alg, ParamName::ED_CTR_LEN);
 207                         // counter length is in bits
 208                         if (ctrLenOrTagSizeBits != Params::DEFAULT_AES_IV_LEN * 8) {
 209                                 LogError("CTR length invalid: " << std::to_string(ctrLenOrTagSizeBits));
 210                                 ThrowErr(Exc::Crypto::InputParam, "Invalid CTR length");
 211                         }
 212                         break;
 213                 case AlgoType::AES_CBC:
 214                         iv = unpack<RawBuffer>(alg, ParamName::ED_IV);
 215                         break;
 216                 case AlgoType::AES_CFB:
 217                         iv = unpack<RawBuffer>(alg, ParamName::ED_IV);
 218                         break;
 219                 case AlgoType::AES_GCM:
 220                         iv = unpack<RawBuffer>(alg, ParamName::ED_IV);
 221                         alg.getParam(ParamName::ED_TAG_LEN, ctrLenOrTagSizeBits);
 222                         alg.getParam(ParamName::ED_AAD, aad);
 223                         break;
 224                 case AlgoType::RSA_OAEP:
 225                         break;
 226                 default:
 227                         ThrowErr(Exc::Crypto::InputParam, "Invalid decryption algorithm");
 228                         break;
 229         }
 230 }
 231
 232 } // namespace
 233
 234 RawBuffer generateIV()
 235 {
 236         RawBuffer result;
 237         TrustZoneContext::Instance().generateIV(result);
 238         return result;
 239 }
 240
 241 void generateSKey(const CryptoAlgorithm &alg,
 242                                 const Password &pwd,
 243                                 const RawBuffer &iv,
 244                                 RawBuffer &tag,
 245                                 const RawBuffer &hash)
 246 {
 247         AlgoType keyType = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 248         int keyBits = unpack<int>(alg, ParamName::GEN_KEY_LEN);
 249
 250         if (!pwd.empty()) {
 251                 if (iv.empty()) {
 252                         ThrowErr(Exc::InputParam, "Key generation with password encryption requires an IV");
 253                 }
 254
 255                 RawBuffer pwdBuf(pwd.begin(), pwd.end());
 256                 TrustZoneContext::Instance().generateSKeyPwd(getGenSKeyType(keyType),
 257                                                                                                         pwdBuf, iv, keyBits,
 258                                                                                                         tag, hash);
 259         } else {
 260                 TrustZoneContext::Instance().generateSKey(getGenSKeyType(keyType), keyBits,
 261                                                                                                 hash);
 262         }
 263
 264 }
 265
 266 AlgoType generateAKey(const CryptoAlgorithm &alg,
 267                                         const Password &pubPwd,
 268                                         const Password &privPwd,
 269                                         const RawBuffer &pubPwdIv,
 270                                         const RawBuffer &privPwdIv,
 271                                         RawBuffer &pubTag,
 272                                         RawBuffer &privTag,
 273                                         const RawBuffer &hashPriv,
 274                                         const RawBuffer &hashPub)
 275 {
 276         AlgoType keyType = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 277
 278         RawBuffer pubPwdBuf;
 279         if (!pubPwd.empty())
 280                 pubPwdBuf.assign(pubPwd.begin(), pubPwd.end());
 281
 282         RawBuffer privPwdBuf;
 283         if (!privPwd.empty())
 284                 privPwdBuf.assign(privPwd.begin(), privPwd.end());
 285
 286         switch (keyType) {
 287         case AlgoType::RSA_GEN: {
 288                 int keyBits = unpack<int>(alg, ParamName::GEN_KEY_LEN);
 289                 TrustZoneContext::Instance().generateRSAKey(keyBits,
 290                                                                                                         pubPwdBuf,
 291                                                                                                         pubPwdIv,
 292                                                                                                         privPwdBuf,
 293                                                                                                         privPwdIv,
 294                                                                                                         pubTag,
 295                                                                                                         privTag,
 296                                                                                                         hashPriv,
 297                                                                                                         hashPub);
 298                 break;
 299         }
 300         case AlgoType::DSA_GEN: {
 301                 int keyBits = unpack<int>(alg, ParamName::GEN_KEY_LEN);
 302                 RawBuffer prime;
 303                 RawBuffer subprime;
 304                 RawBuffer base;
 305                 generateDSAParams(keyBits, prime, subprime, base);
 306                 TrustZoneContext::Instance().generateDSAKey(keyBits,
 307                                                                                                         prime,
 308                                                                                                         subprime,
 309                                                                                                         base,
 310                                                                                                         pubPwdBuf,
 311                                                                                                         pubPwdIv,
 312                                                                                                         privPwdBuf,
 313                                                                                                         privPwdIv,
 314                                                                                                         pubTag,
 315                                                                                                         privTag,
 316                                                                                                         hashPriv,
 317                                                                                                         hashPub);
 318                 break;
 319         }
 320         case AlgoType::ECDSA_GEN: {
 321                 CKM::ElipticCurve ec = unpack<CKM::ElipticCurve>(alg, ParamName::GEN_EC);
 322                 TrustZoneContext::Instance().generateECKey(toTzEc(ec),
 323                                                                                                    pubPwdBuf,
 324                                                                                                    pubPwdIv,
 325                                                                                                    privPwdBuf,
 326                                                                                                    privPwdIv,
 327                                                                                                    pubTag,
 328                                                                                                    privTag,
 329                                                                                                    hashPriv,
 330                                                                                                    hashPub);
 331                 break;
 332         }
 333         default: {
 334                 ThrowErr(Exc::Crypto::InputParam,
 335                         "Invalid algo type provided for generateAKey function");
 336         }
 337         }
 338
 339         return keyType;
 340 }
 341
 342 void destroyKey(const RawBuffer &keyId)
 343 {
 344         TrustZoneContext::Instance().executeDestroy(keyId);
 345 }
 346
 347 void importData(const Data &data,
 348                                          const EncryptionParams &encData,
 349                                          const Password &pwd,
 350                                          const RawBuffer &pwdIV,
 351                                          RawBuffer &tag,
 352                                          const RawBuffer &hash)
 353 {
 354
 355         const auto dataType = toTzDataType(data.type);
 356
 357         RawBuffer pwdBuf(pwd.begin(), pwd.end());
 358         uint32_t keySizeBits = data.data.size() * 8;
 359         TrustZoneContext::Instance().importData(dataType,
 360                                                                                 data.data,
 361                                                                                 encData,
 362                                                                                 pwdBuf,
 363                                                                                 pwdIV,
 364                                                                                 keySizeBits,
 365                                                                                 tag,
 366                                                                                 hash);
 367 }
 368
 369 void importWrappedKey(const RawBuffer &wrappingKeyId,
 370                                           const Pwd &wrappingKeyPwd,
 371                                           const CryptoAlgorithm &alg,
 372                                           const Data &encryptedKey,
 373                                           const Password &encryptedKeyPassword,
 374                                           const RawBuffer &encryptedKeyIV,
 375                                           RawBuffer &encryptedKeyTag,
 376                                           const RawBuffer &encryptedKeyId)
 377 {
 378         RawBuffer encryptedKeyPwdBuf(encryptedKeyPassword.begin(), encryptedKeyPassword.end());
 379
 380         AlgoType algo;
 381         uint32_t ctrLenOrTagSizeBits = 0;
 382         RawBuffer iv;
 383         RawBuffer aad;
 384         decompose(alg, algo, ctrLenOrTagSizeBits, iv, aad);
 385
 386         // TODO it is awful!
 387         TrustZoneContext::Instance().importWrappedKey(wrappingKeyId,
 388                                                                                                   wrappingKeyPwd,
 389                                                                                                   getAlgType(algo),
 390                                                                                                   iv,
 391                                                                                                   ctrLenOrTagSizeBits,
 392                                                                                                   aad,
 393                                                                                                   toTzDataType(encryptedKey.type),
 394                                                                                                   encryptedKey.data,
 395                                                                                                   encryptedKeyPwdBuf,
 396                                                                                                   encryptedKeyIV,
 397                                                                                                   encryptedKeyTag,
 398                                                                                                   encryptedKeyId);
 399 }
 400
 401 RawBuffer exportWrappedKey(const RawBuffer &wrappingKeyId,
 402                                                    const Pwd &wrappingKeyPwd,
 403                                                    const CryptoAlgorithm &alg,
 404                                                    const RawBuffer &keyToWrapId,
 405                                                    const Pwd &keyToWrapPwd,
 406                                                    const DataType &keyToWrapType)
 407 {
 408         AlgoType algo;
 409         uint32_t ctrLenOrTagSizeBits = 0;
 410         RawBuffer iv;
 411         RawBuffer aad;
 412         decompose(alg, algo, ctrLenOrTagSizeBits, iv, aad);
 413
 414         // TODO it is awful!
 415         return TrustZoneContext::Instance().exportWrappedKey(wrappingKeyId,
 416                                                                                                                  wrappingKeyPwd,
 417                                                                                                                  getAlgType(algo),
 418                                                                                                                  iv,
 419                                                                                                                  ctrLenOrTagSizeBits,
 420                                                                                                                  aad,
 421                                                                                                                  keyToWrapId,
 422                                                                                                                  keyToWrapPwd,
 423                                                                                                                  toTzDataType(keyToWrapType));
 424 }
 425
 426 RawBuffer getData(const RawBuffer &dataId,
 427                                   const Pwd &pwd,
 428                                   const DataType &type)
 429 {
 430         RawBuffer result;
 431         TrustZoneContext::Instance().getData(dataId,
 432                                  pwd,
 433                                  toTzDataType(type),
 434                                  result);
 435         return result;
 436 }
 437
 438 void destroyData(const RawBuffer &dataId)
 439 {
 440         TrustZoneContext::Instance().destroyData(dataId);
 441 }
 442
 443 BufferPair encryptDataAesGcm(const RawBuffer &keyId,
 444                                                         const Pwd &pwd,
 445                                                         const RawBuffer &iv,
 446                                                         int tagSize,
 447                                                         const RawBuffer &data,
 448                                                         const RawBuffer &aad)
 449 {
 450         RawBuffer result;
 451         RawBuffer tag;
 452
 453         TrustZoneContext::Instance().executeEncryptAE(keyId, pwd, iv, tagSize,
 454                                                                                                 aad, data, result, tag);
 455
 456         return std::make_pair(result, tag);
 457 }
 458
 459 RawBuffer encryptDataAesGcmPacked(const RawBuffer &keyId,
 460                                                                 const Pwd &pwd,
 461                                                                 const RawBuffer &iv,
 462                                                                 int tagSize,
 463                                                                 const RawBuffer &data,
 464                                                                 const RawBuffer &aad)
 465 {
 466         auto pair = encryptDataAesGcm(keyId, pwd, iv, tagSize, data, aad);
 467         std::copy(pair.second.begin(), pair.second.end(),
 468                         std::back_inserter(pair.first));
 469         return pair.first;
 470 }
 471
 472 RawBuffer decryptDataAesGcm(const RawBuffer &keyId,
 473                                                         const Pwd &pwd,
 474                                                         const RawBuffer &iv,
 475                                                         int tagSizeBits,
 476                                                         const RawBuffer &tag,
 477                                                         const RawBuffer &data,
 478                                                         const RawBuffer &aad)
 479 {
 480         RawBuffer result;
 481
 482         TrustZoneContext::Instance().executeDecryptAE(keyId, pwd, iv, tagSizeBits,
 483                                                                                                 tag, aad, data, result);
 484
 485         return result;
 486 }
 487
 488 RawBuffer decryptDataAesGcmPacked(const RawBuffer &keyId,
 489                                                                 const Pwd &pwd,
 490                                                                 const RawBuffer &iv,
 491                                                                 int tagSizeBits,
 492                                                                 const RawBuffer &data,
 493                                                                 const RawBuffer &aad)
 494 {
 495         int tagSizeBytes = tagSizeBits / 8;
 496         if (tagSizeBytes > static_cast<int>(data.size()))
 497                 ThrowErr(Exc::Crypto::InputParam, "Wrong size of tag");
 498
 499         auto tagPos = data.data() + data.size() - tagSizeBytes;
 500         return decryptDataAesGcm(keyId,
 501                                                         pwd,
 502                                                         iv,
 503                                                         tagSizeBits,
 504                                                         RawBuffer(tagPos, data.data() + data.size()),
 505                                                         RawBuffer(data.data(), tagPos),
 506                                                         aad);
 507 }
 508
 509
 510 RawBuffer symmetricEncrypt(const RawBuffer &keyId,
 511                                                 const Pwd &pwd,
 512                                                 const CryptoAlgorithm &alg,
 513                                                 const RawBuffer &data)
 514 {
 515         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 516         uint64_t ctrLen = 0;
 517
 518         switch (algo) {
 519                 case AlgoType::AES_CTR: {
 520                         ctrLen = unpack<uint64_t>(alg, ParamName::ED_CTR_LEN);
 521                         // counter length is in bits
 522                         if (ctrLen != Params::DEFAULT_AES_IV_LEN * 8) {
 523                                 LogError("CTR length invalid: " << std::to_string(ctrLen));
 524                                 ThrowErr(Exc::Crypto::InputParam, "Invalid CTR length");
 525                         }
 526                         // no break here, we still need to slide down to executeCrypt
 527                         fallthru;
 528                 }
 529                 case AlgoType::AES_CBC:
 530                 case AlgoType::AES_CFB: {
 531                         RawBuffer result;
 532                         TrustZoneContext::Instance().executeCrypt(CMD_ENCRYPT,
 533                                                                                                         getAlgType(algo),
 534                                                                                                         keyId,
 535                                                                                                         pwd,
 536                                                                                                         unpack<RawBuffer>(alg, ParamName::ED_IV),
 537                                                                                                         data,
 538                                                                                                         result);
 539                         return result;
 540                 }
 541                 case AlgoType::AES_GCM: {
 542                         int tagLenBits = Params::DEFAULT_AES_GCM_TAG_LEN_BITS;
 543                         alg.getParam(ParamName::ED_TAG_LEN, tagLenBits);
 544                         RawBuffer aad;
 545                         alg.getParam(ParamName::ED_AAD, aad);
 546                         return encryptDataAesGcmPacked(keyId,
 547                                                                                 pwd,
 548                                                                                 unpack<RawBuffer>(alg, ParamName::ED_IV),
 549                                                                                 tagLenBits,
 550                                                                                 data,
 551                                                                                 aad);
 552                 }
 553                 default:
 554                         break;
 555         }
 556
 557         ThrowErr(Exc::Crypto::OperationNotSupported,
 558                                 "Incorrect algorithm provided for symmetric crypto operation");
 559 }
 560
 561 RawBuffer symmetricDecrypt(const RawBuffer &keyId,
 562                                                 const Pwd &pwd,
 563                                                 const CryptoAlgorithm &alg,
 564                                                 const RawBuffer &data)
 565 {
 566         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 567         uint64_t ctrLen = 0;
 568
 569         switch (algo) {
 570                 case AlgoType::AES_CTR: {
 571                         ctrLen = unpack<uint64_t>(alg, ParamName::ED_CTR_LEN);
 572                         // counter length is in bits
 573                         if (ctrLen != Params::DEFAULT_AES_IV_LEN * 8) {
 574                                 LogError("CTR length invalid: " << std::to_string(ctrLen));
 575                                 ThrowErr(Exc::Crypto::InputParam, "Invalid CTR length");
 576                         }
 577                         // no break here, we still need to slide down to executeCrypt
 578                         fallthru;
 579                 }
 580                 case AlgoType::AES_CBC:
 581                 case AlgoType::AES_CFB: {
 582                         RawBuffer result;
 583                         TrustZoneContext::Instance().executeCrypt(CMD_DECRYPT,
 584                                                                                                         getAlgType(algo),
 585                                                                                                         keyId,
 586                                                                                                         pwd,
 587                                                                                                         unpack<RawBuffer>(alg, ParamName::ED_IV),
 588                                                                                                         data,
 589                                                                                                         result);
 590                         return result;
 591                 }
 592                 case AlgoType::AES_GCM: {
 593                         int tagSizeBits = Params::DEFAULT_AES_GCM_TAG_LEN_BITS;
 594                         alg.getParam(ParamName::ED_TAG_LEN, tagSizeBits);
 595                         RawBuffer aad;
 596                         alg.getParam(ParamName::ED_AAD, aad);
 597                         return decryptDataAesGcmPacked(keyId,
 598                                                                                 pwd,
 599                                                                                 unpack<RawBuffer>(alg, ParamName::ED_IV),
 600                                                                                 tagSizeBits,
 601                                                                                 data,
 602                                                                                 aad);
 603                 }
 604                 default:
 605                         break;
 606         }
 607
 608         ThrowErr(Exc::Crypto::OperationNotSupported,
 609                                 "Incorrect algorithm provided for symmetric crypto operation");
 610 }
 611
 612 RawBuffer asymmetricEncrypt(const RawBuffer &keyId,
 613                                                         const Pwd &pwd,
 614                                                         const CryptoAlgorithm &alg,
 615                                                         const RawBuffer &data)
 616 {
 617         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 618         RawBuffer result;
 619
 620         switch (algo)
 621         {
 622         case AlgoType::RSA_OAEP: {
 623                 TrustZoneContext::Instance().executeCrypt(CMD_ENCRYPT,
 624                                                                                                 getAlgType(algo),
 625                                                                                                 keyId,
 626                                                                                                 pwd,
 627                                                                                                 result, // unused dummy
 628                                                                                                 data,
 629                                                                                                 result);
 630                 return result;
 631         }
 632         default:
 633                 break;
 634         }
 635
 636         ThrowErr(Exc::Crypto::OperationNotSupported,
 637                                 "Incorrect algorithm provided for asymmetric crypto operation");
 638 }
 639
 640 RawBuffer asymmetricDecrypt(const RawBuffer &keyId,
 641                                                         const Pwd &pwd,
 642                                                         const CryptoAlgorithm &alg,
 643                                                         const RawBuffer &cipher)
 644 {
 645         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 646         RawBuffer result;
 647
 648         switch (algo)
 649         {
 650         case AlgoType::RSA_OAEP: {
 651                 TrustZoneContext::Instance().executeCrypt(CMD_DECRYPT,
 652                                                                                                 getAlgType(algo),
 653                                                                                                 keyId,
 654                                                                                                 pwd,
 655                                                                                                 result, // unused dummy
 656                                                                                                 cipher,
 657                                                                                                 result);
 658                 return result;
 659         }
 660         default:
 661                 break;
 662         }
 663
 664         ThrowErr(Exc::Crypto::OperationNotSupported,
 665                                 "Incorrect algorithm provided for asymmetric crypto operation");
 666 }
 667
 668 uint32_t initCipher(const RawBuffer &keyId,
 669                                         const Pwd &pwd,
 670                                         const CryptoAlgorithm &alg,
 671                                         bool encrypt)
 672 {
 673         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 674
 675         switch (algo)
 676         {
 677         case AlgoType::AES_GCM: {
 678                 int tagSizeBits = Params::DEFAULT_AES_GCM_TAG_LEN_BITS;
 679                 alg.getParam(ParamName::ED_TAG_LEN, tagSizeBits);
 680                 RawBuffer aad;
 681                 alg.getParam(ParamName::ED_AAD, aad);
 682                 return TrustZoneContext::Instance().initGcmCipher(encrypt ? CIPHER_ENCRYPT : CIPHER_DECRYPT,
 683                                                                                                                   keyId,
 684                                                                                                                   pwd,
 685                                                                                                                   unpack<RawBuffer>(alg, ParamName::ED_IV),
 686                                                                                                                   tagSizeBits,
 687                                                                                                                   aad);
 688         }
 689         case AlgoType::AES_CBC:
 690         case AlgoType::AES_CTR:
 691         case AlgoType::AES_CFB:
 692                 // TODO optionally implement above modes as well
 693         default:
 694                 break;
 695         };
 696
 697         ThrowErr(Exc::Crypto::OperationNotSupported,
 698                          "Incorrect algorithm provided for symmetric crypto operation");
 699 }
 700
 701 void addAAD(uint32_t opId,
 702                         const RawBuffer &aad)
 703 {
 704         TrustZoneContext::Instance().addGcmAAD(opId, aad);
 705 }
 706
 707 RawBuffer updateCipher(uint32_t opId,
 708                                            const RawBuffer &data)
 709 {
 710         return TrustZoneContext::Instance().updateGcmCipher(opId, data);
 711 }
 712
 713 RawBuffer finalizeCipher(uint32_t opId,
 714                                                  const RawBuffer &data)
 715 {
 716         return TrustZoneContext::Instance().finalizeGcmCipher(opId, data);
 717 }
 718
 719 RawBuffer sign(const RawBuffer &pkeyId,
 720                         const Pwd &pwd,
 721                         const CryptoAlgorithm &alg,
 722                         const RawBuffer &message)
 723 {
 724         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 725         HashAlgorithm hash = unpack<HashAlgorithm>(alg, ParamName::SV_HASH_ALGO);
 726         if (algo != AlgoType::RSA_SV && hash == HashAlgorithm::NONE)
 727                 ThrowErr(Exc::Crypto::InputParam, "Only RSA supports no hash option");
 728
 729         RawBuffer signature;
 730         TrustZoneContext::Instance().executeSign(getAlgType(algo),
 731                                                                                         getHashType(hash),
 732                                                                                         pkeyId,
 733                                                                                         pwd,
 734                                                                                         message,
 735                                                                                         signature);
 736         return signature;
 737 }
 738
 739 int verify(const RawBuffer &pkeyId,
 740                 const Pwd &pwd,
 741                 const CryptoAlgorithm &alg,
 742                 const RawBuffer &message,
 743                 const RawBuffer &signature)
 744 {
 745         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 746         HashAlgorithm hash = unpack<HashAlgorithm>(alg, ParamName::SV_HASH_ALGO);
 747         if (algo != AlgoType::RSA_SV && hash == HashAlgorithm::NONE)
 748                 ThrowErr(Exc::Crypto::InputParam, "Only RSA supports no hash option");
 749
 750         return TrustZoneContext::Instance().executeVerify(getAlgType(algo),
 751                                                                                                         getHashType(hash),
 752                                                                                                         pkeyId,
 753                                                                                                         pwd,
 754                                                                                                         message,
 755                                                                                                         signature);
 756 }
 757
 758 void deriveECDH(const RawBuffer &prvKeyId,
 759                                 const Pwd &prvKeyPwd,
 760                                 const RawBuffer &pubKey,
 761                                 const Password &secretPwd,
 762                                 const RawBuffer &secretPwdIV,
 763                                 RawBuffer &secretTag,
 764                                 const RawBuffer &secretHash)
 765 {
 766         auto peerKey = std::make_shared<KeyImpl>(pubKey);
 767         if (peerKey->getType() != KeyType::KEY_ECDSA_PUBLIC)
 768                 ThrowErr(Exc::Crypto::InputParam, "ECDH requires peer's public EC key");
 769         auto peerEvp = peerKey->getEvpShPtr().get();
 770         assert(peerEvp);
 771
 772         int subType = EVP_PKEY_type(EVP_PKEY_id(peerEvp));
 773         if (subType != EVP_PKEY_EC)
 774                 ThrowErr(Exc::Crypto::InputParam, "Invalid key type: ", subType);
 775
 776         auto ecKey = EVP_PKEY_get0_EC_KEY(peerEvp);
 777         if (!ecKey)
 778                 ThrowErr(Exc::Crypto::InternalError, "Can't get EC key");
 779
 780         auto ecPoint = EC_KEY_get0_public_key(ecKey);
 781         if (!ecPoint)
 782                 ThrowErr(Exc::Crypto::InternalError, "Can't get EC public key");
 783
 784         auto ecGroup = EC_KEY_get0_group(ecKey);
 785         if (!ecGroup)
 786                 ThrowErr(Exc::Crypto::InternalError, "Can't get EC group");
 787
 788         BIGNUM *x = BN_new();
 789         BIGNUM *y = BN_new();
 790         if (!EC_POINT_get_affine_coordinates(ecGroup, ecPoint, x, y, NULL))
 791                 ThrowErr(Exc::Crypto::InternalError, "Failed to get EC pub key coordinates");
 792
 793         auto xBuf = extractBignumData(x);
 794         auto yBuf = extractBignumData(y);
 795
 796         RawBuffer secretPwdBuf(secretPwd.begin(), secretPwd.end());
 797
 798         TrustZoneContext::Instance().executeEcdh(prvKeyId,
 799                                                                                          prvKeyPwd,
 800                                                                                          xBuf,
 801                                                                                          yBuf,
 802                                                                                          secretPwdBuf,
 803                                                                                          secretPwdIV,
 804                                                                                          secretTag,
 805                                                                                          secretHash);
 806 }
 807
 808 void deriveKBKDF(const RawBuffer &secretId,
 809                                  const Pwd &secretPwd,
 810                                  const CryptoAlgorithm &alg,
 811                                  const Password &keyPwd,
 812                                  const RawBuffer &keyPwdIV,
 813                                  RawBuffer &keyTag,
 814                                  const RawBuffer &keyHash)
 815 {
 816         RawBuffer label, context, fixed;
 817         size_t length;
 818         alg.getParam(ParamName::KDF_LEN, length);
 819         alg.getParam(ParamName::KBKDF_LABEL, label);
 820         alg.getParam(ParamName::KBKDF_CONTEXT, context);
 821         alg.getParam(ParamName::KBKDF_FIXED_INPUT, fixed);
 822         auto prf = unpack<KdfPrf>(alg, ParamName::KDF_PRF);
 823         auto mode = unpack<KbkdfMode>(alg, ParamName::KBKDF_MODE);
 824         auto location = unpack<KbkdfCounterLocation>(alg, ParamName::KBKDF_COUNTER_LOCATION);
 825
 826         size_t rlen = 32, llen = 32, dummy;
 827         alg.getParam(ParamName::KBKDF_RLEN, rlen);
 828         alg.getParam(ParamName::KBKDF_LLEN, llen);
 829         bool noSeparator = alg.getParam(ParamName::KBKDF_NO_SEPARATOR, dummy);
 830
 831         RawBuffer keyPwdBuf(keyPwd.begin(), keyPwd.end());
 832
 833         TrustZoneContext::Instance().executeKbkdf(secretId,
 834                                                                                           secretPwd,
 835                                                                                           length,
 836                                                                                           label,
 837                                                                                           context,
 838                                                                                           fixed,
 839                                                                                           toTzPrf(prf),
 840                                                                                           toTzKbkdfMode(mode),
 841                                                                                           toTzCtrLoc(location),
 842                                                                                           rlen,
 843                                                                                           llen,
 844                                                                                           noSeparator,
 845                                                                                           keyPwdBuf,
 846                                                                                           keyPwdIV,
 847                                                                                           keyTag,
 848                                                                                           keyHash);
 849 }
 850
 851 size_t maxChunkSize()
 852 {
 853         return TrustZoneContext::Instance().getMaxChunkSize();
 854 }
 855
 856 } // namespace Internals
 857 } // namespace TZ
 858 } // namespace Crypto
 859 } // namespace CKM