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                         ctrLenOrTagSizeBits = Params::DEFAULT_AES_GCM_TAG_LEN_BITS;
 222                         alg.getParam(ParamName::ED_TAG_LEN, ctrLenOrTagSizeBits);
 223                         alg.getParam(ParamName::ED_AAD, aad);
 224                         break;
 225                 case AlgoType::RSA_OAEP:
 226                         break;
 227                 default:
 228                         ThrowErr(Exc::Crypto::InputParam, "Invalid decryption algorithm");
 229                         break;
 230         }
 231 }
 232
 233 } // namespace
 234
 235 RawBuffer generateIV()
 236 {
 237         RawBuffer result;
 238         TrustZoneContext::Instance().generateIV(result);
 239         return result;
 240 }
 241
 242 void generateSKey(const CryptoAlgorithm &alg,
 243                                 const Password &pwd,
 244                                 const RawBuffer &iv,
 245                                 RawBuffer &tag,
 246                                 const RawBuffer &hash)
 247 {
 248         AlgoType keyType = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 249         int keyBits = unpack<int>(alg, ParamName::GEN_KEY_LEN);
 250
 251         if (!pwd.empty()) {
 252                 if (iv.empty()) {
 253                         ThrowErr(Exc::InputParam, "Key generation with password encryption requires an IV");
 254                 }
 255
 256                 RawBuffer pwdBuf(pwd.begin(), pwd.end());
 257                 TrustZoneContext::Instance().generateSKeyPwd(getGenSKeyType(keyType),
 258                                                                                                         pwdBuf, iv, keyBits,
 259                                                                                                         tag, hash);
 260         } else {
 261                 TrustZoneContext::Instance().generateSKey(getGenSKeyType(keyType), keyBits,
 262                                                                                                 hash);
 263         }
 264
 265 }
 266
 267 AlgoType generateAKey(const CryptoAlgorithm &alg,
 268                                         const Password &pubPwd,
 269                                         const Password &privPwd,
 270                                         const RawBuffer &pubPwdIv,
 271                                         const RawBuffer &privPwdIv,
 272                                         RawBuffer &pubTag,
 273                                         RawBuffer &privTag,
 274                                         const RawBuffer &hashPriv,
 275                                         const RawBuffer &hashPub)
 276 {
 277         AlgoType keyType = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 278
 279         RawBuffer pubPwdBuf;
 280         if (!pubPwd.empty())
 281                 pubPwdBuf.assign(pubPwd.begin(), pubPwd.end());
 282
 283         RawBuffer privPwdBuf;
 284         if (!privPwd.empty())
 285                 privPwdBuf.assign(privPwd.begin(), privPwd.end());
 286
 287         switch (keyType) {
 288         case AlgoType::RSA_GEN: {
 289                 int keyBits = unpack<int>(alg, ParamName::GEN_KEY_LEN);
 290                 TrustZoneContext::Instance().generateRSAKey(keyBits,
 291                                                                                                         pubPwdBuf,
 292                                                                                                         pubPwdIv,
 293                                                                                                         privPwdBuf,
 294                                                                                                         privPwdIv,
 295                                                                                                         pubTag,
 296                                                                                                         privTag,
 297                                                                                                         hashPriv,
 298                                                                                                         hashPub);
 299                 break;
 300         }
 301         case AlgoType::DSA_GEN: {
 302                 int keyBits = unpack<int>(alg, ParamName::GEN_KEY_LEN);
 303                 RawBuffer prime;
 304                 RawBuffer subprime;
 305                 RawBuffer base;
 306                 generateDSAParams(keyBits, prime, subprime, base);
 307                 TrustZoneContext::Instance().generateDSAKey(keyBits,
 308                                                                                                         prime,
 309                                                                                                         subprime,
 310                                                                                                         base,
 311                                                                                                         pubPwdBuf,
 312                                                                                                         pubPwdIv,
 313                                                                                                         privPwdBuf,
 314                                                                                                         privPwdIv,
 315                                                                                                         pubTag,
 316                                                                                                         privTag,
 317                                                                                                         hashPriv,
 318                                                                                                         hashPub);
 319                 break;
 320         }
 321         case AlgoType::ECDSA_GEN: {
 322                 CKM::ElipticCurve ec = unpack<CKM::ElipticCurve>(alg, ParamName::GEN_EC);
 323                 TrustZoneContext::Instance().generateECKey(toTzEc(ec),
 324                                                                                                    pubPwdBuf,
 325                                                                                                    pubPwdIv,
 326                                                                                                    privPwdBuf,
 327                                                                                                    privPwdIv,
 328                                                                                                    pubTag,
 329                                                                                                    privTag,
 330                                                                                                    hashPriv,
 331                                                                                                    hashPub);
 332                 break;
 333         }
 334         default: {
 335                 ThrowErr(Exc::Crypto::InputParam,
 336                         "Invalid algo type provided for generateAKey function");
 337         }
 338         }
 339
 340         return keyType;
 341 }
 342
 343 void destroyKey(const RawBuffer &keyId)
 344 {
 345         TrustZoneContext::Instance().executeDestroy(keyId);
 346 }
 347
 348 void importData(const Data &data,
 349                                          const EncryptionParams &encData,
 350                                          const Password &pwd,
 351                                          const RawBuffer &pwdIV,
 352                                          RawBuffer &tag,
 353                                          const RawBuffer &hash)
 354 {
 355
 356         const auto dataType = toTzDataType(data.type);
 357
 358         RawBuffer pwdBuf(pwd.begin(), pwd.end());
 359         uint32_t keySizeBits = data.data.size() * 8;
 360         TrustZoneContext::Instance().importData(dataType,
 361                                                                                 data.data,
 362                                                                                 encData,
 363                                                                                 pwdBuf,
 364                                                                                 pwdIV,
 365                                                                                 keySizeBits,
 366                                                                                 tag,
 367                                                                                 hash);
 368 }
 369
 370 void importWrappedKey(const RawBuffer &wrappingKeyId,
 371                                           const Pwd &wrappingKeyPwd,
 372                                           const CryptoAlgorithm &alg,
 373                                           const Data &encryptedKey,
 374                                           const Password &encryptedKeyPassword,
 375                                           const RawBuffer &encryptedKeyIV,
 376                                           RawBuffer &encryptedKeyTag,
 377                                           const RawBuffer &encryptedKeyId)
 378 {
 379         RawBuffer encryptedKeyPwdBuf(encryptedKeyPassword.begin(), encryptedKeyPassword.end());
 380
 381         AlgoType algo;
 382         uint32_t ctrLenOrTagSizeBits = 0;
 383         RawBuffer iv;
 384         RawBuffer aad;
 385         decompose(alg, algo, ctrLenOrTagSizeBits, iv, aad);
 386
 387         // TODO it is awful!
 388         TrustZoneContext::Instance().importWrappedKey(wrappingKeyId,
 389                                                                                                   wrappingKeyPwd,
 390                                                                                                   getAlgType(algo),
 391                                                                                                   iv,
 392                                                                                                   ctrLenOrTagSizeBits,
 393                                                                                                   aad,
 394                                                                                                   toTzDataType(encryptedKey.type),
 395                                                                                                   encryptedKey.data,
 396                                                                                                   encryptedKeyPwdBuf,
 397                                                                                                   encryptedKeyIV,
 398                                                                                                   encryptedKeyTag,
 399                                                                                                   encryptedKeyId);
 400 }
 401
 402 RawBuffer exportWrappedKey(const RawBuffer &wrappingKeyId,
 403                                                    const Pwd &wrappingKeyPwd,
 404                                                    const CryptoAlgorithm &alg,
 405                                                    const RawBuffer &keyToWrapId,
 406                                                    const Pwd &keyToWrapPwd,
 407                                                    const DataType &keyToWrapType)
 408 {
 409         AlgoType algo;
 410         uint32_t ctrLenOrTagSizeBits = 0;
 411         RawBuffer iv;
 412         RawBuffer aad;
 413         decompose(alg, algo, ctrLenOrTagSizeBits, iv, aad);
 414
 415         // TODO it is awful!
 416         return TrustZoneContext::Instance().exportWrappedKey(wrappingKeyId,
 417                                                                                                                  wrappingKeyPwd,
 418                                                                                                                  getAlgType(algo),
 419                                                                                                                  iv,
 420                                                                                                                  ctrLenOrTagSizeBits,
 421                                                                                                                  aad,
 422                                                                                                                  keyToWrapId,
 423                                                                                                                  keyToWrapPwd,
 424                                                                                                                  toTzDataType(keyToWrapType));
 425 }
 426
 427 RawBuffer getData(const RawBuffer &dataId,
 428                                   const Pwd &pwd,
 429                                   const DataType &type)
 430 {
 431         RawBuffer result;
 432         TrustZoneContext::Instance().getData(dataId,
 433                                  pwd,
 434                                  toTzDataType(type),
 435                                  result);
 436         return result;
 437 }
 438
 439 void destroyData(const RawBuffer &dataId)
 440 {
 441         TrustZoneContext::Instance().destroyData(dataId);
 442 }
 443
 444 BufferPair encryptDataAesGcm(const RawBuffer &keyId,
 445                                                         const Pwd &pwd,
 446                                                         const RawBuffer &iv,
 447                                                         int tagSize,
 448                                                         const RawBuffer &data,
 449                                                         const RawBuffer &aad)
 450 {
 451         RawBuffer result;
 452         RawBuffer tag;
 453
 454         TrustZoneContext::Instance().executeEncryptAE(keyId, pwd, iv, tagSize,
 455                                                                                                 aad, data, result, tag);
 456
 457         return std::make_pair(result, tag);
 458 }
 459
 460 RawBuffer encryptDataAesGcmPacked(const RawBuffer &keyId,
 461                                                                 const Pwd &pwd,
 462                                                                 const RawBuffer &iv,
 463                                                                 int tagSize,
 464                                                                 const RawBuffer &data,
 465                                                                 const RawBuffer &aad)
 466 {
 467         auto pair = encryptDataAesGcm(keyId, pwd, iv, tagSize, data, aad);
 468         std::copy(pair.second.begin(), pair.second.end(),
 469                         std::back_inserter(pair.first));
 470         return pair.first;
 471 }
 472
 473 RawBuffer decryptDataAesGcm(const RawBuffer &keyId,
 474                                                         const Pwd &pwd,
 475                                                         const RawBuffer &iv,
 476                                                         int tagSizeBits,
 477                                                         const RawBuffer &tag,
 478                                                         const RawBuffer &data,
 479                                                         const RawBuffer &aad)
 480 {
 481         RawBuffer result;
 482
 483         TrustZoneContext::Instance().executeDecryptAE(keyId, pwd, iv, tagSizeBits,
 484                                                                                                 tag, aad, data, result);
 485
 486         return result;
 487 }
 488
 489 RawBuffer decryptDataAesGcmPacked(const RawBuffer &keyId,
 490                                                                 const Pwd &pwd,
 491                                                                 const RawBuffer &iv,
 492                                                                 int tagSizeBits,
 493                                                                 const RawBuffer &data,
 494                                                                 const RawBuffer &aad)
 495 {
 496         int tagSizeBytes = tagSizeBits / 8;
 497         if (tagSizeBytes > static_cast<int>(data.size()))
 498                 ThrowErr(Exc::Crypto::InputParam, "Wrong size of tag");
 499
 500         auto tagPos = data.data() + data.size() - tagSizeBytes;
 501         return decryptDataAesGcm(keyId,
 502                                                         pwd,
 503                                                         iv,
 504                                                         tagSizeBits,
 505                                                         RawBuffer(tagPos, data.data() + data.size()),
 506                                                         RawBuffer(data.data(), tagPos),
 507                                                         aad);
 508 }
 509
 510
 511 RawBuffer symmetricEncrypt(const RawBuffer &keyId,
 512                                                 const Pwd &pwd,
 513                                                 const CryptoAlgorithm &alg,
 514                                                 const RawBuffer &data)
 515 {
 516         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 517         uint64_t ctrLen = 0;
 518
 519         switch (algo) {
 520                 case AlgoType::AES_CTR: {
 521                         ctrLen = unpack<uint64_t>(alg, ParamName::ED_CTR_LEN);
 522                         // counter length is in bits
 523                         if (ctrLen != Params::DEFAULT_AES_IV_LEN * 8) {
 524                                 LogError("CTR length invalid: " << std::to_string(ctrLen));
 525                                 ThrowErr(Exc::Crypto::InputParam, "Invalid CTR length");
 526                         }
 527                         // no break here, we still need to slide down to executeCrypt
 528                         fallthru;
 529                 }
 530                 case AlgoType::AES_CBC:
 531                 case AlgoType::AES_CFB: {
 532                         RawBuffer result;
 533                         TrustZoneContext::Instance().executeCrypt(CMD_ENCRYPT,
 534                                                                                                         getAlgType(algo),
 535                                                                                                         keyId,
 536                                                                                                         pwd,
 537                                                                                                         unpack<RawBuffer>(alg, ParamName::ED_IV),
 538                                                                                                         data,
 539                                                                                                         result);
 540                         return result;
 541                 }
 542                 case AlgoType::AES_GCM: {
 543                         int tagLenBits = Params::DEFAULT_AES_GCM_TAG_LEN_BITS;
 544                         alg.getParam(ParamName::ED_TAG_LEN, tagLenBits);
 545                         RawBuffer aad;
 546                         alg.getParam(ParamName::ED_AAD, aad);
 547                         return encryptDataAesGcmPacked(keyId,
 548                                                                                 pwd,
 549                                                                                 unpack<RawBuffer>(alg, ParamName::ED_IV),
 550                                                                                 tagLenBits,
 551                                                                                 data,
 552                                                                                 aad);
 553                 }
 554                 default:
 555                         break;
 556         }
 557
 558         ThrowErr(Exc::Crypto::OperationNotSupported,
 559                                 "Incorrect algorithm provided for symmetric crypto operation");
 560 }
 561
 562 RawBuffer symmetricDecrypt(const RawBuffer &keyId,
 563                                                 const Pwd &pwd,
 564                                                 const CryptoAlgorithm &alg,
 565                                                 const RawBuffer &data)
 566 {
 567         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 568         uint64_t ctrLen = 0;
 569
 570         switch (algo) {
 571                 case AlgoType::AES_CTR: {
 572                         ctrLen = unpack<uint64_t>(alg, ParamName::ED_CTR_LEN);
 573                         // counter length is in bits
 574                         if (ctrLen != Params::DEFAULT_AES_IV_LEN * 8) {
 575                                 LogError("CTR length invalid: " << std::to_string(ctrLen));
 576                                 ThrowErr(Exc::Crypto::InputParam, "Invalid CTR length");
 577                         }
 578                         // no break here, we still need to slide down to executeCrypt
 579                         fallthru;
 580                 }
 581                 case AlgoType::AES_CBC:
 582                 case AlgoType::AES_CFB: {
 583                         RawBuffer result;
 584                         TrustZoneContext::Instance().executeCrypt(CMD_DECRYPT,
 585                                                                                                         getAlgType(algo),
 586                                                                                                         keyId,
 587                                                                                                         pwd,
 588                                                                                                         unpack<RawBuffer>(alg, ParamName::ED_IV),
 589                                                                                                         data,
 590                                                                                                         result);
 591                         return result;
 592                 }
 593                 case AlgoType::AES_GCM: {
 594                         int tagSizeBits = Params::DEFAULT_AES_GCM_TAG_LEN_BITS;
 595                         alg.getParam(ParamName::ED_TAG_LEN, tagSizeBits);
 596                         RawBuffer aad;
 597                         alg.getParam(ParamName::ED_AAD, aad);
 598                         return decryptDataAesGcmPacked(keyId,
 599                                                                                 pwd,
 600                                                                                 unpack<RawBuffer>(alg, ParamName::ED_IV),
 601                                                                                 tagSizeBits,
 602                                                                                 data,
 603                                                                                 aad);
 604                 }
 605                 default:
 606                         break;
 607         }
 608
 609         ThrowErr(Exc::Crypto::OperationNotSupported,
 610                                 "Incorrect algorithm provided for symmetric crypto operation");
 611 }
 612
 613 RawBuffer asymmetricEncrypt(const RawBuffer &keyId,
 614                                                         const Pwd &pwd,
 615                                                         const CryptoAlgorithm &alg,
 616                                                         const RawBuffer &data)
 617 {
 618         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 619         RawBuffer result;
 620
 621         switch (algo)
 622         {
 623         case AlgoType::RSA_OAEP: {
 624                 TrustZoneContext::Instance().executeCrypt(CMD_ENCRYPT,
 625                                                                                                 getAlgType(algo),
 626                                                                                                 keyId,
 627                                                                                                 pwd,
 628                                                                                                 result, // unused dummy
 629                                                                                                 data,
 630                                                                                                 result);
 631                 return result;
 632         }
 633         default:
 634                 break;
 635         }
 636
 637         ThrowErr(Exc::Crypto::OperationNotSupported,
 638                                 "Incorrect algorithm provided for asymmetric crypto operation");
 639 }
 640
 641 RawBuffer asymmetricDecrypt(const RawBuffer &keyId,
 642                                                         const Pwd &pwd,
 643                                                         const CryptoAlgorithm &alg,
 644                                                         const RawBuffer &cipher)
 645 {
 646         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 647         RawBuffer result;
 648
 649         switch (algo)
 650         {
 651         case AlgoType::RSA_OAEP: {
 652                 TrustZoneContext::Instance().executeCrypt(CMD_DECRYPT,
 653                                                                                                 getAlgType(algo),
 654                                                                                                 keyId,
 655                                                                                                 pwd,
 656                                                                                                 result, // unused dummy
 657                                                                                                 cipher,
 658                                                                                                 result);
 659                 return result;
 660         }
 661         default:
 662                 break;
 663         }
 664
 665         ThrowErr(Exc::Crypto::OperationNotSupported,
 666                                 "Incorrect algorithm provided for asymmetric crypto operation");
 667 }
 668
 669 uint32_t initCipher(const RawBuffer &keyId,
 670                                         const Pwd &pwd,
 671                                         const CryptoAlgorithm &alg,
 672                                         bool encrypt)
 673 {
 674         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 675
 676         switch (algo)
 677         {
 678         case AlgoType::AES_GCM: {
 679                 int tagSizeBits = Params::DEFAULT_AES_GCM_TAG_LEN_BITS;
 680                 alg.getParam(ParamName::ED_TAG_LEN, tagSizeBits);
 681                 RawBuffer aad;
 682                 alg.getParam(ParamName::ED_AAD, aad);
 683                 return TrustZoneContext::Instance().initGcmCipher(encrypt ? CIPHER_ENCRYPT : CIPHER_DECRYPT,
 684                                                                                                                   keyId,
 685                                                                                                                   pwd,
 686                                                                                                                   unpack<RawBuffer>(alg, ParamName::ED_IV),
 687                                                                                                                   tagSizeBits,
 688                                                                                                                   aad);
 689         }
 690         case AlgoType::AES_CBC:
 691         case AlgoType::AES_CTR:
 692         case AlgoType::AES_CFB:
 693                 // TODO optionally implement above modes as well
 694         default:
 695                 break;
 696         };
 697
 698         ThrowErr(Exc::Crypto::OperationNotSupported,
 699                          "Incorrect algorithm provided for symmetric crypto operation");
 700 }
 701
 702 void addAAD(uint32_t opId,
 703                         const RawBuffer &aad)
 704 {
 705         TrustZoneContext::Instance().addGcmAAD(opId, aad);
 706 }
 707
 708 RawBuffer updateCipher(uint32_t opId,
 709                                            const RawBuffer &data)
 710 {
 711         return TrustZoneContext::Instance().updateGcmCipher(opId, data);
 712 }
 713
 714 RawBuffer finalizeCipher(uint32_t opId,
 715                                                  const RawBuffer &data)
 716 {
 717         return TrustZoneContext::Instance().finalizeGcmCipher(opId, data);
 718 }
 719
 720 void cleanupCipher(uint32_t opId)
 721 {
 722         return TrustZoneContext::Instance().cleanupCipher(opId);
 723 }
 724
 725 RawBuffer sign(const RawBuffer &pkeyId,
 726                         const Pwd &pwd,
 727                         const CryptoAlgorithm &alg,
 728                         const RawBuffer &message)
 729 {
 730         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 731         HashAlgorithm hash = unpack<HashAlgorithm>(alg, ParamName::SV_HASH_ALGO);
 732         if (algo != AlgoType::RSA_SV && hash == HashAlgorithm::NONE)
 733                 ThrowErr(Exc::Crypto::InputParam, "Only RSA supports no hash option");
 734
 735         RawBuffer signature;
 736         TrustZoneContext::Instance().executeSign(getAlgType(algo),
 737                                                                                         getHashType(hash),
 738                                                                                         pkeyId,
 739                                                                                         pwd,
 740                                                                                         message,
 741                                                                                         signature);
 742         return signature;
 743 }
 744
 745 int verify(const RawBuffer &pkeyId,
 746                 const Pwd &pwd,
 747                 const CryptoAlgorithm &alg,
 748                 const RawBuffer &message,
 749                 const RawBuffer &signature)
 750 {
 751         AlgoType algo = unpack<AlgoType>(alg, ParamName::ALGO_TYPE);
 752         HashAlgorithm hash = unpack<HashAlgorithm>(alg, ParamName::SV_HASH_ALGO);
 753         if (algo != AlgoType::RSA_SV && hash == HashAlgorithm::NONE)
 754                 ThrowErr(Exc::Crypto::InputParam, "Only RSA supports no hash option");
 755
 756         return TrustZoneContext::Instance().executeVerify(getAlgType(algo),
 757                                                                                                         getHashType(hash),
 758                                                                                                         pkeyId,
 759                                                                                                         pwd,
 760                                                                                                         message,
 761                                                                                                         signature);
 762 }
 763
 764 void deriveECDH(const RawBuffer &prvKeyId,
 765                                 const Pwd &prvKeyPwd,
 766                                 const RawBuffer &pubKey,
 767                                 const Password &secretPwd,
 768                                 const RawBuffer &secretPwdIV,
 769                                 RawBuffer &secretTag,
 770                                 const RawBuffer &secretHash)
 771 {
 772         auto peerKey = std::make_shared<KeyImpl>(pubKey);
 773         if (peerKey->getType() != KeyType::KEY_ECDSA_PUBLIC)
 774                 ThrowErr(Exc::Crypto::InputParam, "ECDH requires peer's public EC key");
 775         auto peerEvp = peerKey->getEvpShPtr().get();
 776         assert(peerEvp);
 777
 778         int subType = EVP_PKEY_type(EVP_PKEY_id(peerEvp));
 779         if (subType != EVP_PKEY_EC)
 780                 ThrowErr(Exc::Crypto::InputParam, "Invalid key type: ", subType);
 781
 782         auto ecKey = EVP_PKEY_get0_EC_KEY(peerEvp);
 783         if (!ecKey)
 784                 ThrowErr(Exc::Crypto::InternalError, "Can't get EC key");
 785
 786         auto ecPoint = EC_KEY_get0_public_key(ecKey);
 787         if (!ecPoint)
 788                 ThrowErr(Exc::Crypto::InternalError, "Can't get EC public key");
 789
 790         auto ecGroup = EC_KEY_get0_group(ecKey);
 791         if (!ecGroup)
 792                 ThrowErr(Exc::Crypto::InternalError, "Can't get EC group");
 793
 794         BIGNUM *x = BN_new();
 795         BIGNUM *y = BN_new();
 796         if (!EC_POINT_get_affine_coordinates(ecGroup, ecPoint, x, y, NULL))
 797                 ThrowErr(Exc::Crypto::InternalError, "Failed to get EC pub key coordinates");
 798
 799         auto xBuf = extractBignumData(x);
 800         auto yBuf = extractBignumData(y);
 801
 802         RawBuffer secretPwdBuf(secretPwd.begin(), secretPwd.end());
 803
 804         TrustZoneContext::Instance().executeEcdh(prvKeyId,
 805                                                                                          prvKeyPwd,
 806                                                                                          xBuf,
 807                                                                                          yBuf,
 808                                                                                          secretPwdBuf,
 809                                                                                          secretPwdIV,
 810                                                                                          secretTag,
 811                                                                                          secretHash);
 812 }
 813
 814 void deriveKBKDF(const RawBuffer &secretId,
 815                                  const Pwd &secretPwd,
 816                                  const CryptoAlgorithm &alg,
 817                                  const Password &keyPwd,
 818                                  const RawBuffer &keyPwdIV,
 819                                  RawBuffer &keyTag,
 820                                  const RawBuffer &keyHash)
 821 {
 822         RawBuffer label, context, fixed;
 823         size_t length;
 824         alg.getParam(ParamName::KDF_LEN, length);
 825         alg.getParam(ParamName::KBKDF_LABEL, label);
 826         alg.getParam(ParamName::KBKDF_CONTEXT, context);
 827         alg.getParam(ParamName::KBKDF_FIXED_INPUT, fixed);
 828         auto prf = unpack<KdfPrf>(alg, ParamName::KDF_PRF);
 829         auto mode = unpack<KbkdfMode>(alg, ParamName::KBKDF_MODE);
 830         auto location = unpack<KbkdfCounterLocation>(alg, ParamName::KBKDF_COUNTER_LOCATION);
 831
 832         size_t rlen = 32, llen = 32, dummy;
 833         alg.getParam(ParamName::KBKDF_RLEN, rlen);
 834         alg.getParam(ParamName::KBKDF_LLEN, llen);
 835         bool noSeparator = alg.getParam(ParamName::KBKDF_NO_SEPARATOR, dummy);
 836
 837         RawBuffer keyPwdBuf(keyPwd.begin(), keyPwd.end());
 838
 839         TrustZoneContext::Instance().executeKbkdf(secretId,
 840                                                                                           secretPwd,
 841                                                                                           length,
 842                                                                                           label,
 843                                                                                           context,
 844                                                                                           fixed,
 845                                                                                           toTzPrf(prf),
 846                                                                                           toTzKbkdfMode(mode),
 847                                                                                           toTzCtrLoc(location),
 848                                                                                           rlen,
 849                                                                                           llen,
 850                                                                                           noSeparator,
 851                                                                                           keyPwdBuf,
 852                                                                                           keyPwdIV,
 853                                                                                           keyTag,
 854                                                                                           keyHash);
 855 }
 856
 857 size_t maxChunkSize()
 858 {
 859         return TrustZoneContext::Instance().getMaxChunkSize();
 860 }
 861
 862 } // namespace Internals
 863 } // namespace TZ
 864 } // namespace Crypto
 865 } // namespace CKM