| /* |
| * Copyright 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <openssl/evp.h> |
| #include <openssl/x509.h> |
| |
| #include <keymaster/key_blob.h> |
| #include <keymaster/keymaster_defs.h> |
| |
| #include "asymmetric_key.h" |
| #include "dsa_operation.h" |
| #include "ecdsa_operation.h" |
| #include "openssl_utils.h" |
| #include "rsa_operation.h" |
| |
| namespace keymaster { |
| |
| const uint32_t RSA_DEFAULT_KEY_SIZE = 2048; |
| const uint64_t RSA_DEFAULT_EXPONENT = 65537; |
| |
| const uint32_t DSA_DEFAULT_KEY_SIZE = 2048; |
| |
| const uint32_t ECDSA_DEFAULT_KEY_SIZE = 192; |
| |
| keymaster_error_t AsymmetricKey::LoadKey(const KeyBlob& blob) { |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete> evp_key(EVP_PKEY_new()); |
| if (evp_key.get() == NULL) |
| return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| |
| EVP_PKEY* tmp_pkey = evp_key.get(); |
| const uint8_t* key_material = blob.key_material(); |
| if (d2i_PrivateKey(evp_key_type(), &tmp_pkey, &key_material, blob.key_material_length()) == |
| NULL) { |
| return KM_ERROR_INVALID_KEY_BLOB; |
| } |
| if (!EvpToInternal(evp_key.get())) |
| return KM_ERROR_UNKNOWN_ERROR; |
| |
| return KM_ERROR_OK; |
| } |
| |
| keymaster_error_t AsymmetricKey::key_material(UniquePtr<uint8_t[]>* material, size_t* size) const { |
| if (material == NULL || size == NULL) |
| return KM_ERROR_OUTPUT_PARAMETER_NULL; |
| |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new()); |
| if (pkey.get() == NULL) |
| return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| |
| if (!InternalToEvp(pkey.get())) |
| return KM_ERROR_UNKNOWN_ERROR; |
| |
| *size = i2d_PrivateKey(pkey.get(), NULL /* key_data*/); |
| if (*size <= 0) |
| return KM_ERROR_UNKNOWN_ERROR; |
| |
| material->reset(new uint8_t[*size]); |
| uint8_t* tmp = material->get(); |
| i2d_PrivateKey(pkey.get(), &tmp); |
| |
| return KM_ERROR_OK; |
| } |
| |
| keymaster_error_t AsymmetricKey::formatted_key_material(keymaster_key_format_t format, |
| UniquePtr<uint8_t[]>* material, |
| size_t* size) const { |
| if (format != KM_KEY_FORMAT_X509) |
| return KM_ERROR_UNSUPPORTED_KEY_FORMAT; |
| |
| if (material == NULL || size == NULL) |
| return KM_ERROR_OUTPUT_PARAMETER_NULL; |
| |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new()); |
| if (!InternalToEvp(pkey.get())) |
| return KM_ERROR_UNKNOWN_ERROR; |
| |
| int key_data_length = i2d_PUBKEY(pkey.get(), NULL); |
| if (key_data_length <= 0) |
| return KM_ERROR_UNKNOWN_ERROR; |
| |
| material->reset(new uint8_t[key_data_length]); |
| if (material->get() == NULL) |
| return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| |
| uint8_t* tmp = material->get(); |
| if (i2d_PUBKEY(pkey.get(), &tmp) != key_data_length) { |
| material->reset(); |
| return KM_ERROR_UNKNOWN_ERROR; |
| } |
| |
| *size = key_data_length; |
| return KM_ERROR_OK; |
| } |
| |
| Operation* AsymmetricKey::CreateOperation(keymaster_purpose_t purpose, keymaster_error_t* error) { |
| keymaster_digest_t digest; |
| if (!authorizations().GetTagValue(TAG_DIGEST, &digest) || digest != KM_DIGEST_NONE) { |
| *error = KM_ERROR_UNSUPPORTED_DIGEST; |
| return NULL; |
| } |
| |
| keymaster_padding_t padding; |
| if (!authorizations().GetTagValue(TAG_PADDING, &padding) || padding != KM_PAD_NONE) { |
| *error = KM_ERROR_UNSUPPORTED_PADDING_MODE; |
| return NULL; |
| } |
| |
| return CreateOperation(purpose, digest, padding, error); |
| } |
| |
| /* static */ |
| RsaKey* RsaKey::GenerateKey(const AuthorizationSet& key_description, const Logger& logger, |
| keymaster_error_t* error) { |
| if (!error) |
| return NULL; |
| |
| AuthorizationSet authorizations(key_description); |
| |
| uint64_t public_exponent = RSA_DEFAULT_EXPONENT; |
| if (!authorizations.GetTagValue(TAG_RSA_PUBLIC_EXPONENT, &public_exponent)) |
| authorizations.push_back(Authorization(TAG_RSA_PUBLIC_EXPONENT, public_exponent)); |
| |
| uint32_t key_size = RSA_DEFAULT_KEY_SIZE; |
| if (!authorizations.GetTagValue(TAG_KEY_SIZE, &key_size)) |
| authorizations.push_back(Authorization(TAG_KEY_SIZE, key_size)); |
| |
| UniquePtr<BIGNUM, BIGNUM_Delete> exponent(BN_new()); |
| UniquePtr<RSA, RSA_Delete> rsa_key(RSA_new()); |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new()); |
| if (rsa_key.get() == NULL || pkey.get() == NULL) { |
| *error = KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return NULL; |
| } |
| |
| if (!BN_set_word(exponent.get(), public_exponent) || |
| !RSA_generate_key_ex(rsa_key.get(), key_size, exponent.get(), NULL /* callback */)) { |
| *error = KM_ERROR_UNKNOWN_ERROR; |
| return NULL; |
| } |
| |
| RsaKey* new_key = new RsaKey(rsa_key.release(), authorizations, logger); |
| *error = new_key ? KM_ERROR_OK : KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return new_key; |
| } |
| |
| /* static */ |
| RsaKey* RsaKey::ImportKey(const AuthorizationSet& key_description, EVP_PKEY* pkey, |
| const Logger& logger, keymaster_error_t* error) { |
| if (!error) |
| return NULL; |
| *error = KM_ERROR_UNKNOWN_ERROR; |
| |
| UniquePtr<RSA, RSA_Delete> rsa_key(EVP_PKEY_get1_RSA(pkey)); |
| if (!rsa_key.get()) |
| return NULL; |
| |
| AuthorizationSet authorizations(key_description); |
| |
| uint64_t public_exponent; |
| if (authorizations.GetTagValue(TAG_RSA_PUBLIC_EXPONENT, &public_exponent)) { |
| // public_exponent specified, make sure it matches the key |
| UniquePtr<BIGNUM, BIGNUM_Delete> public_exponent_bn(BN_new()); |
| if (!BN_set_word(public_exponent_bn.get(), public_exponent)) |
| return NULL; |
| if (BN_cmp(public_exponent_bn.get(), rsa_key->e) != 0) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| } else { |
| // public_exponent not specified, use the one from the key. |
| public_exponent = BN_get_word(rsa_key->e); |
| if (public_exponent == 0xffffffffL) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| authorizations.push_back(TAG_RSA_PUBLIC_EXPONENT, public_exponent); |
| } |
| |
| uint32_t key_size; |
| if (authorizations.GetTagValue(TAG_KEY_SIZE, &key_size)) { |
| // key_size specified, make sure it matches the key. |
| if (RSA_size(rsa_key.get()) != (int)key_size) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| } else { |
| key_size = RSA_size(rsa_key.get()) * 8; |
| authorizations.push_back(TAG_KEY_SIZE, key_size); |
| } |
| |
| keymaster_algorithm_t algorithm; |
| if (authorizations.GetTagValue(TAG_ALGORITHM, &algorithm)) { |
| if (algorithm != KM_ALGORITHM_RSA) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| } else { |
| authorizations.push_back(TAG_ALGORITHM, KM_ALGORITHM_RSA); |
| } |
| |
| // Don't bother with the other parameters. If the necessary padding, digest, purpose, etc. are |
| // missing, the error will be diagnosed when the key is used (when auth checking is |
| // implemented). |
| *error = KM_ERROR_OK; |
| return new RsaKey(rsa_key.release(), authorizations, logger); |
| } |
| |
| RsaKey::RsaKey(const KeyBlob& blob, const Logger& logger, keymaster_error_t* error) |
| : AsymmetricKey(blob, logger) { |
| if (error) |
| *error = LoadKey(blob); |
| } |
| |
| Operation* RsaKey::CreateOperation(keymaster_purpose_t purpose, keymaster_digest_t digest, |
| keymaster_padding_t padding, keymaster_error_t* error) { |
| Operation* op; |
| switch (purpose) { |
| case KM_PURPOSE_SIGN: |
| op = new RsaSignOperation(purpose, logger_, digest, padding, rsa_key_.release()); |
| break; |
| case KM_PURPOSE_VERIFY: |
| op = new RsaVerifyOperation(purpose, logger_, digest, padding, rsa_key_.release()); |
| break; |
| default: |
| *error = KM_ERROR_UNIMPLEMENTED; |
| return NULL; |
| } |
| *error = op ? KM_ERROR_OK : KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return op; |
| } |
| |
| bool RsaKey::EvpToInternal(const EVP_PKEY* pkey) { |
| rsa_key_.reset(EVP_PKEY_get1_RSA(const_cast<EVP_PKEY*>(pkey))); |
| return rsa_key_.get() != NULL; |
| } |
| |
| bool RsaKey::InternalToEvp(EVP_PKEY* pkey) const { |
| return EVP_PKEY_set1_RSA(pkey, rsa_key_.get()) == 1; |
| } |
| |
| template <keymaster_tag_t Tag> |
| static void GetDsaParamData(const AuthorizationSet& auths, TypedTag<KM_BIGNUM, Tag> tag, |
| keymaster_blob_t* blob) { |
| if (!auths.GetTagValue(tag, blob)) |
| blob->data = NULL; |
| } |
| |
| // Store the specified DSA param in auths |
| template <keymaster_tag_t Tag> |
| static void SetDsaParamData(AuthorizationSet* auths, TypedTag<KM_BIGNUM, Tag> tag, BIGNUM* number) { |
| keymaster_blob_t blob; |
| convert_bn_to_blob(number, &blob); |
| auths->push_back(Authorization(tag, blob)); |
| delete[] blob.data; |
| } |
| |
| DsaKey* DsaKey::GenerateKey(const AuthorizationSet& key_description, const Logger& logger, |
| keymaster_error_t* error) { |
| if (!error) |
| return NULL; |
| |
| AuthorizationSet authorizations(key_description); |
| |
| keymaster_blob_t g_blob; |
| GetDsaParamData(authorizations, TAG_DSA_GENERATOR, &g_blob); |
| |
| keymaster_blob_t p_blob; |
| GetDsaParamData(authorizations, TAG_DSA_P, &p_blob); |
| |
| keymaster_blob_t q_blob; |
| GetDsaParamData(authorizations, TAG_DSA_Q, &q_blob); |
| |
| uint32_t key_size = DSA_DEFAULT_KEY_SIZE; |
| if (!authorizations.GetTagValue(TAG_KEY_SIZE, &key_size)) |
| authorizations.push_back(Authorization(TAG_KEY_SIZE, key_size)); |
| |
| UniquePtr<DSA, DSA_Delete> dsa_key(DSA_new()); |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new()); |
| if (dsa_key.get() == NULL || pkey.get() == NULL) { |
| *error = KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return NULL; |
| } |
| |
| // If anything goes wrong in the next section, it's a param problem. |
| *error = KM_ERROR_INVALID_DSA_PARAMS; |
| |
| if (g_blob.data == NULL && p_blob.data == NULL && q_blob.data == NULL) { |
| logger.info("DSA parameters unspecified, generating them for key size %d", key_size); |
| if (!DSA_generate_parameters_ex(dsa_key.get(), key_size, NULL /* seed */, 0 /* seed_len */, |
| NULL /* counter_ret */, NULL /* h_ret */, |
| NULL /* callback */)) { |
| logger.severe("DSA parameter generation failed."); |
| return NULL; |
| } |
| |
| SetDsaParamData(&authorizations, TAG_DSA_GENERATOR, dsa_key->g); |
| SetDsaParamData(&authorizations, TAG_DSA_P, dsa_key->p); |
| SetDsaParamData(&authorizations, TAG_DSA_Q, dsa_key->q); |
| } else if (g_blob.data == NULL || p_blob.data == NULL || q_blob.data == NULL) { |
| logger.severe("Some DSA parameters provided. Provide all or none"); |
| return NULL; |
| } else { |
| // All params provided. Use them. |
| dsa_key->g = BN_bin2bn(g_blob.data, g_blob.data_length, NULL); |
| dsa_key->p = BN_bin2bn(p_blob.data, p_blob.data_length, NULL); |
| dsa_key->q = BN_bin2bn(q_blob.data, q_blob.data_length, NULL); |
| |
| if (dsa_key->g == NULL || dsa_key->p == NULL || dsa_key->q == NULL) { |
| return NULL; |
| } |
| } |
| |
| if (!DSA_generate_key(dsa_key.get())) { |
| *error = KM_ERROR_UNKNOWN_ERROR; |
| return NULL; |
| } |
| |
| DsaKey* new_key = new DsaKey(dsa_key.release(), authorizations, logger); |
| *error = new_key ? KM_ERROR_OK : KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return new_key; |
| } |
| |
| template <keymaster_tag_t T> |
| keymaster_error_t GetOrCheckDsaParam(TypedTag<KM_BIGNUM, T> tag, BIGNUM* bn, |
| AuthorizationSet* auths) { |
| keymaster_blob_t blob; |
| if (auths->GetTagValue(tag, &blob)) { |
| // value specified, make sure it matches |
| UniquePtr<BIGNUM, BIGNUM_Delete> extracted_bn(BN_bin2bn(blob.data, blob.data_length, NULL)); |
| if (extracted_bn.get() == NULL) |
| return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| if (BN_cmp(extracted_bn.get(), bn) != 0) |
| return KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| } else { |
| // value not specified, add it |
| UniquePtr<uint8_t[]> data(new uint8_t[BN_num_bytes(bn)]); |
| BN_bn2bin(bn, data.get()); |
| auths->push_back(tag, data.get(), BN_num_bytes(bn)); |
| } |
| return KM_ERROR_OK; |
| } |
| |
| /* static */ |
| size_t DsaKey::key_size_bits(DSA* dsa_key) { |
| // Openssl provides no convenient way to get a DSA key size, but dsa_key->p is L bits long. |
| // There may be some leading zeros that mess up this calculation, but DSA key sizes are also |
| // constrained to be multiples of 64 bits. So the key size is the bit length of p rounded up to |
| // the nearest 64. |
| return ((BN_num_bytes(dsa_key->p) * 8) + 63) / 64 * 64; |
| } |
| |
| /* static */ |
| DsaKey* DsaKey::ImportKey(const AuthorizationSet& key_description, EVP_PKEY* pkey, |
| const Logger& logger, keymaster_error_t* error) { |
| if (!error) |
| return NULL; |
| *error = KM_ERROR_UNKNOWN_ERROR; |
| |
| UniquePtr<DSA, DSA_Delete> dsa_key(EVP_PKEY_get1_DSA(pkey)); |
| if (!dsa_key.get()) |
| return NULL; |
| |
| AuthorizationSet authorizations(key_description); |
| |
| *error = GetOrCheckDsaParam(TAG_DSA_GENERATOR, dsa_key->g, &authorizations); |
| if (*error != KM_ERROR_OK) |
| return NULL; |
| |
| *error = GetOrCheckDsaParam(TAG_DSA_P, dsa_key->p, &authorizations); |
| if (*error != KM_ERROR_OK) |
| return NULL; |
| |
| *error = GetOrCheckDsaParam(TAG_DSA_Q, dsa_key->q, &authorizations); |
| if (*error != KM_ERROR_OK) |
| return NULL; |
| |
| // There's no convenient way to get a DSA key size, but dsa_key->p is L bits long. There may be |
| // some leading zeros that mess up this calculation, but DSA key sizes are also constrained to |
| // be multiples of 64 bits. So the bit length of p, rounded up to the nearest 64 bits, is the |
| // key size. |
| uint32_t extracted_key_size_bits = ((BN_num_bytes(dsa_key->p) * 8) + 63) / 64 * 64; |
| |
| uint32_t key_size_bits; |
| if (authorizations.GetTagValue(TAG_KEY_SIZE, &key_size_bits)) { |
| // key_size_bits specified, make sure it matches the key. |
| if (key_size_bits != extracted_key_size_bits) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| } else { |
| // key_size_bits not specified, add it. |
| authorizations.push_back(TAG_KEY_SIZE, extracted_key_size_bits); |
| } |
| |
| keymaster_algorithm_t algorithm; |
| if (authorizations.GetTagValue(TAG_ALGORITHM, &algorithm)) { |
| if (algorithm != KM_ALGORITHM_DSA) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| } else { |
| authorizations.push_back(TAG_ALGORITHM, KM_ALGORITHM_DSA); |
| } |
| |
| // Don't bother with the other parameters. If the necessary padding, digest, purpose, etc. are |
| // missing, the error will be diagnosed when the key is used (when auth checking is |
| // implemented). |
| *error = KM_ERROR_OK; |
| return new DsaKey(dsa_key.release(), authorizations, logger); |
| } |
| |
| DsaKey::DsaKey(const KeyBlob& blob, const Logger& logger, keymaster_error_t* error) |
| : AsymmetricKey(blob, logger) { |
| if (error) |
| *error = LoadKey(blob); |
| } |
| |
| Operation* DsaKey::CreateOperation(keymaster_purpose_t purpose, keymaster_digest_t digest, |
| keymaster_padding_t padding, keymaster_error_t* error) { |
| Operation* op; |
| switch (purpose) { |
| case KM_PURPOSE_SIGN: |
| op = new DsaSignOperation(purpose, logger_, digest, padding, dsa_key_.release()); |
| break; |
| case KM_PURPOSE_VERIFY: |
| op = new DsaVerifyOperation(purpose, logger_, digest, padding, dsa_key_.release()); |
| break; |
| default: |
| *error = KM_ERROR_UNIMPLEMENTED; |
| return NULL; |
| } |
| *error = op ? KM_ERROR_OK : KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return op; |
| } |
| |
| bool DsaKey::EvpToInternal(const EVP_PKEY* pkey) { |
| dsa_key_.reset(EVP_PKEY_get1_DSA(const_cast<EVP_PKEY*>(pkey))); |
| return dsa_key_.get() != NULL; |
| } |
| |
| bool DsaKey::InternalToEvp(EVP_PKEY* pkey) const { |
| return EVP_PKEY_set1_DSA(pkey, dsa_key_.get()) == 1; |
| } |
| |
| /* static */ |
| EcdsaKey* EcdsaKey::GenerateKey(const AuthorizationSet& key_description, const Logger& logger, |
| keymaster_error_t* error) { |
| if (!error) |
| return NULL; |
| |
| AuthorizationSet authorizations(key_description); |
| |
| uint32_t key_size = ECDSA_DEFAULT_KEY_SIZE; |
| if (!authorizations.GetTagValue(TAG_KEY_SIZE, &key_size)) |
| authorizations.push_back(Authorization(TAG_KEY_SIZE, key_size)); |
| |
| UniquePtr<EC_KEY, ECDSA_Delete> ecdsa_key(EC_KEY_new()); |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new()); |
| if (ecdsa_key.get() == NULL || pkey.get() == NULL) { |
| *error = KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return NULL; |
| } |
| |
| UniquePtr<EC_GROUP, EC_GROUP_Delete> group(choose_group(key_size)); |
| if (group.get() == NULL) { |
| // Technically, could also have been a memory allocation problem. |
| *error = KM_ERROR_UNSUPPORTED_KEY_SIZE; |
| return NULL; |
| } |
| |
| EC_GROUP_set_point_conversion_form(group.get(), POINT_CONVERSION_UNCOMPRESSED); |
| EC_GROUP_set_asn1_flag(group.get(), OPENSSL_EC_NAMED_CURVE); |
| |
| if (EC_KEY_set_group(ecdsa_key.get(), group.get()) != 1 || |
| EC_KEY_generate_key(ecdsa_key.get()) != 1 || EC_KEY_check_key(ecdsa_key.get()) < 0) { |
| *error = KM_ERROR_UNKNOWN_ERROR; |
| return NULL; |
| } |
| |
| EcdsaKey* new_key = new EcdsaKey(ecdsa_key.release(), authorizations, logger); |
| *error = new_key ? KM_ERROR_OK : KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return new_key; |
| } |
| |
| /* static */ |
| EcdsaKey* EcdsaKey::ImportKey(const AuthorizationSet& key_description, EVP_PKEY* pkey, |
| const Logger& logger, keymaster_error_t* error) { |
| if (!error) |
| return NULL; |
| *error = KM_ERROR_UNKNOWN_ERROR; |
| |
| UniquePtr<EC_KEY, ECDSA_Delete> ecdsa_key(EVP_PKEY_get1_EC_KEY(pkey)); |
| if (!ecdsa_key.get()) |
| return NULL; |
| |
| AuthorizationSet authorizations(key_description); |
| |
| size_t extracted_key_size_bits; |
| *error = get_group_size(*EC_KEY_get0_group(ecdsa_key.get()), &extracted_key_size_bits); |
| if (*error != KM_ERROR_OK) |
| return NULL; |
| |
| uint32_t key_size_bits; |
| if (authorizations.GetTagValue(TAG_KEY_SIZE, &key_size_bits)) { |
| // key_size_bits specified, make sure it matches the key. |
| if (key_size_bits != extracted_key_size_bits) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| } else { |
| // key_size_bits not specified, add it. |
| authorizations.push_back(TAG_KEY_SIZE, extracted_key_size_bits); |
| } |
| |
| keymaster_algorithm_t algorithm; |
| if (authorizations.GetTagValue(TAG_ALGORITHM, &algorithm)) { |
| if (algorithm != KM_ALGORITHM_ECDSA) { |
| *error = KM_ERROR_IMPORT_PARAMETER_MISMATCH; |
| return NULL; |
| } |
| } else { |
| authorizations.push_back(TAG_ALGORITHM, KM_ALGORITHM_ECDSA); |
| } |
| |
| // Don't bother with the other parameters. If the necessary padding, digest, purpose, etc. are |
| // missing, the error will be diagnosed when the key is used (when auth checking is |
| // implemented). |
| *error = KM_ERROR_OK; |
| return new EcdsaKey(ecdsa_key.release(), authorizations, logger); |
| } |
| |
| /* static */ |
| EC_GROUP* EcdsaKey::choose_group(size_t key_size_bits) { |
| switch (key_size_bits) { |
| case 192: |
| return EC_GROUP_new_by_curve_name(NID_X9_62_prime192v1); |
| break; |
| case 224: |
| return EC_GROUP_new_by_curve_name(NID_secp224r1); |
| break; |
| case 256: |
| return EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1); |
| break; |
| case 384: |
| return EC_GROUP_new_by_curve_name(NID_secp384r1); |
| break; |
| case 521: |
| return EC_GROUP_new_by_curve_name(NID_secp521r1); |
| break; |
| default: |
| return NULL; |
| break; |
| } |
| } |
| |
| /* static */ |
| keymaster_error_t EcdsaKey::get_group_size(const EC_GROUP& group, size_t* key_size_bits) { |
| switch (EC_GROUP_get_curve_name(&group)) { |
| case NID_X9_62_prime192v1: |
| *key_size_bits = 192; |
| break; |
| case NID_secp224r1: |
| *key_size_bits = 224; |
| break; |
| case NID_X9_62_prime256v1: |
| *key_size_bits = 256; |
| break; |
| case NID_secp384r1: |
| *key_size_bits = 384; |
| break; |
| case NID_secp521r1: |
| *key_size_bits = 521; |
| break; |
| default: |
| return KM_ERROR_UNSUPPORTED_EC_FIELD; |
| } |
| return KM_ERROR_OK; |
| } |
| |
| EcdsaKey::EcdsaKey(const KeyBlob& blob, const Logger& logger, keymaster_error_t* error) |
| : AsymmetricKey(blob, logger) { |
| if (error) |
| *error = LoadKey(blob); |
| } |
| |
| Operation* EcdsaKey::CreateOperation(keymaster_purpose_t purpose, keymaster_digest_t digest, |
| keymaster_padding_t padding, keymaster_error_t* error) { |
| Operation* op; |
| switch (purpose) { |
| case KM_PURPOSE_SIGN: |
| op = new EcdsaSignOperation(purpose, logger_, digest, padding, ecdsa_key_.release()); |
| break; |
| case KM_PURPOSE_VERIFY: |
| op = new EcdsaVerifyOperation(purpose, logger_, digest, padding, ecdsa_key_.release()); |
| break; |
| default: |
| *error = KM_ERROR_UNIMPLEMENTED; |
| return NULL; |
| } |
| *error = op ? KM_ERROR_OK : KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| return op; |
| } |
| |
| bool EcdsaKey::EvpToInternal(const EVP_PKEY* pkey) { |
| ecdsa_key_.reset(EVP_PKEY_get1_EC_KEY(const_cast<EVP_PKEY*>(pkey))); |
| return ecdsa_key_.get() != NULL; |
| } |
| |
| bool EcdsaKey::InternalToEvp(EVP_PKEY* pkey) const { |
| return EVP_PKEY_set1_EC_KEY(pkey, ecdsa_key_.get()) == 1; |
| } |
| |
| } // namespace keymaster |
