123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <new>
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#include <keymaster/android_keymaster_utils.h>
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namespace keymaster {
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// Keymaster never manages enormous buffers, so anything particularly large is bad data or the
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// result of a bug. We arbitrarily set a 16 MiB limit.
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const size_t kMaxDupBufferSize = 16 * 1024 * 1024;
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uint8_t* dup_buffer(const void* buf, size_t size) {
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if (size >= kMaxDupBufferSize) return nullptr;
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uint8_t* retval = new (std::nothrow) uint8_t[size];
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if (retval) memcpy(retval, buf, size);
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return retval;
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}
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int memcmp_s(const void* p1, const void* p2, size_t length) {
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const uint8_t* s1 = static_cast<const uint8_t*>(p1);
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const uint8_t* s2 = static_cast<const uint8_t*>(p2);
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uint8_t result = 0;
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for (; length > 0; length--)
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result |= *s1++ ^ *s2++;
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return result == 0 ? 0 : 1;
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}
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keymaster_error_t EllipticKeySizeToCurve(uint32_t key_size_bits, keymaster_ec_curve_t* curve) {
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switch (key_size_bits) {
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default:
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return KM_ERROR_UNSUPPORTED_KEY_SIZE;
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case 224:
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*curve = KM_EC_CURVE_P_224;
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break;
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case 256:
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// 256 bits could be P-256 or Curve25519
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return KM_ERROR_UNSUPPORTED_KEY_SIZE;
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case 384:
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*curve = KM_EC_CURVE_P_384;
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break;
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case 521:
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*curve = KM_EC_CURVE_P_521;
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break;
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}
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return KM_ERROR_OK;
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}
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keymaster_error_t EcKeySizeToCurve(uint32_t key_size_bits, keymaster_ec_curve_t* curve) {
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switch (key_size_bits) {
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default:
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return KM_ERROR_UNSUPPORTED_KEY_SIZE;
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case 224:
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*curve = KM_EC_CURVE_P_224;
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break;
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case 256:
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*curve = KM_EC_CURVE_P_256;
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break;
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case 384:
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*curve = KM_EC_CURVE_P_384;
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break;
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case 521:
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*curve = KM_EC_CURVE_P_521;
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break;
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}
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return KM_ERROR_OK;
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}
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keymaster_error_t EcCurveToKeySize(keymaster_ec_curve_t curve, uint32_t* key_size_bits) {
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switch (curve) {
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default:
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return KM_ERROR_UNSUPPORTED_EC_CURVE;
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case KM_EC_CURVE_P_224:
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*key_size_bits = 224;
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break;
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case KM_EC_CURVE_P_256:
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*key_size_bits = 256;
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break;
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case KM_EC_CURVE_P_384:
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*key_size_bits = 384;
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break;
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case KM_EC_CURVE_P_521:
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*key_size_bits = 521;
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break;
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case KM_EC_CURVE_CURVE_25519:
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*key_size_bits = 256;
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break;
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}
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return KM_ERROR_OK;
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}
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} // namespace keymaster
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