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Add libcrypto_utils.

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This provides a tiny library implementing encode/decode functionality
for Android's custom RSA public key binary format. Keys are encoded
from and decoded to BoringSSL RSA key objects.

Change-Id: I55e5522d557e0e9f35927a87b6581f020ee34e7a
This commit is contained in:
Mattias Nissler 2016-03-31 16:31:42 +02:00 committed by Elliott Hughes
parent 979ce0e338
commit b62146dcab
5 changed files with 437 additions and 0 deletions
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56
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#
# Copyright (C) 2016 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.
#
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libcrypto_utils
LOCAL_SRC_FILES := android_pubkey.c
LOCAL_CFLAGS := -Wall -Werror -Wextra -std=c99
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
LOCAL_SHARED_LIBRARIES := libcrypto
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libcrypto_utils
LOCAL_SRC_FILES := android_pubkey.c
LOCAL_CFLAGS := -Wall -Werror -Wextra -std=c99
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
LOCAL_SHARED_LIBRARIES := libcrypto-host
include $(BUILD_HOST_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libcrypto_utils_static
LOCAL_SRC_FILES := android_pubkey.c
LOCAL_CFLAGS := -Wall -Werror -Wextra -std=c99
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
LOCAL_STATIC_LIBRARIES := libcrypto_static
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libcrypto_utils_static
LOCAL_MODULE_HOST_OS := darwin linux windows
LOCAL_SRC_FILES := android_pubkey.c
LOCAL_CFLAGS := -Wall -Werror -Wextra -std=c99
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
LOCAL_STATIC_LIBRARIES := libcrypto_static
include $(BUILD_HOST_STATIC_LIBRARY)
include $(call all-makefiles-under,$(LOCAL_PATH))

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/*
* Copyright (C) 2016 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 <crypto_utils/android_pubkey.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
// Better safe than sorry.
#if (ANDROID_PUBKEY_MODULUS_SIZE % 4) != 0
#error RSA modulus size must be multiple of the word size!
#endif
// Size of the RSA modulus in words.
#define ANDROID_PUBKEY_MODULUS_SIZE_WORDS (ANDROID_PUBKEY_MODULUS_SIZE / 4)
// This file implements encoding and decoding logic for Android's custom RSA
// public key binary format. Public keys are stored as a sequence of
// little-endian 32 bit words. Note that Android only supports little-endian
// processors, so we don't do any byte order conversions when parsing the binary
// struct.
typedef struct RSAPublicKey {
// Modulus length. This must be ANDROID_PUBKEY_MODULUS_SIZE.
uint32_t modulus_size_words;
// Precomputed montgomery parameter: -1 / n[0] mod 2^32
uint32_t n0inv;
// RSA modulus as a little-endian array.
uint8_t modulus[ANDROID_PUBKEY_MODULUS_SIZE];
// Montgomery parameter R^2 as a little-endian array of little-endian words.
uint8_t rr[ANDROID_PUBKEY_MODULUS_SIZE];
// RSA modulus: 3 or 65537
uint32_t exponent;
} RSAPublicKey;
// Reverses byte order in |buffer|.
static void reverse_bytes(uint8_t* buffer, size_t size) {
for (size_t i = 0; i < (size + 1) / 2; ++i) {
uint8_t tmp = buffer[i];
buffer[i] = buffer[size - i - 1];
buffer[size - i - 1] = tmp;
}
}
bool android_pubkey_decode(const uint8_t* key_buffer, size_t size, RSA** key) {
const RSAPublicKey* key_struct = (RSAPublicKey*)key_buffer;
bool ret = false;
uint8_t modulus_buffer[ANDROID_PUBKEY_MODULUS_SIZE];
RSA* new_key = RSA_new();
if (!new_key) {
goto cleanup;
}
// Check |size| is large enough and the modulus size is correct.
if (size < sizeof(RSAPublicKey)) {
goto cleanup;
}
if (key_struct->modulus_size_words != ANDROID_PUBKEY_MODULUS_SIZE_WORDS) {
goto cleanup;
}
// Convert the modulus to big-endian byte order as expected by BN_bin2bn.
memcpy(modulus_buffer, key_struct->modulus, sizeof(modulus_buffer));
reverse_bytes(modulus_buffer, sizeof(modulus_buffer));
new_key->n = BN_bin2bn(modulus_buffer, sizeof(modulus_buffer), NULL);
if (!new_key->n) {
goto cleanup;
}
// Read the exponent.
new_key->e = BN_new();
if (!new_key->e || !BN_set_word(new_key->e, key_struct->exponent)) {
goto cleanup;
}
// Note that we don't extract the montgomery parameters n0inv and rr from
// the RSAPublicKey structure. They assume a word size of 32 bits, but
// BoringSSL may use a word size of 64 bits internally, so we're lacking the
// top 32 bits of n0inv in general. For now, we just ignore the parameters
// and have BoringSSL recompute them internally. More sophisticated logic can
// be added here if/when we want the additional speedup from using the
// pre-computed montgomery parameters.
*key = new_key;
ret = true;
cleanup:
if (!ret && new_key) {
RSA_free(new_key);
}
return ret;
}
static bool android_pubkey_encode_bignum(const BIGNUM* num, uint8_t* buffer) {
if (!BN_bn2bin_padded(buffer, ANDROID_PUBKEY_MODULUS_SIZE, num)) {
return false;
}
reverse_bytes(buffer, ANDROID_PUBKEY_MODULUS_SIZE);
return true;
}
bool android_pubkey_encode(const RSA* key, uint8_t* key_buffer, size_t size) {
RSAPublicKey* key_struct = (RSAPublicKey*)key_buffer;
bool ret = false;
BN_CTX* ctx = BN_CTX_new();
BIGNUM* r32 = BN_new();
BIGNUM* n0inv = BN_new();
BIGNUM* rr = BN_new();
if (sizeof(RSAPublicKey) > size ||
RSA_size(key) != ANDROID_PUBKEY_MODULUS_SIZE) {
goto cleanup;
}
// Store the modulus size.
key_struct->modulus_size_words = ANDROID_PUBKEY_MODULUS_SIZE_WORDS;
// Compute and store n0inv = -1 / N[0] mod 2^32.
if (!ctx || !r32 || !n0inv || !BN_set_bit(r32, 32) ||
!BN_mod(n0inv, key->n, r32, ctx) ||
!BN_mod_inverse(n0inv, n0inv, r32, ctx) || !BN_sub(n0inv, r32, n0inv)) {
goto cleanup;
}
key_struct->n0inv = (uint32_t)BN_get_word(n0inv);
// Store the modulus.
if (!android_pubkey_encode_bignum(key->n, key_struct->modulus)) {
goto cleanup;
}
// Compute and store rr = (2^(rsa_size)) ^ 2 mod N.
if (!ctx || !rr || !BN_set_bit(rr, ANDROID_PUBKEY_MODULUS_SIZE * 8) ||
!BN_mod_sqr(rr, rr, key->n, ctx) ||
!android_pubkey_encode_bignum(rr, key_struct->rr)) {
goto cleanup;
}
// Store the exponent.
key_struct->exponent = (uint32_t)BN_get_word(key->e);
ret = true;
cleanup:
BN_free(rr);
BN_free(n0inv);
BN_free(r32);
BN_CTX_free(ctx);
return ret;
}

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/*
* Copyright (C) 2016 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.
*/
#ifndef CRYPTO_UTILS_ANDROID_PUBKEY_H
#define CRYPTO_UTILS_ANDROID_PUBKEY_H
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <openssl/rsa.h>
#ifdef __cplusplus
extern "C" {
#endif
// Size of an RSA modulus such as an encrypted block or a signature.
#define ANDROID_PUBKEY_MODULUS_SIZE (2048 / 8)
// Size of an encoded RSA key.
#define ANDROID_PUBKEY_ENCODED_SIZE \
(3 * sizeof(uint32_t) + 2 * ANDROID_PUBKEY_MODULUS_SIZE)
/* Allocates a new RSA |key| object, decodes a public RSA key stored in
* Android's custom binary format from |key_buffer| and sets the key parameters
* in |key|. |size| specifies the size of the key buffer and must be at least
* |ANDROID_PUBKEY_ENCODED_SIZE|. The resulting |*key| can be used with the
* standard BoringSSL API to perform public operations.
*
* Returns true if successful, in which case the caller receives ownership of
* the |*key| object, i.e. needs to call RSA_free() when done with it. If there
* is an error, |key| is left untouched and the return value will be false.
*/
bool android_pubkey_decode(const uint8_t* key_buffer, size_t size, RSA** key);
/* Encodes |key| in the Android RSA public key binary format and stores the
* bytes in |key_buffer|. |key_buffer| should be of size at least
* |ANDROID_PUBKEY_ENCODED_SIZE|.
*
* Returns true if successful, false on error.
*/
bool android_pubkey_encode(const RSA* key, uint8_t* key_buffer, size_t size);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // CRYPTO_UTILS_ANDROID_PUBKEY_H

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#
# Copyright (C) 2016 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.
#
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libcrypto_utils_test
LOCAL_SRC_FILES := android_pubkey_test.cpp
LOCAL_CFLAGS := -Wall -Werror -Wextra -std=c++11
LOCAL_SHARED_LIBRARIES := libcrypto_utils libcrypto-host
include $(BUILD_HOST_NATIVE_TEST)

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/*
* Copyright (C) 2016 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 <crypto_utils/android_pubkey.h>
#include <string.h>
#include <memory>
#include <openssl/obj_mac.h>
#include <openssl/rsa.h>
#include <gtest/gtest.h>
// Test digest to verify.
const uint8_t kDigest[] = {
0x31, 0x5f, 0x5b, 0xdb, 0x76, 0xd0, 0x78, 0xc4, 0x3b, 0x8a, 0xc0,
0x06, 0x4e, 0x4a, 0x01, 0x64, 0x61, 0x2b, 0x1f, 0xce, 0x77, 0xc8,
0x69, 0x34, 0x5b, 0xfc, 0x94, 0xc7, 0x58, 0x94, 0xed, 0xd3,
};
// 2048 RSA test key.
const uint8_t kKey2048[ANDROID_PUBKEY_ENCODED_SIZE] = {
0x40, 0x00, 0x00, 0x00, 0x05, 0x75, 0x61, 0xd1, 0x33, 0xf0, 0x2d, 0x12,
0x45, 0xfb, 0xae, 0x07, 0x02, 0x15, 0x4f, 0x3a, 0x2b, 0xa3, 0xbc, 0x49,
0xbd, 0x14, 0x07, 0xa0, 0xc0, 0x9f, 0x0c, 0x52, 0x60, 0x77, 0x9f, 0xa2,
0x31, 0xd0, 0xa7, 0xfb, 0x7e, 0xde, 0xfb, 0xc9, 0x05, 0xc0, 0x97, 0xf7,
0x74, 0x99, 0xe6, 0xd1, 0x08, 0xa6, 0xc2, 0x59, 0x5a, 0xd8, 0x37, 0x1d,
0xe0, 0x48, 0x5e, 0x63, 0x44, 0x04, 0x8b, 0x05, 0x20, 0xf6, 0x25, 0x67,
0x38, 0xb2, 0xb6, 0xf9, 0xbe, 0xb6, 0x1d, 0x7f, 0x1b, 0x71, 0x8a, 0xeb,
0xb7, 0xf8, 0x01, 0xc1, 0x5e, 0xf7, 0xfe, 0x48, 0x08, 0x27, 0x0f, 0x27,
0x2a, 0x64, 0x1a, 0x43, 0x8d, 0xcf, 0x5a, 0x33, 0x5c, 0x18, 0xc5, 0xf4,
0xe7, 0xfe, 0xee, 0xd3, 0x12, 0x62, 0xad, 0x61, 0x78, 0x9a, 0x03, 0xb0,
0xaf, 0xab, 0x91, 0x57, 0x46, 0xbf, 0x18, 0xc6, 0xbc, 0x0c, 0x6b, 0x55,
0xcd, 0xda, 0xc4, 0xcc, 0x98, 0x46, 0x91, 0x99, 0xbc, 0xa3, 0xca, 0x6c,
0x86, 0xa6, 0x1c, 0x8f, 0xca, 0xf8, 0xf6, 0x8a, 0x00, 0x8e, 0x05, 0xd7,
0x13, 0x43, 0xe2, 0xf2, 0x1a, 0x13, 0xf3, 0x50, 0x13, 0xa4, 0xf2, 0x4e,
0x41, 0xb1, 0x36, 0x78, 0x55, 0x4c, 0x5e, 0x27, 0xc5, 0xc0, 0x4b, 0xd8,
0x93, 0xaa, 0x7e, 0xf0, 0x90, 0x08, 0x10, 0x26, 0x72, 0x6d, 0xb9, 0x21,
0xae, 0x4d, 0x01, 0x4b, 0x55, 0x1d, 0xe7, 0x1e, 0x5e, 0x31, 0x6e, 0x62,
0xd1, 0x33, 0x26, 0xcb, 0xdb, 0xfe, 0x72, 0x98, 0xc8, 0x06, 0x1c, 0x12,
0xdf, 0xfc, 0x74, 0xe5, 0x7a, 0x6f, 0xf5, 0xa3, 0x63, 0x08, 0xe3, 0x02,
0x68, 0x4d, 0x7c, 0x70, 0x05, 0xec, 0x95, 0x7e, 0x24, 0xa4, 0xbc, 0x4c,
0xcd, 0x39, 0x14, 0xb5, 0x2a, 0x8f, 0xc1, 0xe3, 0x4e, 0xfa, 0xf8, 0x70,
0x50, 0x8f, 0xd5, 0x8e, 0xc7, 0xb5, 0x32, 0x89, 0x4d, 0xbb, 0x6a, 0xc1,
0xc1, 0xa2, 0x42, 0x57, 0x57, 0xbd, 0x2a, 0xdc, 0xa6, 0xfd, 0xc8, 0x86,
0x44, 0x6a, 0x03, 0x5d, 0x4d, 0x28, 0xe1, 0xde, 0xb4, 0xa9, 0xa5, 0x03,
0x61, 0x7a, 0x5f, 0xb1, 0x09, 0x17, 0x2b, 0x9c, 0xa2, 0x54, 0x28, 0xad,
0x34, 0xc9, 0x5f, 0x6c, 0x9f, 0xb8, 0xd2, 0xa9, 0x78, 0xa7, 0xaa, 0xb3,
0x11, 0x2f, 0x65, 0x9b, 0x4e, 0x67, 0x0c, 0xcc, 0x20, 0x36, 0xbf, 0x26,
0x2b, 0x4e, 0xc0, 0xd4, 0xbd, 0x22, 0x64, 0xc4, 0x1c, 0x56, 0x69, 0xdb,
0x5f, 0x89, 0xe1, 0x75, 0x68, 0x8d, 0x0e, 0xab, 0x1c, 0x10, 0x1a, 0xc0,
0x12, 0x5d, 0x6f, 0xbd, 0x09, 0xbb, 0x47, 0xcb, 0xe7, 0x34, 0xef, 0x56,
0xab, 0xea, 0xc3, 0xe9, 0x7f, 0x9a, 0x3d, 0xe9, 0x2d, 0x14, 0x61, 0x25,
0x37, 0x5c, 0x3b, 0x4b, 0xaf, 0x5a, 0x4b, 0xc8, 0x99, 0x1a, 0x32, 0x8f,
0x54, 0x07, 0xd3, 0x57, 0x8a, 0x3d, 0x2a, 0xf7, 0x9e, 0x7e, 0x92, 0x2a,
0x50, 0xe9, 0xd8, 0xdb, 0xd6, 0x03, 0xd3, 0x8e, 0x54, 0x32, 0xce, 0x87,
0x93, 0x92, 0xe7, 0x75, 0xe1, 0x6b, 0x78, 0x1a, 0x85, 0xc2, 0x46, 0xa1,
0x31, 0xbb, 0xc7, 0xb9, 0x1d, 0xd1, 0x71, 0xe0, 0xe2, 0x9b, 0x9c, 0x0d,
0xa3, 0xcf, 0x93, 0x4d, 0x87, 0x7b, 0x65, 0xd9, 0xda, 0x4c, 0xd9, 0x6a,
0xa6, 0x36, 0xc2, 0xc7, 0xe3, 0x33, 0xe2, 0xc3, 0x83, 0xd1, 0x72, 0x54,
0x30, 0x81, 0x5e, 0x34, 0x2c, 0x61, 0xee, 0xf4, 0x48, 0x97, 0xb6, 0xaa,
0x47, 0x6a, 0x05, 0x09, 0xd8, 0x4d, 0x90, 0xaf, 0xa8, 0x4e, 0x82, 0xe4,
0x8e, 0xb5, 0xe2, 0x65, 0x86, 0x67, 0xe9, 0x5b, 0x4b, 0x9a, 0x68, 0x08,
0x30, 0xf6, 0x25, 0x8b, 0x20, 0xda, 0x26, 0x6f, 0xbd, 0x0d, 0xa5, 0xd8,
0x6a, 0x7b, 0x01, 0x2f, 0xab, 0x7b, 0xb5, 0xfe, 0x62, 0x37, 0x2d, 0x94,
0x43, 0x2f, 0x4d, 0x16, 0x01, 0x00, 0x01, 0x00,
};
// 2048 bit RSA signature.
const uint8_t kSignature2048[ANDROID_PUBKEY_MODULUS_SIZE] = {
0x3a, 0x11, 0x84, 0x40, 0xc1, 0x2f, 0x13, 0x8c, 0xde, 0xb0, 0xc3, 0x89,
0x8a, 0x63, 0xb2, 0x50, 0x93, 0x58, 0xc0, 0x0c, 0xb7, 0x08, 0xe7, 0x6c,
0x52, 0x87, 0x4e, 0x78, 0x89, 0xa3, 0x9a, 0x47, 0xeb, 0x11, 0x57, 0xbc,
0xb3, 0x97, 0xf8, 0x34, 0xf1, 0xf7, 0xbf, 0x3a, 0xfa, 0x1c, 0x6b, 0xdc,
0xd1, 0x02, 0xde, 0x9a, 0x0d, 0x72, 0xe7, 0x19, 0x63, 0x81, 0x46, 0x68,
0x1e, 0x63, 0x64, 0xc6, 0x59, 0xe7, 0x7c, 0x39, 0xed, 0x32, 0xd2, 0xd1,
0xd5, 0x1f, 0x13, 0x9b, 0x52, 0xdf, 0x34, 0xa3, 0xc0, 0xc4, 0x9a, 0x63,
0x9b, 0x9c, 0xbe, 0x22, 0xc8, 0xd8, 0x14, 0x2f, 0x4c, 0x78, 0x36, 0xdb,
0x16, 0x41, 0x67, 0xc1, 0x21, 0x8a, 0x73, 0xb2, 0xe5, 0xb0, 0xd3, 0x80,
0x91, 0x7a, 0xbf, 0xf9, 0x59, 0x4a, 0x4d, 0x78, 0x45, 0x44, 0xa1, 0x52,
0x86, 0x29, 0x48, 0x4d, 0xf0, 0x5d, 0xf2, 0x55, 0xa7, 0xcd, 0xc5, 0x2b,
0x7b, 0xe0, 0xb1, 0xf6, 0x2a, 0xd5, 0x61, 0xba, 0x1e, 0x1e, 0x3a, 0xf0,
0x55, 0xbc, 0x8c, 0x44, 0x41, 0xfc, 0xb8, 0x8c, 0x76, 0xbf, 0x80, 0x58,
0x82, 0x35, 0x4b, 0x0c, 0xfd, 0xef, 0xd5, 0x70, 0xd1, 0x64, 0xcb, 0x46,
0x58, 0x37, 0xbc, 0xa9, 0x7d, 0xd4, 0x70, 0xac, 0xce, 0xec, 0xca, 0x48,
0xcb, 0x0a, 0x40, 0x77, 0x04, 0x59, 0xca, 0x9c, 0x7d, 0x1a, 0x0b, 0xf0,
0xb5, 0xdd, 0xde, 0x71, 0x18, 0xb8, 0xef, 0x90, 0x2a, 0x09, 0x42, 0x39,
0x74, 0xff, 0x45, 0xa1, 0x39, 0x17, 0x50, 0x89, 0xa6, 0x5f, 0xbc, 0x9c,
0x0c, 0x9b, 0x47, 0x25, 0x79, 0x3e, 0xe3, 0xaa, 0xaf, 0xbe, 0x73, 0x6b,
0xcb, 0xe7, 0x35, 0xc1, 0x27, 0x09, 0xcd, 0xeb, 0xd7, 0xcf, 0x63, 0x83,
0x64, 0x8c, 0x45, 0x1c, 0x1d, 0x58, 0xcc, 0xd2, 0xf8, 0x2b, 0x4c, 0x4e,
0x14, 0x89, 0x2d, 0x70,
};
struct AndroidPubkeyTest : public ::testing::Test {
void SetUp() override {
RSA* new_key = nullptr;
ASSERT_TRUE(android_pubkey_decode(kKey2048, sizeof(kKey2048), &new_key));
key_.reset(new_key);
}
std::unique_ptr<RSA, void(*)(RSA*)> key_ = {nullptr, RSA_free};
};
TEST_F(AndroidPubkeyTest, Decode) {
// Make sure the decoded key successfully verifies a valid signature.
EXPECT_TRUE(RSA_verify(NID_sha256, kDigest, sizeof(kDigest), kSignature2048,
sizeof(kSignature2048), key_.get()));
}
TEST_F(AndroidPubkeyTest, Encode) {
uint8_t key_data[ANDROID_PUBKEY_ENCODED_SIZE];
ASSERT_TRUE(android_pubkey_encode(key_.get(), key_data, sizeof(key_data)));
ASSERT_EQ(0, memcmp(kKey2048, key_data, sizeof(kKey2048)));
}