Add libcrypto_utils.

#

# 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))

/*

 * 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;

}

/*

 * 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

#

# 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)

/*

 * 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)));

}