verifier.h

/*
 * Copyright (C) 2008 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 _RECOVERY_VERIFIER_H
#define _RECOVERY_VERIFIER_H

#include "mincrypt/p256.h"
#include "mincrypt/rsa.h"

#define ASSUMED_UPDATE_BINARY_NAME  "META-INF/com/google/android/update-binary"

enum { INSTALL_SUCCESS, INSTALL_ERROR, INSTALL_CORRUPT };

static const float VERIFICATION_PROGRESS_FRACTION = 0.25;

typedef struct {
    p256_int x;
    p256_int y;
} ECPublicKey;

typedef struct {
    typedef enum {
        RSA,
        EC,
    } KeyType;

    int hash_len;  // SHA_DIGEST_SIZE (SHA-1) or SHA256_DIGEST_SIZE (SHA-256)
    KeyType key_type;
    RSAPublicKey* rsa;
    ECPublicKey* ec;
} Certificate;

/* addr and length define a an update package file that has been
 * loaded (or mmap'ed, or whatever) into memory.  Verify that the file
 * is signed and the signature matches one of the given keys.  Return
 * one of the constants below.
 */
int verify_file(unsigned char* addr, size_t length);

Certificate* load_keys(const char* filename, int* numKeys);

#define VERIFY_SUCCESS        0
#define VERIFY_FAILURE        1

#endif  /* _RECOVERY_VERIFIER_H */