verdnatura-chat/ios/Pods/FirebaseInstanceID/Firebase/InstanceID/FIRInstanceIDKeyPairUtiliti...

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/*
* Copyright 2019 Google
*
* 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.
*/
#import "FIRInstanceIDKeyPairUtilities.h"
#import <CommonCrypto/CommonDigest.h>
#import "FIRInstanceIDKeyPair.h"
#import "FIRInstanceIDLogger.h"
#import "FIRInstanceIDStringEncoding.h"
NSString *FIRInstanceIDWebSafeBase64(NSData *data) {
// Websafe encoding with no padding.
FIRInstanceIDStringEncoding *encoding =
[FIRInstanceIDStringEncoding rfc4648Base64WebsafeStringEncoding];
[encoding setDoPad:NO];
return [encoding encode:data];
}
NSData *FIRInstanceIDSHA1(NSData *data) {
unsigned int outputLength = CC_SHA1_DIGEST_LENGTH;
unsigned char output[outputLength];
unsigned int length = (unsigned int)[data length];
CC_SHA1(data.bytes, length, output);
return [NSMutableData dataWithBytes:output length:outputLength];
}
NSDictionary *FIRInstanceIDKeyPairQuery(NSString *tag, BOOL addReturnAttr, BOOL returnData) {
NSMutableDictionary *queryKey = [NSMutableDictionary dictionary];
NSData *tagData = [tag dataUsingEncoding:NSUTF8StringEncoding];
queryKey[(__bridge id)kSecClass] = (__bridge id)kSecClassKey;
queryKey[(__bridge id)kSecAttrApplicationTag] = tagData;
queryKey[(__bridge id)kSecAttrKeyType] = (__bridge id)kSecAttrKeyTypeRSA;
if (addReturnAttr) {
if (returnData) {
queryKey[(__bridge id)kSecReturnData] = @(YES);
} else {
queryKey[(__bridge id)kSecReturnRef] = @(YES);
}
}
return queryKey;
}
NSString *FIRInstanceIDAppIdentity(FIRInstanceIDKeyPair *keyPair) {
// An Instance-ID is a 64 bit (8 byte) integer with a fixed 4-bit header of 0111 (=^ 0x7).
// The variable 60 bits are obtained by truncating the SHA1 of the app-instance's public key.
SecKeyRef publicKeyRef = [keyPair publicKey];
if (!publicKeyRef) {
FIRInstanceIDLoggerError(kFIRInstanceIDMessageCodeKeyPair002,
@"Unable to create a valid asymmetric crypto key");
return nil;
}
NSData *publicKeyData = keyPair.publicKeyData;
NSData *publicKeySHA1 = FIRInstanceIDSHA1(publicKeyData);
const uint8_t *bytes = publicKeySHA1.bytes;
NSMutableData *identityData = [NSMutableData dataWithData:publicKeySHA1];
uint8_t b0 = bytes[0];
// Take the first byte and make the initial four 7 by initially making the initial 4 bits 0
// and then adding 0x70 to it.
b0 = 0x70 + (0xF & b0);
// failsafe should give you back b0 itself
b0 = (b0 & 0xFF);
[identityData replaceBytesInRange:NSMakeRange(0, 1) withBytes:&b0];
NSData *data = [identityData subdataWithRange:NSMakeRange(0, 8 * sizeof(Byte))];
return FIRInstanceIDWebSafeBase64(data);
}