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SoftU2FToolObjCAppDelegate.m
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SoftU2FToolObjCAppDelegate.m
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//
// SoftU2FToolObjCAppDelegate.m
// SoftU2FToolObjC
//
// Created by bluebox on 18/10/28.
// Copyright 2018 __MyCompanyName__. All rights reserved.
//
#import "SoftU2FToolObjCAppDelegate.h"
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wobjc-protocol-method-implementation"
@implementation NSWindow (NSNotificationWindow)
- (void)center {
NSPoint pos;
pos.x = [[NSScreen mainScreen] visibleFrame].origin.x + [[NSScreen mainScreen] visibleFrame].size.width - [self frame].size.width;
pos.y = [[NSScreen mainScreen] visibleFrame].origin.y + [[NSScreen mainScreen] visibleFrame].size.height - [self frame].size.height;
pos.x -= 16;
pos.y -= 16;
[self setFrameOrigin : pos];
[self setLevel:NSScreenSaverWindowLevel];
}
@end
#pragma clang diagnostic pop
@implementation SoftU2FToolObjCAppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
// Insert code here to initialize your application
[self startU2FHID];
self.statusItem = [[NSStatusBar systemStatusBar] statusItemWithLength:NSVariableStatusItemLength];
self.statusItem.menu = self.statusMenu;
// self.statusItem.title = @"Y";
self.statusItem.highlightMode = YES;
self.statusItem.image = [NSImage imageNamed:@"fido-c"];
self.appIDs = @{
plain(@"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"):@"bogus",
sha256(@"https://u2f.bin.coffee"):@"u2f.bin.coffee",
sha256(@"https://alexander.sagen.me"):@"alexander.sagen.me",
sha256(@"https://github.com/u2f/trusted_facets"): @"github.com",
sha256(@"https://demo.yubico.com"): @"demo.yubico.com",
sha256(@"https://www.dropbox.com/u2f-app-id.json"): @"dropbox.com",
sha256(@"https://www.gstatic.com/securitykey/origins.json"): @"google.com",
sha256(@"https://vault.bitwarden.com/app-id.json"): @"vault.bitwarden.com",
sha256(@"https://keepersecurity.com"): @"keepersecurity.com",
sha256(@"https://api-9dcf9b83.duosecurity.com"): @"api-9dcf9b83.duosecurity.com",
sha256(@"https://dashboard.stripe.com"): @"dashboard.stripe.com",
sha256(@"https://id.fedoraproject.org/u2f-origins.json"): @"id.fedoraproject.org",
sha256(@"https://lastpass.com"): @"lastpass.com",
sha256(@"https://twitter.com/account/login_verification/u2f_trusted_facets.json"):@"twitter.com",
sha256(@"https://u2f.aws.amazon.com/app-id.json"):@"aws.amazon.com",
// WebAuthn rpID
sha256(@"webauthn.bin.coffee"):@"webauthn.bin.coffee",
sha256(@"demo.yubico.com"): @"demo.yubico.com",
sha256(@"webauthndemo.appspot.com"):@"webauthndemo.appspot.com",
};
}
- (void)applicationDidBecomeActive:(NSNotification *)notification {
// [NSApp hide:self];
}
- (id)init {
self = [super init];
self.enabled = YES;
return self;
}
- (IBAction) toggleEnabledAction:(id)sender {
self.enabled = !self.enabled;
if(self.enabled) {
[self startU2FHID];
self.statusItem.image = [NSImage imageNamed:@"fido-c"];
} else {
[self stopU2FHID];
self.statusItem.image = [NSImage imageNamed:@"fido-g"];
}
}
- (IBAction) quitAction:(id)sender {
[NSApp terminate:self];
}
- (void)applicationWillTerminate:(NSNotification *)notification {
[self stopU2FHID];
}
- (void)startU2FHID {
if(!u2fctx) {
u2fctx = softu2f_init(0);
// softu2f_hid_msg_handler_register(u2fctx, U2FHID_PING, handleMsgRequest);
softu2f_hid_msg_handler_register(u2fctx, U2FHID_MSG, handleMsgRequest);
// softu2f_hid_msg_handler_register(u2fctx, U2FHID_INIT, handleMsgRequest);
// softu2f_hid_msg_handler_register(u2fctx, U2FHID_WINK, handleWinkRequest);
[NSThread detachNewThreadSelector:@selector(runLoopThread) toTarget:self withObject:nil];
}
}
- (void)stopU2FHID {
if(u2fctx) {
softu2f_shutdown(u2fctx);
softu2f_deinit(u2fctx);
u2fctx = nil;
}
}
- (void) runLoopThread {
softu2f_run(u2fctx);
}
- (IBAction) approveButtonAction:(id)sender {
[[NSApplication sharedApplication] stopModalWithCode:1];
}
- (IBAction) rejectButtonAction:(id)sender {
[[NSApplication sharedApplication] stopModalWithCode:0];
}
- (void)timeoutModal {
[NSApp abortModal];
}
- (bool) testUserPresenseFor:(NSString*)msg {
NSTimer *timer = [NSTimer timerWithTimeInterval:10 target:self selector:@selector(timeoutModal) userInfo:nil repeats:NO];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSModalPanelRunLoopMode];
[self.usageLabel setStringValue:msg];
NSInteger res = [[NSApplication sharedApplication] runModalForWindow:self.popupWindow];
[timer invalidate];
[self.popupWindow orderOut:self];
if(res==NSRunAbortedResponse)
res = false;
return res;
}
NSData * signData(NSData *msg,EC_KEY *ec) {
EVP_MD_CTX *ctx=EVP_MD_CTX_new();
const unsigned char *cmsg = (const unsigned char *)[msg bytes];
unsigned char *sig;
unsigned int len; EVP_PKEY *pkey;
if (EC_KEY_check_key(ec) != 1) {
NSLog(@"error checking key\n");
EC_KEY_free(ec);
return nil;
}
pkey = EVP_PKEY_new();
if (pkey == NULL) {
NSLog(@"failed to init pkey\n");
EC_KEY_free(ec);
return nil;
}
if (EVP_PKEY_assign_EC_KEY(pkey, ec) != 1) {
NSLog(@"failed to assing ec to pkey\n");
EC_KEY_free(ec);
EVP_PKEY_free(pkey);
return nil;
}
// `ec` memory is managed by `pkey` from here.
if (EVP_SignInit(ctx, EVP_sha256()) != 1) {
NSLog(@"failed to init signing context\n");
EVP_PKEY_free(pkey);
return nil;
};
size_t msgLen = (unsigned int)[msg length];
if (EVP_SignUpdate(ctx, cmsg, msgLen) != 1) {
NSLog(@"failed to update digest\n");
EVP_PKEY_free(pkey);
return nil;
}
sig = (unsigned char *)malloc(EVP_PKEY_size(pkey));
if (sig == NULL) {
NSLog(@"failed to malloc for sig\n");
EVP_PKEY_free(pkey);
return nil;
}
if (EVP_SignFinal(ctx, sig, &len, pkey) != 1) {
NSLog(@"failed to finalize digest\n");
free(sig);
EVP_PKEY_free(pkey);
return nil;
}
NSData *res = [[NSData alloc] initWithBytes:sig length:len];
free(sig);
return res;
}
typedef enum {
CommandRegister = 1,
CommandAuthenticate,
CommandVersion,
} APUDInst;
typedef struct APDUBody {
union {
struct {
uint8_t challenge[32];
uint8_t application[32];
} registerRequest;
struct {
uint8_t challenge[32];
uint8_t application[32];
uint8_t keyHandleLen;
uint8_t keyHandle[256];
} authenticateRequest;
};
} APDUBody;
typedef struct APDUHeader {
char CLA;
char INS;
char P1;
char P2;
char Lc[3];
} APDUHeader;
typedef struct APDUPacket {
APDUHeader header;
APDUBody body;
} APDUPacket;
bool handleWinkRequest(softu2f_ctx *ctx, softu2f_hid_message *msg) {
NSLog(@"cmd:0x%x(U2FHID_WINK)",msg->cmd);
softu2f_hid_message res;
res.cid = msg->cid;
res.cmd = msg->cmd;
res.bcnt = msg->bcnt;
res.data = msg->data;
NSLog(@"send: ack");
softu2f_hid_msg_send(ctx, &res);
return true;
}
bool handleMsgRequest(softu2f_ctx *ctx, softu2f_hid_message *msg) {
NSLog(@"handleMsgRequest:cmd:0x%x(U2FHID_MSG)",msg->cmd);
NSLog(@"rcv: data(%u):%@", (unsigned int)CFDataGetLength(msg->data),msg->data);
softu2f_hid_message res;
res.cid = msg->cid;
res.cmd = U2FHID_MSG;
bool handled=false;
APUDInst inst = getAPDUInst(msg->data);
switch (inst) {
case CommandRegister:
handled = handleRegisterRequest(ctx,msg,&res);
break;
case CommandAuthenticate:
handled = handleAuthenticateRequest(ctx,msg,&res);
break;
case CommandVersion:
handled = handleVersionRequest(msg,&res);
break;
}
if(handled) {
NSLog(@"send: data(%u):%@", (unsigned int)CFDataGetLength(res.data), res.data );
softu2f_hid_msg_send(ctx, &res);
}
return handled;
}
APUDInst getAPDUInst(CFDataRef data) {
APDUPacket *apdu = (APDUPacket*)CFDataGetBytePtr(data);
return apdu->header.INS;
}
char responseNoErr[] = {0x90,0x00};
char responseConditionsNotStatisfied[] = {0x69,0x85};
char responseCmdNotAllowed[] = {0x69,0x86};
char responseWrongData[] = {0x6A,0x80};
char responseSomethingWrong[] = {0x6f,0x00};
NSString *sha256(NSString*str){
NSData *buf = [NSData dataWithBytes:[str cStringUsingEncoding:NSASCIIStringEncoding] length:[str length]];
uint8_t digest[SHA256_DIGEST_LENGTH];
SHA256(buf.bytes,buf.length, digest);
return [[NSData dataWithBytes:digest length:SHA256_DIGEST_LENGTH] description];
}
NSString *plain(NSString*str) {
NSData *buf = [NSData dataWithBytes:[str cStringUsingEncoding:NSASCIIStringEncoding] length:[str length]];
return [buf description];
}
NSString* getAppID(CFDataRef applicationParameter) {
NSString *applicationParameterStr = [(__bridge NSData*)applicationParameter description];
NSString *res = ((SoftU2FToolObjCAppDelegate*)[NSApp delegate]).appIDs[applicationParameterStr];
if(res==nil)
return @"unidentified site";
return res;
}
bool handleRegisterRequest(softu2f_ctx *ctx ,const softu2f_hid_message *msg, struct softu2f_hid_message *res) {
NSLog(@"handleRegisterRequest:%@", msg->data);
APDUPacket *apdu = (APDUPacket*)CFDataGetBytePtr(msg->data);
APDUBody body = apdu->body;
CFDataRef challenge = CFDataCreate(nil,body.registerRequest.challenge,sizeof(body.registerRequest.challenge));
CFDataRef application = CFDataCreate(nil,body.registerRequest.application,sizeof(body.registerRequest.application));
NSLog(@"challenge:%@",challenge);
NSLog(@"application:%@",application);
NSString *appID = getAppID(application);
if([appID isEqualToString:@"bogus"]) {
CFRelease(application);
CFRelease(challenge);
res->bcnt = sizeof(responseCmdNotAllowed);
res->data = CFDataCreate(NULL, responseCmdNotAllowed, res->bcnt);
return true;
}
__block BOOL approved = NO;
dispatch_sync(dispatch_get_main_queue(), ^{
approved = [(SoftU2FToolObjCAppDelegate*)[NSApp delegate] testUserPresenseFor:[NSString stringWithFormat:@"Registration Request from:\n %@",appID]];
});
if(!approved) {
CFRelease(application);
CFRelease(challenge);
res->bcnt = sizeof(responseCmdNotAllowed);
res->data = CFDataCreate(NULL, responseCmdNotAllowed, res->bcnt);
return true;
}
CFDataRef privKey, pubKey, keyHandle;
if(!generateKeyPair(application, &privKey, &pubKey, &keyHandle)) {
CFRelease(application);
CFRelease(challenge);
res->bcnt = sizeof(responseSomethingWrong);
res->data = CFDataCreate(NULL, responseSomethingWrong, res->bcnt);
return true;
}
CFRelease(application);
CFRelease(challenge);
char reserved[1] = {0x00};
size_t bufSize = 1+sizeof(body.registerRequest.application)+sizeof(body.registerRequest.challenge)+CFDataGetLength(keyHandle)+CFDataGetLength(pubKey);
CFMutableDataRef buf = CFDataCreateMutable(nil, bufSize);
CFDataAppendBytes(buf, reserved,sizeof(reserved));
CFDataAppendBytes(buf, body.registerRequest.application, sizeof(body.registerRequest.application));
CFDataAppendBytes(buf, body.registerRequest.challenge, sizeof(body.registerRequest.challenge));
CFDataAppendBytes(buf, CFDataGetBytePtr(keyHandle), CFDataGetLength(keyHandle));
CFDataAppendBytes(buf, CFDataGetBytePtr(pubKey), CFDataGetLength(pubKey));
CFDataRef signature = (__bridge_retained CFDataRef)[SelfSignedCertificate signData:(__bridge_transfer NSData*)buf];
char reservedResponse[1] = {0x05};
NSData *cert = [SelfSignedCertificate toDer];
uint8_t keyHandleSize = CFDataGetLength(keyHandle);
size_t responseSize = 1+CFDataGetLength(pubKey)+1+CFDataGetLength(keyHandle)+[cert length]+CFDataGetLength(signature)+sizeof(responseNoErr);
CFMutableDataRef response = CFDataCreateMutable(nil, responseSize);
CFDataAppendBytes(response,reservedResponse,1);
CFDataAppendBytes(response, CFDataGetBytePtr(pubKey), CFDataGetLength(pubKey));
CFDataAppendBytes(response,&keyHandleSize,1);
CFDataAppendBytes(response, CFDataGetBytePtr(keyHandle), CFDataGetLength(keyHandle));
CFDataAppendBytes(response,[cert bytes],[cert length]);
CFDataAppendBytes(response,CFDataGetBytePtr(signature),CFDataGetLength(signature));
CFRelease(signature);
CFRelease(pubKey);
CFRelease(privKey);
CFRelease(keyHandle);
CFDataAppendBytes(response,responseNoErr,sizeof(responseNoErr));
res->bcnt = CFDataGetLength(response);
res->data = response;
return true;
}
bool handleAuthenticateRequest(softu2f_ctx *ctx ,const softu2f_hid_message *msg, struct softu2f_hid_message *res) {
NSLog(@"handleAuthenticateRequest:%@", msg->data);
APDUPacket *apdu = (APDUPacket*)CFDataGetBytePtr(msg->data);
APDUBody body = apdu->body;
CFDataRef challenge = CFDataCreate(nil,body.registerRequest.challenge,sizeof(body.registerRequest.challenge));
CFDataRef application = CFDataCreate(nil,body.registerRequest.application,sizeof(body.registerRequest.application));
CFDataRef keyHandle = CFDataCreate(nil, body.authenticateRequest.keyHandle, body.authenticateRequest.keyHandleLen);
NSLog(@"challenge:%@",challenge);
NSLog(@"application:%@",application);
NSLog(@"keyhandle:%@",keyHandle);
CFDataRef rePrivKey;
if(!recoverFromKeyHandle(application, keyHandle, &rePrivKey)) {
CFRelease(keyHandle);
CFRelease(application);
CFRelease(challenge);
res->bcnt = sizeof(responseWrongData);
res->data = CFDataCreate(NULL, responseWrongData, res->bcnt);
return true;
}
CFRelease(keyHandle);
NSString *appID = getAppID(application);
__block BOOL approved = NO;
dispatch_sync(dispatch_get_main_queue(), ^{
approved = [(SoftU2FToolObjCAppDelegate*)[NSApp delegate] testUserPresenseFor:[NSString stringWithFormat:@"Authentication Request from:\n %@",appID]];
});
if(!approved) {
CFRelease(application);
CFRelease(challenge);
CFRelease(rePrivKey);
res->bcnt = sizeof(responseCmdNotAllowed);
res->data = CFDataCreate(NULL, responseCmdNotAllowed, res->bcnt);
return true;
}
CFRelease(application);
CFRelease(challenge);
char userPresence[1] = {0x01};
uint32_t counter[] = {htonl([[NSDate date] timeIntervalSince1970])};
size_t bufSize = sizeof(body.registerRequest.application)+sizeof(userPresence)+sizeof(counter)+sizeof(body.registerRequest.challenge);
CFMutableDataRef buf = CFDataCreateMutable(nil, bufSize);
CFDataAppendBytes(buf, body.registerRequest.application, sizeof(body.registerRequest.application));
CFDataAppendBytes(buf, userPresence, sizeof(userPresence));
CFDataAppendBytes(buf, (UInt8*)counter, sizeof(counter));
CFDataAppendBytes(buf, body.registerRequest.challenge, sizeof(body.registerRequest.challenge));
EC_KEY *eckey = recoverECKeyFromPrivatekey(rePrivKey);
CFRelease(rePrivKey);
CFDataRef signature = (__bridge_retained CFDataRef)signData((__bridge_transfer NSData*)buf,eckey);
size_t responseSize = 1+sizeof(counter)+CFDataGetLength(signature)+sizeof(responseNoErr);
CFMutableDataRef response = CFDataCreateMutable(nil, responseSize);
CFDataAppendBytes(response,userPresence,sizeof(userPresence));
CFDataAppendBytes(response, (UInt8*)counter,sizeof(counter));
CFDataAppendBytes(response,CFDataGetBytePtr(signature),CFDataGetLength(signature));
CFRelease(signature);
CFDataAppendBytes(response,responseNoErr,sizeof(responseNoErr));
res->bcnt = CFDataGetLength(response);
res->data = response;
return true;
}
bool handleVersionRequest(const softu2f_hid_message *msg, struct softu2f_hid_message *res) {
NSLog(@"handleVersionRequest");
char raw[] = {'U','2','F','_','V','2',0x90,0x00};
res->bcnt = sizeof(raw);
res->data = CFDataCreate(NULL, raw, res->bcnt);
return true;
}
uint8_t deviceSecret[] = {
<# define device key #>
};
#define NONCE_BYTES 16
CFDataRef generatePrivateKey(CFDataRef applicationParameter, uint8_t* nonceRandom) {
CFMutableDataRef buf = CFDataCreateMutable(nil, CFDataGetLength(applicationParameter)+NONCE_BYTES);
CFDataAppendBytes(buf, CFDataGetBytePtr(applicationParameter), CFDataGetLength(applicationParameter));
CFDataAppendBytes(buf, nonceRandom, NONCE_BYTES);
//HKDF(<#uint8_t *out_key#>, <#size_t out_len#>, <#const struct env_md_st *digest#>, <#const uint8_t *secret#>, <#size_t secret_len#>, <#const uint8_t *salt#>, <#size_t salt_len#>, <#const uint8_t *info#>, <#size_t info_len#>);
uint8_t hmacDigest[SHA512_DIGEST_LENGTH];
unsigned int hmacDigestLen;
HMAC(EVP_sha3_512(),deviceSecret,sizeof(deviceSecret),CFDataGetBytePtr(buf),CFDataGetLength(buf),hmacDigest,&hmacDigestLen);
CFRelease(buf);
uint8_t digest[SHA256_DIGEST_LENGTH];
unsigned int resultLen=SHA256_DIGEST_LENGTH;
// HMAC(EVP_sha3_256(),hmacDigest,hmacDigestLen,nonceRandom,NONCE_BYTES,digest,&resultLen);
PKCS5_PBKDF2_HMAC(hmacDigest, hmacDigestLen, nonceRandom, NONCE_BYTES, 16384, EVP_sha3_512(), SHA256_DIGEST_LENGTH, digest);
CFDataRef res = CFDataCreate(nil,digest,resultLen);
NSLog(@"generatePrivateKey:%@",res);
return res;
}
CFDataRef calculateKeyHandleMAC(CFDataRef applicationParameter, CFDataRef privKey, uint8_t *nonceRandom) {
CFMutableDataRef keyHandleMACBuf = CFDataCreateMutable(nil, CFDataGetLength(applicationParameter)+CFDataGetLength(privKey));
uint8_t keyHandleDigest[SHA512_DIGEST_LENGTH],resultDigest[SHA256_DIGEST_LENGTH];
unsigned int keyHandleDigestLen, resultLen;
CFDataAppendBytes(keyHandleMACBuf, CFDataGetBytePtr(applicationParameter), CFDataGetLength(applicationParameter));
CFDataAppendBytes(keyHandleMACBuf, CFDataGetBytePtr(privKey), CFDataGetLength(privKey));
HMAC(EVP_sha3_512(),deviceSecret,sizeof(deviceSecret),CFDataGetBytePtr(keyHandleMACBuf),CFDataGetLength(keyHandleMACBuf),keyHandleDigest,&keyHandleDigestLen);
HMAC(EVP_sha3_256(),keyHandleDigest,keyHandleDigestLen,nonceRandom,NONCE_BYTES,resultDigest,&resultLen);
CFRelease(keyHandleMACBuf);
CFDataRef res = CFDataCreate(nil,resultDigest,resultLen);
NSLog(@"calculateKeyHandleMAC:%@",res);
return res;
}
bool generateKeyPair(CFDataRef applicationParameter, CFDataRef *privKey, CFDataRef *pubKey, CFDataRef *keyHandle) {
uint8_t nonceRandom[NONCE_BYTES];
if(SecRandomCopyBytes(kSecRandomDefault, NONCE_BYTES, nonceRandom)!=errSecSuccess) {
NSLog(@"generateKeyPair: SecRandomCopyBytes failed");
return false;
}
CFDataRef newPrivateKey = generatePrivateKey(applicationParameter, nonceRandom);
EC_KEY *eckey = recoverECKeyFromPrivatekey(newPrivateKey);
EC_POINT *publicPoint;
const EC_GROUP *group = EC_KEY_get0_group(eckey);;
BN_CTX *ctx = BN_CTX_new();
uint8_t pointbuf[128];
size_t pointlen;
point_conversion_form_t form = EC_GROUP_get_point_conversion_form(group);
publicPoint = (EC_POINT*)EC_KEY_get0_public_key(eckey);
pointlen = EC_POINT_point2oct(group, publicPoint, form, pointbuf, 128, ctx);
CFDataRef publicKeyData = CFDataCreate(nil, pointbuf, pointlen);
BIGNUM *privateBN;
uint8_t privatebuf[128];
size_t privatelen;
privateBN = (BIGNUM*)EC_KEY_get0_private_key(eckey);
privatelen = BN_bn2mpi(privateBN, privatebuf);
CFDataRef privateKeyData = CFDataCreate(nil, privatebuf, privatelen);
CFDataRef keyHandleDigest = calculateKeyHandleMAC(applicationParameter, newPrivateKey, nonceRandom);
CFRelease(newPrivateKey);
CFMutableDataRef keyHandleBuf = CFDataCreateMutable(nil, sizeof(nonceRandom)+CFDataGetLength(keyHandleDigest));
CFDataAppendBytes(keyHandleBuf,nonceRandom,sizeof(nonceRandom));
CFDataAppendBytes(keyHandleBuf,CFDataGetBytePtr(keyHandleDigest),CFDataGetLength(keyHandleDigest));
CFRelease(keyHandleDigest);
*privKey = privateKeyData;
*pubKey = publicKeyData;
*keyHandle = keyHandleBuf;
return true;
}
EC_KEY* recoverECKeyFromPrivatekey(CFDataRef privateKeyData) {
BN_CTX *rectx=BN_CTX_new();
EC_KEY *reKey;
EC_GROUP *reGroup;
reKey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
reGroup = (EC_GROUP*)EC_KEY_get0_group(reKey);
BIGNUM *rePrivateBN;
rePrivateBN = BN_new();
BN_bin2bn(CFDataGetBytePtr(privateKeyData), (int)CFDataGetLength(privateKeyData), rePrivateBN);
EC_KEY_set_private_key(reKey, rePrivateBN);
EC_POINT *pub_key = NULL;
pub_key = EC_POINT_new(reGroup);
if (!EC_POINT_mul(reGroup, pub_key, rePrivateBN, NULL, NULL, rectx)) {
NSLog(@"recoverECKeyFromPrivatekey: EC_POINT_mul failed");
return nil;
}
EC_KEY_set_public_key(reKey, pub_key);
if(!EC_KEY_check_key(reKey))
return nil;
return reKey;
}
bool recoverFromKeyHandle(CFDataRef applicationParameter, CFDataRef keyHandle, CFDataRef *privateKeyData) {
uint8_t nonceRandom[NONCE_BYTES];
uint8_t macDigestBuf[SHA256_DIGEST_LENGTH];
if(CFDataGetLength(keyHandle)<(NONCE_BYTES+SHA256_DIGEST_LENGTH)) {
NSLog(@"recoverFromKeyHandle:keyHandle too short");
return false;
}
CFDataGetBytes(keyHandle, CFRangeMake(0, NONCE_BYTES), nonceRandom);
CFDataGetBytes(keyHandle, CFRangeMake(NONCE_BYTES, SHA256_DIGEST_LENGTH), macDigestBuf);
CFDataRef hmacDigestData = CFDataCreate(nil, macDigestBuf, SHA256_DIGEST_LENGTH);
CFDataRef privKey = generatePrivateKey(applicationParameter, nonceRandom);
CFDataRef calculatedHMACDigestData = calculateKeyHandleMAC(applicationParameter, privKey, nonceRandom);
if(! [(__bridge_transfer NSData*)hmacDigestData isEqualTo:(__bridge_transfer NSData*)calculatedHMACDigestData]) {
NSLog(@"recoverFromKeyHandle:wrong digest");
CFRelease(privKey);
return false;
}
EC_KEY *eckey = recoverECKeyFromPrivatekey(privKey);
if(eckey==nil) {
NSLog(@"recoverFromKeyHandle:wrong EC key");
CFRelease(privKey);
return false;
}
*privateKeyData = privKey;
return true;
}
@end