Iphone - 如何用公钥加密NSData并用私钥解密？ [英] Iphone - How to encrypt NSData with public key and decrypt with private key?
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问题描述
解决方案
我已经尝试过NSString的RSA加密和解密你可能会修改它，并使其工作在 NSData
将Security.Framework添加到项目包中。
ViewController.h代码如下：
#import <的UIKit / UIKit.h>
#import< Security / Security.h>
@interface ViewController：UIViewController
{
SecKeyRef publicKey;
SecKeyRef privateKey;
NSData * publicTag;
NSData * privateTag;
}
- （void）encryptWithPublicKey：（uint8_t *）plainBuffer cipherBuffer：（uint8_t *）cipherBuffer;
- （void）decryptWithPrivateKey：（uint8_t *）cipherBuffer plainBuffer：（uint8_t *）plainBuffer;
- （SecKeyRef）getPublicKeyRef;
- （SecKeyRef）getPrivateKeyRef;
- （void）testAsymmetricEncryptionAndDecryption;
- （void）generateKeyPair：（NSUInteger）keySize;
@end
ViewController.m文件代码如下：
#importViewController.h
const size_t BUFFER_SIZE = 64;
const size_t CIPHER_BUFFER_SIZE = 1024;
const uint32_t PADDING = kSecPaddingNone;
static const UInt8 publicKeyIdentifier [] =com.apple.sample.publickey;
static const UInt8 privateKeyIdentifier [] =com.apple.sample.privatekey;
@implementation ViewController
- （SecKeyRef）getPublicKeyRef {
OSStatus sanityCheck = noErr;
SecKeyRef publicKeyReference = NULL;
if（publicKeyReference == NULL）{
[self generateKeyPair：512];
NSMutableDictionary * queryPublicKey = [[NSMutableDictionary alloc] init];
//设置公钥查询字典。
[queryPublicKey setObject：（__ bridge id）kSecClassKey forKey：（__ bridge id）kSecClass];
[queryPublicKey setObject：publicTag forKey：（__ bridge id）kSecAttrApplicationTag];
[queryPublicKey setObject：（__ bridge id）kSecAttrKeyTypeRSA forKey：（__ bridge id）kSecAttrKeyType];
[queryPublicKey setObject：[NSNumber numberWithBool：YES] forKey：（__ bridge id）kSecReturnRef];
//获取密钥。
sanityCheck = SecItemCopyMatching（（__ bridge CFDictionaryRef）queryPublicKey，（CFTypeRef *）& publicKeyReference）;
if（sanityCheck！= noErr）
{
publicKeyReference = NULL;
}
// [queryPublicKey release];
} else {publicKeyReference = publicKey; }
return publicKeyReference; }
- （void）didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
//发布任何未使用的缓存数据，图像等。
}
- （void）testAsymmetricEncryptionAndDecryption {
uint8_t * plainBuffer;
uint8_t * cipherBuffer;
uint8_t * decryptptedBuffer;
const char inputString [] =如何使用公钥加密数据和使用私钥解密数据;
int len = strlen（inputString）;
// TODO：这是一个黑客，因为我知道inputString的长度将小于BUFFER_SIZE
if（len> BUFFER_SIZE）len = BUFFER_SIZE-1;
plainBuffer =（uint8_t *）calloc（BUFFER_SIZE，sizeof（uint8_t））;
cipherBuffer =（uint8_t *）calloc（CIPHER_BUFFER_SIZE，sizeof（uint8_t））;
decryptptedBuffer =（uint8_t *）calloc（BUFFER_SIZE，sizeof（uint8_t））;
strncpy（（char *）plainBuffer，inputString，len）;
NSLog（@init（）plainBuffer：％s，plainBuffer）;
// NSLog（@init（）：sizeof（plainBuffer）：％d，sizeof（plainBuffer））;
[self encryptWithPublicKey：（UInt8 *）plainBuffer cipherBuffer：cipherBuffer];
NSLog（@加密数据：％s，cipherBuffer）;
// NSLog（@init（）：sizeof（cipherBuffer）：％d，sizeof（cipherBuffer））;
[self decryptWithPrivateKey：cipherBuffer plainBuffer：decryptptedBuffer];
NSLog（@decryptpted data：％s，decryptptedBuffer）;
// NSLog（@init（）：sizeof（decryptptedBuffer）：％d，sizeof（decryptptedBuffer））;
NSLog（@====== / second test ============================= ==）;
free（plainBuffer）;
free（cipherBuffer）;
free（decryptptedBuffer）;
}
/ *借用：
* https://developer.apple.com/library/mac/#documentation/security/conceptual/CertKeyTrustProgGuide/iPhone_Tasks/iPhone_Tasks。 html
* /
- （void）encryptWithPublicKey：（uint8_t *）plainBuffer cipherBuffer：（uint8_t *）cipherBuffer
{
NSLog（@== encryptWithPublicKey ））;
OSStatus status = noErr;
NSLog（@**原始纯文本0：％s，plainBuffer）;
size_t plainBufferSize = strlen（（char *）plainBuffer）;
size_t cipherBufferSize = CIPHER_BUFFER_SIZE;
NSLog（@SecKeyGetBlockSize（）public =％lu，SecKeyGetBlockSize（[self getPublicKeyRef]））;
//处理错误
//使用public加密。
status = SecKeyEncrypt（[self getPublicKeyRef]，
PADDING，
plainBuffer，
plainBufferSize，
& cipherBuffer [0]，
& cipherBufferSize
）;
NSLog（@加密结果代码：％ld（size：％lu），status，cipherBufferSize）;
NSLog（@加密文本：％s，cipherBuffer）;
}
- （void）decryptWithPrivateKey：（uint8_t *）cipherBuffer plainBuffer：（uint8_t *）plainBuffer
{
OSStatus status = noErr;
size_t cipherBufferSize = strlen（（char *）cipherBuffer）;
NSLog（@decryptWithPrivateKey：缓冲区长度：％lu，BUFFER_SIZE）;
NSLog（@decryptWithPrivateKey：input of input：％lu，cipherBufferSize）;
// DECRYPTION
size_t plainBufferSize = BUFFER_SIZE;
//处理错误
status = SecKeyDecrypt（[self getPrivateKeyRef]，
PADDING，
& cipherBuffer [0]，
cipherBufferSize，
& plainBuffer [0]，
& plainBufferSize
）;
NSLog（@解密结果代码：％ld（size：％lu），status，plainBufferSize）;
NSLog（@FINAL decryptiled text：％s，plainBuffer）;
}
- （SecKeyRef）getPrivateKeyRef {
OSStatus resultCode = noErr;
SecKeyRef privateKeyReference = NULL;
// NSData * privateTag = [NSData dataWithBytes：@ABCDlength：strlen（（const char *）@ABCD）];
// if（privateKey == NULL）{
[self generateKeyPair：512];
NSMutableDictionary * queryPrivateKey = [[NSMutableDictionary alloc] init];
//设置私钥查询字典。
[queryPrivateKey setObject：（__ bridge id）kSecClassKey forKey：（__ bridge id）kSecClass];
[queryPrivateKey setObject：privateTag forKey：（__ bridge id）kSecAttrApplicationTag];
[queryPrivateKey setObject：（__ bridge id）kSecAttrKeyTypeRSA forKey：（__ bridge id）kSecAttrKeyType];
[queryPrivateKey setObject：[NSNumber numberWithBool：YES] forKey：（__ bridge id）kSecReturnRef];
//获取密钥。
resultCode = SecItemCopyMatching（（__ bridge CFDictionaryRef）queryPrivateKey，（CFTypeRef *）& privateKeyReference）;
NSLog（@getPrivateKey：result code：％ld，resultCode）;
if（resultCode！= noErr）
{
privateKeyReference = NULL;
}
// [queryPrivateKey release];
//} else {
// privateKeyReference = privateKey;
//}
return privateKeyReference;
}
#pragma mark - 查看生命周期
- （void）viewDidLoad
{
[super viewDidLoad];
//加载视图后，通常从笔尖进行任何其他设置。
}
- （void）viewDidUnload
{
[super viewDidUnload];
//发布主视图的任何保留的子视图。
//例如self.myOutlet = nil;
}
- （void）viewWillAppear：（BOOL）动画
{
[super viewWillAppear：animated];
privateTag = [[NSData alloc] initWithBytes：privateKeyIdentifier length：sizeof（privateKeyIdentifier）];
publicTag = [[NSData alloc] initWithBytes：publicKeyIdentifier length：sizeof（publicKeyIdentifier）];
[self testAsymmetricEncryptionAndDecryption];
}
- （void）viewDidAppear：（BOOL）动画
{
[super viewDidAppear：animated];
}
- （void）viewWillDisappear：（BOOL）动画
{
[super viewWillDisappear：animated];
}
- （void）viewDidDisappear：（BOOL）动画
{
[super viewDidDisappear：animated];
- （BOOL）shouldAutorotateToInterfaceOrientation :( UIInterfaceOrientation）interfaceOrientation
{
//为支持的方向返回YES
if（[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone）{
return（interfaceOrientation！= UIInterfaceOrientationPortraitUpsideDown）;
} else {
return YES;
}
}
- （void）generateKeyPair：（NSUInteger）keySize {
OSStatus sanityCheck = noErr;
publicKey = NULL;
privateKey = NULL;
// LOGGING_FACILITY1（keySize == 512 || keySize == 1024 || keySize == 2048，@％d是无效且不受支持的键大小，keySize）;
//首先删除当前密钥。
// [self deleteAsymmetricKeys];
//容器字典。
NSMutableDictionary * privateKeyAttr = [[NSMutableDictionary alloc] init];
NSMutableDictionary * publicKeyAttr = [[NSMutableDictionary alloc] init];
NSMutableDictionary * keyPairAttr = [[NSMutableDictionary alloc] init];
//设置关键字的顶级字典。
[keyPairAttr setObject：（__ bridge id）kSecAttrKeyTypeRSA forKey：（__ bridge id）kSecAttrKeyType];
[keyPairAttr setObject：[NSNumber numberWithUnsignedInteger：keySize] forKey：（__ bridge id）kSecAttrKeySizeInBits];
//设置私钥字典。
[privateKeyAttr setObject：[NSNumber numberWithBool：YES] forKey：（__ bridge id）kSecAttrIsPermanent];
[privateKeyAttr setObject：privateTag forKey：（__ bridge id）kSecAttrApplicationTag];
//请参阅SecKey.h设置其他标志值。
//设置公钥字典。
[publicKeyAttr setObject：[NSNumber numberWithBool：YES] forKey：（__ bridge id）kSecAttrIsPermanent];
[publicKeyAttr setObject：publicTag forKey：（__ bridge id）kSecAttrApplicationTag];
//请参阅SecKey.h设置其他标志值。
//将属性设置为顶级字典。
[keyPairAttr setObject：privateKeyAttr forKey：（__ bridge id）kSecPrivateKeyAttrs];
[keyPairAttr setObject：publicKeyAttr forKey：（__ bridge id）kSecPublicKeyAttrs];
// SecKeyGeneratePair仅用于教育目的返回SecKeyRefs。
sanityCheck = SecKeyGeneratePair（（__ bridge CFDictionaryRef）keyPairAttr，& publicKey和& privateKey）;
// LOGGING_FACILITY（sanityCheck == noErr&& publicKey！= NULL&&& publicKey！= NULL，@生成密钥对时真的很糟糕。
if（sanityCheck == noErr&& publicKey！= NULL&& privateKey！= NULL）
{
NSLog（@Successful）;
}
// [privateKeyAttr release];
// [publicKeyAttr release];
// [keyPairAttr release];
}
@end
让我知道你是否需要更多的帮助。
希望这有帮助。
I am converting a UIImage to NSData. Now I need to encrypt that NSData using a public key and I need to decrypt using a private key. Please provide a step by step procedure. Which algorithm do I need to use? Is there any good library for encryption and decryption? Also provide some code snippet for encryption and decryption.
解决方案
I have tried RSA Encryption and Decryption for NSString and you may well modify it and make it work for NSData
Add Security.Framework to your project bundle.
ViewController.h code is as follows:
#import <UIKit/UIKit.h>
#import <Security/Security.h>
@interface ViewController : UIViewController
{
SecKeyRef publicKey;
SecKeyRef privateKey;
NSData *publicTag;
NSData *privateTag;
}
- (void)encryptWithPublicKey:(uint8_t *)plainBuffer cipherBuffer:(uint8_t *)cipherBuffer;
- (void)decryptWithPrivateKey:(uint8_t *)cipherBuffer plainBuffer:(uint8_t *)plainBuffer;
- (SecKeyRef)getPublicKeyRef;
- (SecKeyRef)getPrivateKeyRef;
- (void)testAsymmetricEncryptionAndDecryption;
- (void)generateKeyPair:(NSUInteger)keySize;
@end
ViewController.m file code is as follows:
#import "ViewController.h"
const size_t BUFFER_SIZE = 64;
const size_t CIPHER_BUFFER_SIZE = 1024;
const uint32_t PADDING = kSecPaddingNone;
static const UInt8 publicKeyIdentifier[] = "com.apple.sample.publickey";
static const UInt8 privateKeyIdentifier[] = "com.apple.sample.privatekey";
@implementation ViewController
-(SecKeyRef)getPublicKeyRef {
OSStatus sanityCheck = noErr;
SecKeyRef publicKeyReference = NULL;
if (publicKeyReference == NULL) {
[self generateKeyPair:512];
NSMutableDictionary *queryPublicKey = [[NSMutableDictionary alloc] init];
// Set the public key query dictionary.
[queryPublicKey setObject:(__bridge id)kSecClassKey forKey:(__bridge id)kSecClass];
[queryPublicKey setObject:publicTag forKey:(__bridge id)kSecAttrApplicationTag];
[queryPublicKey setObject:(__bridge id)kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
[queryPublicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
// Get the key.
sanityCheck = SecItemCopyMatching((__bridge CFDictionaryRef)queryPublicKey, (CFTypeRef *)&publicKeyReference);
if (sanityCheck != noErr)
{
publicKeyReference = NULL;
}
// [queryPublicKey release];
} else { publicKeyReference = publicKey; }
return publicKeyReference; }
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)testAsymmetricEncryptionAndDecryption {
uint8_t *plainBuffer;
uint8_t *cipherBuffer;
uint8_t *decryptedBuffer;
const char inputString[] = "How to Encrypt data with public key and Decrypt data with private key";
int len = strlen(inputString);
// TODO: this is a hack since i know inputString length will be less than BUFFER_SIZE
if (len > BUFFER_SIZE) len = BUFFER_SIZE-1;
plainBuffer = (uint8_t *)calloc(BUFFER_SIZE, sizeof(uint8_t));
cipherBuffer = (uint8_t *)calloc(CIPHER_BUFFER_SIZE, sizeof(uint8_t));
decryptedBuffer = (uint8_t *)calloc(BUFFER_SIZE, sizeof(uint8_t));
strncpy( (char *)plainBuffer, inputString, len);
NSLog(@"init() plainBuffer: %s", plainBuffer);
//NSLog(@"init(): sizeof(plainBuffer): %d", sizeof(plainBuffer));
[self encryptWithPublicKey:(UInt8 *)plainBuffer cipherBuffer:cipherBuffer];
NSLog(@"encrypted data: %s", cipherBuffer);
//NSLog(@"init(): sizeof(cipherBuffer): %d", sizeof(cipherBuffer));
[self decryptWithPrivateKey:cipherBuffer plainBuffer:decryptedBuffer];
NSLog(@"decrypted data: %s", decryptedBuffer);
//NSLog(@"init(): sizeof(decryptedBuffer): %d", sizeof(decryptedBuffer));
NSLog(@"====== /second test =======================================");
free(plainBuffer);
free(cipherBuffer);
free(decryptedBuffer);
}
/* Borrowed from:
* https://developer.apple.com/library/mac/#documentation/security/conceptual/CertKeyTrustProgGuide/iPhone_Tasks/iPhone_Tasks.html
*/
- (void)encryptWithPublicKey:(uint8_t *)plainBuffer cipherBuffer:(uint8_t *)cipherBuffer
{
NSLog(@"== encryptWithPublicKey()");
OSStatus status = noErr;
NSLog(@"** original plain text 0: %s", plainBuffer);
size_t plainBufferSize = strlen((char *)plainBuffer);
size_t cipherBufferSize = CIPHER_BUFFER_SIZE;
NSLog(@"SecKeyGetBlockSize() public = %lu", SecKeyGetBlockSize([self getPublicKeyRef]));
// Error handling
// Encrypt using the public.
status = SecKeyEncrypt([self getPublicKeyRef],
PADDING,
plainBuffer,
plainBufferSize,
&cipherBuffer[0],
&cipherBufferSize
);
NSLog(@"encryption result code: %ld (size: %lu)", status, cipherBufferSize);
NSLog(@"encrypted text: %s", cipherBuffer);
}
- (void)decryptWithPrivateKey:(uint8_t *)cipherBuffer plainBuffer:(uint8_t *)plainBuffer
{
OSStatus status = noErr;
size_t cipherBufferSize = strlen((char *)cipherBuffer);
NSLog(@"decryptWithPrivateKey: length of buffer: %lu", BUFFER_SIZE);
NSLog(@"decryptWithPrivateKey: length of input: %lu", cipherBufferSize);
// DECRYPTION
size_t plainBufferSize = BUFFER_SIZE;
// Error handling
status = SecKeyDecrypt([self getPrivateKeyRef],
PADDING,
&cipherBuffer[0],
cipherBufferSize,
&plainBuffer[0],
&plainBufferSize
);
NSLog(@"decryption result code: %ld (size: %lu)", status, plainBufferSize);
NSLog(@"FINAL decrypted text: %s", plainBuffer);
}
- (SecKeyRef)getPrivateKeyRef {
OSStatus resultCode = noErr;
SecKeyRef privateKeyReference = NULL;
// NSData *privateTag = [NSData dataWithBytes:@"ABCD" length:strlen((const char *)@"ABCD")];
// if(privateKey == NULL) {
[self generateKeyPair:512];
NSMutableDictionary * queryPrivateKey = [[NSMutableDictionary alloc] init];
// Set the private key query dictionary.
[queryPrivateKey setObject:(__bridge id)kSecClassKey forKey:(__bridge id)kSecClass];
[queryPrivateKey setObject:privateTag forKey:(__bridge id)kSecAttrApplicationTag];
[queryPrivateKey setObject:(__bridge id)kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
[queryPrivateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
// Get the key.
resultCode = SecItemCopyMatching((__bridge CFDictionaryRef)queryPrivateKey, (CFTypeRef *)&privateKeyReference);
NSLog(@"getPrivateKey: result code: %ld", resultCode);
if(resultCode != noErr)
{
privateKeyReference = NULL;
}
// [queryPrivateKey release];
// } else {
// privateKeyReference = privateKey;
// }
return privateKeyReference;
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
privateTag = [[NSData alloc] initWithBytes:privateKeyIdentifier length:sizeof(privateKeyIdentifier)];
publicTag = [[NSData alloc] initWithBytes:publicKeyIdentifier length:sizeof(publicKeyIdentifier)];
[self testAsymmetricEncryptionAndDecryption];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
- (void)generateKeyPair:(NSUInteger)keySize {
OSStatus sanityCheck = noErr;
publicKey = NULL;
privateKey = NULL;
// LOGGING_FACILITY1( keySize == 512 || keySize == 1024 || keySize == 2048, @"%d is an invalid and unsupported key size.", keySize );
// First delete current keys.
// [self deleteAsymmetricKeys];
// Container dictionaries.
NSMutableDictionary * privateKeyAttr = [[NSMutableDictionary alloc] init];
NSMutableDictionary * publicKeyAttr = [[NSMutableDictionary alloc] init];
NSMutableDictionary * keyPairAttr = [[NSMutableDictionary alloc] init];
// Set top level dictionary for the keypair.
[keyPairAttr setObject:(__bridge id)kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
[keyPairAttr setObject:[NSNumber numberWithUnsignedInteger:keySize] forKey:(__bridge id)kSecAttrKeySizeInBits];
// Set the private key dictionary.
[privateKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecAttrIsPermanent];
[privateKeyAttr setObject:privateTag forKey:(__bridge id)kSecAttrApplicationTag];
// See SecKey.h to set other flag values.
// Set the public key dictionary.
[publicKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecAttrIsPermanent];
[publicKeyAttr setObject:publicTag forKey:(__bridge id)kSecAttrApplicationTag];
// See SecKey.h to set other flag values.
// Set attributes to top level dictionary.
[keyPairAttr setObject:privateKeyAttr forKey:(__bridge id)kSecPrivateKeyAttrs];
[keyPairAttr setObject:publicKeyAttr forKey:(__bridge id)kSecPublicKeyAttrs];
// SecKeyGeneratePair returns the SecKeyRefs just for educational purposes.
sanityCheck = SecKeyGeneratePair((__bridge CFDictionaryRef)keyPairAttr, &publicKey, &privateKey);
// LOGGING_FACILITY( sanityCheck == noErr && publicKey != NULL && privateKey != NULL, @"Something really bad went wrong with generating the key pair." );
if(sanityCheck == noErr && publicKey != NULL && privateKey != NULL)
{
NSLog(@"Successful");
}
// [privateKeyAttr release];
// [publicKeyAttr release];
// [keyPairAttr release];
}
@end
Let me know if you need more help.
Hope this helps.
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