在iOS中使用RSA加密解密，需要用到.der和.p12后缀格式的文件，其中.der格式的文件存放的是公钥（Public key）用于加密，.p12格式的文件存放的是私钥（Private key）用于解密. 首先需要先生成这些文件，然后再将文件导入工程使用，不多说，开始做！

一、使用openssl生成所需秘钥文件

生成环境是在mac系统下，使用openssl进行生成，首先打开终端，按下面这些步骤依次来做：

1. 生成模长为1024bit的私钥文件private_key.pem

openssl genrsa -out private_key.pem 1024

2. 生成证书请求文件rsaCertReq.csr

openssl req -new -key private_key.pem -out rsaCerReq.csr
注意：这一步会提示输入国家、省份、mail等信息，可以根据实际情况填写，或者全部不用填写，直接全部敲回车.

3. 生成证书rsaCert.crt，并设置有效时间为1年

openssl x509 -req -days 3650 -in rsaCerReq.csr -signkey private_key.pem -out rsaCert.crt

4. 生成供iOS使用的公钥文件public_key.der

openssl x509 -outform der -in rsaCert.crt -out public_key.der

5. 生成供iOS使用的私钥文件private_key.p12

openssl pkcs12 -export -out private_key.p12 -inkey private_key.pem -in rsaCert.crt
注意：这一步会提示给私钥文件设置密码，直接输入想要设置密码即可，然后敲回车，然后再验证刚才设置的密码，再次输入密码，然后敲回车，完毕！
在解密时，private_key.p12文件需要和这里设置的密码配合使用，因此需要牢记此密码.

6. 生成供Java使用的公钥rsa_public_key.pem

openssl rsa -in private_key.pem -out rsa_public_key.pem -pubout

7. 生成供Java使用的私钥pkcs8_private_key.pem

openssl pkcs8 -topk8 -in private_key.pem -out pkcs8_private_key.pem -nocrypt
全部执行成功后，会生成如下文件，其中public_key.der和private_key.p12就是iOS需要用到的文件，如下图：

生成的文件
二、将文件导入工程使用

1.新建工程, 并导入Security.framework框架, 如下图:

新建工程并添加框架
2.导入秘钥文件

导入.der和.p12格式的秘钥文件, 如下图:

导入秘钥文件
3.新建用于加密、解密的类RSAEncryptor, 并实现相关方法

新建RSAEncryptor类, 如下图:

新建用于加密解密的类
下面开始上代码, 可以直接复制过去用:
RSAEncryptor.h代码如下:

import <Foundation/Foundation.h>

@interface RSAEncryptor : NSObject

/**

• 加密方法
• @param str 需要加密的字符串
• @param path '.der'格式的公钥文件路径
  */

• (NSString *)encryptString:(NSString *)str publicKeyWithContentsOfFile:(NSString *)path;

/**

• 解密方法
• @param str 需要解密的字符串
• @param path '.p12'格式的私钥文件路径
• @param password 私钥文件密码
  */

• (NSString *)decryptString:(NSString *)str privateKeyWithContentsOfFile:(NSString *)path password:(NSString *)password;

/**

• 加密方法
• @param str 需要加密的字符串
• @param pubKey 公钥字符串
  */

• (NSString *)encryptString:(NSString *)str publicKey:(NSString *)pubKey;

/**

• 解密方法
• @param str 需要解密的字符串
• @param privKey 私钥字符串
  */

• (NSString *)decryptString:(NSString *)str privateKey:(NSString *)privKey;

@end
RSAEncryptor.m代码如下:

import "RSAEncryptor.h"

import <Security/Security.h>

@implementation RSAEncryptor

static NSString *base64_encode_data(NSData *data){
data = [data base64EncodedDataWithOptions:0];
NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return ret;
}

static NSData *base64_decode(NSString *str){
NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
return data;
}

pragma mark - 使用'.der'公钥文件加密

//加密

• (NSString *)encryptString:(NSString *)str publicKeyWithContentsOfFile:(NSString *)path{
  if (!str || !path) return nil;
  return [self encryptString:str publicKeyRef:[self getPublicKeyRefWithContentsOfFile:path]];
  }

//获取公钥

• (SecKeyRef)getPublicKeyRefWithContentsOfFile:(NSString *)filePath{
  NSData *certData = [NSData dataWithContentsOfFile:filePath];
  if (!certData) {
  return nil;
  }
  SecCertificateRef cert = SecCertificateCreateWithData(NULL, (CFDataRef)certData);
  SecKeyRef key = NULL;
  SecTrustRef trust = NULL;
  SecPolicyRef policy = NULL;
  if (cert != NULL) {
  policy = SecPolicyCreateBasicX509();
  if (policy) {
  if (SecTrustCreateWithCertificates((CFTypeRef)cert, policy, &trust) == noErr) {
  SecTrustResultType result;
  if (SecTrustEvaluate(trust, &result) == noErr) {
  key = SecTrustCopyPublicKey(trust);
  }
  }
  }
  }
  if (policy) CFRelease(policy);
  if (trust) CFRelease(trust);
  if (cert) CFRelease(cert);
  return key;
  }

• (NSString *)encryptString:(NSString *)str publicKeyRef:(SecKeyRef)publicKeyRef{
  if(![str dataUsingEncoding:NSUTF8StringEncoding]){
  return nil;
  }
  if(!publicKeyRef){
  return nil;
  }
  NSData *data = [self encryptData:[str dataUsingEncoding:NSUTF8StringEncoding] withKeyRef:publicKeyRef];
  NSString *ret = base64_encode_data(data);
  return ret;
  }

pragma mark - 使用'.12'私钥文件解密

//解密

• (NSString *)decryptString:(NSString *)str privateKeyWithContentsOfFile:(NSString *)path password:(NSString *)password{
  if (!str || !path) return nil;
  if (!password) password = @"";
  return [self decryptString:str privateKeyRef:[self getPrivateKeyRefWithContentsOfFile:path password:password]];
  }

//获取私钥

• (SecKeyRef)getPrivateKeyRefWithContentsOfFile:(NSString )filePath password:(NSString)password{

  NSData *p12Data = [NSData dataWithContentsOfFile:filePath];
  if (!p12Data) {
  return nil;
  }
  SecKeyRef privateKeyRef = NULL;
  NSMutableDictionary * options = [[NSMutableDictionary alloc] init];
  [options setObject: password forKey:(__bridge id)kSecImportExportPassphrase];
  CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL);
  OSStatus securityError = SecPKCS12Import((__bridge CFDataRef) p12Data, (__bridge CFDictionaryRef)options, &items);
  if (securityError == noErr && CFArrayGetCount(items) > 0) {
  CFDictionaryRef identityDict = CFArrayGetValueAtIndex(items, 0);
  SecIdentityRef identityApp = (SecIdentityRef)CFDictionaryGetValue(identityDict, kSecImportItemIdentity);
  securityError = SecIdentityCopyPrivateKey(identityApp, &privateKeyRef);
  if (securityError != noErr) {
  privateKeyRef = NULL;
  }
  }
  CFRelease(items);

  return privateKeyRef;
  }

• (NSString *)decryptString:(NSString *)str privateKeyRef:(SecKeyRef)privKeyRef{
  NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
  if (!privKeyRef) {
  return nil;
  }
  data = [self decryptData:data withKeyRef:privKeyRef];
  NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  return ret;
  }

pragma mark - 使用公钥字符串加密

/* START: Encryption with RSA public key */

//使用公钥字符串加密

• (NSString *)encryptString:(NSString *)str publicKey:(NSString *)pubKey{
  NSData *data = [self encryptData:[str dataUsingEncoding:NSUTF8StringEncoding] publicKey:pubKey];
  NSString *ret = base64_encode_data(data);
  return ret;
  }

• (NSData *)encryptData:(NSData *)data publicKey:(NSString *)pubKey{
  if(!data || !pubKey){
  return nil;
  }
  SecKeyRef keyRef = [self addPublicKey:pubKey];
  if(!keyRef){
  return nil;
  }
  return [self encryptData:data withKeyRef:keyRef];
  }

• (SecKeyRef)addPublicKey:(NSString *)key{
  NSRange spos = [key rangeOfString:@"-----BEGIN PUBLIC KEY-----"];
  NSRange epos = [key rangeOfString:@"-----END PUBLIC KEY-----"];
  if(spos.location != NSNotFound && epos.location != NSNotFound){
  NSUInteger s = spos.location + spos.length;
  NSUInteger e = epos.location;
  NSRange range = NSMakeRange(s, e-s);
  key = [key substringWithRange:range];
  }
  key = [key stringByReplacingOccurrencesOfString:@"\r" withString:@""];
  key = [key stringByReplacingOccurrencesOfString:@"\n" withString:@""];
  key = [key stringByReplacingOccurrencesOfString:@"\t" withString:@""];
  key = [key stringByReplacingOccurrencesOfString:@" " withString:@""];

  // This will be base64 encoded, decode it.
  NSData *data = base64_decode(key);
  data = [self stripPublicKeyHeader:data];
  if(!data){
  return nil;
  }

  //a tag to read/write keychain storage
  NSString *tag = @"RSAUtil_PubKey";
  NSData *d_tag = [NSData dataWithBytes:[tag UTF8String] length:[tag length]];

  // Delete any old lingering key with the same tag
  NSMutableDictionary *publicKey = [[NSMutableDictionary alloc] init];
  [publicKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];
  [publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
  [publicKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];
  SecItemDelete((__bridge CFDictionaryRef)publicKey);

  // Add persistent version of the key to system keychain
  [publicKey setObject:data forKey:(__bridge id)kSecValueData];
  [publicKey setObject:(__bridge id) kSecAttrKeyClassPublic forKey:(__bridge id)
  kSecAttrKeyClass];
  [publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)
  kSecReturnPersistentRef];

  CFTypeRef persistKey = nil;
  OSStatus status = SecItemAdd((__bridge CFDictionaryRef)publicKey, &persistKey);
  if (persistKey != nil){
  CFRelease(persistKey);
  }
  if ((status != noErr) && (status != errSecDuplicateItem)) {
  return nil;
  }

  [publicKey removeObjectForKey:(__bridge id)kSecValueData];
  [publicKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];
  [publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
  [publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];

  // Now fetch the SecKeyRef version of the key
  SecKeyRef keyRef = nil;
  status = SecItemCopyMatching((__bridge CFDictionaryRef)publicKey, (CFTypeRef *)&keyRef);
  if(status != noErr){
  return nil;
  }
  return keyRef;
  }

• (NSData *)stripPublicKeyHeader:(NSData *)d_key{
  // Skip ASN.1 public key header
  if (d_key == nil) return(nil);

  unsigned long len = [d_key length];
  if (!len) return(nil);

  unsigned char *c_key = (unsigned char *)[d_key bytes];
  unsigned int idx = 0;

  if (c_key[idx++] != 0x30) return(nil);

  if (c_key[idx] > 0x80) idx += c_key[idx] - 0x80 + 1;
  else idx++;

  // PKCS #1 rsaEncryption szOID_RSA_RSA
  static unsigned char seqiod[] =
  { 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01,
  0x01, 0x05, 0x00 };
  if (memcmp(&c_key[idx], seqiod, 15)) return(nil);

  idx += 15;

  if (c_key[idx++] != 0x03) return(nil);

  if (c_key[idx] > 0x80) idx += c_key[idx] - 0x80 + 1;
  else idx++;

  if (c_key[idx++] != '\0') return(nil);

  // Now make a new NSData from this buffer
  return ([NSData dataWithBytes:&c_key[idx] length:len - idx]);
  }

• (NSData *)encryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef{
  const uint8_t *srcbuf = (const uint8_t *)[data bytes];
  size_t srclen = (size_t)data.length;

  size_t block_size = SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);
  void *outbuf = malloc(block_size);
  size_t src_block_size = block_size - 11;

  NSMutableData *ret = [[NSMutableData alloc] init];
  for(int idx=0; idx<srclen; idx+=src_block_size){
  //NSLog(@"%d/%d block_size: %d", idx, (int)srclen, (int)block_size);
  size_t data_len = srclen - idx;
  if(data_len > src_block_size){
  data_len = src_block_size;
  }

    size_t outlen = block_size;
    OSStatus status = noErr;
    status = SecKeyEncrypt(keyRef,
                           kSecPaddingPKCS1,
                           srcbuf + idx,
                           data_len,
                           outbuf,
                           &outlen
                           );
    if (status != 0) {
        NSLog(@"SecKeyEncrypt fail. Error Code: %d", status);
        ret = nil;
        break;
    }else{
        [ret appendBytes:outbuf length:outlen];
    }
  

  }

  free(outbuf);
  CFRelease(keyRef);
  return ret;
  }

/* END: Encryption with RSA public key */

pragma mark - 使用私钥字符串解密

/* START: Decryption with RSA private key */

//使用私钥字符串解密

• (NSString *)decryptString:(NSString *)str privateKey:(NSString *)privKey{
  if (!str) return nil;
  NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
  data = [self decryptData:data privateKey:privKey];
  NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
  return ret;
  }

• (NSData *)decryptData:(NSData *)data privateKey:(NSString *)privKey{
  if(!data || !privKey){
  return nil;
  }
  SecKeyRef keyRef = [self addPrivateKey:privKey];
  if(!keyRef){
  return nil;
  }
  return [self decryptData:data withKeyRef:keyRef];
  }

• (SecKeyRef)addPrivateKey:(NSString *)key{
  NSRange spos = [key rangeOfString:@"-----BEGIN RSA PRIVATE KEY-----"];
  NSRange epos = [key rangeOfString:@"-----END RSA PRIVATE KEY-----"];
  if(spos.location != NSNotFound && epos.location != NSNotFound){
  NSUInteger s = spos.location + spos.length;
  NSUInteger e = epos.location;
  NSRange range = NSMakeRange(s, e-s);
  key = [key substringWithRange:range];
  }
  key = [key stringByReplacingOccurrencesOfString:@"\r" withString:@""];
  key = [key stringByReplacingOccurrencesOfString:@"\n" withString:@""];
  key = [key stringByReplacingOccurrencesOfString:@"\t" withString:@""];
  key = [key stringByReplacingOccurrencesOfString:@" " withString:@""];

  // This will be base64 encoded, decode it.
  NSData *data = base64_decode(key);
  data = [self stripPrivateKeyHeader:data];
  if(!data){
  return nil;
  }

  //a tag to read/write keychain storage
  NSString *tag = @"RSAUtil_PrivKey";
  NSData *d_tag = [NSData dataWithBytes:[tag UTF8String] length:[tag length]];

  // Delete any old lingering key with the same tag
  NSMutableDictionary *privateKey = [[NSMutableDictionary alloc] init];
  [privateKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];
  [privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
  [privateKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];
  SecItemDelete((__bridge CFDictionaryRef)privateKey);

  // Add persistent version of the key to system keychain
  [privateKey setObject:data forKey:(__bridge id)kSecValueData];
  [privateKey setObject:(__bridge id) kSecAttrKeyClassPrivate forKey:(__bridge id)
  kSecAttrKeyClass];
  [privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)
  kSecReturnPersistentRef];

  CFTypeRef persistKey = nil;
  OSStatus status = SecItemAdd((__bridge CFDictionaryRef)privateKey, &persistKey);
  if (persistKey != nil){
  CFRelease(persistKey);
  }
  if ((status != noErr) && (status != errSecDuplicateItem)) {
  return nil;
  }

  [privateKey removeObjectForKey:(__bridge id)kSecValueData];
  [privateKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];
  [privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
  [privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];

  // Now fetch the SecKeyRef version of the key
  SecKeyRef keyRef = nil;
  status = SecItemCopyMatching((__bridge CFDictionaryRef)privateKey, (CFTypeRef *)&keyRef);
  if(status != noErr){
  return nil;
  }
  return keyRef;
  }

• (NSData *)stripPrivateKeyHeader:(NSData *)d_key{
  // Skip ASN.1 private key header
  if (d_key == nil) return(nil);

  unsigned long len = [d_key length];
  if (!len) return(nil);

  unsigned char *c_key = (unsigned char *)[d_key bytes];
  unsigned int idx = 22; //magic byte at offset 22

  if (0x04 != c_key[idx++]) return nil;

  //calculate length of the key
  unsigned int c_len = c_key[idx++];
  int det = c_len & 0x80;
  if (!det) {
  c_len = c_len & 0x7f;
  } else {
  int byteCount = c_len & 0x7f;
  if (byteCount + idx > len) {
  //rsa length field longer than buffer
  return nil;
  }
  unsigned int accum = 0;
  unsigned char *ptr = &c_key[idx];
  idx += byteCount;
  while (byteCount) {
  accum = (accum << 8) + *ptr;
  ptr++;
  byteCount--;
  }
  c_len = accum;
  }

  // Now make a new NSData from this buffer
  return [d_key subdataWithRange:NSMakeRange(idx, c_len)];
  }

• (NSData *)decryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef{
  const uint8_t *srcbuf = (const uint8_t *)[data bytes];
  size_t srclen = (size_t)data.length;

  size_t block_size = SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);
  UInt8 *outbuf = malloc(block_size);
  size_t src_block_size = block_size;

  NSMutableData *ret = [[NSMutableData alloc] init];
  for(int idx=0; idx<srclen; idx+=src_block_size){
  //NSLog(@"%d/%d block_size: %d", idx, (int)srclen, (int)block_size);
  size_t data_len = srclen - idx;
  if(data_len > src_block_size){
  data_len = src_block_size;
  }

    size_t outlen = block_size;
    OSStatus status = noErr;
    status = SecKeyDecrypt(keyRef,
                           kSecPaddingNone,
                           srcbuf + idx,
                           data_len,
                           outbuf,
                           &outlen
                           );
    if (status != 0) {
        NSLog(@"SecKeyEncrypt fail. Error Code: %d", status);
        ret = nil;
        break;
    }else{
        //the actual decrypted data is in the middle, locate it!
        int idxFirstZero = -1;
        int idxNextZero = (int)outlen;
        for ( int i = 0; i < outlen; i++ ) {
            if ( outbuf[i] == 0 ) {
                if ( idxFirstZero < 0 ) {
                    idxFirstZero = i;
                } else {
                    idxNextZero = i;
                    break;
                }
            }
        }
  
        [ret appendBytes:&outbuf[idxFirstZero+1] length:idxNextZero-idxFirstZero-1];
    }
  

  }

  free(outbuf);
  CFRelease(keyRef);
  return ret;
  }

/* END: Decryption with RSA private key */

@end

4. 测试加密、解密

首先先测试使用.der和.p12秘钥文件进行加密、解密, 在ViewController.m中进行测试, 代码如下:

import "ViewController.h"

import "RSAEncryptor.h"

@interface ViewController ()

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];

  //原始数据
  NSString *originalString = @"这是一段将要使用'.der'文件加密的字符串!";

  //使用.der和.p12中的公钥私钥加密解密
  NSString *public_key_path = [[NSBundle mainBundle] pathForResource:@"public_key.der" ofType:nil];
  NSString *private_key_path = [[NSBundle mainBundle] pathForResource:@"private_key.p12" ofType:nil];

  NSString *encryptStr = [RSAEncryptor encryptString:originalString publicKeyWithContentsOfFile:public_key_path];
  NSLog(@"加密前:%@", originalString);
  NSLog(@"加密后:%@", encryptStr);
  NSLog(@"解密后:%@", [RSAEncryptor decryptString:encryptStr privateKeyWithContentsOfFile:private_key_path password:@"123456"]);

}

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

@end
运行后, 输出信息如下:

输出结果
可以看到已经可以成功加密、解密了.

下面接着测试使用秘钥字符串进行加密、解密, 那么秘钥字符串从哪里来? 可以来这里:http://web.chacuo.net/netrsakeypair, 这是一个在线生成RSA秘钥的网站, 生成公钥和秘钥后, 复制出来用于测试. 然后在ViewController.m中使用RSAEntryptor.h头文件中对应的加密方法进行加密, ViewController.m中代码如下:

import "ViewController.h"

import "RSAEncryptor.h"

@interface ViewController ()

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];

  //原始数据
  NSString *originalString = @"这是一段将要使用'秘钥字符串'进行加密的字符串!";

  //使用字符串格式的公钥私钥加密解密
  NSString *encryptStr = [RSAEncryptor encryptString:originalString publicKey:@"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDTbZ6cNH9PgdF60aQKveLz3FTalyzHQwbp601y77SzmGHX3F5NoVUZbdK7UMdoCLK4FBziTewYD9DWvAErXZo9BFuI96bAop8wfl1VkZyyHTcznxNJFGSQd/B70/ExMgMBpEwkAAdyUqIjIdVGh1FQK/4acwS39YXwbS+IlHsPSQIDAQAB"];

  NSLog(@"加密前:%@", originalString);
  NSLog(@"加密后:%@", encryptStr);
  NSLog(@"解密后:%@", [RSAEncryptor decryptString:encryptStr privateKey:@"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"]);

}

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

@end
运行后, 输出信息如下:

输出结果

可以看到,也成功加密、解密了.

至此, RSA加密演示完毕!

链接：http://www.jianshu.com/p/74a796ec5038
來源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。