OC RSA加密解密

好久好久没有更新了。。。你们等的急不急。。这不，我就姗姗来迟了。。。本文重点讲解一下iOS系统下的RSA加密解密问题。

一般为了安全，私钥是不会给前端暴露出来 的，只会通过私钥生成一个公开的公钥提供给外部对数据进行加密。将加密后的数据传给后端，后端使用私钥解密。比如支付宝支付，对接过这个支付的前端应该都知道。RSA的加密强度又有1024、2048之分，值越大，加密强度越高。

具体的使用场景分为两种：

1、自己有公钥文件，即后端生成的给你的一个.der文件，你将其放到你的项目中读取使用

2、你调用接口给你直接返回公钥内容，你只是根据公钥直接加密数据

针对以上两种使用场景，特封装以下两组方法，自己根据实际具体使用。

先上代码：头文件RSATools.h

//
//  RSAtools.h
//  SGBProject
//
//  Created by carbonzhao on 2022/11/23.
//  Copyright © 2022 ZJKJ. All rights reserved.
//

#import 
#import 

NS_ASSUME_NONNULL_BEGIN

@interface RSATools : NSObject
#pragma mark -公钥、私钥文件
/**
 * 加密方法,如果你使用的是公钥文件
 *
 * @param str 需要加密的字符串
 * @param path '.der'格式的公钥文件路径
 */
+ (NSString *)encryptPlainText:(NSString *)str publicKeyWithContentsOfFile:(NSString *)path;
/**
 * 解密方法，如果你使用的是私钥文件，密码可为空，根据具体实际使用场景传值
 *
 * @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 *)decryptPlainText:(NSString *)str privateKeyWithContentsOfFile:(NSString *)path password:(NSString *)password;

#pragma mark - 公钥私钥数据
/**
 * 加密方法
 *
 * @param str 需要加密的字符串,此时不存在文件访问密码，故而不需要设置密码
 * @param pubKey 公钥字符串
 */
+ (NSString *)encryptPlainText:(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 *)decryptPlainText:(NSString *)str privateKey:(NSString *)privKey;
@end

NS_ASSUME_NONNULL_END

实现文件：RSATools.m

//
//  RSATools.m
//  RSA
//
//  Created by carbonzhao on 2022/11/23.
//

#import "RSATools.h"
#import 

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;
}


@implementation RSATools

#pragma mark - 使用'.der'公钥文件加密
//加密
+ (NSString *)encryptPlainText:(NSString *)str publicKeyWithContentsOfFile:(NSString *)path
{
    if (!str || !path) return nil;
    return [self encryptPlainText: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) {
                CFErrorRef errRef;
                
                if (SecTrustEvaluateWithError(trust, &errRef))
                {
                    key = SecTrustCopyKey(trust);
                }
            }
        }
    }
    if (policy) CFRelease(policy);
    if (trust) CFRelease(trust);
    if (cert) CFRelease(cert);
    return key;
}


+ (NSString *)encryptPlainText:(NSString *)str publicKeyRef:(SecKeyRef)publicKeyRef
{
    if(![str dataUsingEncoding:NSUTF8StringEncoding] || !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 *)decryptPlainText:(NSString *)str privateKeyWithContentsOfFile:(NSString *)path password:(NSString *)password
{
    if (!str || !path)
    {
        return nil;
    }
    if (!password)
    {
        password = @"";
    }
    return [self decryptPlainText: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 *)decryptPlainText:(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 *)encryptPlainText:(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 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 *)decryptPlainText:(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 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

测试方法：首先先登录下面的网站: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.注意使用时要删除掉前面:

-----BEGIN PUBLIC KEY-----

-----END PUBLIC KEY-----

-----BEGIN PRIVATE KEY-----

-----END PRIVATE KEY-----

这两组标签，同时删除回车换行符！！！！。

 

NSString *encryptStr = [RSATools encryptPlainText:originalString publicKey:@"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA+MWh4qVoaGpC17Fh9Ybbci9dQpJ6SUAqKCcT4SVcRFyvLQqj68RLDHZsA9TcjSYUpm2YS7bi0vJXPBHRgZpthhH6wcEgF+7OAdQAfKsaQ20wHjUMU8k5qyK8KGj6oVbWJxGoFOtKSXNdRLSn9immUX+EDZvcfzkd8NSJV/SDTunHxtIZ/w/KHnMeeSioNpNq2lKnQsXeJzA9CDoc1tUMbcVmKO0Rplygq4bOOQTFBZnzzGIxNjJFPo24IUEQ3mwl/36NvioT9vva4XJy+DY1Xz+7QY+rPb9FmW5rbg+TuYc7J+82BpJ2BihLt/b2507UFsNgJ6SMmn3cmX0INdr0mwIDAQAB"];
    NSLog(@"加密前:%@", originalString);
    NSLog(@"加密后:%@", encryptStr);
    NSString *deText = [RSATools decryptPlainText:encryptStr privateKey:@"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"];
    NSLog(@"解密后:%@", deText);