• 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

    1. //
    2. //  RSAtools.h
    3. //  SGBProject
    4. //
    5. //  Created by carbonzhao on 2022/11/23.
    6. //  Copyright © 2022 ZJKJ. All rights reserved.
    7. //
    8.  
    9. #import 
    10. #import 
    11.  
    12. NS_ASSUME_NONNULL_BEGIN
    13.  
    14. @interface RSATools : NSObject
    15. #pragma mark -公钥、私钥文件
    16. /**
    17.  * 加密方法,如果你使用的是公钥文件
    18.  *
    19.  * @param str 需要加密的字符串
    20.  * @param path '.der'格式的公钥文件路径
    21.  */
    22. + (NSString *)encryptPlainText:(NSString *)str publicKeyWithContentsOfFile:(NSString *)path;
    23. /**
    24.  * 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
    25.  *
    26.  * @param str 需要解密的字符串
    27.  * @param path '.p12'格式的私钥文件路径
    28.  * @param password 私钥文件密码
    29.  */
    30. + (NSString *)decryptPlainText:(NSString *)str privateKeyWithContentsOfFile:(NSString *)path password:(NSString *)password;
    31.  
    32. #pragma mark - 公钥私钥数据
    33. /**
    34.  * 加密方法
    35.  *
    36.  * @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
    37.  * @param pubKey 公钥字符串
    38.  */
    39. + (NSString *)encryptPlainText:(NSString *)str publicKey:(NSString *)pubKey;
    40. /**
    41.  * 解密方法
    42.  *
    43.  * @param str 需要解密的字符串
    44.  * @param privKey 私钥字符串
    45.  */
    46. + (NSString *)decryptPlainText:(NSString *)str privateKey:(NSString *)privKey;
    47. @end
    48.  
    49. NS_ASSUME_NONNULL_END

    实现文件：RSATools.m

    1. //
    2. //  RSATools.m
    3. //  RSA
    4. //
    5. //  Created by carbonzhao on 2022/11/23.
    6. //
    7.  
    8. #import "RSATools.h"
    9. #import 
    10.  
    11. static NSString *base64_encode_data(NSData *data){
    12.     data = [data base64EncodedDataWithOptions:0];
    13.     NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    14.     return ret;
    15. }
    16.  
    17. static NSData *base64_decode(NSString *str){
    18.     NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
    19.     return data;
    20. }
    21.  
    22.  
    23. @implementation RSATools
    24.  
    25. #pragma mark - 使用'.der'公钥文件加密
    26. //加密
    27. + (NSString *)encryptPlainText:(NSString *)str publicKeyWithContentsOfFile:(NSString *)path
    28. {
    29.     if (!str || !path) return nil;
    30.     return [self encryptPlainText:str publicKeyRef:[self getPublicKeyRefWithContentsOfFile:path]];
    31. }
    32.  
    33. //获取公钥
    34. + (SecKeyRef)getPublicKeyRefWithContentsOfFile:(NSString *)filePath
    35. {
    36.     NSData *certData = [NSData dataWithContentsOfFile:filePath];
    37.     if (!certData) {
    38.         return nil;
    39.     }
    40.     SecCertificateRef cert = SecCertificateCreateWithData(NULL, (CFDataRef)certData);
    41.     SecKeyRef key = NULL;
    42.     SecTrustRef trust = NULL;
    43.     SecPolicyRef policy = NULL;
    44.     if (cert != NULL) {
    45.         policy = SecPolicyCreateBasicX509();
    46.         if (policy) {
    47.             if (SecTrustCreateWithCertificates((CFTypeRef)cert, policy, &trust) == noErr) {
    48.                 CFErrorRef errRef;
    49.                 
    50.                 if (SecTrustEvaluateWithError(trust, &errRef))
    51.                 {
    52.                     key = SecTrustCopyKey(trust);
    53.                 }
    54.             }
    55.         }
    56.     }
    57.     if (policy) CFRelease(policy);
    58.     if (trust) CFRelease(trust);
    59.     if (cert) CFRelease(cert);
    60.     return key;
    61. }
    62.  
    63.  
    64. + (NSString *)encryptPlainText:(NSString *)str publicKeyRef:(SecKeyRef)publicKeyRef
    65. {
    66.     if(![str dataUsingEncoding:NSUTF8StringEncoding] || !publicKeyRef)
    67.     {
    68.         return nil;
    69.     }
    70.     NSData *data = [self encryptData:[str dataUsingEncoding:NSUTF8StringEncoding] withKeyRef:publicKeyRef];
    71.     NSString *ret = base64_encode_data(data);
    72.     return ret;
    73. }
    74.  
    75.  
    76. #pragma mark - 使用'.12'私钥文件解密
    77. //解密
    78. + (NSString *)decryptPlainText:(NSString *)str privateKeyWithContentsOfFile:(NSString *)path password:(NSString *)password
    79. {
    80.     if (!str || !path)
    81.     {
    82.         return nil;
    83.     }
    84.     if (!password)
    85.     {
    86.         password = @"";
    87.     }
    88.     return [self decryptPlainText:str privateKeyRef:[self getPrivateKeyRefWithContentsOfFile:path password:password]];
    89. }
    90.  
    91. //获取私钥
    92. + (SecKeyRef)getPrivateKeyRefWithContentsOfFile:(NSString *)filePath password:(NSString*)password{
    93.     NSData *p12Data = [NSData dataWithContentsOfFile:filePath];
    94.     if (!p12Data)
    95.     {
    96.         return nil;
    97.     }
    98.     SecKeyRef privateKeyRef = NULL;
    99.     NSMutableDictionary * options = [[NSMutableDictionary alloc] init];
    100.     [options setObject: password forKey:(__bridge id)kSecImportExportPassphrase];
    101.     CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL);
    102.     OSStatus securityError = SecPKCS12Import((__bridge CFDataRef) p12Data, (__bridge CFDictionaryRef)options, &items);
    103.     if (securityError == noErr && CFArrayGetCount(items) > 0)
    104.     {
    105.         CFDictionaryRef identityDict = CFArrayGetValueAtIndex(items, 0);
    106.         SecIdentityRef identityApp = (SecIdentityRef)CFDictionaryGetValue(identityDict, kSecImportItemIdentity);
    107.         securityError = SecIdentityCopyPrivateKey(identityApp, &privateKeyRef);
    108.         if (securityError != noErr)
    109.         {
    110.             privateKeyRef = NULL;
    111.         }
    112.     }
    113.     CFRelease(items);
    114.     return privateKeyRef;
    115. }
    116.  
    117.  
    118. + (NSString *)decryptPlainText:(NSString *)str privateKeyRef:(SecKeyRef)privKeyRef{
    119.     NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
    120.     if (!privKeyRef)
    121.     {
    122.         return nil;
    123.     }
    124.     data = [self decryptData:data withKeyRef:privKeyRef];
    125.     NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    126.     return ret;
    127. }
    128.  
    129.  
    130. #pragma mark - 使用公钥字符串加密
    131. /* START: Encryption with RSA public key */
    132. //使用公钥字符串加密
    133. + (NSString *)encryptPlainText:(NSString *)str publicKey:(NSString *)pubKey
    134. {
    135.     NSData *data = [self encryptData:[str dataUsingEncoding:NSUTF8StringEncoding] publicKey:pubKey];
    136.     NSString *ret = base64_encode_data(data);
    137.     return ret;
    138. }
    139.  
    140.  
    141. + (NSData *)encryptData:(NSData *)data publicKey:(NSString *)pubKey
    142. {
    143.     if(!data || !pubKey){
    144.         return nil;
    145.     }
    146.     SecKeyRef keyRef = [self addPublicKey:pubKey];
    147.     if(!keyRef){
    148.         return nil;
    149.     }
    150.     return [self encryptData:data withKeyRef:keyRef];
    151. }
    152.  
    153.  
    154. + (SecKeyRef)addPublicKey:(NSString *)key
    155. {
    156.     NSRange spos = [key rangeOfString:@"-----BEGIN PUBLIC KEY-----"];
    157.     NSRange epos = [key rangeOfString:@"-----END PUBLIC KEY-----"];
    158.     if(spos.location != NSNotFound && epos.location != NSNotFound){
    159.         NSUInteger s = spos.location + spos.length;
    160.         NSUInteger e = epos.location;
    161.         NSRange range = NSMakeRange(s, e-s);
    162.         key = [key substringWithRange:range];
    163.     }
    164.     key = [key stringByReplacingOccurrencesOfString:@"\r" withString:@""];
    165.     key = [key stringByReplacingOccurrencesOfString:@"\n" withString:@""];
    166.     key = [key stringByReplacingOccurrencesOfString:@"\t" withString:@""];
    167.     key = [key stringByReplacingOccurrencesOfString:@" " withString:@""];
    168.     // This will be base64 encoded, decode it.
    169.     NSData *data = base64_decode(key);
    170.     data = [self stripPublicKeyHeader:data];
    171.     if(!data){
    172.         return nil;
    173.     }
    174.     //a tag to read/write keychain storage
    175.     NSString *tag = @"RSAUtil_PubKey";
    176.     NSData *d_tag = [NSData dataWithBytes:[tag UTF8String] length:[tag length]];
    177.     // Delete any old lingering key with the same tag
    178.     NSMutableDictionary *publicKey = [[NSMutableDictionary alloc] init];
    179.     [publicKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];
    180.     [publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
    181.     [publicKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];
    182.     SecItemDelete((__bridge CFDictionaryRef)publicKey);
    183.     // Add persistent version of the key to system keychain
    184.     [publicKey setObject:data forKey:(__bridge id)kSecValueData];
    185.     [publicKey setObject:(__bridge id) kSecAttrKeyClassPublic forKey:(__bridge id)
    186.      kSecAttrKeyClass];
    187.     [publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)
    188.      kSecReturnPersistentRef];
    189.     CFTypeRef persistKey = nil;
    190.     OSStatus status = SecItemAdd((__bridge CFDictionaryRef)publicKey, &persistKey);
    191.     if (persistKey != nil){
    192.         CFRelease(persistKey);
    193.     }
    194.     if ((status != noErr) && (status != errSecDuplicateItem)) {
    195.         return nil;
    196.     }
    197.     [publicKey removeObjectForKey:(__bridge id)kSecValueData];
    198.     [publicKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];
    199.     [publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
    200.     [publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
    201.     // Now fetch the SecKeyRef version of the key
    202.     SecKeyRef keyRef = nil;
    203.     status = SecItemCopyMatching((__bridge CFDictionaryRef)publicKey, (CFTypeRef *)&keyRef);
    204.     if(status != noErr){
    205.         return nil;
    206.     }
    207.     return keyRef;
    208. }
    209.  
    210.  
    211. + (NSData *)stripPublicKeyHeader:(NSData *)d_key{
    212.     // Skip ASN.1 public key header
    213.     if (d_key == nil) return(nil);
    214.     unsigned long len = [d_key length];
    215.     if (!len) return(nil);
    216.     unsigned char *c_key = (unsigned char *)[d_key bytes];
    217.     unsigned int idx = 0;
    218.     if (c_key[idx++] != 0x30) return(nil);
    219.     if (c_key[idx] > 0x80) idx += c_key[idx] - 0x80 + 1;
    220.     else idx++;
    221.     // PKCS #1 rsaEncryption szOID_RSA_RSA
    222.     static unsigned char seqiod[] =
    223.     { 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01,
    224.         0x01, 0x05, 0x00 };
    225.     if (memcmp(&c_key[idx], seqiod, 15)) return(nil);
    226.     idx += 15;
    227.     if (c_key[idx++] != 0x03) return(nil);
    228.     if (c_key[idx] > 0x80) idx += c_key[idx] - 0x80 + 1;
    229.     else idx++;
    230.     if (c_key[idx++] != '\0') return(nil);
    231.     // Now make a new NSData from this buffer
    232.     return ([NSData dataWithBytes:&c_key[idx] length:len - idx]);
    233. }
    234.  
    235.  
    236. + (NSData *)encryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef{
    237.     const uint8_t *srcbuf = (const uint8_t *)[data bytes];
    238.     size_t srclen = (size_t)data.length;
    239.     size_t block_size = SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);
    240.     void *outbuf = malloc(block_size);
    241.     size_t src_block_size = block_size - 11;
    242.     NSMutableData *ret = [[NSMutableData alloc] init];
    243.     for(int idx=0; idx
    244.         //NSLog(@"%d/%d block_size: %d", idx, (int)srclen, (int)block_size);
    245.         size_t data_len = srclen - idx;
    246.         if(data_len > src_block_size){
    247.             data_len = src_block_size;
    248.         }
    249.         size_t outlen = block_size;
    250.         OSStatus status = noErr;
    251.         status = SecKeyEncrypt(keyRef,
    252.                                kSecPaddingPKCS1,
    253.                                srcbuf + idx,
    254.                                data_len,
    255.                                outbuf,
    256.                                &outlen
    257.                                );
    258.         if (status != 0) {
    259.             NSLog(@"SecKeyEncrypt fail. Error Code: %d", status);
    260.             ret = nil;
    261.             break;
    262.         }else{
    263.             [ret appendBytes:outbuf length:outlen];
    264.         }
    265.     }
    266.     free(outbuf);
    267.     CFRelease(keyRef);
    268.     return ret;
    269. }
    270.  
    271.  
    272. /* END: Encryption with RSA public key */
    273. #pragma mark - 使用私钥字符串解密
    274. /* START: Decryption with RSA private key */
    275. //使用私钥字符串解密
    276. + (NSString *)decryptPlainText:(NSString *)str privateKey:(NSString *)privKey
    277. {
    278.     if (!str) return nil;
    279.     NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
    280.     data = [self decryptData:data privateKey:privKey];
    281.     NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    282.     return ret;
    283. }
    284.  
    285.  
    286. + (NSData *)decryptData:(NSData *)data privateKey:(NSString *)privKey
    287. {
    288.     if(!data || !privKey){
    289.         return nil;
    290.     }
    291.     SecKeyRef keyRef = [self addPrivateKey:privKey];
    292.     if(!keyRef){
    293.         return nil;
    294.     }
    295.     return [self decryptData:data withKeyRef:keyRef];
    296. }
    297.  
    298.  
    299. + (SecKeyRef)addPrivateKey:(NSString *)key
    300. {
    301.     NSRange spos = [key rangeOfString:@"-----BEGIN RSA PRIVATE KEY-----"];
    302.     NSRange epos = [key rangeOfString:@"-----END RSA PRIVATE KEY-----"];
    303.     if(spos.location != NSNotFound && epos.location != NSNotFound){
    304.         NSUInteger s = spos.location + spos.length;
    305.         NSUInteger e = epos.location;
    306.         NSRange range = NSMakeRange(s, e-s);
    307.         key = [key substringWithRange:range];
    308.     }
    309.     key = [key stringByReplacingOccurrencesOfString:@"\r" withString:@""];
    310.     key = [key stringByReplacingOccurrencesOfString:@"\n" withString:@""];
    311.     key = [key stringByReplacingOccurrencesOfString:@"\t" withString:@""];
    312.     key = [key stringByReplacingOccurrencesOfString:@" " withString:@""];
    313.     // This will be base64 encoded, decode it.
    314.     NSData *data = base64_decode(key);
    315.     data = [self stripPrivateKeyHeader:data];
    316.     if(!data){
    317.         return nil;
    318.     }
    319.     //a tag to read/write keychain storage
    320.     NSString *tag = @"RSAUtil_PrivKey";
    321.     NSData *d_tag = [NSData dataWithBytes:[tag UTF8String] length:[tag length]];
    322.     // Delete any old lingering key with the same tag
    323.     NSMutableDictionary *privateKey = [[NSMutableDictionary alloc] init];
    324.     [privateKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];
    325.     [privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
    326.     [privateKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];
    327.     SecItemDelete((__bridge CFDictionaryRef)privateKey);
    328.     // Add persistent version of the key to system keychain
    329.     [privateKey setObject:data forKey:(__bridge id)kSecValueData];
    330.     [privateKey setObject:(__bridge id) kSecAttrKeyClassPrivate forKey:(__bridge id)
    331.      kSecAttrKeyClass];
    332.     [privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)
    333.      kSecReturnPersistentRef];
    334.     CFTypeRef persistKey = nil;
    335.     OSStatus status = SecItemAdd((__bridge CFDictionaryRef)privateKey, &persistKey);
    336.     if (persistKey != nil){
    337.         CFRelease(persistKey);
    338.     }
    339.     if ((status != noErr) && (status != errSecDuplicateItem)) {
    340.         return nil;
    341.     }
    342.     [privateKey removeObjectForKey:(__bridge id)kSecValueData];
    343.     [privateKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];
    344.     [privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
    345.     [privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
    346.     // Now fetch the SecKeyRef version of the key
    347.     SecKeyRef keyRef = nil;
    348.     status = SecItemCopyMatching((__bridge CFDictionaryRef)privateKey, (CFTypeRef *)&keyRef);
    349.     if(status != noErr){
    350.         return nil;
    351.     }
    352.     return keyRef;
    353. }
    354.  
    355.  
    356. + (NSData *)stripPrivateKeyHeader:(NSData *)d_key
    357. {
    358.     // Skip ASN.1 private key header
    359.     if (d_key == nil) return(nil);
    360.     unsigned long len = [d_key length];
    361.     if (!len) return(nil);
    362.     unsigned char *c_key = (unsigned char *)[d_key bytes];
    363.     unsigned int idx = 22; //magic byte at offset 22
    364.     if (0x04 != c_key[idx++]) return nil;
    365.     //calculate length of the key
    366.     unsigned int c_len = c_key[idx++];
    367.     int det = c_len & 0x80;
    368.     if (!det) {
    369.         c_len = c_len & 0x7f;
    370.     } else {
    371.         int byteCount = c_len & 0x7f;
    372.         if (byteCount + idx > len) {
    373.             //rsa length field longer than buffer
    374.             return nil;
    375.         }
    376.         unsigned int accum = 0;
    377.         unsigned char *ptr = &c_key[idx];
    378.         idx += byteCount;
    379.         while (byteCount) {
    380.             accum = (accum << 8) + *ptr;
    381.             ptr++;
    382.             byteCount--;
    383.         }
    384.         c_len = accum;
    385.     }
    386.     // Now make a new NSData from this buffer
    387.     return [d_key subdataWithRange:NSMakeRange(idx, c_len)];
    388. }
    389.  
    390.  
    391. + (NSData *)decryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef{
    392.     const uint8_t *srcbuf = (const uint8_t *)[data bytes];
    393.     size_t srclen = (size_t)data.length;
    394.     size_t block_size = SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);
    395.     UInt8 *outbuf = malloc(block_size);
    396.     size_t src_block_size = block_size;
    397.     NSMutableData *ret = [[NSMutableData alloc] init];
    398.     for(int idx=0; idx
    399.         //NSLog(@"%d/%d block_size: %d", idx, (int)srclen, (int)block_size);
    400.         size_t data_len = srclen - idx;
    401.         if(data_len > src_block_size){
    402.             data_len = src_block_size;
    403.         }
    404.         size_t outlen = block_size;
    405.         OSStatus status = noErr;
    406.         status = SecKeyDecrypt(keyRef,
    407.                                kSecPaddingNone,
    408.                                srcbuf + idx,
    409.                                data_len,
    410.                                outbuf,
    411.                                &outlen
    412.                                );
    413.         if (status != 0) {
    414.             NSLog(@"SecKeyEncrypt fail. Error Code: %d", status);
    415.             ret = nil;
    416.             break;
    417.         }else{
    418.             //the actual decrypted data is in the middle, locate it!
    419.             int idxFirstZero = -1;
    420.             int idxNextZero = (int)outlen;
    421.             for ( int i = 0; i < outlen; i++ ) {
    422.                 if ( outbuf[i] == 0 ) {
    423.                     if ( idxFirstZero < 0 ) {
    424.                         idxFirstZero = i;
    425.                     } else {
    426.                         idxNextZero = i;
    427.                         break;
    428.                     }
    429.                 }
    430.             }
    431.             [ret appendBytes:&outbuf[idxFirstZero+1] length:idxNextZero-idxFirstZero-1];
    432.         }
    433.     }
    434.     free(outbuf);
    435.     CFRelease(keyRef);
    436.     return ret;
    437. }
    438. @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！！！！。

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

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  • 原文地址：https://blog.csdn.net/yunhuaikong/article/details/127996085