RSA 加密解密多语言实现方案

作者 : 松哥资源 本文共19983个字,预计阅读时间需要50分钟 发布时间: 2016-09-3 共865人阅读




示例标题

生成相关文件

  1. 生成模长为1024bit的私钥文件private_key.pem
cd rsa_multi_language

openssl genrsa -out private_key.pem 1024
  1. 生成IOS证书
1. 生成证书请求文件rsaCertReq-IOS.csr
openssl req -new -key private_key.pem -out rsaCerReq-IOS.csr

2. 生成证书rsaCert.crt,并设置有效时间为10年
openssl x509 -req -days 36500 -in rsaCerReq-IOS.csr -signkey private_key.pem -out rsaCert-IOS.crt

3. 生成供iOS使用的公钥文件public_key.der
openssl x509 -outform der -in rsaCert-IOS.crt -out public_key-IOS.der

4. 生成供iOS使用的私钥文件private_key.p12
openssl pkcs12 -export -out private_key-IOS.p12 -inkey private_key.pem -in rsaCert-IOS.crt

密码:sirenbang

openssl req -new -key private_key.pem -out rsaCerReq-IOS.csr

  1. 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
  1. 生成通用公钥rsa_public_key.pem
openssl rsa -in private_key.pem -out rsa_public_key.pem -pubout
  1. 生成rsa公钥 供python等使用 py_public_key.pem
openssl rsa -in private_key.pem -RSAPublicKey_out -out py_public_key.pem 

代码

JAVA代码

工具类:

import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.pkcs.RSAPrivateKeyStructure;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import sun.misc.BASE64Decoder;

import javax.crypto.Cipher;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.Key;
import java.security.KeyFactory;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.X509EncodedKeySpec;


public class RSAEncryptUtils {

    public static RSAPublicKey loadPublicKey(InputStream in) {
        return loadPublicKey(readKeyAsString(in));
    }

    public static RSAPublicKey loadPublicKey(String publicKeyStr) {
        try {
            BASE64Decoder base64Decoder = new BASE64Decoder();
            byte[] buffer = base64Decoder.decodeBuffer(publicKeyStr);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static RSAPrivateKey loadPrivateKey(InputStream in) {
        return loadPrivateKey(readKeyAsString(in));
    }

    public static RSAPrivateKey loadPrivateKey(String privateKeyStr) {
        //pkcs8
        try {
            BASE64Decoder base64Decoder = new BASE64Decoder();
            byte[] buffer = base64Decoder.decodeBuffer(privateKeyStr);
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
        } catch (Exception ex) {
            //pkcs1
            try {
                RSAPrivateKeyStructure asn1PrivKey = new RSAPrivateKeyStructure((ASN1Sequence) ASN1Sequence.fromByteArray(new BASE64Decoder().decodeBuffer(privateKeyStr)));
                RSAPrivateKeySpec rsaPrivKeySpec = new RSAPrivateKeySpec(asn1PrivKey.getModulus(), asn1PrivKey.getPrivateExponent());
                KeyFactory keyFactory = KeyFactory.getInstance("RSA");
                return (RSAPrivateKey) keyFactory.generatePrivate(rsaPrivKeySpec);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

    public static byte[] encrypt(Key publicOrPrivateKey, byte[] data) {
        return endecrypt(publicOrPrivateKey, data, Cipher.ENCRYPT_MODE);
    }

    public static byte[] decrypt(Key publicOrPrivateKey, byte[] data) {
        return endecrypt(publicOrPrivateKey, data, Cipher.DECRYPT_MODE);
    }

    private static byte[] endecrypt(Key publicOrPrivateKey, byte[] data, int mode) {
        if (publicOrPrivateKey == null) {
            throw new RuntimeException("加密或公钥不能为空");
        }
        Cipher cipher = null;
        try {
            cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", new BouncyCastleProvider());
            cipher.init(mode, publicOrPrivateKey);
            byte[] output = cipher.doFinal(data);
            return output;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private static String readKeyAsString(InputStream in) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String readLine = null;
            StringBuilder sb = new StringBuilder();
            while ((readLine = br.readLine()) != null) {
                if (readLine.charAt(0) == '-') {
                    continue;
                } else {
                    sb.append(readLine);
                    sb.append('\r');
                }
            }
            return sb.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

测试类:

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;

public class RSAEncryptTest {

    public static void main(String[] args) {

        RSAPublicKey rsaPublicKey = RSAEncryptUtils.loadPublicKey(RSAEncryptUtils.class.getResourceAsStream("/rsa_public_key.pem"));
        RSAPrivateKey rsaPrivateKey = RSAEncryptUtils.loadPrivateKey(RSAEncryptUtils.class.getResourceAsStream("/pkcs8_private_key.pem"));

        //测试字符串
        String encryptStr = "aabbcc123我的";
        System.out.println("原始字符串:" + encryptStr + "\n\n");
        try {
            //加密
            byte[] cipher = RSAEncryptUtils.encrypt(rsaPublicKey, encryptStr.getBytes());
            String encode = new BASE64Encoder().encode(cipher);
            System.out.println("公钥加密后:" + encode);


            cipher = (new BASE64Decoder().decodeBuffer(encode));
            //解密
            byte[] plainText = RSAEncryptUtils.decrypt(rsaPrivateKey, cipher);
            System.out.println("私钥解密后:" + new String(plainText));
        } catch (Exception e) {
            System.err.println(e.getMessage());
        }

        System.out.println("\n\n");

        try {
            //加密
            byte[] cipher = RSAEncryptUtils.encrypt(rsaPrivateKey, encryptStr.getBytes());
            String encode = new BASE64Encoder().encode(cipher);
            System.out.println("私钥加密后:" + encode);


            cipher = (new BASE64Decoder().decodeBuffer(encode));
            //解密
            byte[] plainText = RSAEncryptUtils.decrypt(rsaPublicKey, cipher);
            System.out.println("公钥解密后:" + new String(plainText));
        } catch (Exception e) {
            System.err.println(e.getMessage());
        }
    }

}

java代码运行结果:

java代码运行结果

IOS代码

RSAEncryptor.h :

#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 :


#import "RSAEncryptor.h"
#import <Security/Security.h>

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 RSAEncryptor

//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

测试代码(ViewController.m):


#import "ViewController.h"
#import "RSAEncryptor.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //原始字符串
    NSString *originalString = @"aabbcc123我的";
    NSString *public_key_path = [[NSBundle mainBundle] pathForResource:@"public_key-IOS.der" ofType:nil];
    NSString *private_key_path = [[NSBundle mainBundle] pathForResource:@"private_key-IOS.p12" ofType:nil];
    
    NSLog(@"原始字符串:%@\n", originalString);
    
    //使用公钥加密
    NSString *encryptStr = [RSAEncryptor encryptString:originalString publicKeyWithContentsOfFile:public_key_path];
    NSLog(@"使用公钥加密后:%@\n", encryptStr);
    
    //使用私钥解密
    NSLog(@"使用私钥解密后:%@\n\n", [RSAEncryptor decryptString:encryptStr privateKeyWithContentsOfFile:private_key_path password:@"sirenbang"]);
    
    //通过java代码使用公钥加密后的字符串
    NSString * encryptedStrByJavaWithPublicKey = @"aDuXxkcEK4RZqt47GRM33Op77pFZMgb7VmVrlcWPO5jQMAIkE+7RS2zXNPX4uSwXafAFYG4y99vOwrgl8J5IMDo/7uvQtilb66z2oCUfXfWyXAt2gkJue4nJkcjiTKvNGUj4t3672pbo3DyGwGvY/2F1Ydc76Wwo96DN/rlkt5E=";
    
    //解密java语言使用公钥加密后的字符串
    NSLog(@"java语言使用公钥加密后:%@\n", encryptedStrByJavaWithPublicKey);
    NSLog(@"解密后的字符串:%@", [RSAEncryptor decryptString:encryptedStrByJavaWithPublicKey privateKeyWithContentsOfFile:private_key_path password:@"sirenbang"]);
}


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


@end

IOS代码运行结果:

IOS代码运行结果

Python代码

python代码没有验证过,但应该没啥问题

import rsa
import base64

# 导入key
with open('py_public_key.pem') as publickfile:
    p = publickfile.read()
    pubkey = rsa.PublicKey.load_pkcs1(p)

with open('private_key.pem') as privatefile:
    p = privatefile.read()
    privkey = rsa.PrivateKey.load_pkcs1(p)

bob_pub = pubkey
bob_priv = privkey

message = """{"id": "49187f817657ecd9d472562b16c0ec7c","ip": "180.168.161.194","user-agent": "iOS8.1 iPhone 5s","ts": "1478879016008","channel": "iOS"}"""

# 数据分割函数
def format_str(string, width):
    format_list = [string[x:x+width] for x in range(0,len(string),width)]
    return format_list
# 按大小分割数据
str_list = format_str(message,117)

# 加密
data_list = []
for _str in str_list:
    data_list.append(base64.encodestring(rsa.encrypt(_str, bob_pub)))

# 解密
_data_list = []
for data in data_list.append:
    _data_list.append(rsa.decrypt(base64.decodestring(data), bob_priv))

_message = "".join(_data_list.append)
print _message



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文章来源于justsoso.fun: RSA 加密解密多语言实现方案





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