RSA加密解密(读取文件)
2016-08-09 17:46
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RSA加密解密需要用到一对公私钥。在ios端是使用公钥加密,用私钥解密。而在java服务端是可以通用的。这次讲解一下从文件读取的公私钥,用来加密的问题。
至于openssl的安装和用途就不介绍了,网上很多方法。这里介绍的是如何使用openssl和openssl生成公私钥后如何使用到ios端。
网上有很多终端运行语句,这里简单标注下
安装完毕openssl后
以上是生成公私钥的文件,下面讲解ios端需要的操作
1.将private_key.p12和public_key.der导入到工程中。
2.新建一个继承NSObjcect的类RSADeal
3.RSADeal.h中声明方法如下
在.m方法中实现方法
至于openssl的安装和用途就不介绍了,网上很多方法。这里介绍的是如何使用openssl和openssl生成公私钥后如何使用到ios端。
网上有很多终端运行语句,这里简单标注下
安装完毕openssl后
//第一步直接输入openssl进入openssl openssl //第二步生成私钥pem文件 genrsa -out private_key.pem 1024 //第三步将pem文件转换成csr文件 openssl req -new -key private_key.pem -out rsaCertReq.csr //第四步生成带时效的crt文件 x509 -req -days 3650 -in rsaCertReq.csr -signkey private_key.pem -out rsaCert.crt //第五步导出ios端需要使用的公钥der文件 x509 -outform der -in rsaCert.crt -out public_key.der //第六步生成crt文件 pkcs12 -export -out private_key.p12 -inkey private_key.pem -in rsaCert.crt //第七步从私钥pem中导出JAVA端需要的公钥pem文件 rsa -in private_key.pem -out rsa_public_key.pem -pubout //第八步私钥用于JAVA端的pem文件 pkcs8 -topk8 -in private_key.pem -out pkcs8_private_key.pem -nocrypt
以上是生成公私钥的文件,下面讲解ios端需要的操作
1.将private_key.p12和public_key.der导入到工程中。
2.新建一个继承NSObjcect的类RSADeal
3.RSADeal.h中声明方法如下
-(void) loadPublicKeyFromFile: (NSString*) derFilePath; -(void) loadPublicKeyFromData: (NSData*) derData; -(void) loadPrivateKeyFromFile: (NSString*) p12FilePath password:(NSString*)p12Password; -(void) loadPrivateKeyFromData: (NSData*) p12Data password:(NSString*)p12Password; -(NSString*) rsaEncryptString:(NSString*)string; -(NSData*) rsaEncryptData:(NSData*)data ; -(NSString*) rsaDecryptString:(NSString*)string; -(NSData*) rsaDecryptData:(NSData*)data; -(BOOL) rsaSHA1VerifyData:(NSData *) plainData withSignature:(NSData *) signature; #pragma mark - Class Methods +(void) setSharedInstance: (RSADeal*)instance; +(RSADeal*) sharedInstance;
在.m方法中实现方法
static RSADeal* sharedInstance = nil; +(void) setSharedInstance: (RSADeal*)instance { sharedInstance = instance; } +(RSADeal*) sharedInstance { return sharedInstance; } -(void)dealloc { if (nil != publicKey) { CFRelease(publicKey); } if (nil != privateKey) { CFRelease(privateKey); } }
#pragma mark-从本地文件中获取公私钥 -(SecKeyRef) getPublicKey { return publicKey; } -(SecKeyRef) getPrivateKey { return privateKey; } -(void) loadPublicKeyFromFile: (NSString*) derFilePath { NSData *derData = [[NSData alloc] initWithContentsOfFile:derFilePath]; [self loadPublicKeyFromData: derData]; } -(void) loadPublicKeyFromData: (NSData*) derData { publicKey = [self getPublicKeyRefrenceFromeData: derData]; } -(void) loadPrivateKeyFromFile: (NSString*) p12FilePath password:(NSString*)p12Password { NSData *p12Data = [NSData dataWithContentsOfFile:p12FilePath]; [self loadPrivateKeyFromData: p12Data password:p12Password]; } -(void) loadPrivateKeyFromData: (NSData*) p12Data password:(NSString*)p12Password { privateKey = [self getPrivateKeyRefrenceFromData: p12Data password: p12Password]; }
#pragma mark - 私有调用方法 -(SecKeyRef) getPublicKeyRefrenceFromeData: (NSData*)derData { SecCertificateRef myCertificate = SecCertificateCreateWithData(kCFAllocatorDefault, (__bridge CFDataRef)derData); SecPolicyRef myPolicy = SecPolicyCreateBasicX509(); SecTrustRef myTrust; OSStatus status = SecTrustCreateWithCertificates(myCertificate,myPolicy,&myTrust); SecTrustResultType trustResult; if (status == noErr) { status = SecTrustEvaluate(myTrust, &trustResult); } SecKeyRef securityKey = SecTrustCopyPublicKey(myTrust); CFRelease(myCertificate); CFRelease(myPolicy); CFRelease(myTrust); return securityKey; } -(SecKeyRef) getPrivateKeyRefrenceFromData: (NSData*)p12Data password:(NSString*)password { 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; }
#pragma mark - 加密 -(NSString*) rsaEncryptString:(NSString*)string { NSData* data = [string dataUsingEncoding:NSUTF8StringEncoding]; NSData* encryptedData = [self rsaEncryptData: data]; NSString* base64EncryptedString = [encryptedData base64EncodedStringWithOptions:0]; return base64EncryptedString; } // 加密的大小受限于SecKeyEncrypt函数,SecKeyEncrypt要求明文和密钥的长度一致,如果要加密更长的内容,需要把内容按密钥长度分成多份,然后多次调用SecKeyEncrypt来实现 -(NSData*) rsaEncryptData:(NSData*)data { SecKeyRef key = [self getPublicKey]; size_t cipherBufferSize = SecKeyGetBlockSize(key); uint8_t *cipherBuffer = malloc(cipherBufferSize * sizeof(uint8_t)); size_t blockSize = cipherBufferSize - 11; // 分段加密 size_t blockCount = (size_t)ceil([data length] / (double)blockSize); NSMutableData *encryptedData = [[NSMutableData alloc] init] ; for (int i=0; i<blockCount; i++) { long bufferSize = MIN(blockSize,[data length] - i * blockSize); NSData *buffer = [data subdataWithRange:NSMakeRange(i * blockSize, bufferSize)]; OSStatus status = SecKeyEncrypt(key, kSecPaddingPKCS1, (const uint8_t *)[buffer bytes], [buffer length], cipherBuffer, &cipherBufferSize); if (status == noErr){ NSData *encryptedBytes = [[NSData alloc] initWithBytes:(const void *)cipherBuffer length:cipherBufferSize]; [encryptedData appendData:encryptedBytes]; }else{ if (cipherBuffer) { free(cipherBuffer); } return nil; } } if (cipherBuffer){ free(cipherBuffer); } return encryptedData; }
#pragma mark - 解密部分 -(NSString*) rsaDecryptString:(NSString*)string { NSData* data = [[NSData alloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters]; NSData* decryptData = [self rsaDecryptData: data]; NSString* result = [[NSString alloc] initWithData: decryptData encoding:NSUTF8StringEncoding]; return result; } -(NSData*) rsaDecryptData:(NSData*)data { SecKeyRef key = [self getPrivateKey]; size_t cipherLen = [data length]; void *cipher = malloc(cipherLen); [data getBytes:cipher length:cipherLen]; size_t plainLen = SecKeyGetBlockSize(key) - 12; void *plain = malloc(plainLen); OSStatus status = SecKeyDecrypt(key, kSecPaddingPKCS1, cipher, cipherLen, plain, &plainLen); if (status != noErr) { return nil; } NSData *decryptedData = [[NSData alloc] initWithBytes:(const void *)plain length:plainLen]; return decryptedData; } #pragma marke - verify file SHA1 -(BOOL) rsaSHA1VerifyData:(NSData *) plainData withSignature:(NSData *) signature { size_t signedHashBytesSize = SecKeyGetBlockSize([self getPublicKey]); const void* signedHashBytes = [signature bytes]; size_t hashBytesSize = CC_SHA1_DIGEST_LENGTH; uint8_t* hashBytes = malloc(hashBytesSize); if (!CC_SHA1([plainData bytes], (CC_LONG)[plainData length], hashBytes)) { return NO; } OSStatus status = SecKeyRawVerify(publicKey,kSecPaddingPKCS1SHA1,hashBytes,hashBytesSize,signedHashBytes,signedHashBytesSize); return status == errSecSuccess; }
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