在iOS中使用X.509 2048位公钥encryption

在我的iOS库中，我有一个包含X.509 RSA 2048位公钥的Base64编码的string。 我想用这个公钥encryption一个string。 任何人都可以提供一些目标C代码参考，提到我需要包括的库？

等效的Java代码如下所示：

byte[] keyBytes = Base64.decodeBase64(publicKeyData); // Get Public Key X509EncodedKeySpec rsaPublicKeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory fact = KeyFactory.getInstance("RSA"); PublicKey publicKey = fact.generatePublic(rsaPublicKeySpec); Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); encryptedData = cipher.doFinal(dataToEncrypt); 

Answer 1

试试这个代码：

 // publicKeyBase64 is your public key string NSData *publicKeyFileContent = [[NSData alloc] initWithBase64EncodedString:publicKeyBase64 options:0]; // get your public key SecCertificateRef cert = SecCertificateCreateWithData(kCFAllocatorDefault, (__bridge CFDataRef)publicKeyFileContent); SecPolicyRef policy = SecPolicyCreateBasicX509(); SecTrustRef trust; OSStatus status = SecTrustCreateWithCertificates(cert, policy, &trust); SecTrustResultType trustResult; if (status == noErr) { status = SecTrustEvaluate(trust, &trustResult); } SecKeyRef keyRef = SecTrustCopyPublicKey(trust); // encrypt your data // with this code you can encrypt only one block // if you need to encrypt more data you need to use some chunking logic const uint8_t *srcbuf = (const uint8_t *)[data bytes]; size_t srclen = (size_t)data.length; size_t outlen = SecKeyGetBlockSize(keyRef) * sizeof(uint8_t); if(srclen > outlen - 11){ CFRelease(keyRef); return nil; } void *outbuf = malloc(outlen); OSStatus status = noErr; status = SecKeyEncrypt(keyRef, kSecPaddingPKCS1, srcbuf, srclen, outbuf, &outlen ); NSData *ret = nil; if (status != 0) { NSLog(@"SecKeyEncrypt fail. Error Code: %ld", status); }else{ ret = [NSData dataWithBytes:outbuf length:outlen]; } free(outbuf); CFRelease(cert); CFRelease(policy); CFRelease(trust); CFRelease(keyRef); // your encrypted data is in ret