RSA SHA256登录iOS并在Java上进行验证 [英] RSA SHA256 signing in iOS and verification on Java

问题描述

1. 我用SecKeyGeneratePair生成了一个RSA密钥对.密钥大小(以位为单位)为2048.

1. I generated an RSA key pair with SecKeyGeneratePair. The key size in bits is 2048.

NSDictionary *privateAttributes = @{(NSString *)kSecAttrIsPermanent: @YES, (NSString *)kSecAttrApplicationTag: PrivTag};
NSDictionary *publicAttributes = @{(NSString *)kSecAttrIsPermanent: @YES, (NSString *)kSecAttrApplicationTag: PubTag};

NSDictionary *pairAttributes = @{(NSString *)kSecAttrKeyType: (NSString *)kSecAttrKeyTypeRSA, (NSString *)kSecAttrKeySizeInBits: @2048, (NSString *)kSecPublicKeyAttrs: publicAttributes, (NSString *)kSecPrivateKeyAttrs: privateAttributes};

SecKeyRef publicKeyRef;
SecKeyRef privateKeyRef;
OSStatus osStatus = SecKeyGeneratePair((CFDictionaryRef)pairAttributes, &publicKeyRef, &privateKeyRef);
switch (osStatus) {
case noErr:
    break;
default:
    break;
}

创建公钥的X.509格式并将其发送到服务器.

Create the X.509 format of the public key and send it to the server.

使用CC_SHA256创建自定义字符串的SHA256摘要.

Create the SHA256 digest of the custom string with CC_SHA256.

NSMutableData *hash = [NSMutableData dataWithLength:(NSUInteger)CC_SHA256_DIGEST_LENGTH];
NSData *data = [stringToSign dataUsingEncoding:NSUTF8StringEncoding];
CC_SHA256(data.bytes, (CC_LONG)data.length, hash.mutableBytes);

使用kSecPaddingPKCS1SHA256的SecKeyRawSign方法对字符串进行签名.

Sign the string with SecKeyRawSign method using kSecPaddingPKCS1SHA256.

// Sign the hash with the private key
size_t blockSize = SecKeyGetBlockSize(privateKeyRef);

NSUInteger hashDataLength = hash.length;
const unsigned char *hashData = (const unsigned char *)hash.bytes;

NSMutableData *result = [NSMutableData dataWithLength:blockSize];

uint8_t *signedHashBytes = malloc(blockSize * sizeof(uint8_t));
memset((void *) signedHashBytes, 0x0, blockSize);
size_t encryptedDataLength = blockSize;

OSStatus status = SecKeyRawSign(privateKeyRef, kSecPaddingPKCS1SHA256, hashData, hashDataLength, signedHashBytes, &encryptedDataLength);

NSData *signedHash = [NSData dataWithBytes:(const void *) signedHashBytes length:(NSUInteger) encryptedDataLength];

在签名的数据上应用base64并将其发送到服务器.

Apply base64 on the signed data and send it to the server.

我在Swift中有相同的上述代码. 作为调试步骤，我也导出了我的私钥，并尝试遵循Java中完全相同的步骤.在第3步之前，所有操作都是相同的.因此，iOS创建与Java应用程序相同的摘要.第四步，签名创建与Java代码不同的输出.

I have the same above code in Swift. As a debug step, I've exported my private key too and tried to follow the exact same steps in java. Until step 3 everything is the same. So, the iOS creates the same digest as the java app. The fourth step, the signing creates a different output than the java code.

这是Java代码:

final Signature instance = Signature.getInstance("SHA256withRSA");
instance.initSign(privateKey);
instance.update(MessageDigest.getInstance("SHA-256").digest(rawString.toString().getBytes("UTF-8")));

推荐答案

iOS和Java的数字签名API不同，但结果相同.

Digital signature API for iOS and Java is different but the result is the same.

iOS SecKeyRawSign使用SHA256摘要，但是在Java中，Signature.sign需要原始数据，并且使摘要+ pkcs1.使用

iOS SecKeyRawSign with kSecPaddingPKCS1SHA256 uses a SHA256 digest, but in Java Signature.sign requires the raw data and it makes digest+pkcs1. Use

instance.update(rawString.toString().getBytes("UTF-8"));

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