ios - RSA 用Security.framwork解密问题-PHP Chinese Network Q&A

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ios - RSA 用Security.framwork解密问题

PHP中文网 2017-04-17 16:26:52

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我用RSA的public key来解密，php那边用private key来加密，用的Security.framework来解密。但是解出来的数据前面多了一小串奇怪的乱码，后面数据是正确的。谁能帮我看看哪里有问题？

- (NSData *)decryptToDataWithPublicKey: (NSData *)dataToDecrypt { NSData *wrappedSymmetricKey = dataToDecrypt; SecKeyRef key = self.publicKey;//这是之前已经成功使用的SecKeyRef size_t cipherBufferSize = SecKeyGetBlockSize(key); size_t keyBufferSize = [wrappedSymmetricKey length]; NSMutableData *bits = [NSMutableData dataWithLength:keyBufferSize]; __unused OSStatus sanityCheck = SecKeyDecrypt(key, kSecPaddingNone, (const uint8_t *) [wrappedSymmetricKey bytes], cipherBufferSize, [bits mutableBytes], &keyBufferSize); [bits setLength:keyBufferSize]; return [bits copy]; }

最后的数据前面多了一堆fffff，不知道哪里出了问题..
f结束后的数据是正确的。

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大家讲道理2017-04-17 16:28:52 2 floor

Ask and answer your own questions. In the end, this method still did not find a solution, and was finally abandoned. Instead, we used the feature of OC to be compatible with C, poured it into the openssl framework, and used openssl functions to decrypt.Security.framework

- (NSString *)decryptToDataWithPublicKey: (NSString *)dataToDecrypt { NSData *contentData = [dataToDecrypt base64DecodedData]; unsigned char *decrypted = (unsigned char *)malloc(rsa_public_len - 1); char *err = NULL; if (RSA_public_decrypt([contentData length], [contentData bytes], decrypted, rsa_publicKey, RSA_NO_PADDING) == -1) { ERR_load_CRYPTO_strings(); fprintf(stderr, "Error %s\n", ERR_error_string(ERR_get_error(), err)); fprintf(stderr, "Error %s\n", err); return nil; } RSA_free(rsa_publicKey); NSString *str = [NSString stringWithUTF8String:(char *) decrypted]; return str; }