c rsa java_通过网络将RSA公钥从C发送到Java

旧城等待， 2022-11-03 05:45 23阅读 0赞

我试图通过网络发送RSA公钥,从用c编写的服务器发送到用

Java编写的客户端.当客户端收到模数时,它应该使用模数和服务器也在使用的公共指数F4重新创建RSA密钥.

以下是服务器生成和发送密钥的方式：

//Generate RSA key in C

RSA \*rsa;

int bits = 1024;

unsigned long exp = RSA\_F4;

BIGNUM \*bn;

BIGNUM \*MyModPubKey;

bn = BN\_new();

BN\_set\_word(bn, exp);

rsa = RSA\_new();

RSA\_generate\_key\_ex(rsa, bits, bn, NULL);

MyModPubKey = rsa->n;

//Send RSA modulus in C

unsigned char public\_key\_Mod\[128\];

unsigned char \*PubMod;

int PubModLen;

PubMod = (unsigned char \*)&public\_key\_Mod;

PubModLen = BN\_bn2bin(MyModPubKey, PubMod);

assert(PubModLen == 128);

send(sd, public\_key\_Mod, 128, 0);

以下是如何在Java中重新创建密钥.省略了异常处理.

//Read the modulus

byte\[\] public\_key\_mod = new byte\[128\];

is.read(public\_key\_mod, 0, 128);

//Create BigInteger modulus and exponent

BigInteger RxPubKeyMod = new BigInteger(1, public\_key\_mod);

BigInteger RxPubKeyExp = RSAKeyGenParameterSpec.F4;

PublicKey RxRsaPubKey = KeyFactory.getInstance("RSA").generatePublic(

new RSAPublicKeySpec(RxPubKeyMod, RxPubKeyExp));

但是,Java中生成的公共RSA密钥与C中的密钥不同.通过打印base64编码的密钥版本验证.

我还在两端打印模数和指数,并验证它们是否相同.这是怎么做到的：

//Java

System.out.println("RxPubKeyExp: " + RxPubKeyExp.toString(16));

System.out.println("RxPubKeyMod: " + RxPubKeyMod.toString(16));

//C

printf("PubKeyExp %s \\n", BN\_bn2hex(MyModPubKey->e));

printf("PubKeyMod %s \\n", BN\_bn2hex(MyModPubKey->n));

他们是一样的.

我无法弄清楚为什么这不起作用.我错过了一些重要的事情.复杂因素是我有一个C版本的客户端,它可以正确地重新创建从服务器收到的信息.它可能是BigInteger用Java签名的东西,但我也尝试插入额外的前导0x00并将bytearray扩展为129字节,结果相同(生成相同的密钥).

拜托,我完全卡住了.

谢谢

更新：

以下是C服务器的示例输出：

PubKeyExp 010001

PubKeyMod A8CB09C2B84762A8C822F18C9CA48036E0D9988C9D8625BF5F2DF16FDEEC92D018863E129C0AE89EB0C344FD32DFF419548C39BB41A867293BC4BD84A1ECAEB0D723EEA97BD2651AF8BD56B2C97D38A39111A0C48894BC034371C2EDB96F1E2E9CDDA9B16DFBE80580ADFDA3853445120F7429AD60300E31254864041210B0BB

PublicKey -----BEGIN RSA PUBLIC KEY-----

MIGJAoGBAKjLCcK4R2KoyCLxjJykgDbg2ZiMnYYlv18t8W/e7JLQGIY+EpwK6J6w

w0T9Mt/0GVSMObtBqGcpO8S9hKHsrrDXI+6pe9JlGvi9VrLJfTijkRGgxIiUvAND

ccLtuW8eLpzdqbFt++gFgK39o4U0RRIPdCmtYDAOMSVIZAQSELC7AgMBAAE=

\-----END RSA PUBLIC KEY-----

它以这种方式打印：

printf("PubKeyExp %s \\n", BN\_bn2hex(MyModPubKey->e));

printf("PubKeyMod %s \\n", BN\_bn2hex(MyModPubKey->n));

FILE \*fp;

char \*pubKeyString;

pubKeyString = calloc(1, 512);

if(!(fp = fmemopen(pubKeyString, 512, "w"))) \{

exit(1);

PEM\_write\_RSAPublicKey(fp, pubKey);

fflush(fp);

fclose(fp);

printf("PublicKey %s \\n",pubKeyString);

其中pubKey = rsa如上所述

以下是Java服务器的示例输出：

RxPubKeyExp: 10001

RxPubKeyMod: a8cb09c2b84762a8c822f18c9ca48036e0d9988c9d8625bf5f2df16fdeec92d018863e129c0ae89eb0c344fd32dff419548c39bb41a867293bc4bd84a1ecaeb0d723eea97bd2651af8bd56b2c97d38a39111a0c48894bc034371c2edb96f1e2e9cdda9b16dfbe80580adfda3853445120f7429ad60300e31254864041210b0bb

RxRsaPubKey: MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCoywnCuEdiqMgi8YycpIA24NmYjJ2GJb9fLfFv3uyS0BiGPhKcCuiesMNE/TLf9BlUjDm7QahnKTvEvYSh7K6w1yPuqXvSZRr4vVayyX04o5ERoMSIlLwDQ3HC7blvHi6c3amxbfvoBYCt/aOFNEUSD3QprWAwDjElSGQEEhCwuwIDAQAB

它以这种方式打印：

System.out.println("RxPubKeyExp: " + RxPubKeyExp.toString(16));

System.out.println("RxPubKeyMod: " + RxPubKeyMod.toString(16));

String RxRsaPubKeyChar = Base64.encodeToString(RxRsaPubKey.getEncoded(), Base64.DEFAULT);

System.out.println("RxRsaPubKey: " + RxRsaPubKeyChar);