OpenSSL RSA加解密 (.Net公钥加密/ Linux端私钥解密)

要求在.Net端生成公钥私钥对。

然后在.Net端使用RSA公钥加密；在Linux端使用RSA私钥解密。

最初的尝试是：.Net端使用RSACryptoServiceProvider; Linux端使用OpenSSL

搞了整整5个小时，有木有啊，有木有啊！ .Net的RSA和OpenSSL对不上，有木有啊，有木有啊!

人都搞晕了就是对不上。最后解决方式换成了，.Net端使用 OpenSSL.Net.

.Net端代码

        string publicKeyFile = context.Server.MapPath("~/App_Data/public.pem");
        using( RSA rsa = RSA.FromPublicKey(BIO.File(publicKeyFile, "r")) )
        {
            buffer = rsa.PublicEncrypt( buffer, RSA.Padding.OAEP);
            encryptedKey = Convert.ToBase64String(buffer);
        }

Linux端代码

BIO *b64, *bmem;

// Base64解码
unsigned char *buffer = (unsigned char *)malloc(length);
memset(buffer, 0, length);

b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
bmem = BIO_new_mem_buf(szKey, length);
bmem = BIO_push(b64, bmem);
int len = BIO_read(bmem, buffer, length);
BIO_free_all(bmem);


// 加载私钥
BIO * key = NULL; 
RSA * r = NULL; 
key = BIO_new(BIO_s_file()); 
BIO_read_filename(key,  "/val/XXX/private.pem" ); 
r = PEM_read_bio_RSAPrivateKey(key, NULL, NULL, NULL); 
BIO_free_all(key);


unsigned char * plainText = (unsigned char *)malloc(len);
memset( plainText, 0, len);

// 解密
int ret = RSA_private_decrypt( RSA_size(r), buffer, plainText, r, RSA_PKCS1_OAEP_PADDING);
RSA_free(r);


free(plainText);
free(buffer);