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https://github.com/fumiama/aes-rsa-tcp-demo
C/S demo with RSA and AES Algorithm
https://github.com/fumiama/aes-rsa-tcp-demo
aes aes-cipher aes-encryption demo golang golang-cli golang-examples golang-server rsa rsa-cryptography rsa-cryptosystem rsa-key rsa-key-pair rsa-signature socket socket-io tcp tcp-client tcp-server
Last synced: about 1 month ago
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C/S demo with RSA and AES Algorithm
- Host: GitHub
- URL: https://github.com/fumiama/aes-rsa-tcp-demo
- Owner: fumiama
- Created: 2023-12-29T07:29:55.000Z (11 months ago)
- Default Branch: main
- Last Pushed: 2023-12-29T07:37:58.000Z (11 months ago)
- Last Synced: 2024-09-29T21:21:02.470Z (about 2 months ago)
- Topics: aes, aes-cipher, aes-encryption, demo, golang, golang-cli, golang-examples, golang-server, rsa, rsa-cryptography, rsa-cryptosystem, rsa-key, rsa-key-pair, rsa-signature, socket, socket-io, tcp, tcp-client, tcp-server
- Language: Go
- Homepage:
- Size: 11.7 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# C/S demo with RSA and AES Algorithm
This program is my homework for the IoT course, demonstrating the use of symmetric encryption AES and asymmetric encryption RSA.
## Communication Process
### Server
1. Create a socket and listen for TCP connections.
2. Upon receiving a connection, perform corresponding operations based on the client's request:
- `utils.PacketTypeInit`: Encrypt its own RSA public key with the pre-shared AES key and send it to the client.
- `utils.PacketTypeComm`: Decrypt and print the message sent by the client using `RSA-OAEP` with the private key, then encrypt its replyment with a **self-made** signature algorithm using the RSA private key and send it.
3. When the client actively disconnects, one processing ends.
### Client
1. Establish a TCP connection to the server address.
2. Send a `utils.PacketTypeInit` packet to the server to request the RSA key.
3. Continuously send `Hello` to the server using `EncryptOAEP` while decrypting and printing the message sent by server with its public key using the **self-made** signature algorithm.
4. When the user manually terminates, close the connection to the server.
## Packet Protocol
The overall encapsulation is defined in [utils/packet.go](utils/packet.go).
```
0 15 23
┌─────────┬────┬──────────────┐
│ len │type│ ... data ... │
└─────────┴────┴──────────────┘
```
### len
The length of the packet without itself.
### type
Defined in [utils/packet.go](utils/packet.go).
```go
const (
PacketTypeInit PacketType = iota // PacketTypeInit pass RSA pubkey by AES pre-shared key
PacketTypeComm // PacketTypeComm normal communication
PacketTypeTop // PacketTypeTop for valid checking
)
```
### data
The payload, whose type is described by the `type` field.
#### PacketTypeInit
Defined in [utils/packet_init.go](utils/packet_init.go).
```
0 7 23 87
┌────┬────────┬─────────────────┬──────────────────────┐
│type│ length │ pub key crc64 │ x509rsapubkey │
└────┴────────┴─────────────────┴──────────────────────┘
```
- **type**: `PacketInitTypeReq` or `PacketInitTypeAck`
- **length**: length of `x509rsapubkey`
#### PacketTypeComm
The whole data field is encrypted by RSA and can fill in with any data, which is plain text in this demo.
## Interesting Points
### The Implementation of [Base16384](https://github.com/fumiama/base16384)
Base16384 is a base64-like algorithm designed by me. It can encode binary file to printable utf16be, and vice versa.
In this demo, the [RSA Private Key](rsa_2048_private_x509.b14) and AES key is saved and passed by base16384 format.
### The Usage of Raw RSA Encrypting Method
In the file [utils/rsa.go](utils/rsa.go), I use `go:linkname` to hook the private function of `crypto/rsa` library and realized a **self-made** signature algorithm that can get the decoding result but not just verify whether it is valid (unlike the official method `rsa.VerifyPKCS1v15`).
## Demo
See the video below.
https://github.com/fumiama/aes-rsa-tcp-demo/assets/41315874/e4f6522b-e147-4a2f-add3-3a2abb90e96b