Welcome to our journey with CROK.PRO

A tribute to low-level programming mastery. Explore how we deployed a token entirely in raw assembly language.

Resources

Find the complete assembly script and detailed instructions on our GitHub repository.

Future Tools

We are building a deployer tool that will allow you to create your own tokens in raw assembly language. Sign up to the whitelist to be part of the action!

Stay tuned!

Documentation

Here’s how we generated a Solana wallet using a low-level assembly-inspired approach:

Step 1: Tools and Libraries

We used the following tools and libraries:

Libsodium: A cryptography library for key pair generation. (Download here)
MinGW-w64: GCC compiler for Windows. (Download here)
7-Zip: For extracting compressed files. (Download here)

Step 2: Extracting and Setting Up

We extracted the downloaded files into our Documents folder and ensured the paths were set correctly in our environment variables.

Step 3: Writing the Code

Below is the C code we used to generate the wallet:

#include 
#include 

int main() {
    if (sodium_init() == -1) {
        return 1;
    }

    unsigned char seed[crypto_sign_SEEDBYTES];
    randombytes_buf(seed, sizeof(seed));

    unsigned char pk[crypto_sign_PUBLICKEYBYTES];
    unsigned char sk[crypto_sign_SECRETKEYBYTES];

    crypto_sign_seed_keypair(pk, sk, seed);

    printf("Public Key: ");
    for (int i = 0; i < crypto_sign_PUBLICKEYBYTES; i++) {
        printf("%02x", pk[i]);
    }
    printf("\nPrivate Key: ");
    for (int i = 0; i < crypto_sign_SECRETKEYBYTES; i++) {
        printf("%02x", sk[i]);
    }
    printf("\n");

    return 0;
}

Step 4: Compiling the Code

Use the following command to compile the program:


gcc -o generate_wallet generate_wallet.c -IC:\Users\User\Documents\libsodium\libsodium-win64\include -LC:\Users\User\Documents\libsodium\libsodium-win64\lib -lsodium

Step 5: Running the Program

We ran the program to generate our public and private keys:

Generating and Uploading Token Metadata

We wrote an assembly program to upload token metadata to a server and display the token metadata on the console. This program makes use of system calls to perform network communication and console output directly from the x86_64 architecture.

section .data
    api_url db "https://pump.fun/api/ipfs", 0
    metadata_json db "{\"name\":\"MyToken\",\"symbol\":\"MTK\",\"description\":\"My custom token\",\"twitter\":\"https://twitter.com/MyToken\",\"telegram\":\"https://t.me/MyTokenGroup\",\"website\":\"https://mytoken.io\"}", 0
    image_path db "example.png", 0
    user_agent db "User-Agent: AssemblyTechClient/1.0", 0
    success_msg db "Metadata uploaded successfully!", 0xA, 0
    url_prefix db "Extracted URL: ", 0
    response_buffer times 1024 db 0

section .bss
    bytes_written resb 8
    file_descriptor resb 4

section .text
extern printf
extern curl_easy_init
extern curl_easy_setopt
extern curl_easy_perform
extern curl_easy_cleanup
global _start

_start:
    ; Initialize CURL
    call curl_easy_init
    mov r12, rax  ; Save CURL handle

    ; Set CURL options
    mov rcx, r12
    lea rdx, [rel api_url]
    mov r8, 0x10002  ; CURLOPT_URL
    call curl_easy_setopt

    lea rdx, [rel metadata_json]
    mov r8, 0x10022  ; CURLOPT_POSTFIELDS
    call curl_easy_setopt

    ; Perform CURL request
    mov rcx, r12
    call curl_easy_perform

    ; Print success message
    lea rdi, [rel success_msg]
    xor rax, rax
    call printf

    ; Extract URL from response buffer
    lea rdi, [rel url_prefix]
    xor rax, rax
    call printf

    ; Cleanup and exit
    mov rcx, r12
    call curl_easy_cleanup

    ; Exit program
    mov rax, 60   ; Exit system call
    xor rdi, rdi  ; Exit code 0
    syscall

Step 6: Sending Transaction Details to PumpPortal.fun

After generating the metadata URI, our next step was to send the transaction details to the PumpPortal.fun API. This step generates an unsigned transaction, which will be signed locally in the next step.

section .data
    api_url db "https://pumpportal.fun/api/trade-local", 0
    json_body db "{\"publicKey\":\"\",\"action\":\"create\",\"tokenMetadata\":{\"name\":\"ExampleToken\",\"symbol\":\"EXMPL\",\"uri\":\"\"},\"mint\":\"\",\"denominatedInSol\":\"true\",\"amount\":\"0.100\",\"slippage\":10,\"priorityFee\":\"0.00010\",\"pool\":\"pump\"}", 0
    user_agent db "User-Agent: AssemblyTechClient/1.0", 0
    content_type db "Content-Type: application/json", 0
    response_buffer times 4096 db 0
    response_end db 0

section .bss
    curl_handle resq 1

section .text
extern printf
extern curl_easy_init
extern curl_easy_setopt
extern curl_easy_perform
extern curl_easy_cleanup
global _start

_start:
    ; Initialize CURL
    call curl_easy_init
    mov rdi, rax
    mov [curl_handle], rdi

    ; Set URL
    mov rdi, [curl_handle]
    lea rsi, [rel api_url]
    mov rdx, 0x10002  ; CURLOPT_URL
    call curl_easy_setopt

    ; Set POST data
    lea rsi, [rel json_body]
    mov rdx, 0x10022  ; CURLOPT_POSTFIELDS
    call curl_easy_setopt

    ; Set headers
    lea rsi, [rel user_agent]
    mov rdx, 0x10012  ; CURLOPT_USERAGENT
    call curl_easy_setopt

    lea rsi, [rel content_type]
    mov rdx, 0x1003A  ; CURLOPT_HTTPHEADER
    call curl_easy_setopt

    ; Set response buffer
    lea rsi, [rel response_buffer]
    mov rdx, 0x1001D  ; CURLOPT_WRITEDATA
    call curl_easy_setopt

    ; Perform the request
    mov rdi, [curl_handle]
    call curl_easy_perform

    ; Print response
    lea rdi, [rel response_buffer]
    xor rax, rax
    call printf

    ; Cleanup CURL
    mov rdi, [curl_handle]
    call curl_easy_cleanup

    ; Exit
    mov rax, 60  ; Exit syscall
    xor rdi, rdi
    syscall

The response from the API contains the unsigned transaction in Base58 format. We saved this response for the signing process in the next step. Unsigned Transactions Screenshot

Step 7: Signing the Transaction Locally

While working with assembly scripts to sign transactions, we encountered limitations due to the lack of libraries and efficient tooling for cryptographic operations. To overcome this, we developed a hybrid approach using a C script supported by a Rust script for handling the signing process. Below is the detailed explanation and implementation:

C Script: signer.c

The C script dynamically loads a Rust DLL for signing and forwards the signed transaction to the Helius RPC.

#include 
#include 
#include 
#include 
#include 

#define HELIUS_RPC_URL "https://rpc.helius.xyz/v1/your-api-key"
#define AUTH_HEADER "Authorization: your-api-key"

void send_transactions() {
    // ... Include the relevant logic from signer.c here
}

int main() {
    send_transactions();
    return 0;
}

Rust Script: lib.rs

The Rust script provides the necessary cryptographic functions for signing transactions.

use solana_sdk::{
    signature::{Keypair, Signer},
    transaction::VersionedTransaction,
    message::VersionedMessage,
};
use std::ffi::{CStr, CString};
use bs58;
use bincode;

#[no_mangle]
pub extern "C" fn sign_transaction(
    tx_data: *const u8,
    tx_len: usize,
    mint_private_key_base58: *const i8,
    creator_private_key_base58: *const i8,
) -> *mut i8 {
    // Rust implementation
}

Compilation Steps

Before using the `signer.c` script, you need to compile the Rust project to generate the necessary DLL file:

Navigate to the Rust project's root directory and build it into a DLL: cargo build --release --target x86_64-pc-windows-gnu
Copy the generated DLL file (solana_sdk_wrapper.dll) from the target/release directory to the same directory as your `signer.c` executable.
Compile the `signer.c` script with the following command: gcc -o signer signer.c -L. -lsolana_sdk_wrapper

After signing, the transaction will be ready for submission to the blockchain. The signed transaction in Base58 format will look something like this:

3B98p3...SignedTransactionEncoded

Save the signed transaction for the next step: submitting it to the blockchain.

Step 8: Submitting the Transaction to Jito API

The final step was sending our signed transaction to the Jito API for validation and inclusion in a Solana block. This step ensures the transaction is broadcast to the network securely and efficiently.

Understanding the Process:

Jito API: A high-performance API designed for submitting Solana transactions with low latency.
Transaction Hash: The response from the Jito API includes a transaction hash, which can be used to track the transaction on Solscan.

section .data
    jito_api_url db "https://mainnet.block-engine.jito.wtf/api/v1/bundles", 0
    signed_txn db "base58_encoded_signed_transaction", 0
    json_body_template db "{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"sendBundle\",\"params\":[[\"", 0
    json_body_end db "\"]]}", 0
    complete_json_body times 1024 db 0
    response_buffer times 4096 db 0

section .bss
    curl_handle resq 1

section .text
extern strcat
extern printf
extern curl_easy_init
extern curl_easy_setopt
extern curl_easy_perform
extern curl_easy_cleanup
global _start

_start:
    ; Build JSON body
    lea rdi, [rel complete_json_body]
    lea rsi, [rel json_body_template]
    call strcat
    lea rsi, [rel signed_txn]
    call strcat
    lea rsi, [rel json_body_end]
    call strcat

    ; Initialize CURL
    call curl_easy_init
    mov rdi, rax
    mov [curl_handle], rdi

    ; Set URL
    mov rdi, [curl_handle]
    lea rsi, [rel jito_api_url]
    mov rdx, 0x10002  ; CURLOPT_URL
    call curl_easy_setopt

    ; Set POST data
    lea rsi, [rel complete_json_body]
    mov rdx, 0x10022  ; CURLOPT_POSTFIELDS
    call curl_easy_setopt

    ; Perform the request
    mov rdi, [curl_handle]
    call curl_easy_perform

    ; Print response
    lea rdi, [rel response_buffer]
    xor rax, rax
    call printf

    ; Cleanup and exit
    mov rdi, [curl_handle]
    call curl_easy_cleanup

    mov rax, 60  ; Exit syscall
    xor rdi, rdi
    syscall

After submission, the Jito API returns a transaction hash. Use this hash to track the transaction on Solscan. For example:

https://solscan.io/tx/?cluster=mainnet-beta

With this, our transaction lifecycle was complete, and our token was successfully deployed on the Solana blockchain!