libreddit-ndk.so - decryptSigningKey

README.md

libreddit-ndk.so

I got bored.. I've included both a C++ version & Python version.

Very easy.. int64_t Java_com_reddit_auth_login_common_util_KeyUtil_decryptSigningKey(int64_t* arg1) key & map

main.cpp

#include <cstdint>
#include <memory>
#include <algorithm>
#include <iostream>

unsigned char map[] = {
    0xd1, 0x09, 0xcb, 0x63, 0x16, 0x34, 0x23, 0xe6, 0xcf, 0x90, 0xf1, 0x18, 0x2d, 0xb9, 0x0f, 0x2c,
    0xb5, 0x00, 0x8a, 0x1d, 0xf2, 0x06, 0x9b, 0x51, 0xd6, 0xa4, 0x65, 0x3e, 0xd5, 0xac, 0x07, 0x54,
    0x6e, 0xad, 0x76, 0x69, 0x40, 0x88, 0x72, 0x95, 0x98, 0x1f, 0xf8, 0x59, 0xea, 0x6f, 0x50, 0xa3,
    0x12, 0x55, 0x87, 0x70, 0xc2, 0xd4, 0x01, 0x78, 0x10, 0x61, 0x84, 0x5d, 0xd0, 0x82, 0x4c, 0x03,
    0x17, 0xc0, 0xf5, 0xf3, 0x5f, 0xa5, 0x42, 0x97, 0x31, 0x2a, 0xa8, 0x47, 0x5c, 0x4d, 0x93, 0x02,
    0x24, 0x64, 0x30, 0x8d, 0x21, 0xc1, 0x2b, 0xe8, 0x53, 0x83, 0x85, 0x49, 0xa2, 0x11, 0x37, 0xbe,
    0x48, 0xb6, 0xf6, 0x9e, 0x26, 0x35, 0x04, 0x0e, 0x67, 0x6b, 0xc3, 0xd9, 0xdd, 0x9f, 0xeb, 0x14,
    0x7e, 0xba, 0x73, 0x80, 0xb8, 0xbd, 0xfa, 0xca, 0x77, 0xd7, 0xc8, 0x75, 0xe2, 0xbb, 0xe3, 0x1c,
    0x96, 0x36, 0xa9, 0x0d, 0xaa, 0x3f, 0xc7, 0xb1, 0x62, 0x38, 0x0b, 0xfc, 0xa0, 0x27, 0x7b, 0xb2,
    0xe5, 0xfb, 0xc9, 0x15, 0x71, 0xf4, 0x1b, 0xfe, 0x44, 0x2e, 0x5a, 0x79, 0xa7, 0x19, 0xfd, 0x3b,
    0x8b, 0x22, 0xa1, 0xec, 0xdf, 0x66, 0x4a, 0xed, 0x20, 0x86, 0x3d, 0x6c, 0x5e, 0x99, 0x43, 0xaf,
    0xe1, 0x0a, 0xef, 0xd3, 0x13, 0xde, 0x94, 0x68, 0xb4, 0xcd, 0x6a, 0xdc, 0xff, 0x3c, 0x7d, 0xe7,
    0x91, 0x29, 0x25, 0xc5, 0x33, 0x6d, 0x7a, 0x39, 0xe4, 0x3a, 0x4f, 0x1e, 0xdb, 0x41, 0x56, 0x4e,
    0x9c, 0x81, 0xe9, 0xb7, 0xbf, 0xe0, 0x9a, 0x52, 0xc4, 0x8c, 0x7f, 0x0c, 0x57, 0x2f, 0xab, 0x74,
    0x1a, 0x92, 0x45, 0x46, 0xce, 0x4b, 0xbc, 0xf0, 0x89, 0xf9, 0xb0, 0xb3, 0xd2, 0x58, 0x08, 0xcc,
    0xd8, 0xc6, 0xda, 0x32, 0xa6, 0x28, 0xee, 0x5b, 0x8f, 0x05, 0xae, 0x9d, 0x60, 0x8e, 0xf7, 0x7c
};

unsigned char key[] = {
    0x89, 0x03, 0x5e, 0x39, 0x88, 0x39, 0x39, 0x65, 0xa5, 0xc7, 0x52, 0x65, 0xa5, 0x5e, 0x52, 0x05,
    0x52, 0x52, 0x03, 0x89, 0x48, 0x88, 0xa5, 0xc4, 0x39, 0x48, 0x39, 0x48, 0x52, 0x48, 0x1a, 0x5e,
    0x65, 0xa5, 0x5e, 0xf3, 0x48, 0x52, 0x48, 0x52, 0x05, 0x88, 0x48, 0xc7, 0xc7, 0x48, 0xa5, 0x52,
    0x03, 0x51, 0x65, 0xf3, 0x05, 0x52, 0x39, 0x39, 0x89, 0x52, 0x03, 0x05, 0x51, 0xc7, 0xc7, 0x51,
    0x11
};


std::unique_ptr<char[]> decryptSigningKey()
{
    constexpr size_t outputSize = 66;
    auto out = std::make_unique<char[]>(outputSize);

    std::transform(key, key + 65, out.get(),
        [](unsigned char k) { return static_cast<char>(map[k]); });

    out[outputSize - 1] = '\0';

    return out;
}

int main() {
    auto decrypted = decryptSigningKey();
    std::cout << "Decrypted signing key: " << decrypted.get() << std::endl;

    return 0;
}

main.py

map = [
    0xd1, 0x09, 0xcb, 0x63, 0x16, 0x34, 0x23, 0xe6, 0xcf, 0x90, 0xf1, 0x18, 0x2d, 0xb9, 0x0f, 0x2c,
    0xb5, 0x00, 0x8a, 0x1d, 0xf2, 0x06, 0x9b, 0x51, 0xd6, 0xa4, 0x65, 0x3e, 0xd5, 0xac, 0x07, 0x54,
    0x6e, 0xad, 0x76, 0x69, 0x40, 0x88, 0x72, 0x95, 0x98, 0x1f, 0xf8, 0x59, 0xea, 0x6f, 0x50, 0xa3,
    0x12, 0x55, 0x87, 0x70, 0xc2, 0xd4, 0x01, 0x78, 0x10, 0x61, 0x84, 0x5d, 0xd0, 0x82, 0x4c, 0x03,
    0x17, 0xc0, 0xf5, 0xf3, 0x5f, 0xa5, 0x42, 0x97, 0x31, 0x2a, 0xa8, 0x47, 0x5c, 0x4d, 0x93, 0x02,
    0x24, 0x64, 0x30, 0x8d, 0x21, 0xc1, 0x2b, 0xe8, 0x53, 0x83, 0x85, 0x49, 0xa2, 0x11, 0x37, 0xbe,
    0x48, 0xb6, 0xf6, 0x9e, 0x26, 0x35, 0x04, 0x0e, 0x67, 0x6b, 0xc3, 0xd9, 0xdd, 0x9f, 0xeb, 0x14,
    0x7e, 0xba, 0x73, 0x80, 0xb8, 0xbd, 0xfa, 0xca, 0x77, 0xd7, 0xc8, 0x75, 0xe2, 0xbb, 0xe3, 0x1c,
    0x96, 0x36, 0xa9, 0x0d, 0xaa, 0x3f, 0xc7, 0xb1, 0x62, 0x38, 0x0b, 0xfc, 0xa0, 0x27, 0x7b, 0xb2,
    0xe5, 0xfb, 0xc9, 0x15, 0x71, 0xf4, 0x1b, 0xfe, 0x44, 0x2e, 0x5a, 0x79, 0xa7, 0x19, 0xfd, 0x3b,
    0x8b, 0x22, 0xa1, 0xec, 0xdf, 0x66, 0x4a, 0xed, 0x20, 0x86, 0x3d, 0x6c, 0x5e, 0x99, 0x43, 0xaf,
    0xe1, 0x0a, 0xef, 0xd3, 0x13, 0xde, 0x94, 0x68, 0xb4, 0xcd, 0x6a, 0xdc, 0xff, 0x3c, 0x7d, 0xe7,
    0x91, 0x29, 0x25, 0xc5, 0x33, 0x6d, 0x7a, 0x39, 0xe4, 0x3a, 0x4f, 0x1e, 0xdb, 0x41, 0x56, 0x4e,
    0x9c, 0x81, 0xe9, 0xb7, 0xbf, 0xe0, 0x9a, 0x52, 0xc4, 0x8c, 0x7f, 0x0c, 0x57, 0x2f, 0xab, 0x74,
    0x1a, 0x92, 0x45, 0x46, 0xce, 0x4b, 0xbc, 0xf0, 0x89, 0xf9, 0xb0, 0xb3, 0xd2, 0x58, 0x08, 0xcc,
    0xd8, 0xc6, 0xda, 0x32, 0xa6, 0x28, 0xee, 0x5b, 0x8f, 0x05, 0xae, 0x9d, 0x60, 0x8e, 0xf7, 0x7c
]

key = [
    0x89, 0x03, 0x5e, 0x39, 0x88, 0x39, 0x39, 0x65, 0xa5, 0xc7, 0x52, 0x65, 0xa5, 0x5e, 0x52, 0x05,
    0x52, 0x52, 0x03, 0x89, 0x48, 0x88, 0xa5, 0xc4, 0x39, 0x48, 0x39, 0x48, 0x52, 0x48, 0x1a, 0x5e,
    0x65, 0xa5, 0x5e, 0xf3, 0x48, 0x52, 0x48, 0x52, 0x05, 0x88, 0x48, 0xc7, 0xc7, 0x48, 0xa5, 0x52,
    0x03, 0x51, 0x65, 0xf3, 0x05, 0x52, 0x39, 0x39, 0x89, 0x52, 0x03, 0x05, 0x51, 0xc7, 0xc7, 0x51,
    0x11
]

def decrypt_signing_key():
    output_size = 66
    out = bytearray(output_size)
    
    for i in range(65):
        out[i] = map[key[i]]
        
    out[output_size - 1] = 0
    return out.decode('ascii', errors='ignore')

def main():
    decrypted = decrypt_signing_key()
    print(f"Decrypted signing key: {decrypted}")

if __name__ == "__main__":
    main()