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cleaned code
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@VeronicaGupta
VeronicaGupta committed Jan 19, 2024
1 parent 4afec1a commit 701083a
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Showing 3 changed files with 46 additions and 313 deletions.
8 changes: 1 addition & 7 deletions include/utility.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,13 +18,7 @@ void get_keys(const char *mnemonic, const char *passphrase, uint8_t* public_key,
void node_details(HDNode node);
void hash256(const uint8_t *data, uint8_t *output, size_t size);

void generate_scriptSig(const uint8_t *signature, uint8_t *scriptSig, uint8_t* publicKey, size_t sig_len, size_t scriptSig_len, size_t pubkey_len);
void generate_scriptPubKey(const uint8_t *scriptSig, size_t scriptSigLen, uint8_t *scriptPubKey, uint8_t scriptPubKey_len);

void concatenate_arrays(uint8_t *dest, const uint8_t *src1, size_t len1, const uint8_t *src2, size_t len2);
int broadcast_transaction(uint8_t* signed_txn, uint8_t signed_txn_len);

void prepare_signed_txn(uint8_t* unsigned_txn, uint8_t* scriptSig, uint8_t* signed_txn, size_t unsigned_txn_len, size_t scriptSig_len, size_t signed_txn_len);
void generate_vrs(const uint8_t *signature, uint8_t *scriptSig, uint8_t* publicKey, size_t sig_len, size_t scriptSig_len, size_t pubkey_len);
void prepare_final_txn(uint8_t* unsigned_txn, uint8_t* packet, uint8_t* final_txn, size_t unsigned_txn_len, size_t packet_len, size_t final_txn_len, int start_len, int end_len);

#endif
129 changes: 24 additions & 105 deletions src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,122 +13,41 @@ int main() {
uint8_t public_key[pubkey_len];
uint8_t private_key[privkey_len];

// ***************when txn is done****************************//

// get unsigned_txn_hex from tool (blockcypher + infura)
// const char *unsigned_txn_hex = "0200000001223ebf37da5987ed45ec2bdee33697e6fdd752823b645d545cac8994ff158c88110000001976a914d96ad3c56a2d03446c0192712119b6741d3d9ee788acffffffff0260ea0000000000001976a914ed614881f32c024a80d1b6b58dfed8f493f41c7288ac95a14200000000001976a91499ccf9022fe5173d2194659687382f235169bc5788ac0000000001000000";
const char *unsigned_txn_hex = "0200000001b51b69ce81f857ede9791dd67cddd25f7b1690b0cf04dc4ca79f570c59cc1551010000001976a91499ccf9022fe5173d2194659687382f235169bc5788acffffffff0260ea0000000000001976a914ed614881f32c024a80d1b6b58dfed8f493f41c7288ac15a94100000000001976a914a21ba3c5f5a4f7652db388eabcbc2048f8eaa9a088ac0000000001000000";

printf("\nunsigned txn[%d bytes] : %s\n", strlen(unsigned_txn_hex)/2, unsigned_txn_hex);

// get unsigned txn bytearray
size_t unsigned_txn_len = strlen(unsigned_txn_hex) / 2;
uint8_t unsigned_txn[unsigned_txn_len];
print_hexarr("unsigned txn", unsigned_txn_hex, unsigned_txn_len, unsigned_txn);

//****************Changed output address in unsigned txn***************//

const int il= 32; // id len
const int sl = 25; // scriptSig unsigned txn len
const int vl = 8; // val len
const int ssl = 107; // scriptSig signed txn len

// Constants for HD path
#define PURPOSE 0x8000002C // 44 Bitcoin
#define COIN_TYPE 0x80000001 // 1 Bitcoin testnet external
#define PURPOSE 0x8000002C // 44
#define COIN_TYPE 0x8000003C // 60 Ethereum
#define ACCOUNT 0x80000000
#define CHANGE 0x00000001
#define ADDRESS_IDX 0x00000002

get_keys(mnemonic, passphrase, public_key, private_key, pubkey_len, privkey_len, PURPOSE, COIN_TYPE, ACCOUNT, CHANGE, ADDRESS_IDX);
print_arr("m441012 public key", public_key, pubkey_len); // of the input address of the unsigned txn
print_arr("m441012 private key", private_key, privkey_len); // of the input address of the unsigned txn

// get public key hash of the address
const int pubkeyHash_len = 20;
uint8_t pubkeyHash[pubkeyHash_len];
ecdsa_get_pubkeyhash(public_key, HASHER_SHA2_RIPEMD, pubkeyHash);
print_arr("pubkeyHash", pubkeyHash, pubkeyHash_len);

// generate scriptPubKey (OUTPUT) new address pubkey
size_t scriptPubKey_len = 3 + pubkeyHash_len + 2;
uint8_t scriptPubKey[scriptPubKey_len];
generate_scriptPubKey(pubkeyHash, pubkeyHash_len, scriptPubKey, scriptPubKey_len);

int start_len = (4+1)+(il+4+1)+(sl+4+1)+(vl+1);
int end_len = (vl+1+sl)+(4+4);
size_t new_unsigned_txn_len = start_len+scriptPubKey_len+end_len;
uint8_t new_unsigned_txn[new_unsigned_txn_len];
prepare_final_txn(unsigned_txn, scriptPubKey, new_unsigned_txn, unsigned_txn_len, scriptPubKey_len, new_unsigned_txn_len, start_len, end_len);

print_arr("old scriptPubKey", unsigned_txn+start_len, scriptPubKey_len);
print_arr("new scriptPubKey", scriptPubKey, scriptPubKey_len);
print_arr("old unsigned txn", unsigned_txn, unsigned_txn_len);
print_arr("new unsigned txn", new_unsigned_txn, new_unsigned_txn_len);

memcpy(unsigned_txn, new_unsigned_txn, new_unsigned_txn_len);

// get double hashed unsigned txn digest
uint8_t unsigned_txn_hash[SHA256_DIGEST_LENGTH];
hash256(unsigned_txn, unsigned_txn_hash, unsigned_txn_len);
print_arr("unsigned txn double hashed", unsigned_txn_hash, SHA256_DIGEST_LENGTH);

// ***************Sig, UnLock and Lock Script****************************//

// get keys - input address
#define PURPOSE 0x8000002C // 44 Bitcoin
#define COIN_TYPE 0x80000001 // 1 Bitcoin testnet external
#define ACCOUNT 0x80000000
#define CHANGE 0x00000001
#define CHANGE 0x00000000
#define ADDRESS_IDX 0x00000000

get_keys(mnemonic, passphrase, public_key, private_key, pubkey_len, privkey_len, PURPOSE, COIN_TYPE, ACCOUNT, CHANGE, ADDRESS_IDX);
print_arr("m441010 public key", public_key, pubkey_len); // of the input address of the unsigned txn
print_arr("m441010 private key", private_key, privkey_len); // of the input address of the unsigned txn

// get raw signature
int sig_raw_len = pubkey_len*2; // R+S
uint8_t sig_raw[sig_raw_len];
ecdsa_sign_digest(&secp256k1, private_key, unsigned_txn_hash, sig_raw, 0, 0);
print_arr("signature raw", sig_raw, sig_raw_len);
get_keys(mnemonic, passphrase, public_key, private_key, pubkey_len, privkey_len, PURPOSE, COIN_TYPE, ACCOUNT, CHANGE, ADDRESS_IDX);
print_arr("m4460000 public key", public_key, pubkey_len); // of the input address of the unsigned txn
print_arr("m4460000 private key", private_key, privkey_len); // of the input address of the unsigned txn

int result = ecdsa_verify_digest(&secp256k1, public_key, sig_raw, unsigned_txn_hash);
// ***************when txn is done****************************//

if (result == 0) {
printf("Transaction signing successful.\n");
} else {
fprintf(stderr, "Error: Transaction signing failed at %d.\n", result);
}
// get unsigned_txn_hex
// const char *unsigned_txn_hex = "0200000001b51b69ce81f857ede9791dd67cddd25f7b1690b0cf04dc4ca79f570c59cc1551010000001976a91499ccf9022fe5173d2194659687382f235169bc5788acffffffff0260ea0000000000001976a914ed614881f32c024a80d1b6b58dfed8f493f41c7288ac15a94100000000001976a914a21ba3c5f5a4f7652db388eabcbc2048f8eaa9a088ac0000000001000000";

// get der signature
int sig_len = 4+sig_raw_len+2; // <overheads + sig_raw>
uint8_t* sig[sig_len];
memzero(sig, sig_len);
sig_len=ecdsa_sig_to_der(sig_raw, sig);
print_arr("signature", sig, sig_len);

// generate scriptSig (INPUT)
size_t scriptSig_len = (1 + sig_len +1) + (1 + pubkey_len); // <opcode + sig+ sighash + pubkey>
uint8_t scriptSig[scriptSig_len];
generate_scriptSig(sig, scriptSig, public_key, sig_len, scriptSig_len, pubkey_len);
print_arr("scriptSig", scriptSig, scriptSig_len);
// printf("\nunsigned txn[%d bytes] : %s\n", strlen(unsigned_txn_hex)/2, unsigned_txn_hex);

// *******************************************
// // get unsigned txn bytearray
// size_t unsigned_txn_len = strlen(unsigned_txn_hex) / 2;
// uint8_t unsigned_txn[unsigned_txn_len];
// print_hexarr("unsigned txn", unsigned_txn_hex, unsigned_txn_len, unsigned_txn);



// ***************signed TXN****************************
start_len = (4+1)+(il+4+1);
end_len = (4+1)+2*(vl+1+sl)+(4+4);
size_t signed_txn_len = start_len+scriptSig_len+end_len;
uint8_t signed_txn[signed_txn_len];
prepare_final_txn(unsigned_txn, scriptSig, signed_txn, unsigned_txn_len, scriptSig_len, signed_txn_len, start_len, end_len);
// start_len = (4+1)+(il+4+1);
// end_len = (4+1)+2*(vl+1+sl)+(4+4);
// size_t signed_txn_len = start_len+scriptSig_len+end_len;
// uint8_t signed_txn[signed_txn_len];
// prepare_final_txn(unsigned_txn, scriptSig, signed_txn, unsigned_txn_len, scriptSig_len, signed_txn_len, start_len, end_len);

print_arr("unsigned txn", unsigned_txn, unsigned_txn_len);
print_arr("new scriptSig", scriptSig, scriptSig_len);
print_arr("signed txn", signed_txn, signed_txn_len);
// print_arr("unsigned txn", unsigned_txn, unsigned_txn_len);
// print_arr("new scriptSig", scriptSig, scriptSig_len);
// print_arr("signed txn", signed_txn, signed_txn_len);

// const char* verified_signed_txn="0200000001223ebf37da5987ed45ec2bdee33697e6fdd752823b645d545cac8994ff158c88110000006b483045022100ad14a660a926b92bbe8ced3350412d35dffa57db1cb3ea7a7df5f0a479fcdf1a0220117cdebba30f1db7eaa9a6978b05a59535ec757ba350149d3322dbbcac0c26af012102b97a7f40dfd0a9989143797ded1ba7abc9105f5fc8b87ac2fce695de29684902ffffffff0260ea0000000000001976a914ed614881f32c024a80d1b6b58dfed8f493f41c7288ac95a14200000000001976a91499ccf9022fe5173d2194659687382f235169bc5788ac0000000001000000";
// printf("\nverify txn[%d bytes]: %s\n\n", strlen(verified_signed_txn)/2, verified_signed_txn);
// compare_keys("sign", signed_txn, verified_signed_txn, strlen(verified_signed_txn)/2);

return 0;
}
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