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WIF: Support PUB_K1 format.

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This commit is contained in:
Henrik Hautakoski 2023-03-23 19:15:25 +01:00
parent 9114c17315
commit ebb4219024
4 changed files with 101 additions and 25 deletions
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56
src/WIF.cpp
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@ -31,18 +31,18 @@ namespace libeosio {
#define PRIV_KEY_PREFIX 0x80 /* 0x80 for "Bitcoin mainnet". Always used by EOS. */
// Just to make it "harder" the calculated checksum for a signature
// has a "K1" suffix that is not present in the WIF encoded string.
// Just to make it "harder" the calculated checksum for a signature (k1) and pub/priv keys in k1/r1 format.
// has a suffix that is not present in the WIF encoded string.
// So this function is a quick hack to calculate it.
//
// Should implement and use Init/Update/Finalize hash functions to do it inplace.
checksum_t _calculate_sig_checksum(const unsigned char *in) {
unsigned char buf[EC_SIGNATURE_SIZE + 2];
checksum_t _checksum_suffix(const unsigned char *in, size_t size, const char *suffix) {
unsigned char buf[size + 2];
memcpy(buf, in, EC_SIGNATURE_SIZE);
memcpy(buf + EC_SIGNATURE_SIZE, "K1", 2);
memcpy(buf, in, size);
memcpy(buf + size, suffix, 2);
return checksum_ripemd160(buf, EC_SIGNATURE_SIZE + 2);
return checksum_ripemd160(buf, size + 2);
}
std::string wif_priv_encode(const ec_privkey_t& priv) {
@ -89,20 +89,42 @@ bool wif_priv_decode(ec_privkey_t& priv, const std::string& data) {
std::string wif_pub_encode(const ec_pubkey_t& pub, const std::string& prefix) {
checksum_t check = checksum_ripemd160(pub.data(), pub.size());
checksum_t check;
unsigned char buf[EC_PUBKEY_SIZE + CHECKSUM_SIZE];
memcpy(buf, pub.data(), pub.size());
if (prefix == WIF_PUB_K1) {
check = _checksum_suffix(buf, EC_PUBKEY_SIZE, "K1");
}
// Legacy
else {
check = checksum_ripemd160(pub.data(), pub.size());
}
memcpy(buf + EC_PUBKEY_SIZE, check.data(), check.size());
return prefix.substr(0, 3) + base58_encode(buf, buf + sizeof(buf));
return prefix + base58_encode(buf, buf + sizeof(buf));
}
bool wif_pub_decode(ec_pubkey_t& pub, const std::string& data, size_t prefix_length) {
bool wif_pub_decode(ec_pubkey_t& pub, const std::string& data) {
const char *suffix;
int offset;
std::vector<unsigned char> buf;
if (!base58_decode(data.c_str() + prefix_length, buf)) {
// Check prefix
if (data.substr(0, WIF_PUB_K1.size()) == WIF_PUB_K1) {
suffix = "K1";
offset = WIF_PUB_K1.size();
} else {
// Legacy
suffix = "";
offset = 3;
}
if (!base58_decode(data.c_str() + offset, buf)) {
return false;
}
@ -110,8 +132,12 @@ bool wif_pub_decode(ec_pubkey_t& pub, const std::string& data, size_t prefix_len
return false;
}
// Calculate and validate checksum
if (!checksum_validate<checksum_ripemd160>(buf.data(), buf.size())) {
if (suffix[0] != '\0') {
checksum_t check = _checksum_suffix(buf.data(), EC_PUBKEY_SIZE, suffix);
if (memcmp(buf.data() + EC_PUBKEY_SIZE, check.data(), CHECKSUM_SIZE)) {
return false;
}
} else if (!checksum_validate<checksum_ripemd160>(buf.data(), buf.size())) {
return false;
}
@ -145,7 +171,7 @@ bool wif_sig_decode(ec_signature_t& sig, const std::string& data) {
}
// Calculate checksum
checksum = _calculate_sig_checksum(buf.data());
checksum = _checksum_suffix(buf.data(), EC_SIGNATURE_SIZE, "K1");
// And validate
if (memcmp(buf.data() + EC_SIGNATURE_SIZE, checksum.data(), CHECKSUM_SIZE)) {
@ -160,7 +186,7 @@ bool wif_sig_decode(ec_signature_t& sig, const std::string& data) {
std::string wif_sig_encode(const ec_signature_t& sig) {
unsigned char buf[EC_SIGNATURE_SIZE + CHECKSUM_SIZE];
checksum_t check = _calculate_sig_checksum(sig.data());
checksum_t check = _checksum_suffix(sig.data(), EC_SIGNATURE_SIZE, "K1");
memcpy(buf, sig.data(), sig.size());
memcpy(buf + EC_SIGNATURE_SIZE, check.data(), check.size());