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src/wif/k1.cpp: implement _checksum_suffix() using init/update/final ripemd160 functions.

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This commit is contained in:
Henrik Hautakoski 2023-05-30 13:59:05 +02:00
parent 225a1947ae
commit c035a804b2
1 changed files with 15 additions and 14 deletions
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29
src/wif/k1.cpp
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@ -23,7 +23,7 @@
*/
#include <libantelope/checksum.hpp>
#include <vector>
#include <libantelope/hash/ripemd160.hpp>
#include "codec.hpp"
namespace libantelope { namespace internal {
@ -31,22 +31,23 @@ namespace libantelope { namespace internal {
// 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.
void _checksum_suffix(const unsigned char *in, size_t size, const char *suffix, checksum_t check) {
std::vector<unsigned char> buf(size + 2);
void _checksum_suffix(const unsigned char *in, size_t size, checksum_t check) {
ripemd160_ctx_t ctx;
ripemd160_t md;
memcpy(buf.data(), in, size);
memcpy(buf.data() + size, suffix, 2);
ripemd160_init(&ctx);
ripemd160_update(&ctx, in, size);
ripemd160_update(&ctx, "K1", 2);
ripemd160_final(&ctx, &md);
return checksum_ripemd160(buf.data(), buf.size(), (unsigned char*) check);
std::memcpy(check, md, CHECKSUM_SIZE);
}
void pub_encoder_k1(const ec_pubkey_t& key, unsigned char *buf) {
checksum_t check;
_checksum_suffix(key.data(), EC_PUBKEY_SIZE, "K1", check);
_checksum_suffix(key.data(), EC_PUBKEY_SIZE, check);
memcpy(buf, key.data(), EC_PUBKEY_SIZE);
memcpy(buf + EC_PUBKEY_SIZE, check, CHECKSUM_SIZE);
@ -56,7 +57,7 @@ bool pub_decoder_k1(const std::vector<unsigned char>& buf, ec_pubkey_t& key) {
checksum_t check;
_checksum_suffix(buf.data(), EC_PUBKEY_SIZE, "K1", check);
_checksum_suffix(buf.data(), EC_PUBKEY_SIZE, check);
if (memcmp(buf.data() + EC_PUBKEY_SIZE, check, CHECKSUM_SIZE)) {
return false;
@ -69,7 +70,7 @@ bool pub_decoder_k1(const std::vector<unsigned char>& buf, ec_pubkey_t& key) {
size_t priv_encoder_k1(const ec_privkey_t& priv, unsigned char *buf) {
checksum_t check;
_checksum_suffix(priv.data(), EC_PRIVKEY_SIZE, "K1", check);
_checksum_suffix(priv.data(), EC_PRIVKEY_SIZE, check);
memcpy(buf, priv.data(), priv.size());
memcpy(buf + EC_PRIVKEY_SIZE, check, CHECKSUM_SIZE);
@ -84,7 +85,7 @@ bool priv_decoder_k1(const std::vector<unsigned char>& buf, ec_privkey_t& priv)
}
checksum_t check;
_checksum_suffix(buf.data(), EC_PRIVKEY_SIZE, "K1", check);
_checksum_suffix(buf.data(), EC_PRIVKEY_SIZE, check);
if (memcmp(buf.data() + EC_PRIVKEY_SIZE, check, CHECKSUM_SIZE)) {
return false;
}
@ -97,7 +98,7 @@ void sig_encoder_k1(const ec_signature_t& sig, unsigned char *buf) {
checksum_t check;
_checksum_suffix(sig.data(), EC_SIGNATURE_SIZE, "K1", check);
_checksum_suffix(sig.data(), EC_SIGNATURE_SIZE, check);
memcpy(buf, sig.data(), sig.size());
memcpy(buf + EC_SIGNATURE_SIZE, check, CHECKSUM_SIZE);
@ -112,7 +113,7 @@ bool sig_decoder_k1(const std::vector<unsigned char>& buf, ec_signature_t& sig)
}
// Calculate checksum
_checksum_suffix(buf.data(), EC_SIGNATURE_SIZE, "K1", check);
_checksum_suffix(buf.data(), EC_SIGNATURE_SIZE, check);
// And validate
if (memcmp(buf.data() + EC_SIGNATURE_SIZE, check, CHECKSUM_SIZE)) {