cstring *base58_decode_check(unsigned char *addrtype, const char *s_in)
{
/* decode base58 string */
cstring *s = base58_decode(s_in);
if (!s)
return NULL;
if (s->len < 4)
goto err_out;
/* validate with trailing hash, then remove hash */
unsigned char md32[4];
bu_Hash4(md32, s->str, s->len - 4);
if (memcmp(md32, &s->str[s->len - 4], 4))
goto err_out;
cstr_resize(s, s->len - 4);
/* if addrtype requested, remove from front of data string */
if (addrtype) {
*addrtype = (unsigned char) s->str[0];
cstr_erase(s, 0, 1);
}
return s;
err_out:
cstr_free(s, true);
return NULL;
}
cstring *message_str(const unsigned char netmagic[4],
const char *command_,
const void *data, uint32_t data_len)
{
cstring *s = cstr_new_sz(P2P_HDR_SZ + data_len);
/* network identifier (magic number) */
cstr_append_buf(s, netmagic, 4);
/* command string */
char command[12] = {};
strncpy(command, command_, 12);
cstr_append_buf(s, command, 12);
/* data length */
uint32_t data_len_le = htole32(data_len);
cstr_append_buf(s, &data_len_le, 4);
/* data checksum */
unsigned char md32[4];
bu_Hash4(md32, data, data_len);
cstr_append_buf(s, &md32[0], 4);
/* data payload */
if (data_len > 0)
cstr_append_buf(s, data, data_len);
return s;
}
GString *message_str(const unsigned char netmagic[4],
const char *command_,
const void *data, uint32_t data_len)
{
GString *s = g_string_sized_new(P2P_HDR_SZ + data_len);
/* network identifier (magic number) */
g_string_append_len(s, (gchar *) netmagic, 4);
/* command string */
char command[12] = {};
strncpy(command, command_, 12);
g_string_append_len(s, command, 12);
/* data length */
uint32_t data_len_le = GUINT32_TO_LE(data_len);
g_string_append_len(s, (gchar *) &data_len_le, 4);
/* data checksum */
unsigned char md32[4];
bu_Hash4(md32, data, data_len);
g_string_append_len(s, (gchar *) &md32[0], 4);
/* data payload */
if (data_len > 0)
g_string_append_len(s, data, data_len);
return s;
}
bool message_valid(const struct p2p_message *msg)
{
if (!msg)
return false;
/* data checksum */
unsigned char md32[4];
if (msg->hdr.data_len)
bu_Hash4(md32, msg->data, msg->hdr.data_len);
else
bu_Hash4(md32, "", 0);
if (memcmp(msg->hdr.hash, md32, sizeof(md32)))
return false;
return true;
}
cstring *base58_encode_check(unsigned char addrtype, bool have_addrtype,
const void *data, size_t data_len)
{
cstring *s = cstr_new_sz(data_len + 1 + 4);
if (have_addrtype)
cstr_append_c(s, addrtype);
cstr_append_buf(s, data, data_len);
unsigned char md32[4];
bu_Hash4(md32, s->str, s->len);
cstr_append_buf(s, md32, 4);
cstring *s_enc = base58_encode(s->str, s->len);
cstr_free(s, true);
return s_enc;
}
