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codex32: document the complete representations from BIP, adjust numbers.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2023-07-31 09:06:38 +09:30
parent 9721ddd2ab
commit bf2d9b19c6
1 changed files with 24 additions and 3 deletions
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27
common/codex32.c
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@ -1,3 +1,25 @@
/* Implementation of BIP-93 "codex32: Checksummed SSSS-aware BIP32 seeds".
*
* There are two representations, short and long:
*
* CODEX32 := HRP "1" SHORT-DATA | LONG-DATA
* HRP := "ms" | "MS"
* SHORT-DATA := THRESHOLD IDENTIFIER SHAREINDEX SHORT-PAYLOAD SHORT-CHECKSUM
* LONG-DATA := THRESHOLD IDENTIFIER SHAREINDEX LONG-PAYLOAD LONG-CHECKSUM
*
* THRESHOLD = "0" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
* IDENTIFER := BECH32*4
* SHAREINDEX := BECH32
*
* SHORT-PAYLOAD := BECH32 [0 - 74 times]
* SHORT-CHECKSUM := BECH32*13
*
* LONG-PAYLOAD := BECH32 [75 - 103 times]
* LONG-CHECKSUM := BECH32*15
*
* Thus, a short codex32 string has 22 bytes of non-payload, so 22 to 96 characters long.
* A long codex32 string has 24 bytes of non-payload, so 99 to 127 characters.
*/
#include "config.h"
#include <assert.h>
#include <bitcoin/chainparams.h>
@ -301,10 +323,9 @@ struct codex32 *codex32_decode(const tal_t *ctx,
}
}
/* FIXME: Confirm if the numbers are correct. */
if (codex32str_len >= 48 && codex32str_len < 94) {
if (codex32str_len >= 22 && codex32str_len <= 96) {
parts->codexl = false;
} else if (codex32str_len >= 125 && codex32str_len < 128) {
} else if (codex32str_len >= 99 && codex32str_len <= 127) {
parts->codexl = true;
} else {
*fail = tal_fmt(ctx, "Invalid length!");