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bolt11: expose routine to parse bolt11 string except signature.

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This means we can hand around unsigned bolt11s.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2020-12-14 11:51:19 +10:30 committed by Christian Decker
parent d66dbd473a
commit 32d66b2740
2 changed files with 49 additions and 13 deletions
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52
common/bolt11.c
View File

@ -550,24 +550,25 @@ struct bolt11 *new_bolt11(const tal_t *ctx,
return b11;
}
/* Decodes and checks signature; returns NULL on error. */
struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
const struct feature_set *our_features,
const char *description,
const struct chainparams *must_be_chain,
char **fail)
/* Extracts signature but does not check it. */
struct bolt11 *bolt11_decode_nosig(const tal_t *ctx, const char *str,
const struct feature_set *our_features,
const char *description,
const struct chainparams *must_be_chain,
struct sha256 *hash,
u5 **sig,
bool *have_n,
char **fail)
{
char *hrp, *amountstr, *prefix;
u5 *data;
size_t data_len;
struct bolt11 *b11 = new_bolt11(ctx, NULL);
u8 sig_and_recid[65];
secp256k1_ecdsa_recoverable_signature sig;
struct hash_u5 hu5;
struct sha256 hash;
bool have_p = false, have_n = false, have_d = false, have_h = false,
bool have_p = false, have_d = false, have_h = false,
have_x = false, have_c = false, have_s = false;
*have_n = false;
b11->routes = tal_arr(b11, struct route_info *, 0);
/* BOLT #11:
@ -737,7 +738,7 @@ struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
case 'n':
problem = decode_n(b11, &hu5, &data,
&data_len, data_length,
&have_n);
have_n);
break;
case 'x':
@ -795,7 +796,31 @@ struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
"h: does not match description");
}
hash_u5_done(&hu5, &hash);
hash_u5_done(&hu5, hash);
*sig = tal_dup_arr(ctx, u5, data, data_len, 0);
return b11;
}
/* Decodes and checks signature; returns NULL on error. */
struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
const struct feature_set *our_features,
const char *description,
const struct chainparams *must_be_chain,
char **fail)
{
u5 *sigdata;
size_t data_len;
u8 sig_and_recid[65];
secp256k1_ecdsa_recoverable_signature sig;
struct bolt11 *b11;
struct sha256 hash;
bool have_n;
b11 = bolt11_decode_nosig(ctx, str, our_features, description,
must_be_chain, &hash, &sigdata, &have_n,
fail);
if (!b11)
return NULL;
/* BOLT #11:
*
@ -807,7 +832,8 @@ struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
* boundary, with a trailing byte containing the recovery ID
* (0, 1, 2, or 3).
*/
if (!pull_bits(NULL, &data, &data_len, sig_and_recid, 520, false))
data_len = tal_count(sigdata);
if (!pull_bits(NULL, &sigdata, &data_len, sig_and_recid, 520, false))
return decode_fail(b11, fail, "signature truncated");
assert(data_len == 0);

10
common/bolt11.h
View File

@ -94,6 +94,16 @@ struct bolt11 *bolt11_decode(const tal_t *ctx, const char *str,
const struct chainparams *must_be_chain,
char **fail);
/* Extracts signature but does not check it. */
struct bolt11 *bolt11_decode_nosig(const tal_t *ctx, const char *str,
const struct feature_set *our_features,
const char *description,
const struct chainparams *must_be_chain,
struct sha256 *hash,
u5 **sig,
bool *have_n,
char **fail);
/* Initialize an empty bolt11 struct with optional amount */
struct bolt11 *new_bolt11(const tal_t *ctx,
const struct amount_msat *msat TAKES);