Function encrypted_decode

plugins/offers.c:520–554

};

static u8 *encrypted_decode(const tal_t *ctx, const char *str, const char **fail)
{
	if (strlen(str) < 8) {
		*fail = tal_fmt(ctx, "invalid payload");
		return NULL;
	}

	size_t hrp_maxlen = strlen(str) - 6;
	char *hrp = tal_arr(ctx, char, hrp_maxlen);

	size_t data_maxlen = strlen(str) - 8;
	u5 *data = tal_arr(ctx, u5, data_maxlen);
	size_t datalen = 0;

	if (bech32_decode(hrp, data, &datalen, str, (size_t)-1)
		== BECH32_ENCODING_NONE) {
		*fail = tal_fmt(ctx, "invalid bech32 encoding");
		goto fail;
	}

	if (!streq(hrp, "clnemerg")) {
		*fail = tal_fmt(ctx, "hrp should be `clnemerg`");
		goto fail;
	}
	u8 *data8bit = tal_arr(data, u8, 0);
	if (!bech32_pull_bits(&data8bit, data, datalen*5)) {
		*fail = tal_fmt(ctx, "invalid bech32 padding");
		goto fail;
	}

	return data8bit;
fail:
	tal_free(data);
	return NULL;
}

enum likely_type {
	LIKELY_BOLT12_OFFER,