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common/hash_u5: routines to hash 5 bit values.

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Needed for creating/verifying signatures on bolt11 invoices.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2017-10-26 13:30:19 +10:30
parent 20ce829f81
commit 753f15f503
3 changed files with 70 additions and 1 deletions
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21
common/hash_u5.h Normal file
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/* bech32 (thus bolt11) deal in 5-bit values */
#ifndef LIGHTNING_COMMON_HASH_U5_H
#define LIGHTNING_COMMON_HASH_U5_H
#include "config.h"
#include <ccan/crypto/sha256/sha256.h>
#include <ccan/short_types/short_types.h>
/* Type to annotate a 5 bit value. */
typedef unsigned char u5;
struct hash_u5 {
u64 buf;
unsigned int num_bits;
struct sha256_ctx hash;
};
void hash_u5_init(struct hash_u5 *hu5, const char *hrp);
void hash_u5(struct hash_u5 *hu5, const u5 *u5, size_t len);
void hash_u5_done(struct hash_u5 *hu5, struct sha256 *res);
#endif /* LIGHTNING_COMMON_HASH_U5_H */