Tor  0.4.6.0-alpha-dev
keccak-tiny.h
1 #ifndef KECCAK_FIPS202_H
2 #define KECCAK_FIPS202_H
3 
4 #include <stddef.h>
5 #include "lib/cc/torint.h"
6 
7 #define KECCAK_MAX_RATE 200
8 
9 /* Calculate the rate (block size) from the security target. */
10 #define KECCAK_RATE(bits) (KECCAK_MAX_RATE - (bits / 4))
11 
12 /* The internal structure of a FIPS202 hash/xof instance. Most callers
13  * should treat this as an opaque structure.
14  */
15 typedef struct keccak_state {
16  uint8_t a[KECCAK_MAX_RATE];
17  size_t rate;
18  uint8_t delim;
19 
20  uint8_t block[KECCAK_MAX_RATE];
21  size_t offset;
22 
23  uint8_t finalized : 1;
24 } __attribute__((aligned(8))) keccak_state;
25 
26 /* Initialize a Keccak instance suitable for SHA-3 hash functions. */
27 int keccak_digest_init(keccak_state *s, size_t bits);
28 
29 /* Feed more data into the SHA-3 hash instance. */
30 int keccak_digest_update(keccak_state *s, const uint8_t *buf, size_t len);
31 
32 /* Calculate the SHA-3 hash digest. The state is unmodified to support
33  * calculating multiple/rolling digests.
34  */
35 int keccak_digest_sum(const keccak_state *s, uint8_t *out, size_t outlen);
36 
37 /* Initialize a Keccak instance suitable for XOFs (SHAKE-128/256). */
38 int keccak_xof_init(keccak_state *s, size_t bits);
39 
40 /* Absorb more data into the XOF. Must not be called after a squeeze call. */
41 int keccak_xof_absorb(keccak_state *s, const uint8_t *buf, size_t len);
42 
43 /* Squeeze data out of the XOF. Must not attempt to absorb additional data,
44  * after a squeeze has been called.
45  */
46 int keccak_xof_squeeze(keccak_state *s, uint8_t *out, size_t outlen);
47 
48 /* Clone an existing hash/XOF instance. */
49 void keccak_clone(keccak_state *out, const keccak_state *in);
50 
51 /* Cleanse sensitive data from a given hash instance. */
52 void keccak_cleanse(keccak_state *s);
53 
54 #define decshake(bits) \
55  int shake##bits(uint8_t*, size_t, const uint8_t*, size_t);
56 
57 #define decsha3(bits) \
58  int sha3_##bits(uint8_t*, size_t, const uint8_t*, size_t);
59 
60 decshake(128)
61 decshake(256)
62 decsha3(224)
63 decsha3(256)
64 decsha3(384)
65 decsha3(512)
66 #endif
torint.h
Integer definitions used throughout Tor.
keccak_state
Definition: keccak-tiny.h:15