119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include "crypto_auth_hmacsha512.h"
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#include "crypto_hash_sha512.h"
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#include "crypto_verify_64.h"
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#include "randombytes.h"
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#include "utils.h"
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size_t
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crypto_auth_hmacsha512_bytes(void)
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{
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return crypto_auth_hmacsha512_BYTES;
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}
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size_t
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crypto_auth_hmacsha512_keybytes(void)
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{
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return crypto_auth_hmacsha512_KEYBYTES;
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}
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size_t
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crypto_auth_hmacsha512_statebytes(void)
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{
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return sizeof(crypto_auth_hmacsha512_state);
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}
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void
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crypto_auth_hmacsha512_keygen(unsigned char k[crypto_auth_hmacsha512_KEYBYTES])
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{
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randombytes_buf(k, crypto_auth_hmacsha512_KEYBYTES);
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}
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int
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crypto_auth_hmacsha512_init(crypto_auth_hmacsha512_state *state,
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const unsigned char *key, size_t keylen)
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{
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unsigned char pad[128];
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unsigned char khash[64];
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size_t i;
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if (keylen > 128) {
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crypto_hash_sha512_init(&state->ictx);
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crypto_hash_sha512_update(&state->ictx, key, keylen);
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crypto_hash_sha512_final(&state->ictx, khash);
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key = khash;
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keylen = 64;
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}
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crypto_hash_sha512_init(&state->ictx);
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memset(pad, 0x36, 128);
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for (i = 0; i < keylen; i++) {
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pad[i] ^= key[i];
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}
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crypto_hash_sha512_update(&state->ictx, pad, 128);
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crypto_hash_sha512_init(&state->octx);
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memset(pad, 0x5c, 128);
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for (i = 0; i < keylen; i++) {
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pad[i] ^= key[i];
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}
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crypto_hash_sha512_update(&state->octx, pad, 128);
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sodium_memzero((void *) pad, sizeof pad);
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sodium_memzero((void *) khash, sizeof khash);
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return 0;
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}
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int
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crypto_auth_hmacsha512_update(crypto_auth_hmacsha512_state *state,
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const unsigned char *in, unsigned long long inlen)
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{
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crypto_hash_sha512_update(&state->ictx, in, inlen);
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return 0;
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}
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int
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crypto_auth_hmacsha512_final(crypto_auth_hmacsha512_state *state,
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unsigned char *out)
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{
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unsigned char ihash[64];
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crypto_hash_sha512_final(&state->ictx, ihash);
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crypto_hash_sha512_update(&state->octx, ihash, 64);
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crypto_hash_sha512_final(&state->octx, out);
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sodium_memzero((void *) ihash, sizeof ihash);
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return 0;
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}
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int
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crypto_auth_hmacsha512(unsigned char *out, const unsigned char *in,
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unsigned long long inlen, const unsigned char *k)
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{
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crypto_auth_hmacsha512_state state;
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crypto_auth_hmacsha512_init(&state, k, crypto_auth_hmacsha512_KEYBYTES);
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crypto_auth_hmacsha512_update(&state, in, inlen);
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crypto_auth_hmacsha512_final(&state, out);
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return 0;
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}
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int
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crypto_auth_hmacsha512_verify(const unsigned char *h, const unsigned char *in,
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unsigned long long inlen, const unsigned char *k)
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{
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unsigned char correct[64];
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crypto_auth_hmacsha512(correct, in, inlen, k);
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return crypto_verify_64(h, correct) | (-(h == correct)) |
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sodium_memcmp(correct, h, 64);
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}
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