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keccak: some paranoid "can't happen" checks

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moneromooo-monero 2017-11-07 11:56:36 +00:00
parent 3dd31d33fa
commit 4877aca2b6
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1 changed files with 14 additions and 0 deletions
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14
src/crypto/keccak.c
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@ -2,6 +2,8 @@
// 19-Nov-11 Markku-Juhani O. Saarinen <mjos@iki.fi> // 19-Nov-11 Markku-Juhani O. Saarinen <mjos@iki.fi>
// A baseline Keccak (3rd round) implementation. // A baseline Keccak (3rd round) implementation.
#include <stdio.h>
#include <stdlib.h>
#include "hash-ops.h" #include "hash-ops.h"
#include "keccak.h" #include "keccak.h"
@ -79,6 +81,12 @@ int keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
uint8_t temp[144]; uint8_t temp[144];
size_t i, rsiz, rsizw; size_t i, rsiz, rsizw;
if (mdlen <= 0 || mdlen > 200 || sizeof(st) != 200)
{
fprintf(stderr, "Bad keccak use");
abort();
}
rsiz = sizeof(state_t) == mdlen ? HASH_DATA_AREA : 200 - 2 * mdlen; rsiz = sizeof(state_t) == mdlen ? HASH_DATA_AREA : 200 - 2 * mdlen;
rsizw = rsiz / 8; rsizw = rsiz / 8;
@ -91,6 +99,12 @@ int keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
} }
// last block and padding // last block and padding
if (inlen >= sizeof(temp) || inlen > rsiz || rsiz - inlen + inlen + 1 >= sizeof(temp) || rsiz == 0 || rsiz - 1 >= sizeof(temp) || rsizw * 8 > sizeof(temp))
{
fprintf(stderr, "Bad keccak use");
abort();
}
memcpy(temp, in, inlen); memcpy(temp, in, inlen);
temp[inlen++] = 1; temp[inlen++] = 1;
memset(temp + inlen, 0, rsiz - inlen); memset(temp + inlen, 0, rsiz - inlen);