/*
* hashes.c
* --------
*
* HAL interface to Cryptech hash cores.
*
* Authors: Joachim Strömbergson, Paul Selkirk, Rob Austein
* Copyright (c) 2014-2015, SUNET
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "cryptech.h"
/* Longest digest block we support at the moment */
#define MAX_BLOCK_LEN SHA512_BLOCK_LEN
/* Hash state */
typedef struct {
uint64_t msg_length_high; /* Total data hashed in this message */
uint64_t msg_length_low; /* (128 bits in SHA-512 cases) */
size_t block_length; /* Block length for this algorithm */
uint8_t block[MAX_BLOCK_LEN]; /* Block we're accumulating */
size_t block_used; /* How much of the block we've used */
unsigned block_count; /* Blocks sent */
} hash_state_t;
static int debug = 0;
/*
* Debugging control.
*/
void hal_hash_set_debug(int onoff)
{
debug = onoff;
}
/*
* Tell caller how much space to allocate for a hash_state_t. This
* lets us hide details that are nobody else's business while letting
* somebody else deal with memory allocation (and is the way
* Cryptlib's HAL code works, not by coincidence).
*/
size_t hal_hash_state_size(void)
{
return sizeof(hash_state_t);
}
void hal_hash_state_initialize(void *_state)
{
hash_state_t *state = _state;
assert(state != NULL);
memset(state, 0, sizeof(*state));
}
/*
* Report whether cores are present.
*/
hal_error_t hash_sha1_core_present(void)
{
return hal_io_expected(SHA1_ADDR_NAME0, (const uint8_t *) (SHA1_NAME0 SHA1_NAME1), 8);
}
hal_error_t hash_sha256_core_present(void)
{
return hal_io_expected(SHA256_ADDR_NAME0, (const uint8_t *) (SHA256_NAME0 SHA256_NAME1), 8);
}
hal_error_t hash_sha512_core_present(void)
{
return hal_io_expected(SHA512_ADDR_NAME0, (const uint8_t *) (SHA512_NAME0 SHA512_NAME1), 8);
}
/*
* Send one block to a core.
*/
static hal_error_t hash_write_block(const off_t block_addr,
const off_t ctrl_addr,
const off_t status_addr,
const uint8_t ctrl_mode,
const hash_state_t * const state)
{
uint8_t ctrl_cmd[4];
hal_error_t err;
assert(state != NULL && state->block_length % 4 == 0);
if (debug)
fprintf(stderr, "[ %s ]\n", state->block_count == 0 ? "init" : "next");
if ((err = hal_io_write(block_addr, state->block, state->block_length)) != HAL_OK)
return err;
ctrl_cmd[0] = ctrl_cmd[1] = ctrl_cmd[2] = 0;
ctrl_cmd[3] = state->block_count == 0 ? CTRL_INIT : CTRL_NEXT;
ctrl_cmd[3] |= ctrl_mode;
/*
* Not sure why we're waiting for ready here, but it's what the old
* (read: tested) code did, so keep that behavior for now.
*/
if ((err = hal_io_write(ctrl_addr, ctrl_cmd, sizeof(ctrl_cmd))) != HAL_OK)
return err;
return hal_io_wait_valid(status_addr);
}
/*
* Read hash result from core.
*/
static hal_error_t hash_read_digest(const off_t digest_addr,
const off_t status_addr,
uint8_t *digest,
const size_t digest_length)
{
hal_error_t err;
assert(digest != NULL && digest_length % 4 == 0);
if ((err = hal_io_wait_valid(status_addr)) != HAL_OK)
return err;
return hal_io_read(digest_addr, digest, digest_length);
}
/*
* Hash data. All supported hash algorithms use similar block
* manipulations and padding algorithms, so all can use this method
* with a few parameters which we handle via closures below.
*/
static hal_error_t hash_do_hash(hash_state_t *state, /* Opaque state block */
const uint8_t * const data_buffer, /* Data to be hashed */
size_t data_buffer_length, /* Length of data_buffer */
uint8_t *digest_buffer, /* Returned digest */
const size_t digest_buffer_length, /* Length of digest_buffer */
const size_t block_length, /* Length of a block */
const size_t digest_length, /* Length of resulting digest */
const size_t length_length, /* Length of the length field */
const off_t block_addr, /* Where to write hash blocks */
const off_t ctrl_addr, /* Control register */
const off_t status_addr, /* Status register */
const off_t digest_addr, /* Where to read digest */
const uint8_t ctrl_mode) /* Digest mode, for cores that have modes */
{
hal_error_t err;
size_t n;
int i;
if (state == NULL ||
(state->block_length != 0 && state->block_length != block_length) ||
(data_buffer_length > 0 && data_buffer == NULL) ||
(data_buffer_length == 0 && digest_buffer == NULL) ||
(digest_buffer != NULL && digest_buffer_length < digest_length))
return HAL_ERROR_BAD_ARGUMENTS;
if (state->block_length == 0)
state->block_length = block_length;
assert(block_length <= sizeof(state->block));
if (data_buffer_length > 0) { /* We have data to hash */
const uint8_t *p = data_buffer;
while ((n = state->block_length - state->block_used) <= data_buffer_length) {
/*
* We have enough data for another complete block.
*/
if (debug)
fprintf(stderr, "[ Full block, data_buffer_length %lu, used %lu, n %lu, msg_length %llu ]\n",
(unsigned long) data_buffer_length, (unsigned long) state->block_used, (unsigned long) n, state->msg_length_low);
memcpy(state->block + state->block_used, p, n);
if ((state->msg_length_low += n) < n)
state->msg_length_high++;
state->block_used = 0;
data_buffer_length -= n;
p += n;
if ((err = hash_write_block(block_addr, ctrl_addr, status_addr, ctrl_mode, state)) != HAL_OK)
return err;
state->block_count++;
}
if (data_buffer_length > 0) {
/*
* Data left over, but not enough for a full block, stash it.
*/
if (debug)
fprintf(stderr, "[ Partial block, data_buffer_length %lu, used %lu, n %lu, msg_length %llu ]\n",
(unsigned long) data_buffer_length, (unsigned long) state->block_used, (unsigned long) n, state->msg_length_low);
assert(data_buffer_length < n);
memcpy(state->block + state->block_used, p, data_buffer_length);
if ((state->msg_length_low += data_buffer_length) < data_buffer_length)
state->msg_length_high++;
state->block_used += data_buffer_length;
}
}
else { /* Done: add padding, then pull result from the core */
uint64_t bit_length_low = (state->msg_length_low << 3);
uint64_t bit_length_high = (state->msg_length_high << 3) | (state->msg_length_low >> 61);
uint8_t *p;
/* Initial pad byte */
assert(state->block_used < state->block_length);
state->block[state->block_used++] = 0x80;
/* If not enough room for bit count, zero and push current block */
if ((n = state->block_length - state->block_used) < length_length) {
if (debug)
fprintf(stderr, "[ Overflow block, data_buffer_length %lu, used %lu, n %lu, msg_length %llu ]\n",
(unsigned long) data_buffer_length, (unsigned long) state->block_used, (unsigned long) n, state->msg_length_low);
if (n > 0)
memset(state->block + state->block_used, 0, n);
if ((err = hash_write_block(block_addr, ctrl_addr, status_addr, ctrl_mode, state)) != HAL_OK)
return err;
state->block_count++;
state->block_used = 0;
}
/* Pad final block */
n = state->block_length - state->block_used;
assert(n >= length_length);
if (n > 0)
memset(state->block + state->block_used, 0, n);
if (debug)
fprintf(stderr, "[ Final block, data_buffer_length %lu, used %lu, n %lu, msg_length %llu ]\n",
(unsigned long) data_buffer_length, (unsigned long) state->block_used, (unsigned long) n, state->msg_length_low);
p = state->block + state->block_length;
for (i = 0; (bit_length_low || bit_length_high) && i < length_length; i++) {
*--p = (uint8_t) (bit_length_low & 0xFF);
bit_length_low >>= 8;
if (bit_length_high) {
bit_length_low |= ((bit_length_high & 0xFF) << 56);
bit_length_high >>= 8;
}
}
/* Push final block */
if ((err = hash_write_block(block_addr, ctrl_addr, status_addr, ctrl_mode, state)) != HAL_OK)
return err;
state->block_count++;
/* All data pushed to core, now we just need to read back the result */
if ((err = hash_read_digest(digest_addr, status_addr, digest_buffer, digest_length)) != HAL_OK)
return err;
}
return HAL_OK;
}
/*
* Closures to provide the public API.
*/
hal_error_t hal_hash_sha1(void *state,
const uint8_t *data_buffer,
const size_t data_buffer_length,
uint8_t *digest_buffer,
const size_t digest_buffer_length)
{
return hash_do_hash(state, data_buffer, data_buffer_length, digest_buffer, digest_buffer_length,
SHA1_BLOCK_LEN, SHA1_DIGEST_LEN, SHA1_LENGTH_LEN,
SHA1_ADDR_BLOCK, SHA1_ADDR_CTRL, SHA1_ADDR_STATUS, SHA1_ADDR_DIGEST, 0);
}
hal_error_t hal_hash_sha256(void *state,
const uint8_t *data_buffer,
const size_t data_buffer_length,
uint8_t *digest_buffer,
const size_t digest_buffer_length)
{
return hash_do_hash(state, data_buffer, data_buffer_length, digest_buffer, digest_buffer_length,
SHA256_BLOCK_LEN, SHA256_DIGEST_LEN, SHA256_LENGTH_LEN,
SHA256_ADDR_BLOCK, SHA256_ADDR_CTRL, SHA256_ADDR_STATUS, SHA256_ADDR_DIGEST, 0);
}
hal_error_t hal_hash_sha512_224(void *state,
const uint8_t *data_buffer,
const size_t data_buffer_length,
uint8_t *digest_buffer,
const size_t digest_buffer_length)
{
return hash_do_hash(state, data_buffer, data_buffer_length, digest_buffer, digest_buffer_length,
SHA512_BLOCK_LEN, SHA512_DIGEST_LEN, SHA512_LENGTH_LEN,
SHA512_ADDR_BLOCK, SHA512_ADDR_CTRL, SHA512_ADDR_STATUS, SHA512_ADDR_DIGEST,
MODE_SHA_512_224);
}
hal_error_t hal_hash_sha512_256(void *state,
const uint8_t *data_buffer,
const size_t data_buffer_length,
uint8_t *digest_buffer,
const size_t digest_buffer_length)
{
return hash_do_hash(state, data_buffer, data_buffer_length, digest_buffer, digest_buffer_length,
SHA512_BLOCK_LEN, SHA512_DIGEST_LEN, SHA512_LENGTH_LEN,
SHA512_ADDR_BLOCK, SHA512_ADDR_CTRL, SHA512_ADDR_STATUS, SHA512_ADDR_DIGEST,
MODE_SHA_512_256);
}
hal_error_t hal_hash_sha384(void *state,
const uint8_t *data_buffer,
const size_t data_buffer_length,
uint8_t *digest_buffer,
const size_t digest_buffer_length)
{
return hash_do_hash(state, data_buffer, data_buffer_length, digest_buffer, digest_buffer_length,
SHA512_BLOCK_LEN, SHA512_DIGEST_LEN, SHA512_LENGTH_LEN,
SHA512_ADDR_BLOCK, SHA512_ADDR_CTRL, SHA512_ADDR_STATUS, SHA512_ADDR_DIGEST,
MODE_SHA_384);
}
hal_error_t hal_hash_sha512(void *state,
const uint8_t *data_buffer,
const size_t data_buffer_length,
uint8_t *digest_buffer,
const size_t digest_buffer_length)
{
return hash_do_hash(state, data_buffer, data_buffer_length, digest_buffer, digest_buffer_length,
SHA512_BLOCK_LEN, SHA512_DIGEST_LEN, SHA512_LENGTH_LEN,
SHA512_ADDR_BLOCK, SHA512_ADDR_CTRL, SHA512_ADDR_STATUS, SHA512_ADDR_DIGEST,
MODE_SHA_512);
}
/*
* "Any programmer who fails to comply with the standard naming, formatting,
* or commenting conventions should be shot. If it so happens that it is
* inconvenient to shoot him, then he is to be politely requested to recode
* his program in adherence to the above standard."
* -- Michael Spier, Digital Equipment Corporation
*
* Local variables:
* indent-tabs-mode: nil
* End:
*/
