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CR50: add support for hardware modexp

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This commit includes changes required for
supporting a hardware based montgomery
modexp (r = a ^ e mod N).

The function bn_is_bit_set() was previously
static, and now added to internal.h, as this
function is used by the hardware implementation.

Add function declarations for new functions
related to the hardware implementation to
chip/g/dcrypto/internal.h

BRANCH=none
CQ-DEPEND=CL:*260618,CL:*260895
BUG=chrome-os-partner:43025,chrome-os-partner:47524
TEST=all tests in test/tpm_test/tpmtest.py pass

Change-Id: I5fe4a6692678b64f27659f42a08d200b6fe6f0cc
Signed-off-by: nagendra modadugu <ngm@google.com>
Reviewed-on: https://chromium-review.googlesource.com/347462
Commit-Ready: Nagendra Modadugu <ngm@google.com>
Tested-by: Nagendra Modadugu <ngm@google.com>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
This commit is contained in:
nagendra modadugu
2016-05-31 17:10:53 -07:00
committed by chrome-bot
parent f13f45bfc9
commit a80d840509
4 changed files with 25 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
board/cr50/build.mk
View File

@@ -28,6 +28,9 @@ CFLAGS += -I$(realpath $(BDIR)/tpm2)
dirs-y += chip/$(CHIP)/dcrypto
dirs-y += $(BDIR)/tpm2
# Add hardware crypto support.
PDIR=private-cr51
# Objects that we need to build
board-y = board.o
board-${CONFIG_RDD} += rdd.o

9
chip/g/dcrypto/bn.c
View File

@@ -64,7 +64,7 @@ int bn_check_topbit(const struct BIGNUM *N)
}
/* a[n]. */
static int bn_is_bit_set(const struct BIGNUM *a, int n)
int bn_is_bit_set(const struct BIGNUM *a, int n)
{
int i, j;
@@ -340,6 +340,12 @@ void bn_mont_modexp(struct BIGNUM *output, const struct BIGNUM *input,
struct BIGNUM acc;
struct BIGNUM aR;
if (bn_bits(N) == 2048 || bn_bits(N) == 1024) {
/* TODO(ngm): add hardware support for standard key sizes. */
bn_mont_modexp_asm(output, input, exp, N);
return;
}
bn_init(&RR, RR_buf, bn_size(N));
bn_init(&acc, acc_buf, bn_size(N));
bn_init(&aR, aR_buf, bn_size(N));
@@ -348,7 +354,6 @@ void bn_mont_modexp(struct BIGNUM *output, const struct BIGNUM *input,
bn_compute_RR(&RR, N);
bn_mont_mul(&acc, NULL, &RR, nprime, N); /* R = 1 * RR / R % N */
bn_mont_mul(&aR, input, &RR, nprime, N); /* aR = a * RR / R % N */
BN_DIGIT(output, 0) = 1;
/* TODO(ngm): burn stack space and use windowing. */
for (i = exp->dmax * BN_BITS2 - 1; i >= 0; i--) {

13
chip/g/dcrypto/internal.h
View File

@@ -68,15 +68,28 @@ struct BIGNUM {
void bn_init(struct BIGNUM *bn, void *buf, size_t len);
#define bn_size(b) ((b)->dmax * BN_BYTES)
#define bn_words(b) ((b)->dmax)
#define bn_bits(b) ((b)->dmax * BN_BITS2)
int bn_check_topbit(const struct BIGNUM *N);
void bn_mont_modexp(struct BIGNUM *output, const struct BIGNUM *input,
const struct BIGNUM *exp, const struct BIGNUM *N);
void bn_mont_modexp_asm(struct BIGNUM *output, const struct BIGNUM *input,
const struct BIGNUM *exp, const struct BIGNUM *N);
uint32_t bn_add(struct BIGNUM *c, const struct BIGNUM *a);
uint32_t bn_sub(struct BIGNUM *c, const struct BIGNUM *a);
void bn_mul(struct BIGNUM *c, const struct BIGNUM *a, const struct BIGNUM *b);
int bn_modinv_vartime(struct BIGNUM *r, const struct BIGNUM *e,
const struct BIGNUM *MOD);
int bn_is_bit_set(const struct BIGNUM *a, int n);
/*
* Runtime.
*/
void dcrypto_init(void);
uint32_t dcrypto_call(uint32_t adr);
void dcrypto_imem_load(size_t offset, const uint32_t *opcodes,
size_t n_opcodes);
void dcrypto_dmem_load(size_t offset, const void *words, size_t n_words);
/*
* Utility functions.

3
include/config.h
View File

@@ -660,7 +660,8 @@
#undef CONFIG_CUSTOMIZED_RO
/*
* When enabled, build in support for hardware crypto; only supported on CR50.
* When enabled, build in support for software & hardware crypto;
* only supported on CR50.
*/
#undef CONFIG_DCRYPTO