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Diffstat (limited to 'rsa.c')
-rw-r--r--rsa.c43
1 files changed, 26 insertions, 17 deletions
diff --git a/rsa.c b/rsa.c
index 2483509..4ee9930 100644
--- a/rsa.c
+++ b/rsa.c
@@ -71,6 +71,7 @@
#include <assert.h>
#include "hal.h"
+#include "verilog_constants.h"
#include <tfm.h>
#include "asn1_internal.h"
@@ -182,13 +183,17 @@ static hal_error_t unpack_fp(const fp_int * const bn, uint8_t *buffer, const siz
* wrap result back up as a bignum.
*/
-static hal_error_t modexp(const fp_int * msg,
+static hal_error_t modexp(const hal_core_t *core,
+ const fp_int * msg,
const fp_int * const exp,
const fp_int * const mod,
fp_int *res)
{
hal_error_t err = HAL_OK;
+ if ((err = hal_core_check_name(&core, MODEXPS6_NAME)) != HAL_OK)
+ return err;
+
assert(msg != NULL && exp != NULL && mod != NULL && res != NULL);
fp_int reduced_msg[1] = INIT_FP_INT;
@@ -210,7 +215,8 @@ static hal_error_t modexp(const fp_int * msg,
if ((err = unpack_fp(msg, msgbuf, sizeof(msgbuf))) != HAL_OK ||
(err = unpack_fp(exp, expbuf, sizeof(expbuf))) != HAL_OK ||
(err = unpack_fp(mod, modbuf, sizeof(modbuf))) != HAL_OK ||
- (err = hal_modexp(msgbuf, sizeof(msgbuf),
+ (err = hal_modexp(core,
+ msgbuf, sizeof(msgbuf),
expbuf, sizeof(expbuf),
modbuf, sizeof(modbuf),
resbuf, sizeof(resbuf))) != HAL_OK)
@@ -237,7 +243,7 @@ static hal_error_t modexp(const fp_int * msg,
int fp_exptmod(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
{
- return modexp(a, b, c, d) == HAL_OK ? FP_OKAY : FP_VAL;
+ return modexp(NULL, a, b, c, d) == HAL_OK ? FP_OKAY : FP_VAL;
}
#else /* HAL_RSA_USE_MODEXP */
@@ -267,21 +273,21 @@ static hal_error_t modexp(const fp_int * const msg,
* try. Come back to this if it looks like a bottleneck.
*/
-static hal_error_t create_blinding_factors(const hal_rsa_key_t * const key, fp_int *bf, fp_int *ubf)
+static hal_error_t create_blinding_factors(const hal_core_t *core, const hal_rsa_key_t * const key, fp_int *bf, fp_int *ubf)
{
assert(key != NULL && bf != NULL && ubf != NULL);
uint8_t rnd[fp_unsigned_bin_size(unconst_fp_int(key->n))];
hal_error_t err = HAL_OK;
- if ((err = hal_get_random(rnd, sizeof(rnd))) != HAL_OK)
+ if ((err = hal_get_random(NULL, rnd, sizeof(rnd))) != HAL_OK)
goto fail;
fp_init(bf);
fp_read_unsigned_bin(bf, rnd, sizeof(rnd));
fp_copy(bf, ubf);
- if ((err = modexp(bf, key->e, key->n, bf)) != HAL_OK)
+ if ((err = modexp(core, bf, key->e, key->n, bf)) != HAL_OK)
goto fail;
FP_CHECK(fp_invmod(ubf, unconst_fp_int(key->n), ubf));
@@ -295,7 +301,7 @@ static hal_error_t create_blinding_factors(const hal_rsa_key_t * const key, fp_i
* RSA decryption via Chinese Remainder Theorem (Garner's formula).
*/
-static hal_error_t rsa_crt(const hal_rsa_key_t * const key, fp_int *msg, fp_int *sig)
+static hal_error_t rsa_crt(const hal_core_t *core, const hal_rsa_key_t * const key, fp_int *msg, fp_int *sig)
{
assert(key != NULL && msg != NULL && sig != NULL);
@@ -310,7 +316,7 @@ static hal_error_t rsa_crt(const hal_rsa_key_t * const key, fp_int *msg, fp_int
* Handle blinding if requested.
*/
if (blinding) {
- if ((err = create_blinding_factors(key, bf, ubf)) != HAL_OK)
+ if ((err = create_blinding_factors(core, key, bf, ubf)) != HAL_OK)
goto fail;
FP_CHECK(fp_mulmod(msg, bf, unconst_fp_int(key->n), msg));
}
@@ -319,8 +325,8 @@ static hal_error_t rsa_crt(const hal_rsa_key_t * const key, fp_int *msg, fp_int
* m1 = msg ** dP mod p
* m2 = msg ** dQ mod q
*/
- if ((err = modexp(msg, key->dP, key->p, m1)) != HAL_OK ||
- (err = modexp(msg, key->dQ, key->q, m2)) != HAL_OK)
+ if ((err = modexp(core, msg, key->dP, key->p, m1)) != HAL_OK ||
+ (err = modexp(core, msg, key->dQ, key->q, m2)) != HAL_OK)
goto fail;
/*
@@ -366,7 +372,8 @@ static hal_error_t rsa_crt(const hal_rsa_key_t * const key, fp_int *msg, fp_int
* to the caller.
*/
-hal_error_t hal_rsa_encrypt(const hal_rsa_key_t * const key,
+hal_error_t hal_rsa_encrypt(const hal_core_t *core,
+ const hal_rsa_key_t * const key,
const uint8_t * const input, const size_t input_len,
uint8_t * output, const size_t output_len)
{
@@ -380,7 +387,7 @@ hal_error_t hal_rsa_encrypt(const hal_rsa_key_t * const key,
fp_read_unsigned_bin(i, unconst_uint8_t(input), input_len);
- if ((err = modexp(i, key->e, key->n, o)) != HAL_OK ||
+ if ((err = modexp(core, i, key->e, key->n, o)) != HAL_OK ||
(err = unpack_fp(o, output, output_len)) != HAL_OK)
goto fail;
@@ -390,7 +397,8 @@ hal_error_t hal_rsa_encrypt(const hal_rsa_key_t * const key,
return err;
}
-hal_error_t hal_rsa_decrypt(const hal_rsa_key_t * const key,
+hal_error_t hal_rsa_decrypt(const hal_core_t *core,
+ const hal_rsa_key_t * const key,
const uint8_t * const input, const size_t input_len,
uint8_t * output, const size_t output_len)
{
@@ -410,9 +418,9 @@ hal_error_t hal_rsa_decrypt(const hal_rsa_key_t * const key,
*/
if (fp_iszero(key->p) || fp_iszero(key->q) || fp_iszero(key->u) || fp_iszero(key->dP) || fp_iszero(key->dQ))
- err = modexp(i, key->d, key->n, o);
+ err = modexp(core, i, key->d, key->n, o);
else
- err = rsa_crt(key, i, o);
+ err = rsa_crt(core, key, i, o);
if (err != HAL_OK || (err = unpack_fp(o, output, output_len)) != HAL_OK)
goto fail;
@@ -583,7 +591,7 @@ static hal_error_t find_prime(const unsigned prime_length,
fp_int t[1] = INIT_FP_INT;
do {
- if ((err = hal_get_random(buffer, sizeof(buffer))) != HAL_OK)
+ if ((err = hal_get_random(NULL, buffer, sizeof(buffer))) != HAL_OK)
return err;
buffer[0 ] |= 0xc0;
buffer[sizeof(buffer) - 1] |= 0x01;
@@ -600,7 +608,8 @@ static hal_error_t find_prime(const unsigned prime_length,
* Generate a new RSA keypair.
*/
-hal_error_t hal_rsa_key_gen(hal_rsa_key_t **key_,
+hal_error_t hal_rsa_key_gen(const hal_core_t *core,
+ hal_rsa_key_t **key_,
void *keybuf, const size_t keybuf_len,
const unsigned key_length,
const uint8_t * const public_exponent, const size_t public_exponent_len)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 21:01:00 +0000