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-rw-r--r--ecdsa.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/ecdsa.c b/ecdsa.c
index 04e67b8..16d2b27 100644
--- a/ecdsa.c
+++ b/ecdsa.c
@@ -89,6 +89,18 @@
#endif
/*
+ * Whether to use the Verilog point multipliers.
+ */
+
+#ifndef HAL_ECDSA_VERILOG_ECDSA256_MULTIPLIER
+#define HAL_ECDSA_VERILOG_ECDSA256_MULTIPLIER 1
+#endif
+
+#ifndef HAL_ECDSA_VERILOG_ECDSA384_MULTIPLIER
+#define HAL_ECDSA_VERILOG_ECDSA384_MULTIPLIER 1
+#endif
+
+/*
* Whether we want debug output.
*/
@@ -124,6 +136,7 @@ typedef struct {
fp_digit rho; /* Montgomery reduction value */
const uint8_t *oid; /* OBJECT IDENTIFIER */
size_t oid_len; /* Length of OBJECT IDENTIFIER */
+ hal_curve_name_t curve; /* Curve name */
} ecdsa_curve_t;
/*
@@ -206,6 +219,7 @@ static const ecdsa_curve_t * const get_curve(const hal_curve_name_t curve)
fp_montgomery_calc_normalization(curve_p256.mu, curve_p256.q);
curve_p256.oid = p256_oid;
curve_p256.oid_len = sizeof(p256_oid);
+ curve_p256.curve = HAL_CURVE_P256;
fp_read_unsigned_bin(curve_p384.q, unconst_uint8_t(p384_q), sizeof(p384_q));
fp_read_unsigned_bin(curve_p384.b, unconst_uint8_t(p384_b), sizeof(p384_b));
@@ -218,6 +232,7 @@ static const ecdsa_curve_t * const get_curve(const hal_curve_name_t curve)
fp_montgomery_calc_normalization(curve_p384.mu, curve_p384.q);
curve_p384.oid = p384_oid;
curve_p384.oid_len = sizeof(p384_oid);
+ curve_p384.curve = HAL_CURVE_P384;
fp_read_unsigned_bin(curve_p521.q, unconst_uint8_t(p521_q), sizeof(p521_q));
fp_read_unsigned_bin(curve_p521.b, unconst_uint8_t(p521_b), sizeof(p521_b));
@@ -230,6 +245,7 @@ static const ecdsa_curve_t * const get_curve(const hal_curve_name_t curve)
fp_montgomery_calc_normalization(curve_p521.mu, curve_p521.q);
curve_p521.oid = p521_oid;
curve_p521.oid_len = sizeof(p521_oid);
+ curve_p521.curve = HAL_CURVE_P521;
initialized = 1;
}
@@ -749,6 +765,113 @@ static inline hal_error_t get_random(void *buffer, const size_t length)
#endif /* HAL_ECDSA_DEBUG_ONLY_STATIC_TEST_VECTOR_RANDOM */
/*
+ * Use experimental Verilog base point multiplier cores to calculate
+ * public key given a private key. point_pick_random() has already
+ * selected a suitable private key for us, we just need to calculate
+ * the corresponding public key.
+ */
+
+#if HAL_ECDSA_VERILOG_ECDSA256_MULTIPLIER || HAL_ECDSA_VERILOG_ECDSA384_MULTIPLIER
+
+typedef struct {
+ size_t bytes;
+ const char *name;
+ hal_addr_t k_addr;
+ hal_addr_t x_addr;
+ hal_addr_t y_addr;
+} verilog_ecdsa_driver_t;
+
+static hal_error_t verilog_point_pick_random(const verilog_ecdsa_driver_t * const driver,
+ fp_int *k,
+ ec_point_t *P)
+{
+ assert(k != NULL && P != NULL);
+
+ const size_t len = fp_unsigned_bin_size(k);
+ uint8_t b[driver->bytes];
+ const uint8_t zero[4] = {0, 0, 0, 0};
+ hal_core_t *core = NULL;
+ hal_error_t err;
+
+ if (len > sizeof(b))
+ return HAL_ERROR_RESULT_TOO_LONG;
+
+ if ((err = hal_core_alloc(driver->name, &core)) != HAL_OK)
+ goto fail;
+
+#define check(_x_) do { if ((err = (_x_)) != HAL_OK) goto fail; } while (0)
+
+ memset(b, 0, sizeof(b));
+ fp_to_unsigned_bin(k, b + sizeof(b) - len);
+
+ for (int i = 0; i < sizeof(b); i += 4)
+ check(hal_io_write(core, driver->k_addr + i/4, &b[sizeof(b) - 4 - i], 4));
+
+ check(hal_io_write(core, ADDR_CTRL, zero, sizeof(zero)));
+ check(hal_io_next(core));
+ check(hal_io_wait_valid(core));
+
+ for (int i = 0; i < sizeof(b); i += 4)
+ check(hal_io_read(core, driver->x_addr + i/4, &b[sizeof(b) - 4 - i], 4));
+ fp_read_unsigned_bin(P->x, b, sizeof(b));
+
+ for (int i = 0; i < sizeof(b); i += 4)
+ check(hal_io_read(core, driver->y_addr + i/4, &b[sizeof(b) - 4 - i], 4));
+ fp_read_unsigned_bin(P->y, b, sizeof(b));
+
+ fp_set(P->z, 1);
+
+#undef check
+
+ err = HAL_OK;
+
+ fail:
+ hal_core_free(core);
+ memset(b, 0, sizeof(b));
+ return err;
+}
+
+#endif
+
+static inline hal_error_t verilog_p256_point_pick_random(fp_int *k, ec_point_t *P)
+{
+#if HAL_ECDSA_VERILOG_ECDSA256_MULTIPLIER
+
+ static const verilog_ecdsa_driver_t p256_driver = {
+ .name = ECDSA256_NAME,
+ .bytes = ECDSA256_OPERAND_BITS / 8,
+ .k_addr = ECDSA256_ADDR_K,
+ .x_addr = ECDSA256_ADDR_X,
+ .y_addr = ECDSA256_ADDR_Y
+ };
+
+ return verilog_point_pick_random(&p256_driver, k, P);
+
+#endif
+
+ return HAL_ERROR_CORE_NOT_FOUND;
+}
+
+static inline hal_error_t verilog_p384_point_pick_random(fp_int *k, ec_point_t *P)
+{
+#if HAL_ECDSA_VERILOG_ECDSA384_MULTIPLIER
+
+ static const verilog_ecdsa_driver_t p384_driver = {
+ .name = ECDSA384_NAME,
+ .bytes = ECDSA384_OPERAND_BITS / 8,
+ .k_addr = ECDSA384_ADDR_K,
+ .x_addr = ECDSA384_ADDR_X,
+ .y_addr = ECDSA384_ADDR_Y
+ };
+
+ return verilog_point_pick_random(&p384_driver, k, P);
+
+#endif
+
+ return HAL_ERROR_CORE_NOT_FOUND;
+}
+
+/*
* Pick a random point on the curve, return random scalar and
* resulting point.
*/
@@ -792,6 +915,24 @@ static hal_error_t point_pick_random(const ecdsa_curve_t * const curve,
memset(k_buf, 0, sizeof(k_buf));
+#if HAL_ECDSA_VERILOG_ECDSA256_MULTIPLIER || HAL_ECDSA_VERILOG_ECDSA384_MULTIPLIER
+ switch (curve->curve) {
+
+ case HAL_CURVE_P256:
+ if ((err = verilog_p256_point_pick_random(k, P)) != HAL_ERROR_CORE_NOT_FOUND)
+ return err;
+ break;
+
+ case HAL_CURVE_P384:
+ if ((err = verilog_p384_point_pick_random(k, P)) != HAL_ERROR_CORE_NOT_FOUND)
+ return err;
+ break;
+
+ default:
+ break;
+ }
+#endif
+
/*
* Calculate P = kG and return.
*/