feat(bignum): Add initial bignum hardware acceleration

Libs need to be rebuilt:
- cargo +stable xtask compile
- cargo +stable xtask bindings

Signed-off-by: Anthony Grondin <=>

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "mbedtls"]
 	path = mbedtls
-	url = https://github.com/Mbed-TLS/mbedtls
+	url = https://github.com/espressif/mbedtls

Cargo.toml

@@ -72,7 +72,9 @@ static_cell = { version = "=1.2", features = ["nightly"] }
 
 esp-mbedtls = { path = "./esp-mbedtls" }
 
-[target.xtensa-esp32s3-none-elf.dependencies]
+[[example]]
+name              = "crypto_self_test"
+required-features = ["esp-wifi/wifi-logs"]
 
 [[example]]
 name = "async_client"

esp-mbedtls-sys/headers/esp32c3/config.h

@@ -3609,6 +3609,8 @@
 /* MPI / BIGNUM options */
 //#define MBEDTLS_MPI_WINDOW_SIZE            2 /**< Maximum window size used. */
 //#define MBEDTLS_MPI_MAX_SIZE            1024 /**< Maximum number of bytes for usable MPIs. */
+#define MBEDTLS_MPI_EXP_MOD_ALT
+// #define MBEDTLS_MPI_MUL_MPI_ALT
 
 /* CTR_DRBG options */
 //#define MBEDTLS_CTR_DRBG_ENTROPY_LEN               48 /**< Amount of entropy used per seed by default (48 with SHA-512, 32 with SHA-256) */

esp-mbedtls-sys/headers/esp32s3/config.h

@@ -3609,6 +3609,9 @@
 /* MPI / BIGNUM options */
 //#define MBEDTLS_MPI_WINDOW_SIZE            2 /**< Maximum window size used. */
 //#define MBEDTLS_MPI_MAX_SIZE            1024 /**< Maximum number of bytes for usable MPIs. */
+// #define MBEDTLS_BIGNUM_ALT
+#define MBEDTLS_MPI_EXP_MOD_ALT
+#define MBEDTLS_MPI_MUL_MPI_ALT
 
 /* CTR_DRBG options */
 //#define MBEDTLS_CTR_DRBG_ENTROPY_LEN               48 /**< Amount of entropy used per seed by default (48 with SHA-512, 32 with SHA-256) */

esp-mbedtls-sys/src/include/esp32.rs

@@ -4808,6 +4808,7 @@ extern "C" {
     ///                      buffer of length \p blen Bytes. It may be \c NULL if
     ///                      \p blen is zero.
     /// \param blen          The length of \p buf in Bytes.
+    /// \param md_alg        The hash algorithm used to hash the original data.
     /// \param f_rng_blind   The RNG function used for blinding. This must not be
     ///                      \c NULL.
     /// \param p_rng_blind   The RNG context to be passed to \p f_rng. This may be

esp-mbedtls-sys/src/include/esp32c3.rs

@@ -4810,6 +4810,7 @@ extern "C" {
     ///                      buffer of length \p blen Bytes. It may be \c NULL if
     ///                      \p blen is zero.
     /// \param blen          The length of \p buf in Bytes.
+    /// \param md_alg        The hash algorithm used to hash the original data.
     /// \param f_rng_blind   The RNG function used for blinding. This must not be
     ///                      \c NULL.
     /// \param p_rng_blind   The RNG context to be passed to \p f_rng. This may be

esp-mbedtls-sys/src/include/esp32s2.rs

@@ -4808,6 +4808,7 @@ extern "C" {
     ///                      buffer of length \p blen Bytes. It may be \c NULL if
     ///                      \p blen is zero.
     /// \param blen          The length of \p buf in Bytes.
+    /// \param md_alg        The hash algorithm used to hash the original data.
     /// \param f_rng_blind   The RNG function used for blinding. This must not be
     ///                      \c NULL.
     /// \param p_rng_blind   The RNG context to be passed to \p f_rng. This may be

esp-mbedtls-sys/src/include/esp32s3.rs

@@ -4808,6 +4808,7 @@ extern "C" {
     ///                      buffer of length \p blen Bytes. It may be \c NULL if
     ///                      \p blen is zero.
     /// \param blen          The length of \p buf in Bytes.
+    /// \param md_alg        The hash algorithm used to hash the original data.
     /// \param f_rng_blind   The RNG function used for blinding. This must not be
     ///                      \c NULL.
     /// \param p_rng_blind   The RNG context to be passed to \p f_rng. This may be

esp-mbedtls/Cargo.toml

@@ -8,10 +8,12 @@ esp-mbedtls-sys = { path = "../esp-mbedtls-sys" }
 log = "0.4.17"
 embedded-io = { version = "0.6.1" }
 embedded-io-async = { version = "0.6.0", optional = true }
+crypto-bigint = { version = "0.5.3", default-features = false, features = ["extra-sizes"] }
 esp32-hal = { version = "0.16.0", optional = true }
 esp32c3-hal = { version = "0.13.0", optional = true }
 esp32s2-hal = { version = "0.13.0", optional = true }
 esp32s3-hal = { version = "0.13.0", optional = true }
+cfg-if = "1.0.0"
 
 [features]
 async = ["dep:embedded-io-async"]