cx_crc_hw syscall support

Author: apaillier-ledger

sdk/bolos_syscalls_unified_sdk.h

@@ -92,7 +92,8 @@
 #define SYSCALL_cx_ecpoint_is_at_infinity_ID_IN                       0x0200014b
 #define SYSCALL_cx_ecpoint_x25519_ID_IN                               0x0300001b
 #define SYSCALL_cx_ecpoint_x448_ID_IN                                 0x03000060
-#define SYSCALL_cx_crc32_hw_ID_IN                                     0x02000102
+#define SYSCALL_cx_crc32_hw_ID_IN                                     0x02000102 // API levels < 18
+#define SYSCALL_cx_crc_hw_ID_IN                                       0x04000102 // API levels >= 18
 #define SYSCALL_cx_get_random_bytes_ID_IN                             0x02000107
 #define SYSCALL_cx_trng_get_random_data_ID_IN                         0x02000106
 #define SYSCALL_os_perso_erase_all_ID_IN                              0x0000004b

src/bolos/cx_crc.c

@@ -2,9 +2,11 @@
 
 #include "cx.h"
 
+#define CX_CRC32_INIT 0xFFFFFFFF
+
 #define cx_crc16_update sys_cx_crc16_update
 
-static const unsigned short cx_ccitt16[] = {
+static const uint16_t cx_ccitt16[] = {
   0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108,
   0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
   0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b,
@@ -36,21 +38,19 @@ static const unsigned short cx_ccitt16[] = {
   0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
 };
 
-unsigned short sys_cx_crc16_update(unsigned short crc, const void *buf,
-                                   size_t len)
+uint16_t sys_cx_crc16_update(uint16_t crc, const void *buf, size_t len)
 {
   const uint8_t *p = buf;
-  size_t i;
 
-  for (i = 0; i < len; i++) {
+  for (size_t i = 0; i < len; i++) {
     crc = cx_ccitt16[*p++ ^ (uint16_t)(crc >> 8u)] ^ (uint16_t)(crc << 8u);
   }
   return crc;
 }
 
 #define cx_crc32_update sys_cx_crc32_update
 
-static const unsigned int cx_ccitt32[] = {
+static const uint32_t cx_ccitt32[] = {
   0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
   0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
   0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
@@ -96,14 +96,51 @@ static const unsigned int cx_ccitt32[] = {
   0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 };
 
-unsigned int sys_cx_crc32_update(unsigned int crc, const void *buf, size_t len)
+uint32_t sys_cx_crc32_update(uint32_t crc, const void *buf, size_t len)
 {
   const uint8_t *p = buf;
-  size_t i;
 
-  for (i = 0; i < len; i++) {
+  for (size_t i = 0; i < len; i++) {
     crc = cx_ccitt32[(crc ^ *p++) & 0xff] ^ (crc >> 8u);
   }
 
-  return crc ^ 0xFFFFFFFF;
+  return crc ^ CX_CRC32_INIT;
+}
+
+uint32_t sys_cx_crc32_hw(const void *buf, size_t len)
+{
+  uint32_t crc;
+  crc = sys_cx_crc32_update(CX_CRC32_INIT, buf, len);
+
+  return crc;
+}
+
+static uint32_t reverse_32_bits(uint32_t value)
+{
+  uint32_t reverse_val = 0;
+
+  for (uint8_t i = 0; i < 32; i++) {
+    if ((value & (1 << i))) {
+      reverse_val |= 1 << ((32 - 1) - i);
+    }
+  }
+  return reverse_val;
+}
+
+uint32_t sys_cx_crc_hw(crc_type_t crc_type, uint32_t crc_state, const void *buf,
+                       size_t len)
+{
+  uint32_t crc = 0;
+
+  switch (crc_type) {
+  case CRC_TYPE_CRC16_CCITT_FALSE:
+    crc = sys_cx_crc16_update(crc_state, buf, len);
+    break;
+  case CRC_TYPE_CRC32:
+    crc = sys_cx_crc32_update(reverse_32_bits(crc_state), buf, len);
+    break;
+  default:
+    break;
+  }
+  return crc;
 }

src/bolos/cx_crc.h

@@ -2,7 +2,13 @@
 
 #include <stddef.h>
 
-unsigned short sys_cx_crc16_update(unsigned short crc, const void *buf,
-                                   size_t len);
+typedef enum {
+  CRC_TYPE_CRC16_CCITT_FALSE = 0,
+  CRC_TYPE_CRC32 = 1,
+} crc_type_t;
 
-unsigned int sys_cx_crc32_update(unsigned int crc, const void *buf, size_t len);
+uint16_t sys_cx_crc16_update(uint16_t crc, const void *buf, size_t len);
+uint32_t sys_cx_crc32_update(uint32_t crc, const void *buf, size_t len);
+uint32_t sys_cx_crc32_hw(const void *_buf, size_t len);
+uint32_t sys_cx_crc_hw(crc_type_t crc_type, uint32_t crc_state, const void *buf,
+                       size_t len);

src/bolos/cxlib.c

@@ -25,11 +25,3 @@ cx_err_t sys_cx_trng_get_random_data(void *buffer, size_t len)
 
   return CX_OK;
 }
-
-uint32_t sys_cx_crc32_hw(const void *buf, size_t len)
-{
-  uint32_t crc;
-  crc = sys_cx_crc32_update(0xFFFFFFFF, buf, len);
-
-  return crc;
-}

src/bolos/cxlib.h

@@ -221,7 +221,6 @@ cx_err_t sys_cx_ecdomain_generator_bn(cx_curve_t cv, cx_ecpoint_t *P);
 unsigned int sys_get_api_level(void);
 cx_err_t sys_cx_get_random_bytes(void *buffer, size_t len);
 cx_err_t sys_cx_trng_get_random_data(void *buffer, size_t len);
-uint32_t sys_cx_crc32_hw(const void *_buf, size_t len);
 
 // cx_aes_sdk2.c
 cx_err_t sys_cx_aes_set_key_hw(const cx_aes_key_t *key, uint32_t mode);

src/emulate_unified_sdk.c

@@ -196,6 +196,12 @@ int emulate_syscall_cx(unsigned long syscall, unsigned long *parameters,
              uint8_t *, buffer,
              size_t,    len);
 
+    SYSCALL4(cx_crc_hw, "(0x%x, %u, %p, %u)",
+             crc_type_t,   crc_type,
+             uint32_t,     crc_state,
+             const void *, buf,
+             size_t,       len);
+
     SYSCALL2(cx_aes_set_key_hw, "(%p %u)",
              void *,    key,
              uint32_t,  mode);