Merge pull request #2516 from danielinux/freescale-ltc-spmath

Fixed Freescale LTC crypto module to compile with SP math

wolfcrypt/src/ecc.c

@@ -5543,7 +5543,7 @@ int wc_ecc_verify_hash_ex(mp_int *r, mp_int *s, const byte* hash,
    CRYS_ECDSA_VerifyUserContext_t sigCtxTemp;
    word32 msgLenInBytes = hashlen;
    CRYS_ECPKI_HASH_OpMode_t hash_mode;
-#elif !defined(WOLFSSL_SP_MATH)
+#elif !defined(WOLFSSL_SP_MATH) || defined(FREESCALE_LTC_ECC)
    int          did_init = 0;
    ecc_point    *mG = NULL, *mQ = NULL;
    #ifdef WOLFSSL_SMALL_STACK
@@ -5661,7 +5661,7 @@ int wc_ecc_verify_hash_ex(mp_int *r, mp_int *s, const byte* hash,
       }
   }
 
-#ifdef WOLFSSL_SP_MATH
+#if defined(WOLFSSL_SP_MATH) && !defined(FREESCALE_LTC_ECC)
   if (key->idx != ECC_CUSTOM_IDX && ecc_sets[key->idx].id == ECC_SECP256R1) {
       return sp_ecc_verify_256(hash, hashlen, key->pubkey.x, key->pubkey.y,
                                            key->pubkey.z, r, s, res, key->heap);
@@ -5669,7 +5669,7 @@ int wc_ecc_verify_hash_ex(mp_int *r, mp_int *s, const byte* hash,
   else
       return WC_KEY_SIZE_E;
 #else
-#ifdef WOLFSSL_HAVE_SP_ECC
+#if defined WOLFSSL_HAVE_SP_ECC && !defined(FREESCALE_LTC_ECC)
 #ifndef WOLFSSL_SP_NO_256
     #if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ECC)
     if (key->asyncDev.marker != WOLFSSL_ASYNC_MARKER_ECC)

wolfcrypt/src/port/nxp/ksdk_port.c

@@ -52,14 +52,10 @@ int ksdk_port_init(void)
     return 0;
 }
 
-
-/* LTC TFM */
-#if defined(FREESCALE_LTC_TFM)
-
 /* Reverse array in memory (in place) */
 static void ltc_reverse_array(uint8_t *src, size_t src_len)
 {
-    int i;
+    unsigned int i;
 
     for (i = 0; i < src_len / 2; i++) {
         uint8_t tmp;
@@ -70,6 +66,8 @@ static void ltc_reverse_array(uint8_t *src, size_t src_len)
     }
 }
 
+
+#ifndef WOLFSSL_SP_MATH
 /* same as mp_to_unsigned_bin() with mp_reverse() skipped */
 static int mp_to_unsigned_lsb_bin(mp_int *a, unsigned char *b)
 {
@@ -88,6 +86,7 @@ static int mp_to_unsigned_lsb_bin(mp_int *a, unsigned char *b)
 
     return res;
 }
+#endif
 
 static int ltc_get_lsb_bin_from_mp_int(uint8_t *dst, mp_int *A, uint16_t *psz)
 {
@@ -95,12 +94,22 @@ static int ltc_get_lsb_bin_from_mp_int(uint8_t *dst, mp_int *A, uint16_t *psz)
     uint16_t sz;
 
     sz = mp_unsigned_bin_size(A);
+#ifndef WOLFSSL_SP_MATH
     res = mp_to_unsigned_lsb_bin(A, dst); /* result is lsbyte at lowest addr as required by LTC */
+#else
+    res = mp_to_unsigned_bin(A, dst);
+    if (res == MP_OKAY) {
+        ltc_reverse_array(dst, sz); 
+    }
+#endif
     *psz = sz;
-
     return res;
 }
 
+/* LTC TFM */
+#if defined(FREESCALE_LTC_TFM)
+
+
 /* these function are used by wolfSSL upper layers (like RSA) */
 
 /* c = a * b */
@@ -113,9 +122,11 @@ int mp_mul(mp_int *A, mp_int *B, mp_int *C)
 
     /* if unsigned mul can fit into LTC PKHA let's use it, otherwise call software mul */
     if ((szA <= LTC_MAX_INT_BYTES / 2) && (szB <= LTC_MAX_INT_BYTES / 2)) {
-        int neg;
+        int neg = 0;
 
+#ifndef WOLFSSL_SP_MATH
         neg = (A->sign == B->sign) ? MP_ZPOS : MP_NEG;
+#endif
 
         /* unsigned multiply */
         uint8_t *ptrA = (uint8_t *)XMALLOC(LTC_MAX_INT_BYTES, 0, DYNAMIC_TYPE_BIGINT);
@@ -140,8 +151,10 @@ int mp_mul(mp_int *A, mp_int *B, mp_int *C)
             }
         }
 
+#ifndef WOLFSSL_SP_MATH
         /* fix sign */
         C->sign = neg;
+#endif
         if (ptrA) {
             XFREE(ptrA, NULL, DYNAMIC_TYPE_BIGINT);
         }
@@ -153,7 +166,11 @@ int mp_mul(mp_int *A, mp_int *B, mp_int *C)
         }
     }
     else {
+#ifdef WOLFSSL_SP_MATH
+        res = sp_mul(A, B, C);
+#else
         res = wolfcrypt_mp_mul(A, B, C);
+#endif
     }
     return res;
 }
@@ -169,13 +186,15 @@ int mp_mod(mp_int *a, mp_int *b, mp_int *c)
     if ((szA <= LTC_MAX_INT_BYTES) && (szB <= LTC_MAX_INT_BYTES))
     {
 #endif /* FREESCALE_LTC_TFM_RSA_4096_ENABLE */
-        int neg;
+        int neg = 0;
         uint8_t *ptrA = (uint8_t *)XMALLOC(LTC_MAX_INT_BYTES, 0, DYNAMIC_TYPE_BIGINT);
         uint8_t *ptrB = (uint8_t *)XMALLOC(LTC_MAX_INT_BYTES, 0, DYNAMIC_TYPE_BIGINT);
         uint8_t *ptrC = (uint8_t *)XMALLOC(LTC_MAX_INT_BYTES, 0, DYNAMIC_TYPE_BIGINT);
 
+#ifndef WOLFSSL_SP_MATH
         /* get sign for the result */
         neg = (a->sign == b->sign) ? MP_ZPOS : MP_NEG;
+#endif
 
         /* get remainder of unsigned a divided by unsigned b */
         if (ptrA && ptrB && ptrC) {
@@ -200,8 +219,10 @@ int mp_mod(mp_int *a, mp_int *b, mp_int *c)
             res = MP_MEM;
         }
 
+#ifndef WOLFSSL_SP_MATH
         /* fix sign */
         c->sign = neg;
+#endif
 
         if (ptrA) {
             XFREE(ptrA, NULL, DYNAMIC_TYPE_BIGINT);
@@ -257,7 +278,9 @@ int mp_invmod(mp_int *a, mp_int *b, mp_int *c)
             res = MP_MEM;
         }
 
+#ifndef WOLFSSL_SP_MATH
         c->sign = a->sign;
+#endif
         if (ptrA) {
             XFREE(ptrA, NULL, DYNAMIC_TYPE_BIGINT);
         }
@@ -297,6 +320,7 @@ int mp_mulmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d)
         /* if A or B is negative, subtract abs(A) or abs(B) from modulus to get positive integer representation of the
          * same number */
         res = mp_init(&t);
+#ifndef WOLFSSL_SP_MATH
         if (a->sign) {
             if (res == MP_OKAY)
                 res = mp_add(a, c, &t);
@@ -309,6 +333,7 @@ int mp_mulmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d)
             if (res == MP_OKAY)
                 res = mp_copy(&t, b);
         }
+#endif
 
         if (res == MP_OKAY && ptrA && ptrB && ptrC && ptrD) {
             uint16_t sizeA, sizeB, sizeC, sizeD;
@@ -413,12 +438,14 @@ int mp_exptmod(mp_int *G, mp_int *X, mp_int *P, mp_int *Y)
 
         /* if G is negative, add modulus to convert to positive number for LTC */
         res = mp_init(&t);
+#ifndef WOLFSSL_SP_MATH
         if (G->sign) {
             if (res == MP_OKAY)
                 res = mp_add(G, P, &t);
             if (res == MP_OKAY)
                 res = mp_copy(&t, G);
         }
+#endif
 
         if (res == MP_OKAY && ptrG && ptrX && ptrP) {
             res = ltc_get_lsb_bin_from_mp_int(ptrG, G, &sizeG);
@@ -731,7 +758,9 @@ int wc_ecc_mulmod_ex(mp_int *k, ecc_point *G, ecc_point *R, mp_int* a,
         /* if k is negative, we compute the multiplication with abs(-k)
          * with result (x, y) and modify the result to (x, -y)
          */
+#ifndef WOLFSSL_SP_MATH
         R->y->sign = k->sign;
+#endif
     }
     if (res == MP_OKAY)
         res = mp_set(R->z, 1);

wolfcrypt/src/sp_int.c

@@ -52,6 +52,16 @@ WOLFSSL_LOCAL int sp_ModExp_3072(sp_int* base, sp_int* exp, sp_int* mod,
 
 #endif
 
+int sp_get_digit_count(sp_int *a)
+{
+    int ret;
+    if (!a)
+        ret = 0;
+    else
+        ret = a->used;
+    return ret;
+}
+
 /* Initialize the big number to be zero.
  *
  * a  SP integer.
@@ -388,6 +398,18 @@ int sp_copy(sp_int* a, sp_int* r)
     }
     return MP_OKAY;
 }
+
+/* creates "a" then copies b into it */
+int sp_init_copy (sp_int * a, sp_int * b)
+{
+  int     res;
+  if ((res = sp_init(a)) == MP_OKAY) {
+      if((res = sp_copy (b, a)) != MP_OKAY) {
+          sp_clear(a);
+      }
+  }
+  return res;
+}
 #endif
 
 /* Set the big number to be the value of the digit.
@@ -561,7 +583,7 @@ int sp_sub(sp_int* a, sp_int* b, sp_int* r)
  * n    Number of bits to shift.
  * r    SP integer result.
  */
-static void sp_rshb(sp_int* a, int n, sp_int* r)
+void sp_rshb(sp_int* a, int n, sp_int* r)
 {
     int i;
     int j;
@@ -704,6 +726,8 @@ static int sp_div(sp_int* a, sp_int* d, sp_int* r, sp_int* rem)
     return err;
 }
 
+
+#ifndef FREESCALE_LTC_TFM
 /* Calculate the remainder of dividing a by m: r = a mod m.
  *
  * a  SP integer.
@@ -716,6 +740,7 @@ int sp_mod(sp_int* a, sp_int* m, sp_int* r)
     return sp_div(a, m, NULL, r);
 }
 #endif
+#endif
 
 /* Clear all data in the big number and sets value to zero.
  *

wolfssl/wolfcrypt/port/nxp/ksdk_port.h

@@ -25,6 +25,8 @@
 #include <wolfssl/wolfcrypt/settings.h>
 #ifdef USE_FAST_MATH
     #include <wolfssl/wolfcrypt/tfm.h>
+#elif defined WOLFSSL_SP_MATH
+    #include <wolfssl/wolfcrypt/sp_int.h>
 #else
     #include <wolfssl/wolfcrypt/integer.h>
 #endif
@@ -44,6 +46,10 @@ int ksdk_port_init(void);
 	int wolfcrypt_mp_mod(mp_int *a, mp_int *b, mp_int *c);
 	int wolfcrypt_mp_invmod(mp_int *a, mp_int *b, mp_int *c);
 	int wolfcrypt_mp_exptmod(mp_int *G, mp_int *X, mp_int *P, mp_int *Y);
+
+    /* Exported mp_mulmod function */
+    int mp_mulmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d);
+
 #endif /* FREESCALE_LTC_TFM */
 
 #if defined(FREESCALE_LTC_ECC)

wolfssl/wolfcrypt/sp_int.h

@@ -187,6 +187,10 @@ MP_API int sp_exptmod(sp_int* b, sp_int* e, sp_int* m, sp_int* r);
 MP_API int sp_prime_is_prime(mp_int* a, int t, int* result);
 MP_API int sp_prime_is_prime_ex(mp_int* a, int t, int* result, WC_RNG* rng);
 MP_API int sp_exch(sp_int* a, sp_int* b);
+MP_API int sp_get_digit_count(sp_int *a);
+MP_API int sp_init_copy (sp_int * a, sp_int * b);
+MP_API void sp_rshb(sp_int* a, int n, sp_int* r);
+
 
 #define MP_OKAY    0
 #define MP_NO      0
@@ -249,6 +253,9 @@ MP_API int sp_exch(sp_int* a, sp_int* b);
 #define mp_prime_is_prime           sp_prime_is_prime
 #define mp_prime_is_prime_ex        sp_prime_is_prime_ex
 #define mp_exch                     sp_exch
+#define get_digit_count             sp_get_digit_count
+#define mp_init_copy                sp_init_copy
+#define mp_rshb(A,x)                sp_rshb(A,x,A)
 
 #endif