Merge pull request #7187 from SparkiDev/sha256_intel_instrs

SHA-256: Implementation using Intel instructions

Author: douzzer

wolfcrypt/src/cpuid.c

@@ -96,6 +96,7 @@
             if (cpuid_flag(7, 0, EBX, 19)) { cpuid_flags |= CPUID_ADX   ; }
             if (cpuid_flag(1, 0, ECX, 22)) { cpuid_flags |= CPUID_MOVBE ; }
             if (cpuid_flag(7, 0, EBX,  3)) { cpuid_flags |= CPUID_BMI1  ; }
+            if (cpuid_flag(7, 0, EBX, 29)) { cpuid_flags |= CPUID_SHA   ; }
 
             cpuid_check = 1;
         }

wolfcrypt/src/sha256.c

@@ -302,7 +302,15 @@ static int InitSha256(wc_Sha256* sha256)
     extern "C" {
 #endif
 
+        extern int Transform_Sha256_SSE2_Sha(wc_Sha256 *sha256,
+                                             const byte* data);
+        extern int Transform_Sha256_SSE2_Sha_Len(wc_Sha256* sha256,
+                                                 const byte* data, word32 len);
     #if defined(HAVE_INTEL_AVX1)
+        extern int Transform_Sha256_AVX1_Sha(wc_Sha256 *sha256,
+                                             const byte* data);
+        extern int Transform_Sha256_AVX1_Sha_Len(wc_Sha256* sha256,
+                                                 const byte* data, word32 len);
         extern int Transform_Sha256_AVX1(wc_Sha256 *sha256, const byte* data);
         extern int Transform_Sha256_AVX1_Len(wc_Sha256* sha256,
                                              const byte* data, word32 len);
@@ -356,6 +364,22 @@ static int InitSha256(wc_Sha256* sha256)
 
         intel_flags = cpuid_get_flags();
 
+        if (IS_INTEL_SHA(intel_flags)) {
+        #ifdef HAVE_INTEL_AVX1
+            if (IS_INTEL_AVX1(intel_flags)) {
+                Transform_Sha256_p = Transform_Sha256_AVX1_Sha;
+                Transform_Sha256_Len_p = Transform_Sha256_AVX1_Sha_Len;
+                Transform_Sha256_is_vectorized = 1;
+            }
+            else
+        #endif
+            {
+                Transform_Sha256_p = Transform_Sha256_SSE2_Sha;
+                Transform_Sha256_Len_p = Transform_Sha256_SSE2_Sha_Len;
+                Transform_Sha256_is_vectorized = 1;
+            }
+        }
+        else
     #ifdef HAVE_INTEL_AVX2
         if (IS_INTEL_AVX2(intel_flags)) {
         #ifdef HAVE_INTEL_RORX