switching to dedicated endian switching function

[arm-crypto-lib.git] / sha2 / sha2_large_common.c

diff --git a/sha2/sha2_large_common.c b/sha2/sha2_large_common.c
index 1ae6b908afc0583cfce3c13c8613b95ad0d85afa..6f89a947ef2357a66453350e55cbbea80e5863ae 100644 (file)
--- a/sha2/sha2_large_common.c
+++ b/sha2/sha2_large_common.c
@@ -46,7 +46,6 @@ uint64_t sha2_large_common_const[80] = {
 0x4cc5d4becb3e42b6LL, 0x597f299cfc657e2aLL, 0x5fcb6fab3ad6faecLL, 0x6c44198c4a475817LL
 };
 
-
 static const
 uint64_t change_endian64(uint64_t x){
        uint64_t r=0;
@@ -59,8 +58,6 @@ uint64_t change_endian64(uint64_t x){
        return r;
 }
 
-
-
 static const
 uint64_t rotr64(uint64_t x, uint8_t n){
        return (x>>n)|(x<<(64-n));
@@ -78,17 +75,26 @@ uint64_t rotl64(uint64_t x, uint8_t n){
 #define SIGMA_a(x) (rotr64((x),  1) ^ rotr64((x),  8) ^ ((x)>>7))
 #define SIGMA_b(x) (rotr64((x), 19) ^ rotl64((x),  3) ^ ((x)>>6))
 
+static
+void load_endian64_changed(uint8_t* dest, uint8_t* src, uint16_t words){
+       uint8_t i;
+       while(words--){
+               i = 7;
+               do{
+                       *dest++ = src[i];
+               }while(i--);
+               src += 8;
+       }
+}
+
 void sha2_large_common_nextBlock(sha2_large_common_ctx_t* ctx, const void* block){
        uint64_t w[16], wx;
        uint64_t a[8];
        uint64_t t1, t2;
        const uint64_t *k=sha2_large_common_const;
        uint8_t i;
-       i=16;
-       do{
-               w[16-i] = change_endian64(*((const uint64_t*)block));
-               block = (uint8_t*)block + 8;
-       }while(--i);
+
+       load_endian64_changed((uint8_t*)w, (uint8_t*)block, 16);
        memcpy(a, ctx->h, 8*8);
        for(i=0; i<80; ++i){
                if(i<16){