Write functions to handle loading and saving words a block at a time, taking into

account endian differences.

The current code does not take advantage of the knowledge of which endianness
we are running on; an optimization suggested by Yves Jerschow is to use (unsafe)
casts to speed up the load/store operations. This turns out to provide large
performance increases (30% or more) in some cases.

Even without the unsafe casts, this version seems to average a few percent
faster, probably because the longer loading loops have been partially or
fully unrolled.

This also makes the code implementing low-level algorithms like ciphers and
hashes a bit more succint.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/rmd160.cpp b/src/rmd160.cpp
index 6cc80d999..e092b19a2 100644
--- a/src/rmd160.cpp
+++ b/src/rmd160.cpp
@@ -73,7 +73,7 @@ inline void F5(u32bit& A, u32bit B, u32bit& C, u32bit D, u32bit E,
 void RIPEMD_160::hash(const byte input[])
    {
    for(u32bit j = 0; j != 16; ++j)
-      M[j] = make_u32bit(input[4*j+3], input[4*j+2], input[4*j+1], input[4*j]);
+      M[j] = load_le<u32bit>(input, j);
 
    u32bit A1 = digest[0], A2 = A1, B1 = digest[1], B2 = B1,
           C1 = digest[2], C2 = C1, D1 = digest[3], D2 = D1,
@@ -179,8 +179,8 @@ void RIPEMD_160::hash(const byte input[])
 *************************************************/
 void RIPEMD_160::copy_out(byte output[])
    {
-   for(u32bit j = 0; j != OUTPUT_LENGTH; ++j)
-      output[j] = get_byte(3 - (j % 4), digest[j/4]);
+   for(u32bit j = 0; j != OUTPUT_LENGTH; j += 4)
+      store_le(digest[j/4], output + j);
    }
 
 /*************************************************