Make asm implementations distinctly named objects, for instance MD5_IA32,

rather than silently replacing the C++ versions. Instead they are silently
replaced (currently, at least) at the lookup level: we switch off the set
of feature macros set to choose the best implementation in the current
build configuration. So you can have (and benchmark) MD5 and MD5_IA32
directly against each other in the same program with no hassles, but if
you ask for "MD5", you'll get maybe an MD5 or maybe MD5_IA32.

Also make the canonical asm names (which aren't guarded by C++ namespaces)
of the form botan_<algo>_<arch>_<func> as in botan_sha160_ia32_compress,
to avoid namespace collisions.

This change has another bonus that it should in many cases be possible to
derive the asm specializations directly from the original implementation,
saving some code (and of course logically SHA_160_IA32 is a SHA_160, just
one with a faster implementation of the compression function, so this seems
reasonable anyway).

1 files changed, 49 insertions, 0 deletions

diff --git a/src/hash/sha1_ia32/sha1_ia32.cpp b/src/hash/sha1_ia32/sha1_ia32.cpp
new file mode 100644
index 000000000..4e24b0793
--- /dev/null
+++ b/src/hash/sha1_ia32/sha1_ia32.cpp
@@ -0,0 +1,49 @@
+/*************************************************
+* SHA-160 (IA-32) Source File                    *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/sha1_ia32.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+namespace {
+
+extern "C"
+void botan_sha160_ia32_compress(u32bit[5], const byte[64], u32bit[81]);
+
+}
+
+/*************************************************
+* SHA-160 Compression Function                   *
+*************************************************/
+void SHA_160_IA32::hash(const byte input[])
+   {
+   botan_sha160_ia32_compress(digest, input, W);
+   }
+
+/*************************************************
+* Copy out the digest                            *
+*************************************************/
+void SHA_160_IA32::copy_out(byte output[])
+   {
+   for(u32bit j = 0; j != OUTPUT_LENGTH; ++j)
+      output[j] = get_byte(j % 4, digest[j/4]);
+   }
+
+/*************************************************
+* Clear memory of sensitive data                 *
+*************************************************/
+void SHA_160_IA32::clear() throw()
+   {
+   MDx_HashFunction::clear();
+   W.clear();
+   digest[0] = 0x67452301;
+   digest[1] = 0xEFCDAB89;
+   digest[2] = 0x98BADCFE;
+   digest[3] = 0x10325476;
+   digest[4] = 0xC3D2E1F0;
+   }
+
+}