From 88b872f2afb9d71b91a155d05d517dbd593d30ca Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Sun, 26 Oct 2008 21:07:44 +0000
Subject: In KDF instead of lookup, instantiate fixed hashes (MD5, SHA-1)
 directly

---
 src/kdf/ssl_prf/info.txt     |  2 ++
 src/kdf/ssl_prf/prf_ssl3.cpp | 29 +++++++++++++++--------------
 2 files changed, 17 insertions(+), 14 deletions(-)

(limited to 'src/kdf/ssl_prf')

diff --git a/src/kdf/ssl_prf/info.txt b/src/kdf/ssl_prf/info.txt
index 8c85745c2..890789988 100644
--- a/src/kdf/ssl_prf/info.txt
+++ b/src/kdf/ssl_prf/info.txt
@@ -6,6 +6,8 @@ load_on auto
 
 <requires>
 kdf
+md5
+sha1
 </requires>
 
 <add>
diff --git a/src/kdf/ssl_prf/prf_ssl3.cpp b/src/kdf/ssl_prf/prf_ssl3.cpp
index b241bf60f..29c29ba7e 100644
--- a/src/kdf/ssl_prf/prf_ssl3.cpp
+++ b/src/kdf/ssl_prf/prf_ssl3.cpp
@@ -4,7 +4,8 @@
 *************************************************/
 
 #include <botan/prf_ssl3.h>
-#include <botan/lookup.h>
+#include <botan/sha160.h>
+#include <botan/md5.h>
 #include <memory>
 
 namespace Botan {
@@ -15,24 +16,24 @@ namespace {
 * Return the next inner hash                     *
 *************************************************/
 OctetString next_hash(u32bit where, u32bit want,
-                      HashFunction* md5, HashFunction* sha1,
+                      HashFunction& md5, HashFunction& sha1,
                       const byte secret[], u32bit secret_len,
                       const byte seed[], u32bit seed_len)
    {
-   if(want > md5->OUTPUT_LENGTH)
+   if(want > md5.OUTPUT_LENGTH)
       throw Internal_Error("SSL3_PRF:next_hash: want is too big");
 
    const byte ASCII_A_CHAR = 0x41;
 
    for(u32bit j = 0; j != where + 1; j++)
-      sha1->update(ASCII_A_CHAR + where);
-   sha1->update(secret, secret_len);
-   sha1->update(seed, seed_len);
-   SecureVector<byte> sha1_hash = sha1->final();
+      sha1.update(ASCII_A_CHAR + where);
+   sha1.update(secret, secret_len);
+   sha1.update(seed, seed_len);
+   SecureVector<byte> sha1_hash = sha1.final();
 
-   md5->update(secret, secret_len);
-   md5->update(sha1_hash);
-   SecureVector<byte> md5_hash = md5->final();
+   md5.update(secret, secret_len);
+   md5.update(sha1_hash);
+   SecureVector<byte> md5_hash = md5.final();
 
    return OctetString(md5_hash, want);
    }
@@ -49,17 +50,17 @@ SecureVector<byte> SSL3_PRF::derive(u32bit key_len,
    if(key_len > 416)
       throw Internal_Error("SSL3_PRF: Requested key length is too large");
 
-   std::auto_ptr<HashFunction> md5(get_hash("MD5"));
-   std::auto_ptr<HashFunction> sha1(get_hash("SHA-1"));
+   MD5 md5;
+   SHA_160 sha1;
 
    OctetString output;
 
    int counter = 0;
    while(key_len)
       {
-      const u32bit produce = std::min(key_len, md5->OUTPUT_LENGTH);
+      const u32bit produce = std::min(key_len, md5.OUTPUT_LENGTH);
 
-      output = output + next_hash(counter++, produce, md5.get(), sha1.get(),
+      output = output + next_hash(counter++, produce, md5, sha1,
                                   secret, secret_len, seed, seed_len);
 
       key_len -= produce;
-- 
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