Modularize EMSA

1 files changed, 0 insertions, 144 deletions

diff --git a/src/emsa4.cpp b/src/emsa4.cpp
deleted file mode 100644
index 6fb63fe0a..000000000
--- a/src/emsa4.cpp
+++ /dev/null
@@ -1,144 +0,0 @@
-/*************************************************
-* EMSA4 Source File                              *
-* (C) 1999-2007 Jack Lloyd                       *
-*************************************************/
-
-#include <botan/emsa.h>
-#include <botan/lookup.h>
-#include <botan/look_pk.h>
-#include <botan/bit_ops.h>
-
-namespace Botan {
-
-/*************************************************
-* EMSA4 Update Operation                         *
-*************************************************/
-void EMSA4::update(const byte input[], u32bit length)
-   {
-   hash->update(input, length);
-   }
-
-/*************************************************
-* Return the raw (unencoded) data                *
-*************************************************/
-SecureVector<byte> EMSA4::raw_data()
-   {
-   return hash->final();
-   }
-
-/*************************************************
-* EMSA4 Encode Operation                         *
-*************************************************/
-SecureVector<byte> EMSA4::encoding_of(const MemoryRegion<byte>& msg,
-                                      u32bit output_bits,
-                                      RandomNumberGenerator& rng)
-   {
-   const u32bit HASH_SIZE = hash->OUTPUT_LENGTH;
-
-   if(msg.size() != HASH_SIZE)
-      throw Encoding_Error("EMSA4::encoding_of: Bad input length");
-   if(output_bits < 8*HASH_SIZE + 8*SALT_SIZE + 9)
-      throw Encoding_Error("EMSA4::encoding_of: Output length is too small");
-
-   const u32bit output_length = (output_bits + 7) / 8;
-
-   SecureVector<byte> salt(SALT_SIZE);
-   rng.randomize(salt, SALT_SIZE);
-
-   for(u32bit j = 0; j != 8; ++j)
-      hash->update(0);
-   hash->update(msg);
-   hash->update(salt, SALT_SIZE);
-   SecureVector<byte> H = hash->final();
-
-   SecureVector<byte> EM(output_length);
-
-   EM[output_length - HASH_SIZE - SALT_SIZE - 2] = 0x01;
-   EM.copy(output_length - 1 - HASH_SIZE - SALT_SIZE, salt, SALT_SIZE);
-   mgf->mask(H, HASH_SIZE, EM, output_length - HASH_SIZE - 1);
-   EM[0] &= 0xFF >> (8 * ((output_bits + 7) / 8) - output_bits);
-   EM.copy(output_length - 1 - HASH_SIZE, H, HASH_SIZE);
-   EM[output_length-1] = 0xBC;
-
-   return EM;
-   }
-
-/*************************************************
-* EMSA4 Decode/Verify Operation                  *
-*************************************************/
-bool EMSA4::verify(const MemoryRegion<byte>& const_coded,
-                   const MemoryRegion<byte>& raw, u32bit key_bits) throw()
-   {
-   const u32bit HASH_SIZE = hash->OUTPUT_LENGTH;
-   const u32bit KEY_BYTES = (key_bits + 7) / 8;
-
-   if(key_bits < 8*HASH_SIZE + 9)
-      return false;
-   if(raw.size() != HASH_SIZE)
-      return false;
-   if(const_coded.size() > KEY_BYTES)
-      return false;
-   if(const_coded[const_coded.size()-1] != 0xBC)
-      return false;
-
-   SecureVector<byte> coded = const_coded;
-   if(coded.size() < KEY_BYTES)
-      {
-      SecureVector<byte> temp(KEY_BYTES);
-      temp.copy(KEY_BYTES - coded.size(), coded, coded.size());
-      coded = temp;
-      }
-
-   const u32bit TOP_BITS = 8 * ((key_bits + 7) / 8) - key_bits;
-   if(TOP_BITS > 8 - high_bit(coded[0]))
-      return false;
-
-   SecureVector<byte> DB(coded.begin(), coded.size() - HASH_SIZE - 1);
-   SecureVector<byte> H(coded + coded.size() - HASH_SIZE - 1, HASH_SIZE);
-
-   mgf->mask(H, H.size(), DB, coded.size() - H.size() - 1);
-   DB[0] &= 0xFF >> TOP_BITS;
-
-   u32bit salt_offset = 0;
-   for(u32bit j = 0; j != DB.size(); ++j)
-      {
-      if(DB[j] == 0x01)
-         { salt_offset = j + 1; break; }
-      if(DB[j])
-         return false;
-      }
-   if(salt_offset == 0)
-      return false;
-
-   SecureVector<byte> salt(DB + salt_offset, DB.size() - salt_offset);
-
-   for(u32bit j = 0; j != 8; ++j)
-      hash->update(0);
-   hash->update(raw);
-   hash->update(salt);
-   SecureVector<byte> H2 = hash->final();
-
-   return (H == H2);
-   }
-
-/*************************************************
-* EMSA4 Constructor                              *
-*************************************************/
-EMSA4::EMSA4(const std::string& hash_name, const std::string& mgf_name) :
-   SALT_SIZE(output_length_of(hash_name))
-   {
-   hash = get_hash(hash_name);
-   mgf = get_mgf(mgf_name + "(" + hash_name + ")");
-   }
-
-/*************************************************
-* EMSA4 Constructor                              *
-*************************************************/
-EMSA4::EMSA4(const std::string& hash_name, const std::string& mgf_name,
-             u32bit salt_size) : SALT_SIZE(salt_size)
-   {
-   hash = get_hash(hash_name);
-   mgf = get_mgf(mgf_name + "(" + hash_name + ")");
-   }
-
-}