Changes

===== do_crypto =====

===== do_crypto =====

This is the method responsible for all crypto operations performed during [[#KeygenLdr|KeygenLdr]]. It takes '''src_addr''', '''src_size''', '''iv_addr''', '''dst_addr''', '''mode''' and '''crypt_ver''' as arguments.

This is the method responsible for all crypto operations performed during [[#KeygenLdr|KeygenLdr]]. It takes '''src_addr''', '''src_size''', '''iv_addr''', '''dst_addr''', '''mode''' and '''use_imem''' as arguments.

  // Check for invalid source data size

  // Check for invalid source data size

  if (!src_size || (src_size & 0x0F))

  if (!src_size || (src_size & 0x0F))

   // The next xfer instruction will be overridden

   // The next xfer instruction will be overridden

   // and target changes from DMA to crypto input/output stream

   // and target changes from DMA to crypto input/output stream

   if (crypt_ver == 0x01)

   if (use_imem)

     cxset(0xA1);        // Flag 0xA0 is (0x80 | 0x20)

     cxset(0xA1);        // Flag 0xA0 is falcon imem <-> crypto input/output stream

   else

   else

     cxset(0x21);        // Flag 0x20 is external mem <-> crypto input/output stream

     cxset(0x21);        // Flag 0x20 is external mem <-> crypto input/output stream

       // The next xfer instruction will be overridden

       // The next xfer instruction will be overridden

       // and target changes from DMA to crypto input/output stream

       // and target changes from DMA to crypto input/output stream

       if (crypt_ver == 0x01)

       if (use_imem)

         cxset(0xA1);    // Flag 0xA0 is (0x80 | 0x20)

         cxset(0xA1);    // Flag 0xA0 is falcon imem <-> crypto input/output stream

       else

       else

         cxset(0x21);    // Flag 0x20 is external mem <-> crypto input/output stream

         cxset(0x21);    // Flag 0x20 is external mem <-> crypto input/output stream

       // The next 2 xfer instructions will be overridden

       // The next 2 xfer instructions will be overridden

       // and target changes from DMA to crypto input/output stream

       // and target changes from DMA to crypto input/output stream

       if (crypt_ver == 0x01)

       if (use_imem)

         cxset(0xA2);            // Flag 0xA0 is (0x80 | 0x20)

         cxset(0xA2);            // Flag 0xA0 is falcon imem <-> crypto input/output stream

       else

       else

         cxset(0x22);            // Flag 0x20 is external mem <-> crypto input/output stream

         cxset(0x22);            // Flag 0x20 is external mem <-> crypto input/output stream