Changes

59 bytes added ,  17:40, 26 December 2018
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===== 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))
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   // 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)
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     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
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       // 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)
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       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
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       // 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