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[/] [eco32/] [trunk/] [fp/] [implementation/] [mmix/] [crypto.mms] - Blame information for rev 200

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Line No. Rev Author Line
1 15 hellwig
* Cryptanalysis Problem (CLASSIFIED)
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a GREG
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b GREG
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c GREG
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t GREG
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x GREG
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y GREG
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       LOC Data_Segment
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count  GREG @           Base address for wyde counts
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       LOC @+8*(1<<16)  Space for the wyde frequencies
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freq   GREG @           Base address for byte counts
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       LOC @+8*(1<<8)   Space for the byte frequencies
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p      GREG @
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       BYTE "abracadabraa",0,"abc" Trivial test data
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ones   GREG #0101010101010101
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       LOC  #100
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2H     SRU  b,a,45      Isolate next wyde.
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       LDO  c,count,b   Load old count.
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       INCL c,1
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       STO  c,count,b   Store new count.
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       SLU  a,a,16      Delete one wyde.
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       PBNZ a,2B        Done with octabyte? \bracetext...
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Phase1 LDOU a,p,0       Start here: Fetch the next eight bytes.
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       INCL p,8
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       BDIF t,ones,a    Test if there's a zero byte.
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       PBZ  t,2B        Do main loop, unless near the end.
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2H     SRU  b,a,45      Isolate next wyde.
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       LDO  c,count,b   Load old count.
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       INCL c,1
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       STO  c,count,b   Store new count.
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       SRU  b,t,48
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       SLU  a,a,16
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       BDIF t,ones,a
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       PBZ  b,2B        Continue unless done.
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Phase2 SET  p,8*255     1
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1H     SL   a,p,8       255
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       LDA  a,count,a   255      $\.a\gets{}$address of row \.p
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       SET  b,8*255     255
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       LDO  c,a,0       255
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       SET  t,p         255
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2H     INCL t,#800      255*255
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       LDO  x,count,t   255*255  Element of column \.p
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       LDO  y,a,b       255*255  Element of row \.p
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       ADD  c,c,x       255*255
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       ADD  c,c,y       255*255
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       SUB  b,b,8       255*255
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       PBP  b,2B        255*255
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       STO  c,freq,p    255
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       SUB  p,p,8       255
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       PBP  p,1B        255
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       POP
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Main   IS   Phase1
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