320 lines
8.1 KiB
Perl
Executable file
320 lines
8.1 KiB
Perl
Executable file
#!/usr/bin/env perl
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#
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# ====================================================================
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# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
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# project. The module is, however, dual licensed under OpenSSL and
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# CRYPTOGAMS licenses depending on where you obtain it. For further
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# details see http://www.openssl.org/~appro/cryptogams/.
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# ====================================================================
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#
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# Poly1305 hash for C64x+.
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#
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# October 2015
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#
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# Performance is [incredible for a 32-bit processor] 1.76 cycles per
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# processed byte. Comparison to compiler-generated code is problematic,
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# because results were observed to vary from 2.1 to 7.6 cpb depending
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# on compiler's ability to inline small functions. Compiler also
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# disables interrupts for some reason, thus making interrupt response
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# time dependent on input length. This module on the other hand is free
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# from such limitation.
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($CTXA,$INPB,$LEN,$PADBIT)=("A4","B4","A6","B6");
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($H0,$H1,$H2,$H3,$H4,$H4a)=("A8","B8","A10","B10","B2",$LEN);
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($D0,$D1,$D2,$D3)= ("A9","B9","A11","B11");
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($R0,$R1,$R2,$R3,$S1,$S2,$S3,$S3b)=("A0","B0","A1","B1","A12","B12","A13","B13");
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($THREE,$R0b,$S2a)=("B7","B5","A5");
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$code.=<<___;
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.text
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.if .ASSEMBLER_VERSION<7000000
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.asg 0,__TI_EABI__
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.endif
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.if __TI_EABI__
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.asg poly1305_init,_poly1305_init
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.asg poly1305_blocks,_poly1305_blocks
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.asg poly1305_emit,_poly1305_emit
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.endif
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.asg B3,RA
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.asg A15,FP
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.asg B15,SP
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.if .LITTLE_ENDIAN
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.asg MV,SWAP2
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.asg MV.L,SWAP4
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.endif
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.global _poly1305_init
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_poly1305_init:
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.asmfunc
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LDNDW *${INPB}[0],B17:B16 ; load key material
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LDNDW *${INPB}[1],A17:A16
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|| ZERO B9:B8
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|| MVK -1,B0
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STDW B9:B8,*${CTXA}[0] ; initialize h1:h0
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|| SHRU B0,4,B0 ; 0x0fffffff
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|| MVK -4,B1
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STDW B9:B8,*${CTXA}[1] ; initialize h3:h2
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|| AND B0,B1,B1 ; 0x0ffffffc
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STW B8,*${CTXA}[4] ; initialize h4
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.if .BIG_ENDIAN
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SWAP2 B16,B17
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|| SWAP2 B17,B16
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SWAP2 A16,A17
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|| SWAP2 A17,A16
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SWAP4 B16,B16
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|| SWAP4 A16,A16
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SWAP4 B17,B17
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|| SWAP4 A17,A17
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.endif
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AND B16,B0,B20 ; r0 = key[0] & 0x0fffffff
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|| AND B17,B1,B22 ; r1 = key[1] & 0x0ffffffc
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|| EXTU B17,4,6,B16 ; r1>>2
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AND A16,B1,B21 ; r2 = key[2] & 0x0ffffffc
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|| AND A17,B1,A23 ; r3 = key[3] & 0x0ffffffc
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|| BNOP RA
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SHRU B21,2,B18
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|| ADD B22,B16,B16 ; s1 = r1 + r1>>2
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STDW B21:B20,*${CTXA}[3] ; save r2:r0
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|| ADD B21,B18,B18 ; s2 = r2 + r2>>2
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|| SHRU A23,2,B17
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|| MV A23,B23
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STDW B23:B22,*${CTXA}[4] ; save r3:r1
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|| ADD B23,B17,B19 ; s3 = r3 + r3>>2
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|| ADD B23,B17,B17 ; s3 = r3 + r3>>2
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STDW B17:B16,*${CTXA}[5] ; save s3:s1
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STDW B19:B18,*${CTXA}[6] ; save s3:s2
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|| ZERO A4 ; return 0
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.endasmfunc
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.global _poly1305_blocks
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.align 32
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_poly1305_blocks:
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.asmfunc stack_usage(40)
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SHRU $LEN,4,A2 ; A2 is loop counter, number of blocks
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[!A2] BNOP RA ; no data
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|| [A2] STW FP,*SP--(40) ; save frame pointer and alloca(40)
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|| [A2] MV SP,FP
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[A2] STDW B13:B12,*SP[4] ; ABI says so
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|| [A2] MV $CTXA,$S3b ; borrow $S3b
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[A2] STDW B11:B10,*SP[3]
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|| [A2] STDW A13:A12,*FP[-3]
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[A2] STDW A11:A10,*FP[-4]
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|| [A2] LDDW *${S3b}[0],B25:B24 ; load h1:h0
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[A2] LDNW *${INPB}++[4],$D0 ; load inp[0]
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[A2] LDNW *${INPB}[-3],$D1 ; load inp[1]
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LDDW *${CTXA}[1],B29:B28 ; load h3:h2, B28 is h2
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LDNW *${INPB}[-2],$D2 ; load inp[2]
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LDNW *${INPB}[-1],$D3 ; load inp[3]
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LDDW *${CTXA}[3],$R2:$R0 ; load r2:r0
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|| LDDW *${S3b}[4],$R3:$R1 ; load r3:r1
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|| SWAP2 $D0,$D0
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LDDW *${CTXA}[5],$S3:$S1 ; load s3:s1
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|| LDDW *${S3b}[6],$S3b:$S2 ; load s3:s2
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|| SWAP4 $D0,$D0
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|| SWAP2 $D1,$D1
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ADDU $D0,B24,$D0:$H0 ; h0+=inp[0]
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|| ADD $D0,B24,B31 ; B-copy of h0+inp[0]
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|| SWAP4 $D1,$D1
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ADDU $D1,B25,$D1:$H1 ; h1+=inp[1]
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|| MVK 3,$THREE
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|| SWAP2 $D2,$D2
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LDW *${CTXA}[4],$H4 ; load h4
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|| SWAP4 $D2,$D2
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|| MV B29,B30 ; B30 is h3
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MV $R0,$R0b
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loop?:
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MPY32U $H0,$R0,A17:A16
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|| MPY32U B31,$R1,B17:B16 ; MPY32U $H0,$R1,B17:B16
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|| ADDU $D0,$D1:$H1,B25:B24 ; ADDU $D0,$D1:$H1,$D1:$H1
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|| ADDU $D2,B28,$D2:$H2 ; h2+=inp[2]
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|| SWAP2 $D3,$D3
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MPY32U $H0,$R2,A19:A18
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|| MPY32U B31,$R3,B19:B18 ; MPY32U $H0,$R3,B19:B18
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|| ADD $D0,$H1,A24 ; A-copy of B24
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|| SWAP4 $D3,$D3
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|| [A2] SUB A2,1,A2 ; decrement loop counter
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MPY32U A24,$S3,A21:A20 ; MPY32U $H1,$S3,A21:A20
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|| MPY32U B24,$R0b,B21:B20 ; MPY32U $H1,$R0,B21:B20
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|| ADDU B25,$D2:$H2,$D2:$H2 ; ADDU $D1,$D2:$H2,$D2:$H2
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|| ADDU $D3,B30,$D3:$H3 ; h3+=inp[3]
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|| ADD B25,$H2,B25 ; B-copy of $H2
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MPY32U A24,$R1,A23:A22 ; MPY32U $H1,$R1,A23:A22
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|| MPY32U B24,$R2,B23:B22 ; MPY32U $H1,$R2,B23:B22
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MPY32U $H2,$S2,A25:A24
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|| MPY32U B25,$S3b,B25:B24 ; MPY32U $H2,$S3,B25:B24
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|| ADDU $D2,$D3:$H3,$D3:$H3
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|| ADD $PADBIT,$H4,$H4 ; h4+=padbit
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MPY32U $H2,$R0,A27:A26
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|| MPY32U $H2,$R1,B27:B26
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|| ADD $D3,$H4,$H4
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|| MV $S2,$S2a
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MPY32U $H3,$S1,A29:A28
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|| MPY32U $H3,$S2,B29:B28
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|| ADD A21,A17,A21 ; start accumulating "d3:d0"
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|| ADD B21,B17,B21
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|| ADDU A20,A16,A17:A16
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|| ADDU B20,B16,B17:B16
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|| [A2] LDNW *${INPB}++[4],$D0 ; load inp[0]
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MPY32U $H3,$S3,A31:A30
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|| MPY32U $H3,$R0b,B31:B30
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|| ADD A23,A19,A23
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|| ADD B23,B19,B23
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|| ADDU A22,A18,A19:A18
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|| ADDU B22,B18,B19:B18
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|| [A2] LDNW *${INPB}[-3],$D1 ; load inp[1]
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MPY32 $H4,$S1,B20
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|| MPY32 $H4,$S2a,A20
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|| ADD A25,A21,A21
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|| ADD B25,B21,B21
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|| ADDU A24,A17:A16,A17:A16
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|| ADDU B24,B17:B16,B17:B16
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|| [A2] LDNW *${INPB}[-2],$D2 ; load inp[2]
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MPY32 $H4,$S3b,B22
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|| ADD A27,A23,A23
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|| ADD B27,B23,B23
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|| ADDU A26,A19:A18,A19:A18
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|| ADDU B26,B19:B18,B19:B18
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|| [A2] LDNW *${INPB}[-1],$D3 ; load inp[3]
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MPY32 $H4,$R0b,$H4
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|| ADD A29,A21,A21 ; final hi("d0")
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|| ADD B29,B21,B21 ; final hi("d1")
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|| ADDU A28,A17:A16,A17:A16 ; final lo("d0")
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|| ADDU B28,B17:B16,B17:B16
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ADD A31,A23,A23 ; final hi("d2")
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|| ADD B31,B23,B23 ; final hi("d3")
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|| ADDU A30,A19:A18,A19:A18
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|| ADDU B30,B19:B18,B19:B18
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ADDU B20,B17:B16,B17:B16 ; final lo("d1")
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|| ADDU A20,A19:A18,A19:A18 ; final lo("d2")
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ADDU B22,B19:B18,B19:B18 ; final lo("d3")
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|| ADD A17,A21,A21 ; "flatten" "d3:d0"
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MV A19,B29 ; move to avoid cross-path stalls
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ADDU A21,B17:B16,B27:B26 ; B26 is h1
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ADD B21,B27,B27
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|| DMV B29,A18,B29:B28 ; move to avoid cross-path stalls
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ADDU B27,B29:B28,B29:B28 ; B28 is h2
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|| [A2] SWAP2 $D0,$D0
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ADD A23,B29,B29
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|| [A2] SWAP4 $D0,$D0
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ADDU B29,B19:B18,B31:B30 ; B30 is h3
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ADD B23,B31,B31
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|| MV A16,B24 ; B24 is h0
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|| [A2] SWAP2 $D1,$D1
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ADD B31,$H4,$H4
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|| [A2] SWAP4 $D1,$D1
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SHRU $H4,2,B16 ; last reduction step
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|| AND $H4,$THREE,$H4
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|| [A2] BNOP loop?
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ADDAW B16,B16,B16 ; 5*(h4>>2)
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ADDU B24,B16,B25:B24 ; B24 is h0
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|| [A2] SWAP2 $D2,$D2
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ADDU B26,B25,B27:B26 ; B26 is h1
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|| [A2] SWAP4 $D2,$D2
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ADDU B28,B27,B29:B28 ; B28 is h2
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|| [A2] ADDU $D0,B24,$D0:$H0 ; h0+=inp[0]
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|| [A2] ADD $D0,B24,B31 ; B-copy of h0+inp[0]
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ADD B30,B29,B30 ; B30 is h3
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|| [A2] ADDU $D1,B26,$D1:$H1 ; h1+=inp[1]
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;;===== branch to loop? is taken here
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LDDW *FP[-4],A11:A10 ; ABI says so
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LDDW *FP[-3],A13:A12
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|| LDDW *SP[3],B11:B10
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LDDW *SP[4],B13:B12
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|| MV B26,B25
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|| BNOP RA
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LDW *++SP(40),FP ; restore frame pointer
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|| MV B30,B29
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STDW B25:B24,*${CTXA}[0] ; save h1:h0
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STDW B29:B28,*${CTXA}[1] ; save h3:h2
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STW $H4,*${CTXA}[4] ; save h4
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NOP 1
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.endasmfunc
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___
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{
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my ($MAC,$NONCEA,$NONCEB)=($INPB,$LEN,$PADBIT);
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$code.=<<___;
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.global _poly1305_emit
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.align 32
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_poly1305_emit:
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.asmfunc
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LDDW *${CTXA}[0],A17:A16 ; load h1:h0
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LDDW *${CTXA}[1],A19:A18 ; load h3:h2
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LDW *${CTXA}[4],A20 ; load h4
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MV $NONCEA,$NONCEB
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MVK 5,A22 ; compare to modulus
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ADDU A16,A22,A23:A22
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|| LDW *${NONCEA}[0],A8
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|| LDW *${NONCEB}[1],B8
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ADDU A17,A23,A25:A24
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|| LDW *${NONCEA}[2],A9
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|| LDW *${NONCEB}[3],B9
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ADDU A19,A25,A27:A26
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ADDU A19,A27,A29:A28
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ADD A20,A29,A29
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SHRU A29,2,A2 ; check for overflow in 130-th bit
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[A2] MV A22,A16 ; select
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|| [A2] MV A24,A17
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[A2] MV A26,A18
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|| [A2] MV A28,A19
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|| ADDU A8,A16,A23:A22 ; accumulate nonce
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ADDU B8,A17,A25:A24
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|| SWAP2 A22,A22
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ADDU A23,A25:A24,A25:A24
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ADDU A9,A18,A27:A26
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|| SWAP2 A24,A24
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ADDU A25,A27:A26,A27:A26
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|| ADD B9,A19,A28
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ADD A27,A28,A28
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|| SWAP2 A26,A26
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.if .BIG_ENDIAN
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SWAP2 A28,A28
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|| SWAP4 A22,A22
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|| SWAP4 A24,B24
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SWAP4 A26,A26
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SWAP4 A28,A28
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|| MV B24,A24
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.endif
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BNOP RA,1
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STNW A22,*${MAC}[0] ; write the result
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STNW A24,*${MAC}[1]
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STNW A26,*${MAC}[2]
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STNW A28,*${MAC}[3]
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.endasmfunc
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___
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}
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$code.=<<___;
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.sect .const
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.cstring "Poly1305 for C64x+, CRYPTOGAMS by <appro\@openssl.org>"
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.align 4
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___
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print $code;
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