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keccak.asm
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keccak.asm
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; Keccak 256 cryptographic hash for Zilog Z80 processors
; Written by Daniel A. Nagy <nagydani@epointsystem.org> in 2019
; Init
; Pollutes: BC,DE,HL
KECCAKI:CALL KECCAKQ
LD E,L
LD D,H
INC DE
LD (HL),0
LD BC,199
LDIR
RET
; Update
; In: A next byte to hash
; Pollutes: AF, AF', BC, BC', DE, DE', HL, HL', IX
KECCAKU:LD HL,(KECCAKP)
XOR (HL)
LD (HL),A
LD A,L
INC A
CP KECCAKS - 0x100 * (KECCAKS / 0x100) + 0x88
LD (KECCAKP),A
RET C
CALL KECCAKF
KECCAKQ:LD HL,KECCAKS
LD (KECCAKP),HL
RET
; Squeeze
; Out: A next byte from PRNG
; Pollutes: AF, AF', BC, BC', DE, DE', HL, HL', IX
KECCAKR:LD HL,(KECCAKP)
LD A,L
CP KECCAKS - 0x100 * (KECCAKS / 0x100) + 0x87
LD A,(HL)
JR NC,KECCAKO
INC HL
LD (KECCAKP),HL
RET
KECCAKO:PUSH AF
CALL KECCAKF
CALL KECCAKQ
POP AF
RET
; Finalize
; Out: hash value beginning at KECCAKS
; Pollutes: AF, AF', BC, BC', DE, DE', HL, HL', IX
KECCAK: LD HL,(KECCAKP)
LD H,KECCAKS / 0x100
LD A,1
XOR (HL)
LD (HL),A
LD A,(KECCAKS + 0x87)
XOR 0x80
LD (KECCAKS + 0x87),A
CALL KECCAKQ
; Shuffle
KECCAKF:LD B,24
KECCAKL:PUSH BC
; Theta
THETA: LD HL,KECCAKB
LD IX,KECCAKS+100
LD B,40
THETAL1:LD A,(IX-100)
XOR (IX-60)
XOR (IX-20)
XOR (IX+20)
XOR (IX+60)
LD (HL),A
INC L
DEFB 0xDD
INC L ; INC IXL
DJNZ THETAL1
LD D,H
LD B,5
XOR A
THETAL2:ADD A,A
ADD A,A
ADD A,A
LD L,A
LD E,40
LD C,E ; Prevent LDI from decrementing B
LDI
LDI
LDI
LDI
LDI
LDI
LDI
LDI
LD L,KECCAKB - 0x100 * (KECCAKB / 0x100) + 47
LD A,(HL)
ADD A,A
LD L,KECCAKB - 0x100 * (KECCAKB / 0x100) + 40
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
THETAR: LD A,B
SUB 2
JP P,THETAP
LD A,4
THETAP: ADD A,A
ADD A,A
ADD A,A
LD E,A
LD L,KECCAKB - 0x100 * (KECCAKB / 0x100) + 40
LD C,B
LD B,8
THETALX:LD A,(DE)
XOR (HL)
LD (HL),A
INC L
INC E
DJNZ THETALX
LD B,8
THETAL3:DEFB 0xDD
DEC L ; DEC IXL
DEC L
LD E,(HL)
LD A,(IX-100)
XOR E
LD (IX-100),A
LD A,(IX-60)
XOR E
LD (IX-60),A
LD A,(IX-20)
XOR E
LD (IX-20),A
LD A,(IX+20)
XOR E
LD (IX+20),A
LD A,(IX+60)
XOR E
LD (IX+60),A
DJNZ THETAL3
LD B,C
DEC B
LD A,B
JR NZ,THETAL2
; Rho & Pi
RHOPI: LD L,KECCAKS - 0x100 * (KECCAKS/0x100) + 8
LD E,B
LD C,8
LDIR
EXX
LD HL,RHOPIT - RHOPITE
LD BC,RHOPITE - RHOPIT
ADD HL,SP
LD SP,HL
EX DE,HL
LD HL,RHOPIT
LDIR ; Stack RHOPIT
RHOPIL: EXX
POP HL ; Pi table lookup
LDI
LDI
LDI
LDI
LDI
LDI
LDI
LDI
EXX
RET ; Rho table lookup
RHOPIR: DEFB 0x3E ; LD A,x
XOR A
EXX
EX DE,HL
LD L,7
DEC E
LDD
LDD
LDD
LDD
LDD
LDD
LDD
LDD
LD DE,KECCAKB
LD HL,KECCAKB+8
LDI
LDI
LDI
LDI
LDI
LDI
LDI
LDI
EXX
OR A
JR NZ,RHOPIL
; Chi
CHI: LD L,KECCAKS - 0x100 * (KECCAKS/0x100) - 40
LD B,5
CHIL0: PUSH BC
LD E,KECCAKB - 0x100 * (KECCAKB/0x100)
LD BC,40
ADD HL,BC
LDIR
LD IX,KECCAKB + 40 ; Same as DE, but it is faster this way
LD B,8
CHIL3: DEC L
DEFB 0xDD
DEC L ; DEC IXL
LD A,(IX - 0x20)
CPL
AND (IX - 0x18)
XOR (HL)
LD (HL),A
DJNZ CHIL3
LD B,8
CHIL2: DEC L
DEFB 0xDD
DEC L ; DEC IXL
LD A,(IX + 0x08)
CPL
AND (IX - 0x18)
XOR (HL)
LD (HL),A
DJNZ CHIL2
LD B,24
CHIL1: DEC L
DEFB 0xDD
DEC L ; DEC IXL
LD A,(IX + 0x08)
CPL
AND (IX + 0x10)
XOR (HL)
LD (HL),A
DJNZ CHIL1
POP BC
DJNZ CHIL0
; Iota
IOTA: LD D,KECCAKS / 0x100
POP BC
LD A,B
ADD A,A
ADD A,A
LD L,A ; E = B * 4
LD H,IOTAT / 0x100
LD E,KECCAKS - 0x100 * (KECCAKS / 0x100) + 7
LD A,(DE)
XOR (HL)
LD (DE),A
INC L
LD E,KECCAKS - 0x100 * (KECCAKS / 0x100) + 3
LD A,(DE)
XOR (HL)
LD (DE),A
INC L
LD E,KECCAKS - 0x100 * (KECCAKS / 0x100) + 1
LD A,(DE)
XOR (HL)
LD (DE),A
INC L
LD E,KECCAKS - 0x100 * (KECCAKS / 0x100) + 0
LD A,(DE)
XOR (HL)
LD (DE),A
DEC B
JP NZ,KECCAKL
RET
; Cyclic 64 bit rotation helper functions
; Pollutes: AF, AF', BC, DE, HL
ROTL18: CALL ROTL16 ; 16 + 1 + 1
JR ROTL2
ROTL6: CALL ROTL4 ; 4 + 1 + 1
ROTL2: CALL ROTL1 ; 1 + 1
ROTL1: LD HL,KECCAKB
SLA (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
INC L
RL (HL)
LD L,0
RET NC
SET 0,(HL)
RET
ROTL14: CALL ROTL16 ; 16 - 1 - 1
ROTL62: CALL ROTR1 ; 64 - 1 - 1
ROTR1: LD A,(KECCAKB)
RRA
LD HL,KECCAKB+7
RR (HL)
DEC L
RR (HL)
DEC L
RR (HL)
DEC L
RR (HL)
DEC L
RR (HL)
DEC L
RR (HL)
DEC L
RR (HL)
DEC L
RR (HL)
RET
ROTL27: CALL ROTL24 ; 24 + 4 - 1
ROTL3: CALL ROTR1 ; 4 - 1
ROTL4: LD HL,KECCAKB
XOR A
RLD
INC L
RLD
INC L
RLD
INC L
RLD
INC L
RLD
INC L
RLD
INC L
RLD
INC L
RLD
LD L,0
OR (HL)
LD (HL),A
RET
ROTL61: CALL ROTL1 ; 64 - 4 + 1
ROTR4: LD A,(KECCAKB)
LD HL,KECCAKB+7
RRD
DEC L
RRD
DEC L
RRD
DEC L
RRD
DEC L
RRD
DEC L
RRD
DEC L
RRD
DEC L
RRD
RET
ROTL10: CALL ROTL2 ; 8 + 1 + 1
ROTL8: LD HL,KECCAKB+7
LD E,L
LD D,H
LD A,(HL)
DEC L
LDD ; Faster than LDDR
LDD
LDD
LDD
LDD
LDD
LDD
LD (DE),A
RET
ROTL55: CALL ROTR1 ; 64 - 8 - 1
ROTL56: EQU $ ; 64 - 8
ROTR8: LD HL,KECCAKB
LD A,(HL)
LD E,L
LD D,H
INC L
LDI
LDI
LDI
LDI
LDI
LDI
LDI
LD (DE),A
RET
ROTL15: CALL ROTR1 ; 16 - 1
JR ROTL16
ROTL21: CALL ROTL1 ; 16 + 4 + 1
ROTL20: CALL ROTL4 ; 16 + 4
ROTL16: LD HL,KECCAKB+7
LD C,0xFF
LD E,L
LD D,H
LD A,(HL)
DEC L
LD B,(HL)
DEC L
LDD
LDD
LDD
LDD
LDD
LDD
LD L,E
LD H,D
LD (HL),A
DEC L
LD (HL),B
RET
ROTL43: CALL ROTR1 ; 64 - 16 - 4 - 1
JR ROTL44
ROTL45: CALL ROTL1 ; 64 - 16 - 4 + 1
ROTL44: CALL ROTR4 ; 64 - 16 - 4
ROTR16: LD HL,KECCAKB
LD C,0xFF
LD A,(HL)
LD E,L
LD D,H
INC L
LD B,(HL)
INC L
LDI
LDI
LDI
LDI
LDI
LDI
LD L,E
LD (HL),A
INC L
LD (HL),B
RET
ROTL25: CALL ROTL1 ; 24 + 1
JR ROTL24
ROTL28: CALL ROTL4 ; 24 + 4
ROTL24: LD HL,KECCAKB+7
LD C,0xFF
LD E,L
LD D,H
LD A,(HL)
DEC L
EX AF,AF'
LD A,(HL)
DEC L
LD B,(HL)
DEC L
LDD
LDD
LDD
LDD
LDD
LD L,E
LD H,D
EX AF,AF'
LD (HL),A
DEC L
EX AF,AF'
LD (HL),A
DEC L
LD (HL),B
RET
ROTL39: CALL ROTR1 ; 64 - 24 - 1
JR ROTR24
ROTL41: CALL ROTL1 ; 64 - 24 + 1
ROTR24: LD HL,KECCAKB
LD C,0xFF
LD A,(HL)
LD E,L
LD D,H
INC L
EX AF,AF'
LD A,(HL)
INC L
LD B,(HL)
INC L
LDI
LDI
LDI
LDI
LDI
LD L,E
EX AF,AF'
LD (HL),A
INC L
EX AF,AF'
LD (HL),A
INC L
LD (HL),B
RET
ROTL36: CALL ROTL4 ; 32 + 4
ROT32: LD HL,KECCAKB
LD DE,KECCAKB+4
LD A,(DE)
LDI
DEC L
LD (HL),A
INC L
LD A,(DE)
LDI
DEC L
LD (HL),A
INC L
LD A,(DE)
LDI
DEC L
LD (HL),A
INC L
LD A,(DE)
LDI
DEC L
LD (HL),A
RET
RHOPIT: DEFW KECCAKS + 10 * 8
DEFW ROTL1,RHOPIR
DEFW KECCAKS + 7 * 8
DEFW ROTL3,RHOPIR
DEFW KECCAKS + 11 * 8
DEFW ROTL6,RHOPIR
DEFW KECCAKS + 17 * 8
DEFW ROTL10,RHOPIR
DEFW KECCAKS + 18 * 8
DEFW ROTL15,RHOPIR
DEFW KECCAKS + 3 * 8
DEFW ROTL21,RHOPIR
DEFW KECCAKS + 5 * 8
DEFW ROTL28,RHOPIR
DEFW KECCAKS + 16 * 8
DEFW ROTL36,RHOPIR
DEFW KECCAKS + 8 * 8
DEFW ROTL45,RHOPIR
DEFW KECCAKS + 21 * 8
DEFW ROTL55,RHOPIR
DEFW KECCAKS + 24 * 8
DEFW ROTL2,RHOPIR
DEFW KECCAKS + 4 * 8
DEFW ROTL14,RHOPIR
DEFW KECCAKS + 15 * 8
DEFW ROTL27,RHOPIR
DEFW KECCAKS + 23 * 8
DEFW ROTL41,RHOPIR
DEFW KECCAKS + 19 * 8
DEFW ROTL56,RHOPIR
DEFW KECCAKS + 13 * 8
DEFW ROTL8,RHOPIR
DEFW KECCAKS + 12 * 8
DEFW ROTL25,RHOPIR
DEFW KECCAKS + 2 * 8
DEFW ROTL43,RHOPIR
DEFW KECCAKS + 20 * 8
DEFW ROTL62,RHOPIR
DEFW KECCAKS + 14 * 8
DEFW ROTL18,RHOPIR
DEFW KECCAKS + 22 * 8
DEFW ROTL39,RHOPIR
DEFW KECCAKS + 9 * 8
DEFW ROTL61,RHOPIR
DEFW KECCAKS + 6 * 8
DEFW ROTL20,RHOPIR
DEFW KECCAKS + 1 * 8
DEFW ROTL44,RHOPIR+1
RHOPITE:EQU $