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.text .globl ChaCha20_ctr32 .type ChaCha20_ctr32,@function .align 32 ChaCha20_ctr32: ltr %r4,%r4 # %r4==0? bzr %r14 ahi %r4,-64 lhi %r1,-176 stm %r6,%r15,24(%r15) slr %r2,%r3 # difference la %r4,0(%r3,%r4) # end of input minus 64 larl %r7,.Lsigma lgr %r0,%r15 la %r15,0(%r1,%r15) st %r0,0(%r15) lmg %r8,%r11,0(%r5) # load key lmg %r12,%r13,0(%r6) # load counter lmg %r6,%r7,0(%r7) # load sigma constant la %r14,0(%r3) st %r2,176+3*4(%r15) st %r4,176+4*4(%r15) stmg %r6,%r13,96(%r15) # copy key schedule to stack srlg %r10,%r12,32 # 32-bit counter value j .Loop_outer .align 16 .Loop_outer: lm %r0,%r7,96+4*0(%r15) # load x[0]-x[7] lm %r8,%r9,96+4*10(%r15) # load x[10]-x[11] lm %r11,%r13,96+4*13(%r15) # load x[13]-x[15] stm %r8,%r9,96+4*8+4*10(%r15) # offload x[10]-x[11] lm %r8,%r9,96+4*8(%r15) # load x[8]-x[9] st %r10,96+4*12(%r15) # save counter st %r14,176+2*4(%r15) # save input pointer lhi %r14,10 j .Loop .align 4 .Loop: alr %r0,%r4 alr %r1,%r5 xr %r10,%r0 xr %r11,%r1 rll %r10,%r10,16 rll %r11,%r11,16 alr %r8,%r10 alr %r9,%r11 xr %r4,%r8 xr %r5,%r9 rll %r4,%r4,12 rll %r5,%r5,12 alr %r0,%r4 alr %r1,%r5 xr %r10,%r0 xr %r11,%r1 rll %r10,%r10,8 rll %r11,%r11,8 alr %r8,%r10 alr %r9,%r11 xr %r4,%r8 xr %r5,%r9 rll %r4,%r4,7 rll %r5,%r5,7 stm %r8,%r9,96+4*8+4*8(%r15) lm %r8,%r9,96+4*8+4*10(%r15) alr %r2,%r6 alr %r3,%r7 xr %r12,%r2 xr %r13,%r3 rll %r12,%r12,16 rll %r13,%r13,16 alr %r8,%r12 alr %r9,%r13 xr %r6,%r8 xr %r7,%r9 rll %r6,%r6,12 rll %r7,%r7,12 alr %r2,%r6 alr %r3,%r7 xr %r12,%r2 xr %r13,%r3 rll %r12,%r12,8 rll %r13,%r13,8 alr %r8,%r12 alr %r9,%r13 xr %r6,%r8 xr %r7,%r9 rll %r6,%r6,7 rll %r7,%r7,7 alr %r0,%r5 alr %r1,%r6 xr %r13,%r0 xr %r10,%r1 rll %r13,%r13,16 rll %r10,%r10,16 alr %r8,%r13 alr %r9,%r10 xr %r5,%r8 xr %r6,%r9 rll %r5,%r5,12 rll %r6,%r6,12 alr %r0,%r5 alr %r1,%r6 xr %r13,%r0 xr %r10,%r1 rll %r13,%r13,8 rll %r10,%r10,8 alr %r8,%r13 alr %r9,%r10 xr %r5,%r8 xr %r6,%r9 rll %r5,%r5,7 rll %r6,%r6,7 stm %r8,%r9,96+4*8+4*10(%r15) lm %r8,%r9,96+4*8+4*8(%r15) alr %r2,%r7 alr %r3,%r4 xr %r11,%r2 xr %r12,%r3 rll %r11,%r11,16 rll %r12,%r12,16 alr %r8,%r11 alr %r9,%r12 xr %r7,%r8 xr %r4,%r9 rll %r7,%r7,12 rll %r4,%r4,12 alr %r2,%r7 alr %r3,%r4 xr %r11,%r2 xr %r12,%r3 rll %r11,%r11,8 rll %r12,%r12,8 alr %r8,%r11 alr %r9,%r12 xr %r7,%r8 xr %r4,%r9 rll %r7,%r7,7 rll %r4,%r4,7 brct %r14,.Loop l %r14,176+2*4(%r15) # pull input pointer stm %r8,%r9,96+4*8+4*8(%r15) # offload x[8]-x[9] lm %r8,%r9,176+3*4(%r15) al %r0,96+4*0(%r15) # accumulate key schedule al %r1,96+4*1(%r15) al %r2,96+4*2(%r15) al %r3,96+4*3(%r15) al %r4,96+4*4(%r15) al %r5,96+4*5(%r15) al %r6,96+4*6(%r15) al %r7,96+4*7(%r15) lrvr %r0,%r0 lrvr %r1,%r1 lrvr %r2,%r2 lrvr %r3,%r3 lrvr %r4,%r4 lrvr %r5,%r5 lrvr %r6,%r6 lrvr %r7,%r7 al %r10,96+4*12(%r15) al %r11,96+4*13(%r15) al %r12,96+4*14(%r15) al %r13,96+4*15(%r15) lrvr %r10,%r10 lrvr %r11,%r11 lrvr %r12,%r12 lrvr %r13,%r13 la %r8,0(%r8,%r14) # reconstruct output pointer clr %r14,%r9 jh .Ltail x %r0,4*0(%r14) # xor with input x %r1,4*1(%r14) st %r0,4*0(%r8) # store output x %r2,4*2(%r14) st %r1,4*1(%r8) x %r3,4*3(%r14) st %r2,4*2(%r8) x %r4,4*4(%r14) st %r3,4*3(%r8) lm %r0,%r3,96+4*8+4*8(%r15) # load x[8]-x[11] x %r5,4*5(%r14) st %r4,4*4(%r8) x %r6,4*6(%r14) al %r0,96+4*8(%r15) st %r5,4*5(%r8) x %r7,4*7(%r14) al %r1,96+4*9(%r15) st %r6,4*6(%r8) x %r10,4*12(%r14) al %r2,96+4*10(%r15) st %r7,4*7(%r8) x %r11,4*13(%r14) al %r3,96+4*11(%r15) st %r10,4*12(%r8) x %r12,4*14(%r14) st %r11,4*13(%r8) x %r13,4*15(%r14) st %r12,4*14(%r8) lrvr %r0,%r0 st %r13,4*15(%r8) lrvr %r1,%r1 lrvr %r2,%r2 lrvr %r3,%r3 lhi %r10,1 x %r0,4*8(%r14) al %r10,96+4*12(%r15) # increment counter x %r1,4*9(%r14) st %r0,4*8(%r8) x %r2,4*10(%r14) st %r1,4*9(%r8) x %r3,4*11(%r14) st %r2,4*10(%r8) st %r3,4*11(%r8) clr %r14,%r9 # done yet? la %r14,64(%r14) jl .Loop_outer .Ldone: xgr %r0,%r0 xgr %r1,%r1 xgr %r2,%r2 xgr %r3,%r3 stmg %r0,%r3,96+4*4(%r15) # wipe key copy stmg %r0,%r3,96+4*12(%r15) lm %r6,%r15,200(%r15) br %r14 .align 16 .Ltail: la %r9,64(%r9) stm %r0,%r7,96+4*0(%r15) slr %r9,%r14 lm %r0,%r3,96+4*8+4*8(%r15) lhi %r6,0 stm %r10,%r13,96+4*12(%r15) al %r0,96+4*8(%r15) al %r1,96+4*9(%r15) al %r2,96+4*10(%r15) al %r3,96+4*11(%r15) lrvr %r0,%r0 lrvr %r1,%r1 lrvr %r2,%r2 lrvr %r3,%r3 stm %r0,%r3,96+4*8(%r15) .Loop_tail: llgc %r4,0(%r6,%r14) llgc %r5,96(%r6,%r15) xr %r5,%r4 stc %r5,0(%r6,%r8) la %r6,1(%r6) brct %r9,.Loop_tail j .Ldone .size ChaCha20_ctr32,.-ChaCha20_ctr32 .align 32 .Lsigma: .long 0x61707865,0x3320646e,0x79622d32,0x6b206574 # endian-neutral .asciz "ChaCha20 for s390x, CRYPTOGAMS by <appro@openssl.org>" .align 4