| #include "arm_arch.h" |
| |
| .text |
| .arch armv8-a+crypto |
| .global gcm_init_v8 |
| .type gcm_init_v8,%function |
| .align 4 |
| gcm_init_v8: |
| ld1 {v17.2d},[x1] //load H |
| movi v16.16b,#0xe1 |
| ext v3.16b,v17.16b,v17.16b,#8 |
| shl v16.2d,v16.2d,#57 |
| ushr v18.2d,v16.2d,#63 |
| ext v16.16b,v18.16b,v16.16b,#8 //t0=0xc2....01 |
| dup v17.4s,v17.s[1] |
| ushr v19.2d,v3.2d,#63 |
| sshr v17.4s,v17.4s,#31 //broadcast carry bit |
| and v19.16b,v19.16b,v16.16b |
| shl v3.2d,v3.2d,#1 |
| ext v19.16b,v19.16b,v19.16b,#8 |
| and v16.16b,v16.16b,v17.16b |
| orr v3.16b,v3.16b,v19.16b //H<<<=1 |
| eor v3.16b,v3.16b,v16.16b //twisted H |
| st1 {v3.2d},[x0] |
| |
| ret |
| .size gcm_init_v8,.-gcm_init_v8 |
| |
| .global gcm_gmult_v8 |
| .type gcm_gmult_v8,%function |
| .align 4 |
| gcm_gmult_v8: |
| ld1 {v17.2d},[x0] //load Xi |
| movi v19.16b,#0xe1 |
| ld1 {v20.2d},[x1] //load twisted H |
| shl v19.2d,v19.2d,#57 |
| #ifndef __ARMEB__ |
| rev64 v17.16b,v17.16b |
| #endif |
| ext v21.16b,v20.16b,v20.16b,#8 |
| mov x3,#0 |
| ext v3.16b,v17.16b,v17.16b,#8 |
| mov x12,#0 |
| eor v21.16b,v21.16b,v20.16b //Karatsuba pre-processing |
| mov x2,x0 |
| b .Lgmult_v8 |
| .size gcm_gmult_v8,.-gcm_gmult_v8 |
| |
| .global gcm_ghash_v8 |
| .type gcm_ghash_v8,%function |
| .align 4 |
| gcm_ghash_v8: |
| ld1 {v0.2d},[x0] //load [rotated] Xi |
| subs x3,x3,#16 |
| movi v19.16b,#0xe1 |
| mov x12,#16 |
| ld1 {v20.2d},[x1] //load twisted H |
| csel x12,xzr,x12,eq |
| ext v0.16b,v0.16b,v0.16b,#8 |
| shl v19.2d,v19.2d,#57 |
| ld1 {v17.2d},[x2],x12 //load [rotated] inp |
| ext v21.16b,v20.16b,v20.16b,#8 |
| #ifndef __ARMEB__ |
| rev64 v0.16b,v0.16b |
| rev64 v17.16b,v17.16b |
| #endif |
| eor v21.16b,v21.16b,v20.16b //Karatsuba pre-processing |
| ext v3.16b,v17.16b,v17.16b,#8 |
| b .Loop_v8 |
| |
| .align 4 |
| .Loop_v8: |
| ext v18.16b,v0.16b,v0.16b,#8 |
| eor v3.16b,v3.16b,v0.16b //inp^=Xi |
| eor v17.16b,v17.16b,v18.16b //v17.16b is rotated inp^Xi |
| |
| .Lgmult_v8: |
| pmull v0.1q,v20.1d,v3.1d //H.lo·Xi.lo |
| eor v17.16b,v17.16b,v3.16b //Karatsuba pre-processing |
| pmull2 v2.1q,v20.2d,v3.2d //H.hi·Xi.hi |
| subs x3,x3,#16 |
| pmull v1.1q,v21.1d,v17.1d //(H.lo+H.hi)·(Xi.lo+Xi.hi) |
| csel x12,xzr,x12,eq |
| |
| ext v17.16b,v0.16b,v2.16b,#8 //Karatsuba post-processing |
| eor v18.16b,v0.16b,v2.16b |
| eor v1.16b,v1.16b,v17.16b |
| ld1 {v17.2d},[x2],x12 //load [rotated] inp |
| eor v1.16b,v1.16b,v18.16b |
| pmull v18.1q,v0.1d,v19.1d //1st phase |
| |
| ins v2.d[0],v1.d[1] |
| ins v1.d[1],v0.d[0] |
| #ifndef __ARMEB__ |
| rev64 v17.16b,v17.16b |
| #endif |
| eor v0.16b,v1.16b,v18.16b |
| ext v3.16b,v17.16b,v17.16b,#8 |
| |
| ext v18.16b,v0.16b,v0.16b,#8 //2nd phase |
| pmull v0.1q,v0.1d,v19.1d |
| eor v18.16b,v18.16b,v2.16b |
| eor v0.16b,v0.16b,v18.16b |
| b.hs .Loop_v8 |
| |
| #ifndef __ARMEB__ |
| rev64 v0.16b,v0.16b |
| #endif |
| ext v0.16b,v0.16b,v0.16b,#8 |
| st1 {v0.2d},[x0] //write out Xi |
| |
| ret |
| .size gcm_ghash_v8,.-gcm_ghash_v8 |
| .asciz "GHASH for ARMv8, CRYPTOGAMS by <appro@openssl.org>" |
| .align 2 |
