// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Based on CRYPTOGAMS code with the following comment:
// # ====================================================================
// # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
// # project. The module is, however, dual licensed under OpenSSL and
// # CRYPTOGAMS licenses depending on where you obtain it. For further
// # details see http://www.openssl.org/~appro/cryptogams/.
// # ====================================================================
#include "textflag.h"
// SHA256 block routine. See sha256block.go for Go equivalent.
//
// The algorithm is detailed in FIPS 180-4:
//
// https://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
//
// Wt = Mt; for 0 <= t <= 15
// Wt = SIGMA1(Wt-2) + SIGMA0(Wt-15) + Wt-16; for 16 <= t <= 63
//
// a = H0
// b = H1
// c = H2
// d = H3
// e = H4
// f = H5
// g = H6
// h = H7
//
// for t = 0 to 63 {
// T1 = h + BIGSIGMA1(e) + Ch(e,f,g) + Kt + Wt
// T2 = BIGSIGMA0(a) + Maj(a,b,c)
// h = g
// g = f
// f = e
// e = d + T1
// d = c
// c = b
// b = a
// a = T1 + T2
// }
//
// H0 = a + H0
// H1 = b + H1
// H2 = c + H2
// H3 = d + H3
// H4 = e + H4
// H5 = f + H5
// H6 = g + H6
// H7 = h + H7
#define CTX R3
#define INP R4
#define END R5
#define TBL R6
#define IDX R7
#define CNT R8
#define LEN R9
#define OFFLOAD R11
#define TEMP R12
#define HEX00 R0
#define HEX10 R10
#define HEX20 R25
#define HEX30 R26
#define HEX40 R27
#define HEX50 R28
#define HEX60 R29
#define HEX70 R31
// V0-V7 are A-H
// V8-V23 are used for the message schedule
#define KI V24
#define FUNC V25
#define S0 V26
#define S1 V27
#define s0 V28
#define s1 V29
#define LEMASK V31 // Permutation control register for little endian
// 4 copies of each Kt, to fill all 4 words of a vector register
DATA ·kcon+0x000(SB)/8, $0x428a2f98428a2f98
DATA ·kcon+0x008(SB)/8, $0x428a2f98428a2f98
DATA ·kcon+0x010(SB)/8, $0x7137449171374491
DATA ·kcon+0x018(SB)/8, $0x7137449171374491
DATA ·kcon+0x020(SB)/8, $0xb5c0fbcfb5c0fbcf
DATA ·kcon+0x028(SB)/8, $0xb5c0fbcfb5c0fbcf
DATA ·kcon+0x030(SB)/8, $0xe9b5dba5e9b5dba5
DATA ·kcon+0x038(SB)/8, $0xe9b5dba5e9b5dba5
DATA ·kcon+0x040(SB)/8, $0x3956c25b3956c25b
DATA ·kcon+0x048(SB)/8, $0x3956c25b3956c25b
DATA ·kcon+0x050(SB)/8, $0x59f111f159f111f1
DATA ·kcon+0x058(SB)/8, $0x59f111f159f111f1
DATA ·kcon+0x060(SB)/8, $0x923f82a4923f82a4
DATA ·kcon+0x068(SB)/8, $0x923f82a4923f82a4
DATA ·kcon+0x070(SB)/8, $0xab1c5ed5ab1c5ed5
DATA ·kcon+0x078(SB)/8, $0xab1c5ed5ab1c5ed5
DATA ·kcon+0x080(SB)/8, $0xd807aa98d807aa98
DATA ·kcon+0x088(SB)/8, $0xd807aa98d807aa98
DATA ·kcon+0x090(SB)/8, $0x12835b0112835b01
DATA ·kcon+0x098(SB)/8, $0x12835b0112835b01
DATA ·kcon+0x0A0(SB)/8, $0x243185be243185be
DATA ·kcon+0x0A8(SB)/8, $0x243185be243185be
DATA ·kcon+0x0B0(SB)/8, $0x550c7dc3550c7dc3
DATA ·kcon+0x0B8(SB)/8, $0x550c7dc3550c7dc3
DATA ·kcon+0x0C0(SB)/8, $0x72be5d7472be5d74
DATA ·kcon+0x0C8(SB)/8, $0x72be5d7472be5d74
DATA ·kcon+0x0D0(SB)/8, $0x80deb1fe80deb1fe
DATA ·kcon+0x0D8(SB)/8, $0x80deb1fe80deb1fe
DATA ·kcon+0x0E0(SB)/8, $0x9bdc06a79bdc06a7
DATA ·kcon+0x0E8(SB)/8, $0x9bdc06a79bdc06a7
DATA ·kcon+0x0F0(SB)/8, $0xc19bf174c19bf174
DATA ·kcon+0x0F8(SB)/8, $0xc19bf174c19bf174
DATA ·kcon+0x100(SB)/8, $0xe49b69c1e49b69c1
DATA ·kcon+0x108(SB)/8, $0xe49b69c1e49b69c1
DATA ·kcon+0x110(SB)/8, $0xefbe4786efbe4786
DATA ·kcon+0x118(SB)/8, $0xefbe4786efbe4786
DATA ·kcon+0x120(SB)/8, $0x0fc19dc60fc19dc6
DATA ·kcon+0x128(SB)/8, $0x0fc19dc60fc19dc6
DATA ·kcon+0x130(SB)/8, $0x240ca1cc240ca1cc
DATA ·kcon+0x138(SB)/8, $0x240ca1cc240ca1cc
DATA ·kcon+0x140(SB)/8, $0x2de92c6f2de92c6f
DATA ·kcon+0x148(SB)/8, $0x2de92c6f2de92c6f
DATA ·kcon+0x150(SB)/8, $0x4a7484aa4a7484aa
DATA ·kcon+0x158(SB)/8, $0x4a7484aa4a7484aa
DATA ·kcon+0x160(SB)/8, $0x5cb0a9dc5cb0a9dc
DATA ·kcon+0x168(SB)/8, $0x5cb0a9dc5cb0a9dc
DATA ·kcon+0x170(SB)/8, $0x76f988da76f988da
DATA ·kcon+0x178(SB)/8, $0x76f988da76f988da
DATA ·kcon+0x180(SB)/8, $0x983e5152983e5152
DATA ·kcon+0x188(SB)/8, $0x983e5152983e5152
DATA ·kcon+0x190(SB)/8, $0xa831c66da831c66d
DATA ·kcon+0x198(SB)/8, $0xa831c66da831c66d
DATA ·kcon+0x1A0(SB)/8, $0xb00327c8b00327c8
DATA ·kcon+0x1A8(SB)/8, $0xb00327c8b00327c8
DATA ·kcon+0x1B0(SB)/8, $0xbf597fc7bf597fc7
DATA ·kcon+0x1B8(SB)/8, $0xbf597fc7bf597fc7
DATA ·kcon+0x1C0(SB)/8, $0xc6e00bf3c6e00bf3
DATA ·kcon+0x1C8(SB)/8, $0xc6e00bf3c6e00bf3
DATA ·kcon+0x1D0(SB)/8, $0xd5a79147d5a79147
DATA ·kcon+0x1D8(SB)/8, $0xd5a79147d5a79147
DATA ·kcon+0x1E0(SB)/8, $0x06ca635106ca6351
DATA ·kcon+0x1E8(SB)/8, $0x06ca635106ca6351
DATA ·kcon+0x1F0(SB)/8, $0x1429296714292967
DATA ·kcon+0x1F8(SB)/8, $0x1429296714292967
DATA ·kcon+0x200(SB)/8, $0x27b70a8527b70a85
DATA ·kcon+0x208(SB)/8, $0x27b70a8527b70a85
DATA ·kcon+0x210(SB)/8, $0x2e1b21382e1b2138
DATA ·kcon+0x218(SB)/8, $0x2e1b21382e1b2138
DATA ·kcon+0x220(SB)/8, $0x4d2c6dfc4d2c6dfc
DATA ·kcon+0x228(SB)/8, $0x4d2c6dfc4d2c6dfc
DATA ·kcon+0x230(SB)/8, $0x53380d1353380d13
DATA ·kcon+0x238(SB)/8, $0x53380d1353380d13
DATA ·kcon+0x240(SB)/8, $0x650a7354650a7354
DATA ·kcon+0x248(SB)/8, $0x650a7354650a7354
DATA ·kcon+0x250(SB)/8, $0x766a0abb766a0abb
DATA ·kcon+0x258(SB)/8, $0x766a0abb766a0abb
DATA ·kcon+0x260(SB)/8, $0x81c2c92e81c2c92e
DATA ·kcon+0x268(SB)/8, $0x81c2c92e81c2c92e
DATA ·kcon+0x270(SB)/8, $0x92722c8592722c85
DATA ·kcon+0x278(SB)/8, $0x92722c8592722c85
DATA ·kcon+0x280(SB)/8, $0xa2bfe8a1a2bfe8a1
DATA ·kcon+0x288(SB)/8, $0xa2bfe8a1a2bfe8a1
DATA ·kcon+0x290(SB)/8, $0xa81a664ba81a664b
DATA ·kcon+0x298(SB)/8, $0xa81a664ba81a664b
DATA ·kcon+0x2A0(SB)/8, $0xc24b8b70c24b8b70
DATA ·kcon+0x2A8(SB)/8, $0xc24b8b70c24b8b70
DATA ·kcon+0x2B0(SB)/8, $0xc76c51a3c76c51a3
DATA ·kcon+0x2B8(SB)/8, $0xc76c51a3c76c51a3
DATA ·kcon+0x2C0(SB)/8, $0xd192e819d192e819
DATA ·kcon+0x2C8(SB)/8, $0xd192e819d192e819
DATA ·kcon+0x2D0(SB)/8, $0xd6990624d6990624
DATA ·kcon+0x2D8(SB)/8, $0xd6990624d6990624
DATA ·kcon+0x2E0(SB)/8, $0xf40e3585f40e3585
DATA ·kcon+0x2E8(SB)/8, $0xf40e3585f40e3585
DATA ·kcon+0x2F0(SB)/8, $0x106aa070106aa070
DATA ·kcon+0x2F8(SB)/8, $0x106aa070106aa070
DATA ·kcon+0x300(SB)/8, $0x19a4c11619a4c116
DATA ·kcon+0x308(SB)/8, $0x19a4c11619a4c116
DATA ·kcon+0x310(SB)/8, $0x1e376c081e376c08
DATA ·kcon+0x318(SB)/8, $0x1e376c081e376c08
DATA ·kcon+0x320(SB)/8, $0x2748774c2748774c
DATA ·kcon+0x328(SB)/8, $0x2748774c2748774c
DATA ·kcon+0x330(SB)/8, $0x34b0bcb534b0bcb5
DATA ·kcon+0x338(SB)/8, $0x34b0bcb534b0bcb5
DATA ·kcon+0x340(SB)/8, $0x391c0cb3391c0cb3
DATA ·kcon+0x348(SB)/8, $0x391c0cb3391c0cb3
DATA ·kcon+0x350(SB)/8, $0x4ed8aa4a4ed8aa4a
DATA ·kcon+0x358(SB)/8, $0x4ed8aa4a4ed8aa4a
DATA ·kcon+0x360(SB)/8, $0x5b9cca4f5b9cca4f
DATA ·kcon+0x368(SB)/8, $0x5b9cca4f5b9cca4f
DATA ·kcon+0x370(SB)/8, $0x682e6ff3682e6ff3
DATA ·kcon+0x378(SB)/8, $0x682e6ff3682e6ff3
DATA ·kcon+0x380(SB)/8, $0x748f82ee748f82ee
DATA ·kcon+0x388(SB)/8, $0x748f82ee748f82ee
DATA ·kcon+0x390(SB)/8, $0x78a5636f78a5636f
DATA ·kcon+0x398(SB)/8, $0x78a5636f78a5636f
DATA ·kcon+0x3A0(SB)/8, $0x84c8781484c87814
DATA ·kcon+0x3A8(SB)/8, $0x84c8781484c87814
DATA ·kcon+0x3B0(SB)/8, $0x8cc702088cc70208
DATA ·kcon+0x3B8(SB)/8, $0x8cc702088cc70208
DATA ·kcon+0x3C0(SB)/8, $0x90befffa90befffa
DATA ·kcon+0x3C8(SB)/8, $0x90befffa90befffa
DATA ·kcon+0x3D0(SB)/8, $0xa4506ceba4506ceb
DATA ·kcon+0x3D8(SB)/8, $0xa4506ceba4506ceb
DATA ·kcon+0x3E0(SB)/8, $0xbef9a3f7bef9a3f7
DATA ·kcon+0x3E8(SB)/8, $0xbef9a3f7bef9a3f7
DATA ·kcon+0x3F0(SB)/8, $0xc67178f2c67178f2
DATA ·kcon+0x3F8(SB)/8, $0xc67178f2c67178f2
DATA ·kcon+0x400(SB)/8, $0x0000000000000000
DATA ·kcon+0x408(SB)/8, $0x0000000000000000
DATA ·kcon+0x410(SB)/8, $0x1011121310111213 // permutation control vectors
DATA ·kcon+0x418(SB)/8, $0x1011121300010203
DATA ·kcon+0x420(SB)/8, $0x1011121310111213
DATA ·kcon+0x428(SB)/8, $0x0405060700010203
DATA ·kcon+0x430(SB)/8, $0x1011121308090a0b
DATA ·kcon+0x438(SB)/8, $0x0405060700010203
GLOBL ·kcon(SB), RODATA, $1088
#define SHA256ROUND0(a, b, c, d, e, f, g, h, xi) \
VSEL g, f, e, FUNC; \
VSHASIGMAW $15, e, $1, S1; \
VADDUWM xi, h, h; \
VSHASIGMAW $0, a, $1, S0; \
VADDUWM FUNC, h, h; \
VXOR b, a, FUNC; \
VADDUWM S1, h, h; \
VSEL b, c, FUNC, FUNC; \
VADDUWM KI, g, g; \
VADDUWM h, d, d; \
VADDUWM FUNC, S0, S0; \
LVX (TBL)(IDX), KI; \
ADD $16, IDX; \
VADDUWM S0, h, h
#define SHA256ROUND1(a, b, c, d, e, f, g, h, xi, xj, xj_1, xj_9, xj_14) \
VSHASIGMAW $0, xj_1, $0, s0; \
VSEL g, f, e, FUNC; \
VSHASIGMAW $15, e, $1, S1; \
VADDUWM xi, h, h; \
VSHASIGMAW $0, a, $1, S0; \
VSHASIGMAW $15, xj_14, $0, s1; \
VADDUWM FUNC, h, h; \
VXOR b, a, FUNC; \
VADDUWM xj_9, xj, xj; \
VADDUWM S1, h, h; \
VSEL b, c, FUNC, FUNC; \
VADDUWM KI, g, g; \
VADDUWM h, d, d; \
VADDUWM FUNC, S0, S0; \
VADDUWM s0, xj, xj; \
LVX (TBL)(IDX), KI; \
ADD $16, IDX; \
VADDUWM S0, h, h; \
VADDUWM s1, xj, xj
// func block(dig *digest, p []byte)
TEXT ·block(SB),0,$128-32
MOVD dig+0(FP), CTX
MOVD p_base+8(FP), INP
MOVD p_len+16(FP), LEN
SRD $6, LEN
SLD $6, LEN
ADD INP, LEN, END
CMP INP, END
BEQ end
MOVD $·kcon(SB), TBL
MOVD R1, OFFLOAD
MOVD R0, CNT
MOVWZ $0x10, HEX10
MOVWZ $0x20, HEX20
MOVWZ $0x30, HEX30
MOVWZ $0x40, HEX40
MOVWZ $0x50, HEX50
MOVWZ $0x60, HEX60
MOVWZ $0x70, HEX70
MOVWZ $8, IDX
LVSL (IDX)(R0), LEMASK
VSPLTISB $0x0F, KI
VXOR KI, LEMASK, LEMASK
LXVW4X (CTX)(HEX00), VS32 // v0 = vs32
LXVW4X (CTX)(HEX10), VS36 // v4 = vs36
// unpack the input values into vector registers
VSLDOI $4, V0, V0, V1
VSLDOI $8, V0, V0, V2
VSLDOI $12, V0, V0, V3
VSLDOI $4, V4, V4, V5
VSLDOI $8, V4, V4, V6
VSLDOI $12, V4, V4, V7
loop:
LVX (TBL)(HEX00), KI
MOVWZ $16, IDX
LXVD2X (INP)(R0), VS40 // load v8 (=vs40) in advance
ADD $16, INP
STVX V0, (OFFLOAD+HEX00)
STVX V1, (OFFLOAD+HEX10)
STVX V2, (OFFLOAD+HEX20)
STVX V3, (OFFLOAD+HEX30)
STVX V4, (OFFLOAD+HEX40)
STVX V5, (OFFLOAD+HEX50)
STVX V6, (OFFLOAD+HEX60)
STVX V7, (OFFLOAD+HEX70)
VADDUWM KI, V7, V7 // h+K[i]
LVX (TBL)(IDX), KI
ADD $16, IDX
VPERM V8, V8, LEMASK, V8
SHA256ROUND0(V0, V1, V2, V3, V4, V5, V6, V7, V8)
VSLDOI $4, V8, V8, V9
SHA256ROUND0(V7, V0, V1, V2, V3, V4, V5, V6, V9)
VSLDOI $4, V9, V9, V10
SHA256ROUND0(V6, V7, V0, V1, V2, V3, V4, V5, V10)
LXVD2X (INP)(R0), VS44 // load v12 (=vs44) in advance
ADD $16, INP, INP
VSLDOI $4, V10, V10, V11
SHA256ROUND0(V5, V6, V7, V0, V1, V2, V3, V4, V11)
VPERM V12, V12, LEMASK, V12
SHA256ROUND0(V4, V5, V6, V7, V0, V1, V2, V3, V12)
VSLDOI $4, V12, V12, V13
SHA256ROUND0(V3, V4, V5, V6, V7, V0, V1, V2, V13)
VSLDOI $4, V13, V13, V14
SHA256ROUND0(V2, V3, V4, V5, V6, V7, V0, V1, V14)
LXVD2X (INP)(R0), VS48 // load v16 (=vs48) in advance
ADD $16, INP, INP
VSLDOI $4, V14, V14, V15
SHA256ROUND0(V1, V2, V3, V4, V5, V6, V7, V0, V15)
VPERM V16, V16, LEMASK, V16
SHA256ROUND0(V0, V1, V2, V3, V4, V5, V6, V7, V16)
VSLDOI $4, V16, V16, V17
SHA256ROUND0(V7, V0, V1, V2, V3, V4, V5, V6, V17)
VSLDOI $4, V17, V17, V18
SHA256ROUND0(V6, V7, V0, V1, V2, V3, V4, V5, V18)
VSLDOI $4, V18, V18, V19
LXVD2X (INP)(R0), VS52 // load v20 (=vs52) in advance
ADD $16, INP, INP
SHA256ROUND0(V5, V6, V7, V0, V1, V2, V3, V4, V19)
VPERM V20, V20, LEMASK, V20
SHA256ROUND0(V4, V5, V6, V7, V0, V1, V2, V3, V20)
VSLDOI $4, V20, V20, V21
SHA256ROUND0(V3, V4, V5, V6, V7, V0, V1, V2, V21)
VSLDOI $4, V21, V21, V22
SHA256ROUND0(V2, V3, V4, V5, V6, V7, V0, V1, V22)
VSLDOI $4, V22, V22, V23
SHA256ROUND1(V1, V2, V3, V4, V5, V6, V7, V0, V23, V8, V9, V17, V22)
MOVWZ $3, TEMP
MOVWZ TEMP, CTR
L16_xx:
SHA256ROUND1(V0, V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V18, V23)
SHA256ROUND1(V7, V0, V1, V2, V3, V4, V5, V6, V9, V10, V11, V19, V8)
SHA256ROUND1(V6, V7, V0, V1, V2, V3, V4, V5, V10, V11, V12, V20, V9)
SHA256ROUND1(V5, V6, V7, V0, V1, V2, V3, V4, V11, V12, V13, V21, V10)
SHA256ROUND1(V4, V5, V6, V7, V0, V1, V2, V3, V12, V13, V14, V22, V11)
SHA256ROUND1(V3, V4, V5, V6, V7, V0, V1, V2, V13, V14, V15, V23, V12)
SHA256ROUND1(V2, V3, V4, V5, V6, V7, V0, V1, V14, V15, V16, V8, V13)
SHA256ROUND1(V1, V2, V3, V4, V5, V6, V7, V0, V15, V16, V17, V9, V14)
SHA256ROUND1(V0, V1, V2, V3, V4, V5, V6, V7, V16, V17, V18, V10, V15)
SHA256ROUND1(V7, V0, V1, V2, V3, V4, V5, V6, V17, V18, V19, V11, V16)
SHA256ROUND1(V6, V7, V0, V1, V2, V3, V4, V5, V18, V19, V20, V12, V17)
SHA256ROUND1(V5, V6, V7, V0, V1, V2, V3, V4, V19, V20, V21, V13, V18)
SHA256ROUND1(V4, V5, V6, V7, V0, V1, V2, V3, V20, V21, V22, V14, V19)
SHA256ROUND1(V3, V4, V5, V6, V7, V0, V1, V2, V21, V22, V23, V15, V20)
SHA256ROUND1(V2, V3, V4, V5, V6, V7, V0, V1, V22, V23, V8, V16, V21)
SHA256ROUND1(V1, V2, V3, V4, V5, V6, V7, V0, V23, V8, V9, V17, V22)
BC 0x10, 0, L16_xx // bdnz
LVX (OFFLOAD)(HEX00), V10
LVX (OFFLOAD)(HEX10), V11
VADDUWM V10, V0, V0
LVX (OFFLOAD)(HEX20), V12
VADDUWM V11, V1, V1
LVX (OFFLOAD)(HEX30), V13
VADDUWM V12, V2, V2
LVX (OFFLOAD)(HEX40), V14
VADDUWM V13, V3, V3
LVX (OFFLOAD)(HEX50), V15
VADDUWM V14, V4, V4
LVX (OFFLOAD)(HEX60), V16
VADDUWM V15, V5, V5
LVX (OFFLOAD)(HEX70), V17
VADDUWM V16, V6, V6
VADDUWM V17, V7, V7
CMPU INP, END
BLT loop
LVX (TBL)(IDX), V8
ADD $16, IDX
VPERM V0, V1, KI, V0
LVX (TBL)(IDX), V9
VPERM V4, V5, KI, V4
VPERM V0, V2, V8, V0
VPERM V4, V6, V8, V4
VPERM V0, V3, V9, V0
VPERM V4, V7, V9, V4
STXVD2X VS32, (CTX+HEX00) // v0 = vs32
STXVD2X VS36, (CTX+HEX10) // v4 = vs36
end:
RET
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