// Copyright 2024 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.

//go:build !purego

#include "textflag.h"

// SHA512 block routine. See sha512block.go for Go equivalent.

#define REGTMP	R30
#define REGTMP1	R16
#define REGTMP2	R17
#define REGTMP3	R18
#define REGTMP4	R7
#define REGTMP5	R6

// W[i] = M[i]; for 0 <= i <= 15
#define LOAD0(index) \
	MOVV	(index*8)(R5), REGTMP4; \
	WORD	$0x3ce7; \	//REVBV	REGTMP4, REGTMP4
	MOVV	REGTMP4, (index*8)(R3)

// W[i] = SIGMA1(W[i-2]) + W[i-7] + SIGMA0(W[i-15]) + W[i-16]; for 16 <= i <= 79
//   SIGMA0(x) = ROTR(1,x) XOR ROTR(8,x) XOR SHR(7,x)
//   SIGMA1(x) = ROTR(19,x) XOR ROTR(61,x) XOR SHR(6,x)
#define LOAD1(index) \
	MOVV	(((index-2)&0xf)*8)(R3), REGTMP4; \
	MOVV	(((index-15)&0xf)*8)(R3), REGTMP1; \
	MOVV	(((index-7)&0xf)*8)(R3), REGTMP; \
	MOVV	REGTMP4, REGTMP2; \
	MOVV	REGTMP4, REGTMP3; \
	ROTRV	$19, REGTMP4; \
	ROTRV	$61, REGTMP2; \
	SRLV	$6, REGTMP3; \
	XOR	REGTMP2, REGTMP4; \
	XOR	REGTMP3, REGTMP4; \
	ROTRV	$1, REGTMP1, REGTMP5; \
	SRLV	$7, REGTMP1, REGTMP2; \
	ROTRV	$8, REGTMP1; \
	ADDV	REGTMP, REGTMP4; \
	MOVV	(((index-16)&0xf)*8)(R3), REGTMP; \
	XOR	REGTMP1, REGTMP5; \
	XOR	REGTMP2, REGTMP5; \
	ADDV	REGTMP, REGTMP5; \
	ADDV	REGTMP5, REGTMP4; \
	MOVV	REGTMP4, ((index&0xf)*8)(R3)

// h is also used as an accumulator. Wt is passed in REGTMP4.
//   T1 = h + BIGSIGMA1(e) + Ch(e, f, g) + K[i] + W[i]
//     BIGSIGMA1(x) = ROTR(14,x) XOR ROTR(18,x) XOR ROTR(41,x)
//     Ch(x, y, z) = (x AND y) XOR (NOT x AND z)
// Calculate T1 in REGTMP4
#define SHA512T1(const, e, f, g, h) \
	ADDV	$const, h; \
	ADDV	REGTMP4, h; \
	ROTRV	$14, e, REGTMP4; \
	ROTRV	$18, e, REGTMP; \
	ROTRV	$41, e, REGTMP3; \
	AND	f, e, REGTMP2; \
	XOR	REGTMP, REGTMP4; \
	MOVV	$0xffffffffffffffff, REGTMP; \
	XOR	REGTMP4, REGTMP3; \
	XOR	REGTMP, e, REGTMP5; \
	ADDV	REGTMP3, h; \
	AND	g, REGTMP5; \
	XOR	REGTMP2, REGTMP5; \
	ADDV	h, REGTMP5, REGTMP4

// T2 = BIGSIGMA0(a) + Maj(a, b, c)
// BIGSIGMA0(x) = ROTR(28,x) XOR ROTR(34,x) XOR ROTR(39,x)
// Maj(x, y, z) = (x AND y) XOR (x AND z) XOR (y AND z)
// Calculate T2 in REGTMP1
#define SHA512T2(a, b, c) \
	ROTRV	$28, a, REGTMP5; \
	AND	b, c, REGTMP1; \
	ROTRV	$34, a, REGTMP3; \
	AND	c, a, REGTMP; \
	XOR	REGTMP3, REGTMP5; \
	XOR	REGTMP, REGTMP1; \
	ROTRV	$39, a, REGTMP2; \
	AND	a, b, REGTMP3; \
	XOR	REGTMP3, REGTMP1; \
	XOR	REGTMP2, REGTMP5; \
	ADDV	REGTMP5, REGTMP1

// Calculate T1 and T2, then e = d + T1 and a = T1 + T2.
// The values for e and a are stored in d and h, ready for rotation.
#define SHA512ROUND(const, a, b, c, d, e, f, g, h) \
	SHA512T1(const, e, f, g, h); \
	SHA512T2(a, b, c); \
	ADDV	REGTMP4, d; \
	ADDV	REGTMP1, REGTMP4, h

#define SHA512ROUND0(index, const, a, b, c, d, e, f, g, h) \
	LOAD0(index); \
	SHA512ROUND(const, a, b, c, d, e, f, g, h)

#define SHA512ROUND1(index, const, a, b, c, d, e, f, g, h) \
	LOAD1(index); \
	SHA512ROUND(const, a, b, c, d, e, f, g, h)

// A stack frame size of 128 bytes is required here, because
// the frame size used for data expansion is 128 bytes.
// See the definition of the macro LOAD1 above (8 bytes * 16 entries).
//
// func block(dig *Digest, p []byte)
TEXT ·block(SB),NOSPLIT,$128-32
	MOVV	p_len+16(FP), R6
	MOVV	p_base+8(FP), R5
	AND	$~127, R6
	BEQ	R6, end

	// p_len >= 128
	MOVV	dig+0(FP), R4
	ADDV	R5, R6, R25
	MOVV	(0*8)(R4), R8	// a = H0
	MOVV	(1*8)(R4), R9	// b = H1
	MOVV	(2*8)(R4), R10	// c = H2
	MOVV	(3*8)(R4), R11	// d = H3
	MOVV	(4*8)(R4), R12	// e = H4
	MOVV	(5*8)(R4), R13	// f = H5
	MOVV	(6*8)(R4), R14	// g = H6
	MOVV	(7*8)(R4), R15	// h = H7

loop:
	SHA512ROUND0( 0, 0x428a2f98d728ae22, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND0( 1, 0x7137449123ef65cd, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND0( 2, 0xb5c0fbcfec4d3b2f, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND0( 3, 0xe9b5dba58189dbbc, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND0( 4, 0x3956c25bf348b538, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND0( 5, 0x59f111f1b605d019, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND0( 6, 0x923f82a4af194f9b, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND0( 7, 0xab1c5ed5da6d8118, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND0( 8, 0xd807aa98a3030242, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND0( 9, 0x12835b0145706fbe, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND0(10, 0x243185be4ee4b28c, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND0(11, 0x550c7dc3d5ffb4e2, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND0(12, 0x72be5d74f27b896f, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND0(13, 0x80deb1fe3b1696b1, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND0(14, 0x9bdc06a725c71235, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND0(15, 0xc19bf174cf692694, R9,  R10, R11, R12, R13, R14, R15, R8)

	SHA512ROUND1(16, 0xe49b69c19ef14ad2, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(17, 0xefbe4786384f25e3, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(18, 0x0fc19dc68b8cd5b5, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(19, 0x240ca1cc77ac9c65, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(20, 0x2de92c6f592b0275, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(21, 0x4a7484aa6ea6e483, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(22, 0x5cb0a9dcbd41fbd4, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(23, 0x76f988da831153b5, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND1(24, 0x983e5152ee66dfab, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(25, 0xa831c66d2db43210, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(26, 0xb00327c898fb213f, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(27, 0xbf597fc7beef0ee4, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(28, 0xc6e00bf33da88fc2, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(29, 0xd5a79147930aa725, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(30, 0x06ca6351e003826f, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(31, 0x142929670a0e6e70, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND1(32, 0x27b70a8546d22ffc, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(33, 0x2e1b21385c26c926, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(34, 0x4d2c6dfc5ac42aed, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(35, 0x53380d139d95b3df, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(36, 0x650a73548baf63de, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(37, 0x766a0abb3c77b2a8, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(38, 0x81c2c92e47edaee6, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(39, 0x92722c851482353b, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND1(40, 0xa2bfe8a14cf10364, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(41, 0xa81a664bbc423001, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(42, 0xc24b8b70d0f89791, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(43, 0xc76c51a30654be30, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(44, 0xd192e819d6ef5218, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(45, 0xd69906245565a910, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(46, 0xf40e35855771202a, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(47, 0x106aa07032bbd1b8, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND1(48, 0x19a4c116b8d2d0c8, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(49, 0x1e376c085141ab53, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(50, 0x2748774cdf8eeb99, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(51, 0x34b0bcb5e19b48a8, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(52, 0x391c0cb3c5c95a63, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(53, 0x4ed8aa4ae3418acb, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(54, 0x5b9cca4f7763e373, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(55, 0x682e6ff3d6b2b8a3, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND1(56, 0x748f82ee5defb2fc, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(57, 0x78a5636f43172f60, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(58, 0x84c87814a1f0ab72, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(59, 0x8cc702081a6439ec, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(60, 0x90befffa23631e28, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(61, 0xa4506cebde82bde9, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(62, 0xbef9a3f7b2c67915, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(63, 0xc67178f2e372532b, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND1(64, 0xca273eceea26619c, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(65, 0xd186b8c721c0c207, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(66, 0xeada7dd6cde0eb1e, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(67, 0xf57d4f7fee6ed178, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(68, 0x06f067aa72176fba, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(69, 0x0a637dc5a2c898a6, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(70, 0x113f9804bef90dae, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(71, 0x1b710b35131c471b, R9,  R10, R11, R12, R13, R14, R15, R8)
	SHA512ROUND1(72, 0x28db77f523047d84, R8,  R9,  R10, R11, R12, R13, R14, R15)
	SHA512ROUND1(73, 0x32caab7b40c72493, R15, R8,  R9,  R10, R11, R12, R13, R14)
	SHA512ROUND1(74, 0x3c9ebe0a15c9bebc, R14, R15, R8,  R9,  R10, R11, R12, R13)
	SHA512ROUND1(75, 0x431d67c49c100d4c, R13, R14, R15, R8,  R9,  R10, R11, R12)
	SHA512ROUND1(76, 0x4cc5d4becb3e42b6, R12, R13, R14, R15, R8,  R9,  R10, R11)
	SHA512ROUND1(77, 0x597f299cfc657e2a, R11, R12, R13, R14, R15, R8,  R9,  R10)
	SHA512ROUND1(78, 0x5fcb6fab3ad6faec, R10, R11, R12, R13, R14, R15, R8,  R9)
	SHA512ROUND1(79, 0x6c44198c4a475817, R9,  R10, R11, R12, R13, R14, R15, R8)

	MOVV	(0*8)(R4), REGTMP
	MOVV	(1*8)(R4), REGTMP1
	MOVV	(2*8)(R4), REGTMP2
	MOVV	(3*8)(R4), REGTMP3
	ADDV	REGTMP, R8	// H0 = a + H0
	ADDV	REGTMP1, R9	// H1 = b + H1
	ADDV	REGTMP2, R10	// H2 = c + H2
	ADDV	REGTMP3, R11	// H3 = d + H3
	MOVV	R8, (0*8)(R4)
	MOVV	R9, (1*8)(R4)
	MOVV	R10, (2*8)(R4)
	MOVV	R11, (3*8)(R4)
	MOVV	(4*8)(R4), REGTMP
	MOVV	(5*8)(R4), REGTMP1
	MOVV	(6*8)(R4), REGTMP2
	MOVV	(7*8)(R4), REGTMP3
	ADDV	REGTMP, R12	// H4 = e + H4
	ADDV	REGTMP1, R13	// H5 = f + H5
	ADDV	REGTMP2, R14	// H6 = g + H6
	ADDV	REGTMP3, R15	// H7 = h + H7
	MOVV	R12, (4*8)(R4)
	MOVV	R13, (5*8)(R4)
	MOVV	R14, (6*8)(R4)
	MOVV	R15, (7*8)(R4)

	ADDV	$128, R5
	BNE	R5, R25, loop

end:
	RET