--- /dev/null
+// 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.
+
+#include "textflag.h"
+
+// SHA256 block routine. See sha256block.go for Go equivalent.
+//
+// The algorithm is detailed in FIPS 180-4:
+//
+// http://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
+
+// Wt = Mt; for 0 <= t <= 15
+#define MSGSCHEDULE0(index) \
+ MOVWZ (index*4)(R26), R7; \
+ RLWNM $24, R7, $-1, R11; \
+ RLWMI $8, R7, $0x00FF0000, R11; \
+ RLWMI $8, R7, $0x000000FF, R11; \
+ MOVWZ R11, R7; \
+ MOVWZ R7, (index*4)(R27)
+
+// Wt = SIGMA1(Wt-2) + Wt-7 + SIGMA0(Wt-15) + Wt-16; for 16 <= t <= 63
+// SIGMA0(x) = ROTR(7,x) XOR ROTR(18,x) XOR SHR(3,x)
+// SIGMA1(x) = ROTR(17,x) XOR ROTR(19,x) XOR SHR(10,x)
+#define MSGSCHEDULE1(index) \
+ MOVWZ ((index-2)*4)(R27), R7; \
+ MOVWZ R7, R9; \
+ RLWNM $32-17, R7, $-1, R7; \
+ MOVWZ R9, R10; \
+ RLWNM $32-19, R9, $-1, R9; \
+ SRW $10, R10; \
+ MOVWZ ((index-15)*4)(R27), R8; \
+ XOR R9, R7; \
+ MOVWZ R8, R9; \
+ XOR R10, R7; \
+ RLWNM $32-7, R8, $-1, R8; \
+ MOVWZ R9, R10; \
+ SRW $3, R10; \
+ RLWNM $32-18, R9, $-1, R9; \
+ MOVWZ ((index-7)*4)(R27), R11; \
+ ADD R11, R7; \
+ XOR R9, R8; \
+ XOR R10, R8; \
+ MOVWZ ((index-16)*4)(R27), R11; \
+ ADD R11, R8; \
+ ADD R8, R7; \
+ MOVWZ R7, ((index)*4)(R27)
+
+// T1 = h + BIGSIGMA1(e) + Ch(e, f, g) + Kt + Wt
+// BIGSIGMA1(x) = ROTR(6,x) XOR ROTR(11,x) XOR ROTR(25,x)
+// Ch(x, y, z) = (x AND y) XOR (NOT x AND z)
+#define SHA256T1(const, e, f, g, h) \
+ ADD R7, h; \
+ MOVWZ e, R7; \
+ ADD $const, h; \
+ MOVWZ e, R9; \
+ RLWNM $32-6, R7, $-1, R7; \
+ MOVWZ e, R10; \
+ RLWNM $32-11, R9, $-1, R9; \
+ XOR R9, R7; \
+ MOVWZ e, R9; \
+ RLWNM $32-25, R10, $-1, R10; \
+ AND f, R9; \
+ XOR R7, R10; \
+ MOVWZ e, R7; \
+ NOR R7, R7, R7; \
+ ADD R10, h; \
+ AND g, R7; \
+ XOR R9, R7; \
+ ADD h, R7
+
+// T2 = BIGSIGMA0(a) + Maj(a, b, c)
+// BIGSIGMA0(x) = ROTR(2,x) XOR ROTR(13,x) XOR ROTR(22,x)
+// Maj(x, y, z) = (x AND y) XOR (x AND z) XOR (y AND z)
+#define SHA256T2(a, b, c) \
+ MOVWZ a, R28; \
+ MOVWZ c, R8; \
+ RLWNM $32-2, R28, $-1, R28; \
+ MOVWZ a, R10; \
+ AND b, R8; \
+ RLWNM $32-13, R10, $-1, R10; \
+ MOVWZ a, R9; \
+ AND c, R9; \
+ XOR R10, R28; \
+ XOR R9, R8; \
+ MOVWZ a, R10; \
+ MOVWZ b, R9; \
+ RLWNM $32-22, R10, $-1, R10; \
+ AND a, R9; \
+ XOR R9, R8; \
+ XOR R10, R28; \
+ ADD R28, R8
+
+// 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 SHA256ROUND(index, const, a, b, c, d, e, f, g, h) \
+ SHA256T1(const, e, f, g, h); \
+ SHA256T2(a, b, c); \
+ MOVWZ R8, h; \
+ ADD R7, d; \
+ ADD R7, h
+
+#define SHA256ROUND0(index, const, a, b, c, d, e, f, g, h) \
+ MSGSCHEDULE0(index); \
+ SHA256ROUND(index, const, a, b, c, d, e, f, g, h)
+
+#define SHA256ROUND1(index, const, a, b, c, d, e, f, g, h) \
+ MSGSCHEDULE1(index); \
+ SHA256ROUND(index, const, a, b, c, d, e, f, g, h)
+
+// func block(dig *digest, p []byte)
+TEXT ·block(SB),0,$296-32
+ MOVD p_base+8(FP), R26
+ MOVD p_len+16(FP), R29
+ SRD $6, R29
+ SLD $6, R29
+
+ ADD R26, R29, R28
+
+ MOVD R28, 256(R1)
+ CMP R26, R28
+ BEQ end
+
+ MOVD dig+0(FP), R27
+ MOVWZ (0*4)(R27), R14 // a = H0
+ MOVWZ (1*4)(R27), R15 // b = H1
+ MOVWZ (2*4)(R27), R16 // c = H2
+ MOVWZ (3*4)(R27), R17 // d = H3
+ MOVWZ (4*4)(R27), R18 // e = H4
+ MOVWZ (5*4)(R27), R19 // f = H5
+ MOVWZ (6*4)(R27), R20 // g = H6
+ MOVWZ (7*4)(R27), R21 // h = H7
+
+loop:
+ MOVD R1, R27 // R27: message schedule
+
+ SHA256ROUND0(0, 0x428a2f98, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND0(1, 0x71374491, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND0(2, 0xb5c0fbcf, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND0(3, 0xe9b5dba5, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND0(4, 0x3956c25b, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND0(5, 0x59f111f1, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND0(6, 0x923f82a4, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND0(7, 0xab1c5ed5, R15, R16, R17, R18, R19, R20, R21, R14)
+ SHA256ROUND0(8, 0xd807aa98, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND0(9, 0x12835b01, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND0(10, 0x243185be, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND0(11, 0x550c7dc3, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND0(12, 0x72be5d74, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND0(13, 0x80deb1fe, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND0(14, 0x9bdc06a7, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND0(15, 0xc19bf174, R15, R16, R17, R18, R19, R20, R21, R14)
+
+ SHA256ROUND1(16, 0xe49b69c1, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND1(17, 0xefbe4786, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND1(18, 0x0fc19dc6, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND1(19, 0x240ca1cc, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND1(20, 0x2de92c6f, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND1(21, 0x4a7484aa, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND1(22, 0x5cb0a9dc, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND1(23, 0x76f988da, R15, R16, R17, R18, R19, R20, R21, R14)
+ SHA256ROUND1(24, 0x983e5152, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND1(25, 0xa831c66d, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND1(26, 0xb00327c8, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND1(27, 0xbf597fc7, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND1(28, 0xc6e00bf3, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND1(29, 0xd5a79147, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND1(30, 0x06ca6351, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND1(31, 0x14292967, R15, R16, R17, R18, R19, R20, R21, R14)
+ SHA256ROUND1(32, 0x27b70a85, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND1(33, 0x2e1b2138, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND1(34, 0x4d2c6dfc, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND1(35, 0x53380d13, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND1(36, 0x650a7354, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND1(37, 0x766a0abb, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND1(38, 0x81c2c92e, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND1(39, 0x92722c85, R15, R16, R17, R18, R19, R20, R21, R14)
+ SHA256ROUND1(40, 0xa2bfe8a1, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND1(41, 0xa81a664b, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND1(42, 0xc24b8b70, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND1(43, 0xc76c51a3, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND1(44, 0xd192e819, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND1(45, 0xd6990624, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND1(46, 0xf40e3585, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND1(47, 0x106aa070, R15, R16, R17, R18, R19, R20, R21, R14)
+ SHA256ROUND1(48, 0x19a4c116, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND1(49, 0x1e376c08, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND1(50, 0x2748774c, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND1(51, 0x34b0bcb5, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND1(52, 0x391c0cb3, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND1(53, 0x4ed8aa4a, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND1(54, 0x5b9cca4f, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND1(55, 0x682e6ff3, R15, R16, R17, R18, R19, R20, R21, R14)
+ SHA256ROUND1(56, 0x748f82ee, R14, R15, R16, R17, R18, R19, R20, R21)
+ SHA256ROUND1(57, 0x78a5636f, R21, R14, R15, R16, R17, R18, R19, R20)
+ SHA256ROUND1(58, 0x84c87814, R20, R21, R14, R15, R16, R17, R18, R19)
+ SHA256ROUND1(59, 0x8cc70208, R19, R20, R21, R14, R15, R16, R17, R18)
+ SHA256ROUND1(60, 0x90befffa, R18, R19, R20, R21, R14, R15, R16, R17)
+ SHA256ROUND1(61, 0xa4506ceb, R17, R18, R19, R20, R21, R14, R15, R16)
+ SHA256ROUND1(62, 0xbef9a3f7, R16, R17, R18, R19, R20, R21, R14, R15)
+ SHA256ROUND1(63, 0xc67178f2, R15, R16, R17, R18, R19, R20, R21, R14)
+
+ MOVD dig+0(FP), R27
+ MOVWZ (0*4)(R27), R11
+ ADD R11, R14 // H0 = a + H0
+ MOVWZ R14, (0*4)(R27)
+ MOVWZ (1*4)(R27), R11
+ ADD R11, R15 // H1 = b + H1
+ MOVWZ R15, (1*4)(R27)
+ MOVWZ (2*4)(R27), R11
+ ADD R11, R16 // H2 = c + H2
+ MOVWZ R16, (2*4)(R27)
+ MOVWZ (3*4)(R27), R11
+ ADD R11, R17 // H3 = d + H3
+ MOVWZ R17, (3*4)(R27)
+ MOVWZ (4*4)(R27), R11
+ ADD R11, R18 // H4 = e + H4
+ MOVWZ R18, (4*4)(R27)
+ MOVWZ (5*4)(R27), R11
+ ADD R11, R19 // H5 = f + H5
+ MOVWZ R19, (5*4)(R27)
+ MOVWZ (6*4)(R27), R11
+ ADD R11, R20 // H6 = g + H6
+ MOVWZ R20, (6*4)(R27)
+ MOVWZ (7*4)(R27), R11
+ ADD R11, R21 // H7 = h + H7
+ MOVWZ R21, (7*4)(R27)
+
+ ADD $64, R26
+ MOVD 256(R1), R11
+ CMPU R26, R11
+ BLT loop
+
+end:
+ RET