--- /dev/null
+/* Optimized AArch64 implementation of ChaCha20 cipher.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* Copyright (C) 2017-2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
+
+ This file is part of Libgcrypt.
+
+ Libgcrypt is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of
+ the License, or (at your option) any later version.
+
+ Libgcrypt is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* Based on D. J. Bernstein reference implementation at
+ http://cr.yp.to/chacha.html:
+
+ chacha-regs.c version 20080118
+ D. J. Bernstein
+ Public domain. */
+
+#include <sysdep.h>
+
+/* Only LE is supported. */
+#ifdef __AARCH64EL__
+
+#define GET_DATA_POINTER(reg, name) \
+ adrp reg, name ; \
+ add reg, reg, :lo12:name
+
+/* 'ret' instruction replacement for straight-line speculation mitigation */
+#define ret_spec_stop \
+ ret; dsb sy; isb;
+
+.cpu generic+simd
+
+.text
+
+/* register macros */
+#define INPUT x0
+#define DST x1
+#define SRC x2
+#define NBLKS x3
+#define ROUND x4
+#define INPUT_CTR x5
+#define INPUT_POS x6
+#define CTR x7
+
+/* vector registers */
+#define X0 v16
+#define X4 v17
+#define X8 v18
+#define X12 v19
+
+#define X1 v20
+#define X5 v21
+
+#define X9 v22
+#define X13 v23
+#define X2 v24
+#define X6 v25
+
+#define X3 v26
+#define X7 v27
+#define X11 v28
+#define X15 v29
+
+#define X10 v30
+#define X14 v31
+
+#define VCTR v0
+#define VTMP0 v1
+#define VTMP1 v2
+#define VTMP2 v3
+#define VTMP3 v4
+#define X12_TMP v5
+#define X13_TMP v6
+#define ROT8 v7
+
+/**********************************************************************
+ helper macros
+ **********************************************************************/
+
+#define _(...) __VA_ARGS__
+
+#define vpunpckldq(s1, s2, dst) \
+ zip1 dst.4s, s2.4s, s1.4s;
+
+#define vpunpckhdq(s1, s2, dst) \
+ zip2 dst.4s, s2.4s, s1.4s;
+
+#define vpunpcklqdq(s1, s2, dst) \
+ zip1 dst.2d, s2.2d, s1.2d;
+
+#define vpunpckhqdq(s1, s2, dst) \
+ zip2 dst.2d, s2.2d, s1.2d;
+
+/* 4x4 32-bit integer matrix transpose */
+#define transpose_4x4(x0, x1, x2, x3, t1, t2, t3) \
+ vpunpckhdq(x1, x0, t2); \
+ vpunpckldq(x1, x0, x0); \
+ \
+ vpunpckldq(x3, x2, t1); \
+ vpunpckhdq(x3, x2, x2); \
+ \
+ vpunpckhqdq(t1, x0, x1); \
+ vpunpcklqdq(t1, x0, x0); \
+ \
+ vpunpckhqdq(x2, t2, x3); \
+ vpunpcklqdq(x2, t2, x2);
+
+/**********************************************************************
+ 4-way chacha20
+ **********************************************************************/
+
+#define XOR(d,s1,s2) \
+ eor d.16b, s2.16b, s1.16b;
+
+#define PLUS(ds,s) \
+ add ds.4s, ds.4s, s.4s;
+
+#define ROTATE4(dst1,dst2,dst3,dst4,c,src1,src2,src3,src4) \
+ shl dst1.4s, src1.4s, #(c); \
+ shl dst2.4s, src2.4s, #(c); \
+ shl dst3.4s, src3.4s, #(c); \
+ shl dst4.4s, src4.4s, #(c); \
+ sri dst1.4s, src1.4s, #(32 - (c)); \
+ sri dst2.4s, src2.4s, #(32 - (c)); \
+ sri dst3.4s, src3.4s, #(32 - (c)); \
+ sri dst4.4s, src4.4s, #(32 - (c));
+
+#define ROTATE4_8(dst1,dst2,dst3,dst4,src1,src2,src3,src4) \
+ tbl dst1.16b, {src1.16b}, ROT8.16b; \
+ tbl dst2.16b, {src2.16b}, ROT8.16b; \
+ tbl dst3.16b, {src3.16b}, ROT8.16b; \
+ tbl dst4.16b, {src4.16b}, ROT8.16b;
+
+#define ROTATE4_16(dst1,dst2,dst3,dst4,src1,src2,src3,src4) \
+ rev32 dst1.8h, src1.8h; \
+ rev32 dst2.8h, src2.8h; \
+ rev32 dst3.8h, src3.8h; \
+ rev32 dst4.8h, src4.8h;
+
+#define QUARTERROUND4(a1,b1,c1,d1,a2,b2,c2,d2,a3,b3,c3,d3,a4,b4,c4,d4,ign,tmp1,tmp2,tmp3,tmp4) \
+ PLUS(a1,b1); PLUS(a2,b2); \
+ PLUS(a3,b3); PLUS(a4,b4); \
+ XOR(tmp1,d1,a1); XOR(tmp2,d2,a2); \
+ XOR(tmp3,d3,a3); XOR(tmp4,d4,a4); \
+ ROTATE4_16(d1, d2, d3, d4, tmp1, tmp2, tmp3, tmp4); \
+ PLUS(c1,d1); PLUS(c2,d2); \
+ PLUS(c3,d3); PLUS(c4,d4); \
+ XOR(tmp1,b1,c1); XOR(tmp2,b2,c2); \
+ XOR(tmp3,b3,c3); XOR(tmp4,b4,c4); \
+ ROTATE4(b1, b2, b3, b4, 12, tmp1, tmp2, tmp3, tmp4) \
+ PLUS(a1,b1); PLUS(a2,b2); \
+ PLUS(a3,b3); PLUS(a4,b4); \
+ XOR(tmp1,d1,a1); XOR(tmp2,d2,a2); \
+ XOR(tmp3,d3,a3); XOR(tmp4,d4,a4); \
+ ROTATE4_8(d1, d2, d3, d4, tmp1, tmp2, tmp3, tmp4) \
+ PLUS(c1,d1); PLUS(c2,d2); \
+ PLUS(c3,d3); PLUS(c4,d4); \
+ XOR(tmp1,b1,c1); XOR(tmp2,b2,c2); \
+ XOR(tmp3,b3,c3); XOR(tmp4,b4,c4); \
+ ROTATE4(b1, b2, b3, b4, 7, tmp1, tmp2, tmp3, tmp4) \
+
+.align 4
+L(__chacha20_blocks4_data_inc_counter):
+ .long 0,1,2,3
+
+.align 4
+L(__chacha20_blocks4_data_rot8):
+ .byte 3,0,1,2
+ .byte 7,4,5,6
+ .byte 11,8,9,10
+ .byte 15,12,13,14
+
+.hidden __chacha20_neon_blocks4
+ENTRY (__chacha20_neon_blocks4)
+ /* input:
+ * x0: input
+ * x1: dst
+ * x2: src
+ * x3: nblks (multiple of 4)
+ */
+
+ GET_DATA_POINTER(CTR, L(__chacha20_blocks4_data_rot8))
+ add INPUT_CTR, INPUT, #(12*4);
+ ld1 {ROT8.16b}, [CTR];
+ GET_DATA_POINTER(CTR, L(__chacha20_blocks4_data_inc_counter))
+ mov INPUT_POS, INPUT;
+ ld1 {VCTR.16b}, [CTR];
+
+L(loop4):
+ /* Construct counter vectors X12 and X13 */
+
+ ld1 {X15.16b}, [INPUT_CTR];
+ mov ROUND, #20;
+ ld1 {VTMP1.16b-VTMP3.16b}, [INPUT_POS];
+
+ dup X12.4s, X15.s[0];
+ dup X13.4s, X15.s[1];
+ ldr CTR, [INPUT_CTR];
+ add X12.4s, X12.4s, VCTR.4s;
+ dup X0.4s, VTMP1.s[0];
+ dup X1.4s, VTMP1.s[1];
+ dup X2.4s, VTMP1.s[2];
+ dup X3.4s, VTMP1.s[3];
+ dup X14.4s, X15.s[2];
+ cmhi VTMP0.4s, VCTR.4s, X12.4s;
+ dup X15.4s, X15.s[3];
+ add CTR, CTR, #4; /* Update counter */
+ dup X4.4s, VTMP2.s[0];
+ dup X5.4s, VTMP2.s[1];
+ dup X6.4s, VTMP2.s[2];
+ dup X7.4s, VTMP2.s[3];
+ sub X13.4s, X13.4s, VTMP0.4s;
+ dup X8.4s, VTMP3.s[0];
+ dup X9.4s, VTMP3.s[1];
+ dup X10.4s, VTMP3.s[2];
+ dup X11.4s, VTMP3.s[3];
+ mov X12_TMP.16b, X12.16b;
+ mov X13_TMP.16b, X13.16b;
+ str CTR, [INPUT_CTR];
+
+L(round2):
+ subs ROUND, ROUND, #2
+ QUARTERROUND4(X0, X4, X8, X12, X1, X5, X9, X13,
+ X2, X6, X10, X14, X3, X7, X11, X15,
+ tmp:=,VTMP0,VTMP1,VTMP2,VTMP3)
+ QUARTERROUND4(X0, X5, X10, X15, X1, X6, X11, X12,
+ X2, X7, X8, X13, X3, X4, X9, X14,
+ tmp:=,VTMP0,VTMP1,VTMP2,VTMP3)
+ b.ne L(round2);
+
+ ld1 {VTMP0.16b, VTMP1.16b}, [INPUT_POS], #32;
+
+ PLUS(X12, X12_TMP); /* INPUT + 12 * 4 + counter */
+ PLUS(X13, X13_TMP); /* INPUT + 13 * 4 + counter */
+
+ dup VTMP2.4s, VTMP0.s[0]; /* INPUT + 0 * 4 */
+ dup VTMP3.4s, VTMP0.s[1]; /* INPUT + 1 * 4 */
+ dup X12_TMP.4s, VTMP0.s[2]; /* INPUT + 2 * 4 */
+ dup X13_TMP.4s, VTMP0.s[3]; /* INPUT + 3 * 4 */
+ PLUS(X0, VTMP2);
+ PLUS(X1, VTMP3);
+ PLUS(X2, X12_TMP);
+ PLUS(X3, X13_TMP);
+
+ dup VTMP2.4s, VTMP1.s[0]; /* INPUT + 4 * 4 */
+ dup VTMP3.4s, VTMP1.s[1]; /* INPUT + 5 * 4 */
+ dup X12_TMP.4s, VTMP1.s[2]; /* INPUT + 6 * 4 */
+ dup X13_TMP.4s, VTMP1.s[3]; /* INPUT + 7 * 4 */
+ ld1 {VTMP0.16b, VTMP1.16b}, [INPUT_POS];
+ mov INPUT_POS, INPUT;
+ PLUS(X4, VTMP2);
+ PLUS(X5, VTMP3);
+ PLUS(X6, X12_TMP);
+ PLUS(X7, X13_TMP);
+
+ dup VTMP2.4s, VTMP0.s[0]; /* INPUT + 8 * 4 */
+ dup VTMP3.4s, VTMP0.s[1]; /* INPUT + 9 * 4 */
+ dup X12_TMP.4s, VTMP0.s[2]; /* INPUT + 10 * 4 */
+ dup X13_TMP.4s, VTMP0.s[3]; /* INPUT + 11 * 4 */
+ dup VTMP0.4s, VTMP1.s[2]; /* INPUT + 14 * 4 */
+ dup VTMP1.4s, VTMP1.s[3]; /* INPUT + 15 * 4 */
+ PLUS(X8, VTMP2);
+ PLUS(X9, VTMP3);
+ PLUS(X10, X12_TMP);
+ PLUS(X11, X13_TMP);
+ PLUS(X14, VTMP0);
+ PLUS(X15, VTMP1);
+
+ transpose_4x4(X0, X1, X2, X3, VTMP0, VTMP1, VTMP2);
+ transpose_4x4(X4, X5, X6, X7, VTMP0, VTMP1, VTMP2);
+ transpose_4x4(X8, X9, X10, X11, VTMP0, VTMP1, VTMP2);
+ transpose_4x4(X12, X13, X14, X15, VTMP0, VTMP1, VTMP2);
+
+ subs NBLKS, NBLKS, #4;
+
+ st1 {X0.16b,X4.16B,X8.16b, X12.16b}, [DST], #64
+ st1 {X1.16b,X5.16b}, [DST], #32;
+ st1 {X9.16b, X13.16b, X2.16b, X6.16b}, [DST], #64
+ st1 {X10.16b,X14.16b}, [DST], #32;
+ st1 {X3.16b, X7.16b, X11.16b, X15.16b}, [DST], #64;
+
+ b.ne L(loop4);
+
+ ret_spec_stop
+END (__chacha20_neon_blocks4)
+
+#endif
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