@@ -391,8 +391,9 @@ Copyright 2001 by Stephen L. Moshier <moshier@na-net.ornl.gov>
<https://www.gnu.org/licenses/>. */
sysdeps/aarch64/chacha20.S, sysdeps/x86_64/chacha20-sse2.S,
-sysdeps/x86_64/chacha20-avx2.S, and sysdeps/powerpc/powerpc64/chacha20-ppc.c
-import code from libgcrypt, with the following notices:
+sysdeps/x86_64/chacha20-avx2.S, sysdeps/powerpc/powerpc64/chacha20-ppc.c,
+and sysdeps/s390/s390-64/chacha20-vx.S import code from libgcrypt, with
+the following notices:
Copyright (C) 2017-2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
@@ -67,3 +67,7 @@ tests-container += tst-glibc-hwcaps-cache
endif
endif # $(subdir) == elf
+
+ifeq ($(subdir),stdlib)
+sysdep_routines += chacha20-vx
+endif
new file mode 100644
@@ -0,0 +1,564 @@
+/* Optimized s390x 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/>. */
+
+#include <sysdep.h>
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+
+/* CFA expressions are used for pointing CFA and registers to
+ * SP relative offsets. */
+# define DW_REGNO_SP 15
+
+/* Fixed length encoding used for integers for now. */
+# define DW_SLEB128_7BIT(value) \
+ 0x00|((value) & 0x7f)
+# define DW_SLEB128_28BIT(value) \
+ 0x80|((value)&0x7f), \
+ 0x80|(((value)>>7)&0x7f), \
+ 0x80|(((value)>>14)&0x7f), \
+ 0x00|(((value)>>21)&0x7f)
+
+# define cfi_cfa_on_stack(rsp_offs,cfa_depth) \
+ .cfi_escape \
+ 0x0f, /* DW_CFA_def_cfa_expression */ \
+ DW_SLEB128_7BIT(11), /* length */ \
+ 0x7f, /* DW_OP_breg15, rsp + constant */ \
+ DW_SLEB128_28BIT(rsp_offs), \
+ 0x06, /* DW_OP_deref */ \
+ 0x23, /* DW_OP_plus_constu */ \
+ DW_SLEB128_28BIT((cfa_depth)+160)
+
+.machine "z13+vx"
+.text
+
+.balign 16
+.Lconsts:
+.Lwordswap:
+ .byte 12, 13, 14, 15, 8, 9, 10, 11, 4, 5, 6, 7, 0, 1, 2, 3
+.Lbswap128:
+ .byte 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
+.Lbswap32:
+ .byte 3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12
+.Lone:
+ .long 0, 0, 0, 1
+.Ladd_counter_0123:
+ .long 0, 1, 2, 3
+.Ladd_counter_4567:
+ .long 4, 5, 6, 7
+
+/* register macros */
+#define INPUT %r2
+#define DST %r3
+#define SRC %r4
+#define NBLKS %r0
+#define ROUND %r1
+
+/* stack structure */
+
+#define STACK_FRAME_STD (8 * 16 + 8 * 4)
+#define STACK_FRAME_F8_F15 (8 * 8)
+#define STACK_FRAME_Y0_Y15 (16 * 16)
+#define STACK_FRAME_CTR (4 * 16)
+#define STACK_FRAME_PARAMS (6 * 8)
+
+#define STACK_MAX (STACK_FRAME_STD + STACK_FRAME_F8_F15 + \
+ STACK_FRAME_Y0_Y15 + STACK_FRAME_CTR + \
+ STACK_FRAME_PARAMS)
+
+#define STACK_F8 (STACK_MAX - STACK_FRAME_F8_F15)
+#define STACK_F9 (STACK_F8 + 8)
+#define STACK_F10 (STACK_F9 + 8)
+#define STACK_F11 (STACK_F10 + 8)
+#define STACK_F12 (STACK_F11 + 8)
+#define STACK_F13 (STACK_F12 + 8)
+#define STACK_F14 (STACK_F13 + 8)
+#define STACK_F15 (STACK_F14 + 8)
+#define STACK_Y0_Y15 (STACK_F8 - STACK_FRAME_Y0_Y15)
+#define STACK_CTR (STACK_Y0_Y15 - STACK_FRAME_CTR)
+#define STACK_INPUT (STACK_CTR - STACK_FRAME_PARAMS)
+#define STACK_DST (STACK_INPUT + 8)
+#define STACK_SRC (STACK_DST + 8)
+#define STACK_NBLKS (STACK_SRC + 8)
+#define STACK_POCTX (STACK_NBLKS + 8)
+#define STACK_POSRC (STACK_POCTX + 8)
+
+#define STACK_G0_H3 STACK_Y0_Y15
+
+/* vector registers */
+#define A0 %v0
+#define A1 %v1
+#define A2 %v2
+#define A3 %v3
+
+#define B0 %v4
+#define B1 %v5
+#define B2 %v6
+#define B3 %v7
+
+#define C0 %v8
+#define C1 %v9
+#define C2 %v10
+#define C3 %v11
+
+#define D0 %v12
+#define D1 %v13
+#define D2 %v14
+#define D3 %v15
+
+#define E0 %v16
+#define E1 %v17
+#define E2 %v18
+#define E3 %v19
+
+#define F0 %v20
+#define F1 %v21
+#define F2 %v22
+#define F3 %v23
+
+#define G0 %v24
+#define G1 %v25
+#define G2 %v26
+#define G3 %v27
+
+#define H0 %v28
+#define H1 %v29
+#define H2 %v30
+#define H3 %v31
+
+#define IO0 E0
+#define IO1 E1
+#define IO2 E2
+#define IO3 E3
+#define IO4 F0
+#define IO5 F1
+#define IO6 F2
+#define IO7 F3
+
+#define S0 G0
+#define S1 G1
+#define S2 G2
+#define S3 G3
+
+#define TMP0 H0
+#define TMP1 H1
+#define TMP2 H2
+#define TMP3 H3
+
+#define X0 A0
+#define X1 A1
+#define X2 A2
+#define X3 A3
+#define X4 B0
+#define X5 B1
+#define X6 B2
+#define X7 B3
+#define X8 C0
+#define X9 C1
+#define X10 C2
+#define X11 C3
+#define X12 D0
+#define X13 D1
+#define X14 D2
+#define X15 D3
+
+#define Y0 E0
+#define Y1 E1
+#define Y2 E2
+#define Y3 E3
+#define Y4 F0
+#define Y5 F1
+#define Y6 F2
+#define Y7 F3
+#define Y8 G0
+#define Y9 G1
+#define Y10 G2
+#define Y11 G3
+#define Y12 H0
+#define Y13 H1
+#define Y14 H2
+#define Y15 H3
+
+/**********************************************************************
+ helper macros
+ **********************************************************************/
+
+#define _ /*_*/
+
+#define CLEAR(x,...) vzero x;
+
+#define START_STACK(last_r) \
+ lgr %r0, %r15; \
+ lghi %r1, ~15; \
+ stmg %r6, last_r, 6 * 8(%r15); \
+ aghi %r0, -STACK_MAX; \
+ ngr %r0, %r1; \
+ lgr %r1, %r15; \
+ cfi_def_cfa_register(1); \
+ lgr %r15, %r0; \
+ stg %r1, 0(%r15); \
+ cfi_cfa_on_stack(0, 0); \
+ std %f8, STACK_F8(%r15); \
+ std %f9, STACK_F9(%r15); \
+ std %f10, STACK_F10(%r15); \
+ std %f11, STACK_F11(%r15); \
+ std %f12, STACK_F12(%r15); \
+ std %f13, STACK_F13(%r15); \
+ std %f14, STACK_F14(%r15); \
+ std %f15, STACK_F15(%r15);
+
+#define END_STACK(last_r) \
+ lg %r1, 0(%r15); \
+ ld %f8, STACK_F8(%r15); \
+ ld %f9, STACK_F9(%r15); \
+ ld %f10, STACK_F10(%r15); \
+ ld %f11, STACK_F11(%r15); \
+ ld %f12, STACK_F12(%r15); \
+ ld %f13, STACK_F13(%r15); \
+ ld %f14, STACK_F14(%r15); \
+ ld %f15, STACK_F15(%r15); \
+ lmg %r6, last_r, 6 * 8(%r1); \
+ lgr %r15, %r1; \
+ cfi_def_cfa_register(DW_REGNO_SP);
+
+#define PLUS(dst,src) \
+ vaf dst, dst, src;
+
+#define XOR(dst,src) \
+ vx dst, dst, src;
+
+#define ROTATE(v1,c) \
+ verllf v1, v1, (c)(0);
+
+#define WORD_ROTATE(v1,s) \
+ vsldb v1, v1, v1, ((s) * 4);
+
+#define DST_8(OPER, I, J) \
+ OPER(A##I, J); OPER(B##I, J); OPER(C##I, J); OPER(D##I, J); \
+ OPER(E##I, J); OPER(F##I, J); OPER(G##I, J); OPER(H##I, J);
+
+/**********************************************************************
+ round macros
+ **********************************************************************/
+
+/**********************************************************************
+ 8-way chacha20 ("vertical")
+ **********************************************************************/
+
+#define QUARTERROUND4_V8_POLY(x0,x1,x2,x3,x4,x5,x6,x7,\
+ x8,x9,x10,x11,x12,x13,x14,x15,\
+ y0,y1,y2,y3,y4,y5,y6,y7,\
+ y8,y9,y10,y11,y12,y13,y14,y15,\
+ op1,op2,op3,op4,op5,op6,op7,op8,\
+ op9,op10,op11,op12) \
+ op1; \
+ PLUS(x0, x1); PLUS(x4, x5); \
+ PLUS(x8, x9); PLUS(x12, x13); \
+ PLUS(y0, y1); PLUS(y4, y5); \
+ PLUS(y8, y9); PLUS(y12, y13); \
+ op2; \
+ XOR(x3, x0); XOR(x7, x4); \
+ XOR(x11, x8); XOR(x15, x12); \
+ XOR(y3, y0); XOR(y7, y4); \
+ XOR(y11, y8); XOR(y15, y12); \
+ op3; \
+ ROTATE(x3, 16); ROTATE(x7, 16); \
+ ROTATE(x11, 16); ROTATE(x15, 16); \
+ ROTATE(y3, 16); ROTATE(y7, 16); \
+ ROTATE(y11, 16); ROTATE(y15, 16); \
+ op4; \
+ PLUS(x2, x3); PLUS(x6, x7); \
+ PLUS(x10, x11); PLUS(x14, x15); \
+ PLUS(y2, y3); PLUS(y6, y7); \
+ PLUS(y10, y11); PLUS(y14, y15); \
+ op5; \
+ XOR(x1, x2); XOR(x5, x6); \
+ XOR(x9, x10); XOR(x13, x14); \
+ XOR(y1, y2); XOR(y5, y6); \
+ XOR(y9, y10); XOR(y13, y14); \
+ op6; \
+ ROTATE(x1,12); ROTATE(x5,12); \
+ ROTATE(x9,12); ROTATE(x13,12); \
+ ROTATE(y1,12); ROTATE(y5,12); \
+ ROTATE(y9,12); ROTATE(y13,12); \
+ op7; \
+ PLUS(x0, x1); PLUS(x4, x5); \
+ PLUS(x8, x9); PLUS(x12, x13); \
+ PLUS(y0, y1); PLUS(y4, y5); \
+ PLUS(y8, y9); PLUS(y12, y13); \
+ op8; \
+ XOR(x3, x0); XOR(x7, x4); \
+ XOR(x11, x8); XOR(x15, x12); \
+ XOR(y3, y0); XOR(y7, y4); \
+ XOR(y11, y8); XOR(y15, y12); \
+ op9; \
+ ROTATE(x3,8); ROTATE(x7,8); \
+ ROTATE(x11,8); ROTATE(x15,8); \
+ ROTATE(y3,8); ROTATE(y7,8); \
+ ROTATE(y11,8); ROTATE(y15,8); \
+ op10; \
+ PLUS(x2, x3); PLUS(x6, x7); \
+ PLUS(x10, x11); PLUS(x14, x15); \
+ PLUS(y2, y3); PLUS(y6, y7); \
+ PLUS(y10, y11); PLUS(y14, y15); \
+ op11; \
+ XOR(x1, x2); XOR(x5, x6); \
+ XOR(x9, x10); XOR(x13, x14); \
+ XOR(y1, y2); XOR(y5, y6); \
+ XOR(y9, y10); XOR(y13, y14); \
+ op12; \
+ ROTATE(x1,7); ROTATE(x5,7); \
+ ROTATE(x9,7); ROTATE(x13,7); \
+ ROTATE(y1,7); ROTATE(y5,7); \
+ ROTATE(y9,7); ROTATE(y13,7);
+
+#define QUARTERROUND4_V8(x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15,\
+ y0,y1,y2,y3,y4,y5,y6,y7,y8,y9,y10,y11,y12,y13,y14,y15) \
+ QUARTERROUND4_V8_POLY(x0,x1,x2,x3,x4,x5,x6,x7,\
+ x8,x9,x10,x11,x12,x13,x14,x15,\
+ y0,y1,y2,y3,y4,y5,y6,y7,\
+ y8,y9,y10,y11,y12,y13,y14,y15,\
+ ,,,,,,,,,,,)
+
+#define TRANSPOSE_4X4_2(v0,v1,v2,v3,va,vb,vc,vd,tmp0,tmp1,tmp2,tmpa,tmpb,tmpc) \
+ vmrhf tmp0, v0, v1; \
+ vmrhf tmp1, v2, v3; \
+ vmrlf tmp2, v0, v1; \
+ vmrlf v3, v2, v3; \
+ vmrhf tmpa, va, vb; \
+ vmrhf tmpb, vc, vd; \
+ vmrlf tmpc, va, vb; \
+ vmrlf vd, vc, vd; \
+ vpdi v0, tmp0, tmp1, 0; \
+ vpdi v1, tmp0, tmp1, 5; \
+ vpdi v2, tmp2, v3, 0; \
+ vpdi v3, tmp2, v3, 5; \
+ vpdi va, tmpa, tmpb, 0; \
+ vpdi vb, tmpa, tmpb, 5; \
+ vpdi vc, tmpc, vd, 0; \
+ vpdi vd, tmpc, vd, 5;
+
+.balign 8
+.globl __chacha20_s390x_vx_blocks8
+ENTRY (__chacha20_s390x_vx_blocks8)
+ /* input:
+ * %r2: input
+ * %r3: dst
+ * %r4: src
+ * %r5: nblks (multiple of 8)
+ */
+
+ START_STACK(%r8);
+ lgr NBLKS, %r5;
+
+ larl %r7, .Lconsts;
+
+ /* Load counter. */
+ lg %r8, (12 * 4)(INPUT);
+ rllg %r8, %r8, 32;
+
+.balign 4
+ /* Process eight chacha20 blocks per loop. */
+.Lloop8:
+ vlm Y0, Y3, 0(INPUT);
+
+ slgfi NBLKS, 8;
+ lghi ROUND, (20 / 2);
+
+ /* Construct counter vectors X12/X13 & Y12/Y13. */
+ vl X4, (.Ladd_counter_0123 - .Lconsts)(%r7);
+ vl Y4, (.Ladd_counter_4567 - .Lconsts)(%r7);
+ vrepf Y12, Y3, 0;
+ vrepf Y13, Y3, 1;
+ vaccf X5, Y12, X4;
+ vaccf Y5, Y12, Y4;
+ vaf X12, Y12, X4;
+ vaf Y12, Y12, Y4;
+ vaf X13, Y13, X5;
+ vaf Y13, Y13, Y5;
+
+ vrepf X0, Y0, 0;
+ vrepf X1, Y0, 1;
+ vrepf X2, Y0, 2;
+ vrepf X3, Y0, 3;
+ vrepf X4, Y1, 0;
+ vrepf X5, Y1, 1;
+ vrepf X6, Y1, 2;
+ vrepf X7, Y1, 3;
+ vrepf X8, Y2, 0;
+ vrepf X9, Y2, 1;
+ vrepf X10, Y2, 2;
+ vrepf X11, Y2, 3;
+ vrepf X14, Y3, 2;
+ vrepf X15, Y3, 3;
+
+ /* Store counters for blocks 0-7. */
+ vstm X12, X13, (STACK_CTR + 0 * 16)(%r15);
+ vstm Y12, Y13, (STACK_CTR + 2 * 16)(%r15);
+
+ vlr Y0, X0;
+ vlr Y1, X1;
+ vlr Y2, X2;
+ vlr Y3, X3;
+ vlr Y4, X4;
+ vlr Y5, X5;
+ vlr Y6, X6;
+ vlr Y7, X7;
+ vlr Y8, X8;
+ vlr Y9, X9;
+ vlr Y10, X10;
+ vlr Y11, X11;
+ vlr Y14, X14;
+ vlr Y15, X15;
+
+ /* Update and store counter. */
+ agfi %r8, 8;
+ rllg %r5, %r8, 32;
+ stg %r5, (12 * 4)(INPUT);
+
+.balign 4
+.Lround2_8:
+ QUARTERROUND4_V8(X0, X4, X8, X12, X1, X5, X9, X13,
+ X2, X6, X10, X14, X3, X7, X11, X15,
+ Y0, Y4, Y8, Y12, Y1, Y5, Y9, Y13,
+ Y2, Y6, Y10, Y14, Y3, Y7, Y11, Y15);
+ QUARTERROUND4_V8(X0, X5, X10, X15, X1, X6, X11, X12,
+ X2, X7, X8, X13, X3, X4, X9, X14,
+ Y0, Y5, Y10, Y15, Y1, Y6, Y11, Y12,
+ Y2, Y7, Y8, Y13, Y3, Y4, Y9, Y14);
+ brctg ROUND, .Lround2_8;
+
+ /* Store blocks 4-7. */
+ vstm Y0, Y15, STACK_Y0_Y15(%r15);
+
+ /* Load counters for blocks 0-3. */
+ vlm Y0, Y1, (STACK_CTR + 0 * 16)(%r15);
+
+ lghi ROUND, 1;
+ j .Lfirst_output_4blks_8;
+
+.balign 4
+.Lsecond_output_4blks_8:
+ /* Load blocks 4-7. */
+ vlm X0, X15, STACK_Y0_Y15(%r15);
+
+ /* Load counters for blocks 4-7. */
+ vlm Y0, Y1, (STACK_CTR + 2 * 16)(%r15);
+
+ lghi ROUND, 0;
+
+.balign 4
+ /* Output four chacha20 blocks per loop. */
+.Lfirst_output_4blks_8:
+ vlm Y12, Y15, 0(INPUT);
+ PLUS(X12, Y0);
+ PLUS(X13, Y1);
+ vrepf Y0, Y12, 0;
+ vrepf Y1, Y12, 1;
+ vrepf Y2, Y12, 2;
+ vrepf Y3, Y12, 3;
+ vrepf Y4, Y13, 0;
+ vrepf Y5, Y13, 1;
+ vrepf Y6, Y13, 2;
+ vrepf Y7, Y13, 3;
+ vrepf Y8, Y14, 0;
+ vrepf Y9, Y14, 1;
+ vrepf Y10, Y14, 2;
+ vrepf Y11, Y14, 3;
+ vrepf Y14, Y15, 2;
+ vrepf Y15, Y15, 3;
+ PLUS(X0, Y0);
+ PLUS(X1, Y1);
+ PLUS(X2, Y2);
+ PLUS(X3, Y3);
+ PLUS(X4, Y4);
+ PLUS(X5, Y5);
+ PLUS(X6, Y6);
+ PLUS(X7, Y7);
+ PLUS(X8, Y8);
+ PLUS(X9, Y9);
+ PLUS(X10, Y10);
+ PLUS(X11, Y11);
+ PLUS(X14, Y14);
+ PLUS(X15, Y15);
+
+ vl Y15, (.Lbswap32 - .Lconsts)(%r7);
+ TRANSPOSE_4X4_2(X0, X1, X2, X3, X4, X5, X6, X7,
+ Y9, Y10, Y11, Y12, Y13, Y14);
+ TRANSPOSE_4X4_2(X8, X9, X10, X11, X12, X13, X14, X15,
+ Y9, Y10, Y11, Y12, Y13, Y14);
+
+ vlm Y0, Y14, 0(SRC);
+ vperm X0, X0, X0, Y15;
+ vperm X1, X1, X1, Y15;
+ vperm X2, X2, X2, Y15;
+ vperm X3, X3, X3, Y15;
+ vperm X4, X4, X4, Y15;
+ vperm X5, X5, X5, Y15;
+ vperm X6, X6, X6, Y15;
+ vperm X7, X7, X7, Y15;
+ vperm X8, X8, X8, Y15;
+ vperm X9, X9, X9, Y15;
+ vperm X10, X10, X10, Y15;
+ vperm X11, X11, X11, Y15;
+ vperm X12, X12, X12, Y15;
+ vperm X13, X13, X13, Y15;
+ vperm X14, X14, X14, Y15;
+ vperm X15, X15, X15, Y15;
+ vl Y15, (15 * 16)(SRC);
+
+ XOR(Y0, X0);
+ XOR(Y1, X4);
+ XOR(Y2, X8);
+ XOR(Y3, X12);
+ XOR(Y4, X1);
+ XOR(Y5, X5);
+ XOR(Y6, X9);
+ XOR(Y7, X13);
+ XOR(Y8, X2);
+ XOR(Y9, X6);
+ XOR(Y10, X10);
+ XOR(Y11, X14);
+ XOR(Y12, X3);
+ XOR(Y13, X7);
+ XOR(Y14, X11);
+ XOR(Y15, X15);
+ vstm Y0, Y15, 0(DST);
+
+ aghi SRC, 256;
+ aghi DST, 256;
+
+ clgije ROUND, 1, .Lsecond_output_4blks_8;
+
+ clgijhe NBLKS, 8, .Lloop8;
+
+ /* Clear the used vector registers. */
+ DST_8(CLEAR, 0, _);
+ DST_8(CLEAR, 1, _);
+ DST_8(CLEAR, 2, _);
+ DST_8(CLEAR, 3, _);
+
+ /* Clear sensitive data in stack. */
+ vlm Y0, Y15, STACK_Y0_Y15(%r15);
+ vlm Y0, Y3, STACK_CTR(%r15);
+
+ END_STACK(%r8);
+ xgr %r2, %r2;
+ br %r14;
+END (__chacha20_s390x_vx_blocks8)
+
+#endif /* HAVE_S390_VX_ASM_SUPPORT */
new file mode 100644
@@ -0,0 +1,45 @@
+/* s390x optimization for ChaCha20.VE_S390_VX_ASM_SUPPORT
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdbool.h>
+#include <ldsodefs.h>
+#include <sys/auxv.h>
+
+unsigned int __chacha20_s390x_vx_blocks8 (uint32_t *state, uint8_t *dst,
+ const uint8_t *src, size_t nblks)
+ attribute_hidden;
+
+static inline void
+chacha20_crypt (uint32_t *state, uint8_t *dst, const uint8_t *src,
+ size_t bytes)
+{
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+ _Static_assert (CHACHA20_BUFSIZE % 8 == 0,
+ "CHACHA20_BUFSIZE not multiple of 8");
+ _Static_assert (CHACHA20_BUFSIZE >= CHACHA20_BLOCK_SIZE * 8,
+ "CHACHA20_BUFSIZE < CHACHA20_BLOCK_SIZE * 8");
+
+ if (GLRO(dl_hwcap) & HWCAP_S390_VX)
+ {
+ __chacha20_s390x_vx_blocks8 (state, dst, src,
+ CHACHA20_BUFSIZE / CHACHA20_BLOCK_SIZE);
+ return;
+ }
+#endif
+ chacha20_crypt_generic (state, dst, src, bytes);
+}