1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Accelerated GHASH implementation with Intel PCLMULQDQ-NI 4 * instructions. This file contains accelerated part of ghash 5 * implementation. More information about PCLMULQDQ can be found at: 6 * 7 * http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/ 8 * 9 * Copyright (c) 2009 Intel Corp. 10 * Author: Huang Ying <ying.huang@intel.com> 11 * Vinodh Gopal 12 * Erdinc Ozturk 13 * Deniz Karakoyunlu 14 */ 15 16 #include <linux/linkage.h> 17 #include <asm/frame.h> 18 19 .section .rodata.cst16.bswap_mask, "aM", @progbits, 16 20 .align 16 21 .Lbswap_mask: 22 .octa 0x000102030405060708090a0b0c0d0e0f 23 24 #define DATA %xmm0 25 #define SHASH %xmm1 26 #define T1 %xmm2 27 #define T2 %xmm3 28 #define T3 %xmm4 29 #define BSWAP %xmm5 30 #define IN1 %xmm6 31 32 .text 33 34 /* 35 * __clmul_gf128mul_ble: internal ABI 36 * input: 37 * DATA: operand1 38 * SHASH: operand2, hash_key << 1 mod poly 39 * output: 40 * DATA: operand1 * operand2 mod poly 41 * changed: 42 * T1 43 * T2 44 * T3 45 */ 46 SYM_FUNC_START_LOCAL(__clmul_gf128mul_ble) 47 movaps DATA, T1 48 pshufd $0b01001110, DATA, T2 49 pshufd $0b01001110, SHASH, T3 50 pxor DATA, T2 51 pxor SHASH, T3 52 53 pclmulqdq $0x00, SHASH, DATA # DATA = a0 * b0 54 pclmulqdq $0x11, SHASH, T1 # T1 = a1 * b1 55 pclmulqdq $0x00, T3, T2 # T2 = (a1 + a0) * (b1 + b0) 56 pxor DATA, T2 57 pxor T1, T2 # T2 = a0 * b1 + a1 * b0 58 59 movaps T2, T3 60 pslldq $8, T3 61 psrldq $8, T2 62 pxor T3, DATA 63 pxor T2, T1 # <T1:DATA> is result of 64 # carry-less multiplication 65 66 # first phase of the reduction 67 movaps DATA, T3 68 psllq $1, T3 69 pxor DATA, T3 70 psllq $5, T3 71 pxor DATA, T3 72 psllq $57, T3 73 movaps T3, T2 74 pslldq $8, T2 75 psrldq $8, T3 76 pxor T2, DATA 77 pxor T3, T1 78 79 # second phase of the reduction 80 movaps DATA, T2 81 psrlq $5, T2 82 pxor DATA, T2 83 psrlq $1, T2 84 pxor DATA, T2 85 psrlq $1, T2 86 pxor T2, T1 87 pxor T1, DATA 88 RET 89 SYM_FUNC_END(__clmul_gf128mul_ble) 90 91 /* void clmul_ghash_mul(char *dst, const u128 *shash) */ 92 SYM_FUNC_START(clmul_ghash_mul) 93 FRAME_BEGIN 94 movups (%rdi), DATA 95 movups (%rsi), SHASH 96 movaps .Lbswap_mask, BSWAP 97 pshufb BSWAP, DATA 98 call __clmul_gf128mul_ble 99 pshufb BSWAP, DATA 100 movups DATA, (%rdi) 101 FRAME_END 102 RET 103 SYM_FUNC_END(clmul_ghash_mul) 104 105 /* 106 * void clmul_ghash_update(char *dst, const char *src, unsigned int srclen, 107 * const u128 *shash); 108 */ 109 SYM_FUNC_START(clmul_ghash_update) 110 FRAME_BEGIN 111 cmp $16, %rdx 112 jb .Lupdate_just_ret # check length 113 movaps .Lbswap_mask, BSWAP 114 movups (%rdi), DATA 115 movups (%rcx), SHASH 116 pshufb BSWAP, DATA 117 .align 4 118 .Lupdate_loop: 119 movups (%rsi), IN1 120 pshufb BSWAP, IN1 121 pxor IN1, DATA 122 call __clmul_gf128mul_ble 123 sub $16, %rdx 124 add $16, %rsi 125 cmp $16, %rdx 126 jge .Lupdate_loop 127 pshufb BSWAP, DATA 128 movups DATA, (%rdi) 129 .Lupdate_just_ret: 130 FRAME_END 131 RET 132 SYM_FUNC_END(clmul_ghash_update) 133