mirror of https://git.zx2c4.com/WireGuard
799 lines
29 KiB
C
799 lines
29 KiB
C
/*
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* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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* Copyright 2015 Martin Willi.
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*/
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#include "../wireguard.h"
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#include "chacha20poly1305.h"
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/version.h>
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#include <crypto/algapi.h>
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#include <crypto/scatterwalk.h>
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#ifdef CONFIG_X86_64
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#include <asm/cpufeature.h>
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#include <asm/processor.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
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#include <asm/fpu/api.h>
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#include <asm/simd.h>
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#else
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#include <asm/i387.h>
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#endif
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#ifdef CONFIG_AS_SSSE3
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asmlinkage void chacha20_asm_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src);
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asmlinkage void chacha20_asm_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src);
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#endif
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#ifdef CONFIG_AS_AVX2
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asmlinkage void chacha20_asm_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src);
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#endif
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asmlinkage void poly1305_asm_block_sse2(u32 *h, const u8 *src, const u32 *r, unsigned int blocks);
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asmlinkage void poly1305_asm_2block_sse2(u32 *h, const u8 *src, const u32 *r, unsigned int blocks, const u32 *u);
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#ifdef CONFIG_AS_AVX2
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asmlinkage void poly1305_asm_4block_avx2(u32 *h, const u8 *src, const u32 *r, unsigned int blocks, const u32 *u);
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#endif
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static bool chacha20poly1305_use_avx2 = false;
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static bool chacha20poly1305_use_ssse3 = false;
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static bool chacha20poly1305_use_sse2 = false;
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void chacha20poly1305_init(void)
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{
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chacha20poly1305_use_sse2 = cpu_has_xmm2;
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chacha20poly1305_use_ssse3 = boot_cpu_has(X86_FEATURE_SSSE3);
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chacha20poly1305_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0)
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cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
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#else
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cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL);
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#endif
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}
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#else
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void chacha20poly1305_init(void) { }
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#endif
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#define CHACHA20_IV_SIZE 16
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#define CHACHA20_KEY_SIZE 32
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#define CHACHA20_BLOCK_SIZE 64
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#define POLY1305_BLOCK_SIZE 16
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#define POLY1305_KEY_SIZE 32
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#define POLY1305_MAC_SIZE 16
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static inline u32 le32_to_cpuvp(const void *p)
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{
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return le32_to_cpup(p);
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}
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static inline u32 rotl32(u32 v, u8 n)
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{
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return (v << n) | (v >> (sizeof(v) * 8 - n));
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}
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static inline u64 mlt(u64 a, u64 b)
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{
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return a * b;
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}
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static inline u32 sr(u64 v, u_char n)
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{
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return v >> n;
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}
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static inline u32 and(u32 v, u32 mask)
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{
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return v & mask;
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}
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struct chacha20_ctx {
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u32 state[16];
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} __aligned(32);
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static void chacha20_generic_block(struct chacha20_ctx *ctx, void *stream)
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{
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u32 x[CHACHA20_BLOCK_SIZE / sizeof(u32)];
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__le32 *out = stream;
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int i;
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for (i = 0; i < ARRAY_SIZE(x); i++)
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x[i] = ctx->state[i];
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for (i = 0; i < 20; i += 2) {
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x[0] += x[4]; x[12] = rotl32(x[12] ^ x[0], 16);
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x[1] += x[5]; x[13] = rotl32(x[13] ^ x[1], 16);
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x[2] += x[6]; x[14] = rotl32(x[14] ^ x[2], 16);
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x[3] += x[7]; x[15] = rotl32(x[15] ^ x[3], 16);
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x[8] += x[12]; x[4] = rotl32(x[4] ^ x[8], 12);
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x[9] += x[13]; x[5] = rotl32(x[5] ^ x[9], 12);
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x[10] += x[14]; x[6] = rotl32(x[6] ^ x[10], 12);
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x[11] += x[15]; x[7] = rotl32(x[7] ^ x[11], 12);
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x[0] += x[4]; x[12] = rotl32(x[12] ^ x[0], 8);
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x[1] += x[5]; x[13] = rotl32(x[13] ^ x[1], 8);
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x[2] += x[6]; x[14] = rotl32(x[14] ^ x[2], 8);
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x[3] += x[7]; x[15] = rotl32(x[15] ^ x[3], 8);
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x[8] += x[12]; x[4] = rotl32(x[4] ^ x[8], 7);
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x[9] += x[13]; x[5] = rotl32(x[5] ^ x[9], 7);
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x[10] += x[14]; x[6] = rotl32(x[6] ^ x[10], 7);
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x[11] += x[15]; x[7] = rotl32(x[7] ^ x[11], 7);
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x[0] += x[5]; x[15] = rotl32(x[15] ^ x[0], 16);
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x[1] += x[6]; x[12] = rotl32(x[12] ^ x[1], 16);
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x[2] += x[7]; x[13] = rotl32(x[13] ^ x[2], 16);
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x[3] += x[4]; x[14] = rotl32(x[14] ^ x[3], 16);
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x[10] += x[15]; x[5] = rotl32(x[5] ^ x[10], 12);
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x[11] += x[12]; x[6] = rotl32(x[6] ^ x[11], 12);
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x[8] += x[13]; x[7] = rotl32(x[7] ^ x[8], 12);
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x[9] += x[14]; x[4] = rotl32(x[4] ^ x[9], 12);
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x[0] += x[5]; x[15] = rotl32(x[15] ^ x[0], 8);
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x[1] += x[6]; x[12] = rotl32(x[12] ^ x[1], 8);
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x[2] += x[7]; x[13] = rotl32(x[13] ^ x[2], 8);
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x[3] += x[4]; x[14] = rotl32(x[14] ^ x[3], 8);
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x[10] += x[15]; x[5] = rotl32(x[5] ^ x[10], 7);
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x[11] += x[12]; x[6] = rotl32(x[6] ^ x[11], 7);
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x[8] += x[13]; x[7] = rotl32(x[7] ^ x[8], 7);
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x[9] += x[14]; x[4] = rotl32(x[4] ^ x[9], 7);
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}
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for (i = 0; i < ARRAY_SIZE(x); i++)
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out[i] = cpu_to_le32(x[i] + ctx->state[i]);
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ctx->state[12]++;
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}
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static void chacha20_keysetup(struct chacha20_ctx *ctx, const u8 key[32], const u8 nonce[8])
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{
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static const char constant[16] = "expand 32-byte k";
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ctx->state[0] = le32_to_cpuvp(constant + 0);
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ctx->state[1] = le32_to_cpuvp(constant + 4);
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ctx->state[2] = le32_to_cpuvp(constant + 8);
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ctx->state[3] = le32_to_cpuvp(constant + 12);
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ctx->state[4] = le32_to_cpuvp(key + 0);
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ctx->state[5] = le32_to_cpuvp(key + 4);
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ctx->state[6] = le32_to_cpuvp(key + 8);
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ctx->state[7] = le32_to_cpuvp(key + 12);
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ctx->state[8] = le32_to_cpuvp(key + 16);
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ctx->state[9] = le32_to_cpuvp(key + 20);
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ctx->state[10] = le32_to_cpuvp(key + 24);
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ctx->state[11] = le32_to_cpuvp(key + 28);
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ctx->state[12] = 0;
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ctx->state[13] = 0;
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ctx->state[14] = le32_to_cpuvp(nonce + 0);
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ctx->state[15] = le32_to_cpuvp(nonce + 4);
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}
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static void chacha20_crypt(struct chacha20_ctx *ctx, u8 *dst, const u8 *src, unsigned int bytes, bool have_simd)
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{
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u8 buf[CHACHA20_BLOCK_SIZE];
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if (!have_simd
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#ifdef CONFIG_X86_64
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|| !chacha20poly1305_use_ssse3
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#endif
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)
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goto no_simd;
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#ifdef CONFIG_X86_64
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#ifdef CONFIG_AS_AVX2
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if (chacha20poly1305_use_avx2) {
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while (bytes >= CHACHA20_BLOCK_SIZE * 8) {
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chacha20_asm_8block_xor_avx2(ctx->state, dst, src);
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bytes -= CHACHA20_BLOCK_SIZE * 8;
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src += CHACHA20_BLOCK_SIZE * 8;
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dst += CHACHA20_BLOCK_SIZE * 8;
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ctx->state[12] += 8;
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}
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}
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#endif
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#ifdef CONFIG_AS_SSSE3
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while (bytes >= CHACHA20_BLOCK_SIZE * 4) {
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chacha20_asm_4block_xor_ssse3(ctx->state, dst, src);
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bytes -= CHACHA20_BLOCK_SIZE * 4;
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src += CHACHA20_BLOCK_SIZE * 4;
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dst += CHACHA20_BLOCK_SIZE * 4;
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ctx->state[12] += 4;
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}
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while (bytes >= CHACHA20_BLOCK_SIZE) {
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chacha20_asm_block_xor_ssse3(ctx->state, dst, src);
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bytes -= CHACHA20_BLOCK_SIZE;
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src += CHACHA20_BLOCK_SIZE;
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dst += CHACHA20_BLOCK_SIZE;
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ctx->state[12]++;
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}
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if (bytes) {
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memcpy(buf, src, bytes);
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chacha20_asm_block_xor_ssse3(ctx->state, buf, buf);
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memcpy(dst, buf, bytes);
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}
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return;
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#endif
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#endif
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no_simd:
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if (dst != src)
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memcpy(dst, src, bytes);
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while (bytes >= CHACHA20_BLOCK_SIZE) {
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chacha20_generic_block(ctx, buf);
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crypto_xor(dst, buf, CHACHA20_BLOCK_SIZE);
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bytes -= CHACHA20_BLOCK_SIZE;
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dst += CHACHA20_BLOCK_SIZE;
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}
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if (bytes) {
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chacha20_generic_block(ctx, buf);
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crypto_xor(dst, buf, bytes);
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}
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}
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struct poly1305_ctx {
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/* key */
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u32 r[5];
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/* finalize key */
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u32 s[4];
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/* accumulator */
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u32 h[5];
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/* partial buffer */
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u8 buf[POLY1305_BLOCK_SIZE];
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/* bytes used in partial buffer */
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unsigned int buflen;
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/* derived key u set? */
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bool uset;
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/* derived keys r^3, r^4 set? */
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bool wset;
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/* derived Poly1305 key r^2 */
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u32 u[5];
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/* derived Poly1305 key r^3 */
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u32 r3[5];
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/* derived Poly1305 key r^4 */
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u32 r4[5];
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};
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static void poly1305_init(struct poly1305_ctx *ctx, const u8 key[POLY1305_KEY_SIZE])
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{
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memset(ctx, 0, sizeof(struct poly1305_ctx));
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/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
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ctx->r[0] = (le32_to_cpuvp(key + 0) >> 0) & 0x3ffffff;
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ctx->r[1] = (le32_to_cpuvp(key + 3) >> 2) & 0x3ffff03;
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ctx->r[2] = (le32_to_cpuvp(key + 6) >> 4) & 0x3ffc0ff;
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ctx->r[3] = (le32_to_cpuvp(key + 9) >> 6) & 0x3f03fff;
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ctx->r[4] = (le32_to_cpuvp(key + 12) >> 8) & 0x00fffff;
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ctx->s[0] = le32_to_cpuvp(key + 16);
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ctx->s[1] = le32_to_cpuvp(key + 20);
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ctx->s[2] = le32_to_cpuvp(key + 24);
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ctx->s[3] = le32_to_cpuvp(key + 28);
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}
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static unsigned int poly1305_generic_blocks(struct poly1305_ctx *ctx, const u8 *src, unsigned int srclen, u32 hibit)
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{
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u32 r0, r1, r2, r3, r4;
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u32 s1, s2, s3, s4;
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u32 h0, h1, h2, h3, h4;
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u64 d0, d1, d2, d3, d4;
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r0 = ctx->r[0];
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r1 = ctx->r[1];
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r2 = ctx->r[2];
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r3 = ctx->r[3];
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r4 = ctx->r[4];
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s1 = r1 * 5;
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s2 = r2 * 5;
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s3 = r3 * 5;
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s4 = r4 * 5;
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h0 = ctx->h[0];
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h1 = ctx->h[1];
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h2 = ctx->h[2];
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h3 = ctx->h[3];
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h4 = ctx->h[4];
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while (likely(srclen >= POLY1305_BLOCK_SIZE)) {
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/* h += m[i] */
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h0 += (le32_to_cpuvp(src + 0) >> 0) & 0x3ffffff;
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h1 += (le32_to_cpuvp(src + 3) >> 2) & 0x3ffffff;
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h2 += (le32_to_cpuvp(src + 6) >> 4) & 0x3ffffff;
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h3 += (le32_to_cpuvp(src + 9) >> 6) & 0x3ffffff;
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h4 += (le32_to_cpuvp(src + 12) >> 8) | hibit;
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/* h *= r */
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d0 = mlt(h0, r0) + mlt(h1, s4) + mlt(h2, s3) + mlt(h3, s2) + mlt(h4, s1);
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d1 = mlt(h0, r1) + mlt(h1, r0) + mlt(h2, s4) + mlt(h3, s3) + mlt(h4, s2);
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d2 = mlt(h0, r2) + mlt(h1, r1) + mlt(h2, r0) + mlt(h3, s4) + mlt(h4, s3);
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d3 = mlt(h0, r3) + mlt(h1, r2) + mlt(h2, r1) + mlt(h3, r0) + mlt(h4, s4);
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d4 = mlt(h0, r4) + mlt(h1, r3) + mlt(h2, r2) + mlt(h3, r1) + mlt(h4, r0);
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/* (partial) h %= p */
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d1 += sr(d0, 26); h0 = and(d0, 0x3ffffff);
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d2 += sr(d1, 26); h1 = and(d1, 0x3ffffff);
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d3 += sr(d2, 26); h2 = and(d2, 0x3ffffff);
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d4 += sr(d3, 26); h3 = and(d3, 0x3ffffff);
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h0 += sr(d4, 26) * 5; h4 = and(d4, 0x3ffffff);
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h1 += h0 >> 26; h0 = h0 & 0x3ffffff;
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src += POLY1305_BLOCK_SIZE;
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srclen -= POLY1305_BLOCK_SIZE;
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}
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ctx->h[0] = h0;
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ctx->h[1] = h1;
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ctx->h[2] = h2;
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ctx->h[3] = h3;
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ctx->h[4] = h4;
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return srclen;
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}
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#ifdef CONFIG_X86_64
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static void poly1305_simd_mult(u32 *a, const u32 *b)
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{
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u8 m[POLY1305_BLOCK_SIZE];
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memset(m, 0, sizeof(m));
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/* The poly1305 block function adds a hi-bit to the accumulator which
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* we don't need for key multiplication; compensate for it. */
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a[4] -= 1 << 24;
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poly1305_asm_block_sse2(a, m, b, 1);
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}
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static unsigned int poly1305_simd_blocks(struct poly1305_ctx *ctx, const u8 *src, unsigned int srclen)
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{
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unsigned int blocks;
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#ifdef CONFIG_AS_AVX2
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if (chacha20poly1305_use_avx2 && srclen >= POLY1305_BLOCK_SIZE * 4) {
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if (unlikely(!ctx->wset)) {
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if (!ctx->uset) {
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memcpy(ctx->u, ctx->r, sizeof(ctx->u));
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poly1305_simd_mult(ctx->u, ctx->r);
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ctx->uset = true;
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}
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memcpy(ctx->r3, ctx->u, sizeof(ctx->u));
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poly1305_simd_mult(ctx->r3, ctx->r);
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memcpy(ctx->r4, ctx->r3, sizeof(ctx->u));
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poly1305_simd_mult(ctx->r4, ctx->r);
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ctx->wset = true;
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}
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blocks = srclen / (POLY1305_BLOCK_SIZE * 4);
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poly1305_asm_4block_avx2(ctx->h, src, ctx->r, blocks, ctx->u);
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src += POLY1305_BLOCK_SIZE * 4 * blocks;
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srclen -= POLY1305_BLOCK_SIZE * 4 * blocks;
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}
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#endif
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if (likely(srclen >= POLY1305_BLOCK_SIZE * 2)) {
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if (unlikely(!ctx->uset)) {
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memcpy(ctx->u, ctx->r, sizeof(ctx->u));
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poly1305_simd_mult(ctx->u, ctx->r);
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ctx->uset = true;
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}
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blocks = srclen / (POLY1305_BLOCK_SIZE * 2);
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poly1305_asm_2block_sse2(ctx->h, src, ctx->r, blocks, ctx->u);
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src += POLY1305_BLOCK_SIZE * 2 * blocks;
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srclen -= POLY1305_BLOCK_SIZE * 2 * blocks;
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}
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if (srclen >= POLY1305_BLOCK_SIZE) {
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poly1305_asm_block_sse2(ctx->h, src, ctx->r, 1);
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srclen -= POLY1305_BLOCK_SIZE;
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}
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return srclen;
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}
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#endif
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static void poly1305_update(struct poly1305_ctx *ctx, const u8 *src, unsigned int srclen, bool have_simd)
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{
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unsigned int bytes;
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if (unlikely(ctx->buflen)) {
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bytes = min(srclen, POLY1305_BLOCK_SIZE - ctx->buflen);
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memcpy(ctx->buf + ctx->buflen, src, bytes);
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src += bytes;
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srclen -= bytes;
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ctx->buflen += bytes;
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if (ctx->buflen == POLY1305_BLOCK_SIZE) {
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#ifdef CONFIG_X86_64
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if (have_simd && chacha20poly1305_use_sse2)
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poly1305_simd_blocks(ctx, ctx->buf, POLY1305_BLOCK_SIZE);
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else
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#endif
|
|
poly1305_generic_blocks(ctx, ctx->buf, POLY1305_BLOCK_SIZE, 1 << 24);
|
|
ctx->buflen = 0;
|
|
}
|
|
}
|
|
|
|
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
|
|
#ifdef CONFIG_X86_64
|
|
|
|
if (have_simd && chacha20poly1305_use_sse2)
|
|
bytes = poly1305_simd_blocks(ctx, src, srclen);
|
|
else
|
|
#endif
|
|
bytes = poly1305_generic_blocks(ctx, src, srclen, 1 << 24);
|
|
src += srclen - bytes;
|
|
srclen = bytes;
|
|
}
|
|
|
|
if (unlikely(srclen)) {
|
|
ctx->buflen = srclen;
|
|
memcpy(ctx->buf, src, srclen);
|
|
}
|
|
}
|
|
|
|
static void poly1305_finish(struct poly1305_ctx *ctx, u8 *dst)
|
|
{
|
|
__le32 *mac = (__le32 *)dst;
|
|
u32 h0, h1, h2, h3, h4;
|
|
u32 g0, g1, g2, g3, g4;
|
|
u32 mask;
|
|
u64 f = 0;
|
|
|
|
if (unlikely(ctx->buflen)) {
|
|
ctx->buf[ctx->buflen++] = 1;
|
|
memset(ctx->buf + ctx->buflen, 0, POLY1305_BLOCK_SIZE - ctx->buflen);
|
|
poly1305_generic_blocks(ctx, ctx->buf, POLY1305_BLOCK_SIZE, 0);
|
|
}
|
|
|
|
/* fully carry h */
|
|
h0 = ctx->h[0];
|
|
h1 = ctx->h[1];
|
|
h2 = ctx->h[2];
|
|
h3 = ctx->h[3];
|
|
h4 = ctx->h[4];
|
|
|
|
h2 += (h1 >> 26); h1 = h1 & 0x3ffffff;
|
|
h3 += (h2 >> 26); h2 = h2 & 0x3ffffff;
|
|
h4 += (h3 >> 26); h3 = h3 & 0x3ffffff;
|
|
h0 += (h4 >> 26) * 5; h4 = h4 & 0x3ffffff;
|
|
h1 += (h0 >> 26); h0 = h0 & 0x3ffffff;
|
|
|
|
/* compute h + -p */
|
|
g0 = h0 + 5;
|
|
g1 = h1 + (g0 >> 26); g0 &= 0x3ffffff;
|
|
g2 = h2 + (g1 >> 26); g1 &= 0x3ffffff;
|
|
g3 = h3 + (g2 >> 26); g2 &= 0x3ffffff;
|
|
g4 = h4 + (g3 >> 26) - (1 << 26); g3 &= 0x3ffffff;
|
|
|
|
/* select h if h < p, or h + -p if h >= p */
|
|
mask = (g4 >> ((sizeof(u32) * 8) - 1)) - 1;
|
|
g0 &= mask;
|
|
g1 &= mask;
|
|
g2 &= mask;
|
|
g3 &= mask;
|
|
g4 &= mask;
|
|
mask = ~mask;
|
|
h0 = (h0 & mask) | g0;
|
|
h1 = (h1 & mask) | g1;
|
|
h2 = (h2 & mask) | g2;
|
|
h3 = (h3 & mask) | g3;
|
|
h4 = (h4 & mask) | g4;
|
|
|
|
/* h = h % (2^128) */
|
|
h0 = (h0 >> 0) | (h1 << 26);
|
|
h1 = (h1 >> 6) | (h2 << 20);
|
|
h2 = (h2 >> 12) | (h3 << 14);
|
|
h3 = (h3 >> 18) | (h4 << 8);
|
|
|
|
/* mac = (h + s) % (2^128) */
|
|
f = (f >> 32) + h0 + ctx->s[0]; mac[0] = cpu_to_le32(f);
|
|
f = (f >> 32) + h1 + ctx->s[1]; mac[1] = cpu_to_le32(f);
|
|
f = (f >> 32) + h2 + ctx->s[2]; mac[2] = cpu_to_le32(f);
|
|
f = (f >> 32) + h3 + ctx->s[3]; mac[3] = cpu_to_le32(f);
|
|
}
|
|
|
|
static const uint8_t pad0[16] = { 0 };
|
|
|
|
static struct crypto_alg chacha20_alg = {
|
|
.cra_blocksize = 1,
|
|
.cra_alignmask = sizeof(u32) - 1
|
|
};
|
|
static struct crypto_blkcipher chacha20_cipher = {
|
|
.base = {
|
|
.__crt_alg = &chacha20_alg
|
|
}
|
|
};
|
|
static struct blkcipher_desc chacha20_desc = {
|
|
.tfm = &chacha20_cipher
|
|
};
|
|
|
|
bool chacha20poly1305_encrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
|
|
const uint8_t *ad, const size_t ad_len,
|
|
const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN])
|
|
{
|
|
struct poly1305_ctx poly1305_state;
|
|
struct chacha20_ctx chacha20_state;
|
|
uint8_t block0[CHACHA20_BLOCK_SIZE] = { 0 };
|
|
__le64 len;
|
|
__le64 le_nonce = cpu_to_le64(nonce);
|
|
bool have_simd = false;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
have_simd = irq_fpu_usable();
|
|
if (have_simd)
|
|
kernel_fpu_begin();
|
|
#endif
|
|
|
|
chacha20_keysetup(&chacha20_state, key, (uint8_t *)&le_nonce);
|
|
|
|
chacha20_crypt(&chacha20_state, block0, block0, sizeof(block0), have_simd);
|
|
poly1305_init(&poly1305_state, block0);
|
|
memzero_explicit(block0, sizeof(block0));
|
|
|
|
poly1305_update(&poly1305_state, ad, ad_len, have_simd);
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - ad_len) & 0xf, have_simd);
|
|
|
|
chacha20_crypt(&chacha20_state, dst, src, src_len, have_simd);
|
|
|
|
poly1305_update(&poly1305_state, dst, src_len, have_simd);
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - src_len) & 0xf, have_simd);
|
|
|
|
len = cpu_to_le64(ad_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
len = cpu_to_le64(src_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
poly1305_finish(&poly1305_state, dst + src_len);
|
|
|
|
memzero_explicit(&poly1305_state, sizeof(poly1305_state));
|
|
memzero_explicit(&chacha20_state, sizeof(chacha20_state));
|
|
|
|
#ifdef CONFIG_X86_64
|
|
if (have_simd)
|
|
kernel_fpu_end();
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
bool chacha20poly1305_encrypt_sg(struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
|
|
const uint8_t *ad, const size_t ad_len,
|
|
const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN])
|
|
{
|
|
struct poly1305_ctx poly1305_state;
|
|
struct chacha20_ctx chacha20_state;
|
|
struct blkcipher_walk walk;
|
|
uint8_t block0[CHACHA20_BLOCK_SIZE] = { 0 };
|
|
uint8_t mac[POLY1305_MAC_SIZE];
|
|
__le64 len;
|
|
__le64 le_nonce = cpu_to_le64(nonce);
|
|
bool have_simd = false;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
have_simd = irq_fpu_usable();
|
|
if (have_simd)
|
|
kernel_fpu_begin();
|
|
#endif
|
|
|
|
chacha20_keysetup(&chacha20_state, key, (uint8_t *)&le_nonce);
|
|
|
|
chacha20_crypt(&chacha20_state, block0, block0, sizeof(block0), have_simd);
|
|
poly1305_init(&poly1305_state, block0);
|
|
memzero_explicit(block0, sizeof(block0));
|
|
|
|
poly1305_update(&poly1305_state, ad, ad_len, have_simd);
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - ad_len) & 0xf, have_simd);
|
|
|
|
if (likely(src_len)) {
|
|
blkcipher_walk_init(&walk, dst, src, src_len);
|
|
blkcipher_walk_virt_block(&chacha20_desc, &walk, CHACHA20_BLOCK_SIZE);
|
|
while (walk.nbytes >= CHACHA20_BLOCK_SIZE) {
|
|
size_t chunk_len = rounddown(walk.nbytes, CHACHA20_BLOCK_SIZE);
|
|
chacha20_crypt(&chacha20_state, walk.dst.virt.addr, walk.src.virt.addr, chunk_len, have_simd);
|
|
poly1305_update(&poly1305_state, walk.dst.virt.addr, chunk_len, have_simd);
|
|
blkcipher_walk_done(&chacha20_desc, &walk, walk.nbytes % CHACHA20_BLOCK_SIZE);
|
|
}
|
|
if (walk.nbytes) {
|
|
chacha20_crypt(&chacha20_state, walk.dst.virt.addr, walk.src.virt.addr, walk.nbytes, have_simd);
|
|
poly1305_update(&poly1305_state, walk.dst.virt.addr, walk.nbytes, have_simd);
|
|
blkcipher_walk_done(&chacha20_desc, &walk, 0);
|
|
}
|
|
}
|
|
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - src_len) & 0xf, have_simd);
|
|
|
|
len = cpu_to_le64(ad_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
len = cpu_to_le64(src_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
poly1305_finish(&poly1305_state, mac);
|
|
scatterwalk_map_and_copy(mac, dst, src_len, sizeof(mac), 1);
|
|
memzero_explicit(&poly1305_state, sizeof(poly1305_state));
|
|
memzero_explicit(&chacha20_state, sizeof(chacha20_state));
|
|
memzero_explicit(mac, sizeof(mac));
|
|
|
|
#ifdef CONFIG_X86_64
|
|
if (have_simd)
|
|
kernel_fpu_end();
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
bool chacha20poly1305_decrypt(uint8_t *dst, const uint8_t *src, const size_t src_len,
|
|
const uint8_t *ad, const size_t ad_len,
|
|
const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN])
|
|
{
|
|
struct poly1305_ctx poly1305_state;
|
|
struct chacha20_ctx chacha20_state;
|
|
int ret;
|
|
uint8_t block0[CHACHA20_BLOCK_SIZE] = { 0 };
|
|
uint8_t mac[POLY1305_MAC_SIZE];
|
|
size_t dst_len;
|
|
__le64 len;
|
|
__le64 le_nonce = cpu_to_le64(nonce);
|
|
bool have_simd = false;
|
|
|
|
if (unlikely(src_len < POLY1305_MAC_SIZE))
|
|
return false;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
have_simd = irq_fpu_usable();
|
|
if (have_simd)
|
|
kernel_fpu_begin();
|
|
#endif
|
|
|
|
chacha20_keysetup(&chacha20_state, key, (uint8_t *)&le_nonce);
|
|
|
|
chacha20_crypt(&chacha20_state, block0, block0, sizeof(block0), have_simd);
|
|
poly1305_init(&poly1305_state, block0);
|
|
memzero_explicit(block0, sizeof(block0));
|
|
|
|
poly1305_update(&poly1305_state, ad, ad_len, have_simd);
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - ad_len) & 0xf, have_simd);
|
|
|
|
dst_len = src_len - POLY1305_MAC_SIZE;
|
|
poly1305_update(&poly1305_state, src, dst_len, have_simd);
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - dst_len) & 0xf, have_simd);
|
|
|
|
len = cpu_to_le64(ad_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
len = cpu_to_le64(dst_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
poly1305_finish(&poly1305_state, mac);
|
|
memzero_explicit(&poly1305_state, sizeof(poly1305_state));
|
|
|
|
ret = crypto_memneq(mac, src + dst_len, POLY1305_MAC_SIZE);
|
|
memzero_explicit(mac, POLY1305_MAC_SIZE);
|
|
if (likely(!ret))
|
|
chacha20_crypt(&chacha20_state, dst, src, dst_len, have_simd);
|
|
|
|
memzero_explicit(&chacha20_state, sizeof(chacha20_state));
|
|
#ifdef CONFIG_X86_64
|
|
if (have_simd)
|
|
kernel_fpu_end();
|
|
#endif
|
|
return !ret;
|
|
}
|
|
|
|
bool chacha20poly1305_decrypt_sg(struct scatterlist *dst, struct scatterlist *src, const size_t src_len,
|
|
const uint8_t *ad, const size_t ad_len,
|
|
const uint64_t nonce, const uint8_t key[CHACHA20POLY1305_KEYLEN])
|
|
{
|
|
struct poly1305_ctx poly1305_state;
|
|
struct chacha20_ctx chacha20_state;
|
|
struct blkcipher_walk walk;
|
|
int ret;
|
|
uint8_t block0[CHACHA20_BLOCK_SIZE] = { 0 };
|
|
uint8_t read_mac[POLY1305_MAC_SIZE], computed_mac[POLY1305_MAC_SIZE];
|
|
size_t dst_len;
|
|
__le64 len;
|
|
__le64 le_nonce = cpu_to_le64(nonce);
|
|
bool have_simd = false;
|
|
|
|
if (unlikely(src_len < POLY1305_MAC_SIZE))
|
|
return false;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
have_simd = irq_fpu_usable();
|
|
if (have_simd)
|
|
kernel_fpu_begin();
|
|
#endif
|
|
|
|
chacha20_keysetup(&chacha20_state, key, (uint8_t *)&le_nonce);
|
|
|
|
chacha20_crypt(&chacha20_state, block0, block0, sizeof(block0), have_simd);
|
|
poly1305_init(&poly1305_state, block0);
|
|
memzero_explicit(block0, sizeof(block0));
|
|
|
|
poly1305_update(&poly1305_state, ad, ad_len, have_simd);
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - ad_len) & 0xf, have_simd);
|
|
|
|
dst_len = src_len - POLY1305_MAC_SIZE;
|
|
if (likely(dst_len)) {
|
|
blkcipher_walk_init(&walk, dst, src, dst_len);
|
|
blkcipher_walk_virt_block(&chacha20_desc, &walk, CHACHA20_BLOCK_SIZE);
|
|
while (walk.nbytes >= CHACHA20_BLOCK_SIZE) {
|
|
size_t chunk_len = rounddown(walk.nbytes, CHACHA20_BLOCK_SIZE);
|
|
poly1305_update(&poly1305_state, walk.src.virt.addr, chunk_len, have_simd);
|
|
chacha20_crypt(&chacha20_state, walk.dst.virt.addr, walk.src.virt.addr, chunk_len, have_simd);
|
|
blkcipher_walk_done(&chacha20_desc, &walk, walk.nbytes % CHACHA20_BLOCK_SIZE);
|
|
}
|
|
if (walk.nbytes) {
|
|
poly1305_update(&poly1305_state, walk.dst.virt.addr, walk.nbytes, have_simd);
|
|
chacha20_crypt(&chacha20_state, walk.dst.virt.addr, walk.src.virt.addr, walk.nbytes, have_simd);
|
|
blkcipher_walk_done(&chacha20_desc, &walk, 0);
|
|
}
|
|
}
|
|
|
|
poly1305_update(&poly1305_state, pad0, (0x10 - dst_len) & 0xf, have_simd);
|
|
|
|
len = cpu_to_le64(ad_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
len = cpu_to_le64(dst_len);
|
|
poly1305_update(&poly1305_state, (uint8_t *)&len, sizeof(len), have_simd);
|
|
|
|
poly1305_finish(&poly1305_state, computed_mac);
|
|
memzero_explicit(&poly1305_state, sizeof(poly1305_state));
|
|
|
|
scatterwalk_map_and_copy(read_mac, src, dst_len, POLY1305_MAC_SIZE, 0);
|
|
ret = crypto_memneq(read_mac, computed_mac, POLY1305_MAC_SIZE);
|
|
memzero_explicit(read_mac, POLY1305_MAC_SIZE);
|
|
memzero_explicit(computed_mac, POLY1305_MAC_SIZE);
|
|
memzero_explicit(&chacha20_state, sizeof(chacha20_state));
|
|
#ifdef CONFIG_X86_64
|
|
if (have_simd)
|
|
kernel_fpu_end();
|
|
#endif
|
|
return !ret;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
/* ChaCha20-Poly1305 AEAD test vectors from RFC7539 2.8.2 */
|
|
struct chacha20poly1305_testvec {
|
|
uint8_t *key, *nonce, *assoc, *input, *result;
|
|
size_t alen, ilen;
|
|
};
|
|
static const struct chacha20poly1305_testvec chacha20poly1305_enc_vectors[] = { {
|
|
.key = "\x1c\x92\x40\xa5\xeb\x55\xd3\x8a\xf3\x33\x88\x86\x04\xf6\xb5\xf0\x47\x39\x17\xc1\x40\x2b\x80\x09\x9d\xca\x5c\xbc\x20\x70\x75\xc0",
|
|
.nonce = "\x01\x02\x03\x04\x05\x06\x07\x08",
|
|
.assoc = "\xf3\x33\x88\x86\x00\x00\x00\x00\x00\x00\x4e\x91",
|
|
.alen = 12,
|
|
.input = "\x49\x6e\x74\x65\x72\x6e\x65\x74\x2d\x44\x72\x61\x66\x74\x73\x20\x61\x72\x65\x20\x64\x72\x61\x66\x74\x20\x64\x6f\x63\x75\x6d\x65\x6e\x74\x73\x20\x76\x61\x6c\x69\x64\x20\x66\x6f\x72\x20\x61\x20\x6d\x61\x78\x69\x6d\x75\x6d\x20\x6f\x66\x20\x73\x69\x78\x20\x6d\x6f\x6e\x74\x68\x73\x20\x61\x6e\x64\x20\x6d\x61\x79\x20\x62\x65\x20\x75\x70\x64\x61\x74\x65\x64\x2c\x20\x72\x65\x70\x6c\x61\x63\x65\x64\x2c\x20\x6f\x72\x20\x6f\x62\x73\x6f\x6c\x65\x74\x65\x64\x20\x62\x79\x20\x6f\x74\x68\x65\x72\x20\x64\x6f\x63\x75\x6d\x65\x6e\x74\x73\x20\x61\x74\x20\x61\x6e\x79\x20\x74\x69\x6d\x65\x2e\x20\x49\x74\x20\x69\x73\x20\x69\x6e\x61\x70\x70\x72\x6f\x70\x72\x69\x61\x74\x65\x20\x74\x6f\x20\x75\x73\x65\x20\x49\x6e\x74\x65\x72\x6e\x65\x74\x2d\x44\x72\x61\x66\x74\x73\x20\x61\x73\x20\x72\x65\x66\x65\x72\x65\x6e\x63\x65\x20\x6d\x61\x74\x65\x72\x69\x61\x6c\x20\x6f\x72\x20\x74\x6f\x20\x63\x69\x74\x65\x20\x74\x68\x65\x6d\x20\x6f\x74\x68\x65\x72\x20\x74\x68\x61\x6e\x20\x61\x73\x20\x2f\xe2\x80\x9c\x77\x6f\x72\x6b\x20\x69\x6e\x20\x70\x72\x6f\x67\x72\x65\x73\x73\x2e\x2f\xe2\x80\x9d",
|
|
.ilen = 265,
|
|
.result = "\x64\xa0\x86\x15\x75\x86\x1a\xf4\x60\xf0\x62\xc7\x9b\xe6\x43\xbd\x5e\x80\x5c\xfd\x34\x5c\xf3\x89\xf1\x08\x67\x0a\xc7\x6c\x8c\xb2\x4c\x6c\xfc\x18\x75\x5d\x43\xee\xa0\x9e\xe9\x4e\x38\x2d\x26\xb0\xbd\xb7\xb7\x3c\x32\x1b\x01\x00\xd4\xf0\x3b\x7f\x35\x58\x94\xcf\x33\x2f\x83\x0e\x71\x0b\x97\xce\x98\xc8\xa8\x4a\xbd\x0b\x94\x81\x14\xad\x17\x6e\x00\x8d\x33\xbd\x60\xf9\x82\xb1\xff\x37\xc8\x55\x97\x97\xa0\x6e\xf4\xf0\xef\x61\xc1\x86\x32\x4e\x2b\x35\x06\x38\x36\x06\x90\x7b\x6a\x7c\x02\xb0\xf9\xf6\x15\x7b\x53\xc8\x67\xe4\xb9\x16\x6c\x76\x7b\x80\x4d\x46\xa5\x9b\x52\x16\xcd\xe7\xa4\xe9\x90\x40\xc5\xa4\x04\x33\x22\x5e\xe2\x82\xa1\xb0\xa0\x6c\x52\x3e\xaf\x45\x34\xd7\xf8\x3f\xa1\x15\x5b\x00\x47\x71\x8c\xbc\x54\x6a\x0d\x07\x2b\x04\xb3\x56\x4e\xea\x1b\x42\x22\x73\xf5\x48\x27\x1a\x0b\xb2\x31\x60\x53\xfa\x76\x99\x19\x55\xeb\xd6\x31\x59\x43\x4e\xce\xbb\x4e\x46\x6d\xae\x5a\x10\x73\xa6\x72\x76\x27\x09\x7a\x10\x49\xe6\x17\xd9\x1d\x36\x10\x94\xfa\x68\xf0\xff\x77\x98\x71\x30\x30\x5b\xea\xba\x2e\xda\x04\xdf\x99\x7b\x71\x4d\x6c\x6f\x2c\x29\xa6\xad\x5c\xb4\x02\x2b\x02\x70\x9b\xee\xad\x9d\x67\x89\x0c\xbb\x22\x39\x23\x36\xfe\xa1\x85\x1f\x38"
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|
} };
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|
static const struct chacha20poly1305_testvec chacha20poly1305_dec_vectors[] = { {
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|
.key = "\x1c\x92\x40\xa5\xeb\x55\xd3\x8a\xf3\x33\x88\x86\x04\xf6\xb5\xf0\x47\x39\x17\xc1\x40\x2b\x80\x09\x9d\xca\x5c\xbc\x20\x70\x75\xc0",
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|
.nonce = "\x01\x02\x03\x04\x05\x06\x07\x08",
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|
.assoc = "\xf3\x33\x88\x86\x00\x00\x00\x00\x00\x00\x4e\x91",
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|
.alen = 12,
|
|
.input = "\x64\xa0\x86\x15\x75\x86\x1a\xf4\x60\xf0\x62\xc7\x9b\xe6\x43\xbd\x5e\x80\x5c\xfd\x34\x5c\xf3\x89\xf1\x08\x67\x0a\xc7\x6c\x8c\xb2\x4c\x6c\xfc\x18\x75\x5d\x43\xee\xa0\x9e\xe9\x4e\x38\x2d\x26\xb0\xbd\xb7\xb7\x3c\x32\x1b\x01\x00\xd4\xf0\x3b\x7f\x35\x58\x94\xcf\x33\x2f\x83\x0e\x71\x0b\x97\xce\x98\xc8\xa8\x4a\xbd\x0b\x94\x81\x14\xad\x17\x6e\x00\x8d\x33\xbd\x60\xf9\x82\xb1\xff\x37\xc8\x55\x97\x97\xa0\x6e\xf4\xf0\xef\x61\xc1\x86\x32\x4e\x2b\x35\x06\x38\x36\x06\x90\x7b\x6a\x7c\x02\xb0\xf9\xf6\x15\x7b\x53\xc8\x67\xe4\xb9\x16\x6c\x76\x7b\x80\x4d\x46\xa5\x9b\x52\x16\xcd\xe7\xa4\xe9\x90\x40\xc5\xa4\x04\x33\x22\x5e\xe2\x82\xa1\xb0\xa0\x6c\x52\x3e\xaf\x45\x34\xd7\xf8\x3f\xa1\x15\x5b\x00\x47\x71\x8c\xbc\x54\x6a\x0d\x07\x2b\x04\xb3\x56\x4e\xea\x1b\x42\x22\x73\xf5\x48\x27\x1a\x0b\xb2\x31\x60\x53\xfa\x76\x99\x19\x55\xeb\xd6\x31\x59\x43\x4e\xce\xbb\x4e\x46\x6d\xae\x5a\x10\x73\xa6\x72\x76\x27\x09\x7a\x10\x49\xe6\x17\xd9\x1d\x36\x10\x94\xfa\x68\xf0\xff\x77\x98\x71\x30\x30\x5b\xea\xba\x2e\xda\x04\xdf\x99\x7b\x71\x4d\x6c\x6f\x2c\x29\xa6\xad\x5c\xb4\x02\x2b\x02\x70\x9b\xee\xad\x9d\x67\x89\x0c\xbb\x22\x39\x23\x36\xfe\xa1\x85\x1f\x38",
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|
.ilen = 281,
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|
.result = "\x49\x6e\x74\x65\x72\x6e\x65\x74\x2d\x44\x72\x61\x66\x74\x73\x20\x61\x72\x65\x20\x64\x72\x61\x66\x74\x20\x64\x6f\x63\x75\x6d\x65\x6e\x74\x73\x20\x76\x61\x6c\x69\x64\x20\x66\x6f\x72\x20\x61\x20\x6d\x61\x78\x69\x6d\x75\x6d\x20\x6f\x66\x20\x73\x69\x78\x20\x6d\x6f\x6e\x74\x68\x73\x20\x61\x6e\x64\x20\x6d\x61\x79\x20\x62\x65\x20\x75\x70\x64\x61\x74\x65\x64\x2c\x20\x72\x65\x70\x6c\x61\x63\x65\x64\x2c\x20\x6f\x72\x20\x6f\x62\x73\x6f\x6c\x65\x74\x65\x64\x20\x62\x79\x20\x6f\x74\x68\x65\x72\x20\x64\x6f\x63\x75\x6d\x65\x6e\x74\x73\x20\x61\x74\x20\x61\x6e\x79\x20\x74\x69\x6d\x65\x2e\x20\x49\x74\x20\x69\x73\x20\x69\x6e\x61\x70\x70\x72\x6f\x70\x72\x69\x61\x74\x65\x20\x74\x6f\x20\x75\x73\x65\x20\x49\x6e\x74\x65\x72\x6e\x65\x74\x2d\x44\x72\x61\x66\x74\x73\x20\x61\x73\x20\x72\x65\x66\x65\x72\x65\x6e\x63\x65\x20\x6d\x61\x74\x65\x72\x69\x61\x6c\x20\x6f\x72\x20\x74\x6f\x20\x63\x69\x74\x65\x20\x74\x68\x65\x6d\x20\x6f\x74\x68\x65\x72\x20\x74\x68\x61\x6e\x20\x61\x73\x20\x2f\xe2\x80\x9c\x77\x6f\x72\x6b\x20\x69\x6e\x20\x70\x72\x6f\x67\x72\x65\x73\x73\x2e\x2f\xe2\x80\x9d"
|
|
} };
|
|
|
|
void chacha20poly1305_selftest(void)
|
|
{
|
|
size_t i;
|
|
uint8_t computed_result[512];
|
|
bool success = true;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(chacha20poly1305_enc_vectors); ++i) {
|
|
memset(computed_result, 0, sizeof(computed_result));
|
|
success = chacha20poly1305_encrypt(computed_result, chacha20poly1305_enc_vectors[i].input, chacha20poly1305_enc_vectors[i].ilen, chacha20poly1305_enc_vectors[i].assoc, chacha20poly1305_enc_vectors[i].alen, le64_to_cpu(*(__force __le64 *)chacha20poly1305_enc_vectors[i].nonce), chacha20poly1305_enc_vectors[i].key);
|
|
if (memcmp(computed_result, chacha20poly1305_enc_vectors[i].result, chacha20poly1305_enc_vectors[i].ilen + POLY1305_MAC_SIZE)) {
|
|
pr_info("chacha20poly1305 encryption self-test %zu: FAIL\n", i + 1);
|
|
success = false;
|
|
}
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(chacha20poly1305_dec_vectors); ++i) {
|
|
memset(computed_result, 0, sizeof(computed_result));
|
|
success = chacha20poly1305_decrypt(computed_result, chacha20poly1305_dec_vectors[i].input, chacha20poly1305_dec_vectors[i].ilen, chacha20poly1305_dec_vectors[i].assoc, chacha20poly1305_dec_vectors[i].alen, le64_to_cpu(*(__force __le64 *)chacha20poly1305_dec_vectors[i].nonce), chacha20poly1305_dec_vectors[i].key);
|
|
if (!success || memcmp(computed_result, chacha20poly1305_dec_vectors[i].result, chacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE)) {
|
|
pr_info("chacha20poly1305 decryption self-test %zu: FAIL\n", i + 1);
|
|
success = false;
|
|
}
|
|
}
|
|
if (success)
|
|
pr_info("chacha20poly1305 self-tests: pass\n");
|
|
}
|
|
#endif
|