/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, x64 AVX2 functions
+ * ChaCha 256-bit cipher algorithm, x64 AVX2 functions
*
* Copyright (C) 2015 Martin Willi
*
.text
-ENTRY(chacha20_2block_xor_avx2)
+ENTRY(chacha_2block_xor_avx2)
# %rdi: Input state matrix, s
# %rsi: up to 2 data blocks output, o
# %rdx: up to 2 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds
- # This function encrypts two ChaCha20 blocks by loading the state
+ # This function encrypts two ChaCha blocks by loading the state
# matrix twice across four AVX registers. It performs matrix operations
# on four words in each matrix in parallel, but requires shuffling to
# rearrange the words after each round.
vmovdqa ROT16(%rip),%ymm5
mov %rcx,%rax
- mov $10,%ecx
.Ldoubleround:
# x3 = shuffle32(x3, MASK(0, 3, 2, 1))
vpshufd $0x39,%ymm3,%ymm3
- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround
# o0 = i0 ^ (x0 + s0)
lea -8(%r10),%rsp
jmp .Ldone2
-ENDPROC(chacha20_2block_xor_avx2)
+ENDPROC(chacha_2block_xor_avx2)
-ENTRY(chacha20_4block_xor_avx2)
+ENTRY(chacha_4block_xor_avx2)
# %rdi: Input state matrix, s
# %rsi: up to 4 data blocks output, o
# %rdx: up to 4 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds
- # This function encrypts four ChaCha20 block by loading the state
+ # This function encrypts four ChaCha blocks by loading the state
# matrix four times across eight AVX registers. It performs matrix
# operations on four words in two matrices in parallel, sequentially
# to the operations on the four words of the other two matrices. The
vmovdqa ROT16(%rip),%ymm9
mov %rcx,%rax
- mov $10,%ecx
.Ldoubleround4:
vpshufd $0x39,%ymm3,%ymm3
vpshufd $0x39,%ymm7,%ymm7
- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround4
# o0 = i0 ^ (x0 + s0), first block
lea -8(%r10),%rsp
jmp .Ldone4
-ENDPROC(chacha20_4block_xor_avx2)
+ENDPROC(chacha_4block_xor_avx2)
-ENTRY(chacha20_8block_xor_avx2)
+ENTRY(chacha_8block_xor_avx2)
# %rdi: Input state matrix, s
# %rsi: up to 8 data blocks output, o
# %rdx: up to 8 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds
- # This function encrypts eight consecutive ChaCha20 blocks by loading
+ # This function encrypts eight consecutive ChaCha blocks by loading
# the state matrix in AVX registers eight times. As we need some
# scratch registers, we save the first four registers on the stack. The
# algorithm performs each operation on the corresponding word of each
# x12 += counter values 0-3
vpaddd %ymm1,%ymm12,%ymm12
- mov $10,%ecx
-
.Ldoubleround8:
# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
vpaddd 0x00(%rsp),%ymm4,%ymm0
vpsrld $25,%ymm4,%ymm4
vpor %ymm0,%ymm4,%ymm4
- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround8
# x0..15[0-3] += s[0..15]
jmp .Ldone8
-ENDPROC(chacha20_8block_xor_avx2)
+ENDPROC(chacha_8block_xor_avx2)
/* SPDX-License-Identifier: GPL-2.0+ */
/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, x64 AVX-512VL functions
+ * ChaCha 256-bit cipher algorithm, x64 AVX-512VL functions
*
* Copyright (C) 2018 Martin Willi
*/
.text
-ENTRY(chacha20_2block_xor_avx512vl)
+ENTRY(chacha_2block_xor_avx512vl)
# %rdi: Input state matrix, s
# %rsi: up to 2 data blocks output, o
# %rdx: up to 2 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds
- # This function encrypts two ChaCha20 blocks by loading the state
+ # This function encrypts two ChaCha blocks by loading the state
# matrix twice across four AVX registers. It performs matrix operations
# on four words in each matrix in parallel, but requires shuffling to
# rearrange the words after each round.
vmovdqa %ymm2,%ymm10
vmovdqa %ymm3,%ymm11
- mov $10,%rax
-
.Ldoubleround:
# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
# x3 = shuffle32(x3, MASK(0, 3, 2, 1))
vpshufd $0x39,%ymm3,%ymm3
- dec %rax
+ sub $2,%r8d
jnz .Ldoubleround
# o0 = i0 ^ (x0 + s0)
jmp .Ldone2
-ENDPROC(chacha20_2block_xor_avx512vl)
+ENDPROC(chacha_2block_xor_avx512vl)
-ENTRY(chacha20_4block_xor_avx512vl)
+ENTRY(chacha_4block_xor_avx512vl)
# %rdi: Input state matrix, s
# %rsi: up to 4 data blocks output, o
# %rdx: up to 4 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds
- # This function encrypts four ChaCha20 block by loading the state
+ # This function encrypts four ChaCha blocks by loading the state
# matrix four times across eight AVX registers. It performs matrix
# operations on four words in two matrices in parallel, sequentially
# to the operations on the four words of the other two matrices. The
vmovdqa %ymm3,%ymm14
vmovdqa %ymm7,%ymm15
- mov $10,%rax
-
.Ldoubleround4:
# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
vpshufd $0x39,%ymm3,%ymm3
vpshufd $0x39,%ymm7,%ymm7
- dec %rax
+ sub $2,%r8d
jnz .Ldoubleround4
# o0 = i0 ^ (x0 + s0), first block
jmp .Ldone4
-ENDPROC(chacha20_4block_xor_avx512vl)
+ENDPROC(chacha_4block_xor_avx512vl)
-ENTRY(chacha20_8block_xor_avx512vl)
+ENTRY(chacha_8block_xor_avx512vl)
# %rdi: Input state matrix, s
# %rsi: up to 8 data blocks output, o
# %rdx: up to 8 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds
- # This function encrypts eight consecutive ChaCha20 blocks by loading
+ # This function encrypts eight consecutive ChaCha blocks by loading
# the state matrix in AVX registers eight times. Compared to AVX2, this
# mostly benefits from the new rotate instructions in VL and the
# additional registers.
vmovdqa64 %ymm14,%ymm30
vmovdqa64 %ymm15,%ymm31
- mov $10,%eax
-
.Ldoubleround8:
# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
vpaddd %ymm0,%ymm4,%ymm0
vpxord %ymm9,%ymm4,%ymm4
vprold $7,%ymm4,%ymm4
- dec %eax
+ sub $2,%r8d
jnz .Ldoubleround8
# x0..15[0-3] += s[0..15]
jmp .Ldone8
-ENDPROC(chacha20_8block_xor_avx512vl)
+ENDPROC(chacha_8block_xor_avx512vl)
/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, SIMD glue code
+ * x64 SIMD accelerated ChaCha and XChaCha stream ciphers,
+ * including ChaCha20 (RFC7539)
*
* Copyright (C) 2015 Martin Willi
*
#include <asm/fpu/api.h>
#include <asm/simd.h>
-#define CHACHA20_STATE_ALIGN 16
+#define CHACHA_STATE_ALIGN 16
-asmlinkage void chacha20_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void hchacha20_block_ssse3(const u32 *state, u32 *out);
+asmlinkage void chacha_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void hchacha_block_ssse3(const u32 *state, u32 *out, int nrounds);
#ifdef CONFIG_AS_AVX2
-asmlinkage void chacha20_2block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_4block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-static bool chacha20_use_avx2;
+asmlinkage void chacha_2block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_4block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+static bool chacha_use_avx2;
#ifdef CONFIG_AS_AVX512
-asmlinkage void chacha20_2block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_4block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_8block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-static bool chacha20_use_avx512vl;
+asmlinkage void chacha_2block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_4block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_8block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+static bool chacha_use_avx512vl;
#endif
#endif
-static unsigned int chacha20_advance(unsigned int len, unsigned int maxblocks)
+static unsigned int chacha_advance(unsigned int len, unsigned int maxblocks)
{
len = min(len, maxblocks * CHACHA_BLOCK_SIZE);
return round_up(len, CHACHA_BLOCK_SIZE) / CHACHA_BLOCK_SIZE;
}
-static void chacha20_dosimd(u32 *state, u8 *dst, const u8 *src,
- unsigned int bytes)
+static void chacha_dosimd(u32 *state, u8 *dst, const u8 *src,
+ unsigned int bytes, int nrounds)
{
#ifdef CONFIG_AS_AVX2
#ifdef CONFIG_AS_AVX512
- if (chacha20_use_avx512vl) {
+ if (chacha_use_avx512vl) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
- chacha20_8block_xor_avx512vl(state, dst, src, bytes);
+ chacha_8block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
- chacha20_8block_xor_avx512vl(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 8);
+ chacha_8block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
+ state[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
- chacha20_4block_xor_avx512vl(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 4);
+ chacha_4block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
+ state[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
- chacha20_2block_xor_avx512vl(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 2);
+ chacha_2block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
+ state[12] += chacha_advance(bytes, 2);
return;
}
}
#endif
- if (chacha20_use_avx2) {
+ if (chacha_use_avx2) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
- chacha20_8block_xor_avx2(state, dst, src, bytes);
+ chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
- chacha20_8block_xor_avx2(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 8);
+ chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
- chacha20_4block_xor_avx2(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 4);
+ chacha_4block_xor_avx2(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 4);
return;
}
if (bytes > CHACHA_BLOCK_SIZE) {
- chacha20_2block_xor_avx2(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 2);
+ chacha_2block_xor_avx2(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 2);
return;
}
}
#endif
while (bytes >= CHACHA_BLOCK_SIZE * 4) {
- chacha20_4block_xor_ssse3(state, dst, src, bytes);
+ chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 4;
src += CHACHA_BLOCK_SIZE * 4;
dst += CHACHA_BLOCK_SIZE * 4;
state[12] += 4;
}
if (bytes > CHACHA_BLOCK_SIZE) {
- chacha20_4block_xor_ssse3(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 4);
+ chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
- chacha20_block_xor_ssse3(state, dst, src, bytes);
+ chacha_block_xor_ssse3(state, dst, src, bytes, nrounds);
state[12]++;
}
}
-static int chacha20_simd_stream_xor(struct skcipher_request *req,
- struct chacha_ctx *ctx, u8 *iv)
+static int chacha_simd_stream_xor(struct skcipher_request *req,
+ struct chacha_ctx *ctx, u8 *iv)
{
u32 *state, state_buf[16 + 2] __aligned(8);
struct skcipher_walk walk;
int err;
- BUILD_BUG_ON(CHACHA20_STATE_ALIGN != 16);
- state = PTR_ALIGN(state_buf + 0, CHACHA20_STATE_ALIGN);
+ BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);
+ state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);
err = skcipher_walk_virt(&walk, req, true);
if (nbytes < walk.total)
nbytes = round_down(nbytes, walk.stride);
- chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes);
+ chacha_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
+ nbytes, ctx->nrounds);
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
return err;
}
-static int chacha20_simd(struct skcipher_request *req)
+static int chacha_simd(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
return crypto_chacha_crypt(req);
kernel_fpu_begin();
- err = chacha20_simd_stream_xor(req, ctx, req->iv);
+ err = chacha_simd_stream_xor(req, ctx, req->iv);
kernel_fpu_end();
return err;
}
-static int xchacha20_simd(struct skcipher_request *req)
+static int xchacha_simd(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
if (req->cryptlen <= CHACHA_BLOCK_SIZE || !irq_fpu_usable())
return crypto_xchacha_crypt(req);
- BUILD_BUG_ON(CHACHA20_STATE_ALIGN != 16);
- state = PTR_ALIGN(state_buf + 0, CHACHA20_STATE_ALIGN);
+ BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);
+ state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);
crypto_chacha_init(state, ctx, req->iv);
kernel_fpu_begin();
- hchacha20_block_ssse3(state, subctx.key);
+ hchacha_block_ssse3(state, subctx.key, ctx->nrounds);
+ subctx.nrounds = ctx->nrounds;
memcpy(&real_iv[0], req->iv + 24, 8);
memcpy(&real_iv[8], req->iv + 16, 8);
- err = chacha20_simd_stream_xor(req, &subctx, real_iv);
+ err = chacha_simd_stream_xor(req, &subctx, real_iv);
kernel_fpu_end();
.ivsize = CHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
- .encrypt = chacha20_simd,
- .decrypt = chacha20_simd,
+ .encrypt = chacha_simd,
+ .decrypt = chacha_simd,
}, {
.base.cra_name = "xchacha20",
.base.cra_driver_name = "xchacha20-simd",
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
- .encrypt = xchacha20_simd,
- .decrypt = xchacha20_simd,
+ .encrypt = xchacha_simd,
+ .decrypt = xchacha_simd,
},
};
-static int __init chacha20_simd_mod_init(void)
+static int __init chacha_simd_mod_init(void)
{
if (!boot_cpu_has(X86_FEATURE_SSSE3))
return -ENODEV;
#ifdef CONFIG_AS_AVX2
- chacha20_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
- boot_cpu_has(X86_FEATURE_AVX2) &&
- cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
+ chacha_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
+ boot_cpu_has(X86_FEATURE_AVX2) &&
+ cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
#ifdef CONFIG_AS_AVX512
- chacha20_use_avx512vl = chacha20_use_avx2 &&
- boot_cpu_has(X86_FEATURE_AVX512VL) &&
- boot_cpu_has(X86_FEATURE_AVX512BW); /* kmovq */
+ chacha_use_avx512vl = chacha_use_avx2 &&
+ boot_cpu_has(X86_FEATURE_AVX512VL) &&
+ boot_cpu_has(X86_FEATURE_AVX512BW); /* kmovq */
#endif
#endif
return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
}
-static void __exit chacha20_simd_mod_fini(void)
+static void __exit chacha_simd_mod_fini(void)
{
crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
}
-module_init(chacha20_simd_mod_init);
-module_exit(chacha20_simd_mod_fini);
+module_init(chacha_simd_mod_init);
+module_exit(chacha_simd_mod_fini);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
-MODULE_DESCRIPTION("chacha20 cipher algorithm, SIMD accelerated");
+MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (x64 SIMD accelerated)");
MODULE_ALIAS_CRYPTO("chacha20");
MODULE_ALIAS_CRYPTO("chacha20-simd");
MODULE_ALIAS_CRYPTO("xchacha20");
OSDN Git Service
