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crypto: x86/serpent - drop CTR mode implementation

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Serpent in CTR mode is never used by the kernel directly, and is highly
unlikely to be relied upon by dm-crypt or algif_skcipher. So let's drop
the accelerated CTR mode implementation, and instead, rely on the CTR
template and the bare cipher.

Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2021-01-05 17:47:55 +01:00 committed by Herbert Xu
parent a1f91ecf81
commit 2e9440ae6e
6 changed files with 3 additions and 201 deletions
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20
arch/x86/crypto/serpent-avx-x86_64-asm_64.S
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@ -711,23 +711,3 @@ SYM_FUNC_START(serpent_cbc_dec_8way_avx)
FRAME_END
ret;
SYM_FUNC_END(serpent_cbc_dec_8way_avx)
SYM_FUNC_START(serpent_ctr_8way_avx)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
* %rdx: src
* %rcx: iv (little endian, 128bit)
*/
FRAME_BEGIN
load_ctr_8way(%rcx, .Lbswap128_mask, RA1, RB1, RC1, RD1, RA2, RB2, RC2,
RD2, RK0, RK1, RK2);
call __serpent_enc_blk8_avx;
store_ctr_8way(%rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2);
FRAME_END
ret;
SYM_FUNC_END(serpent_ctr_8way_avx)

25
arch/x86/crypto/serpent-avx2-asm_64.S
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@ -724,28 +724,3 @@ SYM_FUNC_START(serpent_cbc_dec_16way)
FRAME_END
ret;
SYM_FUNC_END(serpent_cbc_dec_16way)
SYM_FUNC_START(serpent_ctr_16way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst (16 blocks)
* %rdx: src (16 blocks)
* %rcx: iv (little endian, 128bit)
*/
FRAME_BEGIN
vzeroupper;
load_ctr_16way(%rcx, .Lbswap128_mask, RA1, RB1, RC1, RD1, RA2, RB2, RC2,
RD2, RK0, RK0x, RK1, RK1x, RK2, RK2x, RK3, RK3x, RNOT,
tp);
call __serpent_enc_blk16;
store_ctr_16way(%rdx, %rsi, RA1, RB1, RC1, RD1, RA2, RB2, RC2, RD2);
vzeroupper;
FRAME_END
ret;
SYM_FUNC_END(serpent_ctr_16way)

38
arch/x86/crypto/serpent_avx2_glue.c
View File

@ -22,8 +22,6 @@ asmlinkage void serpent_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void serpent_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void serpent_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void serpent_ctr_16way(const void *ctx, u8 *dst, const u8 *src,
le128 *iv);
static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
@ -46,22 +44,6 @@ static const struct common_glue_ctx serpent_enc = {
} }
};
static const struct common_glue_ctx serpent_ctr = {
.num_funcs = 3,
.fpu_blocks_limit = 8,
.funcs = { {
.num_blocks = 16,
.fn_u = { .ctr = serpent_ctr_16way }
}, {
.num_blocks = 8,
.fn_u = { .ctr = serpent_ctr_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .ctr = __serpent_crypt_ctr }
} }
};
static const struct common_glue_ctx serpent_dec = {
.num_funcs = 3,
.fpu_blocks_limit = 8,
@ -114,11 +96,6 @@ static int cbc_decrypt(struct skcipher_request *req)
return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
}
static int ctr_crypt(struct skcipher_request *req)
{
return glue_ctr_req_128bit(&serpent_ctr, req);
}
static struct skcipher_alg serpent_algs[] = {
{
.base.cra_name = "__ecb(serpent)",
@ -147,21 +124,6 @@ static struct skcipher_alg serpent_algs[] = {
.setkey = serpent_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "__ctr(serpent)",
.base.cra_driver_name = "__ctr-serpent-avx2",
.base.cra_priority = 600,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct serpent_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.chunksize = SERPENT_BLOCK_SIZE,
.setkey = serpent_setkey_skcipher,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
},
};

51
arch/x86/crypto/serpent_avx_glue.c
View File

@ -31,24 +31,6 @@ asmlinkage void serpent_cbc_dec_8way_avx(const void *ctx, u8 *dst,
const u8 *src);
EXPORT_SYMBOL_GPL(serpent_cbc_dec_8way_avx);
asmlinkage void serpent_ctr_8way_avx(const void *ctx, u8 *dst, const u8 *src,
le128 *iv);
EXPORT_SYMBOL_GPL(serpent_ctr_8way_avx);
void __serpent_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv)
{
be128 ctrblk;
u128 *dst = (u128 *)d;
const u128 *src = (const u128 *)s;
le128_to_be128(&ctrblk, iv);
le128_inc(iv);
__serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
u128_xor(dst, src, (u128 *)&ctrblk);
}
EXPORT_SYMBOL_GPL(__serpent_crypt_ctr);
static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
@ -68,19 +50,6 @@ static const struct common_glue_ctx serpent_enc = {
} }
};
static const struct common_glue_ctx serpent_ctr = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ctr = serpent_ctr_8way_avx }
}, {
.num_blocks = 1,
.fn_u = { .ctr = __serpent_crypt_ctr }
} }
};
static const struct common_glue_ctx serpent_dec = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
@ -127,11 +96,6 @@ static int cbc_decrypt(struct skcipher_request *req)
return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
}
static int ctr_crypt(struct skcipher_request *req)
{
return glue_ctr_req_128bit(&serpent_ctr, req);
}
static struct skcipher_alg serpent_algs[] = {
{
.base.cra_name = "__ecb(serpent)",
@ -160,21 +124,6 @@ static struct skcipher_alg serpent_algs[] = {
.setkey = serpent_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "__ctr(serpent)",
.base.cra_driver_name = "__ctr-serpent-avx",
.base.cra_priority = 500,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct serpent_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.chunksize = SERPENT_BLOCK_SIZE,
.setkey = serpent_setkey_skcipher,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
},
};

67
arch/x86/crypto/serpent_sse2_glue.c
View File

@ -10,8 +10,6 @@
*
* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
* CTR part based on code (crypto/ctr.c) by:
* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
*/
#include <linux/module.h>
@ -47,38 +45,6 @@ static void serpent_decrypt_cbc_xway(const void *ctx, u8 *d, const u8 *s)
u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
}
static void serpent_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv)
{
be128 ctrblk;
u128 *dst = (u128 *)d;
const u128 *src = (const u128 *)s;
le128_to_be128(&ctrblk, iv);
le128_inc(iv);
__serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
u128_xor(dst, src, (u128 *)&ctrblk);
}
static void serpent_crypt_ctr_xway(const void *ctx, u8 *d, const u8 *s,
le128 *iv)
{
be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
u128 *dst = (u128 *)d;
const u128 *src = (const u128 *)s;
unsigned int i;
for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
if (dst != src)
dst[i] = src[i];
le128_to_be128(&ctrblks[i], iv);
le128_inc(iv);
}
serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
}
static const struct common_glue_ctx serpent_enc = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
@ -92,19 +58,6 @@ static const struct common_glue_ctx serpent_enc = {
} }
};
static const struct common_glue_ctx serpent_ctr = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = SERPENT_PARALLEL_BLOCKS,
.fn_u = { .ctr = serpent_crypt_ctr_xway }
}, {
.num_blocks = 1,
.fn_u = { .ctr = serpent_crypt_ctr }
} }
};
static const struct common_glue_ctx serpent_dec = {
.num_funcs = 2,
.fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
@ -152,11 +105,6 @@ static int cbc_decrypt(struct skcipher_request *req)
return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
}
static int ctr_crypt(struct skcipher_request *req)
{
return glue_ctr_req_128bit(&serpent_ctr, req);
}
static struct skcipher_alg serpent_algs[] = {
{
.base.cra_name = "__ecb(serpent)",
@ -185,21 +133,6 @@ static struct skcipher_alg serpent_algs[] = {
.setkey = serpent_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "__ctr(serpent)",
.base.cra_driver_name = "__ctr-serpent-sse2",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct serpent_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = SERPENT_MIN_KEY_SIZE,
.max_keysize = SERPENT_MAX_KEY_SIZE,
.ivsize = SERPENT_BLOCK_SIZE,
.chunksize = SERPENT_BLOCK_SIZE,
.setkey = serpent_setkey_skcipher,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
},
};

3
crypto/Kconfig
View File

@ -1539,6 +1539,7 @@ config CRYPTO_SERPENT_SSE2_X86_64
select CRYPTO_GLUE_HELPER_X86
select CRYPTO_SERPENT
select CRYPTO_SIMD
imply CRYPTO_CTR
help
Serpent cipher algorithm, by Anderson, Biham & Knudsen.
@ -1558,6 +1559,7 @@ config CRYPTO_SERPENT_SSE2_586
select CRYPTO_GLUE_HELPER_X86
select CRYPTO_SERPENT
select CRYPTO_SIMD
imply CRYPTO_CTR
help
Serpent cipher algorithm, by Anderson, Biham & Knudsen.
@ -1578,6 +1580,7 @@ config CRYPTO_SERPENT_AVX_X86_64
select CRYPTO_SERPENT
select CRYPTO_SIMD
imply CRYPTO_XTS
imply CRYPTO_CTR
help
Serpent cipher algorithm, by Anderson, Biham & Knudsen.