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linux-next/arch/x86/crypto/camellia_aesni_avx_glue.c
Eric Biggers 674f368a95 crypto: remove CRYPTO_TFM_RES_BAD_KEY_LEN 
The CRYPTO_TFM_RES_BAD_KEY_LEN flag was apparently meant as a way to
make the ->setkey() functions provide more information about errors.

However, no one actually checks for this flag, which makes it pointless.

Also, many algorithms fail to set this flag when given a bad length key.
Reviewing just the generic implementations, this is the case for
aes-fixed-time, cbcmac, echainiv, nhpoly1305, pcrypt, rfc3686, rfc4309,
rfc7539, rfc7539esp, salsa20, seqiv, and xcbc.  But there are probably
many more in arch/*/crypto/ and drivers/crypto/.

Some algorithms can even set this flag when the key is the correct
length.  For example, authenc and authencesn set it when the key payload
is malformed in any way (not just a bad length), the atmel-sha and ccree
drivers can set it if a memory allocation fails, and the chelsio driver
sets it for bad auth tag lengths, not just bad key lengths.

So even if someone actually wanted to start checking this flag (which
seems unlikely, since it's been unused for a long time), there would be
a lot of work needed to get it working correctly.  But it would probably
be much better to go back to the drawing board and just define different
return values, like -EINVAL if the key is invalid for the algorithm vs.
-EKEYREJECTED if the key was rejected by a policy like "no weak keys".
That would be much simpler, less error-prone, and easier to test.

So just remove this flag.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2020-01-09 11:30:53 +08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue Code for x86_64/AVX/AES-NI assembler optimized version of Camellia
*
* Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*/
#include <asm/crypto/camellia.h>
#include <asm/crypto/glue_helper.h>
#include <crypto/algapi.h>
#include <crypto/internal/simd.h>
#include <crypto/xts.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/types.h>
#define CAMELLIA_AESNI_PARALLEL_BLOCKS 16
/* 16-way parallel cipher functions (avx/aes-ni) */
asmlinkage void camellia_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src);
EXPORT_SYMBOL_GPL(camellia_ecb_enc_16way);
asmlinkage void camellia_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src);
EXPORT_SYMBOL_GPL(camellia_ecb_dec_16way);
asmlinkage void camellia_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src);
EXPORT_SYMBOL_GPL(camellia_cbc_dec_16way);
asmlinkage void camellia_ctr_16way(const void *ctx, u8 *dst, const u8 *src,
le128 *iv);
EXPORT_SYMBOL_GPL(camellia_ctr_16way);
asmlinkage void camellia_xts_enc_16way(const void *ctx, u8 *dst, const u8 *src,
le128 *iv);
EXPORT_SYMBOL_GPL(camellia_xts_enc_16way);
asmlinkage void camellia_xts_dec_16way(const void *ctx, u8 *dst, const u8 *src,
le128 *iv);
EXPORT_SYMBOL_GPL(camellia_xts_dec_16way);
void camellia_xts_enc(const void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
glue_xts_crypt_128bit_one(ctx, dst, src, iv, camellia_enc_blk);
}
EXPORT_SYMBOL_GPL(camellia_xts_enc);
void camellia_xts_dec(const void *ctx, u8 *dst, const u8 *src, le128 *iv)
{
glue_xts_crypt_128bit_one(ctx, dst, src, iv, camellia_dec_blk);
}
EXPORT_SYMBOL_GPL(camellia_xts_dec);
static const struct common_glue_ctx camellia_enc = {
.num_funcs = 3,
.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.fn_u = { .ecb = camellia_ecb_enc_16way }
}, {
.num_blocks = 2,
.fn_u = { .ecb = camellia_enc_blk_2way }
}, {
.num_blocks = 1,
.fn_u = { .ecb = camellia_enc_blk }
} }
};
static const struct common_glue_ctx camellia_ctr = {
.num_funcs = 3,
.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.fn_u = { .ctr = camellia_ctr_16way }
}, {
.num_blocks = 2,
.fn_u = { .ctr = camellia_crypt_ctr_2way }
}, {
.num_blocks = 1,
.fn_u = { .ctr = camellia_crypt_ctr }
} }
};
static const struct common_glue_ctx camellia_enc_xts = {
.num_funcs = 2,
.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.fn_u = { .xts = camellia_xts_enc_16way }
}, {
.num_blocks = 1,
.fn_u = { .xts = camellia_xts_enc }
} }
};
static const struct common_glue_ctx camellia_dec = {
.num_funcs = 3,
.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.fn_u = { .ecb = camellia_ecb_dec_16way }
}, {
.num_blocks = 2,
.fn_u = { .ecb = camellia_dec_blk_2way }
}, {
.num_blocks = 1,
.fn_u = { .ecb = camellia_dec_blk }
} }
};
static const struct common_glue_ctx camellia_dec_cbc = {
.num_funcs = 3,
.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.fn_u = { .cbc = camellia_cbc_dec_16way }
}, {
.num_blocks = 2,
.fn_u = { .cbc = camellia_decrypt_cbc_2way }
}, {
.num_blocks = 1,
.fn_u = { .cbc = camellia_dec_blk }
} }
};
static const struct common_glue_ctx camellia_dec_xts = {
.num_funcs = 2,
.fpu_blocks_limit = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = CAMELLIA_AESNI_PARALLEL_BLOCKS,
.fn_u = { .xts = camellia_xts_dec_16way }
}, {
.num_blocks = 1,
.fn_u = { .xts = camellia_xts_dec }
} }
};
static int camellia_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
return __camellia_setkey(crypto_skcipher_ctx(tfm), key, keylen);
}
static int ecb_encrypt(struct skcipher_request *req)
{
return glue_ecb_req_128bit(&camellia_enc, req);
}
static int ecb_decrypt(struct skcipher_request *req)
{
return glue_ecb_req_128bit(&camellia_dec, req);
}
static int cbc_encrypt(struct skcipher_request *req)
{
return glue_cbc_encrypt_req_128bit(camellia_enc_blk, req);
}
static int cbc_decrypt(struct skcipher_request *req)
{
return glue_cbc_decrypt_req_128bit(&camellia_dec_cbc, req);
}
static int ctr_crypt(struct skcipher_request *req)
{
return glue_ctr_req_128bit(&camellia_ctr, req);
}
int xts_camellia_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct camellia_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
int err;
err = xts_verify_key(tfm, key, keylen);
if (err)
return err;
/* first half of xts-key is for crypt */
err = __camellia_setkey(&ctx->crypt_ctx, key, keylen / 2);
if (err)
return err;
/* second half of xts-key is for tweak */
return __camellia_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
}
EXPORT_SYMBOL_GPL(xts_camellia_setkey);
static int xts_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct camellia_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
return glue_xts_req_128bit(&camellia_enc_xts, req, camellia_enc_blk,
&ctx->tweak_ctx, &ctx->crypt_ctx, false);
}
static int xts_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct camellia_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
return glue_xts_req_128bit(&camellia_dec_xts, req, camellia_enc_blk,
&ctx->tweak_ctx, &ctx->crypt_ctx, true);
}
static struct skcipher_alg camellia_algs[] = {
{
.base.cra_name = "__ecb(camellia)",
.base.cra_driver_name = "__ecb-camellia-aesni",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = CAMELLIA_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct camellia_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = CAMELLIA_MIN_KEY_SIZE,
.max_keysize = CAMELLIA_MAX_KEY_SIZE,
.setkey = camellia_setkey,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
}, {
.base.cra_name = "__cbc(camellia)",
.base.cra_driver_name = "__cbc-camellia-aesni",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = CAMELLIA_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct camellia_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = CAMELLIA_MIN_KEY_SIZE,
.max_keysize = CAMELLIA_MAX_KEY_SIZE,
.ivsize = CAMELLIA_BLOCK_SIZE,
.setkey = camellia_setkey,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "__ctr(camellia)",
.base.cra_driver_name = "__ctr-camellia-aesni",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct camellia_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = CAMELLIA_MIN_KEY_SIZE,
.max_keysize = CAMELLIA_MAX_KEY_SIZE,
.ivsize = CAMELLIA_BLOCK_SIZE,
.chunksize = CAMELLIA_BLOCK_SIZE,
.setkey = camellia_setkey,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
}, {
.base.cra_name = "__xts(camellia)",
.base.cra_driver_name = "__xts-camellia-aesni",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.base.cra_blocksize = CAMELLIA_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct camellia_xts_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = 2 * CAMELLIA_MIN_KEY_SIZE,
.max_keysize = 2 * CAMELLIA_MAX_KEY_SIZE,
.ivsize = CAMELLIA_BLOCK_SIZE,
.setkey = xts_camellia_setkey,
.encrypt = xts_encrypt,
.decrypt = xts_decrypt,
},
};
static struct simd_skcipher_alg *camellia_simd_algs[ARRAY_SIZE(camellia_algs)];
static int __init camellia_aesni_init(void)
{
const char *feature_name;
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AES) ||
!boot_cpu_has(X86_FEATURE_OSXSAVE)) {
pr_info("AVX or AES-NI instructions are not detected.\n");
return -ENODEV;
}
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
&feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
return simd_register_skciphers_compat(camellia_algs,
ARRAY_SIZE(camellia_algs),
camellia_simd_algs);
}
static void __exit camellia_aesni_fini(void)
{
simd_unregister_skciphers(camellia_algs, ARRAY_SIZE(camellia_algs),
camellia_simd_algs);
}
module_init(camellia_aesni_init);
module_exit(camellia_aesni_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Camellia Cipher Algorithm, AES-NI/AVX optimized");
MODULE_ALIAS_CRYPTO("camellia");
MODULE_ALIAS_CRYPTO("camellia-asm");
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