mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
4d2fa8b44b
Pull crypto updates from Herbert Xu: "Here is the crypto update for 5.3: API: - Test shash interface directly in testmgr - cra_driver_name is now mandatory Algorithms: - Replace arc4 crypto_cipher with library helper - Implement 5 way interleave for ECB, CBC and CTR on arm64 - Add xxhash - Add continuous self-test on noise source to drbg - Update jitter RNG Drivers: - Add support for SHA204A random number generator - Add support for 7211 in iproc-rng200 - Fix fuzz test failures in inside-secure - Fix fuzz test failures in talitos - Fix fuzz test failures in qat" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (143 commits) crypto: stm32/hash - remove interruptible condition for dma crypto: stm32/hash - Fix hmac issue more than 256 bytes crypto: stm32/crc32 - rename driver file crypto: amcc - remove memset after dma_alloc_coherent crypto: ccp - Switch to SPDX license identifiers crypto: ccp - Validate the the error value used to index error messages crypto: doc - Fix formatting of new crypto engine content crypto: doc - Add parameter documentation crypto: arm64/aes-ce - implement 5 way interleave for ECB, CBC and CTR crypto: arm64/aes-ce - add 5 way interleave routines crypto: talitos - drop icv_ool crypto: talitos - fix hash on SEC1. crypto: talitos - move struct talitos_edesc into talitos.h lib/scatterlist: Fix mapping iterator when sg->offset is greater than PAGE_SIZE crypto/NX: Set receive window credits to max number of CRBs in RxFIFO crypto: asymmetric_keys - select CRYPTO_HASH where needed crypto: serpent - mark __serpent_setkey_sbox noinline crypto: testmgr - dynamically allocate crypto_shash crypto: testmgr - dynamically allocate testvec_config crypto: talitos - eliminate unneeded 'done' functions at build time ...
212 lines
5.8 KiB
C
212 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* ChaCha and XChaCha stream ciphers, including ChaCha20 (RFC7539)
|
|
*
|
|
* Copyright (C) 2015 Martin Willi
|
|
* Copyright (C) 2018 Google LLC
|
|
*/
|
|
|
|
#include <asm/unaligned.h>
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/chacha.h>
|
|
#include <crypto/internal/skcipher.h>
|
|
#include <linux/module.h>
|
|
|
|
static void chacha_docrypt(u32 *state, u8 *dst, const u8 *src,
|
|
unsigned int bytes, int nrounds)
|
|
{
|
|
/* aligned to potentially speed up crypto_xor() */
|
|
u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long));
|
|
|
|
while (bytes >= CHACHA_BLOCK_SIZE) {
|
|
chacha_block(state, stream, nrounds);
|
|
crypto_xor_cpy(dst, src, stream, CHACHA_BLOCK_SIZE);
|
|
bytes -= CHACHA_BLOCK_SIZE;
|
|
dst += CHACHA_BLOCK_SIZE;
|
|
src += CHACHA_BLOCK_SIZE;
|
|
}
|
|
if (bytes) {
|
|
chacha_block(state, stream, nrounds);
|
|
crypto_xor_cpy(dst, src, stream, bytes);
|
|
}
|
|
}
|
|
|
|
static int chacha_stream_xor(struct skcipher_request *req,
|
|
const struct chacha_ctx *ctx, const u8 *iv)
|
|
{
|
|
struct skcipher_walk walk;
|
|
u32 state[16];
|
|
int err;
|
|
|
|
err = skcipher_walk_virt(&walk, req, false);
|
|
|
|
crypto_chacha_init(state, ctx, iv);
|
|
|
|
while (walk.nbytes > 0) {
|
|
unsigned int nbytes = walk.nbytes;
|
|
|
|
if (nbytes < walk.total)
|
|
nbytes = round_down(nbytes, CHACHA_BLOCK_SIZE);
|
|
|
|
chacha_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr,
|
|
nbytes, ctx->nrounds);
|
|
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
void crypto_chacha_init(u32 *state, const struct chacha_ctx *ctx, const u8 *iv)
|
|
{
|
|
state[0] = 0x61707865; /* "expa" */
|
|
state[1] = 0x3320646e; /* "nd 3" */
|
|
state[2] = 0x79622d32; /* "2-by" */
|
|
state[3] = 0x6b206574; /* "te k" */
|
|
state[4] = ctx->key[0];
|
|
state[5] = ctx->key[1];
|
|
state[6] = ctx->key[2];
|
|
state[7] = ctx->key[3];
|
|
state[8] = ctx->key[4];
|
|
state[9] = ctx->key[5];
|
|
state[10] = ctx->key[6];
|
|
state[11] = ctx->key[7];
|
|
state[12] = get_unaligned_le32(iv + 0);
|
|
state[13] = get_unaligned_le32(iv + 4);
|
|
state[14] = get_unaligned_le32(iv + 8);
|
|
state[15] = get_unaligned_le32(iv + 12);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_chacha_init);
|
|
|
|
static int chacha_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
|
unsigned int keysize, int nrounds)
|
|
{
|
|
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
|
|
int i;
|
|
|
|
if (keysize != CHACHA_KEY_SIZE)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ctx->key); i++)
|
|
ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32));
|
|
|
|
ctx->nrounds = nrounds;
|
|
return 0;
|
|
}
|
|
|
|
int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
|
unsigned int keysize)
|
|
{
|
|
return chacha_setkey(tfm, key, keysize, 20);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_chacha20_setkey);
|
|
|
|
int crypto_chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
|
unsigned int keysize)
|
|
{
|
|
return chacha_setkey(tfm, key, keysize, 12);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_chacha12_setkey);
|
|
|
|
int crypto_chacha_crypt(struct skcipher_request *req)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
|
|
|
|
return chacha_stream_xor(req, ctx, req->iv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_chacha_crypt);
|
|
|
|
int crypto_xchacha_crypt(struct skcipher_request *req)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
|
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
|
|
struct chacha_ctx subctx;
|
|
u32 state[16];
|
|
u8 real_iv[16];
|
|
|
|
/* Compute the subkey given the original key and first 128 nonce bits */
|
|
crypto_chacha_init(state, ctx, req->iv);
|
|
hchacha_block(state, subctx.key, ctx->nrounds);
|
|
subctx.nrounds = ctx->nrounds;
|
|
|
|
/* Build the real IV */
|
|
memcpy(&real_iv[0], req->iv + 24, 8); /* stream position */
|
|
memcpy(&real_iv[8], req->iv + 16, 8); /* remaining 64 nonce bits */
|
|
|
|
/* Generate the stream and XOR it with the data */
|
|
return chacha_stream_xor(req, &subctx, real_iv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_xchacha_crypt);
|
|
|
|
static struct skcipher_alg algs[] = {
|
|
{
|
|
.base.cra_name = "chacha20",
|
|
.base.cra_driver_name = "chacha20-generic",
|
|
.base.cra_priority = 100,
|
|
.base.cra_blocksize = 1,
|
|
.base.cra_ctxsize = sizeof(struct chacha_ctx),
|
|
.base.cra_module = THIS_MODULE,
|
|
|
|
.min_keysize = CHACHA_KEY_SIZE,
|
|
.max_keysize = CHACHA_KEY_SIZE,
|
|
.ivsize = CHACHA_IV_SIZE,
|
|
.chunksize = CHACHA_BLOCK_SIZE,
|
|
.setkey = crypto_chacha20_setkey,
|
|
.encrypt = crypto_chacha_crypt,
|
|
.decrypt = crypto_chacha_crypt,
|
|
}, {
|
|
.base.cra_name = "xchacha20",
|
|
.base.cra_driver_name = "xchacha20-generic",
|
|
.base.cra_priority = 100,
|
|
.base.cra_blocksize = 1,
|
|
.base.cra_ctxsize = sizeof(struct chacha_ctx),
|
|
.base.cra_module = THIS_MODULE,
|
|
|
|
.min_keysize = CHACHA_KEY_SIZE,
|
|
.max_keysize = CHACHA_KEY_SIZE,
|
|
.ivsize = XCHACHA_IV_SIZE,
|
|
.chunksize = CHACHA_BLOCK_SIZE,
|
|
.setkey = crypto_chacha20_setkey,
|
|
.encrypt = crypto_xchacha_crypt,
|
|
.decrypt = crypto_xchacha_crypt,
|
|
}, {
|
|
.base.cra_name = "xchacha12",
|
|
.base.cra_driver_name = "xchacha12-generic",
|
|
.base.cra_priority = 100,
|
|
.base.cra_blocksize = 1,
|
|
.base.cra_ctxsize = sizeof(struct chacha_ctx),
|
|
.base.cra_module = THIS_MODULE,
|
|
|
|
.min_keysize = CHACHA_KEY_SIZE,
|
|
.max_keysize = CHACHA_KEY_SIZE,
|
|
.ivsize = XCHACHA_IV_SIZE,
|
|
.chunksize = CHACHA_BLOCK_SIZE,
|
|
.setkey = crypto_chacha12_setkey,
|
|
.encrypt = crypto_xchacha_crypt,
|
|
.decrypt = crypto_xchacha_crypt,
|
|
}
|
|
};
|
|
|
|
static int __init chacha_generic_mod_init(void)
|
|
{
|
|
return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
|
|
}
|
|
|
|
static void __exit chacha_generic_mod_fini(void)
|
|
{
|
|
crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
|
|
}
|
|
|
|
subsys_initcall(chacha_generic_mod_init);
|
|
module_exit(chacha_generic_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
|
|
MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (generic)");
|
|
MODULE_ALIAS_CRYPTO("chacha20");
|
|
MODULE_ALIAS_CRYPTO("chacha20-generic");
|
|
MODULE_ALIAS_CRYPTO("xchacha20");
|
|
MODULE_ALIAS_CRYPTO("xchacha20-generic");
|
|
MODULE_ALIAS_CRYPTO("xchacha12");
|
|
MODULE_ALIAS_CRYPTO("xchacha12-generic");
|