4a0ac0e975
The shash_alg structs for the four variants of BLAKE2s are identical except for the algorithm name, driver name, and digest size. So, avoid code duplication by using a macro to define these structs. Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> (cherry picked from commit 0d396058f92ae7e5ac62839fed54bc2bba630ab5) Bug: 152722841 Bug: 178411248 Change-Id: I32b3a6c035b18f063ad0e03c43171091ca1490a8 Signed-off-by: Eric Biggers <ebiggers@google.com>
137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <crypto/internal/blake2s.h>
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#include <crypto/internal/hash.h>
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#include <linux/types.h>
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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static int crypto_blake2s_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(tfm);
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if (keylen == 0 || keylen > BLAKE2S_KEY_SIZE) {
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crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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memcpy(tctx->key, key, keylen);
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tctx->keylen = keylen;
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return 0;
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}
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static int crypto_blake2s_init(struct shash_desc *desc)
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{
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struct blake2s_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
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struct blake2s_state *state = shash_desc_ctx(desc);
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const int outlen = crypto_shash_digestsize(desc->tfm);
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if (tctx->keylen)
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blake2s_init_key(state, outlen, tctx->key, tctx->keylen);
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else
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blake2s_init(state, outlen);
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return 0;
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}
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static int crypto_blake2s_update(struct shash_desc *desc, const u8 *in,
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unsigned int inlen)
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{
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struct blake2s_state *state = shash_desc_ctx(desc);
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const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
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if (unlikely(!inlen))
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return 0;
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if (inlen > fill) {
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memcpy(state->buf + state->buflen, in, fill);
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blake2s_compress_generic(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
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state->buflen = 0;
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in += fill;
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inlen -= fill;
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}
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if (inlen > BLAKE2S_BLOCK_SIZE) {
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const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
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/* Hash one less (full) block than strictly possible */
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blake2s_compress_generic(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
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in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
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inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
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}
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memcpy(state->buf + state->buflen, in, inlen);
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state->buflen += inlen;
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return 0;
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}
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static int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
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{
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struct blake2s_state *state = shash_desc_ctx(desc);
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blake2s_set_lastblock(state);
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memset(state->buf + state->buflen, 0,
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BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
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blake2s_compress_generic(state, state->buf, 1, state->buflen);
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cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
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memcpy(out, state->h, state->outlen);
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memzero_explicit(state, sizeof(*state));
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return 0;
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}
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#define BLAKE2S_ALG(name, driver_name, digest_size) \
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{ \
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.base.cra_name = name, \
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.base.cra_driver_name = driver_name, \
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.base.cra_priority = 100, \
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.base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, \
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.base.cra_blocksize = BLAKE2S_BLOCK_SIZE, \
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.base.cra_ctxsize = sizeof(struct blake2s_tfm_ctx), \
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.base.cra_module = THIS_MODULE, \
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.digestsize = digest_size, \
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.setkey = crypto_blake2s_setkey, \
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.init = crypto_blake2s_init, \
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.update = crypto_blake2s_update, \
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.final = crypto_blake2s_final, \
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.descsize = sizeof(struct blake2s_state), \
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}
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static struct shash_alg blake2s_algs[] = {
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BLAKE2S_ALG("blake2s-128", "blake2s-128-generic",
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BLAKE2S_128_HASH_SIZE),
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BLAKE2S_ALG("blake2s-160", "blake2s-160-generic",
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BLAKE2S_160_HASH_SIZE),
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BLAKE2S_ALG("blake2s-224", "blake2s-224-generic",
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BLAKE2S_224_HASH_SIZE),
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BLAKE2S_ALG("blake2s-256", "blake2s-256-generic",
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BLAKE2S_256_HASH_SIZE),
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};
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static int __init blake2s_mod_init(void)
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{
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return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
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}
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static void __exit blake2s_mod_exit(void)
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{
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crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
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}
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subsys_initcall(blake2s_mod_init);
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module_exit(blake2s_mod_exit);
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MODULE_ALIAS_CRYPTO("blake2s-128");
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MODULE_ALIAS_CRYPTO("blake2s-128-generic");
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MODULE_ALIAS_CRYPTO("blake2s-160");
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MODULE_ALIAS_CRYPTO("blake2s-160-generic");
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MODULE_ALIAS_CRYPTO("blake2s-224");
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MODULE_ALIAS_CRYPTO("blake2s-224-generic");
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MODULE_ALIAS_CRYPTO("blake2s-256");
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MODULE_ALIAS_CRYPTO("blake2s-256-generic");
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MODULE_LICENSE("GPL v2");
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