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crypto: polyval - Add POLYVAL support
Add support for POLYVAL, an ε-Δ-universal hash function similar to GHASH. This patch only uses POLYVAL as a component to implement HCTR2 mode. It should be noted that POLYVAL was originally specified for use in AES-GCM-SIV (RFC 8452), but the kernel does not currently support this mode. POLYVAL is implemented as an shash algorithm. The implementation is modified from ghash-generic.c. For more information on POLYVAL see: Length-preserving encryption with HCTR2: https://eprint.iacr.org/2021/1441.pdf AES-GCM-SIV: Nonce Misuse-Resistant Authenticated Encryption: https://datatracker.ietf.org/doc/html/rfc8452 Signed-off-by: Nathan Huckleberry <nhuck@google.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Nathan Huckleberry
Herbert Xu
parent
17fee07a2a
commit
f3c923a09c
@ -773,6 +773,14 @@ config CRYPTO_GHASH
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GHASH is the hash function used in GCM (Galois/Counter Mode).
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It is not a general-purpose cryptographic hash function.
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config CRYPTO_POLYVAL
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tristate
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select CRYPTO_GF128MUL
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select CRYPTO_HASH
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help
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POLYVAL is the hash function used in HCTR2. It is not a general-purpose
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cryptographic hash function.
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config CRYPTO_POLY1305
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tristate "Poly1305 authenticator algorithm"
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select CRYPTO_HASH
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@ -172,6 +172,7 @@ UBSAN_SANITIZE_jitterentropy.o = n
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jitterentropy_rng-y := jitterentropy.o jitterentropy-kcapi.o
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obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o
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obj-$(CONFIG_CRYPTO_GHASH) += ghash-generic.o
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obj-$(CONFIG_CRYPTO_POLYVAL) += polyval-generic.o
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obj-$(CONFIG_CRYPTO_USER_API) += af_alg.o
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obj-$(CONFIG_CRYPTO_USER_API_HASH) += algif_hash.o
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obj-$(CONFIG_CRYPTO_USER_API_SKCIPHER) += algif_skcipher.o
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205
crypto/polyval-generic.c
Normal file
205
crypto/polyval-generic.c
Normal file
@ -0,0 +1,205 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* POLYVAL: hash function for HCTR2.
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*
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* Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
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* Copyright (c) 2009 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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* Copyright 2021 Google LLC
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*/
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/*
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* Code based on crypto/ghash-generic.c
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*
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* POLYVAL is a keyed hash function similar to GHASH. POLYVAL uses a different
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* modulus for finite field multiplication which makes hardware accelerated
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* implementations on little-endian machines faster. POLYVAL is used in the
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* kernel to implement HCTR2, but was originally specified for AES-GCM-SIV
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* (RFC 8452).
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*
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* For more information see:
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* Length-preserving encryption with HCTR2:
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* https://eprint.iacr.org/2021/1441.pdf
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* AES-GCM-SIV: Nonce Misuse-Resistant Authenticated Encryption:
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* https://datatracker.ietf.org/doc/html/rfc8452
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*
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* Like GHASH, POLYVAL is not a cryptographic hash function and should
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* not be used outside of crypto modes explicitly designed to use POLYVAL.
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*
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* This implementation uses a convenient trick involving the GHASH and POLYVAL
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* fields. This trick allows multiplication in the POLYVAL field to be
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* implemented by using multiplication in the GHASH field as a subroutine. An
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* element of the POLYVAL field can be converted to an element of the GHASH
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* field by computing x*REVERSE(a), where REVERSE reverses the byte-ordering of
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* a. Similarly, an element of the GHASH field can be converted back to the
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* POLYVAL field by computing REVERSE(x^{-1}*a). For more information, see:
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* https://datatracker.ietf.org/doc/html/rfc8452#appendix-A
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*
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* By using this trick, we do not need to implement the POLYVAL field for the
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* generic implementation.
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*
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* Warning: this generic implementation is not intended to be used in practice
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* and is not constant time. For practical use, a hardware accelerated
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* implementation of POLYVAL should be used instead.
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*
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*/
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#include <asm/unaligned.h>
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#include <crypto/algapi.h>
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#include <crypto/gf128mul.h>
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#include <crypto/polyval.h>
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#include <crypto/internal/hash.h>
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#include <linux/crypto.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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struct polyval_tfm_ctx {
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struct gf128mul_4k *gf128;
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};
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struct polyval_desc_ctx {
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union {
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u8 buffer[POLYVAL_BLOCK_SIZE];
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be128 buffer128;
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};
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u32 bytes;
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};
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static void copy_and_reverse(u8 dst[POLYVAL_BLOCK_SIZE],
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const u8 src[POLYVAL_BLOCK_SIZE])
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{
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u64 a = get_unaligned((const u64 *)&src[0]);
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u64 b = get_unaligned((const u64 *)&src[8]);
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put_unaligned(swab64(a), (u64 *)&dst[8]);
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put_unaligned(swab64(b), (u64 *)&dst[0]);
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}
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static int polyval_setkey(struct crypto_shash *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct polyval_tfm_ctx *ctx = crypto_shash_ctx(tfm);
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be128 k;
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if (keylen != POLYVAL_BLOCK_SIZE)
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return -EINVAL;
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gf128mul_free_4k(ctx->gf128);
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BUILD_BUG_ON(sizeof(k) != POLYVAL_BLOCK_SIZE);
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copy_and_reverse((u8 *)&k, key);
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gf128mul_x_lle(&k, &k);
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ctx->gf128 = gf128mul_init_4k_lle(&k);
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memzero_explicit(&k, POLYVAL_BLOCK_SIZE);
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if (!ctx->gf128)
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return -ENOMEM;
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return 0;
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}
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static int polyval_init(struct shash_desc *desc)
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{
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struct polyval_desc_ctx *dctx = shash_desc_ctx(desc);
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memset(dctx, 0, sizeof(*dctx));
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return 0;
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}
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static int polyval_update(struct shash_desc *desc,
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const u8 *src, unsigned int srclen)
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{
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struct polyval_desc_ctx *dctx = shash_desc_ctx(desc);
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const struct polyval_tfm_ctx *ctx = crypto_shash_ctx(desc->tfm);
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u8 *pos;
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u8 tmp[POLYVAL_BLOCK_SIZE];
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int n;
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if (dctx->bytes) {
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n = min(srclen, dctx->bytes);
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pos = dctx->buffer + dctx->bytes - 1;
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dctx->bytes -= n;
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srclen -= n;
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while (n--)
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*pos-- ^= *src++;
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if (!dctx->bytes)
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gf128mul_4k_lle(&dctx->buffer128, ctx->gf128);
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}
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while (srclen >= POLYVAL_BLOCK_SIZE) {
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copy_and_reverse(tmp, src);
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crypto_xor(dctx->buffer, tmp, POLYVAL_BLOCK_SIZE);
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gf128mul_4k_lle(&dctx->buffer128, ctx->gf128);
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src += POLYVAL_BLOCK_SIZE;
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srclen -= POLYVAL_BLOCK_SIZE;
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}
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if (srclen) {
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dctx->bytes = POLYVAL_BLOCK_SIZE - srclen;
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pos = dctx->buffer + POLYVAL_BLOCK_SIZE - 1;
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while (srclen--)
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*pos-- ^= *src++;
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}
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return 0;
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}
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static int polyval_final(struct shash_desc *desc, u8 *dst)
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{
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struct polyval_desc_ctx *dctx = shash_desc_ctx(desc);
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const struct polyval_tfm_ctx *ctx = crypto_shash_ctx(desc->tfm);
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if (dctx->bytes)
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gf128mul_4k_lle(&dctx->buffer128, ctx->gf128);
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copy_and_reverse(dst, dctx->buffer);
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return 0;
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}
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static void polyval_exit_tfm(struct crypto_tfm *tfm)
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{
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struct polyval_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
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gf128mul_free_4k(ctx->gf128);
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}
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static struct shash_alg polyval_alg = {
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.digestsize = POLYVAL_DIGEST_SIZE,
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.init = polyval_init,
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.update = polyval_update,
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.final = polyval_final,
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.setkey = polyval_setkey,
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.descsize = sizeof(struct polyval_desc_ctx),
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.base = {
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.cra_name = "polyval",
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.cra_driver_name = "polyval-generic",
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.cra_priority = 100,
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.cra_blocksize = POLYVAL_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct polyval_tfm_ctx),
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.cra_module = THIS_MODULE,
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.cra_exit = polyval_exit_tfm,
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},
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};
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static int __init polyval_mod_init(void)
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{
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return crypto_register_shash(&polyval_alg);
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}
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static void __exit polyval_mod_exit(void)
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{
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crypto_unregister_shash(&polyval_alg);
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}
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subsys_initcall(polyval_mod_init);
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module_exit(polyval_mod_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("POLYVAL hash function");
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MODULE_ALIAS_CRYPTO("polyval");
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MODULE_ALIAS_CRYPTO("polyval-generic");
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@ -1730,6 +1730,10 @@ static int do_test(const char *alg, u32 type, u32 mask, int m, u32 num_mb)
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ret += tcrypt_test("ccm(sm4)");
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break;
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case 57:
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ret += tcrypt_test("polyval");
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break;
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case 100:
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ret += tcrypt_test("hmac(md5)");
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break;
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@ -5342,6 +5342,12 @@ static const struct alg_test_desc alg_test_descs[] = {
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.suite = {
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.hash = __VECS(poly1305_tv_template)
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}
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}, {
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.alg = "polyval",
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.test = alg_test_hash,
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.suite = {
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.hash = __VECS(polyval_tv_template)
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}
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}, {
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.alg = "rfc3686(ctr(aes))",
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.test = alg_test_skcipher,
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171
crypto/testmgr.h
171
crypto/testmgr.h
@ -34944,4 +34944,175 @@ static const struct cipher_testvec aes_xctr_tv_template[] = {
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};
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/*
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* Test vectors generated using https://github.com/google/hctr2
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*
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* To ensure compatibility with RFC 8452, some tests were sourced from
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* https://datatracker.ietf.org/doc/html/rfc8452
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*/
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static const struct hash_testvec polyval_tv_template[] = {
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{ // From RFC 8452
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.key = "\x31\x07\x28\xd9\x91\x1f\x1f\x38"
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"\x37\xb2\x43\x16\xc3\xfa\xb9\xa0",
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.plaintext = "\x65\x78\x61\x6d\x70\x6c\x65\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x48\x65\x6c\x6c\x6f\x20\x77\x6f"
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"\x72\x6c\x64\x00\x00\x00\x00\x00"
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"\x38\x00\x00\x00\x00\x00\x00\x00"
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"\x58\x00\x00\x00\x00\x00\x00\x00",
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.digest = "\xad\x7f\xcf\x0b\x51\x69\x85\x16"
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"\x62\x67\x2f\x3c\x5f\x95\x13\x8f",
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.psize = 48,
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.ksize = 16,
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},
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{ // From RFC 8452
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.key = "\xd9\xb3\x60\x27\x96\x94\x94\x1a"
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"\xc5\xdb\xc6\x98\x7a\xda\x73\x77",
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.plaintext = "\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.digest = "\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.psize = 16,
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.ksize = 16,
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},
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{ // From RFC 8452
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.key = "\xd9\xb3\x60\x27\x96\x94\x94\x1a"
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"\xc5\xdb\xc6\x98\x7a\xda\x73\x77",
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.plaintext = "\x01\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x40\x00\x00\x00\x00\x00\x00\x00",
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.digest = "\xeb\x93\xb7\x74\x09\x62\xc5\xe4"
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"\x9d\x2a\x90\xa7\xdc\x5c\xec\x74",
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.psize = 32,
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.ksize = 16,
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},
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{ // From RFC 8452
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.key = "\xd9\xb3\x60\x27\x96\x94\x94\x1a"
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"\xc5\xdb\xc6\x98\x7a\xda\x73\x77",
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.plaintext = "\x01\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x02\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x03\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x80\x01\x00\x00\x00\x00\x00\x00",
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.digest = "\x81\x38\x87\x46\xbc\x22\xd2\x6b"
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"\x2a\xbc\x3d\xcb\x15\x75\x42\x22",
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.psize = 64,
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.ksize = 16,
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},
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{ // From RFC 8452
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.key = "\xd9\xb3\x60\x27\x96\x94\x94\x1a"
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"\xc5\xdb\xc6\x98\x7a\xda\x73\x77",
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.plaintext = "\x01\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x02\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x03\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x04\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x02\x00\x00\x00\x00\x00\x00",
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.digest = "\x1e\x39\xb6\xd3\x34\x4d\x34\x8f"
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"\x60\x44\xf8\x99\x35\xd1\xcf\x78",
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.psize = 80,
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.ksize = 16,
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},
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{ // From RFC 8452
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.key = "\xd9\xb3\x60\x27\x96\x94\x94\x1a"
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"\xc5\xdb\xc6\x98\x7a\xda\x73\x77",
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.plaintext = "\x01\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x02\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x03\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x04\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x05\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x08\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x02\x00\x00\x00\x00\x00\x00",
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.digest = "\xff\xcd\x05\xd5\x77\x0f\x34\xad"
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"\x92\x67\xf0\xa5\x99\x94\xb1\x5a",
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.psize = 96,
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.ksize = 16,
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},
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{ // Random ( 1)
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.key = "\x90\xcc\xac\xee\xba\xd7\xd4\x68"
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"\x98\xa6\x79\x70\xdf\x66\x15\x6c",
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.plaintext = "",
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.digest = "\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.psize = 0,
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.ksize = 16,
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},
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{ // Random ( 1)
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.key = "\xc1\x45\x71\xf0\x30\x07\x94\xe7"
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"\x3a\xdd\xe4\xc6\x19\x2d\x02\xa2",
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.plaintext = "\xc1\x5d\x47\xc7\x4c\x7c\x5e\x07"
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"\x85\x14\x8f\x79\xcc\x73\x83\xf7"
|
||||
"\x35\xb8\xcb\x73\x61\xf0\x53\x31"
|
||||
"\xbf\x84\xde\xb6\xde\xaf\xb0\xb8"
|
||||
"\xb7\xd9\x11\x91\x89\xfd\x1e\x4c"
|
||||
"\x84\x4a\x1f\x2a\x87\xa4\xaf\x62"
|
||||
"\x8d\x7d\x58\xf6\x43\x35\xfc\x53"
|
||||
"\x8f\x1a\xf6\x12\xe1\x13\x3f\x66"
|
||||
"\x91\x4b\x13\xd6\x45\xfb\xb0\x7a"
|
||||
"\xe0\x8b\x8e\x99\xf7\x86\x46\x37"
|
||||
"\xd1\x22\x9e\x52\xf3\x3f\xd9\x75"
|
||||
"\x2c\x2c\xc6\xbb\x0e\x08\x14\x29"
|
||||
"\xe8\x50\x2f\xd8\xbe\xf4\xe9\x69"
|
||||
"\x4a\xee\xf7\xae\x15\x65\x35\x1e",
|
||||
.digest = "\x00\x4f\x5d\xe9\x3b\xc0\xd6\x50"
|
||||
"\x3e\x38\x73\x86\xc6\xda\xca\x7f",
|
||||
.psize = 112,
|
||||
.ksize = 16,
|
||||
},
|
||||
{ // Random ( 1)
|
||||
.key = "\x37\xbe\x68\x16\x50\xb9\x4e\xb0"
|
||||
"\x47\xde\xe2\xbd\xde\xe4\x48\x09",
|
||||
.plaintext = "\x87\xfc\x68\x9f\xff\xf2\x4a\x1e"
|
||||
"\x82\x3b\x73\x8f\xc1\xb2\x1b\x7a"
|
||||
"\x6c\x4f\x81\xbc\x88\x9b\x6c\xa3"
|
||||
"\x9c\xc2\xa5\xbc\x14\x70\x4c\x9b"
|
||||
"\x0c\x9f\x59\x92\x16\x4b\x91\x3d"
|
||||
"\x18\x55\x22\x68\x12\x8c\x63\xb2"
|
||||
"\x51\xcb\x85\x4b\xd2\xae\x0b\x1c"
|
||||
"\x5d\x28\x9d\x1d\xb1\xc8\xf0\x77"
|
||||
"\xe9\xb5\x07\x4e\x06\xc8\xee\xf8"
|
||||
"\x1b\xed\x72\x2a\x55\x7d\x16\xc9"
|
||||
"\xf2\x54\xe7\xe9\xe0\x44\x5b\x33"
|
||||
"\xb1\x49\xee\xff\x43\xfb\x82\xcd"
|
||||
"\x4a\x70\x78\x81\xa4\x34\x36\xe8"
|
||||
"\x4c\x28\x54\xa6\x6c\xc3\x6b\x78"
|
||||
"\xe7\xc0\x5d\xc6\x5d\x81\xab\x70"
|
||||
"\x08\x86\xa1\xfd\xf4\x77\x55\xfd"
|
||||
"\xa3\xe9\xe2\x1b\xdf\x99\xb7\x80"
|
||||
"\xf9\x0a\x4f\x72\x4a\xd3\xaf\xbb"
|
||||
"\xb3\x3b\xeb\x08\x58\x0f\x79\xce"
|
||||
"\xa5\x99\x05\x12\x34\xd4\xf4\x86"
|
||||
"\x37\x23\x1d\xc8\x49\xc0\x92\xae"
|
||||
"\xa6\xac\x9b\x31\x55\xed\x15\xc6"
|
||||
"\x05\x17\x37\x8d\x90\x42\xe4\x87"
|
||||
"\x89\x62\x88\x69\x1c\x6a\xfd\xe3"
|
||||
"\x00\x2b\x47\x1a\x73\xc1\x51\xc2"
|
||||
"\xc0\x62\x74\x6a\x9e\xb2\xe5\x21"
|
||||
"\xbe\x90\xb5\xb0\x50\xca\x88\x68"
|
||||
"\xe1\x9d\x7a\xdf\x6c\xb7\xb9\x98"
|
||||
"\xee\x28\x62\x61\x8b\xd1\x47\xf9"
|
||||
"\x04\x7a\x0b\x5d\xcd\x2b\x65\xf5"
|
||||
"\x12\xa3\xfe\x1a\xaa\x2c\x78\x42"
|
||||
"\xb8\xbe\x7d\x74\xeb\x59\xba\xba",
|
||||
.digest = "\xae\x11\xd4\x60\x2a\x5f\x9e\x42"
|
||||
"\x89\x04\xc2\x34\x8d\x55\x94\x0a",
|
||||
.psize = 256,
|
||||
.ksize = 16,
|
||||
},
|
||||
|
||||
};
|
||||
|
||||
#endif /* _CRYPTO_TESTMGR_H */
|
||||
|
||||
17
include/crypto/polyval.h
Normal file
17
include/crypto/polyval.h
Normal file
@ -0,0 +1,17 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* Common values for the Polyval hash algorithm
|
||||
*
|
||||
* Copyright 2021 Google LLC
|
||||
*/
|
||||
|
||||
#ifndef _CRYPTO_POLYVAL_H
|
||||
#define _CRYPTO_POLYVAL_H
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/crypto.h>
|
||||
|
||||
#define POLYVAL_BLOCK_SIZE 16
|
||||
#define POLYVAL_DIGEST_SIZE 16
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user