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![Eric Biggers](/assets/img/avatar_default.png)
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>
318 lines
9.2 KiB
C
318 lines
9.2 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
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/*
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* BLAKE2b reference source code package - reference C implementations
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*
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* Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under the
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* terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
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* your option. The terms of these licenses can be found at:
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*
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* - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
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* - OpenSSL license : https://www.openssl.org/source/license.html
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* - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
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*
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* More information about the BLAKE2 hash function can be found at
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* https://blake2.net.
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*
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* Note: the original sources have been modified for inclusion in linux kernel
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* in terms of coding style, using generic helpers and simplifications of error
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* handling.
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*/
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#include <asm/unaligned.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <crypto/internal/hash.h>
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#define BLAKE2B_160_DIGEST_SIZE (160 / 8)
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#define BLAKE2B_256_DIGEST_SIZE (256 / 8)
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#define BLAKE2B_384_DIGEST_SIZE (384 / 8)
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#define BLAKE2B_512_DIGEST_SIZE (512 / 8)
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enum blake2b_constant {
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BLAKE2B_BLOCKBYTES = 128,
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BLAKE2B_KEYBYTES = 64,
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};
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struct blake2b_state {
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u64 h[8];
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u64 t[2];
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u64 f[2];
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u8 buf[BLAKE2B_BLOCKBYTES];
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size_t buflen;
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};
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static const u64 blake2b_IV[8] = {
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0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
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0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
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0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
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0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
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};
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static const u8 blake2b_sigma[12][16] = {
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
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{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
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{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
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{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
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{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
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{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
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{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
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{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
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{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
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};
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static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
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{
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S->t[0] += inc;
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S->t[1] += (S->t[0] < inc);
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}
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#define G(r,i,a,b,c,d) \
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do { \
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a = a + b + m[blake2b_sigma[r][2*i+0]]; \
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d = ror64(d ^ a, 32); \
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c = c + d; \
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b = ror64(b ^ c, 24); \
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a = a + b + m[blake2b_sigma[r][2*i+1]]; \
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d = ror64(d ^ a, 16); \
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c = c + d; \
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b = ror64(b ^ c, 63); \
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} while (0)
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#define ROUND(r) \
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do { \
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G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
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G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
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G(r,2,v[ 2],v[ 6],v[10],v[14]); \
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G(r,3,v[ 3],v[ 7],v[11],v[15]); \
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G(r,4,v[ 0],v[ 5],v[10],v[15]); \
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G(r,5,v[ 1],v[ 6],v[11],v[12]); \
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G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
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G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
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} while (0)
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static void blake2b_compress(struct blake2b_state *S,
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const u8 block[BLAKE2B_BLOCKBYTES])
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{
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u64 m[16];
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u64 v[16];
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size_t i;
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for (i = 0; i < 16; ++i)
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m[i] = get_unaligned_le64(block + i * sizeof(m[i]));
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for (i = 0; i < 8; ++i)
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v[i] = S->h[i];
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v[ 8] = blake2b_IV[0];
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v[ 9] = blake2b_IV[1];
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v[10] = blake2b_IV[2];
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v[11] = blake2b_IV[3];
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v[12] = blake2b_IV[4] ^ S->t[0];
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v[13] = blake2b_IV[5] ^ S->t[1];
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v[14] = blake2b_IV[6] ^ S->f[0];
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v[15] = blake2b_IV[7] ^ S->f[1];
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ROUND(0);
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ROUND(1);
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ROUND(2);
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ROUND(3);
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ROUND(4);
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ROUND(5);
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ROUND(6);
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ROUND(7);
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ROUND(8);
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ROUND(9);
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ROUND(10);
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ROUND(11);
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for (i = 0; i < 8; ++i)
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S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
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}
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#undef G
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#undef ROUND
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struct blake2b_tfm_ctx {
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u8 key[BLAKE2B_KEYBYTES];
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unsigned int keylen;
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};
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static int blake2b_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
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if (keylen == 0 || keylen > BLAKE2B_KEYBYTES)
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return -EINVAL;
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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 blake2b_init(struct shash_desc *desc)
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{
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struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
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struct blake2b_state *state = shash_desc_ctx(desc);
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const int digestsize = crypto_shash_digestsize(desc->tfm);
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memset(state, 0, sizeof(*state));
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memcpy(state->h, blake2b_IV, sizeof(state->h));
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/* Parameter block is all zeros except index 0, no xor for 1..7 */
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state->h[0] ^= 0x01010000 | tctx->keylen << 8 | digestsize;
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if (tctx->keylen) {
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/*
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* Prefill the buffer with the key, next call to _update or
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* _final will process it
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*/
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memcpy(state->buf, tctx->key, tctx->keylen);
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state->buflen = BLAKE2B_BLOCKBYTES;
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}
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return 0;
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}
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static int blake2b_update(struct shash_desc *desc, const u8 *in,
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unsigned int inlen)
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{
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struct blake2b_state *state = shash_desc_ctx(desc);
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const size_t left = state->buflen;
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const size_t fill = BLAKE2B_BLOCKBYTES - left;
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if (!inlen)
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return 0;
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if (inlen > fill) {
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state->buflen = 0;
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/* Fill buffer */
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memcpy(state->buf + left, in, fill);
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blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
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/* Compress */
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blake2b_compress(state, state->buf);
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in += fill;
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inlen -= fill;
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while (inlen > BLAKE2B_BLOCKBYTES) {
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blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
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blake2b_compress(state, in);
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in += BLAKE2B_BLOCKBYTES;
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inlen -= BLAKE2B_BLOCKBYTES;
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}
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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 blake2b_final(struct shash_desc *desc, u8 *out)
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{
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struct blake2b_state *state = shash_desc_ctx(desc);
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const int digestsize = crypto_shash_digestsize(desc->tfm);
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size_t i;
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blake2b_increment_counter(state, state->buflen);
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/* Set last block */
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state->f[0] = (u64)-1;
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/* Padding */
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memset(state->buf + state->buflen, 0, BLAKE2B_BLOCKBYTES - state->buflen);
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blake2b_compress(state, state->buf);
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/* Avoid temporary buffer and switch the internal output to LE order */
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for (i = 0; i < ARRAY_SIZE(state->h); i++)
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__cpu_to_le64s(&state->h[i]);
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memcpy(out, state->h, digestsize);
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return 0;
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}
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static struct shash_alg blake2b_algs[] = {
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{
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.base.cra_name = "blake2b-160",
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.base.cra_driver_name = "blake2b-160-generic",
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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 = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_160_DIGEST_SIZE,
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.setkey = blake2b_setkey,
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.init = blake2b_init,
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.update = blake2b_update,
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.final = blake2b_final,
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.descsize = sizeof(struct blake2b_state),
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}, {
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.base.cra_name = "blake2b-256",
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.base.cra_driver_name = "blake2b-256-generic",
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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 = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_256_DIGEST_SIZE,
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.setkey = blake2b_setkey,
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.init = blake2b_init,
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.update = blake2b_update,
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.final = blake2b_final,
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.descsize = sizeof(struct blake2b_state),
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}, {
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.base.cra_name = "blake2b-384",
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.base.cra_driver_name = "blake2b-384-generic",
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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 = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_384_DIGEST_SIZE,
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.setkey = blake2b_setkey,
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.init = blake2b_init,
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.update = blake2b_update,
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.final = blake2b_final,
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.descsize = sizeof(struct blake2b_state),
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}, {
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.base.cra_name = "blake2b-512",
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.base.cra_driver_name = "blake2b-512-generic",
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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 = BLAKE2B_BLOCKBYTES,
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.base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx),
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.base.cra_module = THIS_MODULE,
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.digestsize = BLAKE2B_512_DIGEST_SIZE,
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.setkey = blake2b_setkey,
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.init = blake2b_init,
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.update = blake2b_update,
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.final = blake2b_final,
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.descsize = sizeof(struct blake2b_state),
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}
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};
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static int __init blake2b_mod_init(void)
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{
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return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
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}
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static void __exit blake2b_mod_fini(void)
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{
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crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
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}
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subsys_initcall(blake2b_mod_init);
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module_exit(blake2b_mod_fini);
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MODULE_AUTHOR("David Sterba <kdave@kernel.org>");
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MODULE_DESCRIPTION("BLAKE2b generic implementation");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("blake2b-160");
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MODULE_ALIAS_CRYPTO("blake2b-160-generic");
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MODULE_ALIAS_CRYPTO("blake2b-256");
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MODULE_ALIAS_CRYPTO("blake2b-256-generic");
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MODULE_ALIAS_CRYPTO("blake2b-384");
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MODULE_ALIAS_CRYPTO("blake2b-384-generic");
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MODULE_ALIAS_CRYPTO("blake2b-512");
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MODULE_ALIAS_CRYPTO("blake2b-512-generic");
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