crypto: blake2b - add blake2b generic implementation

The patch brings support of several BLAKE2 variants (2b with various
digest lengths).  The keyed digest is supported, using tfm->setkey call.
The in-tree user will be btrfs (for checksumming), we're going to use
the BLAKE2b-256 variant.

The code is reference implementation taken from the official sources and
modified in terms of kernel coding style (whitespace, comments, uintXX_t
-> uXX types, removed unused prototypes and #ifdefs, removed testing
code, changed secure_zero_memory -> memzero_explicit, used own helpers
for unaligned reads/writes and rotations).

Further changes removed sanity checks of key length or output size,
these values are verified in the crypto API callbacks or hardcoded in
shash_alg and not exposed to users.

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 435 insertions, 0 deletions

diff --git a/crypto/blake2b_generic.c b/crypto/blake2b_generic.c
new file mode 100644
index 000000000000..8dab65612a41
--- /dev/null
+++ b/crypto/blake2b_generic.c
@@ -0,0 +1,435 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR Apache-2.0)
+/*
+ * BLAKE2b reference source code package - reference C implementations
+ *
+ * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
+ * terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
+ * your option.  The terms of these licenses can be found at:
+ *
+ * - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
+ * - OpenSSL license   : https://www.openssl.org/source/license.html
+ * - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * More information about the BLAKE2 hash function can be found at
+ * https://blake2.net.
+ *
+ * Note: the original sources have been modified for inclusion in linux kernel
+ * in terms of coding style, using generic helpers and simplifications of error
+ * handling.
+ */
+
+#include <asm/unaligned.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <crypto/internal/hash.h>
+
+#define BLAKE2B_160_DIGEST_SIZE		(160 / 8)
+#define BLAKE2B_256_DIGEST_SIZE		(256 / 8)
+#define BLAKE2B_384_DIGEST_SIZE		(384 / 8)
+#define BLAKE2B_512_DIGEST_SIZE		(512 / 8)
+
+enum blake2b_constant {
+	BLAKE2B_BLOCKBYTES    = 128,
+	BLAKE2B_OUTBYTES      = 64,
+	BLAKE2B_KEYBYTES      = 64,
+	BLAKE2B_SALTBYTES     = 16,
+	BLAKE2B_PERSONALBYTES = 16
+};
+
+struct blake2b_state {
+	u64      h[8];
+	u64      t[2];
+	u64      f[2];
+	u8       buf[BLAKE2B_BLOCKBYTES];
+	size_t   buflen;
+	size_t   outlen;
+	u8       last_node;
+};
+
+struct blake2b_param {
+	u8 digest_length;			/* 1 */
+	u8 key_length;				/* 2 */
+	u8 fanout;				/* 3 */
+	u8 depth;				/* 4 */
+	__le32 leaf_length;			/* 8 */
+	__le32 node_offset;			/* 12 */
+	__le32 xof_length;			/* 16 */
+	u8 node_depth;				/* 17 */
+	u8 inner_length;			/* 18 */
+	u8 reserved[14];			/* 32 */
+	u8 salt[BLAKE2B_SALTBYTES];		/* 48 */
+	u8 personal[BLAKE2B_PERSONALBYTES];	/* 64 */
+} __packed;
+
+static const u64 blake2b_IV[8] = {
+	0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
+	0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
+	0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
+	0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
+};
+
+static const u8 blake2b_sigma[12][16] = {
+	{  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
+	{ 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 },
+	{ 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 },
+	{  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 },
+	{  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 },
+	{  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 },
+	{ 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 },
+	{ 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 },
+	{  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 },
+	{ 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13,  0 },
+	{  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 },
+	{ 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 }
+};
+
+static void blake2b_update(struct blake2b_state *S, const void *pin, size_t inlen);
+
+static void blake2b_set_lastnode(struct blake2b_state *S)
+{
+	S->f[1] = (u64)-1;
+}
+
+static void blake2b_set_lastblock(struct blake2b_state *S)
+{
+	if (S->last_node)
+		blake2b_set_lastnode(S);
+
+	S->f[0] = (u64)-1;
+}
+
+static void blake2b_increment_counter(struct blake2b_state *S, const u64 inc)
+{
+	S->t[0] += inc;
+	S->t[1] += (S->t[0] < inc);
+}
+
+static void blake2b_init0(struct blake2b_state *S)
+{
+	size_t i;
+
+	memset(S, 0, sizeof(struct blake2b_state));
+
+	for (i = 0; i < 8; ++i)
+		S->h[i] = blake2b_IV[i];
+}
+
+/* init xors IV with input parameter block */
+static void blake2b_init_param(struct blake2b_state *S,
+			       const struct blake2b_param *P)
+{
+	const u8 *p = (const u8 *)(P);
+	size_t i;
+
+	blake2b_init0(S);
+
+	/* IV XOR ParamBlock */
+	for (i = 0; i < 8; ++i)
+		S->h[i] ^= get_unaligned_le64(p + sizeof(S->h[i]) * i);
+
+	S->outlen = P->digest_length;
+}
+
+static void blake2b_init(struct blake2b_state *S, size_t outlen)
+{
+	struct blake2b_param P;
+
+	P.digest_length = (u8)outlen;
+	P.key_length    = 0;
+	P.fanout        = 1;
+	P.depth         = 1;
+	P.leaf_length   = 0;
+	P.node_offset   = 0;
+	P.xof_length    = 0;
+	P.node_depth    = 0;
+	P.inner_length  = 0;
+	memset(P.reserved, 0, sizeof(P.reserved));
+	memset(P.salt,     0, sizeof(P.salt));
+	memset(P.personal, 0, sizeof(P.personal));
+	blake2b_init_param(S, &P);
+}
+
+static void blake2b_init_key(struct blake2b_state *S, size_t outlen,
+			     const void *key, size_t keylen)
+{
+	struct blake2b_param P;
+
+	P.digest_length = (u8)outlen;
+	P.key_length    = (u8)keylen;
+	P.fanout        = 1;
+	P.depth         = 1;
+	P.leaf_length   = 0;
+	P.node_offset   = 0;
+	P.xof_length    = 0;
+	P.node_depth    = 0;
+	P.inner_length  = 0;
+	memset(P.reserved, 0, sizeof(P.reserved));
+	memset(P.salt,     0, sizeof(P.salt));
+	memset(P.personal, 0, sizeof(P.personal));
+
+	blake2b_init_param(S, &P);
+
+	{
+		u8 block[BLAKE2B_BLOCKBYTES];
+
+		memset(block, 0, BLAKE2B_BLOCKBYTES);
+		memcpy(block, key, keylen);
+		blake2b_update(S, block, BLAKE2B_BLOCKBYTES);
+		memzero_explicit(block, BLAKE2B_BLOCKBYTES);
+	}
+}
+
+#define G(r,i,a,b,c,d)                                  \
+	do {                                            \
+		a = a + b + m[blake2b_sigma[r][2*i+0]]; \
+		d = ror64(d ^ a, 32);                   \
+		c = c + d;                              \
+		b = ror64(b ^ c, 24);                   \
+		a = a + b + m[blake2b_sigma[r][2*i+1]]; \
+		d = ror64(d ^ a, 16);                   \
+		c = c + d;                              \
+		b = ror64(b ^ c, 63);                   \
+	} while (0)
+
+#define ROUND(r)                                \
+	do {                                    \
+		G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
+		G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
+		G(r,2,v[ 2],v[ 6],v[10],v[14]); \
+		G(r,3,v[ 3],v[ 7],v[11],v[15]); \
+		G(r,4,v[ 0],v[ 5],v[10],v[15]); \
+		G(r,5,v[ 1],v[ 6],v[11],v[12]); \
+		G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
+		G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
+	} while (0)
+
+static void blake2b_compress(struct blake2b_state *S,
+			     const u8 block[BLAKE2B_BLOCKBYTES])
+{
+	u64 m[16];
+	u64 v[16];
+	size_t i;
+
+	for (i = 0; i < 16; ++i)
+		m[i] = get_unaligned_le64(block + i * sizeof(m[i]));
+
+	for (i = 0; i < 8; ++i)
+		v[i] = S->h[i];
+
+	v[ 8] = blake2b_IV[0];
+	v[ 9] = blake2b_IV[1];
+	v[10] = blake2b_IV[2];
+	v[11] = blake2b_IV[3];
+	v[12] = blake2b_IV[4] ^ S->t[0];
+	v[13] = blake2b_IV[5] ^ S->t[1];
+	v[14] = blake2b_IV[6] ^ S->f[0];
+	v[15] = blake2b_IV[7] ^ S->f[1];
+
+	ROUND(0);
+	ROUND(1);
+	ROUND(2);
+	ROUND(3);
+	ROUND(4);
+	ROUND(5);
+	ROUND(6);
+	ROUND(7);
+	ROUND(8);
+	ROUND(9);
+	ROUND(10);
+	ROUND(11);
+
+	for (i = 0; i < 8; ++i)
+		S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
+}
+
+#undef G
+#undef ROUND
+
+static void blake2b_update(struct blake2b_state *S, const void *pin, size_t inlen)
+{
+	const u8 *in = (const u8 *)pin;
+
+	if (inlen > 0) {
+		size_t left = S->buflen;
+		size_t fill = BLAKE2B_BLOCKBYTES - left;
+
+		if (inlen > fill) {
+			S->buflen = 0;
+			/* Fill buffer */
+			memcpy(S->buf + left, in, fill);
+			blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
+			/* Compress */
+			blake2b_compress(S, S->buf);
+			in += fill;
+			inlen -= fill;
+			while (inlen > BLAKE2B_BLOCKBYTES) {
+				blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
+				blake2b_compress(S, in);
+				in += BLAKE2B_BLOCKBYTES;
+				inlen -= BLAKE2B_BLOCKBYTES;
+			}
+		}
+		memcpy(S->buf + S->buflen, in, inlen);
+		S->buflen += inlen;
+	}
+}
+
+static void blake2b_final(struct blake2b_state *S, void *out, size_t outlen)
+{
+	u8 buffer[BLAKE2B_OUTBYTES] = {0};
+	size_t i;
+
+	blake2b_increment_counter(S, S->buflen);
+	blake2b_set_lastblock(S);
+	/* Padding */
+	memset(S->buf + S->buflen, 0, BLAKE2B_BLOCKBYTES - S->buflen);
+	blake2b_compress(S, S->buf);
+
+	/* Output full hash to temp buffer */
+	for (i = 0; i < 8; ++i)
+		put_unaligned_le64(S->h[i], buffer + sizeof(S->h[i]) * i);
+
+	memcpy(out, buffer, S->outlen);
+	memzero_explicit(buffer, sizeof(buffer));
+}
+
+struct digest_tfm_ctx {
+	u8 key[BLAKE2B_KEYBYTES];
+	unsigned int keylen;
+};
+
+static int digest_setkey(struct crypto_shash *tfm, const u8 *key,
+			 unsigned int keylen)
+{
+	struct digest_tfm_ctx *mctx = crypto_shash_ctx(tfm);
+
+	if (keylen == 0 || keylen > BLAKE2B_KEYBYTES) {
+		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
+	memcpy(mctx->key, key, keylen);
+	mctx->keylen = keylen;
+
+	return 0;
+}
+
+static int digest_init(struct shash_desc *desc)
+{
+	struct digest_tfm_ctx *mctx = crypto_shash_ctx(desc->tfm);
+	struct blake2b_state *state = shash_desc_ctx(desc);
+	const int digestsize = crypto_shash_digestsize(desc->tfm);
+
+	if (mctx->keylen == 0)
+		blake2b_init(state, digestsize);
+	else
+		blake2b_init_key(state, digestsize, mctx->key, mctx->keylen);
+	return 0;
+}
+
+static int digest_update(struct shash_desc *desc, const u8 *data,
+			 unsigned int length)
+{
+	struct blake2b_state *state = shash_desc_ctx(desc);
+
+	blake2b_update(state, data, length);
+	return 0;
+}
+
+static int digest_final(struct shash_desc *desc, u8 *out)
+{
+	struct blake2b_state *state = shash_desc_ctx(desc);
+	const int digestsize = crypto_shash_digestsize(desc->tfm);
+
+	blake2b_final(state, out, digestsize);
+	return 0;
+}
+
+static struct shash_alg blake2b_algs[] = {
+	{
+		.base.cra_name		= "blake2b-160",
+		.base.cra_driver_name	= "blake2b-160-generic",
+		.base.cra_priority	= 100,
+		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+		.base.cra_blocksize	= BLAKE2B_BLOCKBYTES,
+		.base.cra_ctxsize	= sizeof(struct digest_tfm_ctx),
+		.base.cra_module	= THIS_MODULE,
+		.digestsize		= BLAKE2B_160_DIGEST_SIZE,
+		.setkey			= digest_setkey,
+		.init			= digest_init,
+		.update			= digest_update,
+		.final			= digest_final,
+		.descsize		= sizeof(struct blake2b_state),
+	}, {
+		.base.cra_name		= "blake2b-256",
+		.base.cra_driver_name	= "blake2b-256-generic",
+		.base.cra_priority	= 100,
+		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+		.base.cra_blocksize	= BLAKE2B_BLOCKBYTES,
+		.base.cra_ctxsize	= sizeof(struct digest_tfm_ctx),
+		.base.cra_module	= THIS_MODULE,
+		.digestsize		= BLAKE2B_256_DIGEST_SIZE,
+		.setkey			= digest_setkey,
+		.init			= digest_init,
+		.update			= digest_update,
+		.final			= digest_final,
+		.descsize		= sizeof(struct blake2b_state),
+	}, {
+		.base.cra_name		= "blake2b-384",
+		.base.cra_driver_name	= "blake2b-384-generic",
+		.base.cra_priority	= 100,
+		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+		.base.cra_blocksize	= BLAKE2B_BLOCKBYTES,
+		.base.cra_ctxsize	= sizeof(struct digest_tfm_ctx),
+		.base.cra_module	= THIS_MODULE,
+		.digestsize		= BLAKE2B_384_DIGEST_SIZE,
+		.setkey			= digest_setkey,
+		.init			= digest_init,
+		.update			= digest_update,
+		.final			= digest_final,
+		.descsize		= sizeof(struct blake2b_state),
+	}, {
+		.base.cra_name		= "blake2b-512",
+		.base.cra_driver_name	= "blake2b-512-generic",
+		.base.cra_priority	= 100,
+		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,
+		.base.cra_blocksize	= BLAKE2B_BLOCKBYTES,
+		.base.cra_ctxsize	= sizeof(struct digest_tfm_ctx),
+		.base.cra_module	= THIS_MODULE,
+		.digestsize		= BLAKE2B_512_DIGEST_SIZE,
+		.setkey			= digest_setkey,
+		.init			= digest_init,
+		.update			= digest_update,
+		.final			= digest_final,
+		.descsize		= sizeof(struct blake2b_state),
+	}
+};
+
+static int __init blake2b_mod_init(void)
+{
+	BUILD_BUG_ON(sizeof(struct blake2b_param) != BLAKE2B_OUTBYTES);
+
+	return crypto_register_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
+}
+
+static void __exit blake2b_mod_fini(void)
+{
+	crypto_unregister_shashes(blake2b_algs, ARRAY_SIZE(blake2b_algs));
+}
+
+subsys_initcall(blake2b_mod_init);
+module_exit(blake2b_mod_fini);
+
+MODULE_AUTHOR("David Sterba <kdave@kernel.org>");
+MODULE_DESCRIPTION("BLAKE2b generic implementation");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CRYPTO("blake2b-160");
+MODULE_ALIAS_CRYPTO("blake2b-160-generic");
+MODULE_ALIAS_CRYPTO("blake2b-256");
+MODULE_ALIAS_CRYPTO("blake2b-256-generic");
+MODULE_ALIAS_CRYPTO("blake2b-384");
+MODULE_ALIAS_CRYPTO("blake2b-384-generic");
+MODULE_ALIAS_CRYPTO("blake2b-512");
+MODULE_ALIAS_CRYPTO("blake2b-512-generic");