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-rw-r--r--crypto/blake2b_generic.c320
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diff --git a/crypto/blake2b_generic.c b/crypto/blake2b_generic.c
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+// 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_KEYBYTES = 64,
+};
+
+struct blake2b_state {
+ u64 h[8];
+ u64 t[2];
+ u64 f[2];
+ u8 buf[BLAKE2B_BLOCKBYTES];
+ size_t buflen;
+};
+
+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_increment_counter(struct blake2b_state *S, const u64 inc)
+{
+ S->t[0] += inc;
+ S->t[1] += (S->t[0] < inc);
+}
+
+#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
+
+struct blake2b_tfm_ctx {
+ u8 key[BLAKE2B_KEYBYTES];
+ unsigned int keylen;
+};
+
+static int blake2b_setkey(struct crypto_shash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
+
+ if (keylen == 0 || keylen > BLAKE2B_KEYBYTES) {
+ crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+
+ memcpy(tctx->key, key, keylen);
+ tctx->keylen = keylen;
+
+ return 0;
+}
+
+static int blake2b_init(struct shash_desc *desc)
+{
+ struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
+ struct blake2b_state *state = shash_desc_ctx(desc);
+ const int digestsize = crypto_shash_digestsize(desc->tfm);
+
+ memset(state, 0, sizeof(*state));
+ memcpy(state->h, blake2b_IV, sizeof(state->h));
+
+ /* Parameter block is all zeros except index 0, no xor for 1..7 */
+ state->h[0] ^= 0x01010000 | tctx->keylen << 8 | digestsize;
+
+ if (tctx->keylen) {
+ /*
+ * Prefill the buffer with the key, next call to _update or
+ * _final will process it
+ */
+ memcpy(state->buf, tctx->key, tctx->keylen);
+ state->buflen = BLAKE2B_BLOCKBYTES;
+ }
+ return 0;
+}
+
+static int blake2b_update(struct shash_desc *desc, const u8 *in,
+ unsigned int inlen)
+{
+ struct blake2b_state *state = shash_desc_ctx(desc);
+ const size_t left = state->buflen;
+ const size_t fill = BLAKE2B_BLOCKBYTES - left;
+
+ if (!inlen)
+ return 0;
+
+ if (inlen > fill) {
+ state->buflen = 0;
+ /* Fill buffer */
+ memcpy(state->buf + left, in, fill);
+ blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
+ /* Compress */
+ blake2b_compress(state, state->buf);
+ in += fill;
+ inlen -= fill;
+ while (inlen > BLAKE2B_BLOCKBYTES) {
+ blake2b_increment_counter(state, BLAKE2B_BLOCKBYTES);
+ blake2b_compress(state, in);
+ in += BLAKE2B_BLOCKBYTES;
+ inlen -= BLAKE2B_BLOCKBYTES;
+ }
+ }
+ memcpy(state->buf + state->buflen, in, inlen);
+ state->buflen += inlen;
+
+ return 0;
+}
+
+static int blake2b_final(struct shash_desc *desc, u8 *out)
+{
+ struct blake2b_state *state = shash_desc_ctx(desc);
+ const int digestsize = crypto_shash_digestsize(desc->tfm);
+ size_t i;
+
+ blake2b_increment_counter(state, state->buflen);
+ /* Set last block */
+ state->f[0] = (u64)-1;
+ /* Padding */
+ memset(state->buf + state->buflen, 0, BLAKE2B_BLOCKBYTES - state->buflen);
+ blake2b_compress(state, state->buf);
+
+ /* Avoid temporary buffer and switch the internal output to LE order */
+ for (i = 0; i < ARRAY_SIZE(state->h); i++)
+ __cpu_to_le64s(&state->h[i]);
+
+ memcpy(out, state->h, 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 blake2b_tfm_ctx),
+ .base.cra_module = THIS_MODULE,
+ .digestsize = BLAKE2B_160_DIGEST_SIZE,
+ .setkey = blake2b_setkey,
+ .init = blake2b_init,
+ .update = blake2b_update,
+ .final = blake2b_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 blake2b_tfm_ctx),
+ .base.cra_module = THIS_MODULE,
+ .digestsize = BLAKE2B_256_DIGEST_SIZE,
+ .setkey = blake2b_setkey,
+ .init = blake2b_init,
+ .update = blake2b_update,
+ .final = blake2b_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 blake2b_tfm_ctx),
+ .base.cra_module = THIS_MODULE,
+ .digestsize = BLAKE2B_384_DIGEST_SIZE,
+ .setkey = blake2b_setkey,
+ .init = blake2b_init,
+ .update = blake2b_update,
+ .final = blake2b_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 blake2b_tfm_ctx),
+ .base.cra_module = THIS_MODULE,
+ .digestsize = BLAKE2B_512_DIGEST_SIZE,
+ .setkey = blake2b_setkey,
+ .init = blake2b_init,
+ .update = blake2b_update,
+ .final = blake2b_final,
+ .descsize = sizeof(struct blake2b_state),
+ }
+};
+
+static int __init blake2b_mod_init(void)
+{
+ 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");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.