| 1 | |
| 2 | |
| 3 | * Crypto API support for BLAKE2b
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| 4 | *
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| 5 | * Copyright 2025 Google LLC
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| 6 |
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| 7 | #include <crypto/blake2b.h>
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| 8 | #include <crypto/internal/hash.h>
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| 9 | #include <linux/kernel.h>
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| 10 | #include <linux/module.h>
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| 11 |
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| 12 | struct blake2b_tfm_ctx {
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| 13 | unsigned int keylen;
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| 14 | u8 key[BLAKE2B_KEY_SIZE];
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| 15 | };
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| 16 |
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| 17 | static int crypto_blake2b_setkey(struct crypto_shash *tfm,
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| 18 | const u8 *key, unsigned int keylen)
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| 19 | {
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| 20 | struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
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| 21 |
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| 22 | if (keylen > BLAKE2B_KEY_SIZE)
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| 23 | return -EINVAL;
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| 24 | memcpy(tctx->key, key, keylen);
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| 25 | tctx->keylen = keylen;
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| 26 | return 0;
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| 27 | }
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| 28 |
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| 29 | #define BLAKE2B_CTX(desc) ((struct blake2b_ctx *)shash_desc_ctx(desc))
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| 30 |
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| 31 | static int crypto_blake2b_init(struct shash_desc *desc)
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| 32 | {
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| 33 | const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
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| 34 | unsigned int digestsize = crypto_shash_digestsize(desc->tfm);
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| 35 |
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| 36 | blake2b_init_key(BLAKE2B_CTX(desc), digestsize,
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| 37 | tctx->key, tctx->keylen);
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| 38 | return 0;
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| 39 | }
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| 40 |
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| 41 | static int crypto_blake2b_update(struct shash_desc *desc,
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| 42 | const u8 *data, unsigned int len)
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| 43 | {
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| 44 | blake2b_update(BLAKE2B_CTX(desc), data, len);
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| 45 | return 0;
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| 46 | }
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| 47 |
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| 48 | static int crypto_blake2b_final(struct shash_desc *desc, u8 *out)
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| 49 | {
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| 50 | blake2b_final(BLAKE2B_CTX(desc), out);
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| 51 | return 0;
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| 52 | }
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| 53 |
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| 54 | static int crypto_blake2b_digest(struct shash_desc *desc,
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| 55 | const u8 *data, unsigned int len, u8 *out)
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| 56 | {
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| 57 | const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
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| 58 | unsigned int digestsize = crypto_shash_digestsize(desc->tfm);
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| 59 |
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| 60 | blake2b(tctx->key, tctx->keylen, data, len, out, digestsize);
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| 61 | return 0;
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| 62 | }
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| 63 |
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| 64 | #define BLAKE2B_ALG(name, digest_size) \
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| 65 | { \
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| 66 | .base.cra_name = name, \
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| 67 | .base.cra_driver_name = name "-lib", \
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| 68 | .base.cra_priority = 300, \
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| 69 | .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, \
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| 70 | .base.cra_blocksize = BLAKE2B_BLOCK_SIZE, \
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| 71 | .base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \
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| 72 | .base.cra_module = THIS_MODULE, \
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| 73 | .digestsize = digest_size, \
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| 74 | .setkey = crypto_blake2b_setkey, \
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| 75 | .init = crypto_blake2b_init, \
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| 76 | .update = crypto_blake2b_update, \
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| 77 | .final = crypto_blake2b_final, \
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| 78 | .digest = crypto_blake2b_digest, \
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| 79 | .descsize = sizeof(struct blake2b_ctx), \
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| 80 | }
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| 81 |
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| 82 | static struct shash_alg algs[] = {
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| 83 | BLAKE2B_ALG("blake2b-160", BLAKE2B_160_HASH_SIZE),
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| 84 | BLAKE2B_ALG("blake2b-256", BLAKE2B_256_HASH_SIZE),
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| 85 | BLAKE2B_ALG("blake2b-384", BLAKE2B_384_HASH_SIZE),
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| 86 | BLAKE2B_ALG("blake2b-512", BLAKE2B_512_HASH_SIZE),
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| 87 | };
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| 88 |
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| 89 | static int __init crypto_blake2b_mod_init(void)
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| 90 | {
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| 91 | return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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| 92 | }
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| 93 | module_init(crypto_blake2b_mod_init);
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| 94 |
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| 95 | static void __exit crypto_blake2b_mod_exit(void)
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| 96 | {
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| 97 | crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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| 98 | }
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| 99 | module_exit(crypto_blake2b_mod_exit);
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| 100 |
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| 101 | MODULE_LICENSE("GPL");
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| 102 | MODULE_DESCRIPTION("Crypto API support for BLAKE2b");
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| 103 |
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| 104 | MODULE_ALIAS_CRYPTO("blake2b-160");
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| 105 | MODULE_ALIAS_CRYPTO("blake2b-160-lib");
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| 106 | MODULE_ALIAS_CRYPTO("blake2b-256");
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| 107 | MODULE_ALIAS_CRYPTO("blake2b-256-lib");
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| 108 | MODULE_ALIAS_CRYPTO("blake2b-384");
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| 109 | MODULE_ALIAS_CRYPTO("blake2b-384-lib");
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| 110 | MODULE_ALIAS_CRYPTO("blake2b-512");
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| 111 | MODULE_ALIAS_CRYPTO("blake2b-512-lib");
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