Merge drm/drm-next into drm-intel-next
[platform/kernel/linux-starfive.git] / crypto / kdf_sp800108.c
1 // SPDX-License-Identifier: GPL-2.0
2
3 /*
4  * SP800-108 Key-derivation function
5  *
6  * Copyright (C) 2021, Stephan Mueller <smueller@chronox.de>
7  */
8
9 #include <linux/fips.h>
10 #include <linux/module.h>
11 #include <crypto/kdf_sp800108.h>
12 #include <crypto/internal/kdf_selftest.h>
13
14 /*
15  * SP800-108 CTR KDF implementation
16  */
17 int crypto_kdf108_ctr_generate(struct crypto_shash *kmd,
18                                const struct kvec *info, unsigned int info_nvec,
19                                u8 *dst, unsigned int dlen)
20 {
21         SHASH_DESC_ON_STACK(desc, kmd);
22         __be32 counter = cpu_to_be32(1);
23         const unsigned int h = crypto_shash_digestsize(kmd), dlen_orig = dlen;
24         unsigned int i;
25         int err = 0;
26         u8 *dst_orig = dst;
27
28         desc->tfm = kmd;
29
30         while (dlen) {
31                 err = crypto_shash_init(desc);
32                 if (err)
33                         goto out;
34
35                 err = crypto_shash_update(desc, (u8 *)&counter, sizeof(__be32));
36                 if (err)
37                         goto out;
38
39                 for (i = 0; i < info_nvec; i++) {
40                         err = crypto_shash_update(desc, info[i].iov_base,
41                                                   info[i].iov_len);
42                         if (err)
43                                 goto out;
44                 }
45
46                 if (dlen < h) {
47                         u8 tmpbuffer[HASH_MAX_DIGESTSIZE];
48
49                         err = crypto_shash_final(desc, tmpbuffer);
50                         if (err)
51                                 goto out;
52                         memcpy(dst, tmpbuffer, dlen);
53                         memzero_explicit(tmpbuffer, h);
54                         goto out;
55                 }
56
57                 err = crypto_shash_final(desc, dst);
58                 if (err)
59                         goto out;
60
61                 dlen -= h;
62                 dst += h;
63                 counter = cpu_to_be32(be32_to_cpu(counter) + 1);
64         }
65
66 out:
67         if (err)
68                 memzero_explicit(dst_orig, dlen_orig);
69         shash_desc_zero(desc);
70         return err;
71 }
72 EXPORT_SYMBOL(crypto_kdf108_ctr_generate);
73
74 /*
75  * The seeding of the KDF
76  */
77 int crypto_kdf108_setkey(struct crypto_shash *kmd,
78                          const u8 *key, size_t keylen,
79                          const u8 *ikm, size_t ikmlen)
80 {
81         unsigned int ds = crypto_shash_digestsize(kmd);
82
83         /* SP800-108 does not support IKM */
84         if (ikm || ikmlen)
85                 return -EINVAL;
86
87         /* Check according to SP800-108 section 7.2 */
88         if (ds > keylen)
89                 return -EINVAL;
90
91         /* Set the key for the MAC used for the KDF. */
92         return crypto_shash_setkey(kmd, key, keylen);
93 }
94 EXPORT_SYMBOL(crypto_kdf108_setkey);
95
96 /*
97  * Test vector obtained from
98  * http://csrc.nist.gov/groups/STM/cavp/documents/KBKDF800-108/CounterMode.zip
99  */
100 static const struct kdf_testvec kdf_ctr_hmac_sha256_tv_template[] = {
101         {
102                 .key = "\xdd\x1d\x91\xb7\xd9\x0b\x2b\xd3"
103                        "\x13\x85\x33\xce\x92\xb2\x72\xfb"
104                        "\xf8\xa3\x69\x31\x6a\xef\xe2\x42"
105                        "\xe6\x59\xcc\x0a\xe2\x38\xaf\xe0",
106                 .keylen = 32,
107                 .ikm = NULL,
108                 .ikmlen = 0,
109                 .info = {
110                         .iov_base = "\x01\x32\x2b\x96\xb3\x0a\xcd\x19"
111                                     "\x79\x79\x44\x4e\x46\x8e\x1c\x5c"
112                                     "\x68\x59\xbf\x1b\x1c\xf9\x51\xb7"
113                                     "\xe7\x25\x30\x3e\x23\x7e\x46\xb8"
114                                     "\x64\xa1\x45\xfa\xb2\x5e\x51\x7b"
115                                     "\x08\xf8\x68\x3d\x03\x15\xbb\x29"
116                                     "\x11\xd8\x0a\x0e\x8a\xba\x17\xf3"
117                                     "\xb4\x13\xfa\xac",
118                         .iov_len  = 60
119                 },
120                 .expected         = "\x10\x62\x13\x42\xbf\xb0\xfd\x40"
121                                     "\x04\x6c\x0e\x29\xf2\xcf\xdb\xf0",
122                 .expectedlen      = 16
123         }
124 };
125
126 static int __init crypto_kdf108_init(void)
127 {
128         int ret;
129
130         if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
131                 return 0;
132
133         ret = kdf_test(&kdf_ctr_hmac_sha256_tv_template[0], "hmac(sha256)",
134                        crypto_kdf108_setkey, crypto_kdf108_ctr_generate);
135         if (ret) {
136                 if (fips_enabled)
137                         panic("alg: self-tests for CTR-KDF (hmac(sha256)) failed (rc=%d)\n",
138                               ret);
139
140                 WARN(1,
141                      "alg: self-tests for CTR-KDF (hmac(sha256)) failed (rc=%d)\n",
142                      ret);
143         } else if (fips_enabled) {
144                 pr_info("alg: self-tests for CTR-KDF (hmac(sha256)) passed\n");
145         }
146
147         return ret;
148 }
149
150 static void __exit crypto_kdf108_exit(void) { }
151
152 module_init(crypto_kdf108_init);
153 module_exit(crypto_kdf108_exit);
154
155 MODULE_LICENSE("GPL v2");
156 MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>");
157 MODULE_DESCRIPTION("Key Derivation Function conformant to SP800-108");