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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* Kerberos 5 crypto
3 *
4 * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells ([email protected])
6 */
7
8#ifndef _CRYPTO_KRB5_H
9#define _CRYPTO_KRB5_H
10
11#include <linux/crypto.h>
12#include <crypto/aead.h>
13#include <crypto/hash.h>
14
15struct crypto_shash;
16struct scatterlist;
17
18/*
19 * Per Kerberos v5 protocol spec crypto types from the wire. These get mapped
20 * to linux kernel crypto routines.
21 */
22#define KRB5_ENCTYPE_NULL 0x0000
23#define KRB5_ENCTYPE_DES_CBC_CRC 0x0001 /* DES cbc mode with CRC-32 */
24#define KRB5_ENCTYPE_DES_CBC_MD4 0x0002 /* DES cbc mode with RSA-MD4 */
25#define KRB5_ENCTYPE_DES_CBC_MD5 0x0003 /* DES cbc mode with RSA-MD5 */
26#define KRB5_ENCTYPE_DES_CBC_RAW 0x0004 /* DES cbc mode raw */
27/* XXX deprecated? */
28#define KRB5_ENCTYPE_DES3_CBC_SHA 0x0005 /* DES-3 cbc mode with NIST-SHA */
29#define KRB5_ENCTYPE_DES3_CBC_RAW 0x0006 /* DES-3 cbc mode raw */
30#define KRB5_ENCTYPE_DES_HMAC_SHA1 0x0008
31#define KRB5_ENCTYPE_DES3_CBC_SHA1 0x0010
32#define KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011
33#define KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012
34#define KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128 0x0013
35#define KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192 0x0014
36#define KRB5_ENCTYPE_ARCFOUR_HMAC 0x0017
37#define KRB5_ENCTYPE_ARCFOUR_HMAC_EXP 0x0018
38#define KRB5_ENCTYPE_CAMELLIA128_CTS_CMAC 0x0019
39#define KRB5_ENCTYPE_CAMELLIA256_CTS_CMAC 0x001a
40#define KRB5_ENCTYPE_UNKNOWN 0x01ff
41
42#define KRB5_CKSUMTYPE_CRC32 0x0001
43#define KRB5_CKSUMTYPE_RSA_MD4 0x0002
44#define KRB5_CKSUMTYPE_RSA_MD4_DES 0x0003
45#define KRB5_CKSUMTYPE_DESCBC 0x0004
46#define KRB5_CKSUMTYPE_RSA_MD5 0x0007
47#define KRB5_CKSUMTYPE_RSA_MD5_DES 0x0008
48#define KRB5_CKSUMTYPE_NIST_SHA 0x0009
49#define KRB5_CKSUMTYPE_HMAC_SHA1_DES3 0x000c
50#define KRB5_CKSUMTYPE_HMAC_SHA1_96_AES128 0x000f
51#define KRB5_CKSUMTYPE_HMAC_SHA1_96_AES256 0x0010
52#define KRB5_CKSUMTYPE_CMAC_CAMELLIA128 0x0011
53#define KRB5_CKSUMTYPE_CMAC_CAMELLIA256 0x0012
54#define KRB5_CKSUMTYPE_HMAC_SHA256_128_AES128 0x0013
55#define KRB5_CKSUMTYPE_HMAC_SHA384_192_AES256 0x0014
56#define KRB5_CKSUMTYPE_HMAC_MD5_ARCFOUR -138 /* Microsoft md5 hmac cksumtype */
57
58/*
59 * Constants used for key derivation
60 */
61/* from rfc3961 */
62#define KEY_USAGE_SEED_CHECKSUM (0x99)
63#define KEY_USAGE_SEED_ENCRYPTION (0xAA)
64#define KEY_USAGE_SEED_INTEGRITY (0x55)
65
66/*
67 * Standard Kerberos error codes.
68 */
69#define KRB5_PROG_KEYTYPE_NOSUPP -1765328233
70
71/*
72 * Mode of operation.
73 */
74enum krb5_crypto_mode {
75 KRB5_CHECKSUM_MODE, /* Checksum only */
76 KRB5_ENCRYPT_MODE, /* Fully encrypted, possibly with integrity checksum */
77};
78
79struct krb5_buffer {
80 unsigned int len;
81 void *data;
82};
83
84/*
85 * Kerberos encoding type definition.
86 */
87struct krb5_enctype {
88 int etype; /* Encryption (key) type */
89 int ctype; /* Checksum type */
90 const char *name; /* "Friendly" name */
91 const char *encrypt_name; /* Crypto encrypt+checksum name */
92 const char *cksum_name; /* Crypto checksum name */
93 const char *hash_name; /* Crypto hash name */
94 const char *derivation_enc; /* Cipher used in key derivation */
95 u16 block_len; /* Length of encryption block */
96 u16 conf_len; /* Length of confounder (normally == block_len) */
97 u16 cksum_len; /* Length of checksum */
98 u16 key_bytes; /* Length of raw key, in bytes */
99 u16 key_len; /* Length of final key, in bytes */
100 u16 hash_len; /* Length of hash in bytes */
101 u16 prf_len; /* Length of PRF() result in bytes */
102 u16 Kc_len; /* Length of Kc in bytes */
103 u16 Ke_len; /* Length of Ke in bytes */
104 u16 Ki_len; /* Length of Ki in bytes */
105 bool keyed_cksum; /* T if a keyed cksum */
106
107 const struct krb5_crypto_profile *profile;
108
109 int (*random_to_key)(const struct krb5_enctype *krb5,
110 const struct krb5_buffer *in,
111 struct krb5_buffer *out); /* complete key generation */
112};
113
114/*
115 * krb5_api.c
116 */
117const struct krb5_enctype *crypto_krb5_find_enctype(u32 enctype);
118size_t crypto_krb5_how_much_buffer(const struct krb5_enctype *krb5,
119 enum krb5_crypto_mode mode,
120 size_t data_size, size_t *_offset);
121size_t crypto_krb5_how_much_data(const struct krb5_enctype *krb5,
122 enum krb5_crypto_mode mode,
123 size_t *_buffer_size, size_t *_offset);
124int crypto_krb5_where_is_the_data(const struct krb5_enctype *krb5,
125 enum krb5_crypto_mode mode,
126 size_t *_offset, size_t *_len);
127int crypto_krb5_check_data_len(const struct krb5_enctype *krb5,
128 enum krb5_crypto_mode mode,
129 size_t len, size_t min_content);
130struct crypto_aead *crypto_krb5_prepare_encryption(const struct krb5_enctype *krb5,
131 const struct krb5_buffer *TK,
132 u32 usage, gfp_t gfp);
133struct crypto_shash *crypto_krb5_prepare_checksum(const struct krb5_enctype *krb5,
134 const struct krb5_buffer *TK,
135 u32 usage, gfp_t gfp);
136ssize_t crypto_krb5_encrypt(const struct krb5_enctype *krb5,
137 struct crypto_aead *aead,
138 struct scatterlist *sg, unsigned int nr_sg,
139 size_t sg_len,
140 size_t data_offset, size_t data_len,
141 bool preconfounded);
142int crypto_krb5_decrypt(const struct krb5_enctype *krb5,
143 struct crypto_aead *aead,
144 struct scatterlist *sg, unsigned int nr_sg,
145 size_t *_offset, size_t *_len);
146ssize_t crypto_krb5_get_mic(const struct krb5_enctype *krb5,
147 struct crypto_shash *shash,
148 const struct krb5_buffer *metadata,
149 struct scatterlist *sg, unsigned int nr_sg,
150 size_t sg_len,
151 size_t data_offset, size_t data_len);
152int crypto_krb5_verify_mic(const struct krb5_enctype *krb5,
153 struct crypto_shash *shash,
154 const struct krb5_buffer *metadata,
155 struct scatterlist *sg, unsigned int nr_sg,
156 size_t *_offset, size_t *_len);
157
158/*
159 * krb5_kdf.c
160 */
161int crypto_krb5_calc_PRFplus(const struct krb5_enctype *krb5,
162 const struct krb5_buffer *K,
163 unsigned int L,
164 const struct krb5_buffer *S,
165 struct krb5_buffer *result,
166 gfp_t gfp);
167
168#endif /* _CRYPTO_KRB5_H */