1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Public Key Signature Algorithm
*
* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
*/
#ifndef _CRYPTO_SIG_H
#define _CRYPTO_SIG_H
#include <linux/crypto.h>
/**
* struct crypto_sig - user-instantiated objects which encapsulate
* algorithms and core processing logic
*
* @base: Common crypto API algorithm data structure
*/
struct crypto_sig {
struct crypto_tfm base;
};
/**
* DOC: Generic Public Key Signature API
*
* The Public Key Signature API is used with the algorithms of type
* CRYPTO_ALG_TYPE_SIG (listed as type "sig" in /proc/crypto)
*/
/**
* crypto_alloc_sig() - allocate signature tfm handle
* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
* signing algorithm e.g. "ecdsa"
* @type: specifies the type of the algorithm
* @mask: specifies the mask for the algorithm
*
* Allocate a handle for public key signature algorithm. The returned struct
* crypto_sig is the handle that is required for any subsequent
* API invocation for signature operations.
*
* Return: allocated handle in case of success; IS_ERR() is true in case
* of an error, PTR_ERR() returns the error code.
*/
struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask);
static inline struct crypto_tfm *crypto_sig_tfm(struct crypto_sig *tfm)
{
return &tfm->base;
}
/**
* crypto_free_sig() - free signature tfm handle
*
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
*
* If @tfm is a NULL or error pointer, this function does nothing.
*/
static inline void crypto_free_sig(struct crypto_sig *tfm)
{
crypto_destroy_tfm(tfm, crypto_sig_tfm(tfm));
}
/**
* crypto_sig_maxsize() - Get len for output buffer
*
* Function returns the dest buffer size required for a given key.
* Function assumes that the key is already set in the transformation. If this
* function is called without a setkey or with a failed setkey, you will end up
* in a NULL dereference.
*
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
*/
int crypto_sig_maxsize(struct crypto_sig *tfm);
/**
* crypto_sig_sign() - Invoke signing operation
*
* Function invokes the specific signing operation for a given algorithm
*
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
* @src: source buffer
* @slen: source length
* @dst: destinatino obuffer
* @dlen: destination length
*
* Return: zero on success; error code in case of error
*/
int crypto_sig_sign(struct crypto_sig *tfm,
const void *src, unsigned int slen,
void *dst, unsigned int dlen);
/**
* crypto_sig_verify() - Invoke signature verification
*
* Function invokes the specific signature verification operation
* for a given algorithm.
*
* @tfm: signature tfm handle allocated with crypto_alloc_sig()
* @src: source buffer
* @slen: source length
* @digest: digest
* @dlen: digest length
*
* Return: zero on verification success; error code in case of error.
*/
int crypto_sig_verify(struct crypto_sig *tfm,
const void *src, unsigned int slen,
const void *digest, unsigned int dlen);
/**
* crypto_sig_set_pubkey() - Invoke set public key operation
*
* Function invokes the algorithm specific set key function, which knows
* how to decode and interpret the encoded key and parameters
*
* @tfm: tfm handle
* @key: BER encoded public key, algo OID, paramlen, BER encoded
* parameters
* @keylen: length of the key (not including other data)
*
* Return: zero on success; error code in case of error
*/
int crypto_sig_set_pubkey(struct crypto_sig *tfm,
const void *key, unsigned int keylen);
/**
* crypto_sig_set_privkey() - Invoke set private key operation
*
* Function invokes the algorithm specific set key function, which knows
* how to decode and interpret the encoded key and parameters
*
* @tfm: tfm handle
* @key: BER encoded private key, algo OID, paramlen, BER encoded
* parameters
* @keylen: length of the key (not including other data)
*
* Return: zero on success; error code in case of error
*/
int crypto_sig_set_privkey(struct crypto_sig *tfm,
const void *key, unsigned int keylen);
#endif
|
