iPXE
cbc.h
Go to the documentation of this file.
1 #ifndef _IPXE_CBC_H
2 #define _IPXE_CBC_H
3 
4 /** @file
5  *
6  * Cipher-block chaining
7  *
8  */
9 
10 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
11 
12 #include <ipxe/crypto.h>
13 
14 /**
15  * Set key
16  *
17  * @v ctx Context
18  * @v key Key
19  * @v keylen Key length
20  * @v raw_cipher Underlying cipher algorithm
21  * @v cbc_ctx CBC context
22  * @ret rc Return status code
23  */
24 static inline int cbc_setkey ( void *ctx, const void *key, size_t keylen,
25  struct cipher_algorithm *raw_cipher,
26  void *cbc_ctx __unused ) {
27 
28  return cipher_setkey ( raw_cipher, ctx, key, keylen );
29 }
30 
31 /**
32  * Set initialisation vector
33  *
34  * @v ctx Context
35  * @v iv Initialisation vector
36  * @v raw_cipher Underlying cipher algorithm
37  * @v cbc_ctx CBC context
38  */
39 static inline void cbc_setiv ( void *ctx __unused, const void *iv,
40  struct cipher_algorithm *raw_cipher,
41  void *cbc_ctx ) {
42  memcpy ( cbc_ctx, iv, raw_cipher->blocksize );
43 }
44 
45 extern void cbc_encrypt ( void *ctx, const void *src, void *dst,
46  size_t len, struct cipher_algorithm *raw_cipher,
47  void *cbc_ctx );
48 extern void cbc_decrypt ( void *ctx, const void *src, void *dst,
49  size_t len, struct cipher_algorithm *raw_cipher,
50  void *cbc_ctx );
51 
52 /**
53  * Create a cipher-block chaining mode of behaviour of an existing cipher
54  *
55  * @v _cbc_name Name for the new CBC cipher
56  * @v _cbc_cipher New cipher algorithm
57  * @v _raw_cipher Underlying cipher algorithm
58  * @v _raw_context Context structure for the underlying cipher
59  * @v _blocksize Cipher block size
60  */
61 #define CBC_CIPHER( _cbc_name, _cbc_cipher, _raw_cipher, _raw_context, \
62  _blocksize ) \
63 struct _cbc_name ## _context { \
64  _raw_context raw_ctx; \
65  uint8_t cbc_ctx[_blocksize]; \
66 }; \
67 static int _cbc_name ## _setkey ( void *ctx, const void *key, \
68  size_t keylen ) { \
69  struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
70  return cbc_setkey ( &_cbc_name ## _ctx->raw_ctx, key, keylen, \
71  &_raw_cipher, &_cbc_name ## _ctx->cbc_ctx );\
72 } \
73 static void _cbc_name ## _setiv ( void *ctx, const void *iv ) { \
74  struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
75  cbc_setiv ( &_cbc_name ## _ctx->raw_ctx, iv, \
76  &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
77 } \
78 static void _cbc_name ## _encrypt ( void *ctx, const void *src, \
79  void *dst, size_t len ) { \
80  struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
81  cbc_encrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
82  &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
83 } \
84 static void _cbc_name ## _decrypt ( void *ctx, const void *src, \
85  void *dst, size_t len ) { \
86  struct _cbc_name ## _context * _cbc_name ## _ctx = ctx; \
87  cbc_decrypt ( &_cbc_name ## _ctx->raw_ctx, src, dst, len, \
88  &_raw_cipher, &aes_cbc_ctx->cbc_ctx ); \
89 } \
90 struct cipher_algorithm _cbc_cipher = { \
91  .name = #_cbc_name, \
92  .ctxsize = sizeof ( struct _cbc_name ## _context ), \
93  .blocksize = _blocksize, \
94  .setkey = _cbc_name ## _setkey, \
95  .setiv = _cbc_name ## _setiv, \
96  .encrypt = _cbc_name ## _encrypt, \
97  .decrypt = _cbc_name ## _decrypt, \
98 };
99 
100 #endif /* _IPXE_CBC_H */
size_t blocksize
Block size.
Definition: crypto.h:54
void cbc_encrypt(void *ctx, const void *src, void *dst, size_t len, struct cipher_algorithm *raw_cipher, void *cbc_ctx)
Encrypt data.
Definition: cbc.c:66
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)
Cryptographic API.
struct golan_eq_context ctx
Definition: CIB_PRM.h:28
u8 iv[16]
Initialization vector.
Definition: wpa.h:60
void * memcpy(void *dest, const void *src, size_t len) __nonnull
static __always_inline void off_t userptr_t src
Definition: efi_uaccess.h:66
#define __unused
Declare a variable or data structure as unused.
Definition: compiler.h:573
uint32_t len
Length.
Definition: ena.h:14
static void cbc_setiv(void *ctx __unused, const void *iv, struct cipher_algorithm *raw_cipher, void *cbc_ctx)
Set initialisation vector.
Definition: cbc.h:39
A cipher algorithm.
Definition: crypto.h:48
void cbc_decrypt(void *ctx, const void *src, void *dst, size_t len, struct cipher_algorithm *raw_cipher, void *cbc_ctx)
Decrypt data.
Definition: cbc.c:92
static int cbc_setkey(void *ctx, const void *key, size_t keylen, struct cipher_algorithm *raw_cipher, void *cbc_ctx __unused)
Set key.
Definition: cbc.h:24
union @375 key
Sense key.
Definition: scsi.h:18
static int cipher_setkey(struct cipher_algorithm *cipher, void *ctx, const void *key, size_t keylen)
Definition: crypto.h:187