iPXE
ecb.c
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1 /*
2  * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation; either version 2 of the
7  * License, or any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA.
18  *
19  * You can also choose to distribute this program under the terms of
20  * the Unmodified Binary Distribution Licence (as given in the file
21  * COPYING.UBDL), provided that you have satisfied its requirements.
22  */
23 
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25 
26 #include <assert.h>
27 #include <ipxe/crypto.h>
28 #include <ipxe/ecb.h>
29 
30 /** @file
31  *
32  * Electronic codebook (ECB)
33  *
34  */
35 
36 /**
37  * Encrypt data
38  *
39  * @v ctx Context
40  * @v src Data to encrypt
41  * @v dst Buffer for encrypted data
42  * @v len Length of data
43  * @v raw_cipher Underlying cipher algorithm
44  */
45 void ecb_encrypt ( void *ctx, const void *src, void *dst, size_t len,
46  struct cipher_algorithm *raw_cipher ) {
47  size_t blocksize = raw_cipher->blocksize;
48 
49  assert ( ( len % blocksize ) == 0 );
50 
51  while ( len ) {
52  cipher_encrypt ( raw_cipher, ctx, src, dst, blocksize );
53  dst += blocksize;
54  src += blocksize;
55  len -= blocksize;
56  }
57 }
58 
59 /**
60  * Decrypt data
61  *
62  * @v ctx Context
63  * @v src Data to decrypt
64  * @v dst Buffer for decrypted data
65  * @v len Length of data
66  * @v raw_cipher Underlying cipher algorithm
67  */
68 void ecb_decrypt ( void *ctx, const void *src, void *dst, size_t len,
69  struct cipher_algorithm *raw_cipher ) {
70  size_t blocksize = raw_cipher->blocksize;
71 
72  assert ( ( len % blocksize ) == 0 );
73 
74  while ( len ) {
75  cipher_decrypt ( raw_cipher, ctx, src, dst, blocksize );
76  dst += blocksize;
77  src += blocksize;
78  len -= blocksize;
79  }
80 }
size_t blocksize
Block size.
Definition: crypto.h:54
void ecb_decrypt(void *ctx, const void *src, void *dst, size_t len, struct cipher_algorithm *raw_cipher)
Decrypt data.
Definition: ecb.c:68
Cryptographic API.
struct golan_eq_context ctx
Definition: CIB_PRM.h:28
Electronic codebook (ECB)
#define cipher_encrypt(cipher, ctx, src, dst, len)
Definition: crypto.h:202
Assertions.
assert((readw(&hdr->flags) &(GTF_reading|GTF_writing))==0)
static __always_inline void off_t userptr_t src
Definition: efi_uaccess.h:66
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)
#define cipher_decrypt(cipher, ctx, src, dst, len)
Definition: crypto.h:212
uint32_t len
Length.
Definition: ena.h:14
A cipher algorithm.
Definition: crypto.h:48
void ecb_encrypt(void *ctx, const void *src, void *dst, size_t len, struct cipher_algorithm *raw_cipher)
Encrypt data.
Definition: ecb.c:45