Skip to content
GitLab
Projects
Groups
Snippets
Help
Loading...
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
N
nettle
Project overview
Project overview
Details
Activity
Releases
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Labels
Merge Requests
5
Merge Requests
5
Analytics
Analytics
Repository
Value Stream
Wiki
Wiki
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Commits
Open sidebar
Nettle
nettle
Commits
cfc88891
Commit
cfc88891
authored
Apr 30, 2014
by
Niels Möller
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
New macros related to ccm nonce size.
parent
b9451863
Changes
3
Hide whitespace changes
Inline
Side-by-side
Showing
3 changed files
with
22 additions
and
5 deletions
+22
-5
ChangeLog
ChangeLog
+10
-0
ccm.c
ccm.c
+2
-5
ccm.h
ccm.h
+10
-0
No files found.
ChangeLog
View file @
cfc88891
2014-04-30 Niels Möller <nisse@lysator.liu.se>
* ccm.c (CCM_IV_MAX_SIZE, CCM_IV_MIN_SIZE): Deleted, replaced by
public constants CCM_MIN_NONCE_SIZE and CCM_MAX_NONCE_SIZE.
(ccm_build_iv): Updated for above rename.
(CCM_L_MAX_SIZE): Deleted, no longer used.
* ccm.h (CCM_MIN_NONCE_SIZE, CCM_MAX_NONCE_SIZE): New constants.
(CCM_MAX_MSG_SIZE): New macro.
2014-04-27 Niels Möller <nisse@lysator.liu.se>
* nettle.texinfo (Cipher modes): Subsection on AEAD constructions.
...
...
ccm.c
View file @
cfc88891
...
...
@@ -68,9 +68,6 @@
#define CCM_OFFSET_FLAGS 0
#define CCM_OFFSET_NONCE 1
#define CCM_L_SIZE(_nlen_) (CCM_BLOCK_SIZE - CCM_OFFSET_NONCE - (_nlen_))
#define CCM_L_MAX_SIZE (CCM_FLAG_L+1)
#define CCM_IV_MAX_SIZE (CCM_BLOCK_SIZE - CCM_OFFSET_NONCE - 1)
#define CCM_IV_MIN_SIZE (CCM_BLOCK_SIZE - CCM_OFFSET_NONCE - CCM_L_MAX_SIZE)
/*
* The data input to the CBC-MAC: L(a) | adata | padding | plaintext | padding
...
...
@@ -104,8 +101,8 @@ ccm_build_iv(uint8_t *iv, size_t noncelen, const uint8_t *nonce,
unsigned
int
i
;
/* Sanity check the nonce length. */
assert
(
noncelen
>=
CCM_
IV_MIN
_SIZE
);
assert
(
noncelen
<=
CCM_
IV_MAX
_SIZE
);
assert
(
noncelen
>=
CCM_
MIN_NONCE
_SIZE
);
assert
(
noncelen
<=
CCM_
MAX_NONCE
_SIZE
);
/* Generate the IV */
iv
[
CCM_OFFSET_FLAGS
]
=
flags
|
CCM_FLAG_SET_L
(
CCM_L_SIZE
(
noncelen
));
...
...
ccm.h
View file @
cfc88891
...
...
@@ -89,6 +89,16 @@ extern "C" {
/* For CCM, the block size of the block cipher shall be 128 bits. */
#define CCM_BLOCK_SIZE 16
#define CCM_MIN_NONCE_SIZE 7
#define CCM_MAX_NONCE_SIZE 14
/* Maximum cleartext message size, as a function of the nonce size N.
The length field is L octets, with L = 15 - N, and then the maximum
size M = 2^{8L} - 1. */
#define CCM_MAX_MSG_SIZE(N) \
((sizeof(size_t) + (N) <= 15) \
? ~(size_t) 0 \
: ((size_t) 1 << (8*(15 - N))) - 1)
/* Per-message state */
struct
ccm_ctx
{
...
...
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
.
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment