aboutsummaryrefslogtreecommitdiff
path: root/crypto/chacha20_generic.c
diff options
context:
space:
mode:
authorEric Biggers <ebiggers@google.com>2017-11-22 11:51:39 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2017-11-29 17:33:33 +1100
commit9f480faec58cd6197a007ea1dcac6b7c3daf1139 (patch)
treebd5107e627a9013bbbfc290ceccea218d9393f66 /crypto/chacha20_generic.c
parent796c99fbd7e20a8d78189fc0166a524d78f635a0 (diff)
downloadlinux-stericsson-9f480faec58cd6197a007ea1dcac6b7c3daf1139.tar.gz
crypto: chacha20 - Fix keystream alignment for chacha20_block()
When chacha20_block() outputs the keystream block, it uses 'u32' stores directly. However, the callers (crypto/chacha20_generic.c and drivers/char/random.c) declare the keystream buffer as a 'u8' array, which is not guaranteed to have the needed alignment. Fix it by having both callers declare the keystream as a 'u32' array. For now this is preferable to switching over to the unaligned access macros because chacha20_block() is only being used in cases where we can easily control the alignment (stack buffers). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/chacha20_generic.c')
-rw-r--r--crypto/chacha20_generic.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/crypto/chacha20_generic.c b/crypto/chacha20_generic.c
index bb4affbd591c..e451c3cb6a56 100644
--- a/crypto/chacha20_generic.c
+++ b/crypto/chacha20_generic.c
@@ -18,20 +18,20 @@
static void chacha20_docrypt(u32 *state, u8 *dst, const u8 *src,
unsigned int bytes)
{
- u8 stream[CHACHA20_BLOCK_SIZE];
+ u32 stream[CHACHA20_BLOCK_WORDS];
if (dst != src)
memcpy(dst, src, bytes);
while (bytes >= CHACHA20_BLOCK_SIZE) {
chacha20_block(state, stream);
- crypto_xor(dst, stream, CHACHA20_BLOCK_SIZE);
+ crypto_xor(dst, (const u8 *)stream, CHACHA20_BLOCK_SIZE);
bytes -= CHACHA20_BLOCK_SIZE;
dst += CHACHA20_BLOCK_SIZE;
}
if (bytes) {
chacha20_block(state, stream);
- crypto_xor(dst, stream, bytes);
+ crypto_xor(dst, (const u8 *)stream, bytes);
}
}