aboutsummaryrefslogtreecommitdiffstats
path: root/lib
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-01 00:38:39 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-01 00:38:39 (GMT)
commitd4c90396ed7ef9b4e4d221e008e54be8bea8307f (patch)
tree5611f1f27eec16edfeb6a3fd73a8ef7dbfd037b4 /lib
parentf36fc04e4cdda9e4c72ee504e7dc638f9a168863 (diff)
parentbf433416e67597ba105ece55b3136557874945db (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto updates from Herbert Xu: "Here is the crypto update for 4.3: API: - the AEAD interface transition is now complete. - add top-level skcipher interface. Drivers: - x86-64 acceleration for chacha20/poly1305. - add sunxi-ss Allwinner Security System crypto accelerator. - add RSA algorithm to qat driver. - add SRIOV support to qat driver. - add LS1021A support to caam. - add i.MX6 support to caam" * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (163 commits) crypto: algif_aead - fix for multiple operations on AF_ALG sockets crypto: qat - enable legacy VFs MPI: Fix mpi_read_buffer crypto: qat - silence a static checker warning crypto: vmx - Fixing opcode issue crypto: caam - Use the preferred style for memory allocations crypto: caam - Propagate the real error code in caam_probe crypto: caam - Fix the error handling in caam_probe crypto: caam - fix writing to JQCR_MS when using service interface crypto: hash - Add AHASH_REQUEST_ON_STACK crypto: testmgr - Use new skcipher interface crypto: skcipher - Add top-level skcipher interface crypto: cmac - allow usage in FIPS mode crypto: sahara - Use dmam_alloc_coherent crypto: caam - Add support for LS1021A crypto: qat - Don't move data inside output buffer crypto: vmx - Fixing GHASH Key issue on little endian crypto: vmx - Fixing AES-CTR counter bug crypto: null - Add missing Kconfig tristate for NULL2 crypto: nx - Add forward declaration for struct crypto_aead ...
Diffstat (limited to 'lib')
-rw-r--r--lib/mpi/mpicoder.c38
1 files changed, 25 insertions, 13 deletions
diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c
index bc0a1da..95c52a9 100644
--- a/lib/mpi/mpicoder.c
+++ b/lib/mpi/mpicoder.c
@@ -146,18 +146,25 @@ int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
uint8_t *p;
mpi_limb_t alimb;
unsigned int n = mpi_get_size(a);
- int i;
+ int i, lzeros = 0;
- if (buf_len < n || !buf)
+ if (buf_len < n || !buf || !nbytes)
return -EINVAL;
if (sign)
*sign = a->sign;
- if (nbytes)
- *nbytes = n;
+ p = (void *)&a->d[a->nlimbs] - 1;
+
+ for (i = a->nlimbs * sizeof(alimb) - 1; i >= 0; i--, p--) {
+ if (!*p)
+ lzeros++;
+ else
+ break;
+ }
p = buf;
+ *nbytes = n - lzeros;
for (i = a->nlimbs - 1; i >= 0; i--) {
alimb = a->d[i];
@@ -178,6 +185,19 @@ int mpi_read_buffer(MPI a, uint8_t *buf, unsigned buf_len, unsigned *nbytes,
#else
#error please implement for this limb size.
#endif
+
+ if (lzeros > 0) {
+ if (lzeros >= sizeof(alimb)) {
+ p -= sizeof(alimb);
+ } else {
+ mpi_limb_t *limb1 = (void *)p - sizeof(alimb);
+ mpi_limb_t *limb2 = (void *)p - sizeof(alimb)
+ + lzeros;
+ *limb1 = *limb2;
+ p -= lzeros;
+ }
+ lzeros -= sizeof(alimb);
+ }
}
return 0;
}
@@ -197,7 +217,7 @@ EXPORT_SYMBOL_GPL(mpi_read_buffer);
*/
void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign)
{
- uint8_t *buf, *p;
+ uint8_t *buf;
unsigned int n;
int ret;
@@ -220,14 +240,6 @@ void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign)
kfree(buf);
return NULL;
}
-
- /* this is sub-optimal but we need to do the shift operation
- * because the caller has to free the returned buffer */
- for (p = buf; !*p && *nbytes; p++, --*nbytes)
- ;
- if (p != buf)
- memmove(buf, p, *nbytes);
-
return buf;
}
EXPORT_SYMBOL_GPL(mpi_get_buffer);

Privacy Policy