diff options
| author | Michael Brown <mcb30@ipxe.org> | 2012-03-18 20:02:25 +0000 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2012-03-18 20:22:43 +0000 |
| commit | 3ec773cd2b9d32c5a4bb3a7a6ae86e49fd278c8f (patch) | |
| tree | 743d5b133e4469d9644319fd54f81c06822711c5 /src/include/ipxe/rsa.h | |
| parent | 5af9e6219646ace094cfe35caa0125cbff8f38f8 (diff) | |
| download | ipxe-3ec773cd2b9d32c5a4bb3a7a6ae86e49fd278c8f.tar.gz | |
[crypto] Force caller to provide temporary storage for modular calculations
bigint_mod_multiply() and bigint_mod_exp() require a fixed amount of
temporary storage for intermediate results. (The amount of temporary
storage required depends upon the size of the integers involved.)
When performing calculations for 4096-bit RSA the amount of temporary
storage space required will exceed 2.5kB, which is too much to
allocate on the stack. Avoid this problem by forcing the caller to
allocate temporary storage.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/include/ipxe/rsa.h')
| -rw-r--r-- | src/include/ipxe/rsa.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/include/ipxe/rsa.h b/src/include/ipxe/rsa.h index e70362ce7..87e75a82f 100644 --- a/src/include/ipxe/rsa.h +++ b/src/include/ipxe/rsa.h @@ -129,6 +129,8 @@ struct rsa_context { bigint_element_t *input0; /** Output buffer */ bigint_element_t *output0; + /** Temporary working space for modular exponentiation */ + void *tmp; }; extern struct pubkey_algorithm rsa_algorithm; |