diff options
| author | Andrew Duda <aduda@meraki.com> | 2016-11-08 18:53:40 +0000 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-11-21 14:07:30 -0500 |
| commit | da29f2991d75fc8aa3289407a0e686a4a22f8c9e (patch) | |
| tree | 3c972878a859196e72be31fe6da6d0ae5047d38b /include/image.h | |
| parent | 5300a4f9336291fb713fcfaf9ea6e51b71824800 (diff) | |
rsa: Verify RSA padding programatically
Padding verification was done against static SHA/RSA pair arrays which
take up a lot of static memory, are mostly 0xff, and cannot be reused
for additional SHA/RSA pairings. The padding can be easily computed
according to PKCS#1v2.1 as:
EM = 0x00 || 0x01 || PS || 0x00 || T
where PS is (emLen - tLen - 3) octets of 0xff and T is DER encoding
of the hash.
Store DER prefix in checksum_algo and create rsa_verify_padding
function to handle verification of a message for any SHA/RSA pairing.
Signed-off-by: Andrew Duda <aduda@meraki.com>
Signed-off-by: aduda <aduda@meraki.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/image.h')
| -rw-r--r-- | include/image.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/image.h b/include/image.h index bfe10a0190..de73a071d9 100644 --- a/include/image.h +++ b/include/image.h @@ -1070,6 +1070,8 @@ struct image_region { struct checksum_algo { const char *name; const int checksum_len; + const int der_len; + const uint8_t *der_prefix; const int key_len; #if IMAGE_ENABLE_SIGN const EVP_MD *(*calculate_sign)(void); @@ -1077,7 +1079,6 @@ struct checksum_algo { int (*calculate)(const char *name, const struct image_region region[], int region_count, uint8_t *checksum); - const uint8_t *rsa_padding; }; struct image_sig_algo { |