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rsa: Verify RSA padding programatically

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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>
This commit is contained in:
Andrew Duda
2016-11-08 18:53:40 +00:00
committed by Tom Rini
parent 5300a4f933
commit da29f2991d
9 changed files with 61 additions and 131 deletions
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4
include/u-boot/rsa-checksum.h
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@@ -12,10 +12,6 @@
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
extern const uint8_t padding_sha256_rsa4096[];
extern const uint8_t padding_sha256_rsa2048[];
extern const uint8_t padding_sha1_rsa2048[];
/**
* hash_calculate() - Calculate hash over the data
*