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Add support for SHA384 and SHA512

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The current recommendation for best security practice from the US government
is to use SHA384 for TOP SECRET [1].

This patch adds support for SHA384 and SHA512 in the hash command, and also
allows FIT images to be hashed with these algorithms, and signed with
sha384,rsaXXXX and sha512,rsaXXXX

The SHA implementation is adapted from the linux kernel implementation.

[1] Commercial National Security Algorithm Suite
http://www.iad.gov/iad/programs/iad-initiatives/cnsa-suite.cfm

Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>
This commit is contained in:
Reuben Dowle
2020-04-16 17:36:52 +12:00
committed by Tom Rini
parent f191f3a102
commit d16b38f427
13 changed files with 632 additions and 16 deletions
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26
Kconfig
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@@ -358,12 +358,26 @@ config FIT_ENABLE_SHA256_SUPPORT
help
Enable this to support SHA256 checksum of FIT image contents. A
SHA256 checksum is a 256-bit (32-byte) hash value used to check that
the image contents have not been corrupted. SHA256 is recommended
for use in secure applications since (as at 2016) there is no known
feasible attack that could produce a 'collision' with differing
input data. Use this for the highest security. Note that only the
SHA256 variant is supported: SHA512 and others are not currently
supported in U-Boot.
the image contents have not been corrupted.
config FIT_ENABLE_SHA384_SUPPORT
bool "Support SHA384 checksum of FIT image contents"
default n
select SHA384
help
Enable this to support SHA384 checksum of FIT image contents. A
SHA384 checksum is a 384-bit (48-byte) hash value used to check that
the image contents have not been corrupted. Use this for the highest
security.
config FIT_ENABLE_SHA512_SUPPORT
bool "Support SHA512 checksum of FIT image contents"
default n
select SHA512
help
Enable this to support SHA512 checksum of FIT image contents. A
SHA512 checksum is a 512-bit (64-byte) hash value used to check that
the image contents have not been corrupted.
config FIT_SIGNATURE
bool "Enable signature verification of FIT uImages"