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crypto: algif_aead - copy AAD from src to dst

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Use the NULL cipher to copy the AAD and PT/CT from the TX SGL
to the RX SGL. This allows an in-place crypto operation on the
RX SGL for encryption, because the TX data is always smaller or
equal to the RX data (the RX data will hold the tag).

For decryption, a per-request TX SGL is created which will only hold
the tag value. As the RX SGL will have no space for the tag value and
an in-place operation will not write the tag buffer, the TX SGL with the
tag value is chained to the RX SGL. This now allows an in-place
crypto operation.

For example:

* without the patch:
kcapi -x 2 -e -c "gcm(aes)" -p 89154d0d4129d322e4487bafaa4f6b46 -k c0ece3e63198af382b5603331cc23fa8 -i 7e489b83622e7228314d878d -a afcd7202d621e06ca53b70c2bdff7fb2 -l 16 -u -s
00000000000000000000000000000000f4a3eacfbdadd3b1a17117b1d67ffc1f1e21efbbc6d83724a8c296e3bb8cda0c

* with the patch:
kcapi -x 2 -e -c "gcm(aes)" -p 89154d0d4129d322e4487bafaa4f6b46 -k c0ece3e63198af382b5603331cc23fa8 -i 7e489b83622e7228314d878d -a afcd7202d621e06ca53b70c2bdff7fb2 -l 16 -u -s
afcd7202d621e06ca53b70c2bdff7fb2f4a3eacfbdadd3b1a17117b1d67ffc1f1e21efbbc6d83724a8c296e3bb8cda0c

Tests covering this functionality have been added to libkcapi.

Signed-off-by: Stephan Mueller <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Stephan Mueller 2017-07-30 14:32:58 +02:00 • committed by Herbert Xu
commit 72548b093e
2 changed files with 162 additions and 23 deletions
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2
crypto/Kconfig
View file

@ -1753,6 +1753,8 @@ config CRYPTO_USER_API_AEAD
tristate "User-space interface for AEAD cipher algorithms"
depends on NET
select CRYPTO_AEAD
select CRYPTO_BLKCIPHER
select CRYPTO_NULL
select CRYPTO_USER_API
help
This option enables the user-spaces interface for AEAD