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3 Commits (cff857461be443339aa39d614635d9a4eae8f8b2)

Author SHA1 Message Date
Michael Brown 4acded7e57 [crypto] Support in-place decryption for GCM ciphers 
The hash calculation is currently performed incorrectly when
decrypting in place, since the ciphertext will have been overwritten
with the plaintext before being used to update the hash value.

Restructure the code to allow for in-place encryption and decryption.
Choose to optimise for the decryption case, since we are likely to
decrypt much more data than we encrypt.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 2022-11-10 09:58:37 +00:00
Michael Brown 63577207ab [crypto] Ensure relevant GCM cipher state is cleared by cipher_setiv() 
Reset the accumulated authentication state when cipher_setiv() is
called, to allow the cipher to be reused without resetting the key.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 2022-11-09 16:48:50 +00:00
Michael Brown 8fce26730c [crypto] Add block cipher Galois/Counter mode of operation 
Signed-off-by: Michael Brown <mcb30@ipxe.org>
 2022-10-25 13:21:30 +01:00