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crypto: x86/salsa20 - cleanup and convert to skcipher API

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Convert salsa20-asm from the deprecated "blkcipher" API to the
"skcipher" API, in the process fixing it up to use the generic helpers.
This allows removing the salsa20_keysetup() and salsa20_ivsetup()
assembly functions, which aren't performance critical; the C versions do
just fine.

This also fixes the same bug that salsa20-generic had, where the state
array was being maintained directly in the transform context rather than
on the stack or in the request context.  Thus, if multiple threads used
the same Salsa20 transform concurrently they produced the wrong results.

Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Eric Biggers 2018-01-05 11:09:59 -08:00 • committed by Herbert Xu
commit c9a3ff8f22
4 changed files with 46 additions and 359 deletions
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2
crypto/Kconfig
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@ -1339,6 +1339,7 @@ config CRYPTO_SALSA20_586
tristate "Salsa20 stream cipher algorithm (i586)"
depends on (X86 || UML_X86) && !64BIT
select CRYPTO_BLKCIPHER
select CRYPTO_SALSA20
help
Salsa20 stream cipher algorithm.
@ -1352,6 +1353,7 @@ config CRYPTO_SALSA20_X86_64
tristate "Salsa20 stream cipher algorithm (x86_64)"
depends on (X86 || UML_X86) && 64BIT
select CRYPTO_BLKCIPHER
select CRYPTO_SALSA20
help
Salsa20 stream cipher algorithm.