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crypto: x86/poly1305 - Clear key material from stack in SSE2 variant

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1-block SSE2 variant of poly1305 stores variables s1..s4 containing key
material on the stack. This commit adds missing zeroing of the stack
memory. Benchmarks show negligible performance hit (tested on i7-3770).

Signed-off-by: Tommi Hirvola <tommi@hirvola.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tommi Hirvola 2019-02-19 17:45:54 +02:00 • committed by Herbert Xu
parent 307244452d
commit 7748168c66
1 changed files with 4 additions and 0 deletions
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4
arch/x86/crypto/poly1305-sse2-x86_64.S
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@ -272,6 +272,10 @@ ENTRY(poly1305_block_sse2)
dec %rcx
jnz .Ldoblock
# Zeroing of key material
mov %rcx,0x00(%rsp)
mov %rcx,0x08(%rsp)
add $0x10,%rsp
pop %r12
pop %rbx