Prepare to handle partial blocks between scatter/gather calls. For the last partial block, we only want to calculate the aadhash in GCM_COMPLETE, and a new partial block macro will handle both aadhash update and encrypting partial blocks between calls. Signed-off-by: Dave Watson <davejwatson@xxxxxx> --- arch/x86/crypto/aesni-intel_asm.S | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S index aa82493..37b1cee 100644 --- a/arch/x86/crypto/aesni-intel_asm.S +++ b/arch/x86/crypto/aesni-intel_asm.S @@ -345,7 +345,6 @@ _zero_cipher_left_\@: pxor %xmm0, %xmm8 .endif - GHASH_MUL %xmm8, %xmm13, %xmm9, %xmm10, %xmm11, %xmm5, %xmm6 movdqu %xmm8, AadHash(%arg2) .ifc \operation, enc # GHASH computation for the last <16 byte block @@ -378,6 +377,15 @@ _multiple_of_16_bytes_\@: .macro GCM_COMPLETE movdqu AadHash(%arg2), %xmm8 movdqu HashKey(%rsp), %xmm13 + + mov PBlockLen(%arg2), %r12 + + cmp $0, %r12 + je _partial_done\@ + + GHASH_MUL %xmm8, %xmm13, %xmm9, %xmm10, %xmm11, %xmm5, %xmm6 + +_partial_done\@: mov AadLen(%arg2), %r12 # %r13 = aadLen (number of bytes) shl $3, %r12 # convert into number of bits movd %r12d, %xmm15 # len(A) in %xmm15 -- 2.9.5
