From b087dfab4d3902681550fd1f5ff9c3e942059478 Mon Sep 17 00:00:00 2001 From: Patrick Steuer Date: Thu, 4 Nov 2021 15:58:51 +0100 Subject: s390/crypto: add SIMD implementation for ChaCha20 Add an implementation of the ChaCha20 stream cipher (see e.g. RFC 7539) that makes use of z13's vector instruction set extension. The original implementation is by Andy Polyakov which is adapted for kernel use. Four to six blocks are processed in parallel resulting in a performance gain for inputs >= 256 bytes. chacha20-generic 1 operation in 622 cycles (256 bytes) 1 operation in 2346 cycles (1024 bytes) chacha20-s390 1 operation in 218 cycles (256 bytes) 1 operation in 647 cycles (1024 bytes) Cc: Andy Polyakov Reviewed-by: Harald Freudenberger Signed-off-by: Patrick Steuer Signed-off-by: Heiko Carstens --- arch/s390/configs/defconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/s390/configs/defconfig') diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig index 0056cab27372..03ab6081b15d 100644 --- a/arch/s390/configs/defconfig +++ b/arch/s390/configs/defconfig @@ -755,6 +755,7 @@ CONFIG_CRYPTO_SHA3_256_S390=m CONFIG_CRYPTO_SHA3_512_S390=m CONFIG_CRYPTO_DES_S390=m CONFIG_CRYPTO_AES_S390=m +CONFIG_CRYPTO_CHACHA_S390=m CONFIG_CRYPTO_GHASH_S390=m CONFIG_CRYPTO_CRC32_S390=y CONFIG_CRYPTO_DEV_VIRTIO=m -- cgit v1.2.3