From f51841ba5237952dda3e76df643d3ae13bed3df5 Mon Sep 17 00:00:00 2001 From: lloyd Date: Tue, 11 Aug 2009 02:31:17 +0000 Subject: Change the BlockCipher interface to support multi-block encryption and decryption. Currently only used for counter mode. Doesn't offer much advantage as-is (though might help slightly, in terms of cache effects), but allows for SIMD implementations to process multiple blocks in parallel when possible. Particularly thinking here of Serpent; TEA/XTEA also seem promising in this sense, as is Threefish once that is implemented as a standalone block cipher. --- src/block/serpent_ia32/serp_ia32.cpp | 18 ++++++++++++++---- src/block/serpent_ia32/serp_ia32.h | 4 ++-- 2 files changed, 16 insertions(+), 6 deletions(-) (limited to 'src/block/serpent_ia32') diff --git a/src/block/serpent_ia32/serp_ia32.cpp b/src/block/serpent_ia32/serp_ia32.cpp index 37dd4e637..997bec2fc 100644 --- a/src/block/serpent_ia32/serp_ia32.cpp +++ b/src/block/serpent_ia32/serp_ia32.cpp @@ -21,17 +21,27 @@ void botan_serpent_ia32_key_schedule(u32bit[140]); /* * Serpent Encryption */ -void Serpent_IA32::enc(const byte in[], byte out[]) const +void Serpent_IA32::encrypt_n(const byte in[], byte out[], u32bit blocks) const { - botan_serpent_ia32_encrypt(in, out, round_key); + for(u32bit i = 0; i != blocks; ++i) + { + botan_serpent_ia32_encrypt(in, out, round_key); + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* * Serpent Decryption */ -void Serpent_IA32::dec(const byte in[], byte out[]) const +void Serpent_IA32::decrypt_n(const byte in[], byte out[], u32bit blocks) const { - botan_serpent_ia32_decrypt(in, out, round_key); + for(u32bit i = 0; i != blocks; ++i) + { + botan_serpent_ia32_decrypt(in, out, round_key); + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* diff --git a/src/block/serpent_ia32/serp_ia32.h b/src/block/serpent_ia32/serp_ia32.h index 565e9889d..2b4a95d3d 100644 --- a/src/block/serpent_ia32/serp_ia32.h +++ b/src/block/serpent_ia32/serp_ia32.h @@ -20,8 +20,8 @@ class BOTAN_DLL Serpent_IA32 : public Serpent public: BlockCipher* clone() const { return new Serpent_IA32; } private: - void enc(const byte[], byte[]) const; - void dec(const byte[], byte[]) const; + void encrypt_n(const byte in[], byte out[], u32bit blocks) const; + void decrypt_n(const byte in[], byte out[], u32bit blocks) const; void key_schedule(const byte[], u32bit); }; -- cgit v1.2.3