diff options
Diffstat (limited to 'src/block/xtea_sse2/xtea_sse2.cpp')
-rw-r--r-- | src/block/xtea_sse2/xtea_sse2.cpp | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/block/xtea_sse2/xtea_sse2.cpp b/src/block/xtea_sse2/xtea_sse2.cpp new file mode 100644 index 000000000..5d9c7dd05 --- /dev/null +++ b/src/block/xtea_sse2/xtea_sse2.cpp @@ -0,0 +1,124 @@ +/* +* XTEA in SIMD +* (C) 2009 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/xtea_sse2.h> +#include <botan/loadstor.h> +#include <botan/simd_32.h> + +namespace Botan { + +namespace { + +void xtea_encrypt_8(const byte in[64], byte out[64], const u32bit EK[64]) + { + SIMD_32 L0 = SIMD_32::load_be(in ); + SIMD_32 R0 = SIMD_32::load_be(in + 16); + SIMD_32 L1 = SIMD_32::load_be(in + 32); + SIMD_32 R1 = SIMD_32::load_be(in + 48); + + SIMD_32::transpose(L0, R0, L1, R1); + + for(u32bit i = 0; i != 32; i += 2) + { + SIMD_32 K0(EK[2*i ]); + SIMD_32 K1(EK[2*i+1]); + SIMD_32 K2(EK[2*i+2]); + SIMD_32 K3(EK[2*i+3]); + + L0 += (((R0 << 4) ^ (R0 >> 5)) + R0) ^ K0; + L1 += (((R1 << 4) ^ (R1 >> 5)) + R1) ^ K0; + + R0 += (((L0 << 4) ^ (L0 >> 5)) + L0) ^ K1; + R1 += (((L1 << 4) ^ (L1 >> 5)) + L1) ^ K1; + + L0 += (((R0 << 4) ^ (R0 >> 5)) + R0) ^ K2; + L1 += (((R1 << 4) ^ (R1 >> 5)) + R1) ^ K2; + + R0 += (((L0 << 4) ^ (L0 >> 5)) + L0) ^ K3; + R1 += (((L1 << 4) ^ (L1 >> 5)) + L1) ^ K3; + } + + SIMD_32::transpose(L0, R0, L1, R1); + + L0.store_be(out); + R0.store_be(out + 16); + L1.store_be(out + 32); + R1.store_be(out + 48); + } + +void xtea_decrypt_8(const byte in[64], byte out[64], const u32bit EK[64]) + { + SIMD_32 L0 = SIMD_32::load_be(in ); + SIMD_32 R0 = SIMD_32::load_be(in + 16); + SIMD_32 L1 = SIMD_32::load_be(in + 32); + SIMD_32 R1 = SIMD_32::load_be(in + 48); + + SIMD_32::transpose(L0, R0, L1, R1); + + for(u32bit i = 0; i != 32; i += 2) + { + SIMD_32 K0(EK[63 - 2*i]); + SIMD_32 K1(EK[62 - 2*i]); + SIMD_32 K2(EK[61 - 2*i]); + SIMD_32 K3(EK[60 - 2*i]); + + R0 -= (((L0 << 4) ^ (L0 >> 5)) + L0) ^ K0; + R1 -= (((L1 << 4) ^ (L1 >> 5)) + L1) ^ K0; + + L0 -= (((R0 << 4) ^ (R0 >> 5)) + R0) ^ K1; + L1 -= (((R1 << 4) ^ (R1 >> 5)) + R1) ^ K1; + + R0 -= (((L0 << 4) ^ (L0 >> 5)) + L0) ^ K2; + R1 -= (((L1 << 4) ^ (L1 >> 5)) + L1) ^ K2; + + L0 -= (((R0 << 4) ^ (R0 >> 5)) + R0) ^ K3; + L1 -= (((R1 << 4) ^ (R1 >> 5)) + R1) ^ K3; + } + + SIMD_32::transpose(L0, R0, L1, R1); + + L0.store_be(out); + R0.store_be(out + 16); + L1.store_be(out + 32); + R1.store_be(out + 48); + } + +} + +/* +* XTEA Encryption +*/ +void XTEA_SSE2::encrypt_n(const byte in[], byte out[], u32bit blocks) const + { + while(blocks >= 8) + { + xtea_encrypt_8(in, out, this->EK); + in += 8 * BLOCK_SIZE; + out += 8 * BLOCK_SIZE; + blocks -= 8; + } + + XTEA::encrypt_n(in, out, blocks); + } + +/* +* XTEA Decryption +*/ +void XTEA_SSE2::decrypt_n(const byte in[], byte out[], u32bit blocks) const + { + while(blocks >= 8) + { + xtea_decrypt_8(in, out, this->EK); + in += 8 * BLOCK_SIZE; + out += 8 * BLOCK_SIZE; + blocks -= 8; + } + + XTEA::decrypt_n(in, out, blocks); + } + +} |