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-rw-r--r--src/block/twofish/twofish.cpp158
1 files changed, 85 insertions, 73 deletions
diff --git a/src/block/twofish/twofish.cpp b/src/block/twofish/twofish.cpp
index 9784b00a2..3136837aa 100644
--- a/src/block/twofish/twofish.cpp
+++ b/src/block/twofish/twofish.cpp
@@ -14,91 +14,103 @@ namespace Botan {
/*
* Twofish Encryption
*/
-void Twofish::enc(const byte in[], byte out[]) const
+void Twofish::encrypt_n(const byte in[], byte out[], u32bit blocks) const
{
- u32bit A = load_le<u32bit>(in, 0) ^ round_key[0];
- u32bit B = load_le<u32bit>(in, 1) ^ round_key[1];
- u32bit C = load_le<u32bit>(in, 2) ^ round_key[2];
- u32bit D = load_le<u32bit>(in, 3) ^ round_key[3];
-
- for(u32bit j = 0; j != 16; j += 2)
+ for(u32bit i = 0; i != blocks; ++i)
{
- u32bit X, Y;
-
- X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^
- SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)];
- Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^
- SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)];
- X += Y;
- Y += X + round_key[2*j + 9];
- X += round_key[2*j + 8];
-
- C = rotate_right(C ^ X, 1);
- D = rotate_left(D, 1) ^ Y;
-
- X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^
- SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)];
- Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^
- SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)];
- X += Y;
- Y += X + round_key[2*j + 11];
- X += round_key[2*j + 10];
-
- A = rotate_right(A ^ X, 1);
- B = rotate_left(B, 1) ^ Y;
- }
+ u32bit A = load_le<u32bit>(in, 0) ^ round_key[0];
+ u32bit B = load_le<u32bit>(in, 1) ^ round_key[1];
+ u32bit C = load_le<u32bit>(in, 2) ^ round_key[2];
+ u32bit D = load_le<u32bit>(in, 3) ^ round_key[3];
- C ^= round_key[4];
- D ^= round_key[5];
- A ^= round_key[6];
- B ^= round_key[7];
+ for(u32bit j = 0; j != 16; j += 2)
+ {
+ u32bit X, Y;
+
+ X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^
+ SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)];
+ Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^
+ SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)];
+ X += Y;
+ Y += X + round_key[2*j + 9];
+ X += round_key[2*j + 8];
+
+ C = rotate_right(C ^ X, 1);
+ D = rotate_left(D, 1) ^ Y;
+
+ X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^
+ SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)];
+ Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^
+ SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)];
+ X += Y;
+ Y += X + round_key[2*j + 11];
+ X += round_key[2*j + 10];
+
+ A = rotate_right(A ^ X, 1);
+ B = rotate_left(B, 1) ^ Y;
+ }
- store_le(out, C, D, A, B);
+ C ^= round_key[4];
+ D ^= round_key[5];
+ A ^= round_key[6];
+ B ^= round_key[7];
+
+ store_le(out, C, D, A, B);
+
+ in += BLOCK_SIZE;
+ out += BLOCK_SIZE;
+ }
}
/*
* Twofish Decryption
*/
-void Twofish::dec(const byte in[], byte out[]) const
+void Twofish::decrypt_n(const byte in[], byte out[], u32bit blocks) const
{
- u32bit A = load_le<u32bit>(in, 0) ^ round_key[4];
- u32bit B = load_le<u32bit>(in, 1) ^ round_key[5];
- u32bit C = load_le<u32bit>(in, 2) ^ round_key[6];
- u32bit D = load_le<u32bit>(in, 3) ^ round_key[7];
-
- for(u32bit j = 0; j != 16; j += 2)
+ for(u32bit i = 0; i != blocks; ++i)
{
- u32bit X, Y;
-
- X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^
- SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)];
- Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^
- SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)];
- X += Y;
- Y += X + round_key[39 - 2*j];
- X += round_key[38 - 2*j];
-
- C = rotate_left(C, 1) ^ X;
- D = rotate_right(D ^ Y, 1);
-
- X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^
- SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)];
- Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^
- SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)];
- X += Y;
- Y += X + round_key[37 - 2*j];
- X += round_key[36 - 2*j];
-
- A = rotate_left(A, 1) ^ X;
- B = rotate_right(B ^ Y, 1);
- }
+ u32bit A = load_le<u32bit>(in, 0) ^ round_key[4];
+ u32bit B = load_le<u32bit>(in, 1) ^ round_key[5];
+ u32bit C = load_le<u32bit>(in, 2) ^ round_key[6];
+ u32bit D = load_le<u32bit>(in, 3) ^ round_key[7];
- C ^= round_key[0];
- D ^= round_key[1];
- A ^= round_key[2];
- B ^= round_key[3];
+ for(u32bit j = 0; j != 16; j += 2)
+ {
+ u32bit X, Y;
+
+ X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^
+ SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)];
+ Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^
+ SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)];
+ X += Y;
+ Y += X + round_key[39 - 2*j];
+ X += round_key[38 - 2*j];
+
+ C = rotate_left(C, 1) ^ X;
+ D = rotate_right(D ^ Y, 1);
+
+ X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^
+ SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)];
+ Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^
+ SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)];
+ X += Y;
+ Y += X + round_key[37 - 2*j];
+ X += round_key[36 - 2*j];
+
+ A = rotate_left(A, 1) ^ X;
+ B = rotate_right(B ^ Y, 1);
+ }
- store_le(out, C, D, A, B);
+ C ^= round_key[0];
+ D ^= round_key[1];
+ A ^= round_key[2];
+ B ^= round_key[3];
+
+ store_le(out, C, D, A, B);
+
+ in += BLOCK_SIZE;
+ out += BLOCK_SIZE;
+ }
}
/*
@@ -206,7 +218,7 @@ void Twofish::rs_mul(byte S[4], byte key, u32bit offset)
/*
* Clear memory of sensitive data
*/
-void Twofish::clear() throw()
+void Twofish::clear()
{
SBox0.clear();
SBox1.clear();
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 23:31:18 +0000