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authorlloyd <[email protected]>2014-01-10 03:41:59 +0000
committerlloyd <[email protected]>2014-01-10 03:41:59 +0000
commit6894dca64c04936d07048c0e8cbf7e25858548c3 (patch)
tree5d572bfde9fe667dab14e3f04b5285a85d8acd95 /src/lib/block/lion/lion.cpp
parent9efa3be92442afb3d0b69890a36c7f122df18eda (diff)
Move lib into src
Diffstat (limited to 'src/lib/block/lion/lion.cpp')
-rw-r--r--src/lib/block/lion/lion.cpp129
1 files changed, 129 insertions, 0 deletions
diff --git a/src/lib/block/lion/lion.cpp b/src/lib/block/lion/lion.cpp
new file mode 100644
index 000000000..e1e0b56c6
--- /dev/null
+++ b/src/lib/block/lion/lion.cpp
@@ -0,0 +1,129 @@
+/*
+* Lion
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/lion.h>
+#include <botan/internal/xor_buf.h>
+#include <botan/parsing.h>
+
+namespace Botan {
+
+/*
+* Lion Encryption
+*/
+void Lion::encrypt_n(const byte in[], byte out[], size_t blocks) const
+ {
+ secure_vector<byte> buffer_vec(LEFT_SIZE);
+ byte* buffer = &buffer_vec[0];
+
+ for(size_t i = 0; i != blocks; ++i)
+ {
+ xor_buf(buffer, in, &key1[0], LEFT_SIZE);
+ cipher->set_key(buffer, LEFT_SIZE);
+ cipher->cipher(in + LEFT_SIZE, out + LEFT_SIZE, RIGHT_SIZE);
+
+ hash->update(out + LEFT_SIZE, RIGHT_SIZE);
+ hash->final(buffer);
+ xor_buf(out, in, buffer, LEFT_SIZE);
+
+ xor_buf(buffer, out, &key2[0], LEFT_SIZE);
+ cipher->set_key(buffer, LEFT_SIZE);
+ cipher->cipher1(out + LEFT_SIZE, RIGHT_SIZE);
+
+ in += BLOCK_SIZE;
+ out += BLOCK_SIZE;
+ }
+ }
+
+/*
+* Lion Decryption
+*/
+void Lion::decrypt_n(const byte in[], byte out[], size_t blocks) const
+ {
+ secure_vector<byte> buffer_vec(LEFT_SIZE);
+ byte* buffer = &buffer_vec[0];
+
+ for(size_t i = 0; i != blocks; ++i)
+ {
+ xor_buf(buffer, in, &key2[0], LEFT_SIZE);
+ cipher->set_key(buffer, LEFT_SIZE);
+ cipher->cipher(in + LEFT_SIZE, out + LEFT_SIZE, RIGHT_SIZE);
+
+ hash->update(out + LEFT_SIZE, RIGHT_SIZE);
+ hash->final(buffer);
+ xor_buf(out, in, buffer, LEFT_SIZE);
+
+ xor_buf(buffer, out, &key1[0], LEFT_SIZE);
+ cipher->set_key(buffer, LEFT_SIZE);
+ cipher->cipher1(out + LEFT_SIZE, RIGHT_SIZE);
+
+ in += BLOCK_SIZE;
+ out += BLOCK_SIZE;
+ }
+ }
+
+/*
+* Lion Key Schedule
+*/
+void Lion::key_schedule(const byte key[], size_t length)
+ {
+ clear();
+
+ const size_t half = length / 2;
+ copy_mem(&key1[0], key, half);
+ copy_mem(&key2[0], key + half, half);
+ }
+
+/*
+* Return the name of this type
+*/
+std::string Lion::name() const
+ {
+ return "Lion(" + hash->name() + "," +
+ cipher->name() + "," +
+ std::to_string(BLOCK_SIZE) + ")";
+ }
+
+/*
+* Return a clone of this object
+*/
+BlockCipher* Lion::clone() const
+ {
+ return new Lion(hash->clone(), cipher->clone(), BLOCK_SIZE);
+ }
+
+/*
+* Clear memory of sensitive data
+*/
+void Lion::clear()
+ {
+ zeroise(key1);
+ zeroise(key2);
+ hash->clear();
+ cipher->clear();
+ }
+
+/*
+* Lion Constructor
+*/
+Lion::Lion(HashFunction* hash_in, StreamCipher* sc_in, size_t block_len) :
+ BLOCK_SIZE(std::max<size_t>(2*hash_in->output_length() + 1, block_len)),
+ LEFT_SIZE(hash_in->output_length()),
+ RIGHT_SIZE(BLOCK_SIZE - LEFT_SIZE),
+ hash(hash_in),
+ cipher(sc_in)
+ {
+ if(2*LEFT_SIZE + 1 > BLOCK_SIZE)
+ throw Invalid_Argument(name() + ": Chosen block size is too small");
+
+ if(!cipher->valid_keylength(LEFT_SIZE))
+ throw Invalid_Argument(name() + ": This stream/hash combo is invalid");
+
+ key1.resize(LEFT_SIZE);
+ key2.resize(LEFT_SIZE);
+ }
+
+}