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-rw-r--r--lib/block/tea/info.txt1
-rw-r--r--lib/block/tea/tea.cpp78
-rw-r--r--lib/block/tea/tea.h34
3 files changed, 113 insertions, 0 deletions
diff --git a/lib/block/tea/info.txt b/lib/block/tea/info.txt
new file mode 100644
index 000000000..14edfdb03
--- /dev/null
+++ b/lib/block/tea/info.txt
@@ -0,0 +1 @@
+define TEA 20131128
diff --git a/lib/block/tea/tea.cpp b/lib/block/tea/tea.cpp
new file mode 100644
index 000000000..2accab700
--- /dev/null
+++ b/lib/block/tea/tea.cpp
@@ -0,0 +1,78 @@
+/*
+* TEA
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/tea.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+/*
+* TEA Encryption
+*/
+void TEA::encrypt_n(const byte in[], byte out[], size_t blocks) const
+ {
+ for(size_t i = 0; i != blocks; ++i)
+ {
+ u32bit L = load_be<u32bit>(in, 0);
+ u32bit R = load_be<u32bit>(in, 1);
+
+ u32bit S = 0;
+ for(size_t j = 0; j != 32; ++j)
+ {
+ S += 0x9E3779B9;
+ L += ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]);
+ R += ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]);
+ }
+
+ store_be(out, L, R);
+
+ in += BLOCK_SIZE;
+ out += BLOCK_SIZE;
+ }
+ }
+
+/*
+* TEA Decryption
+*/
+void TEA::decrypt_n(const byte in[], byte out[], size_t blocks) const
+ {
+ for(size_t i = 0; i != blocks; ++i)
+ {
+ u32bit L = load_be<u32bit>(in, 0);
+ u32bit R = load_be<u32bit>(in, 1);
+
+ u32bit S = 0xC6EF3720;
+ for(size_t j = 0; j != 32; ++j)
+ {
+ R -= ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]);
+ L -= ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]);
+ S -= 0x9E3779B9;
+ }
+
+ store_be(out, L, R);
+
+ in += BLOCK_SIZE;
+ out += BLOCK_SIZE;
+ }
+ }
+
+/*
+* TEA Key Schedule
+*/
+void TEA::key_schedule(const byte key[], size_t)
+ {
+ K.resize(4);
+ for(size_t i = 0; i != 4; ++i)
+ K[i] = load_be<u32bit>(key, i);
+ }
+
+void TEA::clear()
+ {
+ zap(K);
+ }
+
+}
diff --git a/lib/block/tea/tea.h b/lib/block/tea/tea.h
new file mode 100644
index 000000000..0d203975e
--- /dev/null
+++ b/lib/block/tea/tea.h
@@ -0,0 +1,34 @@
+/*
+* TEA
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_TEA_H__
+#define BOTAN_TEA_H__
+
+#include <botan/block_cipher.h>
+
+namespace Botan {
+
+/**
+* TEA
+*/
+class BOTAN_DLL TEA : public Block_Cipher_Fixed_Params<8, 16>
+ {
+ public:
+ void encrypt_n(const byte in[], byte out[], size_t blocks) const;
+ void decrypt_n(const byte in[], byte out[], size_t blocks) const;
+
+ void clear();
+ std::string name() const { return "TEA"; }
+ BlockCipher* clone() const { return new TEA; }
+ private:
+ void key_schedule(const byte[], size_t);
+ secure_vector<u32bit> K;
+ };
+
+}
+
+#endif