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authorlloyd <[email protected]>2008-09-28 19:29:24 +0000
committerlloyd <[email protected]>2008-09-28 19:29:24 +0000
commit9bcfe627321ddc81691b835dffaa6324ac4684a4 (patch)
treefe5e8ae9813b853549558b59833022e87e83981b /src/rng/x931_rng
parent9822a701516396b7de4e41339faecd48ff8dc8ff (diff)
Move all modules into src/ directory
Diffstat (limited to 'src/rng/x931_rng')
-rw-r--r--src/rng/x931_rng/modinfo.txt14
-rw-r--r--src/rng/x931_rng/x931_rng.cpp142
-rw-r--r--src/rng/x931_rng/x931_rng.h42
3 files changed, 198 insertions, 0 deletions
diff --git a/src/rng/x931_rng/modinfo.txt b/src/rng/x931_rng/modinfo.txt
new file mode 100644
index 000000000..79e436822
--- /dev/null
+++ b/src/rng/x931_rng/modinfo.txt
@@ -0,0 +1,14 @@
+realname "ANSI X9.31 PRNG"
+
+define X931_RNG
+
+load_on auto
+
+<add>
+x931_rng.cpp
+x931_rng.h
+</add>
+
+<requires>
+randpool
+</requires>
diff --git a/src/rng/x931_rng/x931_rng.cpp b/src/rng/x931_rng/x931_rng.cpp
new file mode 100644
index 000000000..f4b0f71a9
--- /dev/null
+++ b/src/rng/x931_rng/x931_rng.cpp
@@ -0,0 +1,142 @@
+/*************************************************
+* ANSI X9.31 RNG Source File *
+* (C) 1999-2008 Jack Lloyd *
+*************************************************/
+
+#include <botan/x931_rng.h>
+#include <botan/lookup.h>
+#include <botan/xor_buf.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*************************************************
+* Generate a buffer of random bytes *
+*************************************************/
+void ANSI_X931_RNG::randomize(byte out[], u32bit length)
+ {
+ if(!is_seeded())
+ reseed();
+
+ while(length)
+ {
+ if(position == R.size())
+ update_buffer();
+
+ const u32bit copied = std::min(length, R.size() - position);
+
+ copy_mem(out, R + position, copied);
+ out += copied;
+ length -= copied;
+ position += copied;
+ }
+ }
+
+/*************************************************
+* Refill the internal state *
+*************************************************/
+void ANSI_X931_RNG::update_buffer()
+ {
+ SecureVector<byte> DT(cipher->BLOCK_SIZE);
+
+ prng->randomize(DT, DT.size());
+ cipher->encrypt(DT);
+
+ xor_buf(R, V, DT, cipher->BLOCK_SIZE);
+ cipher->encrypt(R);
+
+ xor_buf(V, R, DT, cipher->BLOCK_SIZE);
+ cipher->encrypt(V);
+
+ position = 0;
+ }
+
+/*************************************************
+* Reseed the internal state *
+*************************************************/
+void ANSI_X931_RNG::reseed()
+ {
+ prng->reseed();
+
+ SecureVector<byte> key(cipher->MAXIMUM_KEYLENGTH);
+ prng->randomize(key, key.size());
+ cipher->set_key(key, key.size());
+
+ if(V.size() != cipher->BLOCK_SIZE)
+ V.create(cipher->BLOCK_SIZE);
+ prng->randomize(V, V.size());
+
+ update_buffer();
+ }
+
+/*************************************************
+* Add a entropy source to the underlying PRNG *
+*************************************************/
+void ANSI_X931_RNG::add_entropy_source(EntropySource* src)
+ {
+ prng->add_entropy_source(src);
+ }
+
+/*************************************************
+* Add some entropy to the underlying PRNG *
+*************************************************/
+void ANSI_X931_RNG::add_entropy(const byte input[], u32bit length)
+ {
+ prng->add_entropy(input, length);
+ }
+
+/*************************************************
+* Check if the the PRNG is seeded *
+*************************************************/
+bool ANSI_X931_RNG::is_seeded() const
+ {
+ return V.has_items();
+ }
+
+/*************************************************
+* Clear memory of sensitive data *
+*************************************************/
+void ANSI_X931_RNG::clear() throw()
+ {
+ cipher->clear();
+ prng->clear();
+ R.clear();
+ V.destroy();
+
+ position = 0;
+ }
+
+/*************************************************
+* Return the name of this type *
+*************************************************/
+std::string ANSI_X931_RNG::name() const
+ {
+ return "X9.31(" + cipher->name() + ")";
+ }
+
+/*************************************************
+* ANSI X931 RNG Constructor *
+*************************************************/
+ANSI_X931_RNG::ANSI_X931_RNG(const std::string& cipher_name,
+ RandomNumberGenerator* prng_ptr)
+ {
+ if(!prng_ptr)
+ throw Invalid_Argument("ANSI_X931_RNG constructor: NULL prng");
+
+ prng = prng_ptr;
+ cipher = get_block_cipher(cipher_name);
+
+ R.create(cipher->BLOCK_SIZE);
+ position = 0;
+ }
+
+/*************************************************
+* ANSI X931 RNG Destructor *
+*************************************************/
+ANSI_X931_RNG::~ANSI_X931_RNG()
+ {
+ delete cipher;
+ delete prng;
+ }
+
+}
diff --git a/src/rng/x931_rng/x931_rng.h b/src/rng/x931_rng/x931_rng.h
new file mode 100644
index 000000000..7914b605d
--- /dev/null
+++ b/src/rng/x931_rng/x931_rng.h
@@ -0,0 +1,42 @@
+/*************************************************
+* ANSI X9.31 RNG Header File *
+* (C) 1999-2008 Jack Lloyd *
+*************************************************/
+
+#ifndef BOTAN_ANSI_X931_RNG_H__
+#define BOTAN_ANSI_X931_RNG_H__
+
+#include <botan/rng.h>
+#include <botan/base.h>
+
+namespace Botan {
+
+/*************************************************
+* ANSI X9.31 RNG *
+*************************************************/
+class BOTAN_DLL ANSI_X931_RNG : public RandomNumberGenerator
+ {
+ public:
+ void randomize(byte[], u32bit);
+ bool is_seeded() const;
+ void clear() throw();
+ std::string name() const;
+
+ void reseed();
+ void add_entropy_source(EntropySource*);
+ void add_entropy(const byte[], u32bit);
+
+ ANSI_X931_RNG(const std::string&, RandomNumberGenerator*);
+ ~ANSI_X931_RNG();
+ private:
+ void update_buffer();
+
+ BlockCipher* cipher;
+ RandomNumberGenerator* prng;
+ SecureVector<byte> V, R;
+ u32bit position;
+ };
+
+}
+
+#endif