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authorAlexander Harkness <bearbin@gmail.com>2013-11-24 15:21:13 +0100
committerAlexander Harkness <bearbin@gmail.com>2013-11-24 15:21:13 +0100
commit3438e5d3ddf8444f0e31009ffbe8237ef3752c22 (patch)
tree7c2f76d5e9281c130e60fb932c4dda89a49863b6 /lib/cryptopp/eax.cpp
parentMoved source to src (diff)
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Diffstat (limited to 'lib/cryptopp/eax.cpp')
-rw-r--r--lib/cryptopp/eax.cpp59
1 files changed, 59 insertions, 0 deletions
diff --git a/lib/cryptopp/eax.cpp b/lib/cryptopp/eax.cpp
new file mode 100644
index 000000000..2728c9bcd
--- /dev/null
+++ b/lib/cryptopp/eax.cpp
@@ -0,0 +1,59 @@
+// eax.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "eax.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void EAX_Base::SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params)
+{
+ AccessMAC().SetKey(userKey, keylength, params);
+ m_buffer.New(2*AccessMAC().TagSize());
+}
+
+void EAX_Base::Resync(const byte *iv, size_t len)
+{
+ MessageAuthenticationCode &mac = AccessMAC();
+ unsigned int blockSize = mac.TagSize();
+
+ memset(m_buffer, 0, blockSize);
+ mac.Update(m_buffer, blockSize);
+ mac.CalculateDigest(m_buffer+blockSize, iv, len);
+
+ m_buffer[blockSize-1] = 1;
+ mac.Update(m_buffer, blockSize);
+
+ m_ctr.SetCipherWithIV(AccessMAC().AccessCipher(), m_buffer+blockSize, blockSize);
+}
+
+size_t EAX_Base::AuthenticateBlocks(const byte *data, size_t len)
+{
+ AccessMAC().Update(data, len);
+ return 0;
+}
+
+void EAX_Base::AuthenticateLastHeaderBlock()
+{
+ assert(m_bufferedDataLength == 0);
+ MessageAuthenticationCode &mac = AccessMAC();
+ unsigned int blockSize = mac.TagSize();
+
+ mac.Final(m_buffer);
+ xorbuf(m_buffer+blockSize, m_buffer, blockSize);
+
+ memset(m_buffer, 0, blockSize);
+ m_buffer[blockSize-1] = 2;
+ mac.Update(m_buffer, blockSize);
+}
+
+void EAX_Base::AuthenticateLastFooterBlock(byte *tag, size_t macSize)
+{
+ assert(m_bufferedDataLength == 0);
+ MessageAuthenticationCode &mac = AccessMAC();
+ unsigned int blockSize = mac.TagSize();
+
+ mac.TruncatedFinal(m_buffer, macSize);
+ xorbuf(tag, m_buffer, m_buffer+blockSize, macSize);
+}
+
+NAMESPACE_END