3 files changed, 189 insertions, 0 deletions
diff --git a/src/lib/pk_pad/emsa_pkcs1/emsa_pkcs1.cpp b/src/lib/pk_pad/emsa_pkcs1/emsa_pkcs1.cpp
new file mode 100644
index 000000000..3ba236784
--- /dev/null
+++ b/src/lib/pk_pad/emsa_pkcs1/emsa_pkcs1.cpp
@@ -0,0 +1,116 @@
+/*
+* PKCS #1 v1.5 signature padding
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/emsa_pkcs1.h>
+#include <botan/hash_id.h>
+
+namespace Botan {
+
+namespace {
+
+secure_vector<byte> emsa3_encoding(const secure_vector<byte>& msg,
+                                   size_t output_bits,
+                                   const byte hash_id[],
+                                   size_t hash_id_length)
+   {
+   size_t output_length = output_bits / 8;
+   if(output_length < hash_id_length + msg.size() + 10)
+      throw Encoding_Error("emsa3_encoding: Output length is too small");
+
+   secure_vector<byte> T(output_length);
+   const size_t P_LENGTH = output_length - msg.size() - hash_id_length - 2;
+
+   T[0] = 0x01;
+   set_mem(&T[1], P_LENGTH, 0xFF);
+   T[P_LENGTH+1] = 0x00;
+   buffer_insert(T, P_LENGTH+2, hash_id, hash_id_length);
+   buffer_insert(T, output_length-msg.size(), &msg[0], msg.size());
+   return T;
+   }
+
+}
+
+void EMSA_PKCS1v15::update(const byte input[], size_t length)
+   {
+   m_hash->update(input, length);
+   }
+
+secure_vector<byte> EMSA_PKCS1v15::raw_data()
+   {
+   return m_hash->final();
+   }
+
+secure_vector<byte>
+EMSA_PKCS1v15::encoding_of(const secure_vector<byte>& msg,
+                           size_t output_bits,
+                           RandomNumberGenerator&)
+   {
+   if(msg.size() != m_hash->output_length())
+      throw Encoding_Error("EMSA_PKCS1v15::encoding_of: Bad input length");
+
+   return emsa3_encoding(msg, output_bits,
+                         &m_hash_id[0], m_hash_id.size());
+   }
+
+bool EMSA_PKCS1v15::verify(const secure_vector<byte>& coded,
+                           const secure_vector<byte>& raw,
+                           size_t key_bits)
+   {
+   if(raw.size() != m_hash->output_length())
+      return false;
+
+   try
+      {
+      return (coded == emsa3_encoding(raw, key_bits,
+                                      &m_hash_id[0], m_hash_id.size()));
+      }
+   catch(...)
+      {
+      return false;
+      }
+   }
+
+EMSA_PKCS1v15::EMSA_PKCS1v15(HashFunction* hash) : m_hash(hash)
+   {
+   m_hash_id = pkcs_hash_id(m_hash->name());
+   }
+
+void EMSA_PKCS1v15_Raw::update(const byte input[], size_t length)
+   {
+   message += std::make_pair(input, length);
+   }
+
+secure_vector<byte> EMSA_PKCS1v15_Raw::raw_data()
+   {
+   secure_vector<byte> ret;
+   std::swap(ret, message);
+   return ret;
+   }
+
+secure_vector<byte>
+EMSA_PKCS1v15_Raw::encoding_of(const secure_vector<byte>& msg,
+                               size_t output_bits,
+                               RandomNumberGenerator&)
+   {
+   return emsa3_encoding(msg, output_bits, nullptr, 0);
+   }
+
+bool EMSA_PKCS1v15_Raw::verify(const secure_vector<byte>& coded,
+                               const secure_vector<byte>& raw,
+                               size_t key_bits)
+   {
+   try
+      {
+      return (coded == emsa3_encoding(raw, key_bits, nullptr, 0));
+      }
+   catch(...)
+      {
+      return false;
+      }
+   }
+
+}
diff --git a/src/lib/pk_pad/emsa_pkcs1/emsa_pkcs1.h b/src/lib/pk_pad/emsa_pkcs1/emsa_pkcs1.h
new file mode 100644
index 000000000..5c7b38c0c
--- /dev/null
+++ b/src/lib/pk_pad/emsa_pkcs1/emsa_pkcs1.h
@@ -0,0 +1,67 @@
+/*
+* PKCS #1 v1.5 signature padding
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_EMSA_PKCS1_H__
+#define BOTAN_EMSA_PKCS1_H__
+
+#include <botan/emsa.h>
+#include <botan/hash.h>
+
+namespace Botan {
+
+/**
+* PKCS #1 v1.5 signature padding
+* aka PKCS #1 block type 1
+* aka EMSA3 from IEEE 1363
+*/
+class BOTAN_DLL EMSA_PKCS1v15 : public EMSA
+   {
+   public:
+      /**
+      * @param hash the hash object to use
+      */
+      EMSA_PKCS1v15(HashFunction* hash);
+
+      void update(const byte[], size_t);
+
+      secure_vector<byte> raw_data();
+
+      secure_vector<byte> encoding_of(const secure_vector<byte>&, size_t,
+                                     RandomNumberGenerator& rng);
+
+      bool verify(const secure_vector<byte>&, const secure_vector<byte>&,
+                  size_t);
+   private:
+      std::unique_ptr<HashFunction> m_hash;
+      std::vector<byte> m_hash_id;
+   };
+
+/**
+* EMSA_PKCS1v15_Raw which is EMSA_PKCS1v15 without a hash or digest id
+* (which according to QCA docs is "identical to PKCS#11's CKM_RSA_PKCS
+* mechanism", something I have not confirmed)
+*/
+class BOTAN_DLL EMSA_PKCS1v15_Raw : public EMSA
+   {
+   public:
+      void update(const byte[], size_t);
+
+      secure_vector<byte> raw_data();
+
+      secure_vector<byte> encoding_of(const secure_vector<byte>&, size_t,
+                                     RandomNumberGenerator& rng);
+
+      bool verify(const secure_vector<byte>&, const secure_vector<byte>&,
+                  size_t);
+
+   private:
+      secure_vector<byte> message;
+   };
+
+}
+
+#endif
diff --git a/src/lib/pk_pad/emsa_pkcs1/info.txt b/src/lib/pk_pad/emsa_pkcs1/info.txt
new file mode 100644
index 000000000..f497b45e3
--- /dev/null
+++ b/src/lib/pk_pad/emsa_pkcs1/info.txt
@@ -0,0 +1,6 @@
+define EMSA_PKCS1 20140118
+
+<requires>
+hash
+hash_id
+</requires>