From e89b6a365e56283a945aeda8ed2b427937fe5d91 Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Sat, 29 Nov 2014 14:16:26 +0000
Subject: Move all PK workfactor esstimators to workfactors.*

---
 src/lib/pubkey/ecc_key/ecc_key.cpp  |  3 ++-
 src/lib/pubkey/mce/mceliece_key.cpp |  9 +++++++--
 src/lib/pubkey/mce/mceliece_key.h   |  3 +--
 src/lib/pubkey/workfactor.cpp       | 10 ++++++++++
 src/lib/pubkey/workfactor.h         | 13 +++++++++++++
 5 files changed, 33 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/lib/pubkey/ecc_key/ecc_key.cpp b/src/lib/pubkey/ecc_key/ecc_key.cpp
index c9d4d62fe..7f82af4f5 100644
--- a/src/lib/pubkey/ecc_key/ecc_key.cpp
+++ b/src/lib/pubkey/ecc_key/ecc_key.cpp
@@ -14,12 +14,13 @@
 #include <botan/ber_dec.h>
 #include <botan/secmem.h>
 #include <botan/point_gfp.h>
+#include <botan/workfactor.h>
 
 namespace Botan {
 
 size_t EC_PublicKey::estimated_strength() const
    {
-   return domain().get_curve().get_p().bits() / 2;
+   return ecp_work_factor(domain().get_curve().get_p().bits());
    }
 
 EC_PublicKey::EC_PublicKey(const EC_Group& dom_par,
diff --git a/src/lib/pubkey/mce/mceliece_key.cpp b/src/lib/pubkey/mce/mceliece_key.cpp
index 71e0ec4e8..7da5aefed 100644
--- a/src/lib/pubkey/mce/mceliece_key.cpp
+++ b/src/lib/pubkey/mce/mceliece_key.cpp
@@ -14,10 +14,10 @@
 #include <botan/gf2m_small_m.h>
 #include <botan/mceliece.h>
 #include <botan/internal/code_based_key_gen.h>
-#include <botan/alg_id.h>
+#include <botan/code_based_util.h>
 #include <botan/der_enc.h>
 #include <botan/ber_dec.h>
-#include <botan/oids.h>
+#include <botan/workfactor.h>
 
 namespace Botan {
 
@@ -74,6 +74,11 @@ McEliece_PublicKey::McEliece_PublicKey(const McEliece_PublicKey & other) :
    {
    }
 
+size_t McEliece_PublicKey::estimated_strength() const
+   {
+   return mceliece_work_factor(m_t, m_code_length);
+   }
+
 McEliece_PublicKey::McEliece_PublicKey(const std::vector<byte>& key_bits)
    {
    BER_Decoder dec(key_bits);
diff --git a/src/lib/pubkey/mce/mceliece_key.h b/src/lib/pubkey/mce/mceliece_key.h
index c51745bba..1a9a699f4 100644
--- a/src/lib/pubkey/mce/mceliece_key.h
+++ b/src/lib/pubkey/mce/mceliece_key.h
@@ -15,7 +15,6 @@
 #include <botan/exceptn.h>
 #include <botan/pk_keys.h>
 #include <botan/polyn_gf2m.h>
-#include <botan/code_based_util.h>
 
 namespace Botan {
 
@@ -47,7 +46,7 @@ class BOTAN_DLL McEliece_PublicKey : public virtual Public_Key
 
       AlgorithmIdentifier algorithm_identifier() const;
 
-      size_t estimated_strength() const { return 0; }
+      size_t estimated_strength() const;
 
       std::vector<byte> x509_subject_public_key() const;
 
diff --git a/src/lib/pubkey/workfactor.cpp b/src/lib/pubkey/workfactor.cpp
index b917ce52d..972d03af9 100644
--- a/src/lib/pubkey/workfactor.cpp
+++ b/src/lib/pubkey/workfactor.cpp
@@ -11,6 +11,16 @@
 
 namespace Botan {
 
+size_t mceliece_work_factor(size_t code_size, size_t t)
+   {
+   return 0;
+   }
+
+size_t ecp_work_factor(size_t bits)
+   {
+   return bits / 2;
+   }
+
 size_t dl_work_factor(size_t bits)
    {
    /*
diff --git a/src/lib/pubkey/workfactor.h b/src/lib/pubkey/workfactor.h
index 179b580e7..37f487234 100644
--- a/src/lib/pubkey/workfactor.h
+++ b/src/lib/pubkey/workfactor.h
@@ -19,6 +19,19 @@ namespace Botan {
 */
 size_t dl_work_factor(size_t prime_group_size);
 
+/**
+* Estimate work factor for EC discrete logarithm
+* @param prime_group_size size of the group in bits
+* @return estimated security level for this group
+*/
+size_t ecp_work_factor(size_t prime_group_size);
+
+/**
+* Estimate work factor for McEliece
+* @return estimated security level for this group
+*/
+size_t mceliece_work_factor(size_t code_size, size_t t);
+
 }
 
 #endif
-- 
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