1 files changed, 100 insertions, 0 deletions
diff --git a/src/libs/3rdparty/botan/src/lib/base/key_spec.h b/src/libs/3rdparty/botan/src/lib/base/key_spec.h
new file mode 100644
index 0000000000..6db20a9b63
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+++ b/src/libs/3rdparty/botan/src/lib/base/key_spec.h
@@ -0,0 +1,100 @@
+/*
+* Symmetric Key Length Specification
+* (C) 2010 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_KEY_LEN_SPECIFICATION_H_
+#define BOTAN_KEY_LEN_SPECIFICATION_H_
+
+#include <botan/types.h>
+
+namespace Botan {
+
+/**
+* Represents the length requirements on an algorithm key
+*/
+class BOTAN_PUBLIC_API(2,0) Key_Length_Specification final
+   {
+   public:
+      /**
+      * Constructor for fixed length keys
+      * @param keylen the supported key length
+      */
+      explicit Key_Length_Specification(size_t keylen) :
+         m_min_keylen(keylen),
+         m_max_keylen(keylen),
+         m_keylen_mod(1)
+         {
+         }
+
+      /**
+      * Constructor for variable length keys
+      * @param min_k the smallest supported key length
+      * @param max_k the largest supported key length
+      * @param k_mod the number of bytes the key must be a multiple of
+      */
+      Key_Length_Specification(size_t min_k,
+                               size_t max_k,
+                               size_t k_mod = 1) :
+         m_min_keylen(min_k),
+         m_max_keylen(max_k ? max_k : min_k),
+         m_keylen_mod(k_mod)
+         {
+         }
+
+      /**
+      * @param length is a key length in bytes
+      * @return true iff this length is a valid length for this algo
+      */
+      bool valid_keylength(size_t length) const
+         {
+         return ((length >= m_min_keylen) &&
+                 (length <= m_max_keylen) &&
+                 (length % m_keylen_mod == 0));
+         }
+
+      /**
+      * @return minimum key length in bytes
+      */
+      size_t minimum_keylength() const
+         {
+         return m_min_keylen;
+         }
+
+      /**
+      * @return maximum key length in bytes
+      */
+      size_t maximum_keylength() const
+         {
+         return m_max_keylen;
+         }
+
+      /**
+      * @return key length multiple in bytes
+      */
+      size_t keylength_multiple() const
+         {
+         return m_keylen_mod;
+         }
+
+      /*
+      * Multiplies all length requirements with the given factor
+      * @param n the multiplication factor
+      * @return a key length specification multiplied by the factor
+      */
+      Key_Length_Specification multiple(size_t n) const
+         {
+         return Key_Length_Specification(n * m_min_keylen,
+                                         n * m_max_keylen,
+                                         n * m_keylen_mod);
+         }
+
+   private:
+      size_t m_min_keylen, m_max_keylen, m_keylen_mod;
+   };
+
+}
+
+#endif