/src/botan/build/include/internal/botan/internal/xmss_address.h

Source (jump to first uncovered line)
/*
 * XMSS Address
 * (C) 2016 Matthias Gierlings
 *
 * Botan is released under the Simplified BSD License (see license.txt)
 **/

#ifndef BOTAN_XMSS_ADDRESS_H_
#define BOTAN_XMSS_ADDRESS_H_

#include <botan/secmem.h>
#include <botan/types.h>

namespace Botan {

/**
 * Generic XMSS Address type holding 256 Bits of data. Properties
 * of all three address formats L-Tree-Address, Hash-Tree-Address,
 * OTS-Hash-Address can be called depending on the type currently
 * assigned to the XMSS address using set_type().
 **/
class XMSS_Address final {
   public:
      /**
       * Distinct types an XMSS_Address can represent. The available types
       * are specified in [1] - 2.5 Hash Function Address Scheme.
       **/
      enum class Type : uint8_t { None = 255, OTS_Hash_Address = 0, LTree_Address = 1, Hash_Tree_Address = 2 };

      /**
       * The available modes for an XMSS Address:
       *   - Key_Mode: Used to generate the key.
       *   - Mask_Mode: Sets the n-byte bitmask (OTS-Hash-Address)
       *   - Mask_MSB_Mode: Used to generate the b most significant bytes of
       *     the 2n-byte bitmask (LTree Address and Hash Tree Address).
       *   - Mask_LSB_Mode: Used to generated the b least significant bytes
       *     of the 2n-byte bitmask. (LTree Address and Hash Tree Address).
       **/
      enum class Key_Mask : uint8_t { Key_Mode = 0, Mask_Mode = 1, Mask_MSB_Mode = 1, Mask_LSB_Mode = 2 };

      /**
       * Layer Address for XMSS is constantly zero and can not be changed this
       * property is only of relevance to XMSS_MT.
       *
       * @return Layer address, which is constant 0 for XMSS.
       **/
      uint8_t get_layer_addr() const { return 0; }

      /**
       * Layer Address for XMSS is constantly zero and can not be changed this
       * property is only of relevance to XMSS_MT. Calling this method for
       * XMSS will result in an error.
       **/
      void set_layer_addr() { BOTAN_ASSERT(false, "Only available in XMSS_MT."); }

      /**
       * Tree Address for XMSS is constantly zero and can not be changed this
       * property is only of relevance to XMSS_MT.
       *
       * @return Tree address, which is constant 0 for XMSS.
       **/
      uint64_t get_tree_addr() const { return 0; }

      /**
       * Tree Address for XMSS is constantly zero and can not be changed this
       * property is only of relevance to XMSS_MT. Calling this method for
       * XMSS will result in an error.
       **/
      void set_tree_addr() { BOTAN_ASSERT(false, "Only available in XMSS_MT."); }

      /**
       * retrieves the logical type currently assigned to the XMSS Address
       * instance.
       *
       * @return Type of the address (OTS_Hash_Address, LTree_Address or
       *         Hash_Tree_Address)
       **/
      Type get_type() const { return static_cast<Type>(m_data[15]); }

      /**
       * Changes the logical type currently assigned to the XMSS Address
       * instance. Please note that changing the type will automatically
       * reset the 128 LSBs of the Address to zero. This affects the
       * key_mask_mode property as well as all properties identified by
       * XMSS_Address::Property.
       *
       * @param type Type that shall be assigned to the address
       *        (OTS_Hash_Address, LTree_Address or Hash_Tree_Address)
       **/
      void set_type(Type type) {
         m_data[15] = static_cast<uint8_t>(type);
         std::fill(m_data.begin() + 16, m_data.end(), static_cast<uint8_t>(0));
      }

      /**
       * Retrieves the mode the address is currently set to. (See
       * XMSS_Address::Key_Mask for details.)
       *
       * @return currently active mode
       **/
      Key_Mask get_key_mask_mode() const { return Key_Mask(m_data[31]); }

      /**
       * Changes the mode the address currently used address mode.
       * (XMSS_Address::Key_Mask for details.)
       *
       * @param value Target mode.
       **/
      void set_key_mask_mode(Key_Mask value) {
         BOTAN_ASSERT(value != Key_Mask::Mask_LSB_Mode || get_type() != Type::OTS_Hash_Address,
                      "Invalid Key_Mask for current XMSS_Address::Type.");
         m_data[31] = static_cast<uint8_t>(value);
      }

      /**
       * Retrieve the index of the OTS key pair within the tree. A call to
       * this method is only valid, if the address type is set to
       * Type::OTS_Hash_Address.
       *
       * @return index of OTS key pair.
       **/
      uint32_t get_ots_address() const {
         BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
                      "get_ots_address() requires XMSS_Address::Type::"
                      "OTS_Hash_Address.");
         return get_hi32(2);
      }

      /**
       * Sets the index of the OTS key pair within the tree. A call to this
       * method is only valid, if the address type is set to
       * Type::OTS_Hash_Address.
       *
       * @param value index of OTS key pair.
       **/
      void set_ots_address(uint32_t value) {
         BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
                      "set_ots_address() requires XMSS_Address::Type::"
                      "OTS_Hash_Address.");
         set_hi32(2, value);
      }

      /**
       * Retrieves the index of the leaf computed with this LTree. A call to
       * this method is only valid, if the address type is set to
       * Type::LTree_Address.
       *
       * @return index of the leaf.
       **/
      uint32_t get_ltree_address() const {
         BOTAN_ASSERT(get_type() == Type::LTree_Address,
                      "set_ltree_address() requires XMSS_Address::Type::"
                      "LTree_Address.");
         return get_hi32(2);
      }

      /**
       * Sets the index of the leaf computed with this LTree. A call to this
       * method is only valid, if the address type is set to
       * Type::LTree_Address.
       *
       * @param value index of the leaf.
       **/
      void set_ltree_address(uint32_t value) {
         BOTAN_ASSERT(get_type() == Type::LTree_Address,
                      "set_ltree_address() requires XMSS_Address::Type::"
                      "LTree_Address.");
         set_hi32(2, value);
      }

      /**
       * Retrieve the chain address. A call to this method is only valid, if
       * the address type is set to Type::OTS_Hash_Address.
       *
       * @return chain address.
       **/
      uint32_t get_chain_address() const {
         BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
                      "get_chain_address() requires XMSS_Address::Type::"
                      "OTS_Hash_Address.");
         return get_lo32(2);
      }

      /**
       * Set the chain address. A call to this method is only valid, if
       * the address type is set to Type::OTS_Hash_Address.
       **/
      void set_chain_address(uint32_t value) {
         BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
                      "set_chain_address() requires XMSS_Address::Type::"
                      "OTS_Hash_Address.");
         set_lo32(2, value);
      }

      /**
       * Retrieves the height of the tree node to be computed within the
       * tree. A call to this method is only valid, if the address type is
       * set to Type::LTree_Address or Type::Hash_Tree_Address.
       *
       * @return height of the tree node.
       **/
      uint32_t get_tree_height() const {
         BOTAN_ASSERT(get_type() == Type::LTree_Address || get_type() == Type::Hash_Tree_Address,
                      "get_tree_height() requires XMSS_Address::Type::"
                      "LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
         return get_lo32(2);
      }

      /**
       * Sets the height of the tree node to be computed within the
       * tree. A call to this method is only valid, if the address type is
       * set to Type::LTree_Address or Type::Hash_Tree_Address.
       *
       * @param value height of the tree node.
       **/
      void set_tree_height(uint32_t value) {
         BOTAN_ASSERT(get_type() == Type::LTree_Address || get_type() == Type::Hash_Tree_Address,
                      "set_tree_height() requires XMSS_Address::Type::"
                      "LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
         set_lo32(2, value);
      }

      /**
       * Retrieves the address of the hash function call within the chain.
       * A call to this method is only valid, if the address type is
       * set to Type::OTS_Hash_Address.
       *
       * @return address of the hash function call within chain.
       **/
      uint32_t get_hash_address() const {
         BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
                      "get_hash_address() requires XMSS_Address::Type::"
                      "OTS_Hash_Address.");
         return get_hi32(3);
      }

      /**
       * Sets the address of the hash function call within the chain.
       * A call to this method is only valid, if the address type is
       * set to Type::OTS_Hash_Address.
       *
       * @param value address of the hash function call within chain.
       **/
      void set_hash_address(uint32_t value) {
         BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
                      "set_hash_address() requires XMSS_Address::Type::"
                      "OTS_Hash_Address.");
         set_hi32(3, value);
      }

      /**
       * Retrieves the index of the tree node at current tree height in the
       * tree. A call to this method is only valid, if the address type is
       * set to Type::LTree_Address or Type::Hash_Tree_Address.
       *
       * @return index of the tree node at current height.
       **/
      uint32_t get_tree_index() const {
         BOTAN_ASSERT(get_type() == Type::LTree_Address || get_type() == Type::Hash_Tree_Address,
                      "get_tree_index() requires XMSS_Address::Type::"
                      "LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
         return get_hi32(3);
      }

      /**
       * Sets the index of the tree node at current tree height in the
       * tree. A call to this method is only valid, if the address type is
       * set to Type::LTree_Address or Type::Hash_Tree_Address.
       *
       * @param value index of the tree node at current height.
       **/
      void set_tree_index(uint32_t value) {
         BOTAN_ASSERT(get_type() == Type::LTree_Address || get_type() == Type::Hash_Tree_Address,
                      "set_tree_index() requires XMSS_Address::Type::"
                      "LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
         set_hi32(3, value);
      }

      const secure_vector<uint8_t>& bytes() const { return m_data; }

      secure_vector<uint8_t>& bytes() { return m_data; }

      /**
       * @return the size of an XMSS_Address
       **/
      size_t size() const { return m_data.size(); }

      XMSS_Address() : m_data(m_address_size) { set_type(Type::None); }

      XMSS_Address(Type type) : m_data(m_address_size) { set_type(type); }

      XMSS_Address(secure_vector<uint8_t> data) : m_data(std::move(data)) {
         BOTAN_ASSERT(m_data.size() == m_address_size, "XMSS_Address must be of 256 bits size.");
      }

   protected:
      secure_vector<uint8_t> m_data;

   private:
      static const size_t m_address_size = 32;

      inline uint32_t get_hi32(size_t offset) const {
         return ((0x000000FF & m_data[8 * offset + 3]) | (0x000000FF & m_data[8 * offset + 2]) << 8 |
                 (0x000000FF & m_data[8 * offset + 1]) << 16 | (0x000000FF & m_data[8 * offset]) << 24);
      }

      inline void set_hi32(size_t offset, uint32_t value) {
         m_data[offset * 8] = ((value >> 24) & 0xFF);
         m_data[offset * 8 + 1] = ((value >> 16) & 0xFF);
         m_data[offset * 8 + 2] = ((value >> 8) & 0xFF);
         m_data[offset * 8 + 3] = ((value) & 0xFF);
      }

      inline uint32_t get_lo32(size_t offset) const {
         return ((0x000000FF & m_data[8 * offset + 7]) | (0x000000FF & m_data[8 * offset + 6]) << 8 |
                 (0x000000FF & m_data[8 * offset + 5]) << 16 | (0x000000FF & m_data[8 * offset + 4]) << 24);
      }

      inline void set_lo32(size_t offset, uint32_t value) {
         m_data[offset * 8 + 4] = ((value >> 24) & 0xFF);
         m_data[offset * 8 + 5] = ((value >> 16) & 0xFF);
         m_data[offset * 8 + 6] = ((value >> 8) & 0xFF);
         m_data[offset * 8 + 7] = ((value) & 0xFF);
      }
};

}  // namespace Botan

#endif

Coverage Report

Created: 2024-11-29 06:10

Line	Count	Source (jump to first uncovered line)
1		/*
2		* XMSS Address
3		* (C) 2016 Matthias Gierlings
4		*
5		* Botan is released under the Simplified BSD License (see license.txt)
6		**/
7
8		#ifndef BOTAN_XMSS_ADDRESS_H_
9		#define BOTAN_XMSS_ADDRESS_H_
10
11		#include <botan/secmem.h>
12		#include <botan/types.h>
13
14		namespace Botan {
15
16		/**
17		* Generic XMSS Address type holding 256 Bits of data. Properties
18		* of all three address formats L-Tree-Address, Hash-Tree-Address,
19		* OTS-Hash-Address can be called depending on the type currently
20		* assigned to the XMSS address using set_type().
21		**/
22		class XMSS_Address final {
23		public:
24		/**
25		* Distinct types an XMSS_Address can represent. The available types
26		* are specified in [1] - 2.5 Hash Function Address Scheme.
27		**/
28		enum class Type : uint8_t { None = 255, OTS_Hash_Address = 0, LTree_Address = 1, Hash_Tree_Address = 2 };
29
30		/**
31		* The available modes for an XMSS Address:
32		* - Key_Mode: Used to generate the key.
33		* - Mask_Mode: Sets the n-byte bitmask (OTS-Hash-Address)
34		* - Mask_MSB_Mode: Used to generate the b most significant bytes of
35		* the 2n-byte bitmask (LTree Address and Hash Tree Address).
36		* - Mask_LSB_Mode: Used to generated the b least significant bytes
37		* of the 2n-byte bitmask. (LTree Address and Hash Tree Address).
38		**/
39		enum class Key_Mask : uint8_t { Key_Mode = 0, Mask_Mode = 1, Mask_MSB_Mode = 1, Mask_LSB_Mode = 2 };
40
41		/**
42		* Layer Address for XMSS is constantly zero and can not be changed this
43		* property is only of relevance to XMSS_MT.
44		*
45		* @return Layer address, which is constant 0 for XMSS.
46		**/
47	0	uint8_t get_layer_addr() const { return 0; }
48
49		/**
50		* Layer Address for XMSS is constantly zero and can not be changed this
51		* property is only of relevance to XMSS_MT. Calling this method for
52		* XMSS will result in an error.
53		**/
54	0	void set_layer_addr() { BOTAN_ASSERT(false, "Only available in XMSS_MT."); }
55
56		/**
57		* Tree Address for XMSS is constantly zero and can not be changed this
58		* property is only of relevance to XMSS_MT.
59		*
60		* @return Tree address, which is constant 0 for XMSS.
61		**/
62	0	uint64_t get_tree_addr() const { return 0; }
63
64		/**
65		* Tree Address for XMSS is constantly zero and can not be changed this
66		* property is only of relevance to XMSS_MT. Calling this method for
67		* XMSS will result in an error.
68		**/
69	0	void set_tree_addr() { BOTAN_ASSERT(false, "Only available in XMSS_MT."); }
70
71		/**
72		* retrieves the logical type currently assigned to the XMSS Address
73		* instance.
74		*
75		* @return Type of the address (OTS_Hash_Address, LTree_Address or
76		* Hash_Tree_Address)
77		**/
78	0	Type get_type() const { return static_cast<Type>(m_data[15]); }
79
80		/**
81		* Changes the logical type currently assigned to the XMSS Address
82		* instance. Please note that changing the type will automatically
83		* reset the 128 LSBs of the Address to zero. This affects the
84		* key_mask_mode property as well as all properties identified by
85		* XMSS_Address::Property.
86		*
87		* @param type Type that shall be assigned to the address
88		* (OTS_Hash_Address, LTree_Address or Hash_Tree_Address)
89		**/
90	0	void set_type(Type type) {
91	0	m_data[15] = static_cast<uint8_t>(type);
92	0	std::fill(m_data.begin() + 16, m_data.end(), static_cast<uint8_t>(0));
93	0	}
94
95		/**
96		* Retrieves the mode the address is currently set to. (See
97		* XMSS_Address::Key_Mask for details.)
98		*
99		* @return currently active mode
100		**/
101	0	Key_Mask get_key_mask_mode() const { return Key_Mask(m_data[31]); }
102
103		/**
104		* Changes the mode the address currently used address mode.
105		* (XMSS_Address::Key_Mask for details.)
106		*
107		* @param value Target mode.
108		**/
109	0	void set_key_mask_mode(Key_Mask value) {
110	0	BOTAN_ASSERT(value != Key_Mask::Mask_LSB_Mode \|\| get_type() != Type::OTS_Hash_Address,
111	0	"Invalid Key_Mask for current XMSS_Address::Type.");
112	0	m_data[31] = static_cast<uint8_t>(value);
113	0	}
114
115		/**
116		* Retrieve the index of the OTS key pair within the tree. A call to
117		* this method is only valid, if the address type is set to
118		* Type::OTS_Hash_Address.
119		*
120		* @return index of OTS key pair.
121		**/
122	0	uint32_t get_ots_address() const {
123	0	BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
124	0	"get_ots_address() requires XMSS_Address::Type::"
125	0	"OTS_Hash_Address.");
126	0	return get_hi32(2);
127	0	}
128
129		/**
130		* Sets the index of the OTS key pair within the tree. A call to this
131		* method is only valid, if the address type is set to
132		* Type::OTS_Hash_Address.
133		*
134		* @param value index of OTS key pair.
135		**/
136	0	void set_ots_address(uint32_t value) {
137	0	BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
138	0	"set_ots_address() requires XMSS_Address::Type::"
139	0	"OTS_Hash_Address.");
140	0	set_hi32(2, value);
141	0	}
142
143		/**
144		* Retrieves the index of the leaf computed with this LTree. A call to
145		* this method is only valid, if the address type is set to
146		* Type::LTree_Address.
147		*
148		* @return index of the leaf.
149		**/
150	0	uint32_t get_ltree_address() const {
151	0	BOTAN_ASSERT(get_type() == Type::LTree_Address,
152	0	"set_ltree_address() requires XMSS_Address::Type::"
153	0	"LTree_Address.");
154	0	return get_hi32(2);
155	0	}
156
157		/**
158		* Sets the index of the leaf computed with this LTree. A call to this
159		* method is only valid, if the address type is set to
160		* Type::LTree_Address.
161		*
162		* @param value index of the leaf.
163		**/
164	0	void set_ltree_address(uint32_t value) {
165	0	BOTAN_ASSERT(get_type() == Type::LTree_Address,
166	0	"set_ltree_address() requires XMSS_Address::Type::"
167	0	"LTree_Address.");
168	0	set_hi32(2, value);
169	0	}
170
171		/**
172		* Retrieve the chain address. A call to this method is only valid, if
173		* the address type is set to Type::OTS_Hash_Address.
174		*
175		* @return chain address.
176		**/
177	0	uint32_t get_chain_address() const {
178	0	BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
179	0	"get_chain_address() requires XMSS_Address::Type::"
180	0	"OTS_Hash_Address.");
181	0	return get_lo32(2);
182	0	}
183
184		/**
185		* Set the chain address. A call to this method is only valid, if
186		* the address type is set to Type::OTS_Hash_Address.
187		**/
188	0	void set_chain_address(uint32_t value) {
189	0	BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
190	0	"set_chain_address() requires XMSS_Address::Type::"
191	0	"OTS_Hash_Address.");
192	0	set_lo32(2, value);
193	0	}
194
195		/**
196		* Retrieves the height of the tree node to be computed within the
197		* tree. A call to this method is only valid, if the address type is
198		* set to Type::LTree_Address or Type::Hash_Tree_Address.
199		*
200		* @return height of the tree node.
201		**/
202	0	uint32_t get_tree_height() const {
203	0	BOTAN_ASSERT(get_type() == Type::LTree_Address \|\| get_type() == Type::Hash_Tree_Address,
204	0	"get_tree_height() requires XMSS_Address::Type::"
205	0	"LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
206	0	return get_lo32(2);
207	0	}
208
209		/**
210		* Sets the height of the tree node to be computed within the
211		* tree. A call to this method is only valid, if the address type is
212		* set to Type::LTree_Address or Type::Hash_Tree_Address.
213		*
214		* @param value height of the tree node.
215		**/
216	0	void set_tree_height(uint32_t value) {
217	0	BOTAN_ASSERT(get_type() == Type::LTree_Address \|\| get_type() == Type::Hash_Tree_Address,
218	0	"set_tree_height() requires XMSS_Address::Type::"
219	0	"LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
220	0	set_lo32(2, value);
221	0	}
222
223		/**
224		* Retrieves the address of the hash function call within the chain.
225		* A call to this method is only valid, if the address type is
226		* set to Type::OTS_Hash_Address.
227		*
228		* @return address of the hash function call within chain.
229		**/
230	0	uint32_t get_hash_address() const {
231	0	BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
232	0	"get_hash_address() requires XMSS_Address::Type::"
233	0	"OTS_Hash_Address.");
234	0	return get_hi32(3);
235	0	}
236
237		/**
238		* Sets the address of the hash function call within the chain.
239		* A call to this method is only valid, if the address type is
240		* set to Type::OTS_Hash_Address.
241		*
242		* @param value address of the hash function call within chain.
243		**/
244	0	void set_hash_address(uint32_t value) {
245	0	BOTAN_ASSERT(get_type() == Type::OTS_Hash_Address,
246	0	"set_hash_address() requires XMSS_Address::Type::"
247	0	"OTS_Hash_Address.");
248	0	set_hi32(3, value);
249	0	}
250
251		/**
252		* Retrieves the index of the tree node at current tree height in the
253		* tree. A call to this method is only valid, if the address type is
254		* set to Type::LTree_Address or Type::Hash_Tree_Address.
255		*
256		* @return index of the tree node at current height.
257		**/
258	0	uint32_t get_tree_index() const {
259	0	BOTAN_ASSERT(get_type() == Type::LTree_Address \|\| get_type() == Type::Hash_Tree_Address,
260	0	"get_tree_index() requires XMSS_Address::Type::"
261	0	"LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
262	0	return get_hi32(3);
263	0	}
264
265		/**
266		* Sets the index of the tree node at current tree height in the
267		* tree. A call to this method is only valid, if the address type is
268		* set to Type::LTree_Address or Type::Hash_Tree_Address.
269		*
270		* @param value index of the tree node at current height.
271		**/
272	0	void set_tree_index(uint32_t value) {
273	0	BOTAN_ASSERT(get_type() == Type::LTree_Address \|\| get_type() == Type::Hash_Tree_Address,
274	0	"set_tree_index() requires XMSS_Address::Type::"
275	0	"LTree_Address or XMSS_Address::Type::Hash_Tree_Address.");
276	0	set_hi32(3, value);
277	0	}
278
279	0	const secure_vector<uint8_t>& bytes() const { return m_data; }
280
281	0	secure_vector<uint8_t>& bytes() { return m_data; }
282
283		/**
284		* @return the size of an XMSS_Address
285		**/
286	0	size_t size() const { return m_data.size(); }
287
288	0	XMSS_Address() : m_data(m_address_size) { set_type(Type::None); }
289
290	0	XMSS_Address(Type type) : m_data(m_address_size) { set_type(type); }
291
292	0	XMSS_Address(secure_vector<uint8_t> data) : m_data(std::move(data)) {
293	0	BOTAN_ASSERT(m_data.size() == m_address_size, "XMSS_Address must be of 256 bits size.");
294	0	}
295
296		protected:
297		secure_vector<uint8_t> m_data;
298
299		private:
300		static const size_t m_address_size = 32;
301
302	0	inline uint32_t get_hi32(size_t offset) const {
303	0	return ((0x000000FF & m_data[8 * offset + 3]) \| (0x000000FF & m_data[8 * offset + 2]) << 8 \|
304	0	(0x000000FF & m_data[8 * offset + 1]) << 16 \| (0x000000FF & m_data[8 * offset]) << 24);
305	0	}
306
307	0	inline void set_hi32(size_t offset, uint32_t value) {
308	0	m_data[offset * 8] = ((value >> 24) & 0xFF);
309	0	m_data[offset * 8 + 1] = ((value >> 16) & 0xFF);
310	0	m_data[offset * 8 + 2] = ((value >> 8) & 0xFF);
311	0	m_data[offset * 8 + 3] = ((value) & 0xFF);
312	0	}
313
314	0	inline uint32_t get_lo32(size_t offset) const {
315	0	return ((0x000000FF & m_data[8 * offset + 7]) \| (0x000000FF & m_data[8 * offset + 6]) << 8 \|
316	0	(0x000000FF & m_data[8 * offset + 5]) << 16 \| (0x000000FF & m_data[8 * offset + 4]) << 24);
317	0	}
318
319	0	inline void set_lo32(size_t offset, uint32_t value) {
320	0	m_data[offset * 8 + 4] = ((value >> 24) & 0xFF);
321	0	m_data[offset * 8 + 5] = ((value >> 16) & 0xFF);
322	0	m_data[offset * 8 + 6] = ((value >> 8) & 0xFF);
323	0	m_data[offset * 8 + 7] = ((value) & 0xFF);
324	0	}
325		};
326
327		} // namespace Botan
328
329		#endif