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xmss_signature_operation.cpp
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1 /*
2 * XMSS Signature Operation
3 * Signature generation operation for Extended Hash-Based Signatures (XMSS) as
4 * defined in:
5 *
6 * [1] XMSS: Extended Hash-Based Signatures,
7 * draft-itrf-cfrg-xmss-hash-based-signatures-06
8 * Release: July 2016.
9 * https://datatracker.ietf.org/doc/
10 * draft-irtf-cfrg-xmss-hash-based-signatures/?include_text=1
11 *
12 * (C) 2016 Matthias Gierlings
13 *
14 * Botan is released under the Simplified BSD License (see license.txt)
15 **/
16
17 #include <botan/internal/xmss_signature_operation.h>
18
19 namespace Botan {
20
21 XMSS_Signature_Operation::XMSS_Signature_Operation(
22 const XMSS_PrivateKey& private_key)
23 : XMSS_Common_Ops(private_key.xmss_oid()),
24 m_priv_key(private_key),
25 m_randomness(0),
26 m_leaf_idx(0),
27 m_is_initialized(false)
28 {}
29
30 XMSS_WOTS_PublicKey::TreeSignature
31 XMSS_Signature_Operation::generate_tree_signature(const secure_vector<uint8_t>& msg,
32 XMSS_PrivateKey& xmss_priv_key,
33 XMSS_Address& adrs)
34 {
35
36 wots_keysig_t auth_path = build_auth_path(xmss_priv_key, adrs);
37 adrs.set_type(XMSS_Address::Type::OTS_Hash_Address);
38 adrs.set_ots_address(m_leaf_idx);
39
40 wots_keysig_t sig_ots = xmss_priv_key.wots_private_key().sign(msg, adrs);
41 return XMSS_WOTS_PublicKey::TreeSignature(sig_ots, auth_path);
42 }
43
44 XMSS_Signature
45 XMSS_Signature_Operation::sign(const secure_vector<uint8_t>& msg_hash,
46 XMSS_PrivateKey& xmss_priv_key)
47 {
48 XMSS_Address adrs;
49 XMSS_Signature sig(m_leaf_idx,
50 m_randomness,
51 generate_tree_signature(msg_hash, xmss_priv_key,adrs));
52 return sig;
53 }
54
55 wots_keysig_t
56 XMSS_Signature_Operation::build_auth_path(XMSS_PrivateKey& priv_key,
57 XMSS_Address& adrs)
58 {
59 wots_keysig_t auth_path(m_xmss_params.tree_height());
60 adrs.set_type(XMSS_Address::Type::Hash_Tree_Address);
61
62 for(size_t j = 0; j < m_xmss_params.tree_height(); j++)
63 {
64 size_t k = (m_leaf_idx / (1 << j)) ^ 0x01;
65 auth_path[j] = priv_key.tree_hash(k * (1 << j), j, adrs);
66 }
67
68 return auth_path;
69 }
70
71 void XMSS_Signature_Operation::update(const uint8_t msg[], size_t msg_len)
72 {
73 initialize();
74 m_hash.h_msg_update(msg, msg_len);
75 }
76
77
78 secure_vector<uint8_t>
79 XMSS_Signature_Operation::sign(RandomNumberGenerator&)
80 {
81 initialize();
82 secure_vector<uint8_t> signature(sign(m_hash.h_msg_final(),
83 m_priv_key).bytes());
84 m_is_initialized = false;
85 return signature;
86 }
87
88 void XMSS_Signature_Operation::initialize()
89 {
90 // return if we already initialized and reserved a leaf index for signing.
91 if(m_is_initialized)
92 return;
93
94 secure_vector<uint8_t> index_bytes;
95 // reserve leaf index so it can not be reused in by another signature
96 // operation using the same private key.
97 m_leaf_idx = m_priv_key.reserve_unused_leaf_index();
98
99 // write prefix for message hashing into buffer.
100 XMSS_Tools::concat(index_bytes, m_leaf_idx, 32);
101 m_randomness = m_hash.prf(m_priv_key.prf(), index_bytes);
102 index_bytes.clear();
103 XMSS_Tools::concat(index_bytes, m_leaf_idx,
104 m_priv_key.xmss_parameters().element_size());
105 m_hash.h_msg_init(m_randomness,
106 m_priv_key.root(),
107 index_bytes);
108 m_is_initialized = true;
109 }
110
111 }
112
Botan::XMSS_Common_Ops
Definition: xmss_common_ops.h:25
Botan::XMSS_Parameters::element_size
size_t element_size() const
Definition: xmss_parameters.h:72
Botan::XMSS_Hash::h_msg_final
secure_vector< uint8_t > h_msg_final()
Definition: xmss_hash.cpp:69
Botan::XMSS_Hash::h_msg_update
void h_msg_update(const secure_vector< uint8_t > &data)
Definition: xmss_hash.cpp:59
Botan::RandomNumberGenerator
Definition: rng.h:25
Botan::XMSS_Address::set_ots_address
void set_ots_address(uint32_t value)
Definition: xmss_address.h:166
Botan::XMSS_Signature_Operation::XMSS_Signature_Operation
XMSS_Signature_Operation(const XMSS_PrivateKey &private_key)
Definition: xmss_signature_operation.cpp:21
Botan::XMSS_Address::Type::OTS_Hash_Address
Botan::XMSS_WOTS_PrivateKey::sign
wots_keysig_t sign(const secure_vector< uint8_t > &msg, XMSS_Address &adrs)
Definition: xmss_wots_privatekey.cpp:59
Botan::XMSS_Parameters::tree_height
size_t tree_height() const
Definition: xmss_parameters.h:77
Botan::XMSS_Address
Definition: xmss_address.h:23
Botan::XMSS_PrivateKey::reserve_unused_leaf_index
size_t reserve_unused_leaf_index()
Definition: xmss_privatekey.h:139
Botan::XMSS_PublicKey::xmss_parameters
const XMSS_Parameters & xmss_parameters() const
Definition: xmss_publickey.h:122
Botan::secure_vector
std::vector< T, secure_allocator< T >> secure_vector
Definition: secmem.h:121
Botan::XMSS_Hash::prf
void prf(secure_vector< uint8_t > &result, const secure_vector< uint8_t > &key, const secure_vector< uint8_t > &data)
Definition: xmss_hash.h:38
Botan::XMSS_Address::set_type
void set_type(Type type)
Definition: xmss_address.h:113
Botan::XMSS_PrivateKey
Definition: xmss_privatekey.h:40
Botan::XMSS_PublicKey::root
secure_vector< uint8_t > & root()
Definition: xmss_publickey.h:149
Botan::XMSS_Common_Ops::m_xmss_params
XMSS_Parameters m_xmss_params
Definition: xmss_common_ops.h:68
Botan::XMSS_WOTS_PublicKey::TreeSignature
Definition: xmss_wots_publickey.h:35
Botan::XMSS_Common_Ops::m_hash
XMSS_Hash m_hash
Definition: xmss_common_ops.h:69
Botan
Definition: alg_id.cpp:13
Botan::wots_keysig_t
std::vector< secure_vector< uint8_t > > wots_keysig_t
Definition: xmss_common_ops.h:20
Botan::XMSS_Tools::concat
static void concat(secure_vector< uint8_t > &target, const T &src)
Definition: xmss_tools.h:63
Botan::XMSS_Hash::h_msg_init
void h_msg_init(const secure_vector< uint8_t > &randomness, const secure_vector< uint8_t > &root, const secure_vector< uint8_t > &index_bytes)
Definition: xmss_hash.cpp:47
Botan::XMSS_PrivateKey::prf
const secure_vector< uint8_t > & prf() const
Definition: xmss_privatekey.h:173
Botan::XMSS_Address::Type::Hash_Tree_Address
Botan::XMSS_Signature_Operation::sign
secure_vector< uint8_t > sign(RandomNumberGenerator &) override
Definition: xmss_signature_operation.cpp:79
Botan::XMSS_Signature_Operation::update
void update(const uint8_t msg[], size_t msg_len) override
Definition: xmss_signature_operation.cpp:71
Botan::XMSS_PrivateKey::wots_private_key
const XMSS_WOTS_PrivateKey & wots_private_key() const
Definition: xmss_privatekey.h:157