Botan  1.10.9
ossl_md.cpp
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1 /*
2 * OpenSSL Hash Functions
3 * (C) 1999-2007 Jack Lloyd
4 *
5 * Distributed under the terms of the Botan license
6 */
7 
8 #include <botan/internal/openssl_engine.h>
9 #include <openssl/evp.h>
10 
11 namespace Botan {
12 
13 namespace {
14 
15 /*
16 * EVP Hash Function
17 */
18 class EVP_HashFunction : public HashFunction
19  {
20  public:
21  void clear();
22  std::string name() const { return algo_name; }
23  HashFunction* clone() const;
24 
25  size_t output_length() const
26  {
27  return EVP_MD_size(EVP_MD_CTX_md(&md));
28  }
29 
30  size_t hash_block_size() const
31  {
32  return EVP_MD_block_size(EVP_MD_CTX_md(&md));
33  }
34 
35  EVP_HashFunction(const EVP_MD*, const std::string&);
36  ~EVP_HashFunction();
37  private:
38  void add_data(const byte[], size_t);
39  void final_result(byte[]);
40 
41  size_t block_size;
42  std::string algo_name;
43  EVP_MD_CTX md;
44  };
45 
46 /*
47 * Update an EVP Hash Calculation
48 */
49 void EVP_HashFunction::add_data(const byte input[], size_t length)
50  {
51  EVP_DigestUpdate(&md, input, length);
52  }
53 
54 /*
55 * Finalize an EVP Hash Calculation
56 */
57 void EVP_HashFunction::final_result(byte output[])
58  {
59  EVP_DigestFinal_ex(&md, output, 0);
60  const EVP_MD* algo = EVP_MD_CTX_md(&md);
61  EVP_DigestInit_ex(&md, algo, 0);
62  }
63 
64 /*
65 * Clear memory of sensitive data
66 */
67 void EVP_HashFunction::clear()
68  {
69  const EVP_MD* algo = EVP_MD_CTX_md(&md);
70  EVP_DigestInit_ex(&md, algo, 0);
71  }
72 
73 /*
74 * Return a clone of this object
75 */
76 HashFunction* EVP_HashFunction::clone() const
77  {
78  const EVP_MD* algo = EVP_MD_CTX_md(&md);
79  return new EVP_HashFunction(algo, name());
80  }
81 
82 /*
83 * Create an EVP hash function
84 */
85 EVP_HashFunction::EVP_HashFunction(const EVP_MD* algo,
86  const std::string& name) :
87  algo_name(name)
88  {
89  EVP_MD_CTX_init(&md);
90  EVP_DigestInit_ex(&md, algo, 0);
91  }
92 
93 /*
94 * Destroy an EVP hash function
95 */
96 EVP_HashFunction::~EVP_HashFunction()
97  {
98  EVP_MD_CTX_cleanup(&md);
99  }
100 
101 }
102 
103 /*
104 * Look for an algorithm with this name
105 */
106 HashFunction* OpenSSL_Engine::find_hash(const SCAN_Name& request,
107  Algorithm_Factory&) const
108  {
109 #if !defined(OPENSSL_NO_SHA)
110  if(request.algo_name() == "SHA-160")
111  return new EVP_HashFunction(EVP_sha1(), "SHA-160");
112 #endif
113 
114 #if !defined(OPENSSL_NO_SHA256)
115  if(request.algo_name() == "SHA-224")
116  return new EVP_HashFunction(EVP_sha224(), "SHA-224");
117  if(request.algo_name() == "SHA-256")
118  return new EVP_HashFunction(EVP_sha256(), "SHA-256");
119 #endif
120 
121 #if !defined(OPENSSL_NO_SHA512)
122  if(request.algo_name() == "SHA-384")
123  return new EVP_HashFunction(EVP_sha384(), "SHA-384");
124  if(request.algo_name() == "SHA-512")
125  return new EVP_HashFunction(EVP_sha512(), "SHA-512");
126 #endif
127 
128 #if !defined(OPENSSL_NO_MD2)
129  if(request.algo_name() == "MD2")
130  return new EVP_HashFunction(EVP_md2(), "MD2");
131 #endif
132 
133 #if !defined(OPENSSL_NO_MD4)
134  if(request.algo_name() == "MD4")
135  return new EVP_HashFunction(EVP_md4(), "MD4");
136 #endif
137 
138 #if !defined(OPENSSL_NO_MD5)
139  if(request.algo_name() == "MD5")
140  return new EVP_HashFunction(EVP_md5(), "MD5");
141 #endif
142 
143 #if !defined(OPENSSL_NO_RIPEMD)
144  if(request.algo_name() == "RIPEMD-160")
145  return new EVP_HashFunction(EVP_ripemd160(), "RIPEMD-160");
146 #endif
147 
148  return 0;
149  }
150 
151 }
size_t block_size
Definition: ossl_md.cpp:41
unsigned char byte
Definition: types.h:22
std::string algo_name() const
Definition: scan_name.h:37
std::string algo_name
Definition: ossl_md.cpp:42
EVP_MD_CTX md
Definition: ossl_md.cpp:43