summaryrefslogtreecommitdiffstats
path: root/src/lib/cryptolink/openssl_hash.cc
blob: 68f2285e1547d114a3fea56d123c1146b5b14379 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
// Copyright (C) 2014-2020 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include <config.h>

#include <cryptolink.h>
#include <cryptolink/crypto_hash.h>

#include <boost/scoped_ptr.hpp>

#include <openssl/evp.h>

#include <cryptolink/openssl_common.h>
#define KEA_HASH
#include <cryptolink/openssl_compat.h>

#include <cstring>

namespace isc {
namespace cryptolink {

const EVP_MD*
ossl::getHashAlgorithm(HashAlgorithm algorithm) {
    switch (algorithm) {
    case isc::cryptolink::MD5:
        return (EVP_md5());
    case isc::cryptolink::SHA1:
        return (EVP_sha1());
    case isc::cryptolink::SHA256:
        return (EVP_sha256());
    case isc::cryptolink::SHA224:
        return (EVP_sha224());
    case isc::cryptolink::SHA384:
        return (EVP_sha384());
    case isc::cryptolink::SHA512:
        return (EVP_sha512());
    case isc::cryptolink::UNKNOWN_HASH:
        return (0);
    }
    // compiler should have prevented us to reach this, since we have
    // no default. But we need a return value anyway
    return (0);
}

/// \brief OpenSSL implementation of Hash. Each method is the counterpart
/// of the Hash corresponding method.
class HashImpl {
public:

    /// @brief Constructor for specific hash algorithm
    ///
    /// @param hash_algorithm The hash algorithm
    explicit HashImpl(const HashAlgorithm hash_algorithm)
    : hash_algorithm_(hash_algorithm), md_(0) {
        const EVP_MD* algo = ossl::getHashAlgorithm(hash_algorithm);
        if (algo == 0) {
            isc_throw(isc::cryptolink::UnsupportedAlgorithm,
                      "Unknown hash algorithm: " <<
                      static_cast<int>(hash_algorithm));
        }

        md_ = EVP_MD_CTX_new();
        if (md_ == 0) {
            isc_throw(isc::cryptolink::LibraryError,
                      "OpenSSL EVP_MD_CTX_new() failed");
        }

        EVP_DigestInit_ex(md_, algo, NULL);
    }

    /// @brief Destructor
    ~HashImpl() {
        if (md_) {
            EVP_MD_CTX_free(md_);
        }
        md_ = 0;
    }

    /// @brief Returns the HashAlgorithm of the object
    HashAlgorithm getHashAlgorithm() const {
        return (hash_algorithm_);
    }

    /// @brief Returns the output size of the digest
    ///
    /// @return output size of the digest
    size_t getOutputLength() const {
        return (EVP_MD_CTX_size(md_));
    }

    /// @brief Adds data to the digest
    ///
    /// See @ref isc::cryptolink::Hash::update() for details.
    void update(const void* data, const size_t len) {
        EVP_DigestUpdate(md_, data, len);
    }

    /// @brief Calculate the final digest
    ///
    /// See @ref isc::cryptolink::Hash::final() for details.
    void final(isc::util::OutputBuffer& result, size_t len) {
        size_t size = getOutputLength();
        std::vector<unsigned char> digest(size);
        EVP_DigestFinal_ex(md_, &digest[0], NULL);
        if (len > size) {
             len = size;
        }
        result.writeData(&digest[0], len);
    }

    /// @brief Calculate the final digest
    ///
    /// See @ref isc::cryptolink::Hash::final() for details.
    void final(void* result, size_t len) {
        size_t size = getOutputLength();
        std::vector<unsigned char> digest(size);
        EVP_DigestFinal_ex(md_, &digest[0], NULL);
        if (len > size) {
             len = size;
        }
        std::memcpy(result, &digest[0], len);
    }

    /// @brief Calculate the final digest
    ///
    /// See @ref isc::cryptolink::Hash::final() for details.
    std::vector<uint8_t> final(size_t len) {
        size_t size = getOutputLength();
        std::vector<unsigned char> digest(size);
        EVP_DigestFinal_ex(md_, &digest[0], NULL);
        if (len < size) {
            digest.resize(len);
        }
        return (std::vector<uint8_t>(digest.begin(), digest.end()));
    }

private:
    /// @brief The hash algorithm
    HashAlgorithm hash_algorithm_;

    /// @brief The pointer to the OpenSSL EVP_MD_CTX structure
    EVP_MD_CTX* md_;
};

Hash::Hash(const HashAlgorithm hash_algorithm)
{
    impl_ = new HashImpl(hash_algorithm);
}

Hash::~Hash() {
    delete impl_;
}

HashAlgorithm
Hash::getHashAlgorithm() const {
    return (impl_->getHashAlgorithm());
}

size_t
Hash::getOutputLength() const {
    return (impl_->getOutputLength());
}

void
Hash::update(const void* data, const size_t len) {
    impl_->update(data, len);
}

void
Hash::final(isc::util::OutputBuffer& result, size_t len) {
    impl_->final(result, len);
}

void
Hash::final(void* result, size_t len) {
    impl_->final(result, len);
}

std::vector<uint8_t>
Hash::final(size_t len) {
    return impl_->final(len);
}

} // namespace cryptolink
} // namespace isc