ETSI STF525 / Internal Testing test suite This project provides an internal testing test suite and its associated Test Adapter/Codec

hmac.hh
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1
11 #pragma once
12
13 #include <vector>
14
15 #include <openssl/hmac.h>
16 #include <openssl/objects.h>
17
21 enum class hash_algorithms: unsigned char {
22 sha_256,
23 sha_384
24 }; // End of class hash_algorithms
25
26
31 class hmac {
32 HMAC_CTX _ctx;
33 hash_algorithms _hash_algorithms;
34 public:
40 hmac(const hash_algorithms p_hash_algorithms): _ctx{}, _hash_algorithms(p_hash_algorithms) { ::HMAC_CTX_init(&_ctx); };
44 virtual ~hmac() { ::HMAC_CTX_cleanup(&_ctx); };
45
55 inline int generate(const std::vector<unsigned char> p_buffer, const std::vector<unsigned char> p_secret_key, std::vector<unsigned char>& p_hmac) {
56 // Sanity check
57 if (p_buffer.size() == 0) {
58 return -1;
59 }
60
61 return generate(p_buffer.data(), p_buffer.size(), p_secret_key.data(), p_secret_key.size(), p_hmac);
62 };
63
75 inline int generate(const unsigned char *p_buffer, const size_t p_buffer_length, const unsigned char *p_secret_key, const size_t p_secret_key_length, std::vector<unsigned char>& p_hmac) {
76 // Sanity check
77 if ((p_buffer == nullptr) || (p_secret_key == nullptr)) {
78 return -1;
79 }
80
81 p_hmac.resize(EVP_MAX_MD_SIZE);
82 if (_hash_algorithms == hash_algorithms::sha_256) {
83 ::HMAC_Init_ex(&_ctx, (const void*)p_secret_key, (long unsigned int)p_secret_key_length, EVP_sha256(), NULL);
84 } else if (_hash_algorithms == hash_algorithms::sha_384) {
85 ::HMAC_Init_ex(&_ctx, (const void*)p_secret_key, (long unsigned int)p_secret_key_length, EVP_sha384(), NULL);
86 } else { // TODO To be continued
87 return -1;
88 }
89 // Compute the hash value
90 ::HMAC_Update(&_ctx, p_buffer, p_buffer_length);
91 unsigned int length = p_hmac.size();
92 ::HMAC_Final(&_ctx, static_cast<unsigned char*>(p_hmac.data()), &length);
93 // Resize the hmac
94 if (_hash_algorithms == hash_algorithms::sha_256) {
95 p_hmac.resize(16);
96 } // FIXME Check length for the other hash algorithm
97
98 return 0;
99 };
100 }; // End of class hmac
hmac::hmac
hmac(const hash_algorithms p_hash_algorithms)
Default constructor Create a new instance of the hmac class.
Definition: hmac.hh:40
hmac::_ctx
HMAC_CTX _ctx
Definition: hmac.hh:32
hash_algorithms
hash_algorithms
Definition: hmac.hh:21
hmac::generate
int generate(const std::vector< unsigned char > p_buffer, const std::vector< unsigned char > p_secret_key, std::vector< unsigned char > &p_hmac)
Generate the HMAC of data using a secret key [in] p_buffer The data tobe hashed.
Definition: hmac.hh:55
hmac
This class provides description of HMAC helper methods.
Definition: hmac.hh:31
hash_algorithms::sha_256
hmac::generate
int generate(const unsigned char *p_buffer, const size_t p_buffer_length, const unsigned char *p_secret_key, const size_t p_secret_key_length, std::vector< unsigned char > &p_hmac)
Generate the HMAC of data using a secret key.
Definition: hmac.hh:75
hmac::~hmac
virtual ~hmac()
Default destructor.
Definition: hmac.hh:44
hash_algorithms::sha_384
hmac::_hash_algorithms
hash_algorithms _hash_algorithms
HMAC context.
Definition: hmac.hh:33