summaryrefslogtreecommitdiff
path: root/ext/openssl/ossl_hmac.c
blob: 4ae04046e1c0572066b3a43d8329f866cd9887b5 (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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
/*
 * $Id$
 * 'OpenSSL for Ruby' project
 * Copyright (C) 2001-2002  Michal Rokos <m.rokos@sh.cvut.cz>
 * All rights reserved.
 */
/*
 * This program is licenced under the same licence as Ruby.
 * (See the file 'LICENCE'.)
 */
#if !defined(OPENSSL_NO_HMAC)

#include "ossl.h"

#define MakeHMAC(obj, klass, ctx) \
    obj = Data_Make_Struct(klass, HMAC_CTX, 0, ossl_hmac_free, ctx)
#define GetHMAC(obj, ctx) do { \
    Data_Get_Struct(obj, HMAC_CTX, ctx); \
    if (!ctx) { \
	ossl_raise(rb_eRuntimeError, "HMAC wasn't initialized"); \
    } \
} while (0)
#define SafeGetHMAC(obj, ctx) do { \
    OSSL_Check_Kind(obj, cHMAC); \
    GetHMAC(obj, ctx); \
} while (0)

/*
 * Classes
 */
VALUE cHMAC;
VALUE eHMACError;

/*
 * Public
 */

/*
 * Private
 */
static void
ossl_hmac_free(HMAC_CTX *ctx)
{
    HMAC_CTX_cleanup(ctx);
    free(ctx);
}

static VALUE
ossl_hmac_alloc(VALUE klass)
{
    HMAC_CTX *ctx;
    VALUE obj;

    MakeHMAC(obj, klass, ctx);
    HMAC_CTX_init(ctx);
	
    return obj;
}

static VALUE
ossl_hmac_initialize(VALUE self, VALUE key, VALUE digest)
{
    HMAC_CTX *ctx;

    StringValue(key);
    GetHMAC(self, ctx);
    HMAC_Init_ex(ctx, RSTRING_PTR(key), RSTRING_LEN(key),
		 GetDigestPtr(digest), NULL);

    return self;
}

static VALUE
ossl_hmac_copy(VALUE self, VALUE other)
{
    HMAC_CTX *ctx1, *ctx2;
    
    rb_check_frozen(self);
    if (self == other) return self;

    GetHMAC(self, ctx1);
    SafeGetHMAC(other, ctx2);

    if (!HMAC_CTX_copy(ctx1, ctx2)) {
	ossl_raise(eHMACError, NULL);
    }
    return self;
}

static VALUE
ossl_hmac_update(VALUE self, VALUE data)
{
    HMAC_CTX *ctx;

    StringValue(data);
    GetHMAC(self, ctx);
    HMAC_Update(ctx, RSTRING_PTR(data), RSTRING_LEN(data));

    return self;
}

static void
hmac_final(HMAC_CTX *ctx, char **buf, int *buf_len)
{
    HMAC_CTX final;

    if (!HMAC_CTX_copy(&final, ctx)) {
	ossl_raise(eHMACError, NULL);
    }
    if (!(*buf = OPENSSL_malloc(HMAC_size(&final)))) {
	HMAC_CTX_cleanup(&final);
	OSSL_Debug("Allocating %d mem", HMAC_size(&final));
	ossl_raise(eHMACError, "Cannot allocate memory for hmac");
    }
    HMAC_Final(&final, *buf, buf_len);
    HMAC_CTX_cleanup(&final);
}

static VALUE
ossl_hmac_digest(VALUE self)
{
    HMAC_CTX *ctx;
    char *buf;
    int buf_len;
    VALUE digest;
	
    GetHMAC(self, ctx);
    hmac_final(ctx, &buf, &buf_len);
    digest = ossl_buf2str(buf, buf_len);
    
    return digest;
}

static VALUE
ossl_hmac_hexdigest(VALUE self)
{
    HMAC_CTX *ctx;
    char *buf, *hexbuf;
    int buf_len;
    VALUE hexdigest;
	
    GetHMAC(self, ctx);
    hmac_final(ctx, &buf, &buf_len);
    if (string2hex(buf, buf_len, &hexbuf, NULL) != 2 * buf_len) {
	OPENSSL_free(buf);
	ossl_raise(eHMACError, "Memory alloc error");
    }
    OPENSSL_free(buf);
    hexdigest = ossl_buf2str(hexbuf, 2 * buf_len);

    return hexdigest;
}

static VALUE
ossl_hmac_s_digest(VALUE klass, VALUE digest, VALUE key, VALUE data)
{
    char *buf;
    int buf_len;
	
    StringValue(key);
    StringValue(data);
    buf = HMAC(GetDigestPtr(digest), RSTRING_PTR(key), RSTRING_LEN(key),
	       RSTRING_PTR(data), RSTRING_LEN(data), NULL, &buf_len);

    return rb_str_new(buf, buf_len);
}

static VALUE
ossl_hmac_s_hexdigest(VALUE klass, VALUE digest, VALUE key, VALUE data)
{
    char *buf, *hexbuf;
    int buf_len;
    VALUE hexdigest;

    StringValue(key);
    StringValue(data);
	
    buf = HMAC(GetDigestPtr(digest), RSTRING_PTR(key), RSTRING_LEN(key),
	       RSTRING_PTR(data), RSTRING_LEN(data), NULL, &buf_len);
    if (string2hex(buf, buf_len, &hexbuf, NULL) != 2 * buf_len) {
	ossl_raise(eHMACError, "Cannot convert buf to hexbuf");
    }
    hexdigest = ossl_buf2str(hexbuf, 2 * buf_len);

    return hexdigest;
}

/*
 * INIT
 */
void
Init_ossl_hmac()
{
    eHMACError = rb_define_class_under(mOSSL, "HMACError", eOSSLError);
	
    cHMAC = rb_define_class_under(mOSSL, "HMAC", rb_cObject);

    rb_define_alloc_func(cHMAC, ossl_hmac_alloc);
    rb_define_singleton_method(cHMAC, "digest", ossl_hmac_s_digest, 3);
    rb_define_singleton_method(cHMAC, "hexdigest", ossl_hmac_s_hexdigest, 3);
    
    rb_define_method(cHMAC, "initialize", ossl_hmac_initialize, 2);
    rb_define_copy_func(cHMAC, ossl_hmac_copy);

    rb_define_method(cHMAC, "update", ossl_hmac_update, 1);
    rb_define_alias(cHMAC, "<<", "update");
    rb_define_method(cHMAC, "digest", ossl_hmac_digest, 0);
    rb_define_method(cHMAC, "hexdigest", ossl_hmac_hexdigest, 0);
    rb_define_alias(cHMAC, "inspect", "hexdigest");
    rb_define_alias(cHMAC, "to_s", "hexdigest");
}

#else /* NO_HMAC */
#  warning >>> OpenSSL is compiled without HMAC support <<<
void
Init_ossl_hmac()
{
    rb_warning("HMAC will NOT be avaible: OpenSSL is compiled without HMAC.");
}
#endif /* NO_HMAC */