summaryrefslogtreecommitdiff
path: root/ext/openssl/ossl_digest.c
blob: 9f3d2697afd86b1ff17ffa1d8674e747a15479fb (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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/*
 * $Id$
 * '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'.)
 */
#include "ossl.h"

#define GetDigest(obj, ctx) do { \
    Data_Get_Struct((obj), EVP_MD_CTX, (ctx)); \
    if (!(ctx)) { \
	ossl_raise(rb_eRuntimeError, "Digest CTX wasn't initialized!"); \
    } \
} while (0)
#define SafeGetDigest(obj, ctx) do { \
    OSSL_Check_Kind((obj), cDigest); \
    GetDigest((obj), (ctx)); \
} while (0)

/*
 * Classes
 */
VALUE cDigest;
VALUE eDigestError;

static VALUE ossl_digest_alloc(VALUE klass);

/*
 * Public
 */
const EVP_MD *
GetDigestPtr(VALUE obj)
{
    const EVP_MD *md;

    if (TYPE(obj) == T_STRING) {
    	const char *name = StringValueCStr(obj);

        md = EVP_get_digestbyname(name);
        if (!md)
            ossl_raise(rb_eRuntimeError, "Unsupported digest algorithm (%s).", name);
    } else {
        EVP_MD_CTX *ctx;

        SafeGetDigest(obj, ctx);

        md = EVP_MD_CTX_md(ctx);
    }

    return md;
}

VALUE
ossl_digest_new(const EVP_MD *md)
{
    VALUE ret;
    EVP_MD_CTX *ctx;

    ret = ossl_digest_alloc(cDigest);
    GetDigest(ret, ctx);
    EVP_DigestInit_ex(ctx, md, NULL);

    return ret;
}

/*
 * Private
 */
static VALUE
ossl_digest_alloc(VALUE klass)
{
    EVP_MD_CTX *ctx;
    VALUE obj;

    ctx = EVP_MD_CTX_create();
    if (ctx == NULL)
	ossl_raise(rb_eRuntimeError, "EVP_MD_CTX_create() failed");
    obj = Data_Wrap_Struct(klass, 0, EVP_MD_CTX_destroy, ctx);

    return obj;
}

VALUE ossl_digest_update(VALUE, VALUE);

/*
 *  call-seq:
 *     Digest.new(string) -> digest
 *
 */
static VALUE
ossl_digest_initialize(int argc, VALUE *argv, VALUE self)
{
    EVP_MD_CTX *ctx;
    const EVP_MD *md;
    VALUE type, data;

    rb_scan_args(argc, argv, "11", &type, &data);
    md = GetDigestPtr(type);
    if (!NIL_P(data)) StringValue(data);

    GetDigest(self, ctx);
    EVP_DigestInit_ex(ctx, md, NULL);

    if (!NIL_P(data)) return ossl_digest_update(self, data);
    return self;
}

static VALUE
ossl_digest_copy(VALUE self, VALUE other)
{
    EVP_MD_CTX *ctx1, *ctx2;

    rb_check_frozen(self);
    if (self == other) return self;

    GetDigest(self, ctx1);
    SafeGetDigest(other, ctx2);

    if (!EVP_MD_CTX_copy(ctx1, ctx2)) {
	ossl_raise(eDigestError, NULL);
    }
    return self;
}

/*
 *  call-seq:
 *     digest.reset -> self
 *
 */
static VALUE
ossl_digest_reset(VALUE self)
{
    EVP_MD_CTX *ctx;

    GetDigest(self, ctx);
    EVP_DigestInit_ex(ctx, EVP_MD_CTX_md(ctx), NULL);

    return self;
}

/*
 *  call-seq:
 *     digest.update(string) -> aString
 *
 */
VALUE
ossl_digest_update(VALUE self, VALUE data)
{
    EVP_MD_CTX *ctx;

    StringValue(data);
    GetDigest(self, ctx);
    EVP_DigestUpdate(ctx, RSTRING_PTR(data), RSTRING_LEN(data));

    return self;
}

/*
 *  call-seq:
 *      digest.finish -> aString
 *
 */
static VALUE
ossl_digest_finish(int argc, VALUE *argv, VALUE self)
{
    EVP_MD_CTX *ctx;
    VALUE str;

    rb_scan_args(argc, argv, "01", &str);

    GetDigest(self, ctx);

    if (NIL_P(str)) {
        str = rb_str_new(NULL, EVP_MD_CTX_size(ctx));
    } else {
        StringValue(str);
        rb_str_resize(str, EVP_MD_CTX_size(ctx));
    }

    EVP_DigestFinal_ex(ctx, (unsigned char *)RSTRING_PTR(str), NULL);

    return str;
}

/*
 *  call-seq:
 *      digest.name -> string
 *
 */
static VALUE
ossl_digest_name(VALUE self)
{
    EVP_MD_CTX *ctx;

    GetDigest(self, ctx);

    return rb_str_new2(EVP_MD_name(EVP_MD_CTX_md(ctx)));
}

/*
 *  call-seq:
 *      digest.digest_size -> integer
 *
 *  Returns the output size of the digest.
 */
static VALUE
ossl_digest_size(VALUE self)
{
    EVP_MD_CTX *ctx;

    GetDigest(self, ctx);

    return INT2NUM(EVP_MD_CTX_size(ctx));
}

static VALUE
ossl_digest_block_length(VALUE self)
{
    EVP_MD_CTX *ctx;

    GetDigest(self, ctx);

    return INT2NUM(EVP_MD_CTX_block_size(ctx));
}

/*
 * INIT
 */
void
Init_ossl_digest()
{
    rb_require("digest");

#if 0
    mOSSL = rb_define_module("OpenSSL"); /* let rdoc know about mOSSL */
#endif

    /* Allows you to compute cryptographic hashes of arbitrary data. 
     */
    cDigest = rb_define_class_under(mOSSL, "Digest", rb_path2class("Digest::Class"));
    eDigestError = rb_define_class_under(cDigest, "DigestError", eOSSLError);

    rb_define_alloc_func(cDigest, ossl_digest_alloc);

    rb_define_method(cDigest, "initialize", ossl_digest_initialize, -1);
    rb_define_copy_func(cDigest, ossl_digest_copy);
    rb_define_method(cDigest, "reset", ossl_digest_reset, 0);
    rb_define_method(cDigest, "update", ossl_digest_update, 1);
    rb_define_alias(cDigest, "<<", "update");
    rb_define_private_method(cDigest, "finish", ossl_digest_finish, -1);
    rb_define_method(cDigest, "digest_length", ossl_digest_size, 0);
    rb_define_method(cDigest, "block_length", ossl_digest_block_length, 0);

    rb_define_method(cDigest, "name", ossl_digest_name, 0);
}