1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/digest.h>
58
59#include <assert.h>
60#include <string.h>
61
62#include <openssl/err.h>
63#include <openssl/obj.h>
64#include <openssl/mem.h>
65
66#include "internal.h"
67
68
69int EVP_MD_type(const EVP_MD *md) { return md->type; }
70
71const char *EVP_MD_name(const EVP_MD *md) { return OBJ_nid2sn(md->type); }
72
73uint32_t EVP_MD_flags(const EVP_MD *md) { return md->flags; }
74
75size_t EVP_MD_size(const EVP_MD *md) { return md->md_size; }
76
77size_t EVP_MD_block_size(const EVP_MD *md) { return md->block_size; }
78
79
80void EVP_MD_CTX_init(EVP_MD_CTX *ctx) { memset(ctx, 0, sizeof(EVP_MD_CTX)); }
81
82EVP_MD_CTX *EVP_MD_CTX_create(void) {
83  EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof(EVP_MD_CTX));
84
85  if (ctx) {
86    EVP_MD_CTX_init(ctx);
87  }
88
89  return ctx;
90}
91
92int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) {
93  if (ctx->digest && ctx->digest->ctx_size && ctx->md_data) {
94    OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
95    OPENSSL_free(ctx->md_data);
96  }
97
98  assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
99  if (ctx->pctx_ops) {
100    ctx->pctx_ops->free(ctx->pctx);
101  }
102
103  EVP_MD_CTX_init(ctx);
104
105  return 1;
106}
107
108void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) {
109  if (!ctx) {
110    return;
111  }
112
113  EVP_MD_CTX_cleanup(ctx);
114  OPENSSL_free(ctx);
115}
116
117int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
118  uint8_t *tmp_buf = NULL;
119
120  if (in == NULL || in->digest == NULL) {
121    OPENSSL_PUT_ERROR(DIGEST, EVP_MD_CTX_copy_ex,
122                      DIGEST_R_INPUT_NOT_INITIALIZED);
123    return 0;
124  }
125
126  if (out->digest == in->digest) {
127    /* |md_data| will be the correct size in this case so it's removed from
128     * |out| at this point so that |EVP_MD_CTX_cleanup| doesn't free it and
129     * then it's reused. */
130    tmp_buf = out->md_data;
131    out->md_data = NULL;
132  }
133
134  EVP_MD_CTX_cleanup(out);
135  memcpy(out, in, sizeof(EVP_MD_CTX));
136
137  if (in->md_data && in->digest->ctx_size) {
138    if (tmp_buf) {
139      out->md_data = tmp_buf;
140    } else {
141      out->md_data = OPENSSL_malloc(in->digest->ctx_size);
142      if (!out->md_data) {
143        OPENSSL_PUT_ERROR(DIGEST, EVP_MD_CTX_copy_ex, ERR_R_MALLOC_FAILURE);
144        return 0;
145      }
146    }
147    memcpy(out->md_data, in->md_data, in->digest->ctx_size);
148  }
149
150  assert(in->pctx == NULL || in->pctx_ops != NULL);
151  if (in->pctx && in->pctx_ops) {
152    out->pctx = in->pctx_ops->dup(in->pctx);
153    if (!out->pctx) {
154      EVP_MD_CTX_cleanup(out);
155      return 0;
156    }
157  }
158
159  return 1;
160}
161
162int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
163  EVP_MD_CTX_init(out);
164  return EVP_MD_CTX_copy_ex(out, in);
165}
166
167int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *engine) {
168  if (ctx->digest != type) {
169    if (ctx->digest && ctx->digest->ctx_size) {
170      OPENSSL_free(ctx->md_data);
171    }
172    ctx->digest = type;
173    if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
174      ctx->update = type->update;
175      ctx->md_data = OPENSSL_malloc(type->ctx_size);
176      if (ctx->md_data == NULL) {
177        OPENSSL_PUT_ERROR(DIGEST, EVP_DigestInit_ex, ERR_R_MALLOC_FAILURE);
178        return 0;
179      }
180    }
181  }
182
183  assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
184  if (ctx->pctx_ops) {
185    if (!ctx->pctx_ops->begin_digest(ctx)) {
186      return 0;
187    }
188  }
189
190  if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) {
191    return 1;
192  }
193
194  return ctx->digest->init(ctx);
195}
196
197int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
198  EVP_MD_CTX_init(ctx);
199  return EVP_DigestInit_ex(ctx, type, NULL);
200}
201
202int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
203  return ctx->update(ctx, data, len);
204}
205
206int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, uint8_t *md_out, unsigned int *size) {
207  int ret;
208
209  assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
210  ret = ctx->digest->final(ctx, md_out);
211  if (size != NULL) {
212    *size = ctx->digest->md_size;
213  }
214  OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
215
216  return ret;
217}
218
219int EVP_DigestFinal(EVP_MD_CTX *ctx, uint8_t *md, unsigned int *size) {
220  int ret = EVP_DigestFinal_ex(ctx, md, size);
221  EVP_MD_CTX_cleanup(ctx);
222  return ret;
223}
224
225int EVP_Digest(const void *data, size_t count, uint8_t *out_md,
226               unsigned int *out_size, const EVP_MD *type, ENGINE *impl) {
227  EVP_MD_CTX ctx;
228  int ret;
229
230  EVP_MD_CTX_init(&ctx);
231  ret = EVP_DigestInit_ex(&ctx, type, impl) &&
232        EVP_DigestUpdate(&ctx, data, count) &&
233        EVP_DigestFinal_ex(&ctx, out_md, out_size);
234  EVP_MD_CTX_cleanup(&ctx);
235
236  return ret;
237}
238
239
240const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx) {
241  if (ctx == NULL) {
242    return NULL;
243  }
244  return ctx->digest;
245}
246
247unsigned EVP_MD_CTX_size(const EVP_MD_CTX *ctx) {
248  return EVP_MD_size(EVP_MD_CTX_md(ctx));
249}
250
251unsigned EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx) {
252  return EVP_MD_block_size(EVP_MD_CTX_md(ctx));
253}
254
255int EVP_MD_CTX_type(const EVP_MD_CTX *ctx) {
256  return EVP_MD_type(EVP_MD_CTX_md(ctx));
257}
258
259void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, uint32_t flags) {
260  ctx->flags |= flags;
261}
262
263void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, uint32_t flags) {
264  ctx->flags &= ~flags;
265}
266
267uint32_t EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, uint32_t flags) {
268  return ctx->flags & flags;
269}
270
271int EVP_add_digest(const EVP_MD *digest) {
272  return 1;
273}
274