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
71uint32_t EVP_MD_flags(const EVP_MD *md) { return md->flags; }
72
73size_t EVP_MD_size(const EVP_MD *md) { return md->md_size; }
74
75size_t EVP_MD_block_size(const EVP_MD *md) { return md->block_size; }
76
77
78void EVP_MD_CTX_init(EVP_MD_CTX *ctx) { memset(ctx, 0, sizeof(EVP_MD_CTX)); }
79
80EVP_MD_CTX *EVP_MD_CTX_create(void) {
81  EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof(EVP_MD_CTX));
82
83  if (ctx) {
84    EVP_MD_CTX_init(ctx);
85  }
86
87  return ctx;
88}
89
90int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) {
91  if (ctx->digest && ctx->digest->ctx_size && ctx->md_data) {
92    OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
93    OPENSSL_free(ctx->md_data);
94  }
95
96  assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
97  if (ctx->pctx_ops) {
98    ctx->pctx_ops->free(ctx->pctx);
99  }
100
101  EVP_MD_CTX_init(ctx);
102
103  return 1;
104}
105
106void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) {
107  if (!ctx) {
108    return;
109  }
110
111  EVP_MD_CTX_cleanup(ctx);
112  OPENSSL_free(ctx);
113}
114
115int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
116  uint8_t *tmp_buf = NULL;
117
118  if (in == NULL || in->digest == NULL) {
119    OPENSSL_PUT_ERROR(DIGEST, EVP_MD_CTX_copy_ex,
120                      DIGEST_R_INPUT_NOT_INITIALIZED);
121    return 0;
122  }
123
124  if (out->digest == in->digest) {
125    /* |md_data| will be the correct size in this case so it's removed from
126     * |out| at this point so that |EVP_MD_CTX_cleanup| doesn't free it and
127     * then it's reused. */
128    tmp_buf = out->md_data;
129    out->md_data = NULL;
130  }
131
132  EVP_MD_CTX_cleanup(out);
133  memcpy(out, in, sizeof(EVP_MD_CTX));
134
135  if (in->md_data && in->digest->ctx_size) {
136    if (tmp_buf) {
137      out->md_data = tmp_buf;
138    } else {
139      out->md_data = OPENSSL_malloc(in->digest->ctx_size);
140      if (!out->md_data) {
141        OPENSSL_PUT_ERROR(DIGEST, EVP_MD_CTX_copy_ex, ERR_R_MALLOC_FAILURE);
142        return 0;
143      }
144    }
145    memcpy(out->md_data, in->md_data, in->digest->ctx_size);
146  }
147
148  assert(in->pctx == NULL || in->pctx_ops != NULL);
149  if (in->pctx && in->pctx_ops) {
150    out->pctx = in->pctx_ops->dup(in->pctx);
151    if (!out->pctx) {
152      EVP_MD_CTX_cleanup(out);
153      return 0;
154    }
155  }
156
157  return 1;
158}
159
160int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
161  EVP_MD_CTX_init(out);
162  return EVP_MD_CTX_copy_ex(out, in);
163}
164
165int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *engine) {
166  if (ctx->digest != type) {
167    if (ctx->digest && ctx->digest->ctx_size) {
168      OPENSSL_free(ctx->md_data);
169    }
170    ctx->digest = type;
171    if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
172      ctx->update = type->update;
173      ctx->md_data = OPENSSL_malloc(type->ctx_size);
174      if (ctx->md_data == NULL) {
175        OPENSSL_PUT_ERROR(DIGEST, EVP_DigestInit_ex, ERR_R_MALLOC_FAILURE);
176        return 0;
177      }
178    }
179  }
180
181  assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
182  if (ctx->pctx_ops) {
183    if (!ctx->pctx_ops->begin_digest(ctx)) {
184      return 0;
185    }
186  }
187
188  if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) {
189    return 1;
190  }
191
192  ctx->digest->init(ctx);
193  return 1;
194}
195
196int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
197  EVP_MD_CTX_init(ctx);
198  return EVP_DigestInit_ex(ctx, type, NULL);
199}
200
201int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
202  ctx->update(ctx, data, len);
203  return 1;
204}
205
206int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, uint8_t *md_out, unsigned int *size) {
207  assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
208  ctx->digest->final(ctx, md_out);
209  if (size != NULL) {
210    *size = ctx->digest->md_size;
211  }
212  OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
213  return 1;
214}
215
216int EVP_DigestFinal(EVP_MD_CTX *ctx, uint8_t *md, unsigned int *size) {
217  EVP_DigestFinal_ex(ctx, md, size);
218  EVP_MD_CTX_cleanup(ctx);
219  return 1;
220}
221
222int EVP_Digest(const void *data, size_t count, uint8_t *out_md,
223               unsigned int *out_size, const EVP_MD *type, ENGINE *impl) {
224  EVP_MD_CTX ctx;
225  int ret;
226
227  EVP_MD_CTX_init(&ctx);
228  ret = EVP_DigestInit_ex(&ctx, type, impl) &&
229        EVP_DigestUpdate(&ctx, data, count) &&
230        EVP_DigestFinal_ex(&ctx, out_md, out_size);
231  EVP_MD_CTX_cleanup(&ctx);
232
233  return ret;
234}
235
236
237const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx) {
238  if (ctx == NULL) {
239    return NULL;
240  }
241  return ctx->digest;
242}
243
244unsigned EVP_MD_CTX_size(const EVP_MD_CTX *ctx) {
245  return EVP_MD_size(EVP_MD_CTX_md(ctx));
246}
247
248unsigned EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx) {
249  return EVP_MD_block_size(EVP_MD_CTX_md(ctx));
250}
251
252int EVP_MD_CTX_type(const EVP_MD_CTX *ctx) {
253  return EVP_MD_type(EVP_MD_CTX_md(ctx));
254}
255
256void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, uint32_t flags) {
257  ctx->flags |= flags;
258}
259
260int EVP_add_digest(const EVP_MD *digest) {
261  return 1;
262}
263