1 /* $OpenBSD: pem_seal.c,v 1.24 2017/01/29 17:49:23 beck Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <string.h>
61
62 #include <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */
63
64 #ifndef OPENSSL_NO_RSA
65
66 #include <openssl/err.h>
67 #include <openssl/evp.h>
68 #include <openssl/objects.h>
69 #include <openssl/pem.h>
70 #include <openssl/rsa.h>
71 #include <openssl/x509.h>
72
73 static void
PEM_ENCODE_SEAL_CTX_cleanup(PEM_ENCODE_SEAL_CTX * ctx)74 PEM_ENCODE_SEAL_CTX_cleanup(PEM_ENCODE_SEAL_CTX *ctx)
75 {
76 EVP_CIPHER_CTX_cleanup(&ctx->cipher);
77 EVP_MD_CTX_cleanup(&ctx->md);
78 explicit_bzero(&ctx->encode, sizeof(ctx->encode));
79 }
80
81 int
PEM_SealInit(PEM_ENCODE_SEAL_CTX * ctx,EVP_CIPHER * type,EVP_MD * md_type,unsigned char ** ek,int * ekl,unsigned char * iv,EVP_PKEY ** pubk,int npubk)82 PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
83 unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk)
84 {
85 unsigned char key[EVP_MAX_KEY_LENGTH];
86 int ret = -1;
87 int i, j, max = 0;
88 char *s = NULL;
89
90 /*
91 * Make sure ctx is properly initialized so that we can always pass
92 * it to PEM_ENCODE_SEAL_CTX_cleanup() in the error path.
93 */
94 EVP_EncodeInit(&ctx->encode);
95 EVP_MD_CTX_init(&ctx->md);
96 EVP_CIPHER_CTX_init(&ctx->cipher);
97
98 for (i = 0; i < npubk; i++) {
99 if (pubk[i]->type != EVP_PKEY_RSA) {
100 PEMerror(PEM_R_PUBLIC_KEY_NO_RSA);
101 goto err;
102 }
103 j = RSA_size(pubk[i]->pkey.rsa);
104 if (j > max)
105 max = j;
106 }
107 s = reallocarray(NULL, max, 2);
108 if (s == NULL) {
109 PEMerror(ERR_R_MALLOC_FAILURE);
110 goto err;
111 }
112
113 if (!EVP_SignInit(&ctx->md, md_type))
114 goto err;
115
116 ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk);
117 if (ret <= 0)
118 goto err;
119
120 /* base64 encode the keys */
121 for (i = 0; i < npubk; i++) {
122 j = EVP_EncodeBlock((unsigned char *)s, ek[i],
123 RSA_size(pubk[i]->pkey.rsa));
124 ekl[i] = j;
125 memcpy(ek[i], s, j + 1);
126 }
127
128 ret = npubk;
129
130 if (0) {
131 err:
132 PEM_ENCODE_SEAL_CTX_cleanup(ctx);
133 }
134 free(s);
135 explicit_bzero(key, sizeof(key));
136 return (ret);
137 }
138
139 void
PEM_SealUpdate(PEM_ENCODE_SEAL_CTX * ctx,unsigned char * out,int * outl,unsigned char * in,int inl)140 PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
141 unsigned char *in, int inl)
142 {
143 unsigned char buffer[1600];
144 int i, j;
145
146 *outl = 0;
147 EVP_SignUpdate(&ctx->md, in, inl);
148 for (;;) {
149 if (inl <= 0)
150 break;
151 if (inl > 1200)
152 i = 1200;
153 else
154 i = inl;
155 EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i);
156 EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j);
157 *outl += j;
158 out += j;
159 in += i;
160 inl -= i;
161 }
162 }
163
164 int
PEM_SealFinal(PEM_ENCODE_SEAL_CTX * ctx,unsigned char * sig,int * sigl,unsigned char * out,int * outl,EVP_PKEY * priv)165 PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
166 unsigned char *out, int *outl, EVP_PKEY *priv)
167 {
168 unsigned char *s = NULL;
169 int ret = 0, j;
170 unsigned int i;
171
172 if (priv->type != EVP_PKEY_RSA) {
173 PEMerror(PEM_R_PUBLIC_KEY_NO_RSA);
174 goto err;
175 }
176 i = RSA_size(priv->pkey.rsa);
177 if (i < 100)
178 i = 100;
179 s = reallocarray(NULL, i, 2);
180 if (s == NULL) {
181 PEMerror(ERR_R_MALLOC_FAILURE);
182 goto err;
183 }
184
185 if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i))
186 goto err;
187 EVP_EncodeUpdate(&ctx->encode, out, &j, s, i);
188 *outl = j;
189 out += j;
190 EVP_EncodeFinal(&ctx->encode, out, &j);
191 *outl += j;
192
193 if (!EVP_SignFinal(&ctx->md, s, &i, priv))
194 goto err;
195 *sigl = EVP_EncodeBlock(sig, s, i);
196
197 ret = 1;
198
199 err:
200 PEM_ENCODE_SEAL_CTX_cleanup(ctx);
201 free(s);
202 return (ret);
203 }
204 #endif
205