1 /* crypto/pem/pem_seal.c */
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 <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */
60 #ifndef OPENSSL_NO_RSA
61 #include <stdio.h>
62 #include "cryptlib.h"
63 #include <openssl/evp.h>
64 #include <openssl/rand.h>
65 #include <openssl/objects.h>
66 #include <openssl/x509.h>
67 #include <openssl/pem.h>
68 #include <openssl/rsa.h>
69
70 int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
71 unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk,
72 int npubk)
73 {
74 unsigned char key[EVP_MAX_KEY_LENGTH];
75 int ret= -1;
76 int i,j,max=0;
77 char *s=NULL;
78
79 for (i=0; i<npubk; i++)
80 {
81 if (pubk[i]->type != EVP_PKEY_RSA)
82 {
83 PEMerr(PEM_F_PEM_SEALINIT,PEM_R_PUBLIC_KEY_NO_RSA);
84 goto err;
85 }
86 j=RSA_size(pubk[i]->pkey.rsa);
87 if (j > max) max=j;
88 }
89 s=(char *)OPENSSL_malloc(max*2);
90 if (s == NULL)
91 {
92 PEMerr(PEM_F_PEM_SEALINIT,ERR_R_MALLOC_FAILURE);
93 goto err;
94 }
95
96 EVP_EncodeInit(&ctx->encode);
97
98 EVP_MD_CTX_init(&ctx->md);
99 if (!EVP_SignInit(&ctx->md,md_type))
100 goto err;
101
102 EVP_CIPHER_CTX_init(&ctx->cipher);
103 ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk);
104 if (ret <= 0) goto err;
105
106 /* base64 encode the keys */
107 for (i=0; i<npubk; i++)
108 {
109 j=EVP_EncodeBlock((unsigned char *)s,ek[i],
110 RSA_size(pubk[i]->pkey.rsa));
111 ekl[i]=j;
112 memcpy(ek[i],s,j+1);
113 }
114
115 ret=npubk;
116 err:
117 if (s != NULL) OPENSSL_free(s);
118 OPENSSL_cleanse(key,EVP_MAX_KEY_LENGTH);
119 return(ret);
120 }
121
122 void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
123 unsigned char *in, int inl)
124 {
125 unsigned char buffer[1600];
126 int i,j;
127
128 *outl=0;
129 EVP_SignUpdate(&ctx->md,in,inl);
130 for (;;)
131 {
132 if (inl <= 0) break;
133 if (inl > 1200)
134 i=1200;
135 else
136 i=inl;
137 EVP_EncryptUpdate(&ctx->cipher,buffer,&j,in,i);
138 EVP_EncodeUpdate(&ctx->encode,out,&j,buffer,j);
139 *outl+=j;
140 out+=j;
141 in+=i;
142 inl-=i;
143 }
144 }
145
146 int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
147 unsigned char *out, int *outl, EVP_PKEY *priv)
148 {
149 unsigned char *s=NULL;
150 int ret=0,j;
151 unsigned int i;
152
153 if (priv->type != EVP_PKEY_RSA)
154 {
155 PEMerr(PEM_F_PEM_SEALFINAL,PEM_R_PUBLIC_KEY_NO_RSA);
156 goto err;
157 }
158 i=RSA_size(priv->pkey.rsa);
159 if (i < 100) i=100;
160 s=(unsigned char *)OPENSSL_malloc(i*2);
161 if (s == NULL)
162 {
163 PEMerr(PEM_F_PEM_SEALFINAL,ERR_R_MALLOC_FAILURE);
164 goto err;
165 }
166
167 if (!EVP_EncryptFinal_ex(&ctx->cipher,s,(int *)&i))
168 goto err;
169 EVP_EncodeUpdate(&ctx->encode,out,&j,s,i);
170 *outl=j;
171 out+=j;
172 EVP_EncodeFinal(&ctx->encode,out,&j);
173 *outl+=j;
174
175 if (!EVP_SignFinal(&ctx->md,s,&i,priv)) goto err;
176 *sigl=EVP_EncodeBlock(sig,s,i);
177
178 ret=1;
179 err:
180 EVP_MD_CTX_cleanup(&ctx->md);
181 EVP_CIPHER_CTX_cleanup(&ctx->cipher);
182 if (s != NULL) OPENSSL_free(s);
183 return(ret);
184 }
185 #else /* !OPENSSL_NO_RSA */
186
187 # if PEDANTIC
188 static void *dummy=&dummy;
189 # endif
190
191 #endif