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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 | |
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