Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | EVP_SignInit(&ctx->md,md_type); |
| 100 | |
| 101 | EVP_CIPHER_CTX_init(&ctx->cipher); |
| 102 | ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk); |
| 103 | if (ret <= 0) goto err; |
| 104 | |
| 105 | /* base64 encode the keys */ |
| 106 | for (i=0; i<npubk; i++) |
| 107 | { |
| 108 | j=EVP_EncodeBlock((unsigned char *)s,ek[i], |
| 109 | RSA_size(pubk[i]->pkey.rsa)); |
| 110 | ekl[i]=j; |
| 111 | memcpy(ek[i],s,j+1); |
| 112 | } |
| 113 | |
| 114 | ret=npubk; |
| 115 | err: |
| 116 | if (s != NULL) OPENSSL_free(s); |
| 117 | OPENSSL_cleanse(key,EVP_MAX_KEY_LENGTH); |
| 118 | return(ret); |
| 119 | } |
| 120 | |
| 121 | void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl, |
| 122 | unsigned char *in, int inl) |
| 123 | { |
| 124 | unsigned char buffer[1600]; |
| 125 | int i,j; |
| 126 | |
| 127 | *outl=0; |
| 128 | EVP_SignUpdate(&ctx->md,in,inl); |
| 129 | for (;;) |
| 130 | { |
| 131 | if (inl <= 0) break; |
| 132 | if (inl > 1200) |
| 133 | i=1200; |
| 134 | else |
| 135 | i=inl; |
| 136 | EVP_EncryptUpdate(&ctx->cipher,buffer,&j,in,i); |
| 137 | EVP_EncodeUpdate(&ctx->encode,out,&j,buffer,j); |
| 138 | *outl+=j; |
| 139 | out+=j; |
| 140 | in+=i; |
| 141 | inl-=i; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl, |
| 146 | unsigned char *out, int *outl, EVP_PKEY *priv) |
| 147 | { |
| 148 | unsigned char *s=NULL; |
| 149 | int ret=0,j; |
| 150 | unsigned int i; |
| 151 | |
| 152 | if (priv->type != EVP_PKEY_RSA) |
| 153 | { |
| 154 | PEMerr(PEM_F_PEM_SEALFINAL,PEM_R_PUBLIC_KEY_NO_RSA); |
| 155 | goto err; |
| 156 | } |
| 157 | i=RSA_size(priv->pkey.rsa); |
| 158 | if (i < 100) i=100; |
| 159 | s=(unsigned char *)OPENSSL_malloc(i*2); |
| 160 | if (s == NULL) |
| 161 | { |
| 162 | PEMerr(PEM_F_PEM_SEALFINAL,ERR_R_MALLOC_FAILURE); |
| 163 | goto err; |
| 164 | } |
| 165 | |
| 166 | EVP_EncryptFinal_ex(&ctx->cipher,s,(int *)&i); |
| 167 | EVP_EncodeUpdate(&ctx->encode,out,&j,s,i); |
| 168 | *outl=j; |
| 169 | out+=j; |
| 170 | EVP_EncodeFinal(&ctx->encode,out,&j); |
| 171 | *outl+=j; |
| 172 | |
| 173 | if (!EVP_SignFinal(&ctx->md,s,&i,priv)) goto err; |
| 174 | *sigl=EVP_EncodeBlock(sig,s,i); |
| 175 | |
| 176 | ret=1; |
| 177 | err: |
| 178 | EVP_MD_CTX_cleanup(&ctx->md); |
| 179 | EVP_CIPHER_CTX_cleanup(&ctx->cipher); |
| 180 | if (s != NULL) OPENSSL_free(s); |
| 181 | return(ret); |
| 182 | } |
| 183 | #else /* !OPENSSL_NO_RSA */ |
| 184 | |
| 185 | # if PEDANTIC |
| 186 | static void *dummy=&dummy; |
| 187 | # endif |
| 188 | |
| 189 | #endif |