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