1 /* Certificate creation. Demonstrates some certificate related 2 * operations. 3 */ 4 5 6 #include <stdio.h> 7 #include <stdlib.h> 8 9 #include <openssl/pem.h> 10 #include <openssl/conf.h> 11 #include <openssl/x509v3.h> 12 #ifndef OPENSSL_NO_ENGINE 13 #include <openssl/engine.h> 14 #endif 15 16 int mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days); 17 int add_ext(X509 *cert, int nid, char *value); 18 19 int main(int argc, char **argv) 20 { 21 BIO *bio_err; 22 X509 *x509=NULL; 23 EVP_PKEY *pkey=NULL; 24 25 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); 26 27 bio_err=BIO_new_fp(stderr, BIO_NOCLOSE); 28 29 mkcert(&x509,&pkey,512,0,365); 30 31 RSA_print_fp(stdout,pkey->pkey.rsa,0); 32 X509_print_fp(stdout,x509); 33 34 PEM_write_PrivateKey(stdout,pkey,NULL,NULL,0,NULL, NULL); 35 PEM_write_X509(stdout,x509); 36 37 X509_free(x509); 38 EVP_PKEY_free(pkey); 39 40 #ifndef OPENSSL_NO_ENGINE 41 ENGINE_cleanup(); 42 #endif 43 CRYPTO_cleanup_all_ex_data(); 44 45 CRYPTO_mem_leaks(bio_err); 46 BIO_free(bio_err); 47 return(0); 48 } 49 50 static void callback(int p, int n, void *arg) 51 { 52 char c='B'; 53 54 if (p == 0) c='.'; 55 if (p == 1) c='+'; 56 if (p == 2) c='*'; 57 if (p == 3) c='\n'; 58 fputc(c,stderr); 59 } 60 61 int mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int days) 62 { 63 X509 *x; 64 EVP_PKEY *pk; 65 RSA *rsa; 66 X509_NAME *name=NULL; 67 68 if ((pkeyp == NULL) || (*pkeyp == NULL)) 69 { 70 if ((pk=EVP_PKEY_new()) == NULL) 71 { 72 abort(); 73 return(0); 74 } 75 } 76 else 77 pk= *pkeyp; 78 79 if ((x509p == NULL) || (*x509p == NULL)) 80 { 81 if ((x=X509_new()) == NULL) 82 goto err; 83 } 84 else 85 x= *x509p; 86 87 rsa=RSA_generate_key(bits,RSA_F4,callback,NULL); 88 if (!EVP_PKEY_assign_RSA(pk,rsa)) 89 { 90 abort(); 91 goto err; 92 } 93 rsa=NULL; 94 95 X509_set_version(x,2); 96 ASN1_INTEGER_set(X509_get_serialNumber(x),serial); 97 X509_gmtime_adj(X509_get_notBefore(x),0); 98 X509_gmtime_adj(X509_get_notAfter(x),(long)60*60*24*days); 99 X509_set_pubkey(x,pk); 100 101 name=X509_get_subject_name(x); 102 103 /* This function creates and adds the entry, working out the 104 * correct string type and performing checks on its length. 105 * Normally we'd check the return value for errors... 106 */ 107 X509_NAME_add_entry_by_txt(name,"C", 108 MBSTRING_ASC, "UK", -1, -1, 0); 109 X509_NAME_add_entry_by_txt(name,"CN", 110 MBSTRING_ASC, "OpenSSL Group", -1, -1, 0); 111 112 /* Its self signed so set the issuer name to be the same as the 113 * subject. 114 */ 115 X509_set_issuer_name(x,name); 116 117 /* Add various extensions: standard extensions */ 118 add_ext(x, NID_basic_constraints, "critical,CA:TRUE"); 119 add_ext(x, NID_key_usage, "critical,keyCertSign,cRLSign"); 120 121 add_ext(x, NID_subject_key_identifier, "hash"); 122 123 /* Some Netscape specific extensions */ 124 add_ext(x, NID_netscape_cert_type, "sslCA"); 125 126 add_ext(x, NID_netscape_comment, "example comment extension"); 127 128 129 #ifdef CUSTOM_EXT 130 /* Maybe even add our own extension based on existing */ 131 { 132 int nid; 133 nid = OBJ_create("1.2.3.4", "MyAlias", "My Test Alias Extension"); 134 X509V3_EXT_add_alias(nid, NID_netscape_comment); 135 add_ext(x, nid, "example comment alias"); 136 } 137 #endif 138 139 if (!X509_sign(x,pk,EVP_sha1())) 140 goto err; 141 142 *x509p=x; 143 *pkeyp=pk; 144 return(1); 145 err: 146 return(0); 147 } 148 149 /* Add extension using V3 code: we can set the config file as NULL 150 * because we wont reference any other sections. 151 */ 152 153 int add_ext(X509 *cert, int nid, char *value) 154 { 155 X509_EXTENSION *ex; 156 X509V3_CTX ctx; 157 /* This sets the 'context' of the extensions. */ 158 /* No configuration database */ 159 X509V3_set_ctx_nodb(&ctx); 160 /* Issuer and subject certs: both the target since it is self signed, 161 * no request and no CRL 162 */ 163 X509V3_set_ctx(&ctx, cert, cert, NULL, NULL, 0); 164 ex = X509V3_EXT_conf_nid(NULL, &ctx, nid, value); 165 if (!ex) 166 return 0; 167 168 X509_add_ext(cert,ex,-1); 169 X509_EXTENSION_free(ex); 170 return 1; 171 } 172 173