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Diffstat (limited to 'polarssl/src/library/x509write.c')
-rw-r--r--polarssl/src/library/x509write.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/polarssl/src/library/x509write.c b/polarssl/src/library/x509write.c
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+++ b/polarssl/src/library/x509write.c
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+/*
+ * X509 buffer writing functionality
+ *
+ * Copyright (C) 2006-2012, Brainspark B.V.
+ *
+ * This file is part of PolarSSL (http://www.polarssl.org)
+ * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "polarssl/config.h"
+
+#if defined(POLARSSL_X509_WRITE_C)
+
+#include "polarssl/asn1write.h"
+#include "polarssl/x509write.h"
+#include "polarssl/x509.h"
+#include "polarssl/sha1.h"
+#include "polarssl/sha2.h"
+#include "polarssl/sha4.h"
+#include "polarssl/md4.h"
+#include "polarssl/md5.h"
+
+int x509_write_pubkey_der( unsigned char *buf, size_t size, rsa_context *rsa )
+{
+ int ret;
+ unsigned char *c;
+ size_t len = 0;
+
+ c = buf + size - 1;
+
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
+
+ ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ if( c - buf < 1 )
+ return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--c = 0;
+ len += 1;
+
+ ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );
+
+ ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, buf, OID_PKCS1_RSA ) );
+
+ ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ return( len );
+}
+
+int x509_write_key_der( unsigned char *buf, size_t size, rsa_context *rsa )
+{
+ int ret;
+ unsigned char *c;
+ size_t len = 0;
+
+ c = buf + size - 1;
+
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->QP ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DQ ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DP ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->Q ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->P ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->D ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
+ ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
+ ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 0 ) );
+
+ ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ // TODO: Make NON RSA Specific variant later on
+/* *--c = 0;
+ len += 1;
+
+ len += asn1_write_len( &c, len);
+ len += asn1_write_tag( &c, ASN1_BIT_STRING );
+
+ len += asn1_write_oid( &c, OID_PKCS1_RSA );
+
+ len += asn1_write_int( &c, 0 );
+
+ len += asn1_write_len( &c, len);
+ len += asn1_write_tag( &c, ASN1_CONSTRUCTED | ASN1_SEQUENCE );*/
+
+/* for(i = 0; i < len; ++i)
+ {
+ if (i % 16 == 0 ) printf("\n");
+ printf("%02x ", c[i]);
+ }
+ printf("\n");*/
+
+ return( len );
+}
+
+int x509_write_name( unsigned char **p, unsigned char *start, char *oid,
+ char *name )
+{
+ int ret;
+ size_t string_len = 0;
+ size_t oid_len = 0;
+ size_t len = 0;
+
+ // Write PrintableString for all except OID_PKCS9_EMAIL
+ //
+ if( OID_SIZE( OID_PKCS9_EMAIL ) == strlen( oid ) &&
+ memcmp( oid, OID_PKCS9_EMAIL, strlen( oid ) ) == 0 )
+ {
+ ASN1_CHK_ADD( string_len, asn1_write_ia5_string( p, start, name ) );
+ }
+ else
+ ASN1_CHK_ADD( string_len, asn1_write_printable_string( p, start, name ) );
+
+ // Write OID
+ //
+ ASN1_CHK_ADD( oid_len, asn1_write_oid( p, start, oid ) );
+
+ len = oid_len + string_len;
+ ASN1_CHK_ADD( len, asn1_write_len( p, start, oid_len + string_len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SET ) );
+
+ return( len );
+}
+
+/*
+ * Wrapper for x509 hashes.
+ *
+ * \param out Buffer to receive the hash (Should be at least 64 bytes)
+ */
+static void x509_hash( const unsigned char *in, size_t len, int alg,
+ unsigned char *out )
+{
+ switch( alg )
+ {
+#if defined(POLARSSL_MD2_C)
+ case SIG_RSA_MD2 : md2( in, len, out ); break;
+#endif
+#if defined(POLARSSL_MD4_C)
+ case SIG_RSA_MD4 : md4( in, len, out ); break;
+#endif
+#if defined(POLARSSL_MD5_C)
+ case SIG_RSA_MD5 : md5( in, len, out ); break;
+#endif
+#if defined(POLARSSL_SHA1_C)
+ case SIG_RSA_SHA1 : sha1( in, len, out ); break;
+#endif
+#if defined(POLARSSL_SHA2_C)
+ case SIG_RSA_SHA224 : sha2( in, len, out, 1 ); break;
+ case SIG_RSA_SHA256 : sha2( in, len, out, 0 ); break;
+#endif
+#if defined(POLARSSL_SHA4_C)
+ case SIG_RSA_SHA384 : sha4( in, len, out, 1 ); break;
+ case SIG_RSA_SHA512 : sha4( in, len, out, 0 ); break;
+#endif
+ default:
+ memset( out, '\xFF', 64 );
+ break;
+ }
+}
+
+int x509_write_sig( unsigned char **p, unsigned char *start, char *oid,
+ unsigned char *sig, size_t size )
+{
+ int ret;
+ size_t len = 0;
+
+ if( *p - start < (int) size + 1 )
+ return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
+
+ len = size;
+ (*p) -= len;
+ memcpy( *p, sig, len );
+
+ *--(*p) = 0;
+ len += 1;
+
+ ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) );
+
+ // Write OID
+ //
+ ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid ) );
+
+ return( len );
+}
+
+int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa,
+ x509_req_name *req_name, int hash_id )
+{
+ int ret;
+ char sig_oid[10];
+ unsigned char *c, *c2;
+ unsigned char hash[64];
+ unsigned char sig[POLARSSL_MPI_MAX_SIZE];
+ unsigned char tmp_buf[2048];
+ size_t sub_len = 0, pub_len = 0, sig_len = 0;
+ size_t len = 0;
+ x509_req_name *cur = req_name;
+
+ c = tmp_buf + 2048 - 1;
+
+ ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, 0 ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_CONTEXT_SPECIFIC ) );
+
+ ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->E ) );
+ ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->N ) );
+
+ ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
+ ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ if( c - tmp_buf < 1 )
+ return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--c = 0;
+ pub_len += 1;
+
+ ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
+ ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_BIT_STRING ) );
+
+ ASN1_CHK_ADD( pub_len, asn1_write_algorithm_identifier( &c, tmp_buf, OID_PKCS1_RSA ) );
+
+ len += pub_len;
+ ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, pub_len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ while( cur != NULL )
+ {
+ ASN1_CHK_ADD( sub_len, x509_write_name( &c, tmp_buf, cur->oid, cur->name ) );
+
+ cur = cur->next;
+ }
+
+ len += sub_len;
+ ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, sub_len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ ASN1_CHK_ADD( len, asn1_write_int( &c, tmp_buf, 0 ) );
+
+ ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ x509_hash( c, len, hash_id, hash );
+
+ rsa_pkcs1_sign( rsa, NULL, NULL, RSA_PRIVATE, hash_id, 0, hash, sig );
+
+ // Generate correct OID
+ //
+ memcpy( sig_oid, OID_PKCS1, 8 );
+ sig_oid[8] = hash_id;
+ sig_oid[9] = '\0';
+
+ c2 = buf + size - 1;
+ ASN1_CHK_ADD( sig_len, x509_write_sig( &c2, buf, sig_oid, sig, rsa->len ) );
+
+ c2 -= len;
+ memcpy( c2, c, len );
+
+ len += sig_len;
+ ASN1_CHK_ADD( len, asn1_write_len( &c2, buf, len ) );
+ ASN1_CHK_ADD( len, asn1_write_tag( &c2, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
+
+ return( len );
+}
+
+#endif
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