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- x509_write_cert_req() now supports all available hash functions

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This commit is contained in:
Paul Bakker 2012-02-16 14:08:06 +00:00
parent 89f3fc5bf1
commit 3cac5e012b
2 changed files with 55 additions and 7 deletions
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2
include/polarssl/x509write.h
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@ -41,6 +41,6 @@ x509_req_name;
int x509_write_pubkey_der( unsigned char *buf, size_t size, rsa_context *rsa ); int x509_write_pubkey_der( unsigned char *buf, size_t size, rsa_context *rsa );
int x509_write_key_der( unsigned char *buf, size_t size, rsa_context *rsa ); int x509_write_key_der( unsigned char *buf, size_t size, rsa_context *rsa );
int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa, int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa,
x509_req_name *req_name ); x509_req_name *req_name, int hash_id );
#endif /* POLARSSL_X509_WRITE_H */ #endif /* POLARSSL_X509_WRITE_H */

60
library/x509write.c
View File

@ -31,6 +31,10 @@
#include "polarssl/x509write.h" #include "polarssl/x509write.h"
#include "polarssl/x509.h" #include "polarssl/x509.h"
#include "polarssl/sha1.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 x509_write_pubkey_der( unsigned char *buf, size_t size, rsa_context *rsa )
{ {
@ -140,6 +144,42 @@ int x509_write_name( unsigned char **p, unsigned char *start, char *oid,
return( len ); 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, int x509_write_sig( unsigned char **p, unsigned char *start, char *oid,
unsigned char *sig, size_t size ) unsigned char *sig, size_t size )
{ {
@ -167,12 +207,13 @@ int x509_write_sig( unsigned char **p, unsigned char *start, char *oid,
} }
int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa, int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa,
x509_req_name *req_name ) x509_req_name *req_name, int hash_id )
{ {
int ret; int ret;
char sig_oid[10];
unsigned char *c, *c2; unsigned char *c, *c2;
unsigned char hash[20]; unsigned char hash[64];
unsigned char sig[512]; unsigned char sig[POLARSSL_MPI_MAX_SIZE];
unsigned char tmp_buf[2048]; unsigned char tmp_buf[2048];
size_t sub_len = 0, pub_len = 0, sig_len = 0; size_t sub_len = 0, pub_len = 0, sig_len = 0;
size_t len = 0; size_t len = 0;
@ -220,11 +261,18 @@ int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa,
ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) ); 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 ) ); ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
sha1( c, len, hash ); x509_hash( c, len, hash_id, hash );
rsa_pkcs1_sign( rsa, NULL, NULL, RSA_PRIVATE, SIG_RSA_SHA1, 0, hash, sig );
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; c2 = buf + size - 1;
ASN1_CHK_ADD( sig_len, x509_write_sig( &c2, buf, OID_PKCS1_SHA1, sig, rsa->len ) ); ASN1_CHK_ADD( sig_len, x509_write_sig( &c2, buf, sig_oid, sig, rsa->len ) );
c2 -= len; c2 -= len;
memcpy( c2, c, len ); memcpy( c2, c, len );