hashcert.c

包含标准证书编/解码、哈希、MD5、SHA1等算法的实现源码

/*
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  permit persons to whom the Software or its derivatives is furnished 
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  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

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*/

#pragma ident "@(#)HashCert.C	1.22 96/01/29 Sun Microsystems"

#include <sys/types.h>
#include <netinet/in.h>
#include <time.h>
#include "Bstream.h"
#include "Bigint.h"
#include "ObjId.h"
#include "SkipCert.h"
#include "X509Cert.h"
#include "Sig.h"
#include "HashCert.h"

HashCert::HashCert(Bigint n_g, Bigint n_p, Bigint key, u_long validFrom, 
		   u_long validTo)
{
	CertType=SKIP_DH_PUBLIC;
	g=n_g;
	p=n_p;
	pubKey=key;
	notValidBefore=validFrom;
	notValidAfter=validTo;
	orig=encode();
}

HashCert::HashCert()
{
	CertType=SKIP_DH_PUBLIC;
	Bigint x("0");
	g=p=pubKey=x;
	notValidBefore=notValidAfter=0;
	validated=0;	
}

int HashCert::decode(Bstream cert)
{
	u_short primelen;
	u_short genlen;
	u_short publen;
	u_char *buf;

	CertType=SKIP_DH_PUBLIC;
	validated = 0;
	orig=cert;

	buf=cert.getdatap();

	memcpy(&notValidBefore, buf, 4);
	notValidBefore=ntohl(notValidBefore);
	buf+=4;

	memcpy(&notValidAfter, buf, 4);
	notValidAfter=ntohl(notValidAfter);
	buf+=4;

	memcpy(&primelen,buf, 2);
	primelen=ntohs(primelen);
	buf+=2;
	p=Bigint(buf, primelen);
	buf+=primelen;

	memcpy(&genlen,buf, 2);
	genlen=ntohs(genlen);
	buf+=2;
	g=Bigint(buf, genlen);
	buf+=genlen;

	memcpy(&publen, buf, 2);
	publen=ntohs(publen);
	buf+=2;
	pubKey=Bigint(buf, publen);
	return 0;
}

int HashCert::isValid(Bstream hash)
{
	Bstream name;
	if (NTPNOW < notValidBefore ||  NTPNOW > notValidAfter ) {
		return 2;
	}

	name=MD5(encode());	
	if (hash.getlength() != 0 && hash != name) 
		return 0;
	validated=1;
	return 1;
}

Bstream HashCert::encode()
{
	Bstream cert;
	u_short length;
	Bstream nullstr;
	Bstream temp;

	if (CertType != SKIP_DH_PUBLIC)  // Uninitialized
		return nullstr;

	cert = Bstream(4, (u_char *)&notValidBefore);
	cert += Bstream(4, (u_char *)&notValidAfter);


	temp = Bigint_to_Bstr(p);
	length=htons((u_short)temp.getlength());
	cert += Bstream(2, (u_char *)&length);
	cert += temp;

	temp = Bigint_to_Bstr(g);
	length=htons((u_short)temp.getlength());
	cert += Bstream(2, (u_char *)&length);
	cert += temp;


	temp = Bigint_to_Bstr(pubKey);
	length=htons((u_short)temp.getlength());
	cert += Bstream(2, (u_char *)&length);
	cert += temp;

	return cert;
}


HashCert::skip_params (Bigint &newg, Bigint &newp)
{
	if (CertType != SKIP_DH_PUBLIC)  // Uninitialized
		return 1;
	newg=g;
	newp=p;
	return 0;
}

Bigint HashCert::skip_pubkey()
{
	if (CertType != SKIP_DH_PUBLIC)  // Uninitialized
		return Bigint((short)0);
	return pubKey;
}

Bstream HashCert::skip_name()
{
	Bstream nullstr;
	if (CertType != SKIP_DH_PUBLIC)  // Uninitialized
		return nullstr;
	return MD5(encode());
}

u_long HashCert::skip_notvalidafter() {
	if (CertType != SKIP_DH_PUBLIC)  // Uninitialized
		return 0;
	return notValidAfter;
}

u_long HashCert::skip_notvalidbefore() {
	if (CertType != SKIP_DH_PUBLIC)  // Uninitialized
		return 0;
	return notValidBefore;
}

void HashCert::print()
{
	time_t temp;
	printf("Format: Hashed Public Key (MD5)\n");
	printf("Name/Hash: ");
	skip_name().print();
	temp=notValidBefore-UNIXSTART;
	printf("Not valid Before: %s", ctime(&temp));
	temp=notValidAfter-UNIXSTART;
	printf("Not valid After: %s", ctime(&temp));
	printf("g: "); g.print();
	printf("\n");
	printf("p: "); p.print();
	printf("\n");
	printf("public key: "); pubKey.print();
	printf("\n");
}