sig.txt

开源的ssl算法openssl,版本0.9.8H

From [e-mail] Mon Sep 30 02:37:40 1996
Received: from cygnus.mincom.oz.au by orb.mincom.oz.au with SMTP id AA11782
  (5.65c/IDA-1.4.4 for eay); Mon, 30 Sep 1996 11:46:21 +1000
Received: (from daemon@localhost) by cygnus.mincom.oz.au (8.7.5/8.7.3) id LAA18980 for ssl-users-outgoing; Mon, 30 Sep 1996 11:44:56 +1000 (EST)
Received: from minbne.mincom.oz.au (minbne.mincom.oz.au [192.55.196.247]) by cygnus.mincom.oz.au (8.7.5/8.7.3) with SMTP id LAA18962 for <[e-mail]>; Mon, 30 Sep 1996 11:44:51 +1000 (EST)
Received: by minbne.mincom.oz.au id AA22230
  (5.65c/IDA-1.4.4 for [e-mail]); Mon, 30 Sep 1996 11:38:41 +1000
Received: from brutus.neuronio.pt (brutus.neuronio.pt [193.126.253.2]) by bunyip.cc.uq.oz.au (8.7.6/8.7.3) with SMTP id LAA15824 for <[e-mail]>; Mon, 30 Sep 1996 11:40:07 +1000
Received: (from sampo@localhost) by brutus.neuronio.pt (8.6.11/8.6.11) id BAA08729; Mon, 30 Sep 1996 01:37:40 +0100
Date: Mon, 30 Sep 1996 01:37:40 +0100
Message-Id: <[e-mail]>
From: Sampo Kellomaki <[e-mail]>
To: [e-mail]
Cc: [e-mail]
Subject: Signing with envelope routines
Sender: [e-mail]
Precedence: bulk
Status: RO
X-Status: D


I have been trying to figure out how to produce signatures with EVP_
routines. I seem to be able to read in private key and sign some
data ok, but I can't figure out how I am supposed to read in
public key so that I could verify my signature. I use self signed
certificate.

I figured I should use
	EVP_PKEY* pkey = PEM_ASN1_read(d2i_PrivateKey, PEM_STRING_EVP_PKEY,
	                               fp, NULL, NULL);
to read in private key and this seems to work Ok.

However when I try analogous
	EVP_PKEY* pkey = PEM_ASN1_read(d2i_PublicKey, PEM_STRING_X509,
	                               fp, NULL, NULL);
the program fails with

error:0D09508D:asn1 encoding routines:D2I_PUBLICKEY:unknown public key type:d2i_pu.c:93
error:0906700D:PEM routines:PEM_ASN1_read_bio:ASN1 lib:pem_lib.c:232

I figured that the second argument to PEM_ASN1_read should match the
name in my PEM encoded object, hence PEM_STRING_X509.
PEM_STRING_EVP_PKEY seems to be somehow magical
because it matches whatever private key there happens to be. I could
not find a similar constant to use with getting the certificate, however.

Is my approach of using PEM_ASN1_read correct? What should I pass in
as name?  Can I use normal (or even self signed) X509 certificate for
verifying the signature?

When will SSLeay documentation be written ;-)? If I would contribute
comments to the code, would Eric take time to review them and include
them in distribution?

I'm using SSLeay-0.6.4. My program is included below along with the
key and cert that I use.

--Sampo

-----------------------------------
/* sign-it.cpp  -  Simple test app using SSLeay envelopes to sign data
   29.9.1996, Sampo Kellomaki <[e-mail]> */

#include <stdio.h>
#include "rsa.h"
#include "evp.h"
#include "objects.h"
#include "x509.h"
#include "err.h"
#include "pem.h"
#include "ssl.h"

void main ()
{
  int err;
  int sig_len;
  unsigned char sig_buf [4096];
  const char certfile[] = "plain-cert.pem";
  const char keyfile[]  = "plain-key.pem";
  const char data[]     = "I owe you...";
  EVP_MD_CTX     md_ctx;
  EVP_PKEY*      pkey;
  FILE*          fp;

  SSL_load_error_strings();
  
  /* Read private key */
  
  fp = fopen (keyfile, "r");   if (fp == NULL) exit (1);
  pkey = (EVP_PKEY*)PEM_ASN1_read ((char *(*)())d2i_PrivateKey,
				   PEM_STRING_EVP_PKEY,
				   fp,
				   NULL, NULL);
  if (pkey == NULL) {  ERR_print_errors_fp (stderr);    exit (1);  }
  fclose (fp);
  
  /* Do the signature */
  
  EVP_SignInit   (&md_ctx, EVP_md5());
  EVP_SignUpdate (&md_ctx, data, strlen(data));
  sig_len = sizeof(sig_buf);
  err = EVP_SignFinal (&md_ctx,
		       sig_buf, 
		       &sig_len,
		       pkey);
  if (err != 1) {  ERR_print_errors_fp (stderr);    exit (1);  }
  EVP_PKEY_free (pkey);
  
  /* Read public key */
  
  fp = fopen (certfile, "r");   if (fp == NULL) exit (1);
  pkey = (EVP_PKEY*)PEM_ASN1_read ((char *(*)())d2i_PublicKey,
				   PEM_STRING_X509,
				   fp,
				   NULL, NULL);
  if (pkey == NULL) {  ERR_print_errors_fp (stderr);    exit (1);  }
  fclose (fp);
  
  /* Verify the signature */
  
  EVP_VerifyInit   (&md_ctx, EVP_md5());
  EVP_VerifyUpdate (&md_ctx, data, strlen((char*)data));
  err = EVP_VerifyFinal (&md_ctx,
			 sig_buf,
			 sig_len,
			 pkey);
  if (err != 1) {  ERR_print_errors_fp (stderr);    exit (1);  }
  EVP_PKEY_free (pkey);
  printf ("Signature Verified Ok.\n");
}
/* EOF */
--------------- plain-cert.pem -----------------
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
---------------- plain-key.pem -----------------
-----BEGIN RSA PRIVATE KEY-----
MIIBPAIBAAJBAL7+aty3S1iBA/+yxjxv4q1MUTd1kjNwL4lYKbpzzlmC5beaQXeQ
2RmGMTXU+mDvuqItjVHOK3DvPK7lTcSGftUCAwEAAQJBALjkK+jc2+iihI98riEF
oudmkNziSRTYjnwjx8mCoAjPWviB3c742eO3FG4/soi1jD9A5alihEOXfUzloenr
8IECIQD3B5+0l+68BA/6d76iUNqAAV8djGTzvxnCxycnxPQydQIhAMXt4trUI3nc
a+U8YL2HPFA3gmhBsSICbq2OptOCnM7hAiEA6Xi3JIQECob8YwkRj29DU3/4WYD7
WLPgsQpwo1GuSpECICGsnWH5oaeD9t9jbFoSfhJvv0IZmxdcLpRcpslpeWBBAiEA
6/5B8J0GHdJq89FHwEG/H2eVVUYu5y/aD6sgcm+0Avg=
-----END RSA PRIVATE KEY-----
------------------------------------------------