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From ssl-lists-owner@mincom.com Mon Sep 30 02:37:40 1996
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Date: Mon, 30 Sep 1996 01:37:40 +0100
Message-Id: <199609300037.BAA08729@brutus.neuronio.pt>
From: Sampo Kellomaki <sampo@neuronio.pt>
To: ssl-users@mincom.com
Cc: sampo@brutus.neuronio.pt
Subject: Signing with envelope routines
Sender: ssl-lists-owner@mincom.com
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 <sampo@iki.fi> */
#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-----
------------------------------------------------