171 lines
5.7 KiB
Plaintext
171 lines
5.7 KiB
Plaintext
From ssl-lists-owner@mincom.com Mon Sep 30 22:43:15 1996
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(5.65c/IDA-1.4.4 for eay); Mon, 30 Sep 1996 12:45:43 +1000
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(5.65c/IDA-1.4.4 for ssl-users@listserv.mincom.oz.au); Mon, 30 Sep 1996 12:43:16 +1000
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Date: Mon, 30 Sep 1996 12:43:15 +1000 (EST)
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From: Eric Young <eay@mincom.com>
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X-Sender: eay@orb
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To: Sampo Kellomaki <sampo@neuronio.pt>
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Cc: ssl-users@mincom.com, sampo@brutus.neuronio.pt
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Subject: Re: Signing with envelope routines
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In-Reply-To: <199609300037.BAA08729@brutus.neuronio.pt>
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Message-Id: <Pine.SOL.3.91.960930121504.11800Y-100000@orb>
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Mime-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Sender: ssl-lists-owner@mincom.com
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Precedence: bulk
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Status: O
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X-Status:
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On Mon, 30 Sep 1996, Sampo Kellomaki wrote:
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> I have been trying to figure out how to produce signatures with EVP_
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> routines. I seem to be able to read in private key and sign some
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> data ok, but I can't figure out how I am supposed to read in
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> public key so that I could verify my signature. I use self signed
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> certificate.
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hmm... a rather poorly documented are of the library at this point in time.
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> I figured I should use
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> EVP_PKEY* pkey = PEM_ASN1_read(d2i_PrivateKey, PEM_STRING_EVP_PKEY,
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> fp, NULL, NULL);
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> to read in private key and this seems to work Ok.
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>
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> However when I try analogous
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> EVP_PKEY* pkey = PEM_ASN1_read(d2i_PublicKey, PEM_STRING_X509,
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> fp, NULL, NULL);
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What you should do is
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X509 *x509=PEM_read_X509(fp,NULL,NULL);
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/* which is the same as PEM_ASN1_read(d2i_X509,PEM_STRING_X509,fp,
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* NULL,NULL); */
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Then
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EVP_PKEY *pkey=X509_extract_key(x509);
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There is also a X509_REQ_extract_key(req);
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which gets the public key from a certificate request.
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I re-worked quite a bit of this when I cleaned up the dependancy on
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RSA as the private key.
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> I figured that the second argument to PEM_ASN1_read should match the
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> name in my PEM encoded object, hence PEM_STRING_X509.
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> PEM_STRING_EVP_PKEY seems to be somehow magical
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> because it matches whatever private key there happens to be. I could
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> not find a similar constant to use with getting the certificate, however.
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:-), PEM_STRING_EVP_PKEY is 'magical' :-). In theory I should be using a
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standard such as PKCS#8 to store the private key so that the type is
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encoded in the asn.1 encoding of the object.
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> Is my approach of using PEM_ASN1_read correct? What should I pass in
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> as name? Can I use normal (or even self signed) X509 certificate for
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> verifying the signature?
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The actual public key is kept in the certificate, so basically you have
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to load the certificate and then 'unpack' the public key from the
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certificate.
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> When will SSLeay documentation be written ;-)? If I would contribute
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> comments to the code, would Eric take time to review them and include
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> them in distribution?
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:-) After SSLv3 and PKCS#7 :-). I actually started doing a function list
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but what I really need to do is do quite a few 'this is how you do xyz'
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type documents. I suppose the current method is to post to ssl-users and
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I'll respond :-).
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I'll add a 'demo' directory for the next release, I've appended a
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modified version of your program that works, you were very close :-).
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eric
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/* sign-it.cpp - Simple test app using SSLeay envelopes to sign data
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29.9.1996, Sampo Kellomaki <sampo@iki.fi> */
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/* converted to C - eay :-) */
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#include <stdio.h>
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#include "rsa.h"
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#include "evp.h"
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#include "objects.h"
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#include "x509.h"
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#include "err.h"
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#include "pem.h"
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#include "ssl.h"
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void main ()
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{
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int err;
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int sig_len;
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unsigned char sig_buf [4096];
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static char certfile[] = "plain-cert.pem";
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static char keyfile[] = "plain-key.pem";
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static char data[] = "I owe you...";
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EVP_MD_CTX md_ctx;
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EVP_PKEY * pkey;
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FILE * fp;
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X509 * x509;
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/* Just load the crypto library error strings,
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* SSL_load_error_strings() loads the crypto AND the SSL ones */
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/* SSL_load_error_strings();*/
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ERR_load_crypto_strings();
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/* Read private key */
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fp = fopen (keyfile, "r"); if (fp == NULL) exit (1);
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pkey = (EVP_PKEY*)PEM_ASN1_read ((char *(*)())d2i_PrivateKey,
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PEM_STRING_EVP_PKEY,
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fp,
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NULL, NULL);
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if (pkey == NULL) { ERR_print_errors_fp (stderr); exit (1); }
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fclose (fp);
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/* Do the signature */
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EVP_SignInit (&md_ctx, EVP_md5());
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EVP_SignUpdate (&md_ctx, data, strlen(data));
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sig_len = sizeof(sig_buf);
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err = EVP_SignFinal (&md_ctx,
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sig_buf,
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&sig_len,
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pkey);
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if (err != 1) { ERR_print_errors_fp (stderr); exit (1); }
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EVP_PKEY_free (pkey);
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/* Read public key */
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fp = fopen (certfile, "r"); if (fp == NULL) exit (1);
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x509 = (X509 *)PEM_ASN1_read ((char *(*)())d2i_X509,
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PEM_STRING_X509,
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fp, NULL, NULL);
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if (x509 == NULL) { ERR_print_errors_fp (stderr); exit (1); }
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fclose (fp);
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/* Get public key - eay */
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pkey=X509_extract_key(x509);
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if (pkey == NULL) { ERR_print_errors_fp (stderr); exit (1); }
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/* Verify the signature */
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EVP_VerifyInit (&md_ctx, EVP_md5());
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EVP_VerifyUpdate (&md_ctx, data, strlen((char*)data));
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err = EVP_VerifyFinal (&md_ctx,
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sig_buf,
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sig_len,
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pkey);
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if (err != 1) { ERR_print_errors_fp (stderr); exit (1); }
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EVP_PKEY_free (pkey);
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printf ("Signature Verified Ok.\n");
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}
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