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+From ssl-lists-owner@mincom.com Mon Sep 30 22:43:15 1996
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+Date: Mon, 30 Sep 1996 12:43:15 +1000 (EST)
+From: Eric Young <eay@mincom.com>
+X-Sender: eay@orb
+To: Sampo Kellomaki <sampo@neuronio.pt>
+Cc: ssl-users@mincom.com, sampo@brutus.neuronio.pt
+Subject: Re: Signing with envelope routines
+In-Reply-To: <199609300037.BAA08729@brutus.neuronio.pt>
+Message-Id: <Pine.SOL.3.91.960930121504.11800Y-100000@orb>
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+
+
+On Mon, 30 Sep 1996, Sampo Kellomaki wrote:
+> 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.
+
+hmm... a rather poorly documented are of the library at this point in time.
+
+> 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);
+
+What you should do is
+ X509 *x509=PEM_read_X509(fp,NULL,NULL);
+ /* which is the same as PEM_ASN1_read(d2i_X509,PEM_STRING_X509,fp,
+ * NULL,NULL); */
+Then
+ EVP_PKEY *pkey=X509_extract_key(x509);
+
+There is also a X509_REQ_extract_key(req);
+which gets the public key from a certificate request.
+
+I re-worked quite a bit of this when I cleaned up the dependancy on
+RSA as the private key.
+
+> 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.
+
+:-), PEM_STRING_EVP_PKEY is 'magical' :-). In theory I should be using a
+standard such as PKCS#8 to store the private key so that the type is
+encoded in the asn.1 encoding of the object.
+
+> 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?
+
+The actual public key is kept in the certificate, so basically you have
+to load the certificate and then 'unpack' the public key from the
+certificate.
+
+> 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?
+
+:-) After SSLv3 and PKCS#7 :-). I actually started doing a function list
+but what I really need to do is do quite a few 'this is how you do xyz'
+type documents. I suppose the current method is to post to ssl-users and
+I'll respond :-).
+
+I'll add a 'demo' directory for the next release, I've appended a
+modified version of your program that works, you were very close :-).
+
+eric
+
+/* sign-it.cpp - Simple test app using SSLeay envelopes to sign data
+ 29.9.1996, Sampo Kellomaki <sampo@iki.fi> */
+
+/* converted to C - eay :-) */
+
+#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];
+ static char certfile[] = "plain-cert.pem";
+ static char keyfile[] = "plain-key.pem";
+ static char data[] = "I owe you...";
+ EVP_MD_CTX md_ctx;
+ EVP_PKEY * pkey;
+ FILE * fp;
+ X509 * x509;
+
+ /* Just load the crypto library error strings,
+ * SSL_load_error_strings() loads the crypto AND the SSL ones */
+ /* SSL_load_error_strings();*/
+ ERR_load_crypto_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);
+ x509 = (X509 *)PEM_ASN1_read ((char *(*)())d2i_X509,
+ PEM_STRING_X509,
+ fp, NULL, NULL);
+ if (x509 == NULL) { ERR_print_errors_fp (stderr); exit (1); }
+ fclose (fp);
+
+ /* Get public key - eay */
+ pkey=X509_extract_key(x509);
+ if (pkey == NULL) { ERR_print_errors_fp (stderr); exit (1); }
+
+ /* 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");
+}
+
+
+
+
+
projects / cassiopeia.git / blobdiff