159 lines
6.0 KiB
Plaintext
159 lines
6.0 KiB
Plaintext
From ssl-lists-owner@mincom.com Mon Sep 30 02:37:40 1996
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Received: (from sampo@localhost) by brutus.neuronio.pt (8.6.11/8.6.11) id BAA08729; Mon, 30 Sep 1996 01:37:40 +0100
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Date: Mon, 30 Sep 1996 01:37:40 +0100
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Message-Id: <199609300037.BAA08729@brutus.neuronio.pt>
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From: Sampo Kellomaki <sampo@neuronio.pt>
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To: ssl-users@mincom.com
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Cc: sampo@brutus.neuronio.pt
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Subject: Signing with envelope routines
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Sender: ssl-lists-owner@mincom.com
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Precedence: bulk
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Status: RO
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X-Status: D
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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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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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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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the program fails with
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error:0D09508D:asn1 encoding routines:D2I_PUBLICKEY:unknown public key type:d2i_pu.c:93
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error:0906700D:PEM routines:PEM_ASN1_read_bio:ASN1 lib:pem_lib.c:232
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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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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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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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I'm using SSLeay-0.6.4. My program is included below along with the
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key and cert that I use.
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--Sampo
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-----------------------------------
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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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#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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const char certfile[] = "plain-cert.pem";
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const char keyfile[] = "plain-key.pem";
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const 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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SSL_load_error_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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pkey = (EVP_PKEY*)PEM_ASN1_read ((char *(*)())d2i_PublicKey,
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PEM_STRING_X509,
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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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/* 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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/* EOF */
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--------------- plain-cert.pem -----------------
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-----BEGIN CERTIFICATE-----
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MIICLDCCAdYCAQAwDQYJKoZIhvcNAQEEBQAwgaAxCzAJBgNVBAYTAlBUMRMwEQYD
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VQQIEwpRdWVlbnNsYW5kMQ8wDQYDVQQHEwZMaXNib2ExFzAVBgNVBAoTDk5ldXJv
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bmlvLCBMZGEuMRgwFgYDVQQLEw9EZXNlbnZvbHZpbWVudG8xGzAZBgNVBAMTEmJy
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dXR1cy5uZXVyb25pby5wdDEbMBkGCSqGSIb3DQEJARYMc2FtcG9AaWtpLmZpMB4X
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DTk2MDkwNTAzNDI0M1oXDTk2MTAwNTAzNDI0M1owgaAxCzAJBgNVBAYTAlBUMRMw
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EQYDVQQIEwpRdWVlbnNsYW5kMQ8wDQYDVQQHEwZMaXNib2ExFzAVBgNVBAoTDk5l
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dXJvbmlvLCBMZGEuMRgwFgYDVQQLEw9EZXNlbnZvbHZpbWVudG8xGzAZBgNVBAMT
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EmJydXR1cy5uZXVyb25pby5wdDEbMBkGCSqGSIb3DQEJARYMc2FtcG9AaWtpLmZp
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MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAL7+aty3S1iBA/+yxjxv4q1MUTd1kjNw
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L4lYKbpzzlmC5beaQXeQ2RmGMTXU+mDvuqItjVHOK3DvPK7lTcSGftUCAwEAATAN
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BgkqhkiG9w0BAQQFAANBAFqPEKFjk6T6CKTHvaQeEAsX0/8YHPHqH/9AnhSjrwuX
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9EBc0n6bVGhN7XaXd6sJ7dym9sbsWxb+pJdurnkxjx4=
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-----END CERTIFICATE-----
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---------------- plain-key.pem -----------------
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-----BEGIN RSA PRIVATE KEY-----
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MIIBPAIBAAJBAL7+aty3S1iBA/+yxjxv4q1MUTd1kjNwL4lYKbpzzlmC5beaQXeQ
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2RmGMTXU+mDvuqItjVHOK3DvPK7lTcSGftUCAwEAAQJBALjkK+jc2+iihI98riEF
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oudmkNziSRTYjnwjx8mCoAjPWviB3c742eO3FG4/soi1jD9A5alihEOXfUzloenr
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8IECIQD3B5+0l+68BA/6d76iUNqAAV8djGTzvxnCxycnxPQydQIhAMXt4trUI3nc
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a+U8YL2HPFA3gmhBsSICbq2OptOCnM7hAiEA6Xi3JIQECob8YwkRj29DU3/4WYD7
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WLPgsQpwo1GuSpECICGsnWH5oaeD9t9jbFoSfhJvv0IZmxdcLpRcpslpeWBBAiEA
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6/5B8J0GHdJq89FHwEG/H2eVVUYu5y/aD6sgcm+0Avg=
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-----END RSA PRIVATE KEY-----
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------------------------------------------------
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