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158 lines
6.0 KiB
158 lines
6.0 KiB
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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