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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Title" content="Example: Signing a file with your Cryptographic Coprocessor" />
<meta name="abstract" content="Change this program example to suit your needs for signing a file with your Cryptographic Coprocessor." />
<meta name="description" content="Change this program example to suit your needs for signing a file with your Cryptographic Coprocessor." />
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<title>Example: Signing a file with your Cryptographic Coprocessor</title>
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<h1 class="topictitle1">Example: Signing a file with your Cryptographic Coprocessor</h1>
<div><p>Change this program example to suit your needs for signing a file
with your Cryptographic Coprocessor.</p>
<div class="section"><div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm#codedisclaimer">Code license and disclaimer information</a> for
important legal information.<p>If you choose to use this program example,
change it to suit your specific needs. For security reasons, IBM<sup>®</sup> recommends
that you individualize these program examples rather than using the default
values provided.</p>
</div>
</div>
<div class="example"> <pre>/*---------------------------------------------------------------*/
/* Description: Digitally signs a streams file. */
/* */
/* COPYRIGHT 5769-SS1 (c) IBM Corp 1999 */
/* */
/* This material contains programming source code for your */
/* consideration. These examples have not been thoroughly */
/* tested under all conditions. IBM, therefore, cannot */
/* guarantee or imply reliability, serviceability, or function */
/* of these programs. All programs contained herein are */
/* provided to you "AS IS". THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
/* EXPRESSLY DISCLAIMED. IBM provides no program services for */
/* these programs and files. */
/* */
/* Parameters: File to be signed */
/* File to contain signature */
/* Key label of key to use */
/* */
/* Examples: */
/* CALL PGM(SIGNFILE) PARM('file_to_sign' 'file_to_hold_sign' */
/* 'key_label'); */
/* */
/* Note: The CCA verbs used in the this program are more fully */
/* described in the IBM CCA Basic Services Reference */
/* and Guide (SC31-8609) publication. */
/* */
/* Note: This program assumes the card you want to use is */
/* already identified either by defaulting to the CRP01 */
/* device or has been explicitly named using the */
/* Cryptographic_Resource_Allocate verb. Also this */
/* device must be varied on and you must be authorized */
/* to use this device description. */
/* */
/* Use the following commands to compile this program: */
/* ADDLIBLE LIB(QCCA) */
/* CRTCMOD MODULE(SIGNFILE) SRCFILE(SAMPLE) SYSIFCOPT(*IFSIO) */
/* CRTPGM PGM(SIGNFILE) MODULE(SIGNFILE) */
/* BNDSRVPGM(QCCA/CSNDDSG QCCA/CSNBOWH) */
/* */
/* Note: authority to the CSNDDSG and CSNBOWH service programs */
/* in the QCCA library is assumed. */
/* */
/* Common Cryptographic Architecture (CCA) verbs used: */
/* Digital_Signature_Generate (CSNDDSG) */
/* One_Way_Hash (CSNBOWH) */
/*---------------------------------------------------------------*/
#include &lt;stdlib.h&gt;
#include &lt;stdio.h&gt;
#include &lt;string.h&gt;
#include "csucincl.h" /* header file for CCA Cryptographic
Service Provider */
/*-----------------------------------------------------------*/
/* standard return codes */
/*-----------------------------------------------------------*/
#define ERROR -1
#define OK 0
int hash_file(long h_len, char h_out[128], FILE *t_in);
int main(int argc, char *argv[])
{
/*-----------------------------------------------------------*/
/* standard CCA parameters */
/*-----------------------------------------------------------*/
long return_code;
long reason_code;
long exit_data_length = 0L;
char exit_data[2];
long rule_array_count = 0L;
char rule_array[1][8];
/*-----------------------------------------------------------*/
/* parameters unique to this sample program */
/*-----------------------------------------------------------*/
long PKA_private_key_identifier_length = 64;
char PKA_private_key_identifier[64];
long hash_length = 16L;
char hash[128];
long signature_field_length = 128L;
long signature_bit_length = 0L;
char signature_field[256];
char key_label[64];
long key_token_length = 2500L;
char key_token[2500];
FILE *file2sign;
FILE *signature;
int hash_return;
if (argc &lt; 2)
{
printf("Name of file to be signed is missing.");
return ERROR;
}
else if (argc &lt; 3)
{
printf("Name of file where the signature should ");
printf("be written is missing.");
return ERROR;
}
else if (argc &lt; 4)
{
printf("Key label for the key to be used for signing is missing.");
return ERROR;
}
if ( (strlen(argv[3])) &gt; 64 )
{
printf("Invalid Key Label. Key label longer than 64.");
return ERROR;
}
else
{
memset(PKA_private_key_identifier, ' ', 64);
memcpy(PKA_private_key_identifier, argv[3],strlen(argv[3]));
}
/* Open the file that is being signed. */
if ( (file2sign = fopen(argv[1],"rb")) == NULL)
{
printf("Opening of file %s failed.",argv[1]);
return ERROR;
}
/* Obtain a hash value for the file. */
hash_return = hash_file(hash_length, hash, file2sign);
/* Close the file. */
fclose(file2sign);
if (hash_return != OK)
{
printf("Signature generation failed due to hash error.\n");
}
else
{
/* Use CSNDDSG to generate the signature. */
CSNDDSG(&amp;return_code,
&amp;reason_code,
&amp;exit_data_length,
exit_data,
&amp;rule_array_count,
(char *) rule_array,
&amp;PKA_private_key_identifier_length,
PKA_private_key_identifier,
&amp;hash_length,
hash,
&amp;signature_field_length,
&amp;signature_bit_length,
signature_field);
}
if (return_code != 0)
{
printf("Signature generation failed with return/reason code %ld/%ld",
return_code, reason_code);
return ERROR;
}
else
{
printf("Signature generation was successful.");
printf("Return/Reason codes = %ld/%ld\n", return_code, reason_code);
printf("Signature has length = %ld\n",signature_field_length);
signature = fopen(argv[2],"wb");
if (signature == NULL)
{
printf("Open of file %s failed.",argv[2]);
printf("Signature was not saved.");
return ERROR;
}
fwrite(signature_field, 1, signature_field_length, signature);
fclose(signature);
printf("Signature was saved successfully in %s.", argv[2]);
return OK;
}
}
int hash_file(long h_len, char h_out[128], FILE *t_in)
{
/*-----------------------------------------------------------*/
/* standard CCA parameters */
/*-----------------------------------------------------------*/
long return_code;
long reason_code;
long exit_data_length = 0;
char exit_data[2];
long rule_array_count = 2;
char rule_array[2][8];
/*-----------------------------------------------------------*/
/* parameters unique to this function */
/*-----------------------------------------------------------*/
long text_length;
char text[1024];
long chaining_vector_length = 128;
char chaining_vector[128];
long file_length;
fseek(t_in, 0, SEEK_END);
file_length = ftell(t_in);
rewind(t_in);
text_length = fread(text, 1, 1024, t_in);
memcpy(rule_array[0], "MD5 ", 8);
if (file_length &lt;= 1024) {
memcpy(rule_array[1], "ONLY ", 8);
}
else {
memcpy(rule_array[1], "FIRST ", 8);
}
while (file_length &gt; 0)
{
CSNBOWH(&amp;return_code,
&amp;reason_code,
&amp;exit_data_length,
exit_data,
&amp;rule_array_count,
(char *) rule_array,
&amp;text_length,
text,
&amp;chaining_vector_length,
chaining_vector,
&amp;h_len,
h_out);
if (return_code != 0)
break;
printf("Hash iteration worked.\n");
file_length -= text_length;
if (file_length &gt; 0)
{
text_length = fread(text, 1, 1024, t_in);
if (file_length &lt;= 1024) {
memcpy(rule_array[1], "LAST ", 8);
}
else {
memcpy(rule_array[1], "MIDDLE ", 8);
}
}
}
if (return_code != 0)
{
printf("Hash function failed with return/reason code %ld/%ld\n",
return_code, reason_code);
return ERROR;
}
else
{
printf("Hash completed successfully.\n");
printf("hash length = %ld\n", h_len);
printf("hash = %.32s\n\n", h_out);
return OK;
}
}</pre>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajcsignfile.htm" title="You can protect data from undetected changes by including a proof of identity value called a digital signature.">Generate and verify a digital signature</a></div>
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