352 lines
19 KiB
HTML
352 lines
19 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Example in ILE C: Reading encrypted data from a file</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- Java sync-link-->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<h2>Example in ILE C: Reading encrypted data from a file</h2>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>Refer to <a href="qc3Scenario.htm">Scenario: Key Management and File Encryption Using the Cryptographic Services APIs</a> for a description of this scenario.</p>
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<img src="delta.gif" alt="Start of change">
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<pre>
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/*-------------------------------------------------------------------*/
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/* */
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/* Sample C program: Bill_Cus */
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/* */
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/* COPYRIGHT 5722-SS1 (c) IBM Corp 2004, 2006 */
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/* */
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/* This material contains programming source code for your */
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/* consideration. These examples have not been thoroughly */
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/* tested under all conditions. IBM, therefore, cannot */
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/* guarantee or imply reliability, serviceability, or function */
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/* of these programs. All programs contained herein are */
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/* provided to you "AS IS". THE IMPLIED WARRANTIES OF */
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/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* EXPRESSLY DISCLAIMED. IBM provides no program services for */
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/* these programs and files. */
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/* */
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/* Description: */
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/* This is a sample program to demonstrate use of the Cryptographic */
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/* Services APIs. APIs demonstrated in this program are: */
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/* Create Algorithm Context */
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/* Create Key Context */
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/* Decrypt Data */
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/* Destroy Key Context */
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/* Destroy Algorithm Context */
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/* */
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/* Function: */
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/* For each record in the Customer Data file (CUSDTA), check the */
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/* accounts receivable balance. If there is a balance, decrypt the */
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/* customer's data and call Bill_Cus to create a bill. The customer*/
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/* data is encrypted with a file key kept in the Customer Processing*/
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/* Information file (CUSPI). */
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/* */
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/* Refer to the iSeries (TM) Information Center for a full */
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/* description of this scenario. */
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/* */
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/* Use the following commands to compile this program: */
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/* CRTCMOD MODULE(MY_LIB/BILL_CUS) SRCFILE(MY_LIB/MY_SRC) */
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/* CRTSRVPGM SRVPGM(MY_LIB/BILL_CUS) + */
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/* MODULE(MY_LIB/BILL_CUS MY_LIB/CREATE_BILL) + */
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/* BNDSRVPGM(QC3CTX QC3PRNG QC3DTADE) */
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/* */
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/*-------------------------------------------------------------------*/
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/*-------------------------------------------------------------------*/
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/* Retrieve various structures/utilities. */
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/*-------------------------------------------------------------------*/
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#include <stdio.h> /* Standard I/O header */
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#include <stdlib.h> /* General utilities */
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#include <stddef.h> /* Standard definitions */
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#include <string.h> /* String handling utilities */
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#include <recio.h> /* Record I/O routines */
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#include <qusec.h> /* Error code structure */
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#include <qc3ctx.h> /* Hdr file for Context APIs */
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#include <qc3dtade.h> /* Hdr file for Decrypt Dta API*/
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/*-------------------------------------------------------------------*/
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/* The following structures were generated with GENCSRC. */
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/*-------------------------------------------------------------------*/
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#ifdef __cplusplus
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#include <bcd.h>
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#else
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#include <decimal.h>
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#endif
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/* ------------------------------------------------------- *
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// PHYSICAL FILE : MY_LIB/CUSPI
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// FILE LAST CHANGE DATE : 2004/02/11
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// RECORD FORMAT : CUSPIREC
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// FORMAT LEVEL IDENTIFIER : 248C15A88E09C
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* ------------------------------------------------------- */
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typedef _Packed struct {
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char KEY[16]; /* ENCRYPTION KEY */
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#ifndef __cplusplus
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decimal( 8, 0) LASTCUS;
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#else
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_DecimalT< 8, 0> LASTCUS; /* LAST CUSTOMER NUMBER */
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/* BCD class SPECIFIED IN DDS */
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#endif
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} CUSPIREC_both_t;
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/* ------------------------------------------------------- *
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// PHYSICAL FILE : MY_LIB/CUSDTA
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// FILE LAST CHANGE DATE : 2004/02/11
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// RECORD FORMAT : CUSDTAREC
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// FORMAT LEVEL IDENTIFIER : 434C857F6F5B3
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* ------------------------------------------------------- */
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typedef _Packed struct {
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#ifndef __cplusplus
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decimal( 8, 0) CUSNUM;
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#else
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_DecimalT< 8, 0> CUSNUM; /* CUSTOMER NUMBER */
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/* BCD class SPECIFIED IN DDS */
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#endif
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char IV[16]; /* INITIALIZATION VECTOR */
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#ifndef __cplusplus
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decimal(10, 2) ARBAL;
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#else
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_DecimalT<10, 2> ARBAL; /* ACCOUNTS RECEIVABLE BALANCE */
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/* BCD class SPECIFIED IN DDS */
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#endif
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char ECUSDTA[80]; /* ENCRYPTED CUSTOMER DATA */
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} CUSDTAREC_both_t;
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/*-------------------------------------------------------------------*/
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/* Function declarations */
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/*-------------------------------------------------------------------*/
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/* Create a bill */
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void Create_Bill(char *customerData, decimal(10, 2) balance);
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/*-------------------------------------------------------------------*/
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/* Start of mainline code. */
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/*-------------------------------------------------------------------*/
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int Bill_Cus()
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{
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/*-------------------------------------------------------------------*/
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/* Return codes */
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/*-------------------------------------------------------------------*/
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int rtn; /* Return code */
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#define ERROR -1
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#define OK 0
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/*-------------------------------------------------------------------*/
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/* File handling variables */
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/*-------------------------------------------------------------------*/
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_RFILE *cuspiPtr; /* Pointer to CUSPI file */
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_RFILE *cusdtaPtr; /* Pointer to CUSDTA file */
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CUSPIREC_both_t cuspi; /* CUSPI record */
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CUSDTAREC_both_t cusdta; /* CUSDTA record */
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/*-------------------------------------------------------------------*/
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/* Parameters needed by the Cryptographic Services APIs */
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/*-------------------------------------------------------------------*/
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Qus_EC_t errCode; /* Error code structure */
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char csp; /* Crypto service provider */
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Qc3_Format_ALGD0200_T algD; /* Block cipher alg description*/
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char AESctx[8]; /* AES alg context token */
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int keySize; /* Key size */
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char keyFormat; /* Key format */
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int keyType; /* Key type */
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char keyForm; /* Key form */
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int keyStringLen; /* Length of key string */
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Qc3_Format_KEYD0400_T kskey; /* Key store structure */
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char KEKctx[8]; /* KEK key context token */
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char FKctx[8]; /* File key context token */
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char pcusdta[80]; /* Plaintext customer data */
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int cipherLen; /* Length of ciphertext */
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int plainLen; /* Length of plaintext */
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int rtnLen; /* Return length */
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/*-------------------------------------------------------------------*/
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/* Initializations */
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/*-------------------------------------------------------------------*/
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/* Set to generate exceptions */
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memset(&errCode, 0, sizeof(errCode));
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/* Use any crypto provider */
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csp = Qc3_Any_CSP;
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/*-------------------------------------------------------------------*/
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/* Create an AES algorithm context for the key-encrypting key (KEK). */
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/*-------------------------------------------------------------------*/
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memset(&algD, 0, sizeof(algD)); /* Init alg description to null*/
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algD.Block_Cipher_Alg = Qc3_AES; /* Set AES algorithm */
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algD.Block_Length = 16; /* Block size is 16 */
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algD.Mode = Qc3_CBC; /* Use cipher block chaining */
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algD.Pad_Option = Qc3_No_Pad; /* Do not pad */
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/* Create algorithm context */
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Qc3CreateAlgorithmContext((unsigned char *)&algD,
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Qc3_Alg_Block_Cipher, AESctx, &errCode);
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/*-------------------------------------------------------------------*/
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/* Create a key context for the key-encrypting key (KEK). */
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/*-------------------------------------------------------------------*/
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keyFormat = Qc3_KSLabel_Struct; /* Key format is keystore label*/
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keyStringLen = sizeof(kskey); /* Length of key string */
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keyType = Qc3_AES; /* Key type is AES */
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keyForm = Qc3_Clear; /* Key string is clear */
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memset(&kskey, 0, sizeof(kskey)); /* Init name structure to null */
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/* Set key store file name */
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memset(kskey.Key_Store, 0x40, sizeof(kskey.Key_Store));
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memcpy(kskey.Key_Store,"CUSKEYFILEMY_LIB", 16);
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/* Set key store label */
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memset(kskey.Record_Label, 0x40, sizeof(kskey.Record_Label));
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memcpy(kskey.Record_Label, "CUSDTAKEK", 9);
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/* Create key context */
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Qc3CreateKeyContext((char*)&kskey, &keyStringLen, &keyFormat, &keyType,
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&keyForm, NULL, NULL, KEKctx, &errCode);
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/*-------------------------------------------------------------------*/
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/* Open Customer Processing Information file (CUSPI). */
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/* Read first record to obtain the encrypted file key. */
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/*-------------------------------------------------------------------*/
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/* Open CUSPI file */
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if ((cuspiPtr = _Ropen("MY_LIB/CUSPI", "rr, arrseq=Y, riofb=N"))
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== NULL)
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{ /* If null ptr returned */
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/* Send error message */
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printf("Open of Customer Processing Information file (CUSPI) failed.");
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return ERROR; /* Return with error */
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}
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/* Read the first(only) record */
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/* to get encrypted file key. */
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if ((_Rreadf(cuspiPtr, &cuspi, sizeof(cuspi), __DFT))->num_bytes
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== EOF)
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{ /* If record not found */
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/* Send error message */
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printf("Customer Processing Information (CUSPI) record missing.");
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_Rclose(cuspiPtr); /* Close CUSPI file */
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return ERROR; /* Return with error */
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}
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/*-------------------------------------------------------------------*/
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/* Create a key context for the file key. */
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/*-------------------------------------------------------------------*/
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keySize = sizeof(cuspi.KEY); /* Key size */
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keyFormat = Qc3_Bin_String; /* Key format is binary string */
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keyType = Qc3_AES; /* Key type is AES */
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keyForm = Qc3_Encrypted; /* Key is encrypted with a KEK */
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/* Create key context */
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Qc3CreateKeyContext(cuspi.KEY, &keySize, &keyFormat, &keyType,
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&keyForm, KEKctx, AESctx, FKctx, &errCode);
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/*-------------------------------------------------------------------*/
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/* Wipe out the encryptd file key value from program storage and */
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/* close the CUSPI file. */
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/*-------------------------------------------------------------------*/
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/* Wipe out encrypted file key */
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memset(cuspi.KEY, 0, sizeof(cuspi.KEY));
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_Rclose(cuspiPtr); /* Close CUSPI file */
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/*-------------------------------------------------------------------*/
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/* Open Customer Data file. */
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/*-------------------------------------------------------------------*/
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/* Open CUSDTA file */
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if ((cusdtaPtr = _Ropen("MY_LIB/CUSDTA", "rr, arrseq=Y, riofb=N"))
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== NULL)
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{ /* If null ptr returned */
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/* Send error message */
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printf("Open of CUSDTA file failed.");
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return ERROR;
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}
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/*-------------------------------------------------------------------*/
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/* Read each record of CUSDTA. */
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/*-------------------------------------------------------------------*/
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/* Read next record in file */
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/* while not End-Of-File */
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while ((_Rreadn(cusdtaPtr, &cusdta, sizeof(cusdta), __DFT))->num_bytes
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!= EOF)
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{
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/*-------------------------------------------------------------------*/
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/* If accounts receivable balance > 0, decrypt customer data and */
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/* create a bill for the customer. */
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/*-------------------------------------------------------------------*/
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if (cusdta.ARBAL > 0)
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{
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/* Copy IV to alg description */
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memcpy(algD.Init_Vector, cusdta.IV, 16);
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/* Decrypt customer data */
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cipherLen = sizeof(cusdta.ECUSDTA);
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plainLen = sizeof(pcusdta);
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Qc3DecryptData(cusdta.ECUSDTA, &cipherLen,
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(char*)&algD, Qc3_Alg_Block_Cipher,
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FKctx, Qc3_Key_Token,
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&csp, NULL, pcusdta, &plainLen, &rtnLen,
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&errCode);
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/* Create bill */
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Create_Bill(pcusdta, cusdta.ARBAL);
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}
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}
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/*-------------------------------------------------------------------*/
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/* Cleanup. */
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/*-------------------------------------------------------------------*/
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/* Clear plaintext data */
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memset(&pcusdta, 0, sizeof(pcusdta));
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/* Destroy file key context */
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Qc3DestroyKeyContext(FKctx, &errCode);
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/* Destroy KEK context */
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Qc3DestroyKeyContext(KEKctx, &errCode);
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/* Destroy the alg context */
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Qc3DestroyAlgorithmContext(AESctx, &errCode);
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/* Close CUSDTA file */
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_Rclose(cusdtaPtr);
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/* Return successful */
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return OK;
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}
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</pre>
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<p><img src="deltaend.gif" alt="End of change"></p>
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<br>
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> |
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<a href= "catcrypt.htm">Cryptographic Services APIs</a> |<a href=
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"aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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