Examples/CryptTool/CryptTool.cpp

/*
    File:       CryptTool.cpp
        
        Contains:   simple encrypt/decrypt utility to demonstrate use of
                        libCdsaCrypt used for symmetric encryption        
    
        Copyright:  © Copyright 2002 Apple Computer, Inc. All rights reserved.
    
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    Change History (most recent first):
                11/4/02     1.0d1
 
*/
 
 
#include <libCdsaCrypt/libCdsaCrypt.h>
#include <libCdsaCrypt/fileIo.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
static void usage(char **argv) 
{
    printf("usage:\n");
    printf("  %s op password keySizeBits inFile outFile [a=algorithm]\n", argv[0]);
    printf("  op:\n");
    printf("     e  encrypt\n");
    printf("     d  decrypt\n");
    printf("  algorithm:\n");
    printf("     4  RC4\n");
    printf("     c  ASC/ComCryption\n");
    printf("     d  DES\n");
    printf("     a  AES (default if no algorithm specified)\n");
    exit(1);
}
 
int main(int argc, char **argv)
{
    int                 rtn;
    uint32              keySizeInBits;      // from cmd line
    char                *password;          // ASCII password from cmd line
    char                *inFileName;        // from cmd line
    unsigned char       *inFile;            // raw infile data
    unsigned            inFileSize;         // in bytes
    char                *outFileName;       // from cmd line
    CSSM_CSP_HANDLE     cspHandle;
    CSSM_RETURN         crtn;
    int                 doEncrypt = 0;
    CSSM_DATA           inData;             // data to encrypt/decrypt, 
                                            //    from inFile
    CSSM_DATA           outData = {0, NULL};// result data, written to outFile
    CSSM_KEY            cdsaKey;
    CSSM_ALGORITHMS     encrAlg = CSSM_ALGID_AES;
    
    if(argc < 6) {
        usage(argv);
    }
    
    /* gather up cmd line args */
    switch(argv[1][0]) {
        case 'e':
            doEncrypt = 1;
            break;
        case 'd':
            doEncrypt = 0;
            break;
        default:
            usage(argv);
    }
    password = argv[2];
    keySizeInBits = atoi(argv[3]);
    if(keySizeInBits == 0) {
        printf("keySize of 0 illegal\n");
        exit(1);
    }
    inFileName = argv[4];
    outFileName = argv[5];
 
    /* optional algorithm specifier */
    if(argc == 7) {
        if(argv[6][0] != 'a') {
            usage(argv);
        }
        switch(argv[6][2]) {
        case '4':
            /* RC4 stream cipher  */
            encrAlg  = CSSM_ALGID_RC4;
            break;
        case 'c':
            /* ComCryption stream cipher */
            encrAlg  = CSSM_ALGID_ASC;
            break;
        case 'd':
            /* DES block cipher, fixed key size */
            if(keySizeInBits != 64) {
                printf("***DES must have key size of 8 bytes\n");
                exit(1);
            }
            encrAlg  = CSSM_ALGID_DES;
            break;
        case 'a':
            /* AES block cipher, fixed key size */
            if(keySizeInBits != 128) {
                printf("***AES must have key size of 16 bytes\n");
                exit(1);
            }
            encrAlg  = CSSM_ALGID_AES;
            break;
        default:
            usage(argv);
        }
    }
 
    /* read inFile from disk */
    rtn = readFile(inFileName, &inFile, &inFileSize);
    if(rtn) {
        printf("Error reading %s: %s\n", inFileName, strerror(rtn));
        exit(1);
    }
    inData.Data = inFile;
    inData.Length = inFileSize;
    
    /* attach to CSP */
    crtn = cdsaCspAttach(&cspHandle);
    if(crtn) {
        cssmPerror("Attach to CSP", crtn);
        exit(1);
    }
 
    /*
     * Derive an actual encryption/decryption key from the password 
     * ASCII text. We could use the ASCII text directly as key 
     * material but using the DeriveKey function is much more secure 
     * (besides being an industry-standard way to convert an ASCII 
     * password into binary key material). 
     */
    crtn = cdsaDeriveKey(cspHandle,
        password,
        strlen(password),
        encrAlg,
        keySizeInBits,
        &cdsaKey);
    if(crtn) {
        cssmPerror("DeriveKey", crtn);
        exit(1);
    }
    
    /* 
     * Do the encrypt/decrypt.
     */
    if(doEncrypt) {
        crtn = cdsaEncrypt(cspHandle,
            &cdsaKey,
            &inData,
            &outData);
        if(crtn) {
            cssmPerror("cdsaEncrypt", crtn);
        }
    }
    else {
        crtn = cdsaDecrypt(cspHandle,
            &cdsaKey,
            &inData,
            &outData);
        if(crtn) {
            cssmPerror("cdsaDecrypt", crtn);
        }
    }
    if(crtn == CSSM_OK) {
        rtn = writeFile(outFileName, outData.Data, outData.Length);
        if(rtn) {
            printf("Error writing %s: %s\n", outFileName, strerror(rtn));
            exit(1);
        }
        else {
            printf("SUCCESS: inFile length %u bytes, outFile length %u bytes\n",
                inFileSize, (unsigned)outData.Length);
        }
    }
    /* free resources */
    cdsaFreeKey(cspHandle, &cdsaKey);
    free(outData.Data);
    cdsaCspDetach(cspHandle);
    return 0;
}


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