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spc_gather_keyboard_entropy( ), 631 SpcGatherMouseEntropy( ), 639, 642 SpcGetCertCRLURL( ), 559 spc_get_credentials( ), 483 SpcGetCryptContext( ), 244 spc_getenv( ), 93 SpcGetExportableContext( ), 145, 244 spc_getsession( ), 463 spc_group_ismember( ), 375 spc_hex2bin( ), 122 SPC_HMAC_Init( ), 278 spc_host_check( ), 385 spc_host_init( ), 381 SpcImportKeyData( ), 145, 245 SpcIncrementalHMAC( ), 277 spc_incremental_hmac( ), 277 spc_is_safedir( ), 46 spc_keygen( ), 119, 578, 596 SPC_KEY_SCHED macro, 172 spc_krb5_cleanup( ), 418 spc_krb5_client( ), client-side authentication using Kerberos, 415 spc_krb5_decrypt( ), 474 spc_krb5_encrypt( ), 472 spc_krb5_isdes( ), 472 spc_krb5_server( ), server-side authentication using Kerberos, 416 spc_lion_decrypt( ), 216 spc_lion_encrypt( ), 216 spc_listen( ), 458 spc_lock_file( ), 60 SpcLockResource( ), 64 SpcLookupCACert( ), 559 spc_lookup_key( ), 441, 443 SpcLookupName( ), 376 SpcLookupSid( ), 378 spc_mac127( ), 289 spc_mac127_init( ), 289 spc_make_derived_key( ), 144 spc_make_fd_nonblocking( ), 577 SpcMakeTempFile( ), 67 spc_md5_encrypt( ), 403 spc_md5_verify( ), 408 spc_mdc2_final( ), 296 spc_mdc2_init( ), 296 spc_mdc2_oneblock( ), 296 spc_mdc2_update( ), 296 spc_memcpy( ), 706 spc_memmove( ), 706 spc_memset( ), 706 spc_memzero( ), key deletion using, 149 spc_mprng_init( ), 590 758 | Index spc_mprng_rand( ), 590 SpcNewStoreForCert( ), 534 spc_next_varg( ), 709 spc_ocspresult_t spc_verify_via_ocsp( ), 565 spc_ofb_decrypt( ), 193 spc_ofb_encrypt( ), 193 spc_ofb_final( ), 196 spc_ofb_update( ), 195, 196 spc_omac1_init( ), 281, 305 spc_OMAC1_nonced( ), 286 spc_omac2_init( ), 281 spc_omac_final( ), 282, 305 spc_omac_update( ), 282, 305 spc_omc_update( ), 305 spc_pam_login( ), 412 spc_pam_logout( ), 414 SpcPBKDF2( ), 138 spc_pbkdf2( ), 136 arguments, 138 spc_pbkdf2_encrypt( ), 409 spc_pbkdf2_verify( ), 411 spc_pctr_do_odd( ), 210 spc_pctr_setup( ), 210 SPC_PIPE object, 31 spc_popen( ), 31 spc_print_hex(), 120 spc_putenv( ), 94 spc_rand( ), 324, 578, 586 getting random integers using, 606 HMAC-SHA1 pseudo-random number generator, 591 OpenSSL PRNG, usage in, 605 RC4 as a PRNG, 587 spc_rand_add_entropy( ), 595 spc_rand_init( ), 586 spc_rand_range( ), 67 random integer in a range, generation with, 607 shuffling using, 612 spc_rand_real( ), 609 spc_rand_uint( ), 607 spc_read_password( ), 395 spc_reconnect( ), 462 spc_remember_cert( ), 439 spc_remember_key( ), 443 spc_remove_padding( ), 206 SpcResolvePath( ), 99 spc_restore_privileges( ), 18 SpcRetrieveCRL( ), 561 spc_rsrclimit( ), 729 spc_sanitize_environment( ), 5 spc_sanitize_files( ), 25 This is the Title of the Book, eMatter Edition Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
spc_send_credentials( ), 483 SpcSetIV( ), 241 spc_smc_decrypt( ), 694 spc_socket_accept( ), 477 spc_socket_close( ), 477 spc_socketpool_close( ), 727 spc_socketpool_init( ), 724 spc_socketpool_setlimit( ), 724 spc_socket_recvfrom( ), 477 spc_socket_sendto( ), 477 spc_ssock_client_send( ), 495 spc_ssock_t object erasure, 499 initialization, 495 SPC_TEST_BOOL macro, 670 spc_threadpool_cleanup( ), 723 spc_threadpool_init( ), 722 spc_threadpool_schedule( ), 719, 721 spc_throttle( ), 399 spc_trap_detect( ), 683 spc_unix_connect( ), 485 spc_unix_server( ), 485 SpcUnlockResource( ), 64 SPC_USE_DBG_SYM macro, 681 spc_user_getname( ), 373 spc_utf8_isvalid( ), 111 spc_verifyandmaybesave_callback( ), 439 spc_verify_callback( ), 528 SpcVerifyCert( ), 534 spc_verify_cert( ), 529 SpcVerifyCertHostName( ), 541 spc_verify_cert_hostname( ), 540 spc_verify_nonced_digest( ), 272 spc_verify_via_ocsp( ), 565 SpcWipeFile( ), 49 spc_words2bin(), 131 spc_x509store_addusecert( ), 538 spc_x509store_clearflags( ), 528 spc_x509store_setcafile( ), 527 spc_x509store_setcallback( ), 528 spc_x509store_setcapath( ), 439, 527 spc_x509store_setcrlfile( ), 527 spc_x509store_setflags( ), 528 spc_x509store_setusecertfile( ), 538 spc_x509store_t objects, 526, 536 SPLIT_VAR macro, 669 spoofing of hostnames, IP addresses, 379 sprintf( ), 77 SQL injection attacks, 107–110 SRP (Secure Remote Password), 368 SSL (Secure Sockets Layer), 371 clients, creating, 455–457 database connections, securing with, 487 MySQL, 488 PostgreSQL, 489 servers, creating, 457–460 session caching, 460–463 session caching modes, 461 sessions vs. connections, 460 tunnels, 468–470 verifying a peer’s certificate, 535–539 SSL_accept( ), 460 SSL_CTX objects, 459, 535 flagging and modes, 535 SSL_CTX_set_cipher_list( ), 536 SSL_CTX_set_verify( ), 535 SSL_SESSION objects, 463 SSL_SESSION_free( ), 463 SSLv2 protocol, insecurity of, 536 SSPI (Security Support Provider Interface), 454 StackGuard, 78 stack-smashing attacks, 79 preventive technologies, 83 stat( ), 54 station-to-station protocol, 436 stdarg.h file, 711 stdin, stdout, and stderr file descriptors, 23 Stevens, W. Richard, 714 str, input to spc_words2bin( ), 132 strcpy( ), 80 strdup( ), 93 stream ciphers, 146, 157 precomputing keystream for, 207 PRNGs compared to, 582 using as PRNGs, 587 RC4, 587 strings of random ASCII characters, getting, 611 strlcat( ), 80 strlcpy( ), 80 strncpy( ), 73, 80 strsafe.h, 81 Stunnel, 468–470 accept and connect keys, 469 certificate and verification limitations, 490 client mode, enabling, 470 configuration file, 469 server mode, enabling, 469 Version 4.00 changes in configuration controls, 468 surreptitious forwarding attacks, 343 This is the Title of the Book, eMatter Edition Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved. Index | 759
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Secure Programming Cookbook ΤΜ fo
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Secure Programming CookbookΤΜ for
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Table of Contents Foreword . . . .
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5.8 Using a Generic OFB Mode Implem
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8.10 Performing Password-Based Auth
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12.10 Restructuring Arrays 672 12.1
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they are in the top 50% of safe dri
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think you are in, you will probably
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the C programming language, with so
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igger risks than anticipated. You s
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Recipe Compatibility Most of the re
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The O’Reilly web site for the boo
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Chapter 1 CHAPTER 1 Safe Initializa
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using the code in this recipe on Wi
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variables you preserve, be sure to
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ptr = (char *)new_environ + (arr_si
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an impersonation token for a thread
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Creating a new process with a restr
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array that is the Privileges field.
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eturn 0; } if (!LookupAccountName(0
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privileges. We strongly advise agai
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#include #include #include #incl
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sockets provide a means by which fi
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The privman library provides a numb
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The potential for security vulnerab
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It’s important to remember that t
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Discussion execve( ) is the system
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should call pclose( ) to clean up t
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dup2(stdout_pipe[1], 1); close(stdo
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lpCommandLine Any command-line argu
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#include #include #include void
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and a saved user ID. * The effectiv
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See Also Recipes 1.3, 1.4, 2.8 2.2
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of the object, regardless of what t
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There are many other situations whe
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if (!(fd = opendir("."))) break; if
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spc_file_wipe( ) A wrapper around t
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if (pattern_pass(fd, buf, sizeof(bu
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CryptReleaseContext(hProvider, 0);
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2.7 Restricting Access Permissions
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eset the umask between your adjustm
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Locking files on Windows Where Unix
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NFS older than Version 3 in particu
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a loop until all the data is read.
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if (!(hResourceLock = CreateMutex(0
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generator. The code presented here
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access to the filesystem, the poten
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Chapter 3 CHAPTER 3 Input Validatio
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components of the system are truste
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try to use them. For example, what
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To combat malicious uses of “%n
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Discussion Buffer overflows get a l
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Unfortunately, strlcpy( ) and strlc
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The second problem area occurs when
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(see Recipe 3.2). The format-string
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safestr_release( ) or safestr_free(
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Solution Unfortunately, integer coe
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which the records begin. Generally,
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pointer or a different value altoge
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if (!(new_environ = (char **)malloc
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if (spc_environ) free(environ); env
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GetFullPathName( ) requires the len
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if (*c != '%' || !isxdigit(c[1]) ||
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3.10 Preventing Cross-Site Scriptin
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* These are HTML tags that do not t
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*ptr++ = *c; } while (*++c != ’>
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Finally, if you are using the LIKE
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Table 3-2. UTF-8 encoding byte sequ
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the connections to the server. The
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SPC_FD_SET read_mask; for (;;) { sp
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To ensure that you choose the right
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See Also Recipe 13.2 4.2 Generating
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This function takes the following a
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} break; default: if (isspace(p[0])
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*p = 0; return output; } } } The pu
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} return result; case -1: if (stric
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#define MAX_WORDLEN 4 /* len parame
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Discussion This function spc_words2
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4.9 Using Salts, Nonces, and Initia
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the lifetime of the key; the counte
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#include #include #include #incl
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#include #include /* This value n
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} CryptReleaseContext(hProvider, hK
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cryptographic one-way hash from a t
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HMAC_CTX c; unsigned long ctr = 0,
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database does not support binary st
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Remember to use a MAC anytime you e
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For many different reasons, it can
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A more portable but less accurate w
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Chapter 5 CHAPTER 5 Symmetric Encry
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Discussion Be sure to read this dis
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Pentium III, which should give a go
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locations where 40-bit keys or 56-b
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can arise. For general-purpose use,
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or similar mechanism is used. As wi
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shares many properties with CTR mod
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case, the faster of the two algorit
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parison to standard modes. As of th
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work, which severely limits portabi
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Table 5-4. Implementations for the
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Plaintext block 1 Plaintext block 2
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typedef struct { SPC_KEY_SCHED ks;
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If you are using padding and you kn
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This function has the following arg
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if (ol) *ol = out - start; return 1
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that the state function is always r
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Note that this code depends on the
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if (!il--) return 1; ctx->nonce[ctx
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one block at a time, by encrypting
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spc_memset(key,0, kl); memcpy(ctx->
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5.9 Using a Generic CTR Mode Implem
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These two functions also erase the
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we ignore that because it will alwa
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Once those bindings are made, the Z
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output Buffer into which the plaint
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eturn the number of valid bytes in
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In CBC, CFB, and OFB modes, encrypt
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void spc_pctr_do_odd(SPC_CTR2_CTX *
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5.15 Performing File or Disk Encryp
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Therefore, we’ll show you LION, b
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} RC4_set_key(&k, HASH_SZ, (char *)
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techniques from Chapter 8), the key
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communicate asynchronously (that is
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key Pointer to the encryption key t
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Table 5-6. Cipher instantiation ref
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While RC2, RC4, and RC5 support abs
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The function EVP_CIPHER_CTX_ctrl( )
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Discussion As a reminder, use a raw
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ol = 0; if (!(ret = (char *)malloc(
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The “official” RC4 key setup fu
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Discussion One-time pads are provab
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Once a provider context has been su
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Table 5-8. Symmetric ciphers suppor
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hKey Key to use for performing the
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if (!CryptAcquireContext(&hProvider
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exportable from key objects, but th
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Chapter 6 CHAPTER 6 Hashes and Mess
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Generally, you should prefer an enc
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See Also Recipes 6.7, 6.8, 6.12 6.2
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Noncorrelation It should also be co
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Let’s look briefly at the pros an
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Solution In most cases, instead of
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MAC (which we recommend), we strong
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Libraries with cryptographic hash f
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#include int main(int argc, char *
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See Also Implementations of SHA-256
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CryptAcquireContext(&hProvider, 0,
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To ensure the best security, we str
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if (!(vfy = (unsigned char *)malloc
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you might use a library such as Ope
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Otherwise, you can use the HMAC imp
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if (klen inner[i] ^= key[i]; ctx->o
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OMAC has been explicitly specified
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unsigned char c1[SPC_BLOCK_SZ]; /*
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ing the all-zero data block. Each p
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CMAC is the message-integrity compo
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To postprocess, we encrypt the hash
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6.15 Constructing a Hash Function f
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unsigned char b[SPC_KEY_SZ]; size_t
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Figure 6-2. The Mayas-Meyer-Oseas c
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c->ix = 0; c->tl = 0; } static void
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modes such as CWC and CCM are start
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authentication in a straightforward
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SPC_HMAC_Reset(&ctx); SPC_HMAC_Upda
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divide up the data stream between t
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Chapter 7 CHAPTER 7 Public Key Cryp
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The code presented in this chapter
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Because public key encryption is so
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Solution There’s some debate on t
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7.4 Manipulating Big Numbers Proble
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There’s a similar function for as
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Additionally, you can ask for a ran
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In addition, you might wish to test
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Table 7-2. Math operations supporte
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313, 317, 331, 337, 347, 349, 353,
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for (b = 0; !BN_is_odd(x); b++) BN_
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BIGNUM *dP, *dQ, *qInv; } RSA_PRIVA
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This would map to the hexadecimal v
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compute d. Without those two primes
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The constants that may be used to s
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When using OpenSSL, decryption can
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ecommend using it, unless you are c
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ture is valid. A successful check w
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et = RSA_verify(NID_sha1, hash, 20,
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#define MIN(x,y) ((x) > (y) ? (y) :
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memcpy(signedtext, decrypt, 16); if
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h_ret Optional argument that, if no
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siglen The number of bytes written
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data ready to go into the certifica
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ut it requires you to pass in the l
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LjKQ2r1Yt9foxbHdLKZeClqZuzN7PoEmy+b
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ing in data, pass in a pointer to a
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Table 7-6 lists the FILE object-bas
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Solution The correct method depends
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Use across applications For some pe
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key agreement protocol, where both
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consider slightly more sophisticate
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Kerberos does assume that the envir
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The function used to look up user i
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The group structure that is returne
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found, NULL will be returned, and G
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ReferencedDomainName = (LPTSTR)Loca
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if (errno != EINTR && errno != EAGA
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if (!(spc_host_rulecount % 256)) {
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} else { if (inet_addr(tmp) = = INA
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8.5 Generating Random Passwords and
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for this list is not insignificant.
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file, it may allocate a sizable amo
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On Windows, you can use the standar
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Once getpass( ) or readpassphrase(
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ters typed by the user. Instead, th
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compute the future time at which th
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decrypt the encrypted data. To make
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On systems that support MCF through
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for (i = 0; i < 1000; i++) { MD5_In
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CryptHashData(hHash1, lpszKey, dwKe
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Solution Use the PBKDF2 method of c
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Verifying a password encrypted usin
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c Pointer to an integer that will r
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each of these pieces of information
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server-side part of the authenticat
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8.14 Authenticating with HTTP Cooki
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char *spc_cookie_encode(char *cooki
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• Let the salt be public, in whic
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extra Additional application-specif
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xl Pointer into which the length of
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With a valid socket descriptor in h
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11. The client and the server compu
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Some people like to use a fixed mod
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Often, you’ll want to generate a
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Discussion Remember, authentication
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• Provide the user with some way
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if (!fgets(answer, sizeof(answer),
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uffer = (char *)realloc(buffer, buf
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compromise. If our system has such
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When using RSA, if you’re doing o
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see the confirmation request and th
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Upon receipt of a response to a con
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BOOL SpcConfirmationCreate(LPCTSTR
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Additionally, over time, SSPI-speci
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if (!spc_verify_cert_hostname(SSL_g
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The next step is to call spc_accept
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Discussion Session caching is norma
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if (BIO_do_connect(conn)
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The next step is to connect to the
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DWORD dwHeadersLength = 0; LPSTR lp
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attempt to develop and debug SSL-en
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API for encryption and decryption,
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memcpy(in_data.data, inbuf, inlen);
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*outlen = out_data.length - (blksz
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so. Likewise, any process with the
Page 507 and 508:
struct sockaddr_un *addr_unix; *dom
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error_exit: if (sock) spc_socket_cl
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different ways. On FreeBSD systems,
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msg.msg_iov->iov_base = (void *)&sy
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it’s unique and unpredictable! Yo
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if (mysql_real_connect(mysql, host,
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maintenance. Adding or removing ser
Page 521 and 522:
ut they shouldn’t tolerate reorde
Page 523 and 524:
#define SPC_CLIENT_DISTINGUISHER 0x
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} static void spc_ssock_write( int
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while (mlen) { if ((r = read(fd, ms
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In such cases, you need to be able
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Discussion One of the big motivator
Page 533 and 534:
A digital certificate contains info
Page 535 and 536:
Certificate revocation What happens
Page 537 and 538:
cate as long as it still has its pr
Page 539 and 540:
Currently, OCSP is not nearly as wi
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ple is the permissible uses for a c
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automated email to the address you
Page 545 and 546:
The type of code-signing certificat
Page 547 and 548:
10.3 Using Root Certificates Proble
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Table 10-1. CA certificates, their
Page 551 and 552:
ights of the entity tied to that ce
Page 553 and 554:
10.5 Performing X.509 Certificate V
Page 555 and 556:
sk_X509_free(spc_store->crls); sk_X
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X509_LOOKUP *lookup; store = X509_S
Page 559 and 560:
CertGetIssuerCertificateFromStore(
Page 561 and 562:
HCERTSTORE hCertStore; PCCERT_CONTE
Page 563 and 564:
See Also Recipe 10.11 10.7 Verifyin
Page 565 and 566:
SPC_X509STORE_SSL_VERIFY_NONE This
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verify_flags |= SSL_VERIFY_FAIL_IF_
Page 569 and 570:
int spc_verify_cert_hostname(X509 *
Page 571 and 572:
for (i = 0; !bResult && i < pNameIn
Page 573 and 574:
only work you really need to do is
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digest = EVP_sha1( ); fingerprint_l
Page 577 and 578:
if (cert && (uri = get_distribution
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"\xb3\x9c\x25\xb1\xc3\x2e\x32\x53\x
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headerlen -= (*datalen + 2); if (*d
Page 583 and 584:
In this recipe, we have used a numb
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{ "\x8d\x26\xff\x2f\x31\x6d\x59x\29
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LocalFree(pvStructInfo); return 0;
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lpFullBuffer = lpNewBuffer; lpBuffe
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of tunable variables that affect th
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SPC_OCSPRESULT_CERTIFICATE_VALID =
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* All done. Set the return code bas
Page 597 and 598:
Solution There are essentially thre
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the byte is even, he reduces the nu
Page 601 and 602:
See Also Recipes 11.16, 11.18, 11.1
Page 603 and 604:
11.3 Using the Standard Unix Random
Page 605 and 606:
a pointer to data. Instead, they re
Page 607 and 608:
if (errno = = EINTR) continue; perr
Page 609 and 610:
Here we show how to use this functi
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attacks are a realistic threat, you
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This function never fails (save for
Page 615 and 616:
Using a stream cipher as a generato
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One very safe way to use a cryptogr
Page 619 and 620:
out Buffer into which the random da
Page 621 and 622:
1. Figure out how big a seed you ne
Page 623 and 624:
0x00 Query the amount of entropy be
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strncpy(a.sun_path, EGD_SOCKET_PATH
Page 627 and 628:
} } while (nb = = -1); } } } See Al
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nbytes Number of bytes of entropy t
Page 631 and 632:
See Also • EGADS by Secure Softwa
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If the generator is not seeded with
Page 635 and 636:
Discussion In all cases, you will s
Page 637 and 638:
Solution Because of the way that fl
Page 639 and 640:
double spc_rand_cunifvariate(double
Page 641 and 642:
See Also Recipe 11.11 11.16 Compres
Page 643 and 644:
It would be nice if you did not hav
Page 645 and 646:
For this reason, we think the full
Page 647 and 648:
} int cur_val, i, j, runsz; unsigne
Page 649 and 650:
See Also • NIST Cryptographic Mod
Page 651 and 652:
ecause even if a source does fail c
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you use a seed file, you can just c
Page 655 and 656:
• If you have to accept data from
Page 657 and 658:
with a high-resolution clock (i.e.,
Page 659 and 660:
Collecting entropy from the keyboar
Page 661 and 662:
f[c + 2] = '>'; } else snprintf(bf,
Page 663 and 664:
SpcGatherKeyboardEntropy( ) uses th
Page 665 and 666:
} } if (hWndParent) EnableWindow(hW
Page 667 and 668:
number of bits of entropy has been
Page 669 and 670:
} return TRUE; pDlgData->cbRequeste
Page 671 and 672:
See Also Recipes 11.19, 11.20 11.22
Page 673 and 674:
Discussion We strongly recommend th
Page 675 and 676:
Chapter 12 CHAPTER 12 Anti-Tamperin
Page 677 and 678:
tecture-specific checks to determin
Page 679 and 680:
ure or to examine a hardware valida
Page 681 and 682:
• Detecting modification to a com
Page 683 and 684:
for (j = 8; j > 0; j--) { if (crc &
Page 685 and 686:
#include CRC_START_BLOCK(test) int
Page 687 and 688:
Solution Obfuscating compiled code
Page 689 and 690:
" movl 0f( , %%ebx ), %%eax \n\t" \
Page 691 and 692:
Because library functions are loade
Page 693 and 694:
encoded as a series of 32 Obcode bi
Page 695 and 696:
12.5 Performing Constant Transforms
Page 697 and 698:
12.7 Splitting Variables Problem La
Page 699 and 700:
12.9 Using Function Pointers Proble
Page 701 and 702:
arrays. This array type will hide t
Page 703 and 704:
eak; case SPC_ARRAY_FOLD: index = (
Page 705 and 706:
The following example demonstrates
Page 707 and 708:
Discussion The techniques for hidin
Page 709 and 710:
12.12 Detecting Debuggers Problem S
Page 711 and 712:
Discussion The spc_trap_detect( ) f
Page 713 and 714:
12.14 Detecting Windows Debuggers P
Page 715 and 716:
The int3 interface can also be used
Page 717 and 718:
To demonstrate the effect this macr
Page 719 and 720:
08048388 83 db 83h ; â 08048389 7D
Page 721 and 722:
ine the instruction making the refe
Page 723 and 724:
mprotect(buf, buf_len, PROT_READ |
Page 725 and 726:
eturn 4; } /* get entry point : her
Page 727 and 728:
need to use one of the three ring3
Page 729 and 730:
cates failure, it’s likely that n
Page 731 and 732:
tion gets caught. The only ways to
Page 733 and 734:
memory location will generally stil
Page 735 and 736: eturn dst; } volatile void *spc_mem
Page 737 and 738: The mlock( ) system call on Unix im
Page 739 and 740: Discussion Both C and C++ allow the
Page 741 and 742: Do not share signal handlers. Sever
Page 743 and 744: #endif } static int signal_was_caug
Page 745 and 746: paper reached the widest audience,
Page 747 and 748: The proper way to handle a program
Page 749 and 750: handles[0] = cond; handles[1] = mut
Page 751 and 752: #ifndef WIN32 pool->tids = (pthread
Page 753 and 754: #define SPC_ACQUIRE_MUTEX(mtx) pthr
Page 755 and 756: if (socketpool_limit > 0 && socketp
Page 757 and 758: Table 13-1. Resources that may be l
Page 759 and 760: ability to run. The default limits
Page 761 and 762: Note that the structures as present
Page 763 and 764: access to the machine. This makes i
Page 765: ing log entries. It is possible, ho
Page 768 and 769: attacks (continued) capture replay
Page 770 and 771: CFB (Cipher Feedback) mode, 167, 18
Page 772 and 773: deriving symmetric keys from a pass
Page 774 and 775: EVP_CIPHER_CTX_set_padding( ), 227
Page 776 and 777: integrity checking cipher modes, 16
Page 778 and 779: message digests (continued) desirab
Page 780 and 781: parallelizing MACs, 304 parent and
Page 782 and 783: RAND_bytes( ), 604 RAND_load_file(
Page 784 and 785: session ID context, 461 session IDs
Page 788 and 789: symmetric cryptography, 116-154 alg
Page 790 and 791: Windows (continued) Win 2000, restr
Page 792: oads. They will often travel up to
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Problem - Kevin Tafuro

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