| 1 | /* |
1 | /* |
| 2 | global.h -- global variables and constants |
2 | global.h -- global variables and constants |
| 3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2013 Marc Lehmann <gvpe@schmorp.de> |
| 4 | |
4 | |
| 5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
| 6 | |
6 | |
| 7 | GVPE is free software; you can redistribute it and/or modify it |
7 | GVPE is free software; you can redistribute it and/or modify it |
| 8 | under the terms of the GNU General Public License as published by the |
8 | under the terms of the GNU General Public License as published by the |
| … | |
… | |
| 34 | |
34 | |
| 35 | #include "config.h" |
35 | #include "config.h" |
| 36 | |
36 | |
| 37 | #include <time.h> |
37 | #include <time.h> |
| 38 | |
38 | |
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39 | #define HASH_BITS(hash) hashbits_ ## hash |
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40 | #define HASH_SIZE(hash) (HASH_BITS (hash) >> 3) |
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41 | #define hashbits_EVP_ripemd160 160 |
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42 | #define hashbits_EVP_sha1 160 |
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43 | #define hashbits_EVP_sha224 224 |
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44 | #define hashbits_EVP_sha256 256 |
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45 | #define hashbits_EVP_sha384 384 |
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46 | #define hashbits_EVP_sha512 512 |
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47 | #define hashbits_EVP_whirlpool 512 |
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48 | |
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49 | #define KEY_BITS(cipher) keybits_ ## cipher |
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50 | #define KEY_SIZE(cipher) (KEY_BITS (cipher) >> 3) |
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51 | #define keybits_EVP_bf_cbc 128 // actually 32-448 |
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52 | #define keybits_EVP_aes_128_cbc 128 |
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53 | #define keybits_EVP_aes_192_cbc 192 |
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54 | #define keybits_EVP_aes_256_cbc 256 |
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55 | |
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56 | #define BLOCK_BITS(cipher) blockbits_ ## cipher |
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57 | #define BLOCK_SIZE(cipher) (BLOCK_BITS (cipher) >> 3) |
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58 | #define blockbits_EVP_bf_cbc 64 |
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59 | #define blockbits_EVP_aes_128_cbc 128 |
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60 | #define blockbits_EVP_aes_192_cbc 128 |
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61 | #define blockbits_EVP_aes_256_cbc 128 |
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62 | |
| 39 | /* Protocol version. Different major versions are incompatible, |
63 | /* Protocol version. Different major versions are incompatible, |
| 40 | * different minor versions probably are compatible ;) |
64 | * different minor versions probably are compatible ;) |
| 41 | */ |
65 | */ |
| 42 | |
66 | |
| 43 | #define PROTOCOL_MAJOR 0 |
67 | #define PROTOCOL_MAJOR 1 |
| 44 | #define PROTOCOL_MINOR 1 |
68 | #define PROTOCOL_MINOR 0 |
| 45 | |
69 | |
| 46 | #define RSA_KEYBITS 1280 // must be >= 1280 and divisible by 8 |
70 | #define SERIAL_SIZE 16 |
| 47 | #define RSA_KEYLEN ((RSA_KEYBITS) >> 3) |
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| 48 | #define RSA_OVERHEAD (41 + 1) // well, no define for OAEP in openssl |
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| 49 | |
71 | |
| 50 | #define RSA_HASH EVP_ripemd160 ()// speed don't matter, boy, safety does.. I need sha256 :( |
72 | #define SEED_SIZE 64 // how many octets to seed rng with |
| 51 | #define RSA_HASHLEN (160 >> 3) |
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| 52 | #define RSA_RESLEN RSA_HASHLEN |
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| 53 | |
73 | |
| 54 | #define RSA_IDLEN 16 // how many bytes are used to identify the challenge |
74 | #define RSA_OAEP_SIZE 41 |
| 55 | #define RSA_TTL 120 // challenge bytes timeout after n seconds |
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| 56 | |
75 | |
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76 | #define HKDF_XTR_HASH EVP_sha512 |
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77 | #define HKDF_PRF_HASH EVP_sha256 |
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78 | |
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79 | #define HKDF_SALT 32 // how many bytes for the hkdf salt |
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80 | |
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81 | #define RSA_KEYLEN (RSABITS >> 3) |
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82 | |
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83 | #define AUTH_DIGEST ENABLE_AUTH |
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84 | #define AUTH_SIZE (HASH_SIZE (AUTH_DIGEST)) |
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85 | #define AUTH_TTL 12 // challenge bytes timeout after n seconds of non-use |
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86 | |
| 57 | #define CIPHER ENABLE_CIPHER () |
87 | #define CIPHER ENABLE_CIPHER |
| 58 | #define CIPHER_KEYLEN (EVP_CIPHER_key_length (CIPHER)) |
88 | #define CIPHER_KEYSIZE (KEY_SIZE (CIPHER)) |
| 59 | #define DIGEST ENABLE_DIGEST () |
89 | #define CIPHER_IKMSIZE CIPHER_KEYSIZE * 2 // randomness in rsa challenge |
| 60 | #define HMAC_KEYLEN (256 >> 3) // number of bits used for the HMAC key (also change CHG_HMAC_KEY) |
90 | |
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91 | #define MAC_DIGEST ENABLE_HMAC |
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92 | #define MAC_KEYSIZE HASH_SIZE (ENABLE_HMAC) // number of bits used for the HMAC key |
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93 | #define MAC_IKMSIZE MAC_KEYSIZE * 2 // randomness in rsa challenge |
| 61 | |
94 | |
| 62 | #define WINDOWSIZE 512 // sliding window size |
95 | #define WINDOWSIZE 512 // sliding window size |
| 63 | #define MAX_SEQNO (0xfffffff0U - WINDOWSIZE * 8) |
96 | #define MAX_SEQNO (0xfffffff0U - WINDOWSIZE * 8) |
| 64 | |
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| 65 | #define CHG_SEQNO 0 // where the seqno starts within the rsa challenge |
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| 66 | #define CHG_CIPHER_KEY 4 // where the key starts within the rsa challenge |
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| 67 | #define CHG_HMAC_KEY 86 // where the key starts within the rsa challenge (256 bits at the end!) |
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| 68 | |
97 | |
| 69 | // hdr seq len hmac MAC MAC |
98 | // hdr seq len hmac MAC MAC |
| 70 | #define VPE_OVERHEAD (4 + 4 + 4 + RAND_SIZE + HMACLENGTH - 6 - 6) |
99 | #define VPE_OVERHEAD (4 + 4 + 4 + RAND_SIZE + HMACLENGTH - 6 - 6) |
| 71 | #define IP_OVERHEAD 20 // size of a (normal) ip header |
100 | #define IP_OVERHEAD 20 // size of a (normal) ip header |
| 72 | #define GRE_OVERHEAD (IP_OVERHEAD + 4) |
101 | #define GRE_OVERHEAD (IP_OVERHEAD + 4) |
