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| 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 SEED_SIZE 64 // how many octets to seed rng with |
70 | #define SEED_SIZE 64 // how many octets to seed rng with |
| 47 | |
71 | |
| 48 | #define RSA_KEYBITS 1280 // must be >= 1280 and divisible by 8 |
72 | #define HKDF_XTR_HASH EVP_sha512 |
| 49 | #define RSA_KEYLEN ((RSA_KEYBITS) >> 3) |
73 | #define HKDF_PRF_HASH EVP_sha256 |
| 50 | #define RSA_OVERHEAD (41 + 1) // well, no define for OAEP in openssl |
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| 51 | |
74 | |
| 52 | #define RSA_HASH EVP_ripemd160 ()// speed don't matter, boy, safety does.. I need sha256 :( |
75 | #define HKDF_SALT 32 |
| 53 | #define RSA_HASHLEN (160 >> 3) |
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| 54 | #define RSA_RESLEN RSA_HASHLEN |
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| 55 | |
76 | |
| 56 | #define RSA_IDLEN 16 // how many bytes are used to identify the challenge |
77 | #define RSA_KEYLEN (RSABITS >> 3) |
| 57 | #define RSA_TTL 120 // challenge bytes timeout after n seconds |
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| 58 | |
78 | |
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79 | #define AUTH_DIGEST ENABLE_AUTH |
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80 | #define AUTH_SIZE (HASH_SIZE (AUTH_DIGEST)) |
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81 | #define AUTH_TTL 12 // challenge bytes timeout after n seconds of non-use |
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82 | |
| 59 | #define CIPHER ENABLE_CIPHER () |
83 | #define CIPHER ENABLE_CIPHER |
| 60 | #define CIPHER_KEYLEN (EVP_CIPHER_key_length (CIPHER)) |
84 | #define CIPHER_KEYSIZE (KEY_SIZE (CIPHER)) |
| 61 | #define DIGEST ENABLE_DIGEST () |
85 | |
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86 | #define MAC_DIGEST ENABLE_HMAC |
| 62 | #define HMAC_KEYLEN (256 >> 3) // number of bits used for the HMAC key |
87 | #define MAC_KEYSIZE HASH_SIZE (ENABLE_HMAC) // number of bits used for the HMAC key |
| 63 | |
88 | |
| 64 | #define WINDOWSIZE 512 // sliding window size |
89 | #define WINDOWSIZE 512 // sliding window size |
| 65 | #define MAX_SEQNO (0xfffffff0U - WINDOWSIZE * 8) |
90 | #define MAX_SEQNO (0xfffffff0U - WINDOWSIZE * 8) |
| 66 | |
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| 67 | #define CHG_SEQNO 0 // where the seqno starts within the rsa challenge |
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| 68 | #define CHG_CIPHER_KEY (CHG_SEQNO + 4) // where the key starts within the rsa challenge |
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| 69 | //#define CHG_HMAC_KEY (CHG_CIPHER_KEY + CIPHER_KEYLEN) // where the key starts within the rsa challenge |
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| 70 | #define CHG_HMAC_KEY 86 // where the key starts within the rsa challenge |
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| 71 | // 872 rsa bits used |
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| 72 | |
91 | |
| 73 | // hdr seq len hmac MAC MAC |
92 | // hdr seq len hmac MAC MAC |
| 74 | #define VPE_OVERHEAD (4 + 4 + 4 + RAND_SIZE + HMACLENGTH - 6 - 6) |
93 | #define VPE_OVERHEAD (4 + 4 + 4 + RAND_SIZE + HMACLENGTH - 6 - 6) |
| 75 | #define IP_OVERHEAD 20 // size of a (normal) ip header |
94 | #define IP_OVERHEAD 20 // size of a (normal) ip header |
| 76 | #define GRE_OVERHEAD (IP_OVERHEAD + 4) |
95 | #define GRE_OVERHEAD (IP_OVERHEAD + 4) |
