Mercurial > dropbear
annotate libtomcrypt/src/headers/tomcrypt_pkcs.h @ 1790:42745af83b7d
Introduce extra delay before closing unauthenticated sessions
To make it harder for attackers, introduce a delay to keep an
unauthenticated session open a bit longer, thus blocking a connection
slot until after the delay.
Without this, while there is a limit on the amount of attempts an attacker
can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to
handle one attempt is still short and thus for each of the allowed parallel
attempts many attempts can be chained one after the other. The attempt rate
is then:
"MAX_UNAUTH_PER_IP / <process time of one attempt>".
With the delay, this rate becomes:
"MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".
author | Thomas De Schampheleire <thomas.de_schampheleire@nokia.com> |
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date | Wed, 15 Feb 2017 13:53:04 +0100 |
parents | 6dba84798cd5 |
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rev | line source |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 |
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10 /* PKCS Header Info */ |
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11 |
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12 /* ===> PKCS #1 -- RSA Cryptography <=== */ |
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13 #ifdef LTC_PKCS_1 |
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14 |
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15 enum ltc_pkcs_1_v1_5_blocks |
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16 { |
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17 LTC_PKCS_1_EMSA = 1, /* Block type 1 (PKCS #1 v1.5 signature padding) */ |
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18 LTC_PKCS_1_EME = 2 /* Block type 2 (PKCS #1 v1.5 encryption padding) */ |
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19 }; |
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20 |
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21 enum ltc_pkcs_1_paddings |
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22 { |
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23 LTC_PKCS_1_V1_5 = 1, /* PKCS #1 v1.5 padding (\sa ltc_pkcs_1_v1_5_blocks) */ |
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24 LTC_PKCS_1_OAEP = 2, /* PKCS #1 v2.0 encryption padding */ |
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25 LTC_PKCS_1_PSS = 3, /* PKCS #1 v2.1 signature padding */ |
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26 LTC_PKCS_1_V1_5_NA1 = 4 /* PKCS #1 v1.5 padding - No ASN.1 (\sa ltc_pkcs_1_v1_5_blocks) */ |
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27 }; |
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28 |
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29 int pkcs_1_mgf1( int hash_idx, |
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30 const unsigned char *seed, unsigned long seedlen, |
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31 unsigned char *mask, unsigned long masklen); |
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32 |
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33 int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out); |
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34 int pkcs_1_os2ip(void *n, unsigned char *in, unsigned long inlen); |
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35 |
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36 /* *** v1.5 padding */ |
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37 int pkcs_1_v1_5_encode(const unsigned char *msg, |
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38 unsigned long msglen, |
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39 int block_type, |
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40 unsigned long modulus_bitlen, |
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41 prng_state *prng, |
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42 int prng_idx, |
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43 unsigned char *out, |
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44 unsigned long *outlen); |
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45 |
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46 int pkcs_1_v1_5_decode(const unsigned char *msg, |
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47 unsigned long msglen, |
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48 int block_type, |
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49 unsigned long modulus_bitlen, |
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50 unsigned char *out, |
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51 unsigned long *outlen, |
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52 int *is_valid); |
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53 |
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54 /* *** v2.1 padding */ |
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55 int pkcs_1_oaep_encode(const unsigned char *msg, unsigned long msglen, |
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56 const unsigned char *lparam, unsigned long lparamlen, |
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57 unsigned long modulus_bitlen, prng_state *prng, |
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58 int prng_idx, int hash_idx, |
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59 unsigned char *out, unsigned long *outlen); |
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60 |
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61 int pkcs_1_oaep_decode(const unsigned char *msg, unsigned long msglen, |
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62 const unsigned char *lparam, unsigned long lparamlen, |
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63 unsigned long modulus_bitlen, int hash_idx, |
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64 unsigned char *out, unsigned long *outlen, |
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65 int *res); |
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66 |
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67 int pkcs_1_pss_encode(const unsigned char *msghash, unsigned long msghashlen, |
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68 unsigned long saltlen, prng_state *prng, |
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69 int prng_idx, int hash_idx, |
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70 unsigned long modulus_bitlen, |
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71 unsigned char *out, unsigned long *outlen); |
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72 |
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73 int pkcs_1_pss_decode(const unsigned char *msghash, unsigned long msghashlen, |
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74 const unsigned char *sig, unsigned long siglen, |
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75 unsigned long saltlen, int hash_idx, |
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76 unsigned long modulus_bitlen, int *res); |
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77 |
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78 #endif /* LTC_PKCS_1 */ |
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79 |
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80 /* ===> PKCS #5 -- Password Based Cryptography <=== */ |
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81 #ifdef LTC_PKCS_5 |
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82 |
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83 /* Algorithm #1 (PBKDF1) */ |
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84 int pkcs_5_alg1(const unsigned char *password, unsigned long password_len, |
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85 const unsigned char *salt, |
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86 int iteration_count, int hash_idx, |
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87 unsigned char *out, unsigned long *outlen); |
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88 |
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89 /* Algorithm #1 (PBKDF1) - OpenSSL-compatible variant for arbitrarily-long keys. |
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90 Compatible with EVP_BytesToKey() */ |
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91 int pkcs_5_alg1_openssl(const unsigned char *password, |
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92 unsigned long password_len, |
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93 const unsigned char *salt, |
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94 int iteration_count, int hash_idx, |
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95 unsigned char *out, unsigned long *outlen); |
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96 |
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97 /* Algorithm #2 (PBKDF2) */ |
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98 int pkcs_5_alg2(const unsigned char *password, unsigned long password_len, |
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99 const unsigned char *salt, unsigned long salt_len, |
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100 int iteration_count, int hash_idx, |
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101 unsigned char *out, unsigned long *outlen); |
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102 |
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103 int pkcs_5_test (void); |
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104 #endif /* LTC_PKCS_5 */ |
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105 |
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106 /* ref: $Format:%D$ */ |
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107 /* git commit: $Format:%H$ */ |
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108 /* commit time: $Format:%ai$ */ |