Mercurial > dropbear
annotate libtomcrypt/src/headers/tomcrypt_pkcs.h @ 1715:3974f087d9c0
Disallow leading lines before the ident for server (#102)
Per RFC4253 4.2 clients must be able to process other lines of data
before the version string, server behavior is not defined neither
with MUST/SHOULD nor with MAY.
If server process up to 50 lines too - it may cause too long hanging
session with invalid/evil client that consume host resources and
potentially may lead to DDoS on poor embedded boxes.
Let's require first line from client to be version string and fail
early if it's not - matches both RFC and real OpenSSH behavior.
| author | Vladislav Grishenko <themiron@users.noreply.github.com> |
|---|---|
| date | Mon, 15 Jun 2020 18:22:18 +0500 |
| 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: $Format:%ai$ */ |