Mercurial > dropbear

annotate libtomcrypt/notes/tech0006.txt @ 1715:3974f087d9c0

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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 1b9e69c058d2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
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1 Tech Note 0006
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2 PK Standards Compliance
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3 Tom St Denis
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4
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5 RSA
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6 ----
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7
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8 PKCS #1 compliance.
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9
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10 Key Format: RSAPublicKey and RSAPrivateKey as per PKCS #1 v2.1
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11 Encryption: OAEP as per PKCS #1
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12 Signature : PSS as per PKCS #1
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13
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14 DSA
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15 ----
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16
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17 The NIST DSA algorithm
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18
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19 Key Format: HomeBrew [see below]
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20 Signature : ANSI X9.62 format [see below].
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21
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22 Keys are stored as
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23
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24 DSAPublicKey ::= SEQUENCE {
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25 publicFlags BIT STRING(1), -- must be 0
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26 g INTEGER , -- base generator, check that g^q mod p == 1
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27 -- and that 1 < g < p - 1
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28 p INTEGER , -- prime modulus
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29 q INTEGER , -- order of sub-group (must be prime)
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30 y INTEGER , -- public key, specifically, g^x mod p,
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31 -- check that y^q mod p == 1
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32 -- and that 1 < y < p - 1
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33 }
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34
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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35 DSAPrivateKey ::= SEQUENCE {
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36 publicFlags BIT STRING(1), -- must be 1
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37 g INTEGER , -- base generator, check that g^q mod p == 1
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38 -- and that 1 < g < p - 1
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39 p INTEGER , -- prime modulus
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40 q INTEGER , -- order of sub-group (must be prime)
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41 y INTEGER , -- public key, specifically, g^x mod p,
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42 -- check that y^q mod p == 1
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43 -- and that 1 < y < p - 1
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44 x INTEGER -- private key
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45 }
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46
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47 Signatures are stored as
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48
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49 DSASignature ::= SEQUENCE {
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50 r, s INTEGER -- signature parameters
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51 }
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52
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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53 ECC
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54 ----
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55
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56 The ANSI X9.62 and X9.63 algorithms [partial]. Supports all NIST GF(p) curves.
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57
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58 Key Format : Homebrew [see below, only GF(p) NIST curves supported]
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59 Signature : X9.62 compliant
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60 Encryption : Homebrew [based on X9.63, differs in that the public point is stored as an ECCPublicKey]
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61 Shared Secret: X9.63 compliant
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62
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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63 ECCPublicKey ::= SEQUENCE {
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64 flags BIT STRING(1), -- public/private flag (always zero),
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65 keySize INTEGER, -- Curve size (in bits) divided by eight
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66 -- and rounded down, e.g. 521 => 65
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67 pubkey.x INTEGER, -- The X co-ordinate of the public key point
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68 pubkey.y INTEGER, -- The Y co-ordinate of the public key point
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69 }
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70
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71 ECCPrivateKey ::= SEQUENCE {
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72 flags BIT STRING(1), -- public/private flag (always one),
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73 keySize INTEGER, -- Curve size (in bits) divided by eight
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74 -- and rounded down, e.g. 521 => 65
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75 pubkey.x INTEGER, -- The X co-ordinate of the public key point
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76 pubkey.y INTEGER, -- The Y co-ordinate of the public key point
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77 secret.k INTEGER, -- The secret key scalar
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78 }
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79
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80 The encryption works by finding the X9.63 shared secret and hashing it. The hash is then simply XOR'ed against the message [which must be at most the size
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81 of the hash digest]. The format of the encrypted text is as follows
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82
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83 ECCEncrypted ::= SEQUENCE {
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84 hashOID OBJECT IDENTIFIER, -- The OID of the hash used
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85 pubkey OCTET STRING , -- Encapsulation of a random ECCPublicKey
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86 skey OCTET STRING -- The encrypted text (which the hash was XOR'ed against)
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87 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 % $Source: /cvs/libtom/libtomcrypt/notes/tech0006.txt,v $
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 % $Revision: 1.2 $
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 % $Date: 2005/06/18 02:26:27 $