annotate libtomcrypt/notes/tech0006.txt @ 1861:2b3a8026a6ce

Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 1b9e69c058d2
children
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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
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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
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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
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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 }
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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 $