rfc2875.txt
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(imported from [PROFILE]).
5. Security Considerations
In the static DH POP algorithm, an appropriate value can be produced
by either party. Thus this algorithm only provides integrity and not
origination service. The Discrete Logarithm algorithm provides both
integrity checking and origination checking.
Prafullchandra & Schaad Standards Track [Page 7]
RFC 2875 Diffie-Hellman Proof-of-Possession Algorithms July 2000
All the security in this system is provided by the secrecy of the
private keying material. If either sender or recipient private keys
are disclosed, all messages sent or received using that key are
compromised. Similarly, loss of the private key results in an
inability to read messages sent using that key.
Selection of parameters can be of paramount importance. In the
selection of parameters one must take into account the
community/group of entities that one wishes to be able to communicate
with. In choosing a set of parameters one must also be sure to avoid
small groups. [FIPS-186] Appendixes 2 and 3 contain information on
the selection of parameters. The practices outlined in this document
will lead to better selection of parameters.
6. References
[FIPS-186] Federal Information Processing Standards Publication
(FIPS PUB) 186, "Digital Signature Standard", 1994 May
19.
[RFC2314] Kaliski, B., "PKCS #10: Certification Request Syntax
v1.5", RFC 2314, October 1997.
[RFC2104] Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
Hashing for Message Authentication", RFC 2104, February
1997.
[PROFILE] Housley, R., Ford, W., Polk, W., and D. Solo, "Internet
X.509 Public Key Infrastructure: Certificate and CRL
Profile", RFC 2459, January 1999.
[DH-X9.42] Rescorla, E., "Diffie-Hellman Key Agreement Method", RFC
2631, June 1999.
7. Authors' Addresses
Hemma Prafullchandra
Critical Path Inc.
5150 El Camino Real, #A-32
Los Altos, CA 94022
Phone: (640) 694-6812
EMail: hemma@cp.net
Jim Schaad
EMail: jimsch@exmsft.com
Prafullchandra & Schaad Standards Track [Page 8]
RFC 2875 Diffie-Hellman Proof-of-Possession Algorithms July 2000
Appendix A. ASN.1 Module
DH-Sign DEFINITIONS IMPLICIT TAGS ::=
BEGIN
--EXPORTS ALL
-- The types and values defined in this module are exported for use
-- in the other ASN.1 modules. Other applications may use them
-- for their own purposes.
IMPORTS
IssuerAndSerialNumber, MessageDigest
FROM CryptographicMessageSyntax { iso(1) member-body(2)
us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16)
modules(0) cms(1) }
Dss-Sig-Value, DomainParameters
FROM PKIX1Explicit88 {iso(1) identified-organization(3) dod(6)
internet(1) security(5) mechanisms(5) pkix(7) id-mod(0)
id-pkix1-explicit-88(1)};
id-dh-sig-hmac-sha1 OBJECT IDENTIFIER ::= {id-pkix id-alg(6) 3}
DhSigStatic ::= SEQUENCE {
IssuerAndSerial IssuerAndSerialNumber OPTIONAL,
hashValue MessageDigest
}
id-alg-dh-pop OBJECT IDENTIFIER ::= {id-pkix id-alg(6) 4}
END
Prafullchandra & Schaad Standards Track [Page 9]
RFC 2875 Diffie-Hellman Proof-of-Possession Algorithms July 2000
Appendix B. Example of Static DH Proof-of-Possession
The following example follows the steps described earlier in section
3.
Step 1: Establishing common Diffie-Hellman parameters. Assume the
parameters are as in the DER encoded certificate. The certificate
contains a DH public key signed by a CA with a DSA signing key.
0 30 939: SEQUENCE {
4 30 872: SEQUENCE {
8 A0 3: [0] {
10 02 1: INTEGER 2
: }
13 02 6: INTEGER
: 00 DA 39 B6 E2 CB
21 30 11: SEQUENCE {
23 06 7: OBJECT IDENTIFIER dsaWithSha1 (1 2 840 10040 4 3)
32 05 0: NULL
: }
34 30 72: SEQUENCE {
36 31 11: SET {
38 30 9: SEQUENCE {
40 06 3: OBJECT IDENTIFIER countryName (2 5 4 6)
45 13 2: PrintableString 'US'
: }
: }
49 31 17: SET {
51 30 15: SEQUENCE {
53 06 3: OBJECT IDENTIFIER organizationName (2 5 4 10)
58 13 8: PrintableString 'XETI Inc'
: }
: }
68 31 16: SET {
70 30 14: SEQUENCE {
72 06 3: OBJECT IDENTIFIER organizationalUnitName (2 5 4
11)
77 13 7: PrintableString 'Testing'
: }
: }
86 31 20: SET {
88 30 18: SEQUENCE {
90 06 3: OBJECT IDENTIFIER commonName (2 5 4 3)
95 13 11: PrintableString 'Root DSA CA'
: }
: }
: }
108 30 30: SEQUENCE {
Prafullchandra & Schaad Standards Track [Page 10]
RFC 2875 Diffie-Hellman Proof-of-Possession Algorithms July 2000
110 17 13: UTCTime '990914010557Z'
125 17 13: UTCTime '991113010557Z'
: }
140 30 70: SEQUENCE {
142 31 11: SET {
144 30 9: SEQUENCE {
146 06 3: OBJECT IDENTIFIER countryName (2 5 4 6)
151 13 2: PrintableString 'US'
: }
: }
155 31 17: SET {
157 30 15: SEQUENCE {
159 06 3: OBJECT IDENTIFIER organizationName (2 5 4 10)
164 13 8: PrintableString 'XETI Inc'
: }
: }
174 31 16: SET {
176 30 14: SEQUENCE {
178 06 3: OBJECT IDENTIFIER organizationalUnitName (2 5 4
11)
183 13 7: PrintableString 'Testing'
: }
: }
192 31 18: SET {
194 30 16: SEQUENCE {
196 06 3: OBJECT IDENTIFIER commonName (2 5 4 3)
201 13 9: PrintableString 'DH TestCA'
: }
: }
: }
212 30 577: SEQUENCE {
216 30 438: SEQUENCE {
220 06 7: OBJECT IDENTIFIER dhPublicKey (1 2 840 10046 2 1)
229 30 425: SEQUENCE {
233 02 129: INTEGER
: 00 94 84 E0 45 6C 7F 69 51 62 3E 56 80 7C 68 E7
: C5 A9 9E 9E 74 74 94 ED 90 8C 1D C4 E1 4A 14 82
: F5 D2 94 0C 19 E3 B9 10 BB 11 B9 E5 A5 FB 8E 21
: 51 63 02 86 AA 06 B8 21 36 B6 7F 36 DF D1 D6 68
: 5B 79 7C 1D 5A 14 75 1F 6A 93 75 93 CE BB 97 72
: 8A F0 0F 23 9D 47 F6 D4 B3 C7 F0 F4 E6 F6 2B C2
: 32 E1 89 67 BE 7E 06 AE F8 D0 01 6B 8B 2A F5 02
: D7 B6 A8 63 94 83 B0 1B 31 7D 52 1A DE E5 03 85
: 27
365 02 128: INTEGER
: 26 A6 32 2C 5A 2B D4 33 2B 5C DC 06 87 53 3F 90
: 06 61 50 38 3E D2 B9 7D 81 1C 12 10 C5 0C 53 D4
: 64 D1 8E 30 07 08 8C DD 3F 0A 2F 2C D6 1B 7F 57
Prafullchandra & Schaad Standards Track [Page 11]
RFC 2875 Diffie-Hellman Proof-of-Possession Algorithms July 2000
: 86 D0 DA BB 6E 36 2A 18 E8 D3 BC 70 31 7A 48 B6
: 4E 18 6E DD 1F 22 06 EB 3F EA D4 41 69 D9 9B DE
: 47 95 7A 72 91 D2 09 7F 49 5C 3B 03 33 51 C8 F1
: 39 9A FF 04 D5 6E 7E 94 3D 03 B8 F6 31 15 26 48
: 95 A8 5C DE 47 88 B4 69 3A 00 A7 86 9E DA D1 CD
496 02 33: INTEGER
: 00 E8 72 FA 96 F0 11 40 F5 F2 DC FD 3B 5D 78 94
: B1 85 01 E5 69 37 21 F7 25 B9 BA 71 4A FC 60 30
: FB
531 02 97: INTEGER
: 00 A3 91 01 C0 A8 6E A4 4D A0 56 FC 6C FE 1F A7
: B0 CD 0F 94 87 0C 25 BE 97 76 8D EB E5 A4 09 5D
: AB 83 CD 80 0B 35 67 7F 0C 8E A7 31 98 32 85 39
: 40 9D 11 98 D8 DE B8 7F 86 9B AF 8D 67 3D B6 76
: B4 61 2F 21 E1 4B 0E 68 FF 53 3E 87 DD D8 71 56
: 68 47 DC F7 20 63 4B 3C 5F 78 71 83 E6 70 9E E2
: 92
630 30 26: SEQUENCE {
632 03 21: BIT STRING 0 unused bits
: 1C D5 3A 0D 17 82 6D 0A 81 75 81 46 10 8E 3E DB
: 09 E4 98 34
655 02 1: INTEGER 55
: }
: }
: }
658 03 132: BIT STRING 0 unused bits
: 02 81 80 5F CF 39 AD 62 CF 49 8E D1 CE 66 E2 B1
: E6 A7 01 4D 05 C2 77 C8 92 52 42 A9 05 A4 DB E0
: 46 79 50 A3 FC 99 3D 3D A6 9B A9 AD BC 62 1C 69
: B7 11 A1 C0 2A F1 85 28 F7 68 FE D6 8F 31 56 22
: 4D 0A 11 6E 72 3A 02 AF 0E 27 AA F9 ED CE 05 EF
: D8 59 92 C0 18 D7 69 6E BD 70 B6 21 D1 77 39 21
: E1 AF 7A 3A CF 20 0A B4 2C 69 5F CF 79 67 20 31
: 4D F2 C6 ED 23 BF C4 BB 1E D1 71 40 2C 07 D6 F0
: 8F C5 1A
: }
793 A3 85: [3] {
795 30 83: SEQUENCE {
797 30 29: SEQUENCE {
799 06 3: OBJECT IDENTIFIER subjectKeyIdentifier (2 5 29
14)
804 04 22: OCTET STRING
: 04 14 80 DF 59 88 BF EB 17 E1 AD 5E C6 40 A3 42
: E5 AC D3 B4 88 78
: }
828 30 34: SEQUENCE {
830 06 3: OBJECT IDENTIFIER authorityKeyIdentifier (2 5 29
35)
Prafullchandra & Schaad Standards Track [Page 12]
RFC 2875 Diffie-Hellman Proof-of-Possession Algorithms July 2000
835 01 1: BOOLEAN TRUE
838 04 24: OCTET STRING
: 30 16 80 14 6A 23 37 55 B9 FD 81 EA E8 4E D3 C9
: B7 09 E5 7B 06 E3 68 AA
: }
864 30 14: SEQUENCE {
866 06 3: OBJECT IDENTIFIER keyUsage (2 5 29 15)
871 01 1: BOOLEAN TRUE
874 04 4: OCTET STRING
: 03 02 03 08
: }
: }
: }
: }
880 30 11: SEQUENCE {
882 06 7: OBJECT IDENTIFIER dsaWithSha1 (1 2 840 10040 4 3)
891 05 0: NULL
: }
893 03 48: BIT STRING 0 unused bits
: 30 2D 02 14 7C 6D D2 CA 1E 32 D1 30 2E 29 66 BC
: 06 8B 60 C7 61 16 3B CA 02 15 00 8A 18 DD C1 83
: 58 29 A2 8A 67 64 03 92 AB 02 CE 00 B5 94 6A
: }
Step 2. End Entity/User generates a Diffie-Hellman key-pair using the
parameters from the CA certificate.
EE DH public key: SunJCE Diffie-Hellman Public Key:
Y: 13 63 A1 85 04 8C 46 A8 88 EB F4 5E A8 93 74 AE
FD AE 9E 96 27 12 65 C4 4C 07 06 3E 18 FE 94 B8
A8 79 48 BD 2E 34 B6 47 CA 04 30 A1 EC 33 FD 1A
0B 2D 9E 50 C9 78 0F AE 6A EC B5 6B 6A BE B2 5C
DA B2 9F 78 2C B9 77 E2 79 2B 25 BF 2E 0B 59 4A
93 4B F8 B3 EC 81 34 AE 97 47 52 E0 A8 29 98 EC
D1 B0 CA 2B 6F 7A 8B DB 4E 8D A5 15 7E 7E AF 33
62 09 9E 0F 11 44 8C C1 8D A2 11 9E 53 EF B2 E8
EE DH private key:
X: 32 CC BD B4 B7 7C 44 26 BB 3C 83 42 6E 7D 1B 00
86 35 09 71 07 A0 A4 76 B8 DB 5F EC 00 CE 6F C3
Step 3. Compute K and the signature.
LeadingInfo: DER encoded Subject/Requestor DN (as in the generated
Certificate Signing Request)
Prafullchandra & Schaad Standards Track [Page 13]
RFC 2875 Diffie-Hellman Proof-of-Possession Algorithms July 2000
30 4E 31 0B 30 09 06 03 55 04 06 13 02 55 53 31
11 30 0F 06 03 55 04 0A 13 08 58 45 54 49 20 49
6E 63 31 10 30 0E 06 03 55 04 0B 13 07 54 65 73
74 69 6E 67 31 1A 30 18 06 03 55 04 03 13 11 50
4B 49 58 20 45 78 61 6D 70 6C 65 20 55 73 65 72
TrailingInfo: DER encoded Issuer/Recipient DN (from the certificate
described in step 1)
30 46 31 0B 30 09 06 03 55 04 06 13 02 55 53 31
11 30 0F 06 03 55 04 0A 13 08 58 45 54 49 20 49
6E 63 31 10 30 0E 06 03 55 04 0B 13 07 54 65 73
74 69 6E 67 31 12 30 10 06 03 55 04 03 13 09 44
48 20 54 65 73 74 43 41
K:
F4 D7 BB 6C C7 2D 21 7F 1C 38 F7 DA 74 2D 51 AD
14 40 66 75
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