Mikhail Belopuhov: OpenBSD: Where is crypto headed?

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This document discusses trends in cryptography and secure random number generation. It notes weaknesses identified in RC4 and recommends moving to ChaCha20 or Salsa20 instead. It also recommends replacing RSA-based and NIST-standard cryptography with algorithms like Curve25519 for Diffie-Hellman key exchange and Ed25519 for signatures, which are patent-free and have constant-time implementations. The document suggests these algorithms could be used in TLS, SSH, and IPsec to improve security without performance penalties.

Technology Education

OpenBSD: Where crypto is heading?
Mike Belopuhov
.vantronix secure systems
mikeb@openbsd.org

Moscow, December 14 2013

Pseudo-random number generator
rand (ANSI C, POSIX)

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)
/dev/[au]random (Linux)

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)
/dev/[au]random
arc4random (OpenBSD)

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)
/dev/[au]random
arc4random in Linux! (libbsd)

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)
/dev/[au]random
arc4random (RC4?)

RC4 security
2001 Fluhrer, Mantin and Shamir attack
2005 Klein attack

1

2

2013 AlFardan, Bernstein, Paterson, et. al.

1

Weaknesses in the Key Scheduling Algorithm of RC4

2

Attacks on the RC4 stream cipher

3

On the Security of RC4 in TLS and WPA

3

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)
/dev/[au]random
arc4random (ChaCha?!)

ChaCha20 stream cipher
http://cr.yp.to/chacha.html
Based on Salsa20 (in eSTREAM portfolio)
Used in BLAKE (SHA-3 finalist)
4 cpb on modern x86
128/256 bit key

ChaCha versus Salsa
Improved diffusion
But no performance hit
IETF Crypto Forum Research Group (CFRG) “is confident
that the analysis was sufficiently thorough that ChaCha
is an acceptable alternative to SALSA-20.” 4

4

Synopsis of CFRG discussions on new stream ciphers and MACs for TLS

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)
/dev/[au]random
arc4random
libottery

Pseudo-random number generator
rand (ANSI C, POSIX)
*rand48 (POSIX)
random (POSIX)
/dev/[au]random
arc4random
goodrandom?

SSL/TLS
SSL/TLS ciphers
RC4
AES-CBC
AES-GCM

SSL 2.0+
SSL 3.0+
TLS 1.2

SSL/TLS in Chrome
Undocumented option --cipher-suite-blacklist
0x0004 TLS_RSA_WITH_RC4_128_MD5
0x0005 TLS_RSA_WITH_RC4_128_SHA
0x000a TLS_RSA_WITH_3DES_EDE_CBC_SHA
0x0032 TLS_DHE_DSS_WITH_AES_128_CBC_SHA
0xc007 TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
0xc011 TLS_ECDHE_RSA_WITH_RC4_128_SHA
Values from RFC 2246

AES-GCM
NIST standard of authenticated encryption
AES-CTR + GHASH
NSA Suite B, SSH, TLS, IPsec, MACsec, FC-SP, WiGig
Experimental support in the OpenBSD IPsec stack

AES-NI and CLMUL
Available in Intel Westmere and newer
7 new SSE instructions
Implemented in OpenSSL and OCF
FPU “locks” in the kernel
CBC, CTR, XTS, GCM

ChaCha20-Poly1305 for TLS draft
Google have proposed draft-agl-tls-chacha20poly1305

ChaCha20-Poly1305 for TLS draft
Google have proposed draft-agl-tls-chacha20poly1305
E5-2690 2.9GHz
AES-128-GCM
131 MB/s
AES-128-GCM with AES-NI 311 MB/s
ChaCha20+Poly1305
420 MB/s
Cortex-A9 1.2GHz
AES-128-GCM
ChaCha20+Poly1305

27 MB/s
78 MB/s

Salsa20-SHA1 for TLS draft
RedHat et al. draft-josefsson-salsa20-tls
Revision Changes
01
Salsa20/12 with 128-bit key removed
02
UMAC-96 added
03
UMAC-96 removed

Poly1305 MAC
http://cr.yp.to/mac.html
“Poly1305 can be written in a tweet”

5

About 4 cpb w/o the cipher
Security mainly depends on a chosen cipher
(AES, ChaCha, etc.)

5

Salsa20 and Poly1305 in TLS

NIST curves
2013 Bernstein, Lange “Security dangers of NIST curves”
http://safecurves.cr.yp.to/

6

Security dangers of the NIST curves

6

Curve25519 Diffie-Hellman
http://cr.yp.to/ecdh.html
Does not infringe Certicom patents
Executes in constant time
32 byte private and public keys

Ed25519 EdDSA signatures
http://ed25519.cr.yp.to/
Comparable to RSA3072, NIST P-256
32 byte private and public keys
64 byte signatures
Uses PRF (SHA512)

NIST-free cryptography in OpenSSH
Support in OpenBSD-current:
Cipher/MAC
Key exchange
Public keys

chacha20-poly1305@openssh.com
curve25519-sha256@libssh.org
ssh-ed25519-cert-v01@openssh.com

IPsec/IKEv2 possibilities
It’s possible to use “Private Range” in IKEv2
ChaCha20-Poly1305 AEAD for ESP

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