tree b9052b10eaff95604d4a43ffc925ba8acbd41b19
parent ca45c35e65818ec2e2c13291053d2f7a20e709a0
author Gilles Peskine <Gilles.Peskine@arm.com> 1530186961 +0200
committer itayzafrir <itay.zafrir@arm.com> 1536759671 +0300

Change ECDSA signature representation to r||s

Change the representation of an ECDSA signature from the ASN.1 DER
encoding used in TLS and X.509, to the concatenation of r and s
in big-endian order with a fixed size. A fixed size helps memory and
buffer management and this representation is generally easier to use
for anything that doesn't require the ASN.1 representation. This is
the same representation as PKCS#11 (Cryptoki) except that PKCS#11
allows r and s to be truncated (both to the same length), which
complicates the implementation and negates the advantage of a
fixed-size representation.