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Michael Brown
76f7b88f93
For TLS version 1.1, non-RSA signed digests use SHA-1 instead of
MD5+SHA1. Commit f095adb ("[tls] Use SHA-1 for TLS version 1.1 ECDSA
signatures") selected the correct digest algorithm for both server and
client authentication.
However, the key schedule currently refuses to generate client
CertificateVerify digests for any digest algorithm other than
MD5+SHA1, on the basis that only the MD5+SHA1 running transcript
digest value is available.
An MD5+SHA1 digest value is just the concatenation of an MD5 digest
value with a SHA-1 digest value, and so the SHA-1 digest value can be
provided for use with ECDSA client certificates.
Fix by special-casing the SHA-1 (and MD5) algorithms when generating a
signable digest value from the TLS version 1.1 key schedule.
Signed-off-by: Michael Brown <mcb30@ipxe.org>