Merge upstream go post-1.9 crypto/tls changes from master:
d8ee5d11e5 crypto/tls: limit number of consecutive warning alerts
96cd66b266 crypto/tls: advertise support for SHA-512 signatures in 1.2
f265f5db5d archive/zip, crypto/tls: use rand.Read instead of casting ints to bytes
54d04c2fcb crypto/tls: remove bookkeeping code from pHash function
d1bbdbe760 crypto/tls: replace signatureAndHash by SignatureScheme.
cb3b345209 crypto/tls: fix first byte test for 255 CBC padding bytes
d153df8e4b all: revert "all: prefer strings.LastIndexByte over strings.LastIndex"
5e42658fc0 all: prefer bytes.IndexByte over bytes.Index
d2826d3e06 all: prefer strings.LastIndexByte over strings.LastIndex
5a986eca86 all: fix article typos
0f9a2cf2c4 crypto/tls: fix clientHelloMsg fuzzer not to generate the RI SCSV
e7d46cee2f crypto/tls: fix and expand TestVerifyPeerCertificate and TestGetClientCertificate
85deaf6077 crypto/tls: fix docstring of Config.ClientSessionCache
4a5f85babb crypto/tls: disallow handshake messages fragmented across CCS
b3465646ff crypto/tls: add BenchmarkHandshakeServer
d38d357c78 crypto/tls: don't check whether an ec point is on a curve twice
e085a891f0 crypto/tls: split clientHandshake into multiple methods
Conflicts:
* handshake_client.go: conflict between our ("crypto/tls: allow client to
pick TLS 1.3, do not enable it by default.") and upstream
("crypto/tls: split clientHandshake into multiple methods"), resolve
by applying the mutualVersion->pickVersion change in pickTLSVersion.
* handshake_server.go: trivial conflict due to upstreamed patch
("crypto/tls: replace signatureAndHash by SignatureScheme.") and
("crypto/tls: implement TLS 1.3 server 0-RTT") which added pskBinder.
Other merge changes:
* tls13.go: signatureAndHashes as added in ("crypto/tls: implement TLS
1.3 minimal server") was renamed as required by ("crypto/tls: replace
signatureAndHash by SignatureScheme.").
* handshake_client.go: moved check from ("crypto/tls: check that client
cipher suite matches version") to pickCipherSuite as required by
("crypto/tls: split clientHandshake into multiple methods").
Use the new keySchedule13 type instead of hash.Hash to avoid tracking
the hashContext and intermediate secrets manually.
checkPSK is modified not to return the calculated early secret, this is
internal to keySchedule13 now. The caller just learns whether it was
resumed using a PSK or not.
In order to reduce repetitive complexity (extract handshake context,
pass the right secrets around to calculate a secret and build a cipher),
create a new type that tracks the hash type, the handshake context and
intermediate secrets.
Advantages: facilitates reuse between client and server code, makes it
easier to update labels for draft-19, makes it easier to add central
KeyLogWriter functionality.
There should be no data in the Handshake buffer on encryption state
changes (including implicit 1.3 transitions). Checking that also blocks
all Handshake messages fragmented across CCS.
BoGo: PartialClientFinishedWithClientHello
Phase should only be accessed under in.Mutex. Handshake and all Read
operations obtain that lock. However, many functions checking for
handshakeRunning only obtain handshakeMutex: reintroduce
handshakeCompleted for them. ConnectionState and Close check for
handshakeConfirmed, introduce an atomic flag for them.
