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The Key Usage extension is described in section 4.2.1.3 of X.509, with the following possible flags:
KeyUsage ::= BIT STRING {
digitalSignature (0),
nonRepudiation (1), -- recent editions of X.509 have
-- renamed this bit to contentCommitment
keyEncipherment (2),
dataEncipherment (3),
keyAgreement (4),
keyCertSign (5),
cRLSign (6),
encipherOnly (7),
decipherOnly (8) }
In SSL/TLS, when the server certificate contains a RSA key, then:
either a DHE or ECDHE cipher suite is used, in which case the RSA key
is used for a signature (see section 7.4.3 of RFC 5246: the "Server
Key Exchange" message); this exercises the digitalSignature key usage;
or "plain RSA" is used, with a random value (the 48-byte pre-master
secret) being encrypted by the client with the server's public key
(see section 7.4.7.1 of RFC 5246); this is right in the definition of
the keyEncipherment key usage flag.
dataEncipherment does not apply, because what is encrypted is not
directly meaningful data, but a value which is mostly generated
randomly and used to derive symmetric keys. keyAgreement does not
apply either, because that one is for key agreement algorithms which
are not a case of asymmetric encryption (e.g. Diffie-Hellman). The
keyAgreement usage flag would appear in a certificate which contains a
DH key, not a RSA key. nonRepudiation is not used, because whatever is
signed as part of a SSL/TLS key exchange cannot be used as proof for a
third party (there is nothing in a SSL/TLS tunnel that the client
could record and then use to convince a judge when tring to sue the
server itself; the data which is exchanged within the tunnel is not
signed by the server).
When a ECDSA key is used then "keyAgreement" flag is needed for beeing
ECDH "capable" (as opposed to ephemeral ECDHE)
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ECDH suite handling did not use the EC parameters form the certs
as expected.
Conflicts:
lib/ssl/src/ssl_cipher.erl
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Fix test case code to use keyAgreement for ECDH_ECDSA
Conflicts:
lib/ssl/test/ssl_ECC.erl
lib/ssl/test/ssl_ECC_openssl_SUITE.erl
lib/ssl/test/ssl_to_openssl_SUITE.erl
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When test handling was corrected it was obvious that DTLS ECC handling
was not compleated.
Conflicts:
lib/ssl/src/ssl.erl
lib/ssl/test/Makefile
lib/ssl/test/ssl_ECC.erl
lib/ssl/test/ssl_ECC_SUITE.erl
lib/ssl/test/ssl_ECC_openssl_SUITE.erl
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* sverker/ic/encode-atom-overrun/ERIERL-191/OTP-15160:
ic: Fix buffer overrun bug in oe_ei_encode_atom
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bug exists since OTP-20.3.4
1d3acb70debd134c8346b7e98347171d5cf6fc62
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maint-20
* sverker/erl_interface/simultaneous-connect/OTP-15161:
erl_interface: Fix simultaneous connection setup
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by also accepting status "ok_simultaneous".
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* sverker/kernel/tick-fixes/OTP-15162:
kernel: Fix tick count bug when pending writes
kernel: Send tick to hidden node even if pending writes
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as c-nodes need ticks to send ticks.
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* hans/ssh/sftp_ver4_xfer/ERIERL-199/OTP-15149:
ssh: Fix ssh_xfer decode_ATTR error for Vsn=4
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* hans/ssh/sftp_error_codes/ERIERL-194/OTP-15148:
ssh: Report the signal name if there is an exit-signal to sftpd
ssh: Bug fix sftp error codes
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Report the signal name if the signal error message is ""
Do not report a return code of 0 as an error.
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maint-20
* hasse/syntax_tools/fix_map_type/OTP-15098/ERIERL-177:
syntax_tools: Fix a bug regarding reverting map types.
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* ingela/inets/header-handling/OTP-15092:
inets: Gracefully handle bad headers
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max_headers operated on the individual header length instead of
the total length of all headers. Also headers with empty keys are
now discarded.
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* hans/ssh/reneg_bug_20/OTP-15066:
ssh: Renegotiation -> renegotiate
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* hans/ssh/dh_gex_putty/OTP-15064:
ssh: Fix DH group exchange server bug for PuTTY and others following draft-draft-00 from 2001 and not the rfc4419
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and others following draft-draft-00 from 2001 and not the rfc4419
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* hans/crypto/OPENSSL_NO_EC/OTP-15073:
crypto: Disable test_engine if engine is disabled
crypto: disable engine if OPENSSL_NO_EC* is set If that flag is set, and openssl/engine.h is included, there will be an erro further down in files included by engine.h
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If that flag is set, and openssl/engine.h is included, there will be an erro further down in files included by engine.h
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* ingela/ssl/client-has-no-cert/ERL-599/OTP-15050:
ssl: Prepare for release
ssl: Proper handling of clients that choose to send an empty answer to a certificate request
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answer to a certificate request
Solves ERL-599
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into maint-20
* john/erts/fix-heart-command-overflow/OTP-15034/ERIERL-166:
heart: Use ntohs instead of manual conversion
# Conflicts:
# lib/kernel/test/heart_SUITE.erl
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Multiplying a signed char by 256 is undefined behavior and caused
problems on some platforms when the length was long enough. We
could cast it to an unsigned int to make it work, but it's best not
to reinvent the wheel.
Fixes OTP-15034
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