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-rw-r--r--lib/ssl/src/ssl_handshake.erl15
1 files changed, 9 insertions, 6 deletions
diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl
index f29aa00a60..b538fefe53 100644
--- a/lib/ssl/src/ssl_handshake.erl
+++ b/lib/ssl/src/ssl_handshake.erl
@@ -578,11 +578,10 @@ prf({3,_N}, Secret, Label, Seed, WantedLength) ->
%%--------------------------------------------------------------------
select_hashsign(_, undefined, _Version) ->
{null, anon};
-select_hashsign(undefined, Cert, Version) ->
- #'OTPCertificate'{tbsCertificate = TBSCert} = public_key:pkix_decode_cert(Cert, otp),
- #'OTPSubjectPublicKeyInfo'{algorithm = {_,Algo, _}} = TBSCert#'OTPTBSCertificate'.subjectPublicKeyInfo,
- select_hashsign_algs(undefined, Algo, Version);
-select_hashsign(#hash_sign_algos{hash_sign_algos = HashSigns}, Cert, Version) ->
+%% The signature_algorithms extension was introduced with TLS 1.2. Ignore it if we have
+%% negotiated a lower version.
+select_hashsign(#hash_sign_algos{hash_sign_algos = HashSigns}, Cert, {Major, Minor} = Version)
+ when Major >= 3 andalso Minor >= 3 ->
#'OTPCertificate'{tbsCertificate = TBSCert} =public_key:pkix_decode_cert(Cert, otp),
#'OTPSubjectPublicKeyInfo'{algorithm = {_,Algo, _}} = TBSCert#'OTPTBSCertificate'.subjectPublicKeyInfo,
DefaultHashSign = {_, Sign} = select_hashsign_algs(undefined, Algo, Version),
@@ -600,7 +599,11 @@ select_hashsign(#hash_sign_algos{hash_sign_algos = HashSigns}, Cert, Version) ->
DefaultHashSign;
[HashSign| _] ->
HashSign
- end.
+ end;
+select_hashsign(_, Cert, Version) ->
+ #'OTPCertificate'{tbsCertificate = TBSCert} = public_key:pkix_decode_cert(Cert, otp),
+ #'OTPSubjectPublicKeyInfo'{algorithm = {_,Algo, _}} = TBSCert#'OTPTBSCertificate'.subjectPublicKeyInfo,
+ select_hashsign_algs(undefined, Algo, Version).
%%--------------------------------------------------------------------
-spec select_hashsign_algs(#hash_sign_algos{}| undefined, oid(), ssl_record:ssl_version()) ->