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crypto: warn on invalid authentication tag length #17566

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tniessen wants to merge 6 commits into from
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crypto: warn on invalid authentication tag length #17566

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c5d0372
test: use valid authentication tag length
tniessen Dec 9, 2017
fc6c652
crypto: warn on invalid authentication tag length
tniessen Dec 9, 2017
54d49c1
[squash] remove GCM check
tniessen Dec 10, 2017
bbf356e
[squash] fix FIPS failure
tniessen Dec 10, 2017
0b5c90f
[squash] fix FIPS (again)
tniessen Dec 10, 2017
e694393
[squash] add dot
tniessen Dec 11, 2017
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[squash] remove GCM check
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@tniessen
tniessen committed Dec 10, 2017
commit 54d49c1c473f3900330c282dc8ab7dfa83f677b2
13 changes: 6 additions & 7 deletions src/node_crypto.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -3767,14 +3767,13 @@ void CipherBase::SetAuthTag(const FunctionCallbackInfo<Value>& args) {
return args.GetReturnValue().Set(false);
}

// Restrict GCM tag lengths according to NIST 800-38d, page 9
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@bnoordhuis bnoordhuis Dec 11, 2017

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Dot at the end.

unsigned int tag_len = Buffer::Length(args[0]);
if (EVP_CIPHER_CTX_mode(cipher->ctx_) == EVP_CIPH_GCM_MODE) {
if (tag_len > 16 || (tag_len < 12 && tag_len != 8 && tag_len != 4)) {
ProcessEmitWarning(cipher->env(),
"Permitting authentication tag lengths of %u bytes is deprecated. "
"Valid GCM tag lengths are 4, 8, 12, 13, 14, 15, 16.",
tag_len);
}
if (tag_len > 16 || (tag_len < 12 && tag_len != 8 && tag_len != 4)) {
ProcessEmitWarning(cipher->env(),
"Permitting authentication tag lengths of %u bytes is deprecated. "
"Valid GCM tag lengths are 4, 8, 12, 13, 14, 15, 16.",
tag_len);
}

// Note: we don't use std::max() here to work around a header conflict.
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