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Add support for constant-time decryption of PKCS#1 v1.5-encoded session keys #1445
Merged
larabr
merged 8 commits into
openpgpjs:main
from
larabr:config-pkcs1-decrypt-constant-time
Jan 19, 2022
Merged
Add support for constant-time decryption of PKCS#1 v1.5-encoded session keys #1445
larabr
merged 8 commits into
openpgpjs:main
from
larabr:config-pkcs1-decrypt-constant-time
Jan 19, 2022
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larabr
commented
Dec 1, 2021
@@ -473,11 +476,14 @@ async function nodeDecrypt(data, n, e, d, p, q, u) { | |||
try { | |||
return new Uint8Array(nodeCrypto.privateDecrypt(key, data)); | |||
} catch (err) { | |||
if (randomPayload) { |
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This is not ideal, but I don't think we can do better than this
twiss
reviewed
Dec 1, 2021
Co-authored-by: Daniel Huigens <d.huigens@protonmail.com>
twiss
reviewed
Dec 2, 2021
twiss
approved these changes
Dec 2, 2021
This was referenced Jan 17, 2022
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Implement optional constant-time decryption flow to hinder Bleichenbacher-like attacks against RSA- and ElGamal public-key encrypted session keys.
Changes:
config.constantTimePKCS1Decryption
to enable the constant-time processing (defaults tofalse
). The constant-time option is off by default since it has measurable performance impact on message decryption, and it is only helpful in specific application scenarios (more info below).config.constantTimePKCS1DecryptionSupportedSymmetricAlgorithms
(defaults to the AES algorithms). The set of supported ciphers is restricted by default since the number of algorithms negatively affects performance.Bleichenbacher-like attacks are of concern for applications where both of the following conditions are met: