Makes modular exponentiation constant time by default.#128
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ddealmei wants to merge 2 commits intojustmoon:mainfrom
Open
Makes modular exponentiation constant time by default.#128ddealmei wants to merge 2 commits intojustmoon:mainfrom
ddealmei wants to merge 2 commits intojustmoon:mainfrom
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JeffroMF
approved these changes
Sep 3, 2025
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Calling BN_mod_exp with a small base, and no constant time flag fallback on an insecure implementation with OpenSSL. If the exponent is related to a secret value, the resulting leakage may compromise the secret.
A simple fix is to set the appropriate flag before computing the modular exponentiation.