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The following (top level) OpenSSL public BIGNUM functions check for
the BN_FLG_CONSTTIME:
bn_blind.c:
BN_BLINDING_new()
bn_exp.c:
BN_exp : must not be set for input bignums
! BN_mod_exp : SHOULD be set for any one of input bignums (only) if m is odd
BN_mod_exp_recp: must NOT be set for input bignums
BN_mod_exp_mont: SHOULD be set for any one of input bignums
BN_mod_exp_mont_word: must NOT be set for input bignums
BN_mod_exp_simple: must NOT bet set for input bignums
bn_gcd.c:
! BN_mod_inverse: SHOULD be set for any one of input bignums
bn_lib:
BN_num_bits
! BN_copy
bn_mont.c:
BN_MONT_CTX_set
bn.h:
! BN_num_bytes: Calls BN_num_bits
Relevant files and functions in the files:
Helpers.c
ComputePrivateExponentD:
- BN_dup: -> BN_copy: YES, BN_FLG_CONSTTIME set by caller on P and Q
- BN_sub: no
- BN_add_word: no
- BN_mod_inverse: YES, DONE
InitOpenSSLRSAPublicKey:
- BN_set_word: no
- BN_bin2bn: no
InitOpenSSLRSAPrivateKey:
- BN_bin2bn: no
- BN_div: -> BN_copy: YES, DONE
- BN_is_zero: no
TpmToOsslMath:
OsslToTpmBn:
- BN_num_bytes: need not
- BN_bn2bin: -> BN_num_bytes: need not
BigInitialized:
- BN_bin2bn: no
- BN_copy: YES, DONE
BnModMult:
- BN_mul: no
- BN_div: -> BN_copy: ?
BnMult:
- BN_mul: no
BnDiv:
- BN_div: -> BN_copy: ?
BnGcd: /* FUNCTION IS NOT USED */
- BN_gcd: -> BN_copy, BN_num_bits: YES, DONE
BnModExp:
- BN_mod_exp: YES, DONE
BnModInverse:
- BN_mod_inverse: YES, DONE
Elliptic curve signing :
CryptEccMain.c:
BnEccGenerateKeyPair:
- BnEccModMult: YES, DONE (we have control over random number bnD)
called by BnSignEcSchnorr
called by BnSignEcdsa (if OpenSSL function not used)
CryptEccSignature.c:
BnEccSignSM2:
- BnEccModMult: YES, DONE (we have control over random number bnK)
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