fix get attr by index
fix get attr by index

Digt/trusted-crypto,Digt/trusted-crypto,TrustedPlus/crypto,Digt/trusted-crypto,TrustedPlus/trusted-crypto,TrustedPlus/crypto,TrustedPlus/crypto,TrustedPlus/trusted-crypto,Digt/trusted-crypto,Digt/trusted-crypto,TrustedPlus/crypto,TrustedPlus/trusted-crypto,TrustedPlus/crypto,TrustedPlus/trusted-crypto,TrustedPlus/trusted-crypto