> grep -r ASN1_TIME\( ~/openssl/openssl/ > /home/ajay/openssl/openssl/crypto/asn1/a_time.c:int i2d_ASN1_TIME(ASN1_TIME *a, unsigned char **pp) > How to search for such symbols in the cloned source-code? Much of the ASN1 data structures are created by macros and it will not be immediately obvious to newcomers how it works. Your best bet is to use "nm -o" on the library and find the file, and then work backward from there.