Dear team The API FIPS_selftest() is failing . The content of the file /proc/sys/crypto/fips_enabled is 1 I have executed the below mentioned code The code is #include "stdio.h" int main() { int ret=0; ret=FIPS_mode(); printf("\nFIPS_mode = %u \n",ret); ret=FIPS_selftest(); printf("\nFIPS_selftest=%u \n",ret); ERR_print_errors_fp(stderr); } Output is " FIPS_mode = 1 FIPS_selftest=0 140091346814640:error:0607B0A3:lib(6):func(123):reason(163):evp_enc.c:313: 140091346814640:error:2D06F065:lib(45):func(111):reason(101):fips_des_selftest.c:134: " Looks like flag EVP_CIPH_FLAG_FIPS is not set for the cipher returned by EVP_des_ede_ecb() . I am using openssl-1.0.2k-19.el7.x86_64 on "CentOS Linux release 7.6.1810 (Core)" Please let me know you thoughts on this Thanks and Regards Akshar