OpenSSL

https://www.openssl.org/

Show error string

Normally you’ll get error:0406506C:rsa routines:func(101):reason(108), but what does it mean?

In order to show the useful error message, open terminal and type the following command

$ openssl errstr 0406506C
error:0406506C:rsa routines:RSA_EAY_PRIVATE_DECRYPT:data greater than mod len

Reference:

• PEM_read_RSAPrivateKey returns “Illegal Seek” when decrypting using OpenSSL libs in C