Need somebody who is expert in handling PKCS7, Digital Signatures, Cryptography etc and can create RESTful API for the same.
Rest details upon contact.
I have many experiences in making cryptography libraries or APIs.
PKCS7 is called CMS(Cryptographic Message Syntax) now.
If you want to handle this, you already know about ASN.1, RSA, DSA Algorithm, etc.
Please tell me what you want to do.