Securing elliptic curve digital signature algorithm (ecdsa) nonce communicated between symmetric and asymmetric cryptographic co-processors in a heterogeneous system

A processor comprising:

• a symmetric portion configured to generate Boolean masked shares, wherein the Boolean masked shares constitute a nonce;
• and
• an asymmetric portion coupled to the symmetric portion, the asymmetric portion configured to produce an Elliptic Curve Digital Signature Algorithm (ECDSA) signature based, at least in part, upon the nonce.

A method, comprising:

• receiving, by an asymmetric portion of a processor from a symmetric portion of the processor, first and second Boolean masked shares;
• and
• producing a digital signature based, at least in part, upon the first and second Boolean masked shares.