I’m running Python version 3.8.2 and using pycryptodome version 3.9.9 to import an ECC private key in PEM encoding for later signing some data. The following EC private key is a sample key, and I’m using it for several cross-platform projects [e.g. Java, PHP, NodeJs] and it works without any problem (it’s a NIST P-256 / secp256r1-key) key: ecprivatekey.pem: Using