PKCS#11 v2.20 in not clear on the format of the public key of the other party
pased during ECDH key derivation. Some implementations (OpenSC) pass just the value
of the public key (RAW), while others (SoftHSM) pass an ASN.1 DER encoded OCTET_STRING.
PKCS$11 v2.40 points out this problem and says implementations must support the
RAW format and may also support the DER format.
To allow pkcs11-tool.c to work with ECDH derivation and using the current libSoftHSM2.so
a new parameter was added to pkcs11-tool, --derive-pass-der.
Also added to teh template fot the new key were:
CKA_SENSITIVE = false
CKA_EXTRACTABLE = true
CKA_VALUE_LEN = size of key to be derived.
OpenSC currently only support derivation of ECDH session keys, (CKA_TOKEN = false)
The derived key must be CK_KEY_TYPE = CKK_GENERIC_SECRET
Additional changes could be made to support AES or DES3 keys.
It is not clear if there is a need to support CKA_TOKEN = true which says the
derived key must be on the hardware token. For ECDH, these keys are short lived.
On branch pkcs11-tool-simple-ecdh
Changes to be committed:
modified: src/tools/pkcs11-tool.c
3ff7309520