Diffie-Hellman public key objects

Diffie-Hellman public key objects (object class CKO_PUBLIC_KEY, key type CKK_DH) hold Diffie-Hellman public keys. The following table defines the Diffie-Hellman public key object attributes, in addition to the common attributes listed in Table 15 , Table 19 , Table 25 , and Table 26 :

Table 31, Diffie-Hellman Public Key Object Attributes

Attribute	Data type	Meaning
CKA_PRIME^1,3	Big integer	Prime p
CKA_BASE^1,3	Big integer	Base g
CKA_VALUE^1,4	Big integer	Public value y

The CKA_PRIME and CKA_BASE attribute values are collectively the "Diffie-Hellman domain parameters". Depending on the token, there may be limits on the length of the key components. See PKCS #3 for more information on Diffie-Hellman keys.

The following is a sample template for creating a Diffie-Hellman public key object:

CK_OBJECT_CLASS class = CKO_PUBLIC_KEY;
CK_KEY_TYPE keyType = CKK_DH;
CK_UTF8CHAR label[] = "A Diffie-Hellman public key object";
CK_BYTE prime[] = {...};
CK_BYTE base[] = {...};
CK_BYTE value[] = {...};
CK_BBOOL true = TRUE;
CK_ATTRIBUTE template[] = {
{CKA_CLASS, &class, sizeof(class)},
{CKA_KEY_TYPE, &keyType, sizeof(keyType)},
{CKA_TOKEN, &true, sizeof(true)},
{CKA_LABEL, label, sizeof(label)-1},
{CKA_PRIME, prime, sizeof(prime)},
{CKA_BASE, base, sizeof(base)},
{CKA_VALUE, value, sizeof(value)}
};