X9.42 Diffie-Hellman domain parameters objects

X9.42 Diffie-Hellman domain parameters objects (object class CKO_DOMAIN_PARAMETERS, key type CKK_X9_42_DH) hold X9.42 Diffie-Hellman domain parameters. The following table defines the X9.42 Diffie-Hellman domain parameters object attributes, in addition to the common attributes defined for this object class:

Table 65, X9.42 Diffie-Hellman Domain Parameters Object Attributes

Attribute	Data type	Meaning
CKA_PRIME^1,4	Big integer	Prime p (>= 1024 bits, in steps of 256 bits)
CKA_BASE^1,4	Big integer	Base g
CKA_SUBPRIME^1,4	Big integer	Subprime q (>= 160 bits)
CKA_PRIME_BITS^2,3	CK_ULONG	Length of the prime value.
CKA_SUBPRIME_BITS^2,3	CK_ULONG	Length of the subprime value.

The CKA_PRIME, CKA_BASE and CKA_SUBPRIME attribute values are collectively the "X9.42 Diffie-Hellman domain parameters". Depending on the token, there may be limits on the length of the domain parameters components. See the ANSI X9.42 standard for more information on X9.42 Diffie-Hellman domain parameters.

The following is a sample template for creating a X9.42 Diffie-Hellman domain parameters object:

CK_OBJECT_CLASS class = CKO_DOMAIN_PARAMETERS;
CK_KEY_TYPE keyType = CKK_X9_42_DH;
CK_UTF8CHAR label[] = "A X9.42 Diffie-Hellman domain parameters object";
CK_BYTE prime[] = {...};
CK_BYTE base[] = {...};
CK_BYTE subprime[] = {...};
CK_BBOOL true = CK_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_SUBPRIME, subprime, sizeof(subprime)},
};