Cryptographic Token Interface Standard

PKCS#11

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DSA public key objects

DSA public key objects (object class CKO_PUBLIC_KEY, key type CKK_DSA) hold DSA public keys. The following table defines the DSA public key object attributes, in addition to the common attributes defined for this object class:

Table 217, DSA Public Key Object Attributes

Attribute	Data type	Meaning
CKA_PRIME1,3	Big integer	Prime p (512 to 1024 bits, in steps of 64 bits)
CKA_SUBPRIME1,3	Big integer	Subprime q (160 bits)
CKA_BASE1,3	Big integer	Base g
CKA_VALUE1,4	Big integer	Public value y

^- Refer to Table 15 for footnotes

The CKA_PRIME, CKA_SUBPRIME and CKA_BASE attribute values are collectively the "DSA domain parameters". See FIPS PUB 186-2 for more information on DSA keys.

The following is a sample template for creating a DSA public key object:

CK_OBJECT_CLASS class = CKO_PUBLIC_KEY;
CK_KEY_TYPE keyType = CKK_DSA;
CK_UTF8CHAR label[] = "A DSA public key object";
CK_BYTE prime[] = {...};
CK_BYTE subprime[] = {...};
CK_BYTE base[] = {...};
CK_BYTE value[] = {...};
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_SUBPRIME, subprime, sizeof(subprime)},
{CKA_BASE, base, sizeof(base)},
{CKA_VALUE, value, sizeof(value)}
};

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RSA Security Inc. Public-Key Cryptography Standards - PKCS#11 - v230