![]() | Cryptographic Token Interface Standard |
PKCS#11 |
DSA private key objects (object class CKO_PRIVATE_KEY, key type CKK_DSA) hold DSA private keys. The following table defines the DSA private key object attributes, in addition to the common attributes defined for this object class:
Table 218, DSA Private Key Object Attributes
Attribute | Data type | Meaning |
CKA_PRIME1,4,6 | Big integer | Prime p (512 to 1024 bits, in steps of 64 bits) |
CKA_SUBPRIME1,4,6 | Big integer | Subprime q (160 bits) |
CKA_BASE1,4,6 | Big integer | Base g |
CKA_VALUE1,4,6,7 | Big integer | Private value x |
- 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.
Note that when generating a DSA private key, the DSA domain parameters are not specified in the key's template. This is because DSA private keys are only generated as part of a DSA key pair, and the DSA domain parameters for the pair are specified in the template for the DSA public key.
The following is a sample template for creating a DSA private key object:
CK_OBJECT_CLASS class = CKO_PRIVATE_KEY; CK_KEY_TYPE keyType = CKK_DSA; CK_UTF8CHAR label[] = "A DSA private key object"; CK_BYTE subject[] = {...}; CK_BYTE id[] = {123}; 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_SUBJECT, subject, sizeof(subject)}, {CKA_ID, id, sizeof(id)}, {CKA_SENSITIVE, &true, sizeof(true)}, {CKA_SIGN, &true, sizeof(true)}, {CKA_PRIME, prime, sizeof(prime)}, {CKA_SUBPRIME, subprime, sizeof(subprime)}, {CKA_BASE, base, sizeof(base)}, {CKA_VALUE, value, sizeof(value)} };