Cryptoki: a cryptographic Token Interface
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pkcs11-base-v2.40-cos01
11.25.3. MD5-HMACThe MD5-HMAC mechanism, denoted CKM_MD5_HMAC, is a special case of the general-length MD5-HMAC mechanism in Section . It has no parameter, and always produces an output of length 16. 11.25.4. MD5 key derivationMD5 key derivation, denoted CKM_MD5_KEY_DERIVATION, is a mechanism which provides the capability of deriving a secret key by digesting the value of another secret key with MD5. The value of the base key is digested once, and the result is used to make the value of derived secret key. If no length or key type is provided in the template, then the key produced by this mechanism will be a generic secret key. Its length will be 16 bytes (the output size of MD5). If no key type is provided in the template, but a length is, then the key produced by this mechanism will be a generic secret key of the specified length. If no length was provided in the template, but a key type is, then that key type must have a well-defined length. If it does, then the key produced by this mechanism will be of the type specified in the template. If it doesn’t, an error will be returned. If both a key type and a length are provided in the template, the length must be compatible with that key type. The key produced by this mechanism will be of the specified type and length. If a DES, DES2, DES3, or CDMF key is derived with this mechanism, the parity bits of the key will be set properly. If the requested type of key requires more than 16 bytes, an error is generated. This mechanism has the following rules about key sensitivity and extractability: The CKA_SENSITIVE and CKA_EXTRACTABLE attributes in the template for the new key can both be specified to be either TRUE or FALSE. If omitted, these attributes each take on some default value. If the base key has its CKA_ALWAYS_SENSITIVE attribute set to FALSE, then the derived key will as well. If the base key has its CKA_ALWAYS_SENSITIVE attribute set to TRUE, then the derived key has its CKA_ALWAYS_SENSITIVE attribute set to the same value as its CKA_SENSITIVE attribute. Similarly, if the base key has its CKA_NEVER_EXTRACTABLE attribute set to FALSE, then the derived key will, too. If the base key has its CKA_NEVER_EXTRACTABLE attribute set to TRUE, then the derived key has its CKA_NEVER_EXTRACTABLE attribute set to the opposite value from its CKA_EXTRACTABLE attribute. Download 360.55 Kb. Share with your friends:
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