CKM_SEED_CBC_PAD

Supported Operations

Encrypt and Decrypt	Yes
Sign and Verify	No
SignRecover and VerifyRecover	No
Digest	No
Generate Key/Key-Pair	No
Wrap and Unwrap	Yes
Derive	No
FIPS-approved	No

Key Size Range (bytes) and Parameters

Minimum	16
FIPS Minimum	N/A
Maximum	16
Parameter	16 bytes

Description

SEED-CBC with PKCS padding, denoted CKM_SEED_CBC_PAD, is a mechanism for single and multiple part encryption and decryption; key wrapping; and key unwrapping, based on the KISA (Korean Information Security Agency) SEED specification, cipher-block chaining mode and the block cipher padding method detailed in PKCS #7.

It has a single parameter; a 16-byte initialization vector.

The PKCS padding in this mechanism allows the length of the plaintext value to be recovered from the ciphertext value. Therefore, when unwrapping keys with this mechanism, no value should be specified for the CKA_VALUE_LEN attribute.

In addition to being able to wrap and unwrap secret keys, this mechanism can wrap and unwrap RSA, Diffie-Hellman, X9.42 Diffie-Hellman, and DSA private keys.  

Constraints on key types and the length of data are summarized in the following table. The data length constraints do not apply to the wrapping and unwrapping of private keys.

Table 1: SEED-CBC with PKCS Padding: Key and Data Length

Function	Key Tpe	Input Length	Output Length
C_Encrypt	CKK_SEED	Any	This is the input length plus one, rounded up to a multiple of the block size.
C_Decrypt	CKK_SEED	Multiple of block size	Between 1 and block size bytes shorter than input length.
C_WrapKey	CKK_SEED	Any	This is the input length plus one, rounded up to a multiple of the block size.
C_UnwrapKey	CKK_SEED	Multiple of block size	Between 1 and block length bytes shorter than input length.

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