IBM Computer Hardware 2 User Manual download pdf (Page 226)

PKA_Encrypt CCA Release 2.54

rule_array

The rule_array parameter is a pointer to a string variable containing an array of

keywords. The keywords are eight bytes in length, and must be left-justified

and padded on the right with space characters. The rule_array keywords are

shown below:

clear_source_data_length

The clear_source_data_length parameter is a pointer to an integer variable

containing the number of bytes of data in the clear_source_data variable.

When using the PKCS-1.2 keyword, the maximum size allowed is 245 bytes

with a 2048-bit public key. When using the ZERO-PAD keyword, the maximum

size allowed is 256 bytes with a 2048-bit public key.

clear_source_data

The clear_source_data parameter is a pointer to a string variable containing the

input data to be encrypted.

data_structure_length

The data_structure_length parameter is a pointer to an integer variable

containing the number of bytes of data in the data_structure variable. This

value must be zero.

data_structure

The data_structure parameter is a pointer to a string variable. This variable is

currently ignored.

public_key_identifier_length

The public_key_identifier_length parameter is a pointer to an integer variable

containing the number of bytes of data in the public_key_identifier variable.

The maximum size allowed is 2500 bytes.

public_key_identifier

The public_key_identifier parameter is a pointer to a string variable containing

the RSA public-key token, or the label of an RSA public-key token in key

storage, used to encrypt the source data.

target_data_length

The target_data_length parameter is a pointer to an integer variable containing

the number of bytes of data in the target_data variable. On input, this variable

specifies the maximum permissible length of the result. On output, this verb

updates the variable to indicate the length of the returned data. The maximum

size allowed is 256 bytes. The data length will be the same as the size of the

public-key modulus.

Keyword Meaning

Format method (one required)

PKCS-1.2 Specifies the method found in RSA DSI PKCS #1 block type

02 documentation. In the RSA PKCS #1 v2.0 standard, RSA

terminology describes this as the RSAES-PKCS1-v1_5 format.

ZERO-PAD Places the supplied data in the low-order bit positions of a bit

string of the same length as the modulus. As required,

high-order bits are set to zero. Ciphers the resulting bit-string

with the public key.

5-76 IBM 4758 CCA Basic Services, Release 2.54, February 2005

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