Freescale Semiconductor MCF5480 - Manual (Page 696)

MCF548x Reference Manual, Rev. 3
22-94 Freescale Semiconductor
copy the last 8 bytes of the ciphertext to the Security Association Database Entry for this particular session
before transmitting the packet.
Table 22-95 lists typical DEU/HMAC multi-function descriptor header values.
Table 22-94. Descriptor for Dynamic Multi-Function Encryption
Field Name Value/Type Description
Header Table 22-95 Header common to several descriptors (TYPE 0010)
LEN_1 HMAC Key Length Number of bytes in HMAC Key
PTR_1 HMAC Key Pointer Address of HMAC Key
LEN_2 HMAC Data Length Number of bytes to be HMAC’d
PTR_2 HMAC Data Pointer Address of data to be HMAC’d
LEN_3 Key Length Number of bytes in Key (8, 16, 24, or 32 bytes)
PTR_3 Key Pointer Address of Key
LEN_4 IV Length Number of bytes in IV (8, 24, or 56)
PTR_4 IV Pointer Address of IV
LEN_5 Data In Length Bytes of plaintext to be encrypted
PTR_5 Data In Pointer Address of plaintext to be encrypted
LEN_6 Data Out Length Bytes of output data (should be equal to length of data in)
PTR_6 Data Out Pointer Address where output data is to be written
LEN_7 HMAC Out Length Number of bytes HMAC output (16, 20 or 32 bytes)
PTR_7 HMAC Out Pointer Address where hash output is to be written
PTR_NEXT Next Descriptor Pointer Pointer to next data packet descriptor
Table 22-95. Typical Header Values for Dynamic Multi-Function DEU Descriptors
Header Value E/C S/T E/D Algorithm HMAC Pad
0x20131D20 ECB Single DES Encrypt SHA256 Yes Yes
0x20131E20 ECB Single DES Encrypt MD5 Yes Yes
0x20131C20 ECB Single DES Encrypt SHA Yes Yes
0x20531D20 ECB Triple DES Encrypt SHA256 Yes Yes
0x20531E20 ECB Triple DES Encrypt MD5 Yes Yes
0x20531C20 ECB Triple DES Encrypt SHA Yes Yes
0x20331D20 CBC Single DES Encrypt SHA256 Yes Yes
0x20331E20 CBC Single DES Encrypt MD5 Yes Yes
0x20331C20 CBC Single DES Encrypt SHA Yes Yes
0x20731D20 CBC Triple DES Encrypt SHA256 Yes Yes