Cryptographic processor (CRYP) RM0090
577/1422 Doc ID 018909 Rev 4
Bits 9:8 KEYSIZE[1:0]: Key size selection (AES mode only)
This bitfield defines the bit-length of the key used for the AES cryptographic core.
This bitfield is ‘don’t care’ in the DES or TDES modes.
00: 128 bit key length
01: 192 bit key length
10: 256 bit key length
11: Reserved, do not use this value
Bits 7:6 DATATYPE[1:0]: Data type selection
This bitfield defines the format of data entered in the CRYP_DIN register (refer to
Section 20.3.3: Data type).
00: 32-bit data. No swapping of each word. First word pushed into the IN FIFO
(or popped off the OUT FIFO) forms bits 1...32 of the data block, the second
word forms bits 33...64.
01: 16-bit data, or half-word. Each word pushed into the IN FIFO (or popped off
the OUT FIFO) is considered as 2 half-words, which are swapped with each
other.
10: 8-bit data, or bytes. Each word pushed into the IN FIFO (or popped off the
OUT FIFO) is considered as 4 bytes, which are swapped with each other.
11: bit data, or bit-string. Each word pushed into the IN FIFO (or popped off the
OUT FIFO) is considered as 32 bits (1st bit of the string at position 0), which are
swapped with each other.
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