Datasheet

42.8.12 Galois Hash (GCM mode only)
Name: GHASH
Offset: 0x6C + n*0x04 [n=0..3]
Reset: 0x00000000
Property: PAC Write-Protection
Bit 31 30 29 28 27 26 25 24
GHASH[31:24]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 23 22 21 20 19 18 17 16
GHASH[23:16]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8
GHASH[15:8]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
GHASH[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bits 31:0 – GHASH[31:0] Galois Hash Value
The four 32-bit Hash Word registers GHASHcontain the GHASH value after GF128 multiplication in GCM
mode. Writing a new key to KEYWORD registers causes GHASH to be initialized with zeroes. These
registers can also be programmed.
SAM D5x/E5x Family Data Sheet
AES – Advanced Encryption Standard
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1440