ATAES132-SH-EQ Atmel, ATAES132-SH-EQ Datasheet - Page 51
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ATAES132-SH-EQ
Manufacturer Part Number
ATAES132-SH-EQ
Description
EEPROM AES 32Kbit EE SPI
Manufacturer
Atmel
Datasheet
1.ATAES132-SH-EQ.pdf
(166 pages)
Specifications of ATAES132-SH-EQ
Rohs
yes
Maximum Clock Frequency
10 MHz
Operating Supply Voltage
6 V
Maximum Operating Temperature
- 40 C to + 85 C
Mounting Style
SMD/SMT
Package / Case
SOIC-8
Interface Type
SPI
Factory Pack Quantity
2300
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7.15.
KeyImport Command
The KeyImport command accepts 16 bytes of ciphertext, decrypts the key, verifies the MAC, and stores the key in the key
memory or in the VolatileKey register. The source of the encrypted key can be the KeyExport command or the KeyCompute
command.
If TargetKeyID specifies that the target key is stored in the Key Memory:
If KeyConfig[decrypt KeyID].AuthKey is 1b, then prior authentication is required using the KeyID stored in KeyConfig[decrypt
KeyID].LinkPointer.
If TargetKeyID specifies that the target key is VolatileKey: (See Section 4.3)
If KeyConfig[DKeyID].AuthKey is 1b, then prior authentication is required using the KeyID stored in
KeyConfig[DKeyID].LinkPointer.
To use this command, the nonce must be identical on both devices (see Section 7.21.1) and the MacCount must have the
same value. Both devices must also contain identical key values, but it is not necessary for the encrypt KeyID on the origin
device to match the decrypt KeyID on the destination device. In this section, the device which encrypts the key and generates
the MAC is referred to as the origin device – the device checking the MAC is referred to as the destination device.
If Mode bit 5, 6, or 7 is 1b, then the associated usage counter, SerialNum register value, or the first four bytes of the
SmallZone register in the SecondBlock field must match the values on the origin device. The ManufacturingID register must
be identical on both devices, since it is always included in the MAC calculation.
A valid nonce is required to run the KeyImport command. If the KeyConfig[KeyID].RandomNonce bit is 1b for the decrypt key,
then the nonce must be random.
•
•
•
•
•
KeyConfig[TargetKeyID].ImportOK bit must be 1b
KeyConfig[TargetKeyID].LinkPointer contains the decrypt KeyID
The KeyImport command DKeyID field value is ignored
KeyConfig[DKeyID].Parent must be 1b
The KeyImport command DKeyID field contains the decrypt KeyID
Atmel ATAES132 Preliminary Datasheet
8760A−CRYPTO−5/11
51
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