Cryptographic processor (CRYP) RM0090
712/1731 DocID018909 Rev 11
• DES/TDES
– Direct implementation of simple DES algorithms (a single key, K1, is used)
– Supports the ECB and CBC chaining algorithms
– Supports 64-, 128- and 192-bit keys (including parity)
– 2 × 32-bit initialization vectors (IV) used in the CBC mode
– 16 HCLK cycles to process one 64-bit block in DES
– 48 HCLK cycles to process one 64-bit block in TDES
• Common to DES/TDES and AES
– IN and OUT FIFO (each with an 8-word depth, a 32-bit width, corresponding to 4
DES blocks or 2 AES blocks)
– Automatic data flow control with support of direct memory access (DMA) (using 2
channels, one for incoming data the other for processed data)
– Data swapping logic to support 1-, 8-, 16- or 32-bit data
192b 1616162810 16 161416 29 16
256b 1818183210 18 181618 33 18
Table 111. Number of cycles required to process each 128-bit block
(STM32F43xxx)
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