Espressif ESP32 Technical Reference Manual page 594

23 SHA Accelerator (SHA)
31
SHA_SHA256_LOAD Write 1 to finish the SHA-256 operation to calculate the final message hash.
(WO)
31
SHA_SHA256_BUSY SHA-256 operation status: 1 if the SHA accelerator is processing data, 0 if it
is idle. (RO)
31
SHA_SHA384_START Write 1 to start an SHA-384 operation on the first message block. (WO)
Espressif Systems
Register 23.8. SHA_SHA256_LOAD_REG (0x098)
0x00000000
Register 23.9. SHA_SHA256_BUSY_REG (0x09C)
0x00000000
Register 23.10. SHA_SHA384_START_REG (0x0A0)
0x00000000
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ESP32 TRM (Version 5.2)