SHA256SUM0

SHA-256 Sum0

SHA256SUM0 rd, rs1

Performs the Sum0 transformation function for SHA-256.

Encoding

Binary Layout

000100000000

31:20

rs1

19:15

001

14:12

rd

11:7

0010011

6:0

 

Format I-Type

Opcode 0x10001013

Extension Zk

Operands

• rd
  Destination register (integer)
• rs1
  Source

Example

SHA256SUM0 x10, x11

// SHA-256 calculation.

Related

More in Zk

Reference

View in RISC-V Unprivileged ISA Specification ↗ RISC-V ISA Manual

Description

SHA256SUM0 computes the sum-0 mixing function (Sigma-0 capital) for SHA-256 message scheduling.

Operation

R[rd] = ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22);