sha1h

SHA1 Hash Update (A32)

SHA1H.32 <Qd>, <Qm>

Updates SHA1 hash state.

Pseudocode Operation

Qd[127:96] ← ROTATE_LEFT(Qm[127:96], 30)
Qd[95:64] ← ROTATE_LEFT(Qm[95:64], 30)
Qd[63:32] ← ROTATE_LEFT(Qm[63:32], 30)
Qd[31:0] ← ROTATE_LEFT(Qm[31:0], 30)

Example

SHA1H.32 q0, q2

Encoding

Binary Layout

11110011

31:24

1

23

D

22

11

21:20

10

19:18

10

17:16

Vd

15:12

00000

11:7

Q

6

M

5

1

4

Vm

3:0

 

Format Crypto 2-Reg

Opcode 0xF3B102C0

Extension Crypto

Operands

• Qd
  Destination 128-bit SIMD register
• Qm
  Second source 128-bit SIMD register

Related

Other forms of sha1h

• sha1h SHA1 Hash Update (A64)

More in Crypto

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x5E280800	SHA1H <Sd>, <Sn>		A64		01011110 | 00 | 10100 | 00000 | 10 | Rn | Rd

Description

SHA1 fixed rotate.

Operation

AArch64.CheckFPAdvSIMDEnabled();

bits(32) operand = V[n, 32];    // read element [0] only,  [1-3] zeroed
V[d, 32] = ROL(operand, 30);