sha1p

SHA1 Parity

SHA1P <Qd>, <Sn>, <Vm>.<T>

SHA1 hash update (Parity function).

Pseudocode Operation

T ← SHA1_Parity(Sn)
Qd ← SHA1_Update_P(Qd, T, Vm)

Example

SHA1P q0, s1, v2.4s.T

Encoding

Binary Layout

01011110

31:24

00

23:22

0

21

Rm

20:16

0

15

001

14:12

00

11:10

Rn

9:5

Rd

4:0

 

Format Crypto

Opcode 0x5E001000

Extension Crypto

Operands

• Qd
  State
• Sn
  Hash
• Vm
  Data

Related

Other forms of sha1p

• sha1p SHA1 Parity (A32)

More in Crypto

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x5E001000	SHA1P <Qd>, <Sn>, <Vm>.4S		A64		01011110 | 00 | 0 | Rm | 0 | 001 | 00 | Rn | Rd

Description

SHA1 hash update (parity).

Operation

AArch64.CheckFPAdvSIMDEnabled();

bits(128) x = V[d, 128];
bits(32) y = V[n, 32];    // Note: 32 not 128 bits wide
bits(128) w = V[m, 128];
bits(32) t;

for e = 0 to 3
    t = SHAparity(x<63:32>, x<95:64>, x<127:96>);
    y = y + ROL(x<31:0>, 5) + t + Elem[w, e, 32];
    x<63:32> = ROL(x<63:32>, 30);
    <y, x> = ROL(y:x, 32);
V[d, 128] = x;