v2fly/common/crypto/internal/chacha_core.generated.go

package internal

import "encoding/binary"


func ChaCha20Block(s *[16]uint32, out []byte, rounds int) {
  var x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15 = s[0],s[1],s[2],s[3],s[4],s[5],s[6],s[7],s[8],s[9],s[10],s[11],s[12],s[13],s[14],s[15]
	for i := 0; i < rounds; i+=2 {
    var x uint32
    
x0+=x4
x=x12^x0
x12=(x << 16) | (x >> (32 - 16))
x8+=x12
x=x4^x8
x4=(x << 12) | (x >> (32 - 12))
x0+=x4
x=x12^x0
x12=(x << 8) | (x >> (32 - 8))
x8+=x12
x=x4^x8
x4=(x << 7) | (x >> (32 - 7))
x1+=x5
x=x13^x1
x13=(x << 16) | (x >> (32 - 16))
x9+=x13
x=x5^x9
x5=(x << 12) | (x >> (32 - 12))
x1+=x5
x=x13^x1
x13=(x << 8) | (x >> (32 - 8))
x9+=x13
x=x5^x9
x5=(x << 7) | (x >> (32 - 7))
x2+=x6
x=x14^x2
x14=(x << 16) | (x >> (32 - 16))
x10+=x14
x=x6^x10
x6=(x << 12) | (x >> (32 - 12))
x2+=x6
x=x14^x2
x14=(x << 8) | (x >> (32 - 8))
x10+=x14
x=x6^x10
x6=(x << 7) | (x >> (32 - 7))
x3+=x7
x=x15^x3
x15=(x << 16) | (x >> (32 - 16))
x11+=x15
x=x7^x11
x7=(x << 12) | (x >> (32 - 12))
x3+=x7
x=x15^x3
x15=(x << 8) | (x >> (32 - 8))
x11+=x15
x=x7^x11
x7=(x << 7) | (x >> (32 - 7))
x0+=x5
x=x15^x0
x15=(x << 16) | (x >> (32 - 16))
x10+=x15
x=x5^x10
x5=(x << 12) | (x >> (32 - 12))
x0+=x5
x=x15^x0
x15=(x << 8) | (x >> (32 - 8))
x10+=x15
x=x5^x10
x5=(x << 7) | (x >> (32 - 7))
x1+=x6
x=x12^x1
x12=(x << 16) | (x >> (32 - 16))
x11+=x12
x=x6^x11
x6=(x << 12) | (x >> (32 - 12))
x1+=x6
x=x12^x1
x12=(x << 8) | (x >> (32 - 8))
x11+=x12
x=x6^x11
x6=(x << 7) | (x >> (32 - 7))
x2+=x7
x=x13^x2
x13=(x << 16) | (x >> (32 - 16))
x8+=x13
x=x7^x8
x7=(x << 12) | (x >> (32 - 12))
x2+=x7
x=x13^x2
x13=(x << 8) | (x >> (32 - 8))
x8+=x13
x=x7^x8
x7=(x << 7) | (x >> (32 - 7))
x3+=x4
x=x14^x3
x14=(x << 16) | (x >> (32 - 16))
x9+=x14
x=x4^x9
x4=(x << 12) | (x >> (32 - 12))
x3+=x4
x=x14^x3
x14=(x << 8) | (x >> (32 - 8))
x9+=x14
x=x4^x9
x4=(x << 7) | (x >> (32 - 7))
}
binary.LittleEndian.PutUint32(out[0:4], s[0]+x0)
binary.LittleEndian.PutUint32(out[4:8], s[1]+x1)
binary.LittleEndian.PutUint32(out[8:12], s[2]+x2)
binary.LittleEndian.PutUint32(out[12:16], s[3]+x3)
binary.LittleEndian.PutUint32(out[16:20], s[4]+x4)
binary.LittleEndian.PutUint32(out[20:24], s[5]+x5)
binary.LittleEndian.PutUint32(out[24:28], s[6]+x6)
binary.LittleEndian.PutUint32(out[28:32], s[7]+x7)
binary.LittleEndian.PutUint32(out[32:36], s[8]+x8)
binary.LittleEndian.PutUint32(out[36:40], s[9]+x9)
binary.LittleEndian.PutUint32(out[40:44], s[10]+x10)
binary.LittleEndian.PutUint32(out[44:48], s[11]+x11)
binary.LittleEndian.PutUint32(out[48:52], s[12]+x12)
binary.LittleEndian.PutUint32(out[52:56], s[13]+x13)
binary.LittleEndian.PutUint32(out[56:60], s[14]+x14)
binary.LittleEndian.PutUint32(out[60:64], s[15]+x15)
}