SpinalHDL—小练习(四)

本系列适合新手在对Scala及SpinalHDL有初步了解后做练手使用。

题目

在AES算法中，每轮变换均有一次SBOX查找，用SpinalHDL通过LUT实现SBOX功能。SBOX查找表内容如下：

实现一

import spinal.core._
case class example4() extends Component{
  val io=new Bundle{
    val dataIn=in  UInt(8 bits)
    val dataOut=out UInt(8 bits)
  }
  val sbox=new Area{
    val sboxLut=Array(
        0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5,
        0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
        0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0,
        0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
        0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC,
        0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
        0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A,
        0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
        0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0,
        0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
        0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B,
        0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
        0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85,
        0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
        0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5,
        0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
        0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17,
        0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
        0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88,
        0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
        0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C,
        0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
        0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9,
        0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
        0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6,
        0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
        0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E,
        0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
        0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94,
        0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
        0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68,
        0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16).map(U(_,8 bits))
    io.dataOut:=Vec(sboxLut).read(io.dataIn)
  }
}

Key:
Vec的read方法使用

实现二

case class example4_1() extends Component{
  val io=new Bundle{
    val dataIn=in  UInt(8 bits)
    val dataOut=out UInt(8 bits)
  }
  val sbox=new Area{
    val sboxLut=Array(
      0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5,
      0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
      0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0,
      0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
      0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC,
      0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
      0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A,
      0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
      0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0,
      0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
      0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B,
      0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
      0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85,
      0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
      0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5,
      0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
      0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17,
      0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
      0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88,
      0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
      0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C,
      0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
      0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9,
      0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
      0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6,
      0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
      0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E,
      0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
      0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94,
      0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
      0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68,
      0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16)
    switch(io.dataIn){
      for(index<-0 until sboxLut.length){
        is(index){
          io.dataOut:=sboxLut(index)
        }
      }
    }
  }
}

Key:
switch的使用及在switch中使用for循环。

END

作者：玉骐
原文链接：https://mp.weixin.qq.com/s/FvD198uiP2KqILoOoEjHEA
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• SpinalHDL—小练习(二)
• SpinalHDL—小练习(三)

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