// Copyright 2019 Intel Corporation.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package crypto_mb

//based on crypto/hmac

import (
	"fmt"
	"testing"
)

type hmacTest struct {
	hash      func() MultiHash
	key       []byte
	in        []byte
	out       string
	size      int
	blocksize int
	vecsize   int
}

var hmacTests = []hmacTest{
	// Tests from US FIPS 198
	// http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf
	{
		New,
		[]byte{
			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
			0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
			0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
			0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
			0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
			0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
			0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
			0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
		},
		[]byte("Sample #1"),
		"4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a",
		SizeSHA1,
		BlockSizeSHA1,
		vecSize,
	},
	{
		New,
		[]byte{
			0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
			0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
			0x40, 0x41, 0x42, 0x43,
		},
		[]byte("Sample #2"),
		"0922d3405faa3d194f82a45830737d5cc6c75d24",
		SizeSHA1,
		BlockSizeSHA1,
		vecSize,
	},
	{
		New,
		[]byte{
			0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
			0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
			0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
			0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
			0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
			0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
			0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
			0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
			0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
			0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
			0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
			0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
			0xb0, 0xb1, 0xb2, 0xb3,
		},
		[]byte("Sample #3"),
		"bcf41eab8bb2d802f3d05caf7cb092ecf8d1a3aa",
		SizeSHA1,
		BlockSizeSHA1,
		vecSize,
	},

	// Tests from http://csrc.nist.gov/groups/ST/toolkit/examples.html
	// (truncated tag tests are left out)
	{
		New,
		[]byte{
			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
			0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
			0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
			0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
			0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
			0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
			0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
			0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
		},
		[]byte("Sample message for keylen=blocklen"),
		"5fd596ee78d5553c8ff4e72d266dfd192366da29",
		SizeSHA1,
		BlockSizeSHA1,
		vecSize,
	},
	{
		New,
		[]byte{
			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
			0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
			0x10, 0x11, 0x12, 0x13,
		},
		[]byte("Sample message for keylen<blocklen"),
		"4c99ff0cb1b31bd33f8431dbaf4d17fcd356a807",
		SizeSHA1,
		BlockSizeSHA1,
		vecSize,
	},
	{
		New,
		[]byte{
			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
			0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
			0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
			0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
			0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
			0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
			0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
			0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
			0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
			0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
			0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
			0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
			0x60, 0x61, 0x62, 0x63,
		},
		[]byte("Sample message for keylen=blocklen"),
		"2d51b2f7750e410584662e38f133435f4c4fd42a",
		SizeSHA1,
		BlockSizeSHA1,
		vecSize,
	},
}

func TestHMAC(t *testing.T) {
	for i, tt := range hmacTests {
		par2 := make([][]byte, tt.vecsize)
		for i := range par2 {
			par2[i] = make([]byte, len(tt.in))
			copy(par2[i], tt.in)
		}
		h := NewHmac(tt.hash, tt.key)
		if s := h.Size(); s != tt.size {
			t.Errorf("Size: got %v, want %v", s, tt.size)
		}
		if b := h.BlockSize(); b != tt.blocksize {
			t.Errorf("BlockSize: got %v, want %v", b, tt.blocksize)
		}
		for j := 0; j < 2; j++ {
			n := h.Write(par2)
			if n != len(par2[0]) {
				t.Errorf("test %d.%d: Write(%d) = %d", i, j, len(tt.in), n)
				continue
			}

			// Repetitive Sum() calls should return the same value
			for k := 0; k < 2; k++ {
				s := h.Sum(nil)
				for n := 0; n < tt.vecsize; n++ {
					sum := fmt.Sprintf("%x", s[n])
					if sum != tt.out {
						t.Errorf("test %d.%d.%d: have %s want %s\n", i, j, k, sum, tt.out)
					}
				}
			}

			// Second iteration: make sure reset works.
			h.Reset()
		}
	}
}

func BenchmarkHMACSHA1_1K(b *testing.B) {
	key := make([]byte, 32)
	buf := make([]byte, 1024)
	par2 := make([][]byte, 8)
	for i := range par2 {
		par2[i] = make([]byte, len(buf))
		copy(par2[i], buf)
	}
	h := NewHmac(New, key)
	b.SetBytes(int64(len(buf) * 8))
	for i := 0; i < b.N; i++ {
		h.Write(par2)
		h.Reset()
		mac := h.Sum(nil)
		par2[0][0] = mac[0][0]
	}
}

func BenchmarkHMACSHA1_320(b *testing.B) {
	key := make([]byte, 32)
	buf := make([]byte, 320)
	par2 := make([][]byte, 8)
	for i := range par2 {
		par2[i] = make([]byte, len(buf))
		copy(par2[i], buf)
	}
	h := NewHmac(New, key)
	b.SetBytes(int64(len(buf) * 8))
	for i := 0; i < b.N; i++ {
		h.Write(par2)
		h.Reset()
		mac := h.Sum(nil)
		par2[0][0] = mac[0][0]
	}
}
