[이동] SHA-512 구현해보기

36227 단어 go

소개



Go에서 인증을 시도하고 싶습니다.

이전에 ASP.NET Core Identity에서 시도했기 때문에 해당 소스 코드를 읽었습니다.


  • 암호 해싱에 대해 먼저 알아야겠다고 생각했습니다.
    "PasswordHasher.cs"에 따르면 기본적으로 HMAC-SHA512를 사용합니다.
  • Hash passwords in ASP.NET Core - Microsoft Docs
  • aspnetcore/PasswordHasher.cs - dotnet/aspnetcore - GitHub

  • 그래서 이번에는 SHA-512에 대해 알아보기로 했습니다.

    Go에는 sha512 package이 있지만 직접 구현해 보겠습니다.


    main.go



    package main
    
    import (
        "crypto/sha512"
        "log"
    )
    
    func main() {
        result := Hash("hello")
        result2 := sha512.Sum512([]byte("hello"))
    
        log.Println(result)
        log.Printf("%x", result2)
    }
    

    sha512Hasher.go



    package main
    
    import (
        "fmt"
    )
    
    const (
        messageBlockSize = 128
    )
    /* eighty constant 64-bit words, K0, K1, ... K79 */
    var K = []uint64{
        0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc,
        0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118,
        0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
        0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694,
        0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
        0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
        0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4,
        0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70,
        0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
        0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b,
        0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30,
        0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8,
        0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8,
        0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3,
        0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec,
        0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b,
        0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178,
        0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b,
        0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c,
        0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817,
    }
    
    func Hash(original string) string {
        inputValues := []byte(original)
        formattedMessage := formatInput(inputValues)
        computed := compute(formattedMessage)
        return computed
    }
    
    func formatInput(values []byte) []byte {
        // Calculate as binary 8-digit numbers
        L := len(values) * 8
        mod := len(values) % messageBlockSize
        padcount := messageBlockSize - mod
        /* 896 < L < 1024 */
        if mod > messageBlockSize-8 {
            padcount += messageBlockSize
        }
        results := make([]byte, len(values)+padcount)
        copy(results, values)
        // add 10000000
        results[len(values)] = 128
        // set L into the end of the message
        for i := 1; i <= 8; i++ {
            results[len(results)-i] = byte(L)
            L = L >> 8
        }
        return results
    }
    /*
    * For t = 0 to 15
    *     Wt = M(i)t
    */
    func initFirst16Words(words []byte) []uint64 {
        W := make([]uint64, 16)
        for t := 0; t < 16; t++ {
            t8 := t * 8
            W[t] = uint64(words[t8])<<56 |
                uint64(words[t8+1])<<48 |
                uint64(words[t8+2])<<40 |
                uint64(words[t8+3])<<32 |
                uint64(words[t8+4])<<24 |
                uint64(words[t8+5])<<16 |
                uint64(words[t8+6])<<8 |
                uint64(words[t8+7])
        }
        return W
    }
    
    func generateMessageBlock(words []byte) [][]byte {
        var M [][]byte
        for i := 0; i < len(words); i += messageBlockSize {
            M = append(M, words[i:i+messageBlockSize])
        }
        return M
    }
    
    /* SHR^n(x) = x>>n */
    func SHR(bits, word uint64) uint64 {
        return word >> bits
    }
    
    /* ROTR^n(x) = (x>>n) OR (x<<(w-n)) */
    func ROTR(bits, word uint64) uint64 {
        return (word >> bits) | (word << (64 - bits))
    }
    
    /* CH( x, y, z) = (x AND y) XOR ( (NOT x) AND z) */
    func CH(x, y, z uint64) uint64 {
        return (x & y) ^ ((^x) & z)
    }
    
    /* MAJ( x, y, z) = (x AND y) XOR (x AND z) XOR (y AND z) */
    func MAJ(x, y, z uint64) uint64 {
        return (x & y) ^ (x & z) ^ (y & z)
    }
    
    /* BSIG0(x) = ROTR^28(x) XOR ROTR^34(x) XOR ROTR^39(x) */
    func BSIG0(x uint64) uint64 {
        return ROTR(28, x) ^ ROTR(34, x) ^ ROTR(39, x)
    }
    
    /* BSIG1(x) = ROTR^14(x) XOR ROTR^18(x) XOR ROTR^41(x) */
    func BSIG1(x uint64) uint64 {
        return ROTR(14, x) ^ ROTR(18, x) ^ ROTR(41, x)
    }
    
    /* SSIG0(x) = ROTR^1(x) XOR ROTR^8(x) XOR SHR^7(x) */
    func SSIG0(x uint64) uint64 {
        return ROTR(1, x) ^ ROTR(8, x) ^ SHR(7, x)
    }
    
    /* SSIG1(x) = ROTR^19(x) XOR ROTR^61(x) XOR SHR^6(x) */
    func SSIG1(x uint64) uint64 {
        return ROTR(19, x) ^ ROTR(61, x) ^ SHR(6, x)
    }
    func compute(messages []byte) string {
        /* initial H(0) hash values */
        H := [8]uint64{
            0x6a09e667f3bcc908,
            0xbb67ae8584caa73b,
            0x3c6ef372fe94f82b,
            0xa54ff53a5f1d36f1,
            0x510e527fade682d1,
            0x9b05688c2b3e6c1f,
            0x1f83d9abfb41bd6b,
            0x5be0cd19137e2179,
        }
    
        for _, block := range generateMessageBlock(messages) {
            // init W[0]~W[15]
            words := initFirst16Words(block)
            for t := 16; t <= 79; t++ {
                words = append(words, SSIG1(words[t-2])+words[t-7]+SSIG0(words[t-15])+words[t-16])
            }
            a := H[0]
            b := H[1]
            c := H[2]
            d := H[3]
            e := H[4]
            f := H[5]
            g := H[6]
            h := H[7]
    
            for t, w := range words {
                T1 := h + BSIG1(e) + CH(e, f, g) + K[t] + w
                T2 := BSIG0(a) + MAJ(a, b, c)
                h = g
                g = f
                f = e
                e = d + T1
                d = c
                c = b
                b = a
                a = T1 + T2
            }
    
            H[0] = a + H[0]
            H[1] = b + H[1]
            H[2] = c + H[2]
            H[3] = d + H[3]
            H[4] = e + H[4]
            H[5] = f + H[5]
            H[6] = g + H[6]
            H[7] = h + H[7]
        }
        // get H[N]
        result := ""
        for _, h := range H {
            // Fill with 0s and align to 16 digits
            result += fmt.Sprintf("%016x", h)
        }
        return result
    }
    

    0 패딩



    최종 결과를 얻기 위해 아래와 같이 작성했습니다.

    ...
        // get H[N]
        result := ""
        for _, h := range H {
            result += fmt.Sprintf("%x", h)
        }
        return result
    }
    


    그러나 그것은 crypto/sha512의 결과와 같지 않았습니다.

    // the result of my code
    9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2dff72519673ca72323c3d99ba5c11d7c7acc6e14b8c5dac4663475c2e5c3adef46f73bcdec043
    
    // the result of crypto/sha512
    9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2dff72519673ca72323c3d99ba5c11d7c7acc6e14b8c5da0c4663475c2e5c3adef46f73bcdec043
    


    H[N] 중 하나가 "0"에서 시작하여 생략되었기 때문입니다.

    9b71d224bd62f378
    5d96d46ad3ea3d73
    319bfbc2890caada
    e2dff72519673ca7
    2323c3d99ba5c11d
    7c7acc6e14b8c5da
    c4663475c2e5c3a
    def46f73bcdec043
    


    그래서 아래와 같이 0으로 채웁니다.

    ...
        // get H[N]
        result := ""
        for _, h := range H {
            log.Printf("%x", h)
            // Fill with 0s and align to 16 digits
            result += fmt.Sprintf("%016x", h)
        }
        return result
    }
    


    자원


  • RFC6234 - US Secure Hash Algorithms(SHA and SHA-based HMAC and HKDF)
  • FIPS140-3 Secure Hash Standard (SHS)
  • sha512 package - crypto/sha512 - Go packages
  • 【Go】暗号化やハッシュ化について考えるついでにSHA256を実装する - タウン情報誌 AIR函館
  • ハッシュ関数 SHA-256 のGoによる実装 - Goプログラミングの森
  • 좋은 웹페이지 즐겨찾기