原為轉載至作者的SHA256算法原理詳解：https://blog.csdn.net/u011583927/article/details/80905740

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1.以下是我根據原文理解做的圖：

2. 結合偽代碼更容易理解

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Note: All variables are unsigned 32 bits and wrap modulo 232 when calculatingInitialize variables (first 32 bits of the fractional parts of the square roots of the first 8 primes 2..19): h0 := 0x6a09e667 h1 := 0xbb67ae85 h2 := 0x3c6ef372 h3 := 0xa54ff53a h4 := 0x510e527f h5 := 0x9b05688c h6 := 0x1f83d9ab h7 := 0x5be0cd19Initialize table of round constants (first 32 bits of the fractional parts of the cube roots of the first 64 primes 2..311): k[0..63] :=0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2Pre-processing: append the bit '1' to the message append k bits '0', where k is the minimum number >= 0 such that the resulting messagelength (in bits) is congruent to 448(mod 512) append length of message (before pre-processing), in bits, as 64-bit big-endian integerProcess the message in successive 512-bit chunks: break message into 512-bit chunks for each chunkbreak chunk into sixteen 32-bit big-endian words w[0..15]Extend the sixteen 32-bit words into sixty-four 32-bit words:for i from 16 to 63s0 := (w[i-15] rightrotate 7) xor (w[i-15] rightrotate 18) xor(w[i-15] rightshift 3)s1 := (w[i-2] rightrotate 17) xor (w[i-2] rightrotate 19) xor(w[i-2] rightshift 10)w[i] := w[i-16] + s0 + w[i-7] + s1Initialize hash value for this chunk:a := h0b := h1c := h2d := h3e := h4f := h5g := h6h := h7Main loop:for i from 0 to 63s0 := (a rightrotate 2) xor (a rightrotate 13) xor(a rightrotate 22)maj := (a and b) xor (a and c) xor(b and c)t2 := s0 + majs1 := (e rightrotate 6) xor (e rightrotate 11) xor(e rightrotate 25)ch := (e and f) xor ((not e) and g)t1 := h + s1 + ch + k[i] + w[i]h := gg := ff := ee := d + t1d := cc := bb := aa := t1 + t2Add this chunk's hash to result so far:h0 := h0 + ah1 := h1 + bh2 := h2 + ch3 := h3 + dh4 := h4 + eh5 := h5 + fh6 := h6 + gh7 := h7 + hProduce the final hash value (big-endian): digest = hash = h0 append h1 append h2 append h3 append h4 append h5 append h6 append h7

ps： 可以參照原文? 結合著理解，原文已經夠詳細

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