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Sha256 Algorithm Explained
source link: https://sha256algorithm.com/
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Message block - 512 Bits
10000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
00000000 00000000 00000000 00000000►
1. Encode the input to binary using UTF-8 and append a single '1' to it.
2. Prepend that binary to the message block.
3. Append the original message length (0, 0 in decimal) at the end of the message block as a 64-bit big-endian integer.
4. Add 447 zeros between the encoded message and the length integer so that the message block is a multiple of 512. In this case 0 + 1 + 447 + 64 = 512
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