SHA256 (SHA in general) has a precise behavior if you wanna hash a number of bits not multiple of the block (512bit) Sha256.go handle this correcty ONLY in the case that you input is at least multiple of 8 bits. If you wanna hash, say, 20bit (0xABCDE) you cannot obtain a correct result. Note that Sha256(0xABCDE) is (See FIPS and NIST publications) not the same of Sha256 of 0x0ABCDE o 0xABCDE0. Any idea or any implementation available on the web? A .Write(data []byte, effectciveLenInBits int) would be required, while today Write([]byte) assumes that each bit of the last byte is meaningful and to be hashed
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