55d18b7db9
After my last change, I noticed that the hash is used as a []byte in most
cases (other than tests). This patch updates the type to use a []byte, which
(although unlikely very important) also improves performance:
Compared to the previous version:
benchstat new.txt new2.txt
name old time/op new time/op delta
HashData-10 128ns ± 1% 116ns ± 1% -9.77% (p=0.000 n=20+20)
name old alloc/op new alloc/op delta
HashData-10 208B ± 0% 88B ± 0% -57.69% (p=0.000 n=20+20)
name old allocs/op new allocs/op delta
HashData-10 3.00 ± 0% 2.00 ± 0% -33.33% (p=0.000 n=20+20)
And compared to the original version:
benchstat old.txt new2.txt
name old time/op new time/op delta
HashData-10 201ns ± 1% 116ns ± 1% -42.39% (p=0.000 n=18+20)
name old alloc/op new alloc/op delta
HashData-10 416B ± 0% 88B ± 0% -78.85% (p=0.000 n=20+20)
name old allocs/op new allocs/op delta
HashData-10 6.00 ± 0% 2.00 ± 0% -66.67% (p=0.000 n=20+20)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
14 lines
274 B
Go
14 lines
274 B
Go
package resolvconf
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import (
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"crypto/sha256"
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"encoding/hex"
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)
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// hashData returns the sha256 sum of data.
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func hashData(data []byte) []byte {
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f := sha256.Sum256(data)
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out := make([]byte, 2*sha256.Size)
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hex.Encode(out, f[:])
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return append([]byte("sha256:"), out...)
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}
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