db64ecb1d9
SHA-256 of (system, user) joined with 0x00 separator, truncated to uint64. Drives deterministic sample-band routing: identical prompt pair → same hash → same local-vs-Claude decision on every call. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
22 lines
632 B
Go
22 lines
632 B
Go
package routing
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import (
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"crypto/sha256"
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"encoding/binary"
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)
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// CanonicalHash returns a deterministic 64-bit hash of (system, user).
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// Used to make sample-band routing decisions reproducible: identical input
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// strings produce the same hash on every call, independent of process state.
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//
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// Inputs are joined with a 0x00 byte separator before hashing — distinguishes
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// (system="ab", user="cd") from (system="abcd", user="").
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func CanonicalHash(system, user string) uint64 {
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h := sha256.New()
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h.Write([]byte(system))
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h.Write([]byte{0})
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h.Write([]byte(user))
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sum := h.Sum(nil)
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return binary.BigEndian.Uint64(sum[:8])
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}
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