32 lines
633 B
Go
32 lines
633 B
Go
package spectre
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import (
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"crypto/hmac"
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"crypto/sha256"
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)
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func siteKey(userKey []byte, scoper Scoper, siteName string, counter int, scope Scope) []byte {
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nameBytes := []byte(siteName)
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scopeBytes := []byte(scoper.Scope(scope))
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nameBytesLen := len(nameBytes)
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keySalt := append(scopeBytes,
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byte(nameBytesLen>>24),
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byte(nameBytesLen>>16),
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byte(nameBytesLen>>8),
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byte(nameBytesLen),
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)
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keySalt = append(keySalt, nameBytes...)
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keySalt = append(keySalt,
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byte(counter>>24),
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byte(counter>>16),
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byte(counter>>8),
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byte(counter),
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)
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sign := hmac.New(sha256.New, userKey)
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sign.Write(keySalt)
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return sign.Sum(nil)
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}
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