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30 lines
688 B
Go
30 lines
688 B
Go
package sign
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import (
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"bytes"
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"encoding/binary"
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"math/rand"
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)
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// A randomReader wraps a math/rand.Rand within an reader so that it can used
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// as a predictable testing replacement for crypto/rand.Reader
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type randomReader struct {
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b *bytes.Buffer
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r *rand.Rand
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}
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// newRandomReader returns a new instance of the random reader
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func newRandomReader(r *rand.Rand) *randomReader {
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return &randomReader{b: &bytes.Buffer{}, r: r}
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}
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// Read will read random bytes from up to the length of b.
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func (m *randomReader) Read(b []byte) (int, error) {
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for i := 0; i < len(b); {
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binary.Write(m.b, binary.LittleEndian, m.r.Int63())
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n, _ := m.b.Read(b[i:])
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i += n
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}
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return len(b), nil
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}
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