45 lines
1014 B
Go
45 lines
1014 B
Go
package digest
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import (
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"hash"
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"io"
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)
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// Verifier presents a general verification interface to be used with message
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// digests and other byte stream verifications. Users instantiate a Verifier
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// from one of the various methods, write the data under test to it then check
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// the result with the Verified method.
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type Verifier interface {
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io.Writer
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// Verified will return true if the content written to Verifier matches
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// the digest.
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Verified() bool
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}
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// NewDigestVerifier returns a verifier that compares the written bytes
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// against a passed in digest.
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func NewDigestVerifier(d Digest) (Verifier, error) {
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if err := d.Validate(); err != nil {
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return nil, err
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}
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return hashVerifier{
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hash: d.Algorithm().Hash(),
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digest: d,
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}, nil
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}
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type hashVerifier struct {
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digest Digest
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hash hash.Hash
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}
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func (hv hashVerifier) Write(p []byte) (n int, err error) {
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return hv.hash.Write(p)
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}
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func (hv hashVerifier) Verified() bool {
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return hv.digest == NewDigest(hv.digest.Algorithm(), hv.hash)
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}
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