34 lines
661 B
Markdown
34 lines
661 B
Markdown
rfc6979
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=======
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A Go implementation of [RFC 6979](https://tools.ietf.org/html/rfc6979)'s
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deterministic DSA/ECDSA signature scheme.
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``` go
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package main
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha512"
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"fmt"
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"github.com/codahale/rfc6979"
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)
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func main() {
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// Generate a key pair.
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// You need a high-quality PRNG for this.
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k, _ := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
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// Hash a message.
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alg := sha512.New()
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alg.Write([]byte("I am a potato."))
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hash := alg.Sum(nil)
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// Sign the message. You don't need a PRNG for this.
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r, s, _ := rfc6979.SignECDSA(k, hash, sha512.New)
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fmt.Printf("Signature: %X%X", r, s)
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}
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```
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