33 lines
661 B
Go
33 lines
661 B
Go
package secp
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import (
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"fmt"
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)
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// ECDH computes an EC Diffie-Hellman shared secret
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func (c *Context) ECDH(pubkey []byte, seckey []byte) (output []byte, err error) {
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if ecdh == nil {
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err = fmt.Errorf("ecdh module not available")
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return
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}
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if len(pubkey) != PublicKeySize {
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err = fmt.Errorf("public key must be %d bytes", PublicKeySize)
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return
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}
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if len(seckey) != PrivateKeySize {
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err = fmt.Errorf("private key must be %d bytes", PrivateKeySize)
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return
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}
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output = make([]byte, SharedSecretSize)
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ret := ecdh(c.ctx, &output[0], &pubkey[0], &seckey[0], 0, 0)
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if ret != 1 {
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err = fmt.Errorf("failed to compute ECDH")
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return
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}
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return
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}
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