crypto

Overview ¶

Package crypto provides cryptographic operations for signing and verification.

This package provides:

• ECDSA P-256 signing and verification
• DER encoding/decoding of ECDSA signatures
• Public key extraction from signatures
• SHA256 hashing

Signing ¶

Sign data using ECDSA P-256:

signature, err := crypto.SignWithECDSA(privateKey, data)
if err != nil {
	log.Fatal(err)
}

Verification ¶

Verify ECDSA signatures:

valid := crypto.VerifyECDSASignature(publicKey, data, signature)

Serialization ¶

Marshal ECDSA signatures to DER format:

derSig, err := crypto.MarshalECDSASignatureDER(r, s)
if err != nil {
	log.Fatal(err)
}