gcp

Documentation

Overview

Package gcp implement the interface with google cloud kms service

Package gcp contains utilities related to Google Cloud Platform KMS.

Index

• Constants
• func ValidReference(ref string) error
• type SignerVerifier
  • func LoadSignerVerifier(defaultCtx context.Context, referenceStr string, opts ...option.ClientOption) (*SignerVerifier, error)
  • func (g *SignerVerifier) CreateKey(ctx context.Context, algorithm string) (crypto.PublicKey, error)
  • func (g *SignerVerifier) CryptoSigner(ctx context.Context, errFunc func(error)) (myhash.Signer, myhash.SignerOpts, error)
  • func (g *SignerVerifier) DefaultAlgorithm() string
  • func (g *SignerVerifier) PublicKey(opts ...signature.PublicKeyOption) (crypto.PublicKey, error)
  • func (g *SignerVerifier) SignMessage(message io.Reader, opts ...signature.SignOption) ([]byte, error)
  • func (g *SignerVerifier) SupportedAlgorithms() (result []string)
  • func (g *SignerVerifier) VerifySignature(signature, message io.Reader, opts ...signature.VerifyOption) error

Constants

const (
	AlgorithmECDSAP256SHA256       = "ecdsa-p256-sha256"
	AlgorithmECDSAP384SHA384       = "ecdsa-p384-sha384"
	AlgorithmRSAPKCS1v152048SHA256 = "rsa-pkcs1v15-2048-sha256"
	AlgorithmRSAPKCS1v153072SHA256 = "rsa-pkcs1v15-3072-sha256"
	AlgorithmRSAPKCS1v154096SHA256 = "rsa-pkcs1v15-4096-sha256"
	AlgorithmRSAPKCS1v154096SHA512 = "rsa-pkcs1v15-4096-sha512"
	AlgorithmRSAPSS2048SHA256      = "rsa-pss-2048-sha256"
	AlgorithmRSAPSS3072SHA256      = "rsa-pss-3072-sha256"
	AlgorithmRSAPSS4096SHA256      = "rsa-pss-4096-sha256"
	AlgorithmRSAPSS4096SHA512      = "rsa-pss-4096-sha512"
)

const ReferenceScheme = "gcpkms://"

ReferenceScheme schemes for various KMS services are copied from https://github.com/google/go-cloud/tree/master/secrets

Functions

func ValidReference

func ValidReference(ref string) error

ValidReference returns a non-nil error if the reference string is invalid

Types

type SignerVerifier

type SignerVerifier struct {
	// contains filtered or unexported fields
}

SignerVerifier creates and verifies digital signatures over a message using GCP KMS service

func LoadSignerVerifier

func LoadSignerVerifier(defaultCtx context.Context, referenceStr string, opts ...option.ClientOption) (*SignerVerifier, error)

LoadSignerVerifier generates signatures using the specified key object in GCP KMS and hash algorithm.

It also can verify signatures locally using the public key. hashFunc must not be crypto.Hash(0).

func (*SignerVerifier) CreateKey

func (g *SignerVerifier) CreateKey(ctx context.Context, algorithm string) (crypto.PublicKey, error)

CreateKey attempts to create a new key in Vault with the specified algorithm.

func (*SignerVerifier) CryptoSigner

func (g *SignerVerifier) CryptoSigner(ctx context.Context, errFunc func(error)) (myhash.Signer, myhash.SignerOpts, error)

CryptoSigner returns a crypto.Signer object that uses the underlying SignerVerifier, along with a crypto.SignerOpts object that allows the KMS to be used in APIs that only accept the standard golang objects

func (*SignerVerifier) DefaultAlgorithm

func (g *SignerVerifier) DefaultAlgorithm() string

DefaultAlgorithm returns the default algorithm for the GCP KMS service

func (*SignerVerifier) PublicKey

func (g *SignerVerifier) PublicKey(opts ...signature.PublicKeyOption) (crypto.PublicKey, error)

PublicKey returns the public key that can be used to verify signatures created by this signer. If the caller wishes to specify the context to use to obtain the public key, pass option.WithContext(desiredCtx).

All other options are ignored if specified.

func (*SignerVerifier) SignMessage

func (g *SignerVerifier) SignMessage(message io.Reader, opts ...signature.SignOption) ([]byte, error)

SignMessage signs the provided message using GCP KMS. If the message is provided, this method will compute the digest according to the hash function specified when the Signer was created.

SignMessage recognizes the following Options listed in order of preference:

- WithContext()

- WithDigest()

- WithCryptoSignerOpts()

All other options are ignored if specified.

func (*SignerVerifier) SupportedAlgorithms

func (g *SignerVerifier) SupportedAlgorithms() (result []string)

SupportedAlgorithms returns the list of algorithms supported by the GCP KMS service

func (*SignerVerifier) VerifySignature

func (g *SignerVerifier) VerifySignature(signature, message io.Reader, opts ...signature.VerifyOption) error

VerifySignature verifies the signature for the given message. Unless provided in an option, the digest of the message will be computed using the hash function specified when the SignerVerifier was created.

This function returns nil if the verification succeeded, and an error message otherwise.

This function recognizes the following Options listed in order of preference:

- WithDigest()

All other options are ignored if specified.