Golang C.EVP_PKEY_get1_RSA类(方法)实例源码

func (key *pKey) RSASize() (int, error) {
	rsa := (*C.RSA)(C.EVP_PKEY_get1_RSA(key.key))
	if rsa == nil {
		return 0, errors.New("failed getting rsa key")
	}
	defer C.RSA_free(rsa)

	return int(C.RSA_size(rsa)), nil
}

func (key *pKey) PrivateSign(dst []byte, src []byte, padding int) (int, error) {
	rsa := (*C.RSA)(C.EVP_PKEY_get1_RSA(key.key))
	if rsa == nil {
		return 0, errors.New("failed getting rsa key")
	}
	defer C.RSA_free(rsa)

	outlen := C.RSA_private_encrypt(C.int(len(src)), (*C.uchar)(unsafe.Pointer(&src[0])), (*C.uchar)(unsafe.Pointer(&dst[0])), rsa, C.int(padding))
	if outlen > 0 {
		return int(outlen), nil
	} else {
		return int(outlen), errors.New("unable to decrypt")
	}
}

func (key *pKey) MarshalPKIXPublicKeyDER() (der_block []byte,
	err error) {
	bio := C.BIO_new(C.BIO_s_mem())
	if bio == nil {
		return nil, errors.New("failed to allocate memory BIO")
	}
	defer C.BIO_free(bio)
	rsa := (*C.RSA)(C.EVP_PKEY_get1_RSA(key.key))
	if rsa == nil {
		return nil, errors.New("failed getting rsa key")
	}
	defer C.RSA_free(rsa)
	if int(C.i2d_RSA_PUBKEY_bio(bio, rsa)) != 1 {
		return nil, errors.New("failed dumping public key der")
	}
	return ioutil.ReadAll(asAnyBio(bio))
}

func (key *pKey) MarshalPKCS1PrivateKeyPEM() (pem_block []byte,
	err error) {
	bio := C.BIO_new(C.BIO_s_mem())
	if bio == nil {
		return nil, errors.New("failed to allocate memory BIO")
	}
	defer C.BIO_free(bio)
	rsa := (*C.RSA)(C.EVP_PKEY_get1_RSA(key.key))
	if rsa == nil {
		return nil, errors.New("failed getting rsa key")
	}
	defer C.RSA_free(rsa)
	if int(C.PEM_write_bio_RSAPrivateKey(bio, rsa, nil, nil, C.int(0), nil,
		nil)) != 1 {
		return nil, errors.New("failed dumping private key")
	}
	return ioutil.ReadAll(asAnyBio(bio))
}