// LoadPublicKeyFromDER loads a public key from a DER-encoded block.
func LoadPublicKeyFromDER(der_block []byte) (PublicKey, error) {
if len(der_block) == 0 {
return nil, errors.New("empty der block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&der_block[0]),
C.int(len(der_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
rsakey := C.d2i_RSA_PUBKEY_bio(bio, nil)
if rsakey == nil {
return nil, errors.New("failed reading rsa key")
}
defer C.RSA_free(rsakey)
// convert to PKEY
key := C.EVP_PKEY_new()
if key == nil {
return nil, errors.New("failed converting to evp_pkey")
}
if C.EVP_PKEY_set1_RSA(key, (*C.struct_rsa_st)(rsakey)) != 1 {
C.EVP_PKEY_free(key)
return nil, errors.New("failed converting to evp_pkey")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.EVP_PKEY_free(p.key)
})
return p, nil
}
// LoadPrivateKeyFromPEM loads a private key from a PEM-encoded block.
func LoadPrivateKeyFromPEMWidthPassword(pem_block []byte, password string) (
PrivateKey, error) {
if len(pem_block) == 0 {
return nil, errors.New("empty pem block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&pem_block[0]),
C.int(len(pem_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
cs := C.CString(password)
defer C.free(unsafe.Pointer(cs))
rsakey := C.PEM_read_bio_RSAPrivateKey(bio, nil, nil, unsafe.Pointer(cs))
if rsakey == nil {
return nil, errors.New("failed reading rsa key")
}
defer C.RSA_free(rsakey)
// convert to PKEY
key := C.EVP_PKEY_new()
if key == nil {
return nil, errors.New("failed converting to evp_pkey")
}
if C.EVP_PKEY_set1_RSA(key, (*C.struct_rsa_st)(rsakey)) != 1 {
C.EVP_PKEY_free(key)
return nil, errors.New("failed converting to evp_pkey")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.EVP_PKEY_free(p.key)
})
return p, nil
}
// GenerateRSAKeyWithExponent generates a new RSA private key.
func GenerateRSAKeyWithExponent(bits int, exponent int) (PrivateKey, error) {
rsa := C.RSA_generate_key(C.int(bits), C.ulong(exponent), nil, nil)
if rsa == nil {
return nil, errors.New("failed to generate RSA key")
}
key := C.EVP_PKEY_new()
if key == nil {
return nil, errors.New("failed to allocate EVP_PKEY")
}
if C.EVP_PKEY_assign_charp(key, C.EVP_PKEY_RSA, (*C.char)(unsafe.Pointer(rsa))) != 1 {
C.EVP_PKEY_free(key)
return nil, errors.New("failed to assign RSA key")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.EVP_PKEY_free(p.key)
})
return p, nil
}
// PublicKey returns the public key embedded in the X509 certificate.
func (c *Certificate) PublicKey() (PublicKey, error) {
pkey := C.X509_get_pubkey(c.x)
if pkey == nil {
return nil, errors.New("no public key found")
}
key := &pKey{key: pkey}
runtime.SetFinalizer(key, func(key *pKey) {
C.EVP_PKEY_free(key.key)
})
return key, nil
}
// LoadPrivateKeyFromPEM loads a private key from a PEM-encoded block.
func LoadPrivateKeyFromPEM(pem_block []byte) (PrivateKey, error) {
//
// Check and load the PEM data
//
if len(pem_block) == 0 {
return nil, errors.New("empty pem block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&pem_block[0]),
C.int(len(pem_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
rsakey := C.PEM_read_bio_RSAPrivateKey(bio, nil, nil, nil)
if rsakey == nil {
return nil, errors.New("failed reading rsa key")
}
defer C.RSA_free(rsakey)
//
// Create a private key
//
key := C.EVP_PKEY_new()
if key == nil {
return nil, errors.New("failed converting to evp_pkey")
}
if C.EVP_PKEY_set1_RSA(key, (*C.struct_rsa_st)(rsakey)) != 1 {
C.EVP_PKEY_free(key)
return nil, errors.New("failed converting to evp_pkey")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.EVP_PKEY_free(p.key)
})
return p, nil
}
func (k *PrivateKey) Free() {
if k.key != nil {
C.EVP_PKEY_free(k.key)
k.key = nil
}
}