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/* Copyright (c) 2017, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/evp.h>
#include <openssl/bytestring.h>
#include <openssl/curve25519.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "internal.h"
#include "../internal.h"
static void ed25519_free(EVP_PKEY *pkey) {
OPENSSL_free(pkey->pkey.ptr);
pkey->pkey.ptr = NULL;
}
static int set_pubkey(EVP_PKEY *pkey, const uint8_t pubkey[32]) {
ED25519_KEY *key = OPENSSL_malloc(sizeof(ED25519_KEY));
if (key == NULL) {
OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
return 0;
}
key->has_private = 0;
OPENSSL_memcpy(key->key.pub.value, pubkey, 32);
ed25519_free(pkey);
pkey->pkey.ptr = key;
return 1;
}
static int set_privkey(EVP_PKEY *pkey, const uint8_t privkey[64]) {
ED25519_KEY *key = OPENSSL_malloc(sizeof(ED25519_KEY));
if (key == NULL) {
OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
return 0;
}
key->has_private = 1;
OPENSSL_memcpy(key->key.priv, privkey, 64);
ed25519_free(pkey);
pkey->pkey.ptr = key;
return 1;
}
static int ed25519_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) {
// See RFC 8410, section 4.
// The parameters must be omitted. Public keys have length 32.
if (CBS_len(params) != 0 ||
CBS_len(key) != 32) {
OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
return 0;
}
return set_pubkey(out, CBS_data(key));
}
static int ed25519_pub_encode(CBB *out, const EVP_PKEY *pkey) {
const ED25519_KEY *key = pkey->pkey.ptr;
// See RFC 8410, section 4.
CBB spki, algorithm, oid, key_bitstring;
if (!CBB_add_asn1(out, &spki, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&spki, &algorithm, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, ed25519_asn1_meth.oid, ed25519_asn1_meth.oid_len) ||
!CBB_add_asn1(&spki, &key_bitstring, CBS_ASN1_BITSTRING) ||
!CBB_add_u8(&key_bitstring, 0 /* padding */) ||
!CBB_add_bytes(&key_bitstring, key->key.pub.value, 32) ||
!CBB_flush(out)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
return 0;
}
return 1;
}
static int ed25519_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
const ED25519_KEY *a_key = a->pkey.ptr;
const ED25519_KEY *b_key = b->pkey.ptr;
return OPENSSL_memcmp(a_key->key.pub.value, b_key->key.pub.value, 32) == 0;
}
static int ed25519_priv_decode(EVP_PKEY *out, CBS *params, CBS *key) {
// See RFC 8410, section 7.
// Parameters must be empty. The key is a 32-byte value wrapped in an extra
// OCTET STRING layer.
CBS inner;
if (CBS_len(params) != 0 ||
!CBS_get_asn1(key, &inner, CBS_ASN1_OCTETSTRING) ||
CBS_len(key) != 0 ||
CBS_len(&inner) != 32) {
OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
return 0;
}
// The PKCS#8 encoding stores only the 32-byte seed, so we must recover the
// full representation which we use from it.
uint8_t pubkey[32], privkey[64];
ED25519_keypair_from_seed(pubkey, privkey, CBS_data(&inner));
return set_privkey(out, privkey);
}
static int ed25519_priv_encode(CBB *out, const EVP_PKEY *pkey) {
ED25519_KEY *key = pkey->pkey.ptr;
if (!key->has_private) {
OPENSSL_PUT_ERROR(EVP, EVP_R_NOT_A_PRIVATE_KEY);
return 0;
}
// See RFC 8410, section 7.
CBB pkcs8, algorithm, oid, private_key, inner;
if (!CBB_add_asn1(out, &pkcs8, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&pkcs8, 0 /* version */) ||
!CBB_add_asn1(&pkcs8, &algorithm, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, ed25519_asn1_meth.oid, ed25519_asn1_meth.oid_len) ||
!CBB_add_asn1(&pkcs8, &private_key, CBS_ASN1_OCTETSTRING) ||
!CBB_add_asn1(&private_key, &inner, CBS_ASN1_OCTETSTRING) ||
// The PKCS#8 encoding stores only the 32-byte seed which is the first 32
// bytes of the private key.
!CBB_add_bytes(&inner, key->key.priv, 32) ||
!CBB_flush(out)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
return 0;
}
return 1;
}
static int ed25519_size(const EVP_PKEY *pkey) { return 64; }
static int ed25519_bits(const EVP_PKEY *pkey) { return 256; }
const EVP_PKEY_ASN1_METHOD ed25519_asn1_meth = {
EVP_PKEY_ED25519,
{0x2b, 0x65, 0x70},
3,
ed25519_pub_decode,
ed25519_pub_encode,
ed25519_pub_cmp,
ed25519_priv_decode,
ed25519_priv_encode,
NULL /* pkey_opaque */,
ed25519_size,
ed25519_bits,
NULL /* param_missing */,
NULL /* param_copy */,
NULL /* param_cmp */,
ed25519_free,
};
EVP_PKEY *EVP_PKEY_new_ed25519_public(const uint8_t public_key[32]) {
EVP_PKEY *ret = EVP_PKEY_new();
if (ret == NULL ||
!EVP_PKEY_set_type(ret, EVP_PKEY_ED25519) ||
!set_pubkey(ret, public_key)) {
EVP_PKEY_free(ret);
return NULL;
}
return ret;
}
EVP_PKEY *EVP_PKEY_new_ed25519_private(const uint8_t private_key[64]) {
EVP_PKEY *ret = EVP_PKEY_new();
if (ret == NULL ||
!EVP_PKEY_set_type(ret, EVP_PKEY_ED25519) ||
!set_privkey(ret, private_key)) {
EVP_PKEY_free(ret);
return NULL;
}
return ret;
}
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