--- /dev/null
+/* 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 draft-ietf-curdle-pkix-04, 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 draft-ietf-curdle-pkix-04, 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 draft-ietf-curdle-pkix-04, 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 draft-ietf-curdle-pkix-04, 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;
+}
git://repos.xcallymotion.com / motion2.git / blobdiff