Remove old EC based X25519 code.

Reviewed-by: Rich Salz <rsalz@openssl.org>

4 files changed, 1 insertions, 344 deletions

diff --git a/crypto/ec/build.info b/crypto/ec/build.info
index 061e094162..970c2922cc 100644
--- a/crypto/ec/build.info
+++ b/crypto/ec/build.info
@@ -5,8 +5,7 @@ SOURCE[../../libcrypto]=\
         ec2_smpl.c ec2_mult.c ec_ameth.c ec_pmeth.c eck_prn.c \
         ecp_nistp224.c ecp_nistp256.c ecp_nistp521.c ecp_nistputil.c \
         ecp_oct.c ec2_oct.c ec_oct.c ec_kmeth.c ecdh_ossl.c ecdh_kdf.c \
-        ecdsa_ossl.c ecdsa_sign.c ecdsa_vrf.c ec_25519.c curve25519.c \
-        ecx_meth.c \
+        ecdsa_ossl.c ecdsa_sign.c ecdsa_vrf.c curve25519.c ecx_meth.c \
         {- $target{ec_asm_src} -}
 
 GENERATE[ecp_nistz256-x86.s]=asm/ecp_nistz256-x86.pl $(PERLASM_SCHEME) $(CFLAGS) $(LIB_CFLAGS) $(PROCESSOR)
diff --git a/crypto/ec/ec_25519.c b/crypto/ec/ec_25519.c
deleted file mode 100644
index df0ad8a0c0..0000000000
--- a/crypto/ec/ec_25519.c
+++ /dev/null
@@ -1,328 +0,0 @@
-/*
- * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License").  You may not use
- * this file except in compliance with the License.  You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
-
-#include <string.h>
-#include <openssl/err.h>
-#include <openssl/rand.h>
-#include "ec_lcl.h"
-
-/* Length of Curve 25519 keys */
-#define EC_X25519_KEYLEN    32
-/* Group degree and order bits */
-#define EC_X25519_BITS      253
-
-/* Copy Curve25519 public key buffer, allocating is necessary */
-static int x25519_init_public(EC_POINT *pub, const void *src)
-{
-    if (pub->custom_data == NULL) {
-        pub->custom_data = OPENSSL_malloc(EC_X25519_KEYLEN);
-        if (pub->custom_data == NULL)
-            return 0;
-    }
-    if (src != NULL)
-        memcpy(pub->custom_data, src, EC_X25519_KEYLEN);
-    return 1;
-}
-
-/* Copy Curve25519 private key buffer, allocating is necessary */
-static int x25519_init_private(EC_KEY *dst, const void *src)
-{
-    if (dst->custom_data == NULL) {
-        dst->custom_data = OPENSSL_secure_malloc(EC_X25519_KEYLEN);
-        if (dst->custom_data == NULL)
-            return 0;
-    }
-    if (src != NULL)
-        memcpy(dst->custom_data, src, EC_X25519_KEYLEN);
-    return 1;
-}
-
-static int x25519_group_init(EC_GROUP *grp)
-{
-    return 1;
-}
-
-static int x25519_group_copy(EC_GROUP *dst, const EC_GROUP *src)
-{
-    return 1;
-}
-
-static int x25519_group_get_degree(const EC_GROUP *src)
-{
-    return EC_X25519_BITS;
-}
-
-static int x25519_group_order_bits(const EC_GROUP *src)
-{
-    return EC_X25519_BITS;
-}
-
-static int x25519_set_private(EC_KEY *eckey, const BIGNUM *priv_key)
-{
-    if (BN_num_bytes(priv_key) > EC_X25519_KEYLEN)
-        return 0;
-    if (x25519_init_private(eckey, NULL))
-        return 0;
-    /* Convert BIGNUM form private key to internal format */
-    if (BN_bn2lebinpad(priv_key, eckey->custom_data, EC_X25519_KEYLEN)
-        != EC_X25519_KEYLEN)
-        return 0;
-    return 1;
-}
-
-static int x25519_keycheck(const EC_KEY *eckey)
-{
-    const char *pubkey;
-    if (eckey->pub_key == NULL)
-        return 0;
-    pubkey = eckey->pub_key->custom_data;
-    if (pubkey == NULL)
-        return 0;
-    if (eckey->custom_data != NULL) {
-        uint8_t tmp[EC_X25519_KEYLEN];
-        /* Check eckey->priv_key exists and matches eckey->custom_data */
-        if (eckey->priv_key == NULL)
-            return 0;
-        if (BN_bn2lebinpad(eckey->priv_key, tmp, EC_X25519_KEYLEN)
-            != EC_X25519_KEYLEN
-            || CRYPTO_memcmp(tmp, eckey->custom_data,
-                             EC_X25519_KEYLEN) != 0) {
-            OPENSSL_cleanse(tmp, EC_X25519_KEYLEN);
-            return 0;
-        }
-        X25519_public_from_private(tmp, eckey->custom_data);
-        if (CRYPTO_memcmp(pubkey, tmp, EC_X25519_KEYLEN) == 0)
-            return 1;
-        return 0;
-    } else {
-        return 1;
-    }
-}
-
-static int x25519_keygenpub(EC_KEY *eckey)
-{
-    X25519_public_from_private(eckey->pub_key->custom_data,
-                               eckey->custom_data);
-    return 1;
-}
-
-static int x25519_keygen(EC_KEY *eckey)
-{
-    unsigned char *key;
-    if (x25519_init_private(eckey, NULL) == 0)
-        return 0;
-    key = eckey->custom_data;
-    if (RAND_bytes(key, EC_X25519_KEYLEN) <= 0)
-        return 0;
-    key[0] &= 248;
-    key[31] &= 127;
-    key[31] |= 64;
-    /*
-     * Although the private key is kept as an array in eckey->custom_data
-     * Set eckey->priv_key too so existing code which uses
-     * EC_KEY_get0_private_key() still works.
-     */
-    if (eckey->priv_key == NULL)
-        eckey->priv_key = BN_secure_new();
-    if (eckey->priv_key == NULL)
-        return 0;
-    if (BN_lebin2bn(eckey->custom_data, EC_X25519_KEYLEN, eckey->priv_key) ==
-        NULL)
-        return 0;
-    if (eckey->pub_key == NULL)
-        eckey->pub_key = EC_POINT_new(eckey->group);
-    if (eckey->pub_key == NULL)
-        return 0;
-    return x25519_keygenpub(eckey);
-}
-
-static void x25519_keyfinish(EC_KEY *eckey)
-{
-    OPENSSL_secure_free(eckey->custom_data);
-    eckey->custom_data = NULL;
-}
-
-static int x25519_keycopy(EC_KEY *dest, const EC_KEY *src)
-{
-    if (src->custom_data == NULL)
-        return 0;
-    return x25519_init_private(dest, src->custom_data);
-}
-
-static int x25519_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len)
-{
-    if (len != EC_X25519_KEYLEN)
-        return 0;
-    if (x25519_init_private(eckey, buf) == 0)
-        return 0;
-    /*
-     * Although the private key is kept as an array in eckey->custom_data
-     * Set eckey->priv_key too so existing code which uses
-     * EC_KEY_get0_private_key() still works.
-     */
-    if (eckey->priv_key == NULL)
-        eckey->priv_key = BN_secure_new();
-    if (eckey->priv_key == NULL)
-        return 0;
-    if (BN_lebin2bn(buf, EC_X25519_KEYLEN, eckey->priv_key) == NULL)
-        return 0;
-    return 1;
-}
-
-static size_t x25519_priv2oct(const EC_KEY *eckey,
-                              unsigned char *buf, size_t len)
-{
-    size_t keylen = EC_X25519_KEYLEN;
-    if (eckey->custom_data == NULL)
-        return 0;
-    if (buf != NULL) {
-        if (len < keylen)
-            return 0;
-        memcpy(buf, eckey->custom_data, keylen);
-    }
-    return keylen;
-}
-
-static int x25519_point_init(EC_POINT *pt)
-{
-    return x25519_init_public(pt, NULL);
-}
-
-static void x25519_point_finish(EC_POINT *pt)
-{
-    OPENSSL_free(pt->custom_data);
-    pt->custom_data = NULL;
-}
-
-static void x25519_point_clear_finish(EC_POINT *pt)
-{
-    OPENSSL_clear_free(pt->custom_data, EC_X25519_KEYLEN);
-    pt->custom_data = NULL;
-}
-
-static int x25519_point_copy(EC_POINT *dst, const EC_POINT *src)
-{
-    memcpy(dst->custom_data, src->custom_data, EC_X25519_KEYLEN);
-    return 1;
-}
-
-static size_t x25519_point2oct(const EC_GROUP *grp, const EC_POINT *pt,
-                               point_conversion_form_t form,
-                               unsigned char *buf, size_t len, BN_CTX *ctx)
-{
-    if (buf != NULL) {
-        if (len < EC_X25519_KEYLEN)
-            return 0;
-        memcpy(buf, pt->custom_data, EC_X25519_KEYLEN);
-    }
-    return EC_X25519_KEYLEN;
-}
-
-static int x25519_oct2point(const EC_GROUP *grp, EC_POINT *pt,
-                            const unsigned char *buf, size_t len, BN_CTX *ctx)
-{
-    unsigned char *pubkey = pt->custom_data;
-    if (len != EC_X25519_KEYLEN)
-        return 0;
-    memcpy(pubkey, buf, EC_X25519_KEYLEN);
-    /* Mask off MSB */
-    pubkey[EC_X25519_KEYLEN - 1] &= 0x7F;
-    return 1;
-}
-
-static int x25519_point_cmp(const EC_GROUP *group, const EC_POINT *a,
-                            const EC_POINT *b, BN_CTX *ctx)
-{
-    /* Shouldn't happen as initialised to non-zero */
-    if (a->custom_data == NULL || b->custom_data == NULL)
-        return -1;
-
-    if (CRYPTO_memcmp(a->custom_data, b->custom_data, EC_X25519_KEYLEN) == 0)
-        return 0;
-
-    return 1;
-}
-
-static int x25519_compute_key(unsigned char **psec, size_t *pseclen,
-                              const EC_POINT *pub_key, const EC_KEY *ecdh)
-{
-    unsigned char *key;
-    int ret = 0;
-    if (ecdh->custom_data == NULL)
-        return 0;
-    key = OPENSSL_malloc(EC_X25519_KEYLEN);
-    if (key == NULL)
-        return 0;
-    if (X25519(key, ecdh->custom_data, pub_key->custom_data) == 0)
-        goto err;
-    *psec = key;
-    *pseclen = EC_X25519_KEYLEN;
-    return 1;
-
- err:
-    OPENSSL_clear_free(key, EC_X25519_KEYLEN);
-    return ret;
-}
-
-const EC_METHOD *ec_x25519_meth(void)
-{
-    static const EC_METHOD ret = {
-        EC_FLAGS_CUSTOM_CURVE | EC_FLAGS_NO_SIGN,
-        NID_undef,
-        x25519_group_init,      /* group_init */
-        0,                      /* group_finish */
-        0,                      /* group_clear_finish */
-        x25519_group_copy,      /* group_copy */
-        0,                      /* group_set_curve */
-        0,                      /* group_get_curve */
-        x25519_group_get_degree,
-        x25519_group_order_bits,
-        0,                      /* group_check_discriminant */
-        x25519_point_init,
-        x25519_point_finish,
-        x25519_point_clear_finish,
-        x25519_point_copy,
-        0,                      /* point_set_to_infinity */
-        0,                      /* set_Jprojective_coordinates_GFp */
-        0,                      /* get_Jprojective_coordinates_GFp */
-        0,                      /* point_set_affine_coordinates */
-        0,                      /* point_get_affine_coordinates */
-        0,                      /* point_set_compressed_coordinates */
-        x25519_point2oct,
-        x25519_oct2point,
-        0,                      /* simple_add */
-        0,                      /* simple_dbl */
-        0,                      /* simple_invert */
-        0,                      /* simple_is_at_infinity */
-        0,                      /* simple_is_on_curve */
-        x25519_point_cmp,
-        0,                      /* simple_make_affine */
-        0,                      /* simple_points_make_affine */
-        0,                      /* points_mul */
-        0,                      /* precompute_mult */
-        0,                      /* have_precompute_mult */
-        0,                      /* field_mul */
-        0,                      /* field_sqr */
-        0,                      /* field_div */
-        0,                      /* field_encode */
-        0,                      /* field_decode */
-        0,                      /* field_set_to_one */
-        x25519_priv2oct,
-        x25519_oct2priv,
-        x25519_set_private,
-        x25519_keygen,
-        x25519_keycheck,
-        x25519_keygenpub,
-        x25519_keycopy,
-        x25519_keyfinish,
-        x25519_compute_key
-    };
-
-    return &ret;
-}
diff --git a/crypto/ec/ec_curve.c b/crypto/ec/ec_curve.c
index 6e125f4bda..f8a3846fd5 100644
--- a/crypto/ec/ec_curve.c
+++ b/crypto/ec/ec_curve.c
@@ -2973,7 +2973,6 @@ static const ec_list_element curve_list[] = {
      "RFC 5639 curve over a 512 bit prime field"},
     {NID_brainpoolP512t1, &_EC_brainpoolP512t1.h, 0,
      "RFC 5639 curve over a 512 bit prime field"},
-    {NID_X25519, NULL, ec_x25519_meth, "X25519"},
 };
 
 #define curve_list_length OSSL_NELEM(curve_list)
diff --git a/crypto/ec/ec_lcl.h b/crypto/ec/ec_lcl.h
index 5b79340a14..c67efef317 100644
--- a/crypto/ec/ec_lcl.h
+++ b/crypto/ec/ec_lcl.h
@@ -254,12 +254,6 @@ struct ec_key_st {
     EC_GROUP *group;
     EC_POINT *pub_key;
     BIGNUM *priv_key;
-    /*
-     * Arbitrary extra data.
-     * For example in X25519 this contains the raw private key in a 32 byte
-     * buffer.
-     */
-    void *custom_data;
     unsigned int enc_flag;
     point_conversion_form_t conv_form;
     int references;
@@ -280,11 +274,6 @@ struct ec_point_st {
                                  * Z) represents (X/Z^2, Y/Z^3) if Z != 0 */
     int Z_is_one;               /* enable optimized point arithmetics for
                                  * special case */
-    /*
-     * Arbitrary extra data.
-     * For example in X25519 this contains the public key in a 32 byte buffer.
-     */
-    void *custom_data;
 } /* EC_POINT */ ;
 
 NISTP224_PRE_COMP *EC_nistp224_pre_comp_dup(NISTP224_PRE_COMP *);
@@ -613,8 +602,6 @@ int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
 int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
                           const ECDSA_SIG *sig, EC_KEY *eckey);
 
-const EC_METHOD *ec_x25519_meth(void);
-
 int X25519(uint8_t out_shared_key[32], const uint8_t private_key[32],
            const uint8_t peer_public_value[32]);
 void X25519_public_from_private(uint8_t out_public_value[32],