463 lines
12 KiB
C
463 lines
12 KiB
C
/*
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* Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/ec.h>
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#include "ec_lcl.h"
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#include <openssl/evp.h>
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#include "internal/evp_int.h"
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/* EC pkey context structure */
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typedef struct {
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/* Key and paramgen group */
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EC_GROUP *gen_group;
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/* message digest */
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const EVP_MD *md;
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/* Duplicate key if custom cofactor needed */
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EC_KEY *co_key;
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/* Cofactor mode */
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signed char cofactor_mode;
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/* KDF (if any) to use for ECDH */
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char kdf_type;
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/* Message digest to use for key derivation */
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const EVP_MD *kdf_md;
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/* User key material */
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unsigned char *kdf_ukm;
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size_t kdf_ukmlen;
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/* KDF output length */
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size_t kdf_outlen;
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} EC_PKEY_CTX;
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static int pkey_ec_init(EVP_PKEY_CTX *ctx)
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{
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EC_PKEY_CTX *dctx;
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dctx = OPENSSL_zalloc(sizeof(*dctx));
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if (dctx == NULL)
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return 0;
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dctx->cofactor_mode = -1;
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dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
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ctx->data = dctx;
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return 1;
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}
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static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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EC_PKEY_CTX *dctx, *sctx;
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if (!pkey_ec_init(dst))
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return 0;
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sctx = src->data;
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dctx = dst->data;
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if (sctx->gen_group) {
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dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
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if (!dctx->gen_group)
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return 0;
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}
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dctx->md = sctx->md;
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if (sctx->co_key) {
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dctx->co_key = EC_KEY_dup(sctx->co_key);
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if (!dctx->co_key)
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return 0;
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}
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dctx->kdf_type = sctx->kdf_type;
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dctx->kdf_md = sctx->kdf_md;
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dctx->kdf_outlen = sctx->kdf_outlen;
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if (sctx->kdf_ukm) {
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dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
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if (!dctx->kdf_ukm)
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return 0;
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} else
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dctx->kdf_ukm = NULL;
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dctx->kdf_ukmlen = sctx->kdf_ukmlen;
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return 1;
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}
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static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
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{
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EC_PKEY_CTX *dctx = ctx->data;
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if (dctx) {
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EC_GROUP_free(dctx->gen_group);
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EC_KEY_free(dctx->co_key);
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OPENSSL_free(dctx->kdf_ukm);
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OPENSSL_free(dctx);
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}
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}
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static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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int ret, type;
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unsigned int sltmp;
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EC_PKEY_CTX *dctx = ctx->data;
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EC_KEY *ec = ctx->pkey->pkey.ec;
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if (!sig) {
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*siglen = ECDSA_size(ec);
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return 1;
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} else if (*siglen < (size_t)ECDSA_size(ec)) {
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ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
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return 0;
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}
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if (dctx->md)
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type = EVP_MD_type(dctx->md);
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else
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type = NID_sha1;
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ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
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if (ret <= 0)
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return ret;
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*siglen = (size_t)sltmp;
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return 1;
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}
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static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
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const unsigned char *sig, size_t siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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int ret, type;
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EC_PKEY_CTX *dctx = ctx->data;
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EC_KEY *ec = ctx->pkey->pkey.ec;
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if (dctx->md)
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type = EVP_MD_type(dctx->md);
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else
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type = NID_sha1;
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ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
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return ret;
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}
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#ifndef OPENSSL_NO_EC
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static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
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size_t *keylen)
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{
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int ret;
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size_t outlen;
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const EC_POINT *pubkey = NULL;
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EC_KEY *eckey;
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EC_PKEY_CTX *dctx = ctx->data;
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if (!ctx->pkey || !ctx->peerkey) {
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ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
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return 0;
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}
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eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
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if (!key) {
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const EC_GROUP *group;
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group = EC_KEY_get0_group(eckey);
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*keylen = (EC_GROUP_get_degree(group) + 7) / 8;
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return 1;
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}
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pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
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/*
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* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
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* an error, the result is truncated.
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*/
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outlen = *keylen;
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ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
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if (ret <= 0)
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return 0;
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*keylen = ret;
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return 1;
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}
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static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
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unsigned char *key, size_t *keylen)
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{
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EC_PKEY_CTX *dctx = ctx->data;
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unsigned char *ktmp = NULL;
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size_t ktmplen;
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int rv = 0;
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if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
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return pkey_ec_derive(ctx, key, keylen);
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if (!key) {
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*keylen = dctx->kdf_outlen;
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return 1;
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}
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if (*keylen != dctx->kdf_outlen)
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return 0;
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if (!pkey_ec_derive(ctx, NULL, &ktmplen))
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return 0;
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ktmp = OPENSSL_malloc(ktmplen);
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if (ktmp == NULL)
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return 0;
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if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
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goto err;
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/* Do KDF stuff */
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if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
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dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
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goto err;
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rv = 1;
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err:
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OPENSSL_clear_free(ktmp, ktmplen);
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return rv;
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}
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#endif
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static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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EC_PKEY_CTX *dctx = ctx->data;
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EC_GROUP *group;
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switch (type) {
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case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
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group = EC_GROUP_new_by_curve_name(p1);
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if (group == NULL) {
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ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
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return 0;
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}
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EC_GROUP_free(dctx->gen_group);
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dctx->gen_group = group;
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return 1;
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case EVP_PKEY_CTRL_EC_PARAM_ENC:
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if (!dctx->gen_group) {
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ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
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return 0;
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}
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EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
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return 1;
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#ifndef OPENSSL_NO_EC
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case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
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if (p1 == -2) {
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if (dctx->cofactor_mode != -1)
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return dctx->cofactor_mode;
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else {
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EC_KEY *ec_key = ctx->pkey->pkey.ec;
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return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 :
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0;
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}
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} else if (p1 < -1 || p1 > 1)
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return -2;
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dctx->cofactor_mode = p1;
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if (p1 != -1) {
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EC_KEY *ec_key = ctx->pkey->pkey.ec;
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if (!ec_key->group)
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return -2;
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/* If cofactor is 1 cofactor mode does nothing */
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if (BN_is_one(ec_key->group->cofactor))
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return 1;
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if (!dctx->co_key) {
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dctx->co_key = EC_KEY_dup(ec_key);
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if (!dctx->co_key)
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return 0;
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}
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if (p1)
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EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
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else
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EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
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} else {
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EC_KEY_free(dctx->co_key);
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dctx->co_key = NULL;
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}
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return 1;
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#endif
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case EVP_PKEY_CTRL_EC_KDF_TYPE:
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if (p1 == -2)
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return dctx->kdf_type;
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if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
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return -2;
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dctx->kdf_type = p1;
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return 1;
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case EVP_PKEY_CTRL_EC_KDF_MD:
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dctx->kdf_md = p2;
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return 1;
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case EVP_PKEY_CTRL_GET_EC_KDF_MD:
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*(const EVP_MD **)p2 = dctx->kdf_md;
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return 1;
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case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
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if (p1 <= 0)
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return -2;
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dctx->kdf_outlen = (size_t)p1;
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return 1;
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case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
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*(int *)p2 = dctx->kdf_outlen;
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return 1;
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case EVP_PKEY_CTRL_EC_KDF_UKM:
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OPENSSL_free(dctx->kdf_ukm);
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dctx->kdf_ukm = p2;
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if (p2)
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dctx->kdf_ukmlen = p1;
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else
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dctx->kdf_ukmlen = 0;
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return 1;
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case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
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*(unsigned char **)p2 = dctx->kdf_ukm;
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return dctx->kdf_ukmlen;
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case EVP_PKEY_CTRL_MD:
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if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
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ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
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return 0;
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}
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dctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_GET_MD:
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*(const EVP_MD **)p2 = dctx->md;
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return 1;
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case EVP_PKEY_CTRL_PEER_KEY:
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/* Default behaviour is OK */
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case EVP_PKEY_CTRL_DIGESTINIT:
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case EVP_PKEY_CTRL_PKCS7_SIGN:
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case EVP_PKEY_CTRL_CMS_SIGN:
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return 1;
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default:
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return -2;
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}
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}
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static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (strcmp(type, "ec_paramgen_curve") == 0) {
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int nid;
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nid = EC_curve_nist2nid(value);
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if (nid == NID_undef)
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nid = OBJ_sn2nid(value);
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if (nid == NID_undef)
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nid = OBJ_ln2nid(value);
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if (nid == NID_undef) {
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ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
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return 0;
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}
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return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
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} else if (strcmp(type, "ec_param_enc") == 0) {
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int param_enc;
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if (strcmp(value, "explicit") == 0)
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param_enc = 0;
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else if (strcmp(value, "named_curve") == 0)
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param_enc = OPENSSL_EC_NAMED_CURVE;
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else
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return -2;
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return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
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} else if (strcmp(type, "ecdh_kdf_md") == 0) {
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const EVP_MD *md;
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if ((md = EVP_get_digestbyname(value)) == NULL) {
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ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
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return 0;
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}
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return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
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} else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
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int co_mode;
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co_mode = atoi(value);
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return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
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}
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return -2;
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}
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static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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EC_KEY *ec = NULL;
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EC_PKEY_CTX *dctx = ctx->data;
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int ret = 0;
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if (dctx->gen_group == NULL) {
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ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
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return 0;
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}
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ec = EC_KEY_new();
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if (ec == NULL)
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return 0;
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ret = EC_KEY_set_group(ec, dctx->gen_group);
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if (ret)
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EVP_PKEY_assign_EC_KEY(pkey, ec);
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else
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EC_KEY_free(ec);
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return ret;
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}
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static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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EC_KEY *ec = NULL;
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EC_PKEY_CTX *dctx = ctx->data;
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if (ctx->pkey == NULL && dctx->gen_group == NULL) {
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ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
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return 0;
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}
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ec = EC_KEY_new();
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if (!ec)
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return 0;
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EVP_PKEY_assign_EC_KEY(pkey, ec);
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if (ctx->pkey) {
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/* Note: if error return, pkey is freed by parent routine */
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if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
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return 0;
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} else {
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if (!EC_KEY_set_group(ec, dctx->gen_group))
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return 0;
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}
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return EC_KEY_generate_key(pkey->pkey.ec);
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}
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const EVP_PKEY_METHOD ec_pkey_meth = {
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EVP_PKEY_EC,
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0,
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pkey_ec_init,
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pkey_ec_copy,
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pkey_ec_cleanup,
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0,
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pkey_ec_paramgen,
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0,
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pkey_ec_keygen,
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0,
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pkey_ec_sign,
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0,
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pkey_ec_verify,
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0, 0,
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0, 0, 0, 0,
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0, 0,
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0, 0,
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0,
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#ifndef OPENSSL_NO_EC
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pkey_ec_kdf_derive,
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#else
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0,
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#endif
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pkey_ec_ctrl,
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pkey_ec_ctrl_str
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};
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