+++ /dev/null
-/*
- * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (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
- */
-
-/*
- * ECDSA low level APIs are deprecated for public use, but still ok for
- * internal use.
- */
-#include "internal/deprecated.h"
-
-#include <string.h> /* memcpy */
-#include <openssl/crypto.h>
-#include <openssl/core_dispatch.h>
-#include <openssl/core_names.h>
-#include <openssl/dsa.h>
-#include <openssl/params.h>
-#include <openssl/evp.h>
-#include <openssl/err.h>
-#include "internal/nelem.h"
-#include "internal/sizes.h"
-#include "internal/cryptlib.h"
-#include "prov/providercommon.h"
-#include "prov/providercommonerr.h"
-#include "prov/implementations.h"
-#include "prov/provider_ctx.h"
-#include "prov/securitycheck.h"
-#include "crypto/ec.h"
-#include "prov/der_ec.h"
-
-static OSSL_FUNC_signature_newctx_fn ecdsa_newctx;
-static OSSL_FUNC_signature_sign_init_fn ecdsa_sign_init;
-static OSSL_FUNC_signature_verify_init_fn ecdsa_verify_init;
-static OSSL_FUNC_signature_sign_fn ecdsa_sign;
-static OSSL_FUNC_signature_verify_fn ecdsa_verify;
-static OSSL_FUNC_signature_digest_sign_init_fn ecdsa_digest_sign_init;
-static OSSL_FUNC_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
-static OSSL_FUNC_signature_digest_sign_final_fn ecdsa_digest_sign_final;
-static OSSL_FUNC_signature_digest_verify_init_fn ecdsa_digest_verify_init;
-static OSSL_FUNC_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
-static OSSL_FUNC_signature_digest_verify_final_fn ecdsa_digest_verify_final;
-static OSSL_FUNC_signature_freectx_fn ecdsa_freectx;
-static OSSL_FUNC_signature_dupctx_fn ecdsa_dupctx;
-static OSSL_FUNC_signature_get_ctx_params_fn ecdsa_get_ctx_params;
-static OSSL_FUNC_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
-static OSSL_FUNC_signature_set_ctx_params_fn ecdsa_set_ctx_params;
-static OSSL_FUNC_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
-static OSSL_FUNC_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
-static OSSL_FUNC_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
-static OSSL_FUNC_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
-static OSSL_FUNC_signature_settable_ctx_md_params_fn ecdsa_settable_ctx_md_params;
-
-/*
- * What's passed as an actual key is defined by the KEYMGMT interface.
- * We happen to know that our KEYMGMT simply passes DSA structures, so
- * we use that here too.
- */
-
-typedef struct {
- OPENSSL_CTX *libctx;
- char *propq;
- EC_KEY *ec;
- char mdname[OSSL_MAX_NAME_SIZE];
-
- /* The Algorithm Identifier of the combined signature algorithm */
- unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
- unsigned char *aid;
- size_t aid_len;
- size_t mdsize;
- int operation;
-
- EVP_MD *md;
- EVP_MD_CTX *mdctx;
- /*
- * Internally used to cache the results of calling the EC group
- * sign_setup() methods which are then passed to the sign operation.
- * This is used by CAVS failure tests to terminate a loop if the signature
- * is not valid.
- * This could of also been done with a simple flag.
- */
- BIGNUM *kinv;
- BIGNUM *r;
-#if !defined(OPENSSL_NO_ACVP_TESTS)
- /*
- * This indicates that KAT (CAVS) test is running. Externally an app will
- * override the random callback such that the generated private key and k
- * are known.
- * Normal operation will loop to choose a new k if the signature is not
- * valid - but for this mode of operation it forces a failure instead.
- */
- unsigned int kattest;
-#endif
-} PROV_ECDSA_CTX;
-
-static void *ecdsa_newctx(void *provctx, const char *propq)
-{
- PROV_ECDSA_CTX *ctx;
-
- if (!ossl_prov_is_running())
- return NULL;
-
- ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
- if (ctx == NULL)
- return NULL;
-
- ctx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
- if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
- OPENSSL_free(ctx);
- ctx = NULL;
- ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
- }
- return ctx;
-}
-
-static int ecdsa_signverify_init(void *vctx, void *ec, int operation)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (!ossl_prov_is_running()
- || ctx == NULL
- || ec == NULL
- || !EC_KEY_up_ref(ec))
- return 0;
- EC_KEY_free(ctx->ec);
- ctx->ec = ec;
- ctx->operation = operation;
- return ec_check_key(ec, operation == EVP_PKEY_OP_SIGN);
-}
-
-static int ecdsa_sign_init(void *vctx, void *ec)
-{
- return ecdsa_signverify_init(vctx, ec, EVP_PKEY_OP_SIGN);
-}
-
-static int ecdsa_verify_init(void *vctx, void *ec)
-{
- return ecdsa_signverify_init(vctx, ec, EVP_PKEY_OP_VERIFY);
-}
-
-static int ecdsa_sign(void *vctx, unsigned char *sig, size_t *siglen,
- size_t sigsize, const unsigned char *tbs, size_t tbslen)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- int ret;
- unsigned int sltmp;
- size_t ecsize = ECDSA_size(ctx->ec);
-
- if (!ossl_prov_is_running())
- return 0;
-
- if (sig == NULL) {
- *siglen = ecsize;
- return 1;
- }
-
-#if !defined(OPENSSL_NO_ACVP_TESTS)
- if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
- return 0;
-#endif
-
- if (sigsize < (size_t)ecsize)
- return 0;
-
- if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
- return 0;
-
- ret = ECDSA_sign_ex(0, tbs, tbslen, sig, &sltmp, ctx->kinv, ctx->r, ctx->ec);
- if (ret <= 0)
- return 0;
-
- *siglen = sltmp;
- return 1;
-}
-
-static int ecdsa_verify(void *vctx, const unsigned char *sig, size_t siglen,
- const unsigned char *tbs, size_t tbslen)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (!ossl_prov_is_running() || (ctx->mdsize != 0 && tbslen != ctx->mdsize))
- return 0;
-
- return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
-}
-
-static void free_md(PROV_ECDSA_CTX *ctx)
-{
- OPENSSL_free(ctx->propq);
- EVP_MD_CTX_free(ctx->mdctx);
- EVP_MD_free(ctx->md);
- ctx->propq = NULL;
- ctx->mdctx = NULL;
- ctx->md = NULL;
- ctx->mdsize = 0;
-}
-
-static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
- void *ec, int operation)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- int md_nid = NID_undef;
- WPACKET pkt;
- int sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
-
- if (!ossl_prov_is_running())
- return 0;
-
- free_md(ctx);
-
- if (!ecdsa_signverify_init(vctx, ec, operation))
- return 0;
-
- ctx->md = EVP_MD_fetch(ctx->libctx, mdname, ctx->propq);
- md_nid = digest_get_approved_nid_with_sha1(ctx->md, sha1_allowed);
- if (md_nid == NID_undef)
- goto error;
-
- ctx->mdsize = EVP_MD_size(ctx->md);
- ctx->mdctx = EVP_MD_CTX_new();
- if (ctx->mdctx == NULL)
- goto error;
-
- /*
- * TODO(3.0) Should we care about DER writing errors?
- * All it really means is that for some reason, there's no
- * AlgorithmIdentifier to be had, but the operation itself is
- * still valid, just as long as it's not used to construct
- * anything that needs an AlgorithmIdentifier.
- */
- ctx->aid_len = 0;
- if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
- && DER_w_algorithmIdentifier_ECDSA_with_MD(&pkt, -1, ctx->ec, md_nid)
- && WPACKET_finish(&pkt)) {
- WPACKET_get_total_written(&pkt, &ctx->aid_len);
- ctx->aid = WPACKET_get_curr(&pkt);
- }
- WPACKET_cleanup(&pkt);
-
- if (!EVP_DigestInit_ex(ctx->mdctx, ctx->md, NULL))
- goto error;
- return 1;
-error:
- free_md(ctx);
- return 0;
-}
-
-static int ecdsa_digest_sign_init(void *vctx, const char *mdname, void *ec)
-{
- return ecdsa_digest_signverify_init(vctx, mdname, ec, EVP_PKEY_OP_SIGN);
-}
-
-static int ecdsa_digest_verify_init(void *vctx, const char *mdname, void *ec)
-{
- return ecdsa_digest_signverify_init(vctx, mdname, ec, EVP_PKEY_OP_VERIFY);
-}
-
-int ecdsa_digest_signverify_update(void *vctx, const unsigned char *data,
- size_t datalen)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (ctx == NULL || ctx->mdctx == NULL)
- return 0;
-
- return EVP_DigestUpdate(ctx->mdctx, data, datalen);
-}
-
-int ecdsa_digest_sign_final(void *vctx, unsigned char *sig, size_t *siglen,
- size_t sigsize)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- unsigned char digest[EVP_MAX_MD_SIZE];
- unsigned int dlen = 0;
-
- if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
- return 0;
-
- /*
- * If sig is NULL then we're just finding out the sig size. Other fields
- * are ignored. Defer to ecdsa_sign.
- */
- if (sig != NULL) {
- /*
- * TODO(3.0): There is the possibility that some externally provided
- * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
- * but that problem is much larger than just in DSA.
- */
- if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
- return 0;
- }
-
- return ecdsa_sign(vctx, sig, siglen, sigsize, digest, (size_t)dlen);
-}
-
-int ecdsa_digest_verify_final(void *vctx, const unsigned char *sig,
- size_t siglen)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- unsigned char digest[EVP_MAX_MD_SIZE];
- unsigned int dlen = 0;
-
- if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
- return 0;
-
- /*
- * TODO(3.0): There is the possibility that some externally provided
- * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
- * but that problem is much larger than just in DSA.
- */
- if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
- return 0;
-
- return ecdsa_verify(ctx, sig, siglen, digest, (size_t)dlen);
-}
-
-static void ecdsa_freectx(void *vctx)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- free_md(ctx);
- EC_KEY_free(ctx->ec);
- BN_clear_free(ctx->kinv);
- BN_clear_free(ctx->r);
- OPENSSL_free(ctx);
-}
-
-static void *ecdsa_dupctx(void *vctx)
-{
- PROV_ECDSA_CTX *srcctx = (PROV_ECDSA_CTX *)vctx;
- PROV_ECDSA_CTX *dstctx;
-
- if (!ossl_prov_is_running())
- return NULL;
-
- dstctx = OPENSSL_zalloc(sizeof(*srcctx));
- if (dstctx == NULL)
- return NULL;
-
- *dstctx = *srcctx;
- dstctx->ec = NULL;
- dstctx->md = NULL;
- dstctx->mdctx = NULL;
-
- if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
- goto err;
- /* Test KATS should not need to be supported */
- if (srcctx->kinv != NULL || srcctx->r != NULL)
- goto err;
- dstctx->ec = srcctx->ec;
-
- if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
- goto err;
- dstctx->md = srcctx->md;
-
- if (srcctx->mdctx != NULL) {
- dstctx->mdctx = EVP_MD_CTX_new();
- if (dstctx->mdctx == NULL
- || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
- goto err;
- }
-
- return dstctx;
- err:
- ecdsa_freectx(dstctx);
- return NULL;
-}
-
-static int ecdsa_get_ctx_params(void *vctx, OSSL_PARAM *params)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- OSSL_PARAM *p;
-
- if (ctx == NULL || params == NULL)
- return 0;
-
- p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
- if (p != NULL && !OSSL_PARAM_set_octet_string(p, ctx->aid, ctx->aid_len))
- return 0;
-
- p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->mdsize))
- return 0;
-
- p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
- if (p != NULL && !OSSL_PARAM_set_utf8_string(p, ctx->md == NULL
- ? ctx->mdname
- : EVP_MD_name(ctx->md)))
- return 0;
-
- return 1;
-}
-
-static const OSSL_PARAM known_gettable_ctx_params[] = {
- OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
- OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
- OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
- OSSL_PARAM_END
-};
-
-static const OSSL_PARAM *ecdsa_gettable_ctx_params(ossl_unused void *provctx)
-{
- return known_gettable_ctx_params;
-}
-
-static int ecdsa_set_ctx_params(void *vctx, const OSSL_PARAM params[])
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- const OSSL_PARAM *p;
- char *mdname;
-
- if (ctx == NULL || params == NULL)
- return 0;
-
- if (ctx->md != NULL) {
- /*
- * You cannot set the digest name/size when doing a DigestSign or
- * DigestVerify.
- */
- return 1;
- }
-#if !defined(OPENSSL_NO_ACVP_TESTS)
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
- if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
- return 0;
-#endif
-
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_get_size_t(p, &ctx->mdsize))
- return 0;
-
- /*
- * We never actually use the mdname, but we do support getting it later.
- * This can be useful for applications that want to know the MD that they
- * previously set.
- */
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
- mdname = ctx->mdname;
- if (p != NULL
- && !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(ctx->mdname)))
- return 0;
-
- return 1;
-}
-
-static const OSSL_PARAM known_settable_ctx_params[] = {
- OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
- OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
- OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
- OSSL_PARAM_END
-};
-
-static const OSSL_PARAM *ecdsa_settable_ctx_params(ossl_unused void *provctx)
-{
- /*
- * TODO(3.0): Should this function return a different set of settable ctx
- * params if the ctx is being used for a DigestSign/DigestVerify? In that
- * case it is not allowed to set the digest size/digest name because the
- * digest is explicitly set as part of the init.
- */
- return known_settable_ctx_params;
-}
-
-static int ecdsa_get_ctx_md_params(void *vctx, OSSL_PARAM *params)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (ctx->mdctx == NULL)
- return 0;
-
- return EVP_MD_CTX_get_params(ctx->mdctx, params);
-}
-
-static const OSSL_PARAM *ecdsa_gettable_ctx_md_params(void *vctx)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (ctx->md == NULL)
- return 0;
-
- return EVP_MD_gettable_ctx_params(ctx->md);
-}
-
-static int ecdsa_set_ctx_md_params(void *vctx, const OSSL_PARAM params[])
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (ctx->mdctx == NULL)
- return 0;
-
- return EVP_MD_CTX_set_params(ctx->mdctx, params);
-}
-
-static const OSSL_PARAM *ecdsa_settable_ctx_md_params(void *vctx)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (ctx->md == NULL)
- return 0;
-
- return EVP_MD_settable_ctx_params(ctx->md);
-}
-
-const OSSL_DISPATCH ecossl_dsa_signature_functions[] = {
- { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))ecdsa_newctx },
- { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))ecdsa_sign_init },
- { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))ecdsa_sign },
- { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))ecdsa_verify_init },
- { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))ecdsa_verify },
- { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
- (void (*)(void))ecdsa_digest_sign_init },
- { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
- (void (*)(void))ecdsa_digest_signverify_update },
- { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
- (void (*)(void))ecdsa_digest_sign_final },
- { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
- (void (*)(void))ecdsa_digest_verify_init },
- { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
- (void (*)(void))ecdsa_digest_signverify_update },
- { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
- (void (*)(void))ecdsa_digest_verify_final },
- { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))ecdsa_freectx },
- { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))ecdsa_dupctx },
- { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))ecdsa_get_ctx_params },
- { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
- (void (*)(void))ecdsa_gettable_ctx_params },
- { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))ecdsa_set_ctx_params },
- { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
- (void (*)(void))ecdsa_settable_ctx_params },
- { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
- (void (*)(void))ecdsa_get_ctx_md_params },
- { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
- (void (*)(void))ecdsa_gettable_ctx_md_params },
- { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
- (void (*)(void))ecdsa_set_ctx_md_params },
- { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
- (void (*)(void))ecdsa_settable_ctx_md_params },
- { 0, NULL }
-};
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