+++ /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_numbers.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 "prov/providercommonerr.h"
-#include "prov/implementations.h"
-#include "prov/provider_ctx.h"
-#include "crypto/ec.h"
-
-static OSSL_OP_signature_newctx_fn ecdsa_newctx;
-static OSSL_OP_signature_sign_init_fn ecdsa_signature_init;
-static OSSL_OP_signature_verify_init_fn ecdsa_signature_init;
-static OSSL_OP_signature_sign_fn ecdsa_sign;
-static OSSL_OP_signature_verify_fn ecdsa_verify;
-static OSSL_OP_signature_digest_sign_init_fn ecdsa_digest_signverify_init;
-static OSSL_OP_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
-static OSSL_OP_signature_digest_sign_final_fn ecdsa_digest_sign_final;
-static OSSL_OP_signature_digest_verify_init_fn ecdsa_digest_signverify_init;
-static OSSL_OP_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
-static OSSL_OP_signature_digest_verify_final_fn ecdsa_digest_verify_final;
-static OSSL_OP_signature_freectx_fn ecdsa_freectx;
-static OSSL_OP_signature_dupctx_fn ecdsa_dupctx;
-static OSSL_OP_signature_get_ctx_params_fn ecdsa_get_ctx_params;
-static OSSL_OP_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
-static OSSL_OP_signature_set_ctx_params_fn ecdsa_set_ctx_params;
-static OSSL_OP_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
-static OSSL_OP_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
-static OSSL_OP_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
-static OSSL_OP_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
-static OSSL_OP_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;
- EC_KEY *ec;
- char mdname[OSSL_MAX_NAME_SIZE];
-
- /* The Algorithm Identifier of the combined signature algorithm */
- unsigned char aid[OSSL_MAX_ALGORITHM_ID_SIZE];
- size_t aid_len;
- size_t mdsize;
-
- EVP_MD *md;
- EVP_MD_CTX *mdctx;
- /*
- * 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;
- /*
- * 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;
-} PROV_ECDSA_CTX;
-
-static void *ecdsa_newctx(void *provctx)
-{
- PROV_ECDSA_CTX *ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
-
- if (ctx == NULL)
- return NULL;
-
- ctx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
- return ctx;
-}
-
-static int ecdsa_signature_init(void *vctx, void *ec)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
-
- if (ctx == NULL || ec == NULL || !EC_KEY_up_ref(ec))
- return 0;
- EC_KEY_free(ctx->ec);
- ctx->ec = ec;
- return 1;
-}
-
-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 (sig == NULL) {
- *siglen = ecsize;
- return 1;
- }
-
- if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
- return 0;
-
- 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 (ctx->mdsize != 0 && tbslen != ctx->mdsize)
- return 0;
-
- return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
-}
-
-static int get_md_nid(const EVP_MD *md)
-{
- /*
- * Because the ECDSA library deals with NIDs, we need to translate.
- * We do so using EVP_MD_is_a(), and therefore need a name to NID
- * map.
- */
- static const OSSL_ITEM name_to_nid[] = {
- { NID_sha1, OSSL_DIGEST_NAME_SHA1 },
- { NID_sha224, OSSL_DIGEST_NAME_SHA2_224 },
- { NID_sha256, OSSL_DIGEST_NAME_SHA2_256 },
- { NID_sha384, OSSL_DIGEST_NAME_SHA2_384 },
- { NID_sha512, OSSL_DIGEST_NAME_SHA2_512 },
- { NID_sha3_224, OSSL_DIGEST_NAME_SHA3_224 },
- { NID_sha3_256, OSSL_DIGEST_NAME_SHA3_256 },
- { NID_sha3_384, OSSL_DIGEST_NAME_SHA3_384 },
- { NID_sha3_512, OSSL_DIGEST_NAME_SHA3_512 },
- /* TODO - Add SHAKE OIDS when they are standardized */
-
- };
- size_t i;
- int mdnid = NID_undef;
-
- if (md == NULL)
- goto end;
-
- for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
- if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
- mdnid = (int)name_to_nid[i].id;
- break;
- }
- }
-
- if (mdnid == NID_undef)
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
-
- end:
- return mdnid;
-}
-
-static void free_md(PROV_ECDSA_CTX *ctx)
-{
- EVP_MD_CTX_free(ctx->mdctx);
- EVP_MD_free(ctx->md);
- ctx->mdctx = NULL;
- ctx->md = NULL;
- ctx->mdsize = 0;
-}
-
-static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
- const char *props, void *ec)
-{
- PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
- size_t algorithmidentifier_len = 0;
- const unsigned char *algorithmidentifier;
-
- free_md(ctx);
-
- if (!ecdsa_signature_init(vctx, ec))
- return 0;
-
- ctx->md = EVP_MD_fetch(ctx->libctx, mdname, props);
- algorithmidentifier =
- ecdsa_algorithmidentifier_encoding(get_md_nid(ctx->md),
- &algorithmidentifier_len);
- if (algorithmidentifier == NULL)
- goto error;
-
- ctx->mdsize = EVP_MD_size(ctx->md);
- ctx->mdctx = EVP_MD_CTX_new();
- if (ctx->mdctx == NULL)
- goto error;
-
- memcpy(ctx->aid, algorithmidentifier, algorithmidentifier_len);
- ctx->aid_len = algorithmidentifier_len;
-
- if (!EVP_DigestInit_ex(ctx->mdctx, ctx->md, NULL))
- goto error;
- return 1;
-error:
- free_md(ctx);
- return 0;
-}
-
-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 (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 (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;
-
- 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(void)
-{
- 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;
- }
-
- p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
- if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
- return 0;
-
- 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(void)
-{
- /*
- * 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 ecdsa_signature_functions[] = {
- { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))ecdsa_newctx },
- { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))ecdsa_signature_init },
- { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))ecdsa_sign },
- { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))ecdsa_signature_init },
- { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))ecdsa_verify },
- { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
- (void (*)(void))ecdsa_digest_signverify_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_signverify_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 }
-};
projects / openssl.git / blobdiff