+++ /dev/null
-/*
- * Copyright 2019 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
- */
-
-#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 "prov/implementations.h"
-#include "internal/provider_ctx.h"
-
-static OSSL_OP_signature_newctx_fn dsa_newctx;
-static OSSL_OP_signature_sign_init_fn dsa_signature_init;
-static OSSL_OP_signature_verify_init_fn dsa_signature_init;
-static OSSL_OP_signature_sign_fn dsa_sign;
-static OSSL_OP_signature_verify_fn dsa_verify;
-static OSSL_OP_signature_digest_sign_init_fn dsa_digest_signverify_init;
-static OSSL_OP_signature_digest_sign_update_fn dsa_digest_signverify_update;
-static OSSL_OP_signature_digest_sign_final_fn dsa_digest_sign_final;
-static OSSL_OP_signature_digest_verify_init_fn dsa_digest_signverify_init;
-static OSSL_OP_signature_digest_verify_update_fn dsa_digest_signverify_update;
-static OSSL_OP_signature_digest_verify_final_fn dsa_digest_verify_final;
-static OSSL_OP_signature_freectx_fn dsa_freectx;
-static OSSL_OP_signature_dupctx_fn dsa_dupctx;
-static OSSL_OP_signature_get_ctx_params_fn dsa_get_ctx_params;
-static OSSL_OP_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
-static OSSL_OP_signature_set_ctx_params_fn dsa_set_ctx_params;
-static OSSL_OP_signature_settable_ctx_params_fn dsa_settable_ctx_params;
-static OSSL_OP_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;
-static OSSL_OP_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;
-static OSSL_OP_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;
-static OSSL_OP_signature_settable_ctx_md_params_fn dsa_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;
- DSA *dsa;
- size_t mdsize;
- /* Should be big enough */
- char mdname[80];
- EVP_MD *md;
- EVP_MD_CTX *mdctx;
-} PROV_DSA_CTX;
-
-static void *dsa_newctx(void *provctx)
-{
- PROV_DSA_CTX *pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
-
- if (pdsactx == NULL)
- return NULL;
-
- pdsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
- return pdsactx;
-}
-
-static int dsa_signature_init(void *vpdsactx, void *vdsa)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- if (pdsactx == NULL || vdsa == NULL || !DSA_up_ref(vdsa))
- return 0;
- DSA_free(pdsactx->dsa);
- pdsactx->dsa = vdsa;
- return 1;
-}
-
-static int dsa_sign(void *vpdsactx, unsigned char *sig, size_t *siglen,
- size_t sigsize, const unsigned char *tbs, size_t tbslen)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
- int ret;
- unsigned int sltmp;
- size_t dsasize = DSA_size(pdsactx->dsa);
-
- if (sig == NULL) {
- *siglen = dsasize;
- return 1;
- }
-
- if (sigsize < (size_t)dsasize)
- return 0;
-
- if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
- return 0;
-
- ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
-
- if (ret <= 0)
- return 0;
-
- *siglen = sltmp;
- return 1;
-}
-
-static int dsa_verify(void *vpdsactx, const unsigned char *sig, size_t siglen,
- const unsigned char *tbs, size_t tbslen)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
- return 0;
-
- return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
-}
-
-static int dsa_digest_signverify_init(void *vpdsactx, const char *mdname,
- const char *props, void *vdsa)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
- EVP_MD *md;
-
- if (!dsa_signature_init(vpdsactx, vdsa))
- return 0;
-
- md = EVP_MD_fetch(pdsactx->libctx, mdname, props);
- if (md == NULL)
- return 0;
- pdsactx->md = md;
- pdsactx->mdsize = EVP_MD_size(md);
- pdsactx->mdctx = EVP_MD_CTX_new();
- if (pdsactx->mdctx == NULL)
- return 0;
-
- if (!EVP_DigestInit_ex(pdsactx->mdctx, md, NULL))
- return 0;
-
- return 1;
-}
-
-int dsa_digest_signverify_update(void *vpdsactx, const unsigned char *data,
- size_t datalen)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- if (pdsactx == NULL || pdsactx->mdctx == NULL)
- return 0;
-
- return EVP_DigestUpdate(pdsactx->mdctx, data, datalen);
-}
-
-int dsa_digest_sign_final(void *vpdsactx, unsigned char *sig, size_t *siglen,
- size_t sigsize)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
- unsigned char digest[EVP_MAX_MD_SIZE];
- unsigned int dlen = 0;
-
- if (pdsactx == NULL || pdsactx->mdctx == NULL)
- return 0;
-
- /*
- * If sig is NULL then we're just finding out the sig size. Other fields
- * are ignored. Defer to dsa_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(pdsactx->mdctx, digest, &dlen))
- return 0;
- }
-
- return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
-}
-
-
-int dsa_digest_verify_final(void *vpdsactx, const unsigned char *sig,
- size_t siglen)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
- unsigned char digest[EVP_MAX_MD_SIZE];
- unsigned int dlen = 0;
-
- if (pdsactx == NULL || pdsactx->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(pdsactx->mdctx, digest, &dlen))
- return 0;
-
- return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
-}
-
-static void dsa_freectx(void *vpdsactx)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- DSA_free(pdsactx->dsa);
- EVP_MD_CTX_free(pdsactx->mdctx);
- EVP_MD_free(pdsactx->md);
-
- OPENSSL_free(pdsactx);
-}
-
-static void *dsa_dupctx(void *vpdsactx)
-{
- PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;
- PROV_DSA_CTX *dstctx;
-
- dstctx = OPENSSL_zalloc(sizeof(*srcctx));
- if (dstctx == NULL)
- return NULL;
-
- *dstctx = *srcctx;
- dstctx->dsa = NULL;
- dstctx->md = NULL;
- dstctx->mdctx = NULL;
-
- if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))
- goto err;
- dstctx->dsa = srcctx->dsa;
-
- 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:
- dsa_freectx(dstctx);
- return NULL;
-}
-
-static int dsa_get_ctx_params(void *vpdsactx, OSSL_PARAM *params)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
- OSSL_PARAM *p;
-
- if (pdsactx == NULL || params == NULL)
- return 0;
-
- p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_set_size_t(p, pdsactx->mdsize))
- return 0;
-
- p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
- if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->md == NULL
- ? pdsactx->mdname
- : EVP_MD_name(pdsactx->md)))
- return 0;
-
- return 1;
-}
-
-static const OSSL_PARAM known_gettable_ctx_params[] = {
- 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 *dsa_gettable_ctx_params(void)
-{
- return known_gettable_ctx_params;
-}
-
-static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
- const OSSL_PARAM *p;
- char *mdname;
-
- if (pdsactx == NULL || params == NULL)
- return 0;
-
- if (pdsactx->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_DIGEST_SIZE);
- if (p != NULL && !OSSL_PARAM_get_size_t(p, &pdsactx->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 = pdsactx->mdname;
- if (p != NULL
- && !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(pdsactx->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_END
-};
-
-static const OSSL_PARAM *dsa_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 dsa_get_ctx_md_params(void *vpdsactx, OSSL_PARAM *params)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- if (pdsactx->mdctx == NULL)
- return 0;
-
- return EVP_MD_CTX_get_params(pdsactx->mdctx, params);
-}
-
-static const OSSL_PARAM *dsa_gettable_ctx_md_params(void *vpdsactx)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- if (pdsactx->md == NULL)
- return 0;
-
- return EVP_MD_gettable_ctx_params(pdsactx->md);
-}
-
-static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- if (pdsactx->mdctx == NULL)
- return 0;
-
- return EVP_MD_CTX_set_params(pdsactx->mdctx, params);
-}
-
-static const OSSL_PARAM *dsa_settable_ctx_md_params(void *vpdsactx)
-{
- PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
-
- if (pdsactx->md == NULL)
- return 0;
-
- return EVP_MD_settable_ctx_params(pdsactx->md);
-}
-
-const OSSL_DISPATCH dsa_signature_functions[] = {
- { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
- { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_signature_init },
- { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
- { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_signature_init },
- { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
- { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
- (void (*)(void))dsa_digest_signverify_init },
- { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
- (void (*)(void))dsa_digest_signverify_update },
- { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
- (void (*)(void))dsa_digest_sign_final },
- { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
- (void (*)(void))dsa_digest_signverify_init },
- { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
- (void (*)(void))dsa_digest_signverify_update },
- { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
- (void (*)(void))dsa_digest_verify_final },
- { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
- { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
- { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
- { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
- (void (*)(void))dsa_gettable_ctx_params },
- { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
- { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
- (void (*)(void))dsa_settable_ctx_params },
- { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
- (void (*)(void))dsa_get_ctx_md_params },
- { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
- (void (*)(void))dsa_gettable_ctx_md_params },
- { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
- (void (*)(void))dsa_set_ctx_md_params },
- { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
- (void (*)(void))dsa_settable_ctx_md_params },
- { 0, NULL }
-};
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