| /* |
| * Copyright 2006-2021 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 <stdio.h> |
| #include "internal/cryptlib.h" |
| #include <openssl/evp.h> |
| #include <openssl/objects.h> |
| #include <openssl/x509.h> |
| #include "crypto/evp.h" |
| #include "internal/provider.h" |
| #include "internal/numbers.h" /* includes SIZE_MAX */ |
| #include "evp_local.h" |
| |
| #ifndef FIPS_MODULE |
| |
| static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen) |
| { |
| ERR_raise(ERR_LIB_EVP, EVP_R_ONLY_ONESHOT_SUPPORTED); |
| return 0; |
| } |
| |
| /* |
| * If we get the "NULL" md then the name comes back as "UNDEF". We want to use |
| * NULL for this. |
| */ |
| static const char *canon_mdname(const char *mdname) |
| { |
| if (mdname != NULL && strcmp(mdname, "UNDEF") == 0) |
| return NULL; |
| |
| return mdname; |
| } |
| |
| static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| const EVP_MD *type, const char *mdname, |
| OSSL_LIB_CTX *libctx, const char *props, |
| ENGINE *e, EVP_PKEY *pkey, int ver, |
| OSSL_PARAM params[]) |
| { |
| EVP_PKEY_CTX *locpctx = NULL; |
| EVP_SIGNATURE *signature = NULL; |
| EVP_KEYMGMT *tmp_keymgmt = NULL; |
| const char *supported_sig = NULL; |
| char locmdname[80] = ""; /* 80 chars should be enough */ |
| void *provkey = NULL; |
| int ret; |
| |
| if (ctx->algctx != NULL) { |
| if (!ossl_assert(ctx->digest != NULL)) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| if (ctx->digest->freectx != NULL) |
| ctx->digest->freectx(ctx->algctx); |
| ctx->algctx = NULL; |
| } |
| |
| if (ctx->pctx == NULL) { |
| if (e == NULL) |
| ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props); |
| else |
| ctx->pctx = EVP_PKEY_CTX_new(pkey, e); |
| } |
| if (ctx->pctx == NULL) |
| return 0; |
| |
| locpctx = ctx->pctx; |
| evp_pkey_ctx_free_old_ops(locpctx); |
| |
| if (props == NULL) |
| props = locpctx->propquery; |
| |
| ERR_set_mark(); |
| |
| if (evp_pkey_ctx_is_legacy(locpctx)) |
| goto legacy; |
| |
| /* |
| * Ensure that the key is provided, either natively, or as a cached export. |
| */ |
| tmp_keymgmt = locpctx->keymgmt; |
| provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx, |
| &tmp_keymgmt, locpctx->propquery); |
| if (provkey == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| goto err; |
| } |
| if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) { |
| ERR_clear_last_mark(); |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| goto err; |
| } |
| EVP_KEYMGMT_free(locpctx->keymgmt); |
| locpctx->keymgmt = tmp_keymgmt; |
| |
| if (locpctx->keymgmt->query_operation_name != NULL) |
| supported_sig = |
| locpctx->keymgmt->query_operation_name(OSSL_OP_SIGNATURE); |
| |
| /* |
| * If we didn't get a supported sig, assume there is one with the |
| * same name as the key type. |
| */ |
| if (supported_sig == NULL) |
| supported_sig = locpctx->keytype; |
| |
| /* |
| * Because we cleared out old ops, we shouldn't need to worry about |
| * checking if signature is already there. |
| */ |
| signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig, |
| locpctx->propquery); |
| |
| if (signature == NULL |
| || (EVP_KEYMGMT_get0_provider(locpctx->keymgmt) |
| != EVP_SIGNATURE_get0_provider(signature))) { |
| /* |
| * We don't need to free ctx->keymgmt here, as it's not necessarily |
| * tied to this operation. It will be freed by EVP_PKEY_CTX_free(). |
| */ |
| EVP_SIGNATURE_free(signature); |
| goto legacy; |
| } |
| |
| /* |
| * If we don't have the full support we need with provided methods, |
| * let's go see if legacy does. |
| */ |
| ERR_pop_to_mark(); |
| |
| /* No more legacy from here down to legacy: */ |
| |
| if (pctx != NULL) |
| *pctx = locpctx; |
| |
| locpctx->op.sig.signature = signature; |
| locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX |
| : EVP_PKEY_OP_SIGNCTX; |
| locpctx->op.sig.algctx |
| = signature->newctx(ossl_provider_ctx(signature->prov), props); |
| if (locpctx->op.sig.algctx == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| goto err; |
| } |
| if (type != NULL) { |
| ctx->reqdigest = type; |
| if (mdname == NULL) |
| mdname = canon_mdname(EVP_MD_get0_name(type)); |
| } else { |
| if (mdname == NULL) { |
| if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey, |
| locmdname, |
| sizeof(locmdname)) > 0) { |
| mdname = canon_mdname(locmdname); |
| } |
| } |
| |
| if (mdname != NULL) { |
| /* |
| * We're about to get a new digest so clear anything associated with |
| * an old digest. |
| */ |
| evp_md_ctx_clear_digest(ctx, 1); |
| |
| /* legacy code support for engines */ |
| ERR_set_mark(); |
| /* |
| * This might be requested by a later call to EVP_MD_CTX_get0_md(). |
| * In that case the "explicit fetch" rules apply for that |
| * function (as per man pages), i.e. the ref count is not updated |
| * so the EVP_MD should not be used beyound the lifetime of the |
| * EVP_MD_CTX. |
| */ |
| ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props); |
| if (ctx->fetched_digest != NULL) { |
| ctx->digest = ctx->reqdigest = ctx->fetched_digest; |
| } else { |
| /* legacy engine support : remove the mark when this is deleted */ |
| ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname); |
| if (ctx->digest == NULL) { |
| (void)ERR_clear_last_mark(); |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| goto err; |
| } |
| } |
| (void)ERR_pop_to_mark(); |
| } |
| } |
| |
| if (ver) { |
| if (signature->digest_verify_init == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| goto err; |
| } |
| ret = signature->digest_verify_init(locpctx->op.sig.algctx, |
| mdname, provkey, params); |
| } else { |
| if (signature->digest_sign_init == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| goto err; |
| } |
| ret = signature->digest_sign_init(locpctx->op.sig.algctx, |
| mdname, provkey, params); |
| } |
| |
| goto end; |
| |
| err: |
| evp_pkey_ctx_free_old_ops(locpctx); |
| locpctx->operation = EVP_PKEY_OP_UNDEFINED; |
| return 0; |
| |
| legacy: |
| /* |
| * If we don't have the full support we need with provided methods, |
| * let's go see if legacy does. |
| */ |
| ERR_pop_to_mark(); |
| |
| if (type == NULL && mdname != NULL) |
| type = evp_get_digestbyname_ex(locpctx->libctx, mdname); |
| |
| if (ctx->pctx->pmeth == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE); |
| return 0; |
| } |
| |
| if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) { |
| |
| if (type == NULL) { |
| int def_nid; |
| if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0) |
| type = EVP_get_digestbynid(def_nid); |
| } |
| |
| if (type == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST); |
| return 0; |
| } |
| } |
| |
| if (ver) { |
| if (ctx->pctx->pmeth->verifyctx_init) { |
| if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0) |
| return 0; |
| ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; |
| } else if (ctx->pctx->pmeth->digestverify != 0) { |
| ctx->pctx->operation = EVP_PKEY_OP_VERIFY; |
| ctx->update = update; |
| } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) { |
| return 0; |
| } |
| } else { |
| if (ctx->pctx->pmeth->signctx_init) { |
| if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) |
| return 0; |
| ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; |
| } else if (ctx->pctx->pmeth->digestsign != 0) { |
| ctx->pctx->operation = EVP_PKEY_OP_SIGN; |
| ctx->update = update; |
| } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) { |
| return 0; |
| } |
| } |
| if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) |
| return 0; |
| if (pctx) |
| *pctx = ctx->pctx; |
| if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) |
| return 1; |
| if (!EVP_DigestInit_ex(ctx, type, e)) |
| return 0; |
| /* |
| * This indicates the current algorithm requires |
| * special treatment before hashing the tbs-message. |
| */ |
| ctx->pctx->flag_call_digest_custom = 0; |
| if (ctx->pctx->pmeth->digest_custom != NULL) |
| ctx->pctx->flag_call_digest_custom = 1; |
| |
| ret = 1; |
| |
| end: |
| #ifndef FIPS_MODULE |
| if (ret > 0) |
| ret = evp_pkey_ctx_use_cached_data(locpctx); |
| #endif |
| |
| return ret > 0 ? 1 : 0; |
| } |
| |
| int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| const char *mdname, OSSL_LIB_CTX *libctx, |
| const char *props, EVP_PKEY *pkey, |
| OSSL_PARAM params[]) |
| { |
| return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0, |
| params); |
| } |
| |
| int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) |
| { |
| return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0, |
| NULL); |
| } |
| |
| int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| const char *mdname, OSSL_LIB_CTX *libctx, |
| const char *props, EVP_PKEY *pkey, |
| OSSL_PARAM params[]) |
| { |
| return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1, |
| params); |
| } |
| |
| int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, |
| const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) |
| { |
| return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1, |
| NULL); |
| } |
| #endif /* FIPS_MDOE */ |
| |
| int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize) |
| { |
| EVP_PKEY_CTX *pctx = ctx->pctx; |
| |
| if (pctx == NULL |
| || pctx->operation != EVP_PKEY_OP_SIGNCTX |
| || pctx->op.sig.algctx == NULL |
| || pctx->op.sig.signature == NULL) |
| goto legacy; |
| |
| if (pctx->op.sig.signature->digest_sign_update == NULL) { |
| ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| return 0; |
| } |
| |
| return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.algctx, |
| data, dsize); |
| |
| legacy: |
| if (pctx != NULL) { |
| /* do_sigver_init() checked that |digest_custom| is non-NULL */ |
| if (pctx->flag_call_digest_custom |
| && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) |
| return 0; |
| pctx->flag_call_digest_custom = 0; |
| } |
| |
| return EVP_DigestUpdate(ctx, data, dsize); |
| } |
| |
| int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize) |
| { |
| EVP_PKEY_CTX *pctx = ctx->pctx; |
| |
| if (pctx == NULL |
| || pctx->operation != EVP_PKEY_OP_VERIFYCTX |
| || pctx->op.sig.algctx == NULL |
| || pctx->op.sig.signature == NULL) |
| goto legacy; |
| |
| if (pctx->op.sig.signature->digest_verify_update == NULL) { |
| ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| return 0; |
| } |
| |
| return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.algctx, |
| data, dsize); |
| |
| legacy: |
| if (pctx != NULL) { |
| /* do_sigver_init() checked that |digest_custom| is non-NULL */ |
| if (pctx->flag_call_digest_custom |
| && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) |
| return 0; |
| pctx->flag_call_digest_custom = 0; |
| } |
| |
| return EVP_DigestUpdate(ctx, data, dsize); |
| } |
| |
| #ifndef FIPS_MODULE |
| int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, |
| size_t *siglen) |
| { |
| int sctx = 0, r = 0; |
| EVP_PKEY_CTX *pctx = ctx->pctx; |
| |
| if (pctx == NULL |
| || pctx->operation != EVP_PKEY_OP_SIGNCTX |
| || pctx->op.sig.algctx == NULL |
| || pctx->op.sig.signature == NULL) |
| goto legacy; |
| |
| return pctx->op.sig.signature->digest_sign_final(pctx->op.sig.algctx, |
| sigret, siglen, SIZE_MAX); |
| |
| legacy: |
| if (pctx == NULL || pctx->pmeth == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| |
| /* do_sigver_init() checked that |digest_custom| is non-NULL */ |
| if (pctx->flag_call_digest_custom |
| && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) |
| return 0; |
| pctx->flag_call_digest_custom = 0; |
| |
| if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) { |
| if (sigret == NULL) |
| return pctx->pmeth->signctx(pctx, sigret, siglen, ctx); |
| if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) |
| r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx); |
| else { |
| EVP_PKEY_CTX *dctx = EVP_PKEY_CTX_dup(pctx); |
| |
| if (dctx == NULL) |
| return 0; |
| r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx); |
| EVP_PKEY_CTX_free(dctx); |
| } |
| return r; |
| } |
| if (pctx->pmeth->signctx != NULL) |
| sctx = 1; |
| else |
| sctx = 0; |
| if (sigret != NULL) { |
| unsigned char md[EVP_MAX_MD_SIZE]; |
| unsigned int mdlen = 0; |
| |
| if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) { |
| if (sctx) |
| r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx); |
| else |
| r = EVP_DigestFinal_ex(ctx, md, &mdlen); |
| } else { |
| EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new(); |
| |
| if (tmp_ctx == NULL) |
| return 0; |
| if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) { |
| EVP_MD_CTX_free(tmp_ctx); |
| return 0; |
| } |
| if (sctx) |
| r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx, |
| sigret, siglen, tmp_ctx); |
| else |
| r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen); |
| EVP_MD_CTX_free(tmp_ctx); |
| } |
| if (sctx || !r) |
| return r; |
| if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0) |
| return 0; |
| } else { |
| if (sctx) { |
| if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0) |
| return 0; |
| } else { |
| int s = EVP_MD_get_size(ctx->digest); |
| |
| if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0) |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen, |
| const unsigned char *tbs, size_t tbslen) |
| { |
| EVP_PKEY_CTX *pctx = ctx->pctx; |
| |
| if (pctx != NULL |
| && pctx->operation == EVP_PKEY_OP_SIGNCTX |
| && pctx->op.sig.algctx != NULL |
| && pctx->op.sig.signature != NULL) { |
| if (pctx->op.sig.signature->digest_sign != NULL) |
| return pctx->op.sig.signature->digest_sign(pctx->op.sig.algctx, |
| sigret, siglen, SIZE_MAX, |
| tbs, tbslen); |
| } else { |
| /* legacy */ |
| if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL) |
| return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen); |
| } |
| |
| if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0) |
| return 0; |
| return EVP_DigestSignFinal(ctx, sigret, siglen); |
| } |
| |
| int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, |
| size_t siglen) |
| { |
| unsigned char md[EVP_MAX_MD_SIZE]; |
| int r = 0; |
| unsigned int mdlen = 0; |
| int vctx = 0; |
| EVP_PKEY_CTX *pctx = ctx->pctx; |
| |
| if (pctx == NULL |
| || pctx->operation != EVP_PKEY_OP_VERIFYCTX |
| || pctx->op.sig.algctx == NULL |
| || pctx->op.sig.signature == NULL) |
| goto legacy; |
| |
| return pctx->op.sig.signature->digest_verify_final(pctx->op.sig.algctx, |
| sig, siglen); |
| |
| legacy: |
| if (pctx == NULL || pctx->pmeth == NULL) { |
| ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR); |
| return 0; |
| } |
| |
| /* do_sigver_init() checked that |digest_custom| is non-NULL */ |
| if (pctx->flag_call_digest_custom |
| && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx)) |
| return 0; |
| pctx->flag_call_digest_custom = 0; |
| |
| if (pctx->pmeth->verifyctx != NULL) |
| vctx = 1; |
| else |
| vctx = 0; |
| if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) { |
| if (vctx) |
| r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx); |
| else |
| r = EVP_DigestFinal_ex(ctx, md, &mdlen); |
| } else { |
| EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new(); |
| if (tmp_ctx == NULL) |
| return -1; |
| if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) { |
| EVP_MD_CTX_free(tmp_ctx); |
| return -1; |
| } |
| if (vctx) |
| r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx, |
| sig, siglen, tmp_ctx); |
| else |
| r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen); |
| EVP_MD_CTX_free(tmp_ctx); |
| } |
| if (vctx || !r) |
| return r; |
| return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen); |
| } |
| |
| int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret, |
| size_t siglen, const unsigned char *tbs, size_t tbslen) |
| { |
| EVP_PKEY_CTX *pctx = ctx->pctx; |
| |
| if (pctx != NULL |
| && pctx->operation == EVP_PKEY_OP_VERIFYCTX |
| && pctx->op.sig.algctx != NULL |
| && pctx->op.sig.signature != NULL) { |
| if (pctx->op.sig.signature->digest_verify != NULL) |
| return pctx->op.sig.signature->digest_verify(pctx->op.sig.algctx, |
| sigret, siglen, |
| tbs, tbslen); |
| } else { |
| /* legacy */ |
| if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL) |
| return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen); |
| } |
| |
| if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0) |
| return -1; |
| return EVP_DigestVerifyFinal(ctx, sigret, siglen); |
| } |
| #endif /* FIPS_MODULE */ |
