1 /*
2 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /* Internal EVP utility functions */
11
12 #include <openssl/core.h>
13 #include <openssl/evp.h>
14 #include <openssl/err.h>
15 #include <openssl/asn1.h> /* evp_local.h needs it */
16 #include <openssl/safestack.h> /* evp_local.h needs it */
17 #include "crypto/evp.h" /* evp_local.h needs it */
18 #include "evp_local.h"
19
20 /*
21 * EVP_CTRL_RET_UNSUPPORTED = -1 is the returned value from any ctrl function
22 * where the control command isn't supported, and an alternative code path
23 * may be chosen.
24 * Since these functions are used to implement ctrl functionality, we
25 * use the same value, and other callers will have to compensate.
26 */
27 #define PARAM_CHECK(obj, func, errfunc) \
28 if (obj == NULL) \
29 return 0; \
30 if (obj->prov == NULL) \
31 return EVP_CTRL_RET_UNSUPPORTED; \
32 if (obj->func == NULL) { \
33 errfunc(); \
34 return 0; \
35 }
36
37 #define PARAM_FUNC(name, func, type, err) \
38 int name (const type *obj, OSSL_PARAM params[]) \
39 { \
40 PARAM_CHECK(obj, func, err) \
41 return obj->func(params); \
42 }
43
44 #define PARAM_CTX_FUNC(name, func, type, err) \
45 int name (const type *obj, void *algctx, OSSL_PARAM params[]) \
46 { \
47 PARAM_CHECK(obj, func, err) \
48 return obj->func(algctx, params); \
49 }
50
51 #define PARAM_FUNCTIONS(type, \
52 getname, getfunc, \
53 getctxname, getctxfunc, \
54 setctxname, setctxfunc) \
55 PARAM_FUNC(getname, getfunc, type, geterr) \
56 PARAM_CTX_FUNC(getctxname, getctxfunc, type, geterr) \
57 PARAM_CTX_FUNC(setctxname, setctxfunc, type, seterr)
58
59 /*
60 * These error functions are a workaround for the error scripts, which
61 * currently require that XXXerr method appears inside a function (not a macro).
62 */
geterr(void)63 static void geterr(void)
64 {
65 ERR_raise(ERR_LIB_EVP, EVP_R_CANNOT_GET_PARAMETERS);
66 }
67
seterr(void)68 static void seterr(void)
69 {
70 ERR_raise(ERR_LIB_EVP, EVP_R_CANNOT_SET_PARAMETERS);
71 }
72
73 PARAM_FUNCTIONS(EVP_CIPHER,
74 evp_do_ciph_getparams, get_params,
75 evp_do_ciph_ctx_getparams, get_ctx_params,
76 evp_do_ciph_ctx_setparams, set_ctx_params)
77
78 PARAM_FUNCTIONS(EVP_MD,
79 evp_do_md_getparams, get_params,
80 evp_do_md_ctx_getparams, get_ctx_params,
81 evp_do_md_ctx_setparams, set_ctx_params)
82