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 */ 63 static void geterr(void) 64 { 65 ERR_raise(ERR_LIB_EVP, EVP_R_CANNOT_GET_PARAMETERS); 66 } 67 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