/* * Copyright 2020-2021 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 #include #include #include #include "prov/implementations.h" #include "prov/ciphercommon.h" #include "prov/providercommon.h" typedef struct prov_cipher_null_ctx_st { int enc; size_t tlsmacsize; const unsigned char *tlsmac; } PROV_CIPHER_NULL_CTX; static OSSL_FUNC_cipher_newctx_fn null_newctx; static void *null_newctx(void *provctx) { if (!ossl_prov_is_running()) return NULL; return OPENSSL_zalloc(sizeof(PROV_CIPHER_NULL_CTX)); } static OSSL_FUNC_cipher_freectx_fn null_freectx; static void null_freectx(void *vctx) { OPENSSL_free(vctx); } static OSSL_FUNC_cipher_encrypt_init_fn null_einit; static int null_einit(void *vctx, const unsigned char *key, size_t keylen, const unsigned char *iv, size_t ivlen, const OSSL_PARAM params[]) { PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx; if (!ossl_prov_is_running()) return 0; ctx->enc = 1; return 1; } static OSSL_FUNC_cipher_decrypt_init_fn null_dinit; static int null_dinit(void *vctx, const unsigned char *key, size_t keylen, const unsigned char *iv, size_t ivlen, const OSSL_PARAM params[]) { if (!ossl_prov_is_running()) return 0; return 1; } static OSSL_FUNC_cipher_cipher_fn null_cipher; static int null_cipher(void *vctx, unsigned char *out, size_t *outl, size_t outsize, const unsigned char *in, size_t inl) { PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx; if (!ossl_prov_is_running()) return 0; if (!ctx->enc && ctx->tlsmacsize > 0) { /* * TLS NULL cipher as per: * https://tools.ietf.org/html/rfc5246#section-6.2.3.1 */ if (inl < ctx->tlsmacsize) return 0; ctx->tlsmac = in + inl - ctx->tlsmacsize; inl -= ctx->tlsmacsize; } if (outsize < inl) return 0; if (in != out) memcpy(out, in, inl); *outl = inl; return 1; } static OSSL_FUNC_cipher_final_fn null_final; static int null_final(void *vctx, unsigned char *out, size_t *outl, size_t outsize) { if (!ossl_prov_is_running()) return 0; *outl = 0; return 1; } static OSSL_FUNC_cipher_get_params_fn null_get_params; static int null_get_params(OSSL_PARAM params[]) { return ossl_cipher_generic_get_params(params, 0, 0, 0, 8, 0); } static const OSSL_PARAM null_known_gettable_ctx_params[] = { OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL), { OSSL_CIPHER_PARAM_TLS_MAC, OSSL_PARAM_OCTET_PTR, NULL, 0, OSSL_PARAM_UNMODIFIED }, OSSL_PARAM_END }; static OSSL_FUNC_cipher_gettable_ctx_params_fn null_gettable_ctx_params; static const OSSL_PARAM *null_gettable_ctx_params(ossl_unused void *cctx, ossl_unused void *provctx) { return null_known_gettable_ctx_params; } static OSSL_FUNC_cipher_get_ctx_params_fn null_get_ctx_params; static int null_get_ctx_params(void *vctx, OSSL_PARAM params[]) { PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx; OSSL_PARAM *p; p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN); if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) { ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); return 0; } p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN); if (p != NULL && !OSSL_PARAM_set_size_t(p, 0)) { ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); return 0; } p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_TLS_MAC); if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, ctx->tlsmac, ctx->tlsmacsize)) { ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); return 0; } return 1; } static const OSSL_PARAM null_known_settable_ctx_params[] = { OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_TLS_MAC_SIZE, NULL), OSSL_PARAM_END }; static OSSL_FUNC_cipher_settable_ctx_params_fn null_settable_ctx_params; static const OSSL_PARAM *null_settable_ctx_params(ossl_unused void *cctx, ossl_unused void *provctx) { return null_known_settable_ctx_params; } static OSSL_FUNC_cipher_set_ctx_params_fn null_set_ctx_params; static int null_set_ctx_params(void *vctx, const OSSL_PARAM params[]) { PROV_CIPHER_NULL_CTX *ctx = (PROV_CIPHER_NULL_CTX *)vctx; const OSSL_PARAM *p; p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_TLS_MAC_SIZE); if (p != NULL) { if (!OSSL_PARAM_get_size_t(p, &ctx->tlsmacsize)) { ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); return 0; } } return 1; } const OSSL_DISPATCH ossl_null_functions[] = { { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void)) null_newctx }, { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) null_freectx }, { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) null_newctx }, { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))null_einit }, { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))null_dinit }, { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))null_cipher }, { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))null_final }, { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))null_cipher }, { OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void)) null_get_params }, { OSSL_FUNC_CIPHER_GETTABLE_PARAMS, (void (*)(void))ossl_cipher_generic_gettable_params }, { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))null_get_ctx_params }, { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, (void (*)(void))null_gettable_ctx_params }, { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, (void (*)(void))null_set_ctx_params }, { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, (void (*)(void))null_settable_ctx_params }, { 0, NULL } };