From 068489a27f74c5f5a779aef4618e68e46db746d4 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Wed, 8 Jan 2020 16:16:22 +0000 Subject: [PATCH] Implement the NULL cipher in the default provider Libssl uses the null cipher in certain situations. It should be converted to a provided cipher. Reviewed-by: Shane Lontis Reviewed-by: Richard Levitte (Merged from https://github.com/openssl/openssl/pull/10865) --- crypto/evp/evp_enc.c | 6 +- providers/defltprov.c | 1 + providers/implementations/ciphers/build.info | 4 + .../implementations/ciphers/cipher_null.c | 110 ++++++++++++++++++ .../include/prov/implementations.h | 1 + 5 files changed, 121 insertions(+), 1 deletion(-) create mode 100644 providers/implementations/ciphers/cipher_null.c diff --git a/crypto/evp/evp_enc.c b/crypto/evp/evp_enc.c index 35feec17f6..4687a2b8e4 100644 --- a/crypto/evp/evp_enc.c +++ b/crypto/evp/evp_enc.c @@ -142,6 +142,7 @@ int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, if (tmpcipher->prov == NULL) { switch(tmpcipher->nid) { + case NID_undef: case NID_aes_256_ecb: case NID_aes_192_ecb: case NID_aes_128_ecb: @@ -326,7 +327,10 @@ int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, return 0; #else EVP_CIPHER *provciph = - EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), ""); + EVP_CIPHER_fetch(NULL, + cipher->nid == NID_undef ? "NULL" + : OBJ_nid2sn(cipher->nid), + ""); if (provciph == NULL) { EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); diff --git a/providers/defltprov.c b/providers/defltprov.c index 3220bc5220..166281fae3 100644 --- a/providers/defltprov.c +++ b/providers/defltprov.c @@ -138,6 +138,7 @@ static const OSSL_ALGORITHM deflt_digests[] = { }; static const OSSL_ALGORITHM_CAPABLE deflt_ciphers[] = { + ALG("NULL", null_functions), ALG("AES-256-ECB", aes256ecb_functions), ALG("AES-192-ECB", aes192ecb_functions), ALG("AES-128-ECB", aes128ecb_functions), diff --git a/providers/implementations/ciphers/build.info b/providers/implementations/ciphers/build.info index bff5a2d41f..c45ea00f16 100644 --- a/providers/implementations/ciphers/build.info +++ b/providers/implementations/ciphers/build.info @@ -7,6 +7,7 @@ $COMMON_GOAL=../../libcommon.a +$NULL_GOAL=../../libimplementations.a $AES_GOAL=../../libimplementations.a $TDES_1_GOAL=../../libimplementations.a $TDES_2_GOAL=../../libimplementations.a @@ -35,6 +36,9 @@ IF[{- !$disabled{des} -}] SOURCE[$TDES_1_GOAL]=cipher_tdes.c cipher_tdes_hw.c ENDIF +SOURCE[$NULL_GOAL]=\ + cipher_null.c + SOURCE[$AES_GOAL]=\ cipher_aes.c cipher_aes_hw.c \ cipher_aes_xts.c cipher_aes_xts_hw.c \ diff --git a/providers/implementations/ciphers/cipher_null.c b/providers/implementations/ciphers/cipher_null.c new file mode 100644 index 0000000000..6443e65742 --- /dev/null +++ b/providers/implementations/ciphers/cipher_null.c @@ -0,0 +1,110 @@ +/* + * Copyright 2020 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 "prov/implementations.h" +#include "prov/ciphercommon.h" +#include "prov/providercommonerr.h" + +static OSSL_OP_cipher_newctx_fn null_newctx; +static void *null_newctx(void *provctx) +{ + static int dummy = 0; + + return &dummy; +} + +static OSSL_OP_cipher_freectx_fn null_freectx; +static void null_freectx(void *vctx) +{ +} + +static OSSL_OP_cipher_encrypt_init_fn null_init; +static int null_init(void *vctx, const unsigned char *key, size_t keylen, + const unsigned char *iv, size_t ivlen) +{ + return 1; +} + +static OSSL_OP_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) +{ + if (outsize < inl) + return 0; + if (in != out) + memcpy(out, in, inl); + *outl = inl; + return 1; +} + +static OSSL_OP_cipher_final_fn null_final; +static int null_final(void *vctx, unsigned char *out, size_t *outl, + size_t outsize) +{ + *outl = 0; + return 1; +} + +static OSSL_OP_cipher_get_params_fn null_get_params; +static int null_get_params(OSSL_PARAM params[]) +{ + return 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_PARAM_END +}; + +static OSSL_OP_cipher_gettable_ctx_params_fn null_gettable_ctx_params; +static const OSSL_PARAM *null_gettable_ctx_params(void) +{ + return null_known_gettable_ctx_params; +} + +static OSSL_OP_cipher_get_ctx_params_fn null_get_ctx_params; +static int null_get_ctx_params(void *vctx, OSSL_PARAM params[]) +{ + 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; + } + return 1; +} + +const OSSL_DISPATCH 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_init }, + { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))null_init }, + { 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))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 }, + { 0, NULL } +}; diff --git a/providers/implementations/include/prov/implementations.h b/providers/implementations/include/prov/implementations.h index ed44d68a5a..417f74afea 100644 --- a/providers/implementations/include/prov/implementations.h +++ b/providers/implementations/include/prov/implementations.h @@ -35,6 +35,7 @@ extern const OSSL_DISPATCH wp_functions[]; extern const OSSL_DISPATCH ripemd160_functions[]; /* Ciphers */ +extern const OSSL_DISPATCH null_functions[]; extern const OSSL_DISPATCH aes256ecb_functions[]; extern const OSSL_DISPATCH aes192ecb_functions[]; extern const OSSL_DISPATCH aes128ecb_functions[]; -- 2.25.1