2 * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* Dispatch functions for chacha20 cipher */
12 #include "cipher_chacha20.h"
13 #include "prov/implementations.h"
14 #include "prov/providercommonerr.h"
16 #define CHACHA20_KEYLEN (CHACHA_KEY_SIZE)
17 #define CHACHA20_BLKLEN (1)
18 #define CHACHA20_IVLEN (CHACHA_CTR_SIZE)
19 /* TODO(3.0) Figure out what flags are required */
20 #define CHACHA20_FLAGS (EVP_CIPH_CUSTOM_IV | EVP_CIPH_ALWAYS_CALL_INIT)
22 static OSSL_FUNC_cipher_newctx_fn chacha20_newctx;
23 static OSSL_FUNC_cipher_freectx_fn chacha20_freectx;
24 static OSSL_FUNC_cipher_get_params_fn chacha20_get_params;
25 static OSSL_FUNC_cipher_get_ctx_params_fn chacha20_get_ctx_params;
26 static OSSL_FUNC_cipher_set_ctx_params_fn chacha20_set_ctx_params;
27 static OSSL_FUNC_cipher_gettable_ctx_params_fn chacha20_gettable_ctx_params;
28 static OSSL_FUNC_cipher_settable_ctx_params_fn chacha20_settable_ctx_params;
29 #define chacha20_cipher cipher_generic_cipher
30 #define chacha20_update cipher_generic_stream_update
31 #define chacha20_final cipher_generic_stream_final
32 #define chacha20_gettable_params cipher_generic_gettable_params
34 void chacha20_initctx(PROV_CHACHA20_CTX *ctx)
36 cipher_generic_initkey(ctx, CHACHA20_KEYLEN * 8,
40 PROV_CIPHER_HW_chacha20(CHACHA20_KEYLEN * 8),
44 static void *chacha20_newctx(void *provctx)
46 PROV_CHACHA20_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
49 chacha20_initctx(ctx);
53 static void chacha20_freectx(void *vctx)
55 PROV_CHACHA20_CTX *ctx = (PROV_CHACHA20_CTX *)vctx;
58 cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
59 OPENSSL_clear_free(ctx, sizeof(*ctx));
63 static int chacha20_get_params(OSSL_PARAM params[])
65 return cipher_generic_get_params(params, 0, CHACHA20_FLAGS,
71 static int chacha20_get_ctx_params(void *vctx, OSSL_PARAM params[])
75 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
76 if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_IVLEN)) {
77 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
80 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
81 if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_KEYLEN)) {
82 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
89 static const OSSL_PARAM chacha20_known_gettable_ctx_params[] = {
90 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
91 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
94 const OSSL_PARAM *chacha20_gettable_ctx_params(void)
96 return chacha20_known_gettable_ctx_params;
99 static int chacha20_set_ctx_params(void *vctx, const OSSL_PARAM params[])
104 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
106 if (!OSSL_PARAM_get_size_t(p, &len)) {
107 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
110 if (len != CHACHA20_KEYLEN) {
111 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
115 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN);
117 if (!OSSL_PARAM_get_size_t(p, &len)) {
118 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
121 if (len != CHACHA20_IVLEN) {
122 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
129 static const OSSL_PARAM chacha20_known_settable_ctx_params[] = {
130 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
131 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
134 const OSSL_PARAM *chacha20_settable_ctx_params(void)
136 return chacha20_known_settable_ctx_params;
139 int chacha20_einit(void *vctx, const unsigned char *key, size_t keylen,
140 const unsigned char *iv, size_t ivlen)
144 ret= cipher_generic_einit(vctx, key, keylen, iv, ivlen);
145 if (ret && iv != NULL) {
146 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
147 PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw;
154 int chacha20_dinit(void *vctx, const unsigned char *key, size_t keylen,
155 const unsigned char *iv, size_t ivlen)
159 ret= cipher_generic_dinit(vctx, key, keylen, iv, ivlen);
160 if (ret && iv != NULL) {
161 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
162 PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw;
169 /* chacha20_functions */
170 const OSSL_DISPATCH chacha20_functions[] = {
171 { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_newctx },
172 { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_freectx },
173 { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))chacha20_einit },
174 { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))chacha20_dinit },
175 { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_update },
176 { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_final },
177 { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_cipher},
178 { OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void))chacha20_get_params },
179 { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,(void (*)(void))chacha20_gettable_params },
180 { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))chacha20_get_ctx_params },
181 { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
182 (void (*)(void))chacha20_gettable_ctx_params },
183 { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, (void (*)(void))chacha20_set_ctx_params },
184 { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
185 (void (*)(void))chacha20_settable_ctx_params },