providers/implementations/ciphers/cipher_chacha20.c

   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 /* Dispatch functions for chacha20 cipher */
  11
  12 #include <openssl/proverr.h>
  13 #include "cipher_chacha20.h"
  14 #include "prov/implementations.h"
  15 #include "prov/providercommon.h"
  16
  17 #define CHACHA20_KEYLEN (CHACHA_KEY_SIZE)
  18 #define CHACHA20_BLKLEN (1)
  19 #define CHACHA20_IVLEN (CHACHA_CTR_SIZE)
  20 #define CHACHA20_FLAGS (PROV_CIPHER_FLAG_CUSTOM_IV)
  21
  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 ossl_cipher_generic_cipher
  30 #define chacha20_update ossl_cipher_generic_stream_update
  31 #define chacha20_final ossl_cipher_generic_stream_final
  32 #define chacha20_gettable_params ossl_cipher_generic_gettable_params
  33
  34 void ossl_chacha20_initctx(PROV_CHACHA20_CTX *ctx)
  35 {
  36     ossl_cipher_generic_initkey(ctx, CHACHA20_KEYLEN * 8,
  37                                 CHACHA20_BLKLEN * 8,
  38                                 CHACHA20_IVLEN * 8,
  39                                 0, CHACHA20_FLAGS,
  40                                 ossl_prov_cipher_hw_chacha20(CHACHA20_KEYLEN * 8),
  41                                 NULL);
  42 }
  43
  44 static void *chacha20_newctx(void *provctx)
  45 {
  46     PROV_CHACHA20_CTX *ctx;
  47
  48     if (!ossl_prov_is_running())
  49         return NULL;
  50
  51     ctx = OPENSSL_zalloc(sizeof(*ctx));
  52     if (ctx != NULL)
  53         ossl_chacha20_initctx(ctx);
  54     return ctx;
  55 }
  56
  57 static void chacha20_freectx(void *vctx)
  58 {
  59     PROV_CHACHA20_CTX *ctx = (PROV_CHACHA20_CTX *)vctx;
  60
  61     if (ctx != NULL) {
  62         ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
  63         OPENSSL_clear_free(ctx, sizeof(*ctx));
  64     }
  65 }
  66
  67 static int chacha20_get_params(OSSL_PARAM params[])
  68 {
  69     return ossl_cipher_generic_get_params(params, 0, CHACHA20_FLAGS,
  70                                           CHACHA20_KEYLEN * 8,
  71                                           CHACHA20_BLKLEN * 8,
  72                                           CHACHA20_IVLEN * 8);
  73 }
  74
  75 static int chacha20_get_ctx_params(void *vctx, OSSL_PARAM params[])
  76 {
  77     OSSL_PARAM *p;
  78
  79     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
  80     if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_IVLEN)) {
  81         ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
  82         return 0;
  83     }
  84     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
  85     if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_KEYLEN)) {
  86         ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
  87         return 0;
  88     }
  89
  90     return 1;
  91 }
  92
  93 static const OSSL_PARAM chacha20_known_gettable_ctx_params[] = {
  94     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
  95     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
  96     OSSL_PARAM_END
  97 };
  98 const OSSL_PARAM *chacha20_gettable_ctx_params(ossl_unused void *provctx)
  99 {
 100     return chacha20_known_gettable_ctx_params;
 101 }
 102
 103 static int chacha20_set_ctx_params(void *vctx, const OSSL_PARAM params[])
 104 {
 105     const OSSL_PARAM *p;
 106     size_t len;
 107
 108     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
 109     if (p != NULL) {
 110         if (!OSSL_PARAM_get_size_t(p, &len)) {
 111             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
 112             return 0;
 113         }
 114         if (len != CHACHA20_KEYLEN) {
 115             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
 116             return 0;
 117         }
 118     }
 119     p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN);
 120     if (p != NULL) {
 121         if (!OSSL_PARAM_get_size_t(p, &len)) {
 122             ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
 123             return 0;
 124         }
 125         if (len != CHACHA20_IVLEN) {
 126             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
 127             return 0;
 128         }
 129     }
 130     return 1;
 131 }
 132
 133 static const OSSL_PARAM chacha20_known_settable_ctx_params[] = {
 134     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
 135     OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
 136     OSSL_PARAM_END
 137 };
 138 const OSSL_PARAM *chacha20_settable_ctx_params(ossl_unused void *provctx)
 139 {
 140     return chacha20_known_settable_ctx_params;
 141 }
 142
 143 int ossl_chacha20_einit(void *vctx, const unsigned char *key, size_t keylen,
 144                         const unsigned char *iv, size_t ivlen)
 145 {
 146     int ret;
 147
 148     /* The generic function checks for ossl_prov_is_running() */
 149     ret= ossl_cipher_generic_einit(vctx, key, keylen, iv, ivlen);
 150     if (ret && iv != NULL) {
 151         PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
 152         PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw;
 153
 154         hw->initiv(ctx);
 155     }
 156     return ret;
 157 }
 158
 159 int ossl_chacha20_dinit(void *vctx, const unsigned char *key, size_t keylen,
 160                         const unsigned char *iv, size_t ivlen)
 161 {
 162     int ret;
 163
 164     /* The generic function checks for ossl_prov_is_running() */
 165     ret= ossl_cipher_generic_dinit(vctx, key, keylen, iv, ivlen);
 166     if (ret && iv != NULL) {
 167         PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
 168         PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw;
 169
 170         hw->initiv(ctx);
 171     }
 172     return ret;
 173 }
 174
 175 /* ossl_chacha20_functions */
 176 const OSSL_DISPATCH ossl_chacha20_functions[] = {
 177     { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_newctx },
 178     { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_freectx },
 179     { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))ossl_chacha20_einit },
 180     { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))ossl_chacha20_dinit },
 181     { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_update },
 182     { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_final },
 183     { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_cipher},
 184     { OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void))chacha20_get_params },
 185     { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,(void (*)(void))chacha20_gettable_params },
 186     { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))chacha20_get_ctx_params },
 187     { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
 188         (void (*)(void))chacha20_gettable_ctx_params },
 189     { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, (void (*)(void))chacha20_set_ctx_params },
 190     { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
 191         (void (*)(void))chacha20_settable_ctx_params },
 192     { 0, NULL }
 193 };
 194