diff options
Diffstat (limited to 'providers/implementations/ciphers/cipher_chacha20.c')
| -rw-r--r-- | providers/implementations/ciphers/cipher_chacha20.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/providers/implementations/ciphers/cipher_chacha20.c b/providers/implementations/ciphers/cipher_chacha20.c new file mode 100644 index 0000000000..7cc57e7043 --- /dev/null +++ b/providers/implementations/ciphers/cipher_chacha20.c @@ -0,0 +1,187 @@ +/* + * Copyright 2019 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 + */ + +/* Dispatch functions for chacha20 cipher */ + +#include "cipher_chacha20.h" +#include "prov/implementations.h" +#include "prov/providercommonerr.h" + +#define CHACHA20_KEYLEN (CHACHA_KEY_SIZE) +#define CHACHA20_BLKLEN (1) +#define CHACHA20_IVLEN (CHACHA_CTR_SIZE) +/* TODO(3.0) Figure out what flags are required */ +#define CHACHA20_FLAGS (EVP_CIPH_CUSTOM_IV | EVP_CIPH_ALWAYS_CALL_INIT) + +static OSSL_OP_cipher_newctx_fn chacha20_newctx; +static OSSL_OP_cipher_freectx_fn chacha20_freectx; +static OSSL_OP_cipher_get_params_fn chacha20_get_params; +static OSSL_OP_cipher_get_ctx_params_fn chacha20_get_ctx_params; +static OSSL_OP_cipher_set_ctx_params_fn chacha20_set_ctx_params; +static OSSL_OP_cipher_gettable_ctx_params_fn chacha20_gettable_ctx_params; +static OSSL_OP_cipher_settable_ctx_params_fn chacha20_settable_ctx_params; +#define chacha20_cipher cipher_generic_cipher +#define chacha20_update cipher_generic_stream_update +#define chacha20_final cipher_generic_stream_final +#define chacha20_gettable_params cipher_generic_gettable_params + +void chacha20_initctx(PROV_CHACHA20_CTX *ctx) +{ + cipher_generic_initkey(ctx, CHACHA20_KEYLEN * 8, + CHACHA20_BLKLEN * 8, + CHACHA20_IVLEN * 8, + 0, CHACHA20_FLAGS, + PROV_CIPHER_HW_chacha20(CHACHA20_KEYLEN * 8), + NULL); +} + +static void *chacha20_newctx(void *provctx) +{ + PROV_CHACHA20_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); + + if (ctx != NULL) + chacha20_initctx(ctx); + return ctx; +} + +static void chacha20_freectx(void *vctx) +{ + PROV_CHACHA20_CTX *ctx = (PROV_CHACHA20_CTX *)vctx; + + if (ctx != NULL) { + OPENSSL_clear_free(ctx, sizeof(ctx)); + } +} + +static int chacha20_get_params(OSSL_PARAM params[]) +{ + return cipher_generic_get_params(params, 0, CHACHA20_FLAGS, + CHACHA20_KEYLEN * 8, + CHACHA20_BLKLEN * 8, + CHACHA20_IVLEN * 8); +} + +static int chacha20_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, CHACHA20_IVLEN)) { + 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, CHACHA20_KEYLEN)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); + return 0; + } + + return 1; +} + +static const OSSL_PARAM chacha20_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 +}; +const OSSL_PARAM *chacha20_gettable_ctx_params(void) +{ + return chacha20_known_gettable_ctx_params; +} + +static int chacha20_set_ctx_params(void *vctx, const OSSL_PARAM params[]) +{ + const OSSL_PARAM *p; + size_t len; + + p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN); + if (p != NULL) { + if (!OSSL_PARAM_get_size_t(p, &len)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); + return 0; + } + if (len != CHACHA20_KEYLEN) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH); + return 0; + } + } + p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN); + if (p != NULL) { + if (!OSSL_PARAM_get_size_t(p, &len)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); + return 0; + } + if (len != CHACHA20_IVLEN) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH); + return 0; + } + } + return 1; +} + +static const OSSL_PARAM chacha20_known_settable_ctx_params[] = { + OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), + OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL), + OSSL_PARAM_END +}; +const OSSL_PARAM *chacha20_settable_ctx_params(void) +{ + return chacha20_known_settable_ctx_params; +} + +int chacha20_einit(void *vctx, const unsigned char *key, size_t keylen, + const unsigned char *iv, size_t ivlen) +{ + int ret; + + ret= cipher_generic_einit(vctx, key, keylen, iv, ivlen); + if (ret && iv != NULL) { + PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; + PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw; + + hw->initiv(ctx); + } + return ret; +} + +int chacha20_dinit(void *vctx, const unsigned char *key, size_t keylen, + const unsigned char *iv, size_t ivlen) +{ + int ret; + + ret= cipher_generic_dinit(vctx, key, keylen, iv, ivlen); + if (ret && iv != NULL) { + PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; + PROV_CIPHER_HW_CHACHA20 *hw = (PROV_CIPHER_HW_CHACHA20 *)ctx->hw; + + hw->initiv(ctx); + } + return ret; +} + +/* chacha20_functions */ +const OSSL_DISPATCH chacha20_functions[] = { + { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_newctx }, + { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_freectx }, + { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))chacha20_einit }, + { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))chacha20_dinit }, + { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_update }, + { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_final }, + { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_cipher}, + { OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void))chacha20_get_params }, + { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,(void (*)(void))chacha20_gettable_params }, + { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))chacha20_get_ctx_params }, + { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, + (void (*)(void))chacha20_gettable_ctx_params }, + { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, (void (*)(void))chacha20_set_ctx_params }, + { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, + (void (*)(void))chacha20_settable_ctx_params }, + { 0, NULL } +}; + |