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_poly1305 cipher */
12 #include "cipher_chacha20_poly1305.h"
13 #include "prov/implementations.h"
14 #include "prov/providercommon.h"
15 #include "prov/providercommonerr.h"
18 #define CHACHA20_POLY1305_KEYLEN CHACHA_KEY_SIZE
19 #define CHACHA20_POLY1305_BLKLEN 1
20 #define CHACHA20_POLY1305_MAX_IVLEN 12
21 #define CHACHA20_POLY1305_MODE 0
22 /* TODO(3.0) Figure out what flags are required */
23 #define CHACHA20_POLY1305_FLAGS (EVP_CIPH_FLAG_AEAD_CIPHER \
24 | EVP_CIPH_ALWAYS_CALL_INIT \
25 | EVP_CIPH_CTRL_INIT \
26 | EVP_CIPH_CUSTOM_COPY \
27 | EVP_CIPH_FLAG_CUSTOM_CIPHER \
28 | EVP_CIPH_CUSTOM_IV \
29 | EVP_CIPH_CUSTOM_IV_LENGTH)
31 static OSSL_FUNC_cipher_newctx_fn chacha20_poly1305_newctx;
32 static OSSL_FUNC_cipher_freectx_fn chacha20_poly1305_freectx;
33 static OSSL_FUNC_cipher_encrypt_init_fn chacha20_poly1305_einit;
34 static OSSL_FUNC_cipher_decrypt_init_fn chacha20_poly1305_dinit;
35 static OSSL_FUNC_cipher_get_params_fn chacha20_poly1305_get_params;
36 static OSSL_FUNC_cipher_get_ctx_params_fn chacha20_poly1305_get_ctx_params;
37 static OSSL_FUNC_cipher_set_ctx_params_fn chacha20_poly1305_set_ctx_params;
38 static OSSL_FUNC_cipher_cipher_fn chacha20_poly1305_cipher;
39 static OSSL_FUNC_cipher_final_fn chacha20_poly1305_final;
40 static OSSL_FUNC_cipher_gettable_ctx_params_fn chacha20_poly1305_gettable_ctx_params;
41 #define chacha20_poly1305_settable_ctx_params cipher_aead_settable_ctx_params
42 #define chacha20_poly1305_gettable_params cipher_generic_gettable_params
43 #define chacha20_poly1305_update chacha20_poly1305_cipher
45 static void *chacha20_poly1305_newctx(void *provctx)
47 PROV_CHACHA20_POLY1305_CTX *ctx;
49 if (!ossl_prov_is_running())
52 ctx = OPENSSL_zalloc(sizeof(*ctx));
54 cipher_generic_initkey(&ctx->base, CHACHA20_POLY1305_KEYLEN * 8,
55 CHACHA20_POLY1305_BLKLEN * 8,
56 CHACHA20_POLY1305_IVLEN * 8,
57 CHACHA20_POLY1305_MODE,
58 CHACHA20_POLY1305_FLAGS,
59 PROV_CIPHER_HW_chacha20_poly1305(
60 CHACHA20_POLY1305_KEYLEN * 8),
62 ctx->nonce_len = CHACHA20_POLY1305_IVLEN;
63 ctx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH;
64 chacha20_initctx(&ctx->chacha);
69 static void chacha20_poly1305_freectx(void *vctx)
71 PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
74 cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
75 OPENSSL_clear_free(ctx, sizeof(*ctx));
79 static int chacha20_poly1305_get_params(OSSL_PARAM params[])
81 return cipher_generic_get_params(params, 0, CHACHA20_POLY1305_FLAGS,
82 CHACHA20_POLY1305_KEYLEN * 8,
83 CHACHA20_POLY1305_BLKLEN * 8,
84 CHACHA20_POLY1305_IVLEN * 8);
87 static int chacha20_poly1305_get_ctx_params(void *vctx, OSSL_PARAM params[])
89 PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
92 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
94 if (!OSSL_PARAM_set_size_t(p, ctx->nonce_len)) {
95 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
99 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
100 if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_POLY1305_KEYLEN)) {
101 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
104 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAGLEN);
105 if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tag_len)) {
106 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
109 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD);
110 if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tls_aad_pad_sz)) {
111 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
115 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG);
117 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
118 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
121 if (!ctx->base.enc) {
122 ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOTSET);
125 if (p->data_size == 0 || p->data_size > POLY1305_BLOCK_SIZE) {
126 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAGLEN);
129 memcpy(p->data, ctx->tag, p->data_size);
135 static const OSSL_PARAM chacha20_poly1305_known_gettable_ctx_params[] = {
136 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
137 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
138 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TAGLEN, NULL),
139 OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0),
140 OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, NULL),
143 static const OSSL_PARAM *chacha20_poly1305_gettable_ctx_params
144 (ossl_unused void *provctx)
146 return chacha20_poly1305_known_gettable_ctx_params;
149 static int chacha20_poly1305_set_ctx_params(void *vctx,
150 const OSSL_PARAM params[])
154 PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
155 PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
156 (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->base.hw;
158 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
160 if (!OSSL_PARAM_get_size_t(p, &len)) {
161 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
164 if (len != CHACHA20_POLY1305_KEYLEN) {
165 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
169 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN);
171 if (!OSSL_PARAM_get_size_t(p, &len)) {
172 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
175 if (len == 0 || len > CHACHA20_POLY1305_MAX_IVLEN) {
176 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
179 ctx->nonce_len = len;
182 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG);
184 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
185 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
188 if (p->data_size == 0 || p->data_size > POLY1305_BLOCK_SIZE) {
189 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAGLEN);
192 if (p->data != NULL) {
194 ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
197 memcpy(ctx->tag, p->data, p->data_size);
199 ctx->tag_len = p->data_size;
202 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD);
204 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
205 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
208 len = hw->tls_init(&ctx->base, p->data, p->data_size);
210 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA);
213 ctx->tls_aad_pad_sz = len;
216 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED);
218 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
219 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
222 if (hw->tls_iv_set_fixed(&ctx->base, p->data, p->data_size) == 0) {
223 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
227 /* ignore OSSL_CIPHER_PARAM_AEAD_MAC_KEY */
231 static int chacha20_poly1305_einit(void *vctx, const unsigned char *key,
232 size_t keylen, const unsigned char *iv,
237 /* The generic function checks for ossl_prov_is_running() */
238 ret = cipher_generic_einit(vctx, key, keylen, iv, ivlen);
239 if (ret && iv != NULL) {
240 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
241 PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
242 (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
249 static int chacha20_poly1305_dinit(void *vctx, const unsigned char *key,
250 size_t keylen, const unsigned char *iv,
255 /* The generic function checks for ossl_prov_is_running() */
256 ret = cipher_generic_dinit(vctx, key, keylen, iv, ivlen);
257 if (ret && iv != NULL) {
258 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
259 PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
260 (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
267 static int chacha20_poly1305_cipher(void *vctx, unsigned char *out,
268 size_t *outl, size_t outsize,
269 const unsigned char *in, size_t inl)
271 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
272 PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
273 (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
275 if (!ossl_prov_is_running())
284 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
288 if (!hw->aead_cipher(ctx, out, outl, in, inl))
294 static int chacha20_poly1305_final(void *vctx, unsigned char *out, size_t *outl,
297 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
298 PROV_CIPHER_HW_CHACHA20_POLY1305 *hw =
299 (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;
301 if (!ossl_prov_is_running())
304 if (hw->aead_cipher(ctx, out, outl, NULL, 0) <= 0)
311 /* chacha20_poly1305_functions */
312 const OSSL_DISPATCH chacha20_poly1305_functions[] = {
313 { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_poly1305_newctx },
314 { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_poly1305_freectx },
315 { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))chacha20_poly1305_einit },
316 { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))chacha20_poly1305_dinit },
317 { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_poly1305_update },
318 { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_poly1305_final },
319 { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_poly1305_cipher },
320 { OSSL_FUNC_CIPHER_GET_PARAMS,
321 (void (*)(void))chacha20_poly1305_get_params },
322 { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,
323 (void (*)(void))chacha20_poly1305_gettable_params },
324 { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,
325 (void (*)(void))chacha20_poly1305_get_ctx_params },
326 { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
327 (void (*)(void))chacha20_poly1305_gettable_ctx_params },
328 { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,
329 (void (*)(void))chacha20_poly1305_set_ctx_params },
330 { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
331 (void (*)(void))chacha20_poly1305_settable_ctx_params },