1/*
2 * Copyright 2018 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#include <openssl/core_numbers.h>
11#include <openssl/core_names.h>
12#include <openssl/params.h>
13#include <openssl/evp.h>
14#include <openssl/err.h>
15
16#include "crypto/poly1305.h"
17
18#include "prov/providercommonerr.h"
19#include "prov/implementations.h"
20
21/*
22 * Forward declaration of everything implemented here. This is not strictly
23 * necessary for the compiler, but provides an assurance that the signatures
24 * of the functions in the dispatch table are correct.
25 */
26static OSSL_OP_mac_newctx_fn poly1305_new;
27static OSSL_OP_mac_dupctx_fn poly1305_dup;
28static OSSL_OP_mac_freectx_fn poly1305_free;
29static OSSL_OP_mac_gettable_params_fn poly1305_gettable_params;
30static OSSL_OP_mac_get_params_fn poly1305_get_params;
31static OSSL_OP_mac_settable_ctx_params_fn poly1305_settable_ctx_params;
32static OSSL_OP_mac_set_ctx_params_fn poly1305_set_ctx_params;
33static OSSL_OP_mac_init_fn poly1305_init;
34static OSSL_OP_mac_update_fn poly1305_update;
35static OSSL_OP_mac_final_fn poly1305_final;
36
37struct poly1305_data_st {
38 void *provctx;
39 POLY1305 poly1305; /* Poly1305 data */
40};
41
42static size_t poly1305_size(void);
43
44static void *poly1305_new(void *provctx)
45{
46 struct poly1305_data_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
47
48 if (ctx != NULL)
49 ctx->provctx = provctx;
50 return ctx;
51}
52
53static void poly1305_free(void *vmacctx)
54{
55 OPENSSL_free(vmacctx);
56}
57
58static void *poly1305_dup(void *vsrc)
59{
60 struct poly1305_data_st *src = vsrc;
61 struct poly1305_data_st *dst = poly1305_new(src->provctx);
62
63 if (dst == NULL)
64 return NULL;
65
66 dst->poly1305 = src->poly1305;
67 return dst;
68}
69
70static size_t poly1305_size(void)
71{
72 return POLY1305_DIGEST_SIZE;
73}
74
75static int poly1305_init(void *vmacctx)
76{
77 /* initialize the context in MAC_ctrl function */
78 return 1;
79}
80
81static int poly1305_update(void *vmacctx, const unsigned char *data,
82 size_t datalen)
83{
84 struct poly1305_data_st *ctx = vmacctx;
85
86 /* poly1305 has nothing to return in its update function */
87 Poly1305_Update(&ctx->poly1305, data, datalen);
88 return 1;
89}
90
91static int poly1305_final(void *vmacctx, unsigned char *out, size_t *outl,
92 size_t outsize)
93{
94 struct poly1305_data_st *ctx = vmacctx;
95
96 Poly1305_Final(&ctx->poly1305, out);
97 return 1;
98}
99
100static const OSSL_PARAM known_gettable_params[] = {
101 OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
102 OSSL_PARAM_END
103};
104static const OSSL_PARAM *poly1305_gettable_params(void)
105{
106 return known_gettable_params;
107}
108
109static int poly1305_get_params(OSSL_PARAM params[])
110{
111 OSSL_PARAM *p;
112
113 if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
114 return OSSL_PARAM_set_size_t(p, poly1305_size());
115
116 return 1;
117}
118
119static const OSSL_PARAM known_settable_ctx_params[] = {
120 OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
121 OSSL_PARAM_END
122};
123static const OSSL_PARAM *poly1305_settable_ctx_params(void)
124{
125 return known_settable_ctx_params;
126}
127
128static int poly1305_set_ctx_params(void *vmacctx, const OSSL_PARAM *params)
129{
130 struct poly1305_data_st *ctx = vmacctx;
131 const OSSL_PARAM *p = NULL;
132
133 if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
134 if (p->data_type != OSSL_PARAM_OCTET_STRING
135 || p->data_size != POLY1305_KEY_SIZE) {
136 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
137 return 0;
138 }
139 Poly1305_Init(&ctx->poly1305, p->data);
140 }
141 return 1;
142}
143
144const OSSL_DISPATCH poly1305_functions[] = {
145 { OSSL_FUNC_MAC_NEWCTX, (void (*)(void))poly1305_new },
146 { OSSL_FUNC_MAC_DUPCTX, (void (*)(void))poly1305_dup },
147 { OSSL_FUNC_MAC_FREECTX, (void (*)(void))poly1305_free },
148 { OSSL_FUNC_MAC_INIT, (void (*)(void))poly1305_init },
149 { OSSL_FUNC_MAC_UPDATE, (void (*)(void))poly1305_update },
150 { OSSL_FUNC_MAC_FINAL, (void (*)(void))poly1305_final },
151 { OSSL_FUNC_MAC_GETTABLE_PARAMS, (void (*)(void))poly1305_gettable_params },
152 { OSSL_FUNC_MAC_GET_PARAMS, (void (*)(void))poly1305_get_params },
153 { OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
154 (void (*)(void))poly1305_settable_ctx_params },
155 { OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))poly1305_set_ctx_params },
156 { 0, NULL }
157};
158