[331] | 1 | /*
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| 2 | * Copyright 2010-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/x509.h>
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| 13 | #include <openssl/x509v3.h>
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| 14 | #include <openssl/evp.h>
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| 15 | #include <openssl/cmac.h>
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| 16 | #include "internal/evp_int.h"
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| 17 |
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| 18 | /* The context structure and "key" is simply a CMAC_CTX */
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| 19 |
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| 20 | static int pkey_cmac_init(EVP_PKEY_CTX *ctx)
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| 21 | {
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| 22 | ctx->data = CMAC_CTX_new();
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| 23 | if (ctx->data == NULL)
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| 24 | return 0;
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| 25 | ctx->keygen_info_count = 0;
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| 26 | return 1;
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| 27 | }
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| 28 |
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| 29 | static int pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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| 30 | {
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| 31 | if (!pkey_cmac_init(dst))
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| 32 | return 0;
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| 33 | if (!CMAC_CTX_copy(dst->data, src->data))
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| 34 | return 0;
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| 35 | return 1;
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| 36 | }
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| 37 |
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| 38 | static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
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| 39 | {
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| 40 | CMAC_CTX_free(ctx->data);
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| 41 | }
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| 42 |
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| 43 | static int pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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| 44 | {
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| 45 | CMAC_CTX *cmkey = CMAC_CTX_new();
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| 46 | CMAC_CTX *cmctx = ctx->data;
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| 47 | if (cmkey == NULL)
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| 48 | return 0;
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| 49 | if (!CMAC_CTX_copy(cmkey, cmctx)) {
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| 50 | CMAC_CTX_free(cmkey);
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| 51 | return 0;
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| 52 | }
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| 53 | EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
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| 54 |
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| 55 | return 1;
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| 56 | }
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| 57 |
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| 58 | static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
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| 59 | {
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| 60 | if (!CMAC_Update(EVP_MD_CTX_pkey_ctx(ctx)->data, data, count))
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| 61 | return 0;
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| 62 | return 1;
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| 63 | }
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| 64 |
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| 65 | static int cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
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| 66 | {
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| 67 | EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
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| 68 | EVP_MD_CTX_set_update_fn(mctx, int_update);
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| 69 | return 1;
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| 70 | }
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| 71 |
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| 72 | static int cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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| 73 | EVP_MD_CTX *mctx)
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| 74 | {
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| 75 | return CMAC_Final(ctx->data, sig, siglen);
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| 76 | }
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| 77 |
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| 78 | static int pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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| 79 | {
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| 80 | CMAC_CTX *cmctx = ctx->data;
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| 81 | switch (type) {
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| 82 |
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| 83 | case EVP_PKEY_CTRL_SET_MAC_KEY:
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| 84 | if (!p2 || p1 < 0)
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| 85 | return 0;
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| 86 | if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
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| 87 | return 0;
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| 88 | break;
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| 89 |
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| 90 | case EVP_PKEY_CTRL_CIPHER:
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| 91 | if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
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| 92 | return 0;
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| 93 | break;
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| 94 |
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| 95 | case EVP_PKEY_CTRL_MD:
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| 96 | if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
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| 97 | (CMAC_CTX *)ctx->pkey->pkey.ptr))
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| 98 | return 0;
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| 99 | if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
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| 100 | return 0;
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| 101 | break;
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| 102 |
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| 103 | default:
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| 104 | return -2;
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| 105 |
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| 106 | }
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| 107 | return 1;
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| 108 | }
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| 109 |
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| 110 | static int pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx,
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| 111 | const char *type, const char *value)
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| 112 | {
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| 113 | if (!value) {
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| 114 | return 0;
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| 115 | }
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| 116 | if (strcmp(type, "cipher") == 0) {
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| 117 | const EVP_CIPHER *c;
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| 118 | c = EVP_get_cipherbyname(value);
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| 119 | if (!c)
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| 120 | return 0;
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| 121 | return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
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| 122 | }
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| 123 | if (strcmp(type, "key") == 0)
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| 124 | return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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| 125 | if (strcmp(type, "hexkey") == 0)
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| 126 | return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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| 127 | return -2;
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| 128 | }
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| 129 |
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| 130 | const EVP_PKEY_METHOD cmac_pkey_meth = {
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| 131 | EVP_PKEY_CMAC,
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| 132 | EVP_PKEY_FLAG_SIGCTX_CUSTOM,
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| 133 | pkey_cmac_init,
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| 134 | pkey_cmac_copy,
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| 135 | pkey_cmac_cleanup,
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| 136 |
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| 137 | 0, 0,
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| 138 |
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| 139 | 0,
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| 140 | pkey_cmac_keygen,
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| 141 |
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| 142 | 0, 0,
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| 143 |
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| 144 | 0, 0,
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| 145 |
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| 146 | 0, 0,
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| 147 |
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| 148 | cmac_signctx_init,
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| 149 | cmac_signctx,
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| 150 |
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| 151 | 0, 0,
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| 152 |
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| 153 | 0, 0,
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| 154 |
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| 155 | 0, 0,
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| 156 |
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| 157 | 0, 0,
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| 158 |
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| 159 | pkey_cmac_ctrl,
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| 160 | pkey_cmac_ctrl_str
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| 161 | };
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