[331] | 1 | /*
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| 2 | * Copyright 2007-2016 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/hmac.h>
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| 16 | #include "internal/evp_int.h"
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| 17 |
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| 18 | /* HMAC pkey context structure */
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| 19 |
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| 20 | typedef struct {
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| 21 | const EVP_MD *md; /* MD for HMAC use */
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| 22 | ASN1_OCTET_STRING ktmp; /* Temp storage for key */
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| 23 | HMAC_CTX *ctx;
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| 24 | } HMAC_PKEY_CTX;
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| 25 |
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| 26 | static int pkey_hmac_init(EVP_PKEY_CTX *ctx)
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| 27 | {
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| 28 | HMAC_PKEY_CTX *hctx;
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| 29 |
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| 30 | hctx = OPENSSL_zalloc(sizeof(*hctx));
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| 31 | if (hctx == NULL)
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| 32 | return 0;
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| 33 | hctx->ktmp.type = V_ASN1_OCTET_STRING;
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| 34 | hctx->ctx = HMAC_CTX_new();
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| 35 | if (hctx->ctx == NULL) {
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| 36 | OPENSSL_free(hctx);
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| 37 | return 0;
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| 38 | }
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| 39 |
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| 40 | ctx->data = hctx;
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| 41 | ctx->keygen_info_count = 0;
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| 42 |
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| 43 | return 1;
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| 44 | }
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| 45 |
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| 46 | static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx);
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| 47 |
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| 48 | static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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| 49 | {
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| 50 | HMAC_PKEY_CTX *sctx, *dctx;
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| 51 |
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| 52 | /* allocate memory for dst->data and a new HMAC_CTX in dst->data->ctx */
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| 53 | if (!pkey_hmac_init(dst))
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| 54 | return 0;
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| 55 | sctx = EVP_PKEY_CTX_get_data(src);
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| 56 | dctx = EVP_PKEY_CTX_get_data(dst);
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| 57 | dctx->md = sctx->md;
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| 58 | if (!HMAC_CTX_copy(dctx->ctx, sctx->ctx))
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| 59 | goto err;
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| 60 | if (sctx->ktmp.data) {
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| 61 | if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
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| 62 | sctx->ktmp.data, sctx->ktmp.length))
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| 63 | goto err;
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| 64 | }
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| 65 | return 1;
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| 66 | err:
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| 67 | /* release HMAC_CTX in dst->data->ctx and memory allocated for dst->data */
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| 68 | pkey_hmac_cleanup (dst);
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| 69 | return 0;
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| 70 | }
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| 71 |
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| 72 | static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
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| 73 | {
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| 74 | HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
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| 75 |
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| 76 | if (hctx != NULL) {
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| 77 | HMAC_CTX_free(hctx->ctx);
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| 78 | OPENSSL_clear_free(hctx->ktmp.data, hctx->ktmp.length);
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| 79 | OPENSSL_free(hctx);
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| 80 | EVP_PKEY_CTX_set_data(ctx, NULL);
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| 81 | }
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| 82 | }
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| 83 |
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| 84 | static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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| 85 | {
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| 86 | ASN1_OCTET_STRING *hkey = NULL;
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| 87 | HMAC_PKEY_CTX *hctx = ctx->data;
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| 88 | if (!hctx->ktmp.data)
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| 89 | return 0;
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| 90 | hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
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| 91 | if (!hkey)
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| 92 | return 0;
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| 93 | EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
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| 94 |
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| 95 | return 1;
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| 96 | }
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| 97 |
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| 98 | static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
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| 99 | {
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| 100 | HMAC_PKEY_CTX *hctx = EVP_MD_CTX_pkey_ctx(ctx)->data;
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| 101 | if (!HMAC_Update(hctx->ctx, data, count))
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| 102 | return 0;
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| 103 | return 1;
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| 104 | }
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| 105 |
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| 106 | static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
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| 107 | {
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| 108 | HMAC_PKEY_CTX *hctx = ctx->data;
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| 109 | HMAC_CTX_set_flags(hctx->ctx,
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| 110 | EVP_MD_CTX_test_flags(mctx, ~EVP_MD_CTX_FLAG_NO_INIT));
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| 111 | EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
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| 112 | EVP_MD_CTX_set_update_fn(mctx, int_update);
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| 113 | return 1;
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| 114 | }
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| 115 |
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| 116 | static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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| 117 | EVP_MD_CTX *mctx)
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| 118 | {
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| 119 | unsigned int hlen;
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| 120 | HMAC_PKEY_CTX *hctx = ctx->data;
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| 121 | int l = EVP_MD_CTX_size(mctx);
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| 122 |
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| 123 | if (l < 0)
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| 124 | return 0;
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| 125 | *siglen = l;
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| 126 | if (!sig)
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| 127 | return 1;
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| 128 |
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| 129 | if (!HMAC_Final(hctx->ctx, sig, &hlen))
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| 130 | return 0;
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| 131 | *siglen = (size_t)hlen;
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| 132 | return 1;
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| 133 | }
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| 134 |
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| 135 | static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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| 136 | {
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| 137 | HMAC_PKEY_CTX *hctx = ctx->data;
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| 138 | ASN1_OCTET_STRING *key;
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| 139 | switch (type) {
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| 140 |
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| 141 | case EVP_PKEY_CTRL_SET_MAC_KEY:
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| 142 | if ((!p2 && p1 > 0) || (p1 < -1))
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| 143 | return 0;
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| 144 | if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
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| 145 | return 0;
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| 146 | break;
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| 147 |
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| 148 | case EVP_PKEY_CTRL_MD:
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| 149 | hctx->md = p2;
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| 150 | break;
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| 151 |
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| 152 | case EVP_PKEY_CTRL_DIGESTINIT:
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| 153 | key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
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| 154 | if (!HMAC_Init_ex(hctx->ctx, key->data, key->length, hctx->md,
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| 155 | ctx->engine))
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| 156 | return 0;
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| 157 | break;
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| 158 |
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| 159 | default:
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| 160 | return -2;
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| 161 |
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| 162 | }
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| 163 | return 1;
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| 164 | }
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| 165 |
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| 166 | static int pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
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| 167 | const char *type, const char *value)
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| 168 | {
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| 169 | if (!value) {
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| 170 | return 0;
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| 171 | }
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| 172 | if (strcmp(type, "key") == 0)
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| 173 | return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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| 174 | if (strcmp(type, "hexkey") == 0)
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| 175 | return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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| 176 | return -2;
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| 177 | }
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| 178 |
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| 179 | const EVP_PKEY_METHOD hmac_pkey_meth = {
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| 180 | EVP_PKEY_HMAC,
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| 181 | 0,
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| 182 | pkey_hmac_init,
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| 183 | pkey_hmac_copy,
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| 184 | pkey_hmac_cleanup,
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| 185 |
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| 186 | 0, 0,
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| 187 |
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| 188 | 0,
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| 189 | pkey_hmac_keygen,
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| 190 |
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| 191 | 0, 0,
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| 192 |
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| 193 | 0, 0,
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| 194 |
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| 195 | 0, 0,
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| 196 |
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| 197 | hmac_signctx_init,
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| 198 | hmac_signctx,
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| 199 |
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| 200 | 0, 0,
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| 201 |
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| 202 | 0, 0,
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| 203 |
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| 204 | 0, 0,
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| 205 |
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| 206 | 0, 0,
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| 207 |
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| 208 | pkey_hmac_ctrl,
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| 209 | pkey_hmac_ctrl_str
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| 210 | };
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