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161 lines
3.6 KiB
C
161 lines
3.6 KiB
C
/*
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* Copyright 2010-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/evp.h>
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#include <openssl/cmac.h>
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#include "crypto/evp.h"
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/* The context structure and "key" is simply a CMAC_CTX */
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static int pkey_cmac_init(EVP_PKEY_CTX *ctx)
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{
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ctx->data = CMAC_CTX_new();
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if (ctx->data == NULL)
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return 0;
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ctx->keygen_info_count = 0;
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return 1;
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}
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static int pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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if (!pkey_cmac_init(dst))
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return 0;
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if (!CMAC_CTX_copy(dst->data, src->data))
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return 0;
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return 1;
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}
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static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
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{
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CMAC_CTX_free(ctx->data);
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}
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static int pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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CMAC_CTX *cmkey = CMAC_CTX_new();
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CMAC_CTX *cmctx = ctx->data;
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if (cmkey == NULL)
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return 0;
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if (!CMAC_CTX_copy(cmkey, cmctx)) {
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CMAC_CTX_free(cmkey);
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return 0;
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}
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EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
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return 1;
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}
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static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
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{
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if (!CMAC_Update(EVP_MD_CTX_pkey_ctx(ctx)->data, data, count))
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return 0;
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return 1;
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}
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static int cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
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{
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EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
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EVP_MD_CTX_set_update_fn(mctx, int_update);
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return 1;
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}
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static int cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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EVP_MD_CTX *mctx)
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{
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return CMAC_Final(ctx->data, sig, siglen);
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}
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static int pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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CMAC_CTX *cmctx = ctx->data;
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switch (type) {
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case EVP_PKEY_CTRL_SET_MAC_KEY:
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if (!p2 || p1 < 0)
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return 0;
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if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
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return 0;
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break;
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case EVP_PKEY_CTRL_CIPHER:
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if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
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return 0;
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break;
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case EVP_PKEY_CTRL_MD:
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if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
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(CMAC_CTX *)ctx->pkey->pkey.ptr))
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return 0;
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if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
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return 0;
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break;
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default:
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return -2;
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}
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return 1;
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}
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static int pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (!value) {
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return 0;
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}
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if (strcmp(type, "cipher") == 0) {
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const EVP_CIPHER *c;
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c = EVP_get_cipherbyname(value);
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if (!c)
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return 0;
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return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
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}
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if (strcmp(type, "key") == 0)
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return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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if (strcmp(type, "hexkey") == 0)
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return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
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return -2;
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}
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const EVP_PKEY_METHOD cmac_pkey_meth = {
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EVP_PKEY_CMAC,
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EVP_PKEY_FLAG_SIGCTX_CUSTOM,
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pkey_cmac_init,
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pkey_cmac_copy,
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pkey_cmac_cleanup,
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0, 0,
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0,
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pkey_cmac_keygen,
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0, 0,
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0, 0,
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0, 0,
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cmac_signctx_init,
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cmac_signctx,
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0, 0,
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0, 0,
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0, 0,
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0, 0,
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pkey_cmac_ctrl,
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pkey_cmac_ctrl_str
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};
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