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