crypto/pem/pem_sign.c

   1 /*
   2  * Copyright 1995-2016 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 <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/x509.h>
  15 #include <openssl/pem.h>
  16
  17 int PEM_SignInit(EVP_MD_CTX *ctx, EVP_MD *type)
  18 {
  19     return EVP_DigestInit_ex(ctx, type, NULL);
  20 }
  21
  22 int PEM_SignUpdate(EVP_MD_CTX *ctx, unsigned char *data, unsigned int count)
  23 {
  24     return EVP_DigestUpdate(ctx, data, count);
  25 }
  26
  27 int PEM_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
  28                   unsigned int *siglen, EVP_PKEY *pkey)
  29 {
  30     unsigned char *m;
  31     int i, ret = 0;
  32     unsigned int m_len;
  33
  34     m = OPENSSL_malloc(EVP_PKEY_size(pkey));
  35     if (m == NULL) {
  36         PEMerr(PEM_F_PEM_SIGNFINAL, ERR_R_MALLOC_FAILURE);
  37         goto err;
  38     }
  39
  40     if (EVP_SignFinal(ctx, m, &m_len, pkey) <= 0)
  41         goto err;
  42
  43     i = EVP_EncodeBlock(sigret, m, m_len);
  44     *siglen = i;
  45     ret = 1;
  46  err:
  47     /* ctx has been zeroed by EVP_SignFinal() */
  48     OPENSSL_free(m);
  49     return ret;
  50 }