include/rsa.h

   1 /*
   2  * Copyright (c) 2013, Google Inc.
   3  *
   4  * (C) Copyright 2008 Semihalf
   5  *
   6  * (C) Copyright 2000-2006
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  */
  27
  28 #ifndef _RSA_H
  29 #define _RSA_H
  30
  31 #include <errno.h>
  32 #include <image.h>
  33
  34 #if IMAGE_ENABLE_SIGN
  35 /**
  36  * sign() - calculate and return signature for given input data
  37  *
  38  * @info:       Specifies key and FIT information
  39  * @data:       Pointer to the input data
  40  * @data_len:   Data length
  41  * @sigp:       Set to an allocated buffer holding the signature
  42  * @sig_len:    Set to length of the calculated hash
  43  *
  44  * This computes input data signature according to selected algorithm.
  45  * Resulting signature value is placed in an allocated buffer, the
  46  * pointer is returned as *sigp. The length of the calculated
  47  * signature is returned via the sig_len pointer argument. The caller
  48  * should free *sigp.
  49  *
  50  * @return: 0, on success, -ve on error
  51  */
  52 int rsa_sign(struct image_sign_info *info,
  53              const struct image_region region[],
  54              int region_count, uint8_t **sigp, uint *sig_len);
  55
  56 /**
  57  * add_verify_data() - Add verification information to FDT
  58  *
  59  * Add public key information to the FDT node, suitable for
  60  * verification at run-time. The information added depends on the
  61  * algorithm being used.
  62  *
  63  * @info:       Specifies key and FIT information
  64  * @keydest:    Destination FDT blob for public key data
  65  * @return: 0, on success, -ve on error
  66 */
  67 int rsa_add_verify_data(struct image_sign_info *info, void *keydest);
  68 #else
  69 static inline int rsa_sign(struct image_sign_info *info,
  70                 const struct image_region region[], int region_count,
  71                 uint8_t **sigp, uint *sig_len)
  72 {
  73         return -ENXIO;
  74 }
  75
  76 static inline int rsa_add_verify_data(struct image_sign_info *info,
  77                                       void *keydest)
  78 {
  79         return -ENXIO;
  80 }
  81 #endif
  82
  83 #if IMAGE_ENABLE_VERIFY
  84 /**
  85  * rsa_verify() - Verify a signature against some data
  86  *
  87  * Verify a RSA PKCS1.5 signature against an expected hash.
  88  *
  89  * @info:       Specifies key and FIT information
  90  * @data:       Pointer to the input data
  91  * @data_len:   Data length
  92  * @sig:        Signature
  93  * @sig_len:    Number of bytes in signature
  94  * @return 0 if verified, -ve on error
  95  */
  96 int rsa_verify(struct image_sign_info *info,
  97                const struct image_region region[], int region_count,
  98                uint8_t *sig, uint sig_len);
  99 #else
 100 static inline int rsa_verify(struct image_sign_info *info,
 101                 const struct image_region region[], int region_count,
 102                 uint8_t *sig, uint sig_len)
 103 {
 104         return -ENXIO;
 105 }
 106 #endif
 107
 108 #endif