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  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #ifndef _RSA_H
  13 #define _RSA_H
  14
  15 #include <errno.h>
  16 #include <image.h>
  17
  18 #if IMAGE_ENABLE_SIGN
  19 /**
  20  * sign() - calculate and return signature for given input data
  21  *
  22  * @info:       Specifies key and FIT information
  23  * @data:       Pointer to the input data
  24  * @data_len:   Data length
  25  * @sigp:       Set to an allocated buffer holding the signature
  26  * @sig_len:    Set to length of the calculated hash
  27  *
  28  * This computes input data signature according to selected algorithm.
  29  * Resulting signature value is placed in an allocated buffer, the
  30  * pointer is returned as *sigp. The length of the calculated
  31  * signature is returned via the sig_len pointer argument. The caller
  32  * should free *sigp.
  33  *
  34  * @return: 0, on success, -ve on error
  35  */
  36 int rsa_sign(struct image_sign_info *info,
  37              const struct image_region region[],
  38              int region_count, uint8_t **sigp, uint *sig_len);
  39
  40 /**
  41  * add_verify_data() - Add verification information to FDT
  42  *
  43  * Add public key information to the FDT node, suitable for
  44  * verification at run-time. The information added depends on the
  45  * algorithm being used.
  46  *
  47  * @info:       Specifies key and FIT information
  48  * @keydest:    Destination FDT blob for public key data
  49  * @return: 0, on success, -ve on error
  50 */
  51 int rsa_add_verify_data(struct image_sign_info *info, void *keydest);
  52 #else
  53 static inline int rsa_sign(struct image_sign_info *info,
  54                 const struct image_region region[], int region_count,
  55                 uint8_t **sigp, uint *sig_len)
  56 {
  57         return -ENXIO;
  58 }
  59
  60 static inline int rsa_add_verify_data(struct image_sign_info *info,
  61                                       void *keydest)
  62 {
  63         return -ENXIO;
  64 }
  65 #endif
  66
  67 #if IMAGE_ENABLE_VERIFY
  68 /**
  69  * rsa_verify() - Verify a signature against some data
  70  *
  71  * Verify a RSA PKCS1.5 signature against an expected hash.
  72  *
  73  * @info:       Specifies key and FIT information
  74  * @data:       Pointer to the input data
  75  * @data_len:   Data length
  76  * @sig:        Signature
  77  * @sig_len:    Number of bytes in signature
  78  * @return 0 if verified, -ve on error
  79  */
  80 int rsa_verify(struct image_sign_info *info,
  81                const struct image_region region[], int region_count,
  82                uint8_t *sig, uint sig_len);
  83 #else
  84 static inline int rsa_verify(struct image_sign_info *info,
  85                 const struct image_region region[], int region_count,
  86                 uint8_t *sig, uint sig_len)
  87 {
  88         return -ENXIO;
  89 }
  90 #endif
  91
  92 #endif