1  /*
 2   *  Copyright (C) 2017 - This file is part of libecc project
 3   *
 4   *  Authors:
 5   *      Ryad BENADJILA <ryadbenadjila@gmail.com>
 6   *      Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr>
 7   *      Jean-Pierre FLORI <jean-pierre.flori@ssi.gouv.fr>
 8   *
 9   *  Contributors:
10   *      Nicolas VIVET <nicolas.vivet@ssi.gouv.fr>
11   *      Karim KHALFALLAH <karim.khalfallah@ssi.gouv.fr>
12   *
13   *  This software is licensed under a dual BSD and GPL v2 license.
14   *  See LICENSE file at the root folder of the project.
15   */
16  #include <libecc/lib_ecc_config.h>
17  #include <libecc/lib_ecc_types.h>
18  #ifdef WITH_SIG_ECSDSA
19  
20  #ifndef __ECSDSA_H__
21  #define __ECSDSA_H__
22  #include <libecc/words/words.h>
23  #include <libecc/sig/ec_key.h>
24  #include <libecc/utils/utils.h>
25  #include <libecc/hash/hash_algs.h>
26  #include <libecc/curves/curves.h>
27  
28  #define ECSDSA_R_LEN(hsize) (hsize)
29  #define ECSDSA_S_LEN(q_bit_len) (BYTECEIL(q_bit_len))
30  #define ECSDSA_SIGLEN(hsize, q_bit_len) (ECSDSA_R_LEN(hsize) + \
31  					 ECSDSA_S_LEN(q_bit_len))
32  #define ECSDSA_MAX_SIGLEN ECSDSA_SIGLEN(MAX_DIGEST_SIZE, CURVES_MAX_Q_BIT_LEN)
33  
34  /*
35   * Compute max signature length for all the mechanisms enabled
36   * in the library (see lib_ecc_config.h). Having that done during
37   * preprocessing sadly requires some verbosity.
38   */
39  #ifndef EC_MAX_SIGLEN
40  #define EC_MAX_SIGLEN 0
41  #endif
42  #if ((EC_MAX_SIGLEN) < (ECSDSA_MAX_SIGLEN))
43  #undef EC_MAX_SIGLEN
44  #define EC_MAX_SIGLEN ECSDSA_MAX_SIGLEN
45  #endif
46  
47  ATTRIBUTE_WARN_UNUSED_RET int ecsdsa_init_pub_key(ec_pub_key *out_pub, const ec_priv_key *in_priv);
48  
49  ATTRIBUTE_WARN_UNUSED_RET int ecsdsa_siglen(u16 p_bit_len, u16 q_bit_len, u8 hsize, u8 blocksize,
50  		  u8 *siglen);
51  
52  typedef struct {
53  	hash_context h_ctx;
54  	nn k;
55  	word_t magic;
56  } ecsdsa_sign_data;
57  
58  ATTRIBUTE_WARN_UNUSED_RET int _ecsdsa_sign_init(struct ec_sign_context *ctx);
59  
60  ATTRIBUTE_WARN_UNUSED_RET int _ecsdsa_sign_update(struct ec_sign_context *ctx,
61  			const u8 *chunk, u32 chunklen);
62  
63  ATTRIBUTE_WARN_UNUSED_RET int _ecsdsa_sign_finalize(struct ec_sign_context *ctx, u8 *sig, u8 siglen);
64  
65  typedef struct {
66  	hash_context h_ctx;
67  	u8 r[MAX_DIGEST_SIZE];
68  	nn s;
69  	word_t magic;
70  } ecsdsa_verify_data;
71  
72  ATTRIBUTE_WARN_UNUSED_RET int _ecsdsa_verify_init(struct ec_verify_context *ctx,
73  			const u8 *sig, u8 siglen);
74  
75  ATTRIBUTE_WARN_UNUSED_RET int _ecsdsa_verify_update(struct ec_verify_context *ctx,
76  			  const u8 *chunk, u32 chunklen);
77  
78  ATTRIBUTE_WARN_UNUSED_RET int _ecsdsa_verify_finalize(struct ec_verify_context *ctx);
79  
80  #endif /* __ECSDSA_H__ */
81  #endif /* WITH_SIG_ECSDSA */