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Merge remote-tracking branch 'janos/iotssl-1156-ecdsa-sample-and-doc-clarification' into development

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* janos/iotssl-1156-ecdsa-sample-and-doc-clarification:
  Clarify the use of ECDSA API
This commit is contained in:
Manuel Pégourié-Gonnard 2017-06-08 10:16:54 +02:00
commit c44c3c288d
3 changed files with 53 additions and 7 deletions
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31
programs/pkey/ecdsa.c
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@ -37,6 +37,7 @@
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/ecdsa.h"
#include "mbedtls/sha256.h"
#include <string.h>
#endif
@ -101,8 +102,10 @@ int main( int argc, char *argv[] )
mbedtls_ecdsa_context ctx_sign, ctx_verify;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
unsigned char hash[] = "This should be the hash of a message.";
unsigned char sig[512];
mbedtls_sha256_context sha256_ctx;
unsigned char message[100];
unsigned char hash[32];
unsigned char sig[MBEDTLS_ECDSA_MAX_LEN];
size_t sig_len;
const char *pers = "ecdsa";
((void) argv);
@ -110,8 +113,10 @@ int main( int argc, char *argv[] )
mbedtls_ecdsa_init( &ctx_sign );
mbedtls_ecdsa_init( &ctx_verify );
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_sha256_init( &sha256_ctx );
memset(sig, 0, sizeof( sig ) );
memset( sig, 0, sizeof( sig ) );
memset( message, 0x25, sizeof( message ) );
ret = 1;
if( argc != 1 )
@ -155,9 +160,23 @@ int main( int argc, char *argv[] )
dump_pubkey( " + Public key: ", &ctx_sign );
/*
* Sign some message hash
* Compute message hash
*/
mbedtls_printf( " . Signing message..." );
mbedtls_printf( " . Computing message hash..." );
fflush( stdout );
mbedtls_sha256_starts( &sha256_ctx, 0 );
mbedtls_sha256_update( &sha256_ctx, message, sizeof( message ) );
mbedtls_sha256_finish( &sha256_ctx, hash );
mbedtls_printf( " ok\n" );
dump_buf( " + Hash: ", hash, sizeof( hash ) );
/*
* Sign message hash
*/
mbedtls_printf( " . Signing message hash..." );
fflush( stdout );
if( ( ret = mbedtls_ecdsa_write_signature( &ctx_sign, MBEDTLS_MD_SHA256,
@ -170,7 +189,6 @@ int main( int argc, char *argv[] )
}
mbedtls_printf( " ok (signature length = %u)\n", (unsigned int) sig_len );
dump_buf( " + Hash: ", hash, sizeof hash );
dump_buf( " + Signature: ", sig, sig_len );
/*
@ -224,6 +242,7 @@ exit:
mbedtls_ecdsa_free( &ctx_sign );
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
mbedtls_sha256_free( &sha256_ctx );
return( ret );
}