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Fixes error and exit paths in rsa sample programs

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This commit is contained in:
Simon Butcher 2016-04-12 17:36:34 +01:00
parent 347552d8d0
commit 3d24b19a95
2 changed files with 64 additions and 45 deletions
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60
programs/pkey/rsa_decrypt.c
View file

@ -31,6 +31,7 @@
#else #else
#include <stdio.h> #include <stdio.h>
#define polarssl_printf printf #define polarssl_printf printf
#define polarssl_exit exit
#endif #endif
#if defined(POLARSSL_BIGNUM_C) && defined(POLARSSL_RSA_C) && \ #if defined(POLARSSL_BIGNUM_C) && defined(POLARSSL_RSA_C) && \
@ -58,7 +59,7 @@ int main( void )
int main( int argc, char *argv[] ) int main( int argc, char *argv[] )
{ {
FILE *f; FILE *f;
int ret, c; int return_val, exit_val, c;
size_t i; size_t i;
rsa_context rsa; rsa_context rsa;
entropy_context entropy; entropy_context entropy;
@ -69,9 +70,7 @@ int main( int argc, char *argv[] )
((void) argv); ((void) argv);
memset(result, 0, sizeof( result ) ); memset(result, 0, sizeof( result ) );
entropy_init( &entropy ); exit_val = 0;
rsa_init( &rsa, RSA_PKCS_V15, 0 );
ret = 1;
if( argc != 1 ) if( argc != 1 )
{ {
@ -81,17 +80,23 @@ int main( int argc, char *argv[] )
polarssl_printf( "\n" ); polarssl_printf( "\n" );
#endif #endif
return ret; polarssl_exit( 1 );
} }
polarssl_printf( "\n . Seeding the random number generator..." ); polarssl_printf( "\n . Seeding the random number generator..." );
fflush( stdout ); fflush( stdout );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy, entropy_init( &entropy );
rsa_init( &rsa, RSA_PKCS_V15, 0 );
return_val = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers, (const unsigned char *) pers,
strlen( pers ) ) ) != 0 ) strlen( pers ) );
if( return_val != 0 )
{ {
polarssl_printf( " failed\n ! ctr_drbg_init returned %d\n", ret ); exit_val = 1;
polarssl_printf( " failed\n ! ctr_drbg_init returned %d\n",
return_val );
goto exit; goto exit;
} }
@ -100,21 +105,24 @@ int main( int argc, char *argv[] )
if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL ) if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
{ {
exit_val = 1;
polarssl_printf( " failed\n ! Could not open rsa_priv.txt\n" \ polarssl_printf( " failed\n ! Could not open rsa_priv.txt\n" \
" ! Please run rsa_genkey first\n\n" ); " ! Please run rsa_genkey first\n\n" );
goto exit; goto exit;
} }
if( ( ret = mpi_read_file( &rsa.N , 16, f ) ) != 0 || if( ( return_val = mpi_read_file( &rsa.N , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.E , 16, f ) ) != 0 || ( return_val = mpi_read_file( &rsa.E , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.D , 16, f ) ) != 0 || ( return_val = mpi_read_file( &rsa.D , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.P , 16, f ) ) != 0 || ( return_val = mpi_read_file( &rsa.P , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.Q , 16, f ) ) != 0 || ( return_val = mpi_read_file( &rsa.Q , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.DP, 16, f ) ) != 0 || ( return_val = mpi_read_file( &rsa.DP, 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.DQ, 16, f ) ) != 0 || ( return_val = mpi_read_file( &rsa.DQ, 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.QP, 16, f ) ) != 0 ) ( return_val = mpi_read_file( &rsa.QP, 16, f ) ) != 0 )
{ {
polarssl_printf( " failed\n ! mpi_read_file returned %d\n\n", ret ); exit_val = 1;
polarssl_printf( " failed\n ! mpi_read_file returned %d\n\n",
return_val );
goto exit; goto exit;
} }
@ -125,10 +133,9 @@ int main( int argc, char *argv[] )
/* /*
* Extract the RSA encrypted value from the text file * Extract the RSA encrypted value from the text file
*/ */
ret = 1;
if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL ) if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
{ {
exit_val = 1;
polarssl_printf( "\n ! Could not open %s\n\n", "result-enc.txt" ); polarssl_printf( "\n ! Could not open %s\n\n", "result-enc.txt" );
goto exit; goto exit;
} }
@ -143,6 +150,7 @@ int main( int argc, char *argv[] )
if( i != rsa.len ) if( i != rsa.len )
{ {
exit_val = 1;
polarssl_printf( "\n ! Invalid RSA signature format\n\n" ); polarssl_printf( "\n ! Invalid RSA signature format\n\n" );
goto exit; goto exit;
} }
@ -153,11 +161,13 @@ int main( int argc, char *argv[] )
polarssl_printf( "\n . Decrypting the encrypted data" ); polarssl_printf( "\n . Decrypting the encrypted data" );
fflush( stdout ); fflush( stdout );
if( ( ret = rsa_pkcs1_decrypt( &rsa, ctr_drbg_random, &ctr_drbg, if( ( return_val = rsa_pkcs1_decrypt( &rsa, ctr_drbg_random, &ctr_drbg,
RSA_PRIVATE, &i, buf, result, RSA_PRIVATE, &i, buf, result,
1024 ) ) != 0 ) 1024 ) ) != 0 )
{ {
polarssl_printf( " failed\n ! rsa_pkcs1_decrypt returned %d\n\n", ret ); exit_val = 1;
polarssl_printf( " failed\n ! rsa_pkcs1_decrypt returned %d\n\n",
return_val );
goto exit; goto exit;
} }
@ -165,8 +175,6 @@ int main( int argc, char *argv[] )
polarssl_printf( "The decrypted result is: '%s'\n\n", result ); polarssl_printf( "The decrypted result is: '%s'\n\n", result );
ret = 0;
exit: exit:
ctr_drbg_free( &ctr_drbg ); ctr_drbg_free( &ctr_drbg );
entropy_free( &entropy ); entropy_free( &entropy );
@ -177,6 +185,6 @@ exit:
fflush( stdout ); getchar(); fflush( stdout ); getchar();
#endif #endif
return( ret ); return( exit_val );
} }
#endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_FS_IO */ #endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_FS_IO */

49
programs/pkey/rsa_encrypt.c
View file

@ -32,6 +32,7 @@
#include <stdio.h> #include <stdio.h>
#define polarssl_fprintf fprintf #define polarssl_fprintf fprintf
#define polarssl_printf printf #define polarssl_printf printf
#define polarssl_exit exit
#endif #endif
#if defined(POLARSSL_BIGNUM_C) && defined(POLARSSL_RSA_C) && \ #if defined(POLARSSL_BIGNUM_C) && defined(POLARSSL_RSA_C) && \
@ -59,7 +60,7 @@ int main( void )
int main( int argc, char *argv[] ) int main( int argc, char *argv[] )
{ {
FILE *f; FILE *f;
int ret; int return_val, exit_val;
size_t i; size_t i;
rsa_context rsa; rsa_context rsa;
entropy_context entropy; entropy_context entropy;
@ -68,8 +69,7 @@ int main( int argc, char *argv[] )
unsigned char buf[512]; unsigned char buf[512];
const char *pers = "rsa_encrypt"; const char *pers = "rsa_encrypt";
rsa_init( &rsa, RSA_PKCS_V15, 0 ); exit_val = 0;
ret = 1;
if( argc != 2 ) if( argc != 2 )
{ {
@ -79,18 +79,24 @@ int main( int argc, char *argv[] )
polarssl_printf( "\n" ); polarssl_printf( "\n" );
#endif #endif
goto exit; polarssl_exit( 1 );
} }
polarssl_printf( "\n . Seeding the random number generator..." ); polarssl_printf( "\n . Seeding the random number generator..." );
fflush( stdout ); fflush( stdout );
entropy_init( &entropy ); entropy_init( &entropy );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy, rsa_init( &rsa, RSA_PKCS_V15, 0 );
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 ) return_val = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) );
if( return_val != 0 )
{ {
polarssl_printf( " failed\n ! ctr_drbg_init returned %d\n", ret ); exit_val = 1;
polarssl_printf( " failed\n ! ctr_drbg_init returned %d\n",
return_val );
goto exit; goto exit;
} }
@ -99,16 +105,18 @@ int main( int argc, char *argv[] )
if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL ) if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
{ {
ret = 1; exit_val = 1;
polarssl_printf( " failed\n ! Could not open rsa_pub.txt\n" \ polarssl_printf( " failed\n ! Could not open rsa_pub.txt\n" \
" ! Please run rsa_genkey first\n\n" ); " ! Please run rsa_genkey first\n\n" );
goto exit; goto exit;
} }
if( ( ret = mpi_read_file( &rsa.N, 16, f ) ) != 0 || if( ( return_val = mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.E, 16, f ) ) != 0 ) ( return_val = mpi_read_file( &rsa.E, 16, f ) ) != 0 )
{ {
polarssl_printf( " failed\n ! mpi_read_file returned %d\n\n", ret ); exit_val = 1;
polarssl_printf( " failed\n ! mpi_read_file returned %d\n\n",
return_val );
goto exit; goto exit;
} }
@ -118,6 +126,7 @@ int main( int argc, char *argv[] )
if( strlen( argv[1] ) > 100 ) if( strlen( argv[1] ) > 100 )
{ {
exit_val = 1;
polarssl_printf( " Input data larger than 100 characters.\n\n" ); polarssl_printf( " Input data larger than 100 characters.\n\n" );
goto exit; goto exit;
} }
@ -130,11 +139,13 @@ int main( int argc, char *argv[] )
polarssl_printf( "\n . Generating the RSA encrypted value" ); polarssl_printf( "\n . Generating the RSA encrypted value" );
fflush( stdout ); fflush( stdout );
if( ( ret = rsa_pkcs1_encrypt( &rsa, ctr_drbg_random, &ctr_drbg, if( ( return_val = rsa_pkcs1_encrypt( &rsa, ctr_drbg_random, &ctr_drbg,
RSA_PUBLIC, strlen( argv[1] ), RSA_PUBLIC, strlen( argv[1] ),
input, buf ) ) != 0 ) input, buf ) ) != 0 )
{ {
polarssl_printf( " failed\n ! rsa_pkcs1_encrypt returned %d\n\n", ret ); exit_val = 1;
polarssl_printf( " failed\n ! rsa_pkcs1_encrypt returned %d\n\n",
return_val );
goto exit; goto exit;
} }
@ -143,7 +154,7 @@ int main( int argc, char *argv[] )
*/ */
if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL ) if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
{ {
ret = 1; exit_val = 1;
polarssl_printf( " failed\n ! Could not create %s\n\n", "result-enc.txt" ); polarssl_printf( " failed\n ! Could not create %s\n\n", "result-enc.txt" );
goto exit; goto exit;
} }
@ -166,7 +177,7 @@ exit:
fflush( stdout ); getchar(); fflush( stdout ); getchar();
#endif #endif
return( ret ); return( exit_val );
} }
#endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_ENTROPY_C && #endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_ENTROPY_C &&
POLARSSL_FS_IO && POLARSSL_CTR_DRBG_C */ POLARSSL_FS_IO && POLARSSL_CTR_DRBG_C */