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PSA Crypto API Examples #3833

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PSA Crypto API Examples #3833

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20da22c
Created first version of PSA Crypto API examples
Oct 28, 2020
8f79e2c
Enabling compilation under Linux
Oct 29, 2020
a364e15
Added psa_hkdf example
hannestschofenig Jun 3, 2021
cf1aceb
Update to the hash example"
Jul 7, 2021
4579856
Update to the PSA Crypto API examples
hannestschofenig Oct 12, 2021
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254 changes: 249 additions & 5 deletions programs/pkey/key_app_writer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -45,12 +45,12 @@

#if defined(MBEDTLS_PEM_WRITE_C)
#define USAGE_OUT \
" output_file=%%s default: keyfile.pem\n" \
" output_format=pem|der default: pem\n"
" output_file=%%s default: keyfile.pem\n" \
" output_format=pem|der|bin default: pem\n"
#else
#define USAGE_OUT \
" output_file=%%s default: keyfile.der\n" \
" output_format=der default: der\n"
" output_file=%%s default: keyfile.der\n" \
" output_format=der|bin default: der\n"
#endif

#if defined(MBEDTLS_PEM_WRITE_C)
Expand All @@ -76,6 +76,7 @@

#define OUTPUT_FORMAT_PEM 0
#define OUTPUT_FORMAT_DER 1
#define OUTPUT_FORMAT_BIN 2

#define USAGE \
"\n usage: key_app_writer param=<>...\n" \
Expand Down Expand Up @@ -193,13 +194,63 @@ static int write_private_key( mbedtls_pk_context *key, const char *output_file )
return( 0 );
}

static int ascii2uc(const char c, unsigned char *uc)
{
if( ( c >= '0' ) && ( c <= '9' ) )
*uc = c - '0';
else if( ( c >= 'a' ) && ( c <= 'f' ) )
*uc = c - 'a' + 10;
else if( ( c >= 'A' ) && ( c <= 'F' ) )
*uc = c - 'A' + 10;
else
return( -1 );

return( 0 );
}

int hexstring_to_binary( unsigned char *obuf,
size_t obufmax,
const char *ibuf,
size_t *len )
{
unsigned char uc, uc2;

*len = strlen( ibuf );

/* Must be even number of bytes. */
if ( ( *len ) & 1 )
return( -1 );
*len /= 2;

if ( (*len) > obufmax )
return( -1 );

while( *ibuf != 0 )
{
if ( ascii2uc( *(ibuf++), &uc ) != 0 )
return( -1 );

if ( ascii2uc( *(ibuf++), &uc2 ) != 0 )
return( -1 );

*(obuf++) = ( uc << 4 ) | uc2;
}

return( 0 );
}

int main( int argc, char *argv[] )
{
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
char buf[1024];
int i;
char *p, *q;
uint8_t output[80];
size_t output_len;
char tmp[80];
size_t olen;
uint8_t *ptr;

mbedtls_pk_context key;
mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
Expand Down Expand Up @@ -261,6 +312,9 @@ int main( int argc, char *argv[] )
#endif
if( strcmp( q, "der" ) == 0 )
opt.output_format = OUTPUT_FORMAT_DER;
else
if( strcmp( q, "bin" ) == 0 )
opt.output_format = OUTPUT_FORMAT_BIN;
else
goto usage;
}
Expand Down Expand Up @@ -339,6 +393,101 @@ int main( int argc, char *argv[] )
mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );
mbedtls_mpi_write_file( "D : ", &ecp->d , 16, NULL );

if( opt.output_format == OUTPUT_FORMAT_BIN )
{
if( opt.output_mode == MODE_PRIVATE )
{
ptr = output;
size_t remaining_bytes=sizeof(output);

// D coordinate
ret = mbedtls_mpi_write_string( &ecp->d, 16, tmp, sizeof(tmp), &olen);

if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_string returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

if( (olen / 2) > remaining_bytes )
{
mbedtls_printf( " failed\n ! not enough memory for X coordinate -%zu bytes left but %zu bytes needed \n\n", remaining_bytes, olen );
goto exit;
}

ret = hexstring_to_binary( ptr, remaining_bytes,
tmp, &olen );

if( ret != 0 )
{
mbedtls_printf( " failed\n ! hexstring_to_binary returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

ptr += olen;
remaining_bytes -= olen;
output_len = ptr-output;
}
else if( opt.output_mode == MODE_PUBLIC )
{
ptr = output;
size_t remaining_bytes=sizeof(output);

// Uncompressed point
*ptr++=0x04;
remaining_bytes--;

// X coordinate
ret = mbedtls_mpi_write_string( &ecp->Q.X, 16, tmp, sizeof(tmp), &olen);

if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_string returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

if( (olen / 2) > remaining_bytes )
{
mbedtls_printf( " failed\n ! not enough memory for X coordinate - %zu bytes left but %zu bytes needed \n\n", remaining_bytes, olen );
goto exit;
}

ret = hexstring_to_binary( ptr, remaining_bytes,
tmp, &olen );

if( ret != 0 )
{
mbedtls_printf( " failed\n ! hexstring_to_binary returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

ptr += olen;
remaining_bytes -= olen;

// Y coordinate
ret = mbedtls_mpi_write_string( &ecp->Q.Y, 16, tmp, sizeof(tmp), &olen);

if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_string returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

if( (olen / 2) > remaining_bytes )
{
mbedtls_printf( " failed\n ! not enough memory for Y coordinate - %zu bytes left but %zu bytes needed \n\n",
remaining_bytes, olen );
goto exit;
}

ret = hexstring_to_binary( ptr, remaining_bytes, tmp, &olen );

ptr += olen;
remaining_bytes -= olen;
output_len = ptr-output;
}
}
}
else
#endif
Expand Down Expand Up @@ -392,14 +541,109 @@ int main( int argc, char *argv[] )
mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL );
mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );


if( opt.output_format == OUTPUT_FORMAT_BIN )
{
ptr = output;
size_t remaining_bytes=sizeof(output);

// Uncompressed point
*ptr++=0x04;
remaining_bytes--;

// X coordinate
ret = mbedtls_mpi_write_string( &ecp->Q.X, 16, tmp, sizeof(tmp), &olen);

if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_string returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

if( (olen / 2) > remaining_bytes )
{
mbedtls_printf( " failed\n ! not enough memory for X coordinate - %zu bytes left but %zu bytes needed \n\n", remaining_bytes, olen );
goto exit;
}

ret = hexstring_to_binary( ptr, remaining_bytes,
tmp, &olen );

if( ret != 0 )
{
mbedtls_printf( " failed\n ! hexstring_to_binary returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

ptr += olen;
remaining_bytes -= olen;

// Y coordinate
ret = mbedtls_mpi_write_string( &ecp->Q.Y, 16, tmp, sizeof(tmp), &olen);

if( ret != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_string returned -0x%04x\n\n", (unsigned int) -ret );
goto exit;
}

if( (olen / 2) > remaining_bytes )
{
mbedtls_printf( " failed\n ! not enough memory for Y coordinate - %zu bytes left but %zu bytes needed \n\n",
remaining_bytes, olen );
goto exit;
}

ret = hexstring_to_binary( ptr, remaining_bytes, tmp, &olen );

ptr += olen;
remaining_bytes -= olen;
output_len = ptr-output;
}
}
else
#endif
mbedtls_printf("key type not supported yet\n");
mbedtls_printf( " key type not supported yet\n" );
}
else
goto usage;

if( opt.output_format == OUTPUT_FORMAT_BIN )
{
FILE *f;

#if defined(_WIN32)
errno_t err = fopen_s(&f, opt.output_file, "w" );

if( err != 0 )
{
mbedtls_printf( " cannot open file '%s': %d\n ",
opt.filename, err );
goto exit;
}
#else
if( ( f = fopen( opt.output_file, "w" ) ) == NULL )
{

mbedtls_printf( " cannot open file '%s'\n ",
opt.filename );
goto exit;
}
#endif
if( fwrite( output, 1, output_len, f ) != output_len )
{
mbedtls_printf( " writing to file failed '%s'\n ", opt.filename );
fclose( f );
goto exit;
}

fclose( f );

exit_code = MBEDTLS_EXIT_SUCCESS;
goto exit;
}

if( opt.output_mode == OUTPUT_MODE_PUBLIC )
{
write_public_key( &key, opt.output_file );
Expand Down
7 changes: 7 additions & 0 deletions programs/psa/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,13 @@ set(executables
crypto_examples
key_ladder_demo
psa_constant_names
psa_random
psa_mac
psa_hkdf
psa_hash
psa_encrypt
psa_sign_verify
psa_key_agreement
)

foreach(exe IN LISTS executables)
Expand Down
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