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pkwrite: add opaque key handling for public key exporting

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Return early from mbedtls_pk_write_pubkey_der - public opaque key
exporting is expected to contain all of the needed data, therefore it shouldn't
be written again.
This commit is contained in:
Andrzej Kurek 2018-11-19 10:07:36 -05:00
parent 23a1ccd23f
commit 5fec0860f9
1 changed files with 24 additions and 0 deletions
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24
library/pkwrite.c
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@ -46,6 +46,9 @@
#include "mbedtls/pem.h"
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
@ -161,6 +164,23 @@ int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
else
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_OPAQUE )
{
size_t buffer_size = *p - start;
psa_key_slot_t* key_slot = ( psa_key_slot_t* ) key->pk_ctx;
if ( psa_export_public_key( *key_slot, start, buffer_size, &len )
!= PSA_SUCCESS )
{
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
else
{
memmove( *p - len, start, len );
}
}
else
#endif /* MBEDTLS_USE_PSA_CRYPTO */
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
return( (int) len );
@ -177,6 +197,10 @@ int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, si
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_OPAQUE )
{
return( (int) len );
}
if( c - buf < 1 )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );