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psa: Simplify RSA public key format

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Remove pkcs-1 and rsaEncryption front matter from RSA public keys. Move
code that was shared between RSA and other key types (like EC keys) to
be used only with non-RSA keys.
This commit is contained in:
Jaeden Amero
2019-01-10 10:23:21 +00:00
committed by Jaeden Amero
parent d3a0c2c779
commit 6b19600fba
5 changed files with 102 additions and 79 deletions
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30
library/psa_crypto.c
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@ -61,6 +61,7 @@
#include "mbedtls/arc4.h"
#include "mbedtls/asn1.h"
#include "mbedtls/asn1write.h"
#include "mbedtls/bignum.h"
#include "mbedtls/blowfish.h"
#include "mbedtls/camellia.h"
@ -899,6 +900,22 @@ psa_status_t psa_get_key_information( psa_key_handle_t handle,
return( PSA_SUCCESS );
}
#if defined(MBEDTLS_RSA_C)
static int pk_write_pubkey_simple( mbedtls_pk_context *key,
unsigned char *buf, size_t size )
{
int ret;
unsigned char *c;
size_t len = 0;
c = buf + size;
MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
return( (int) len );
}
#endif /* defined(MBEDTLS_RSA_C) */
static psa_status_t psa_internal_export_key( psa_key_slot_t *slot,
uint8_t *data,
size_t data_size,
@ -969,9 +986,20 @@ static psa_status_t psa_internal_export_key( psa_key_slot_t *slot,
#endif
}
if( export_public_key || PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->type ) )
ret = mbedtls_pk_write_pubkey_der( &pk, data, data_size );
{
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
{
ret = pk_write_pubkey_simple( &pk, data, data_size );
}
else
{
ret = mbedtls_pk_write_pubkey_der( &pk, data, data_size );
}
}
else
{
ret = mbedtls_pk_write_key_der( &pk, data, data_size );
}
if( ret < 0 )
{
/* If data_size is 0 then data may be NULL and then the