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Remove support for non-byte-aligned RSA keys

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Remove the need for an extra function mbedtls_rsa_get_bitlen. Use
mbedtls_rsa_get_len, which is only correct for keys whose size is a
multiple of 8. Key sizes that aren't a multiple of 8 are extremely
rarely used, so in practice this is not a problematic limitation.
This commit is contained in:
Gilles Peskine 2018-11-12 18:37:42 +01:00
parent 9eaab02607
commit aac64a2839
1 changed files with 6 additions and 2 deletions
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8
library/psa_crypto.c
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@ -579,7 +579,11 @@ static psa_status_t psa_import_rsa_key( mbedtls_pk_context *pk,
else
{
mbedtls_rsa_context *rsa = mbedtls_pk_rsa( *pk );
size_t bits = mbedtls_rsa_get_bitlen( rsa );
/* The size of an RSA key doesn't have to be a multiple of 8.
* Mbed TLS supports non-byte-aligned key sizes, but not well.
* For example, mbedtls_rsa_get_len() returns the key size in
* bytes, not in bits. */
size_t bits = PSA_BYTES_TO_BITS( mbedtls_rsa_get_len( rsa ) );
if( bits > PSA_VENDOR_RSA_MAX_KEY_BITS )
return( PSA_ERROR_NOT_SUPPORTED );
*p_rsa = rsa;
@ -799,7 +803,7 @@ static size_t psa_get_key_bits( const key_slot_t *slot )
return( slot->data.raw.bytes * 8 );
#if defined(MBEDTLS_RSA_C)
if( PSA_KEY_TYPE_IS_RSA( slot->type ) )
return( mbedtls_rsa_get_bitlen( slot->data.rsa ) );
return( PSA_BYTES_TO_BITS( mbedtls_rsa_get_len( slot->data.rsa ) ) );
#endif /* defined(MBEDTLS_RSA_C) */
#if defined(MBEDTLS_ECP_C)
if( PSA_KEY_TYPE_IS_ECC( slot->type ) )