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Add support for Montgomery curves

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Signed-off-by: Przemyslaw Stekiel <przemyslaw.stekiel@mobica.com>
This commit is contained in:
Przemyslaw Stekiel 2021-11-25 13:53:28 +01:00
parent 8590f3b5ff
commit 58ce8d8fb6
1 changed files with 54 additions and 10 deletions
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64
library/psa_crypto.c
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@ -4855,7 +4855,7 @@ static void psa_des_set_key_parity( uint8_t *data, size_t data_size )
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) || \
defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_KEY_PAIR) || \
defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_PUBLIC_KEY)
static psa_status_t psa_generate_derived_ecc_key_helper(
static psa_status_t psa_generate_derived_ecc_key_weierstrass_helper(
psa_key_slot_t *slot,
size_t bits,
psa_key_derivation_operation_t *operation,
@ -4963,17 +4963,61 @@ static psa_status_t psa_generate_derived_key_internal(
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) || \
defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_KEY_PAIR) || \
defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_PUBLIC_KEY)
if ( PSA_KEY_TYPE_IS_ECC( slot->attr.type ) &&
PSA_KEY_TYPE_ECC_GET_FAMILY( slot->attr.type ) != PSA_ECC_FAMILY_MONTGOMERY )
if ( PSA_KEY_TYPE_IS_ECC( slot->attr.type ) )
{
unsigned key_err = 0;
if ( PSA_KEY_TYPE_ECC_GET_FAMILY( slot->attr.type ) != PSA_ECC_FAMILY_MONTGOMERY )
{
/* Weierstrass elliptic curve */
unsigned key_err = 0;
gen_ecc_key:
status = psa_generate_derived_ecc_key_helper(slot, bits, operation, &data, &key_err);
if( status != PSA_SUCCESS )
goto exit;
/* Key has been created, but it doesn't meet criteria. */
if (key_err)
goto gen_ecc_key;
status = psa_generate_derived_ecc_key_weierstrass_helper(slot, bits, operation, &data, &key_err);
if( status != PSA_SUCCESS )
goto exit;
/* Key has been created, but it doesn't meet criteria. */
if (key_err)
goto gen_ecc_key;
} else
{
/* Montgomery elliptic curve */
size_t output_length;
switch( bits )
{
case 255:
output_length = 32;
break;
case 448:
output_length = 56;
break;
default:
return( PSA_ERROR_INVALID_ARGUMENT );
break;
}
data = mbedtls_calloc( 1, bytes );
if( data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
status = psa_key_derivation_output_bytes( operation, data, output_length );
if( status != PSA_SUCCESS )
goto exit;
switch( bits )
{
case 255:
data[0] &= 248;
data[31] &= 127;
data[31] |= 64;
break;
case 448:
data[0] &= 252;
data[55] |= 128;
break;
default:
/* already handled */
break;
}
}
} else
#endif
{