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Add TLS 1.2 PSK master secret generation

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This commit is contained in:
Janos Follath 2019-06-17 08:44:03 +01:00
parent 51f4a0f9ac
commit 6660f0eb98
1 changed files with 69 additions and 5 deletions
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74
library/psa_crypto.c
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@ -4727,6 +4727,22 @@ static psa_status_t psa_tls12_prf_input( psa_tls12_prf_key_derivation_t *prf,
return( PSA_ERROR_INVALID_ARGUMENT );
}
static psa_status_t psa_tls12_prf_psk_to_ms_input(
psa_tls12_prf_key_derivation_t *prf,
psa_algorithm_t hash_alg,
psa_key_derivation_step_t step,
const uint8_t *data,
size_t data_length )
{
(void) prf;
(void) hash_alg;
(void) step;
(void) data;
(void) data_length;
return( PSA_ERROR_INVALID_ARGUMENT );
}
#else
static psa_status_t psa_tls12_prf_set_seed( psa_tls12_prf_key_derivation_t *prf,
const uint8_t *data,
@ -4765,6 +4781,38 @@ static psa_status_t psa_tls12_prf_set_key( psa_tls12_prf_key_derivation_t *prf,
return( PSA_SUCCESS );
}
static psa_status_t psa_tls12_prf_psk_to_ms_set_key(
psa_tls12_prf_key_derivation_t *prf,
psa_algorithm_t hash_alg,
const uint8_t *data,
size_t data_length )
{
psa_status_t status;
unsigned char pms[ 4 + 2 * PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN ];
if( data_length > PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN )
return( PSA_ERROR_INVALID_ARGUMENT );
/* Quoting RFC 4279, Section 2:
*
* The premaster secret is formed as follows: if the PSK is N octets
* long, concatenate a uint16 with the value N, N zero octets, a second
* uint16 with the value N, and the PSK itself.
*/
pms[0] = ( data_length >> 8 ) & 0xff;
pms[1] = ( data_length >> 0 ) & 0xff;
memset( pms + 2, 0, data_length );
pms[2 + data_length + 0] = pms[0];
pms[2 + data_length + 1] = pms[1];
memcpy( pms + 4 + data_length, data, data_length );
status = psa_tls12_prf_set_key( prf, hash_alg, pms, 4 + 2 * data_length );
mbedtls_platform_zeroize( pms, sizeof( pms ) );
return( status );
}
static psa_status_t psa_tls12_prf_set_label( psa_tls12_prf_key_derivation_t *prf,
const uint8_t *data,
size_t data_length )
@ -4802,6 +4850,20 @@ static psa_status_t psa_tls12_prf_input( psa_tls12_prf_key_derivation_t *prf,
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
static psa_status_t psa_tls12_prf_psk_to_ms_input(
psa_tls12_prf_key_derivation_t *prf,
psa_algorithm_t hash_alg,
psa_key_derivation_step_t step,
const uint8_t *data,
size_t data_length )
{
if( step == PSA_KEY_DERIVATION_INPUT_SECRET )
return( psa_tls12_prf_psk_to_ms_set_key( prf, hash_alg,
data, data_length ) );
return( psa_tls12_prf_input( prf, hash_alg, step, data, data_length ) );
}
#endif /* PSA_PRE_1_0_KEY_DERIVATION */
#endif /* MBEDTLS_MD_C */
@ -4824,15 +4886,17 @@ static psa_status_t psa_key_derivation_input_internal(
else
#endif /* MBEDTLS_MD_C */
#if defined(MBEDTLS_MD_C)
/* TLS-1.2 PRF and TLS-1.2 PSK-to-MS are very similar, so share code. */
if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) ||
PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
if( PSA_ALG_IS_TLS12_PRF( kdf_alg ) )
{
// To do: implement this
status = psa_tls12_prf_input( &operation->ctx.tls12_prf,
PSA_ALG_HKDF_GET_HASH( kdf_alg ),
step, data, data_length );
}
else if( PSA_ALG_IS_TLS12_PSK_TO_MS( kdf_alg ) )
{
status = psa_tls12_prf_psk_to_ms_input( &operation->ctx.tls12_prf,
PSA_ALG_HKDF_GET_HASH( kdf_alg ),
step, data, data_length );
}
else
#endif /* MBEDTLS_MD_C */