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TinyCrypt ECDHE-PSK: Implement mbedtls_ssl_psk_derive_premaster()

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This commit is contained in:
Hanno Becker 2019-09-02 09:47:39 +01:00
parent d91ede14c4
commit 982da7ee0a
1 changed files with 18 additions and 2 deletions
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20
library/ssl_tls.c
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@ -2158,6 +2158,20 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
int ret;
size_t zlen;
#if defined(MBEDTLS_USE_TINYCRYPT)
const struct uECC_Curve_t * uecc_curve = uECC_secp256r1();
((void) ret);
if( !uECC_shared_secret( ssl->handshake->ecdh_peerkey,
ssl->handshake->ecdh_privkey,
p + 2,
uecc_curve ) )
{
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
}
zlen = NUM_ECC_BYTES;
#else /* MBEDTLS_USE_TINYCRYPT */
if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
p + 2, end - ( p + 2 ),
mbedtls_ssl_conf_get_frng( ssl->conf ),
@ -2167,12 +2181,14 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
return( ret );
}
MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
MBEDTLS_DEBUG_ECDH_Z );
#endif /* MBEDTLS_USE_TINYCRYPT */
*(p++) = (unsigned char)( zlen >> 8 );
*(p++) = (unsigned char)( zlen );
p += zlen;
MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
MBEDTLS_DEBUG_ECDH_Z );
}
else
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */