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tinyCrypt: Add ServerKeyExchange parsing code

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This commit is contained in:
Hanno Becker 2019-07-23 16:16:15 +01:00
parent d849c7ca19
commit 75f12d1eb9
4 changed files with 70 additions and 1 deletions
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29
library/ssl_tls.c
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@ -65,6 +65,35 @@ static int uecc_rng_wrapper( uint8_t *dest, unsigned int size )
return( 0 );
}
int mbedtls_ssl_ecdh_read_peerkey( mbedtls_ssl_context *ssl,
unsigned char **p, unsigned char *end )
{
size_t const secp256r1_uncompressed_point_length =
1 /* length */ + 1 /* length */ + 2 * NUM_ECC_BYTES /* data */;
if( (size_t)( end - *p ) < secp256r1_uncompressed_point_length )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Bad ECDH peer pubkey (too short)" ) );
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
}
if( (*p)[0] != 2 * NUM_ECC_BYTES + 1 ||
(*p)[1] != 0x04 )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Unexpected ECDH peer pubkey header - expected { %#02x, %#02x }, got { %#02x, %#02x }",
2 * NUM_ECC_BYTES + 1,
0x04,
(unsigned) (*p)[0],
(unsigned) (*p)[1] ) );
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
}
memcpy( ssl->handshake->ecdh_peerkey, *p + 2, 2 * NUM_ECC_BYTES );
*p += secp256r1_uncompressed_point_length;
return( 0 );
}
#endif /* MBEDTLS_USE_TINYCRYPT */
static void ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl );