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Don't use 48 as a magic number in ssl_derive_keys()

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In multiple places, it occurrs as the fixed length of
the master secret, so use a constant with a descriptive
name instead. This is reinforced by the fact the some
further occurrences of '48' are semantically different.
This commit is contained in:
Hanno Becker 2018-11-05 12:45:16 +00:00
parent 5916c99cc3
commit 4d057f61a7
1 changed files with 9 additions and 3 deletions
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12
library/ssl_tls.c
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@ -643,6 +643,10 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
const mbedtls_cipher_info_t *cipher_info; const mbedtls_cipher_info_t *cipher_info;
const mbedtls_md_info_t *md_info; const mbedtls_md_info_t *md_info;
/* cf. RFC 5246, Section 8.1:
* "The master secret is always exactly 48 bytes in length." */
size_t const master_secret_len = 48;
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
unsigned char session_hash[48]; unsigned char session_hash[48];
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
@ -807,14 +811,15 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
salt, salt_len, salt, salt_len,
(unsigned char const *) lbl, (unsigned char const *) lbl,
(size_t) strlen( lbl ), (size_t) strlen( lbl ),
48 ); master_secret_len );
if( status != PSA_SUCCESS ) if( status != PSA_SUCCESS )
{ {
psa_generator_abort( &generator ); psa_generator_abort( &generator );
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
} }
status = psa_generator_read( &generator, session->master, 48 ); status = psa_generator_read( &generator, session->master,
master_secret_len );
if( status != PSA_SUCCESS ) if( status != PSA_SUCCESS )
{ {
psa_generator_abort( &generator ); psa_generator_abort( &generator );
@ -830,7 +835,8 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
{ {
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
lbl, salt, salt_len, lbl, salt, salt_len,
session->master, 48 ); session->master,
master_secret_len );
if( ret != 0 ) if( ret != 0 )
{ {
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );