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Use PSA-based ciphers for SSL ticket protection

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This commit modifies the default SSL ticket implementation
from `library/ssl_ticket.c` to use PSA-based cipher context
for ticket creation and parsing.

As in mbedtls_ssl_derive_keys() adapted in an earlier commit,
we allow fallback to the ordinary mbedtls_cipher_setup()
if the provided cipher is not known. We do this even though
we always call mbedtls_ssl_ticket_setup() with AES-GCM
in our own code since this function is public and might
be used with other ciphers by users.
This commit is contained in:
Hanno Becker 2018-11-17 21:25:59 +00:00
parent 4724645e28
commit 329919eadf
1 changed files with 20 additions and 4 deletions
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24
library/ssl_ticket.c
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@ -154,11 +154,27 @@ int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
ret = mbedtls_cipher_setup_psa( &ctx->keys[0].ctx,
cipher_info, TICKET_AUTH_TAG_BYTES );
if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
return( ret );
/* We don't yet expect to support all ciphers through PSA,
* so allow fallback to ordinary mbedtls_cipher_setup(). */
if( ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 )
return( ret );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
ret = mbedtls_cipher_setup_psa( &ctx->keys[1].ctx,
cipher_info, TICKET_AUTH_TAG_BYTES );
if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
return( ret );
if( ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
return( ret );
}
if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )