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Improve some comments and internal documentation

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-07-28 11:42:31 +02:00
parent 1e94128f30
commit 74503bb5fc
2 changed files with 8 additions and 4 deletions
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8
include/mbedtls/ssl_internal.h
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@ -869,9 +869,11 @@ int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
* max_data_len bytes from \p data. * max_data_len bytes from \p data.
* *
* \param ctx The HMAC context. It must have keys configured * \param ctx The HMAC context. It must have keys configured
* with mbedtls_md_hmac_starts(). It is reset using * with mbedtls_md_hmac_starts() and use one of the
* mbedtls_md_hmac_reset() after the computation is * following hashes: SHA-384, SHA-256, SHA-1 or MD-5.
* complete to prepare for the next computation. * It is reset using mbedtls_md_hmac_reset() after
* the computation is complete to prepare for the
* next computation.
* \param add_data The additional data prepended to \p data. This * \param add_data The additional data prepended to \p data. This
* must point to a readable buffer of \p add_data_len * must point to a readable buffer of \p add_data_len
* bytes. * bytes.

4
library/ssl_tls.c
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@ -1863,7 +1863,7 @@ int mbedtls_ssl_cf_hmac(
* extension to the MD API in order to get constant-flow behaviour. * extension to the MD API in order to get constant-flow behaviour.
* *
* HMAC(msg) is defined as HASH(okey + HASH(ikey + msg)) where + means * HMAC(msg) is defined as HASH(okey + HASH(ikey + msg)) where + means
* concatenation, and okey/ikey is the XOR of the key with some fix bit * concatenation, and okey/ikey are the XOR of the key with some fixed bit
* patterns (see RFC 2104, sec. 2), which are stored in ctx->hmac_ctx. * patterns (see RFC 2104, sec. 2), which are stored in ctx->hmac_ctx.
* *
* We'll first compute inner_hash = HASH(ikey + msg) by hashing up to * We'll first compute inner_hash = HASH(ikey + msg) by hashing up to
@ -1873,6 +1873,8 @@ int mbedtls_ssl_cf_hmac(
* Then we only need to compute HASH(okey + inner_hash) and we're done. * Then we only need to compute HASH(okey + inner_hash) and we're done.
*/ */
const mbedtls_md_type_t md_alg = mbedtls_md_get_type( ctx->md_info ); const mbedtls_md_type_t md_alg = mbedtls_md_get_type( ctx->md_info );
/* TLS 1.0-1.2 only support SHA-384, SHA-256, SHA-1, MD-5,
* all of which have the same block size except SHA-384. */
const size_t block_size = md_alg == MBEDTLS_MD_SHA384 ? 128 : 64; const size_t block_size = md_alg == MBEDTLS_MD_SHA384 ? 128 : 64;
const unsigned char * const ikey = (unsigned char *) ctx->hmac_ctx; const unsigned char * const ikey = (unsigned char *) ctx->hmac_ctx;
const unsigned char * const okey = ikey + block_size; const unsigned char * const okey = ikey + block_size;