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Improve documentation of ssl_extract_add_data_from_record()

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Hanno Becker 2019-05-20 14:50:53 +01:00
parent 346a590c1c
commit 99abf51056
1 changed files with 8 additions and 5 deletions
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13
library/ssl_tls.c
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@ -1627,22 +1627,25 @@ static int ssl_cid_parse_inner_plaintext( unsigned char const *content,
} }
#endif /* MBEDTLS_SSL_CID */ #endif /* MBEDTLS_SSL_CID */
/* add_data must have size ( 13 + MBEDTLS_SSL_CID_LEN_MAX ) Bytes */ /* `add_data` must have size 13 Bytes if the CID extension is disabled,
* and 13 + CID-length Bytes if the CID extension is enabled. */
static void ssl_extract_add_data_from_record( unsigned char* add_data, static void ssl_extract_add_data_from_record( unsigned char* add_data,
size_t *add_data_len, size_t *add_data_len,
mbedtls_record *rec ) mbedtls_record *rec )
{ {
/* Quoting RFC 5246: /* Quoting RFC 5246 (TLS 1.2):
* *
* additional_data = seq_num + TLSCompressed.type + * additional_data = seq_num + TLSCompressed.type +
* TLSCompressed.version + TLSCompressed.length; * TLSCompressed.version + TLSCompressed.length;
* *
* For the CID extension, this is extended as follows: * For the CID extension, this is extended as follows
* (quoting draft-ietf-tls-dtls-connection-id-05,
* https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05):
* *
* additional_data = seq_num + DTLSPlaintext.type + * additional_data = seq_num + DTLSPlaintext.type +
* DTLSPlaintext.version + * DTLSPlaintext.version +
* cid + // New input * cid +
* cid_length + // New input * cid_length +
* length_of_DTLSInnerPlaintext; * length_of_DTLSInnerPlaintext;
*/ */