Andrew Boyson / crypto

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tls/tls-mac.c@9:f354b4859b0b, 2019-09-11 (annotated)

Committer:
andrewboyson
Date:
Wed Sep 11 07:24:21 2019 +0000
Revision:
9:f354b4859b0b
Child:
17:93feb2a51d58
Got application data to be returned but not encrypted yet

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 9:f354b4859b0b 1 #include <stdint.h>
andrewboyson 9:f354b4859b0b 2 #include "hmac-sha1.h"
andrewboyson 9:f354b4859b0b 3
andrewboyson 9:f354b4859b0b 4 /*
andrewboyson 9:f354b4859b0b 5 Calculate the MAC
andrewboyson 9:f354b4859b0b 6 seq_num + TLSCompressed.type + TLSCompressed.version + TLSCompressed.length + TLSCompressed.fragment
andrewboyson 9:f354b4859b0b 7 sequence='0000000000000000', rechdr='16 03 03', datalen='00 10'
andrewboyson 9:f354b4859b0b 8 */
andrewboyson 9:f354b4859b0b 9
andrewboyson 9:f354b4859b0b 10 void TlsMacSha1(int macKeyLength,
andrewboyson 9:f354b4859b0b 11 uint8_t* macKey,
andrewboyson 9:f354b4859b0b 12 uint64_t sequence,
andrewboyson 9:f354b4859b0b 13 uint8_t contentType,
andrewboyson 9:f354b4859b0b 14 uint8_t versionH,
andrewboyson 9:f354b4859b0b 15 uint8_t versionL,
andrewboyson 9:f354b4859b0b 16 int payloadLength,
andrewboyson 9:f354b4859b0b 17 uint8_t* payload,
andrewboyson 9:f354b4859b0b 18 uint8_t* mac)
andrewboyson 9:f354b4859b0b 19 {
andrewboyson 9:f354b4859b0b 20 struct HmacSha1Struct md;
andrewboyson 9:f354b4859b0b 21 HmacSha1Start (&md, macKey, macKeyLength);
andrewboyson 9:f354b4859b0b 22 uint8_t prequel[8 + 5];
andrewboyson 9:f354b4859b0b 23 uint8_t *p = prequel;
andrewboyson 9:f354b4859b0b 24 for (int i = 0; i < 7; i++) *p++ = 0; //sequence
andrewboyson 9:f354b4859b0b 25 *p++ = sequence;
andrewboyson 9:f354b4859b0b 26 *p++ = contentType;
andrewboyson 9:f354b4859b0b 27 *p++ = versionH;
andrewboyson 9:f354b4859b0b 28 *p++ = versionL;
andrewboyson 9:f354b4859b0b 29 *p++ = payloadLength >> 8;
andrewboyson 9:f354b4859b0b 30 *p++ = payloadLength;
andrewboyson 9:f354b4859b0b 31 HmacSha1Add (&md, prequel, sizeof(prequel));
andrewboyson 9:f354b4859b0b 32 HmacSha1Add (&md, payload, payloadLength);
andrewboyson 9:f354b4859b0b 33 HmacSha1Finish(&md, mac);
andrewboyson 9:f354b4859b0b 34 }