Skip to content

Latest commit

 

History

History
150 lines (132 loc) · 10.4 KB

README.md

File metadata and controls

150 lines (132 loc) · 10.4 KB

PES-Assignment-5

Code for Assign 5 for PRES, ECEN 5813-001B, Fall 2022

Function Call Tree

main()
 |
 *-----> time_pbkdf2_hmac_isha()
                   |
                   *-----> pbkdf2_hmac_isha()
                                 |
                                 *-----> F()
                                         | 
                                         *-----> hmac_isha()
                                                     |
                                                     *-----> ISHAReset()
                                                     |
                                                     *-----> ISHAInput()
                                                     |           |
                                                     |           *-----> ISHAProcessMessageBlock()
                                                     |
                                                     *-----> ISHAResult()
                                                                 |
                                                                 *-----> ISHAPadMessage()
                                                                               |
                                                                               *-----> ISHAProcessMessageBlock()

Entire Program

  • Build Configuration : Release
  • Optimization : -O0
  • Target : Program flash action using PEMicro probes
  • Total Size Before Optimization : 19708
  • Total Size After Optimization : 15200
  • Timing Test Before Optimization: 8752 ms
  • Timing Test After Optimization : 3040 ms

pbkdf2_hmac_isha()

  • Size Before Optimization: 0x00000108
  • Size After Optimization: 0x00000108
  • Changes:
    • None
  • During time_pbkdf2_hmac_isha(), the function pbkdf2_hmac_isha() is invoked from 1 separate line:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
1 8752 ms : 0 ms 3040 ms : 0 ms time_pbkdf2_hmac_isha Unconditional

F()

  • Size Before Optimization: 0x000001b8
  • Size After Optimization: 0x00000134
  • Changes:
    • Defined iterator i as register storage
    • Used same iterator i in all loops (other than loop using iterator j) rather than having each loop declare its own iterator i
  • During time_pbkdf2_hmac_isha(), the function F() is invoked from 1 separate line:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
3 8752 ms : 362 ms 3040 ms : 137 ms pbkdf2_hmac_isha For int i=0; i<l; i++

hmac_isha()

  • Size Before Optimization: 0x00000184
  • Size After Optimization: 0x000000c2
  • Changes:
    • Removed if(key_len > ISHA_BLOCKLEN) conditional since code does not ever go into this branch. This introduces limitation of catching case where key_len > ISHA_BLOCKLEN
    • Combined for(i=0; i<key_len; i++) and for(i=key_len; i<ISHA_BLOCKLEN; i++) loops and added a conditional within loop itself
    • Combined both for(i=0; i<ISHA_BLOCKLEN; i++) loops
    • Removed keypad array and assigned directly to ipad + opad
    • Defined iterator i as register storage
  • During time_pbkdf2_hmac_isha(), the function hmac_isha() is invoked from 2 separate lines:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
3 2 ms : 0 ms 0 ms : 0 ms F Unconditional
12285 8461 ms : 1428 ms 2916 ms : 363 ms F For int j=1; j<iter; j++

ISHAReset()

  • Size Before Optimization: 0x00000060
  • Size After Optimization: 0x00000054
  • Changes:
    • Removed ctx->corrupted flag
    • Removed logic for Length_High/Length_Low bits and replaced with Length_Bytes
  • During time_pbkdf2_hmac_isha(), the function ISHAReset() is invoked from 3 separate lines:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
0 0 ms : 0 ms N/A hmac_isha If key_len > ISHA_BLOCKLEN
12288 28 ms : 28 ms 26 ms : 26 ms hmac_isha Inner ISHA
12288 28 ms : 28 ms 26 ms : 26 ms hmac_isha Outer ISHA

ISHAInput()

  • Size Before Optimization: 0x000000ae
  • Size After Optimization: 0x000000c8
  • Changes:
    • Stored length into register iterator i and replaced all instances of length with iterator i
    • Removed ctx->corrupted flag
    • Incremented message_length in-line
    • Removed logic for Length_High/Length_Low bits and replaced with Length_Bytes
    • Improved loop to go 1 byte at a time to 64 bytes at a time. Also utilized memcpy to achieve this
  • During time_pbkdf2_hmac_isha(), the function ISHAInput() is invoked from 5 separate lines:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
0 0 ms : 0 ms N/A hmac_isha If key_len > ISHA_BLOCKLEN
12288 1996 ms : 1250 ms 57 ms : 66 ms hmac_isha Inner ISHA - ipad
12288 417 ms : 399 ms 459 ms : 74 ms hmac_isha Inner ISHA - msg
12288 2000 ms : 1249 ms 65 ms : 66 ms hmac_isha Outer ISHA - opad
12288 417 ms : 409 ms 467 ms : 74 ms hmac_isha Outer ISHA - inner_digest

ISHAResult()

  • Size Before Optimization: 0x000000c0
  • Size After Optimization: 0x00000096
  • Changes:
    • Replaced all instances of (i/4) with (t >> 2)
    • Removed ctx->corrupted flag
  • During time_pbkdf2_hmac_isha(), the function ISHAResult() is invoked from 3 separate lines:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
0 0 ms : 0 ms N/A hmac_isha If key_len > ISHA_BLOCKLEN
12288 1089 ms : 148 ms 740 ms : 129 ms hmac_isha Inner ISHA
12288 1089 ms : 148 ms 740 ms : 128 ms hmac_isha Outer ISHA

ISHAPadMessage()

  • Size Before Optimization: 0x0000010e
  • Size After Optimization: 0x000000e6
  • Changes:
    • Removed while(ctx->MB_Idx < 56) loops out of if/else and put it after since it is unconditional
    • Removed logic for Length_High/Length_Low bits and replaced with Length_Bytes. This introduces limitation of not supporting message length over 0xFFFFFFFF bytes
  • During time_pbkdf2_hmac_isha(), the function ISHAPadMessage() is invoked from 1 separate line:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
24576 1902 ms : 472 ms 1250 ms : 476 ms ISHAResult If !ctx->Computed

ISHAProcessMessageBlock

  • Size Before Optimization: 0x00000152
  • Size After Optimization: 0x000000e6
  • Changes:
    • Replaced all instances of (t * 4) with (t << 2)
    • Combined both for(t = 0; t < 16; t++) loops
    • Defined iterator t as register storage
    • Removed W array and assigned directly into temp. This may decrease readability but increases performance
  • During time_pbkdf2_hmac_isha(), the function ISHAProcessMessageBlock() is invoked from 3 separate lines:
Count Total Time Before Optimization (Deep : Surface) Total Time After Optimization (Deep : Surface) Caller Invocation Details
24576 1404 ms : 1404 ms 818 ms : 853 ms ISHAInput If ctx->MB_Idx == 64
0 0 ms : 0 ms 0 ms : 0 ms ISHAPadMessage If ctx->MB_Idx > 55
24576 1462 ms : 1462 ms 769 ms : 769 ms ISHAPadMessage Unconditional