Mercurial > dropbear
annotate libtommath/bn_mp_expt_u32.c @ 1705:5b701bf529aa
Fix ChaCha20 on 32-bit platforms (#99)
* Fix ChaCha20 on 32-bit platforms
On 32-bit platforms with old compiler STORE64H() parameter is
not auto-expanded to 64-bit value, causing wrong IV data.
Spotted on BCM4706 MIPS32r2 with GCC 4.2.4:
Exit before auth: Integrity error (bad packet size 2065808956)
* Fix Chacha20-Poly1305 and AES-GCM debug messages
Functions were renamed earlier and trace messages - not.
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
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date | Fri, 29 May 2020 18:26:22 +0500 |
parents | 1051e4eea25a |
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rev | line source |
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1692
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Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_EXPT_U32_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ |
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4 /* SPDX-License-Identifier: Unlicense */ |
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5 |
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6 /* calculate c = a**b using a square-multiply algorithm */ |
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7 mp_err mp_expt_u32(const mp_int *a, uint32_t b, mp_int *c) |
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8 { |
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9 mp_err err; |
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10 |
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11 mp_int g; |
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12 |
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13 if ((err = mp_init_copy(&g, a)) != MP_OKAY) { |
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14 return err; |
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15 } |
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16 |
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17 /* set initial result */ |
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18 mp_set(c, 1uL); |
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19 |
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20 while (b > 0u) { |
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21 /* if the bit is set multiply */ |
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22 if ((b & 1u) != 0u) { |
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23 if ((err = mp_mul(c, &g, c)) != MP_OKAY) { |
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24 goto LBL_ERR; |
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25 } |
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26 } |
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27 |
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28 /* square */ |
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29 if (b > 1u) { |
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30 if ((err = mp_sqr(&g, &g)) != MP_OKAY) { |
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31 goto LBL_ERR; |
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32 } |
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33 } |
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34 |
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35 /* shift to next bit */ |
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36 b >>= 1; |
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37 } |
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38 |
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39 err = MP_OKAY; |
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40 |
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41 LBL_ERR: |
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42 mp_clear(&g); |
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43 return err; |
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44 } |
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45 |
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46 #endif |