Mercurial > dropbear
annotate libtommath/bn_s_mp_invmod_slow.c @ 1855:35d504d59c05
Implement server-side support for sk-ecdsa U2F-backed keys (#142)
* Implement server-side support for sk-ecdsa U2F-backed keys
* Fix out-of-bounds read on normal ecdsa-sha2-[identifier] keys
* Fix one more potential out-of-bounds read
* Check if nistp256 curve is used in sk-ecdsa-sha2- key
It's the only allowed curve per PROTOCOL.u2f specification
* Implement server-side support for sk-ed25519 FIDO2-backed keys
* Keys with type sk-* make no sense as host keys, so they should be
disabled
* fix typo
* Make sk-ecdsa call buf_ecdsa_verify
This reduces code duplication, the SK code just handles the
different message format.
* Reduce sk specific code
The application id can be stored in signkey, then we don't need
to call sk-specific functions from svr-authpubkey
* Remove debugging output, which causes compilation errors with DEBUG_TRACE disabled
* Proper cleanup of sk_app
Co-authored-by: Matt Johnston <[email protected]>
author | egor-duda <egor-duda@users.noreply.github.com> |
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date | Sat, 22 Jan 2022 16:53:04 +0300 |
parents | 1051e4eea25a |
children |
rev | line source |
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1692
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h" |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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2 #ifdef BN_S_MP_INVMOD_SLOW_C |
1051e4eea25a
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ |
1051e4eea25a
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4 /* SPDX-License-Identifier: Unlicense */ |
1051e4eea25a
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5 |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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6 /* hac 14.61, pp608 */ |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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7 mp_err s_mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c) |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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8 { |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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9 mp_int x, y, u, v, A, B, C, D; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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10 mp_err err; |
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11 |
1051e4eea25a
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12 /* b cannot be negative */ |
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Update LibTomMath to 1.2.0 (#84)
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13 if ((b->sign == MP_NEG) || MP_IS_ZERO(b)) { |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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14 return MP_VAL; |
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Update LibTomMath to 1.2.0 (#84)
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15 } |
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Update LibTomMath to 1.2.0 (#84)
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16 |
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Update LibTomMath to 1.2.0 (#84)
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17 /* init temps */ |
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Update LibTomMath to 1.2.0 (#84)
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18 if ((err = mp_init_multi(&x, &y, &u, &v, |
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Update LibTomMath to 1.2.0 (#84)
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19 &A, &B, &C, &D, NULL)) != MP_OKAY) { |
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Update LibTomMath to 1.2.0 (#84)
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20 return err; |
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Update LibTomMath to 1.2.0 (#84)
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21 } |
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22 |
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23 /* x = a, y = b */ |
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24 if ((err = mp_mod(a, b, &x)) != MP_OKAY) goto LBL_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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25 if ((err = mp_copy(b, &y)) != MP_OKAY) goto LBL_ERR; |
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26 |
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27 /* 2. [modified] if x,y are both even then return an error! */ |
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28 if (MP_IS_EVEN(&x) && MP_IS_EVEN(&y)) { |
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29 err = MP_VAL; |
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Update LibTomMath to 1.2.0 (#84)
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30 goto LBL_ERR; |
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31 } |
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32 |
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33 /* 3. u=x, v=y, A=1, B=0, C=0,D=1 */ |
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34 if ((err = mp_copy(&x, &u)) != MP_OKAY) goto LBL_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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35 if ((err = mp_copy(&y, &v)) != MP_OKAY) goto LBL_ERR; |
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36 mp_set(&A, 1uL); |
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37 mp_set(&D, 1uL); |
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38 |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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39 top: |
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Update LibTomMath to 1.2.0 (#84)
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40 /* 4. while u is even do */ |
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41 while (MP_IS_EVEN(&u)) { |
1051e4eea25a
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42 /* 4.1 u = u/2 */ |
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43 if ((err = mp_div_2(&u, &u)) != MP_OKAY) goto LBL_ERR; |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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44 |
1051e4eea25a
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45 /* 4.2 if A or B is odd then */ |
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46 if (MP_IS_ODD(&A) || MP_IS_ODD(&B)) { |
1051e4eea25a
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47 /* A = (A+y)/2, B = (B-x)/2 */ |
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48 if ((err = mp_add(&A, &y, &A)) != MP_OKAY) goto LBL_ERR; |
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49 if ((err = mp_sub(&B, &x, &B)) != MP_OKAY) goto LBL_ERR; |
1051e4eea25a
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50 } |
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51 /* A = A/2, B = B/2 */ |
1051e4eea25a
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52 if ((err = mp_div_2(&A, &A)) != MP_OKAY) goto LBL_ERR; |
1051e4eea25a
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53 if ((err = mp_div_2(&B, &B)) != MP_OKAY) goto LBL_ERR; |
1051e4eea25a
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54 } |
1051e4eea25a
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55 |
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56 /* 5. while v is even do */ |
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57 while (MP_IS_EVEN(&v)) { |
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58 /* 5.1 v = v/2 */ |
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59 if ((err = mp_div_2(&v, &v)) != MP_OKAY) goto LBL_ERR; |
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Update LibTomMath to 1.2.0 (#84)
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60 |
1051e4eea25a
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61 /* 5.2 if C or D is odd then */ |
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62 if (MP_IS_ODD(&C) || MP_IS_ODD(&D)) { |
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63 /* C = (C+y)/2, D = (D-x)/2 */ |
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64 if ((err = mp_add(&C, &y, &C)) != MP_OKAY) goto LBL_ERR; |
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65 if ((err = mp_sub(&D, &x, &D)) != MP_OKAY) goto LBL_ERR; |
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66 } |
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67 /* C = C/2, D = D/2 */ |
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68 if ((err = mp_div_2(&C, &C)) != MP_OKAY) goto LBL_ERR; |
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69 if ((err = mp_div_2(&D, &D)) != MP_OKAY) goto LBL_ERR; |
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70 } |
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71 |
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72 /* 6. if u >= v then */ |
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73 if (mp_cmp(&u, &v) != MP_LT) { |
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Update LibTomMath to 1.2.0 (#84)
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74 /* u = u - v, A = A - C, B = B - D */ |
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75 if ((err = mp_sub(&u, &v, &u)) != MP_OKAY) goto LBL_ERR; |
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76 |
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77 if ((err = mp_sub(&A, &C, &A)) != MP_OKAY) goto LBL_ERR; |
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78 |
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79 if ((err = mp_sub(&B, &D, &B)) != MP_OKAY) goto LBL_ERR; |
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80 } else { |
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81 /* v - v - u, C = C - A, D = D - B */ |
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82 if ((err = mp_sub(&v, &u, &v)) != MP_OKAY) goto LBL_ERR; |
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83 |
1051e4eea25a
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84 if ((err = mp_sub(&C, &A, &C)) != MP_OKAY) goto LBL_ERR; |
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85 |
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86 if ((err = mp_sub(&D, &B, &D)) != MP_OKAY) goto LBL_ERR; |
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87 } |
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88 |
1051e4eea25a
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89 /* if not zero goto step 4 */ |
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90 if (!MP_IS_ZERO(&u)) { |
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91 goto top; |
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92 } |
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93 |
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94 /* now a = C, b = D, gcd == g*v */ |
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95 |
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96 /* if v != 1 then there is no inverse */ |
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97 if (mp_cmp_d(&v, 1uL) != MP_EQ) { |
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98 err = MP_VAL; |
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99 goto LBL_ERR; |
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100 } |
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101 |
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102 /* if its too low */ |
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103 while (mp_cmp_d(&C, 0uL) == MP_LT) { |
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104 if ((err = mp_add(&C, b, &C)) != MP_OKAY) goto LBL_ERR; |
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105 } |
1051e4eea25a
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106 |
1051e4eea25a
Update LibTomMath to 1.2.0 (#84)
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107 /* too big */ |
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108 while (mp_cmp_mag(&C, b) != MP_LT) { |
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109 if ((err = mp_sub(&C, b, &C)) != MP_OKAY) goto LBL_ERR; |
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110 } |
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111 |
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112 /* C is now the inverse */ |
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113 mp_exch(&C, c); |
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114 err = MP_OKAY; |
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115 LBL_ERR: |
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116 mp_clear_multi(&x, &y, &u, &v, &A, &B, &C, &D, NULL); |
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117 return err; |
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118 } |
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119 #endif |