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fix LTC_MECC_FP #410

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Merged
sjaeckel merged 5 commits into from
Apr 29, 2026
Merged

fix LTC_MECC_FP #410

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6affa8b
fix LTC_MECC_FP
karel-m Jun 21, 2018
2258637
Fix potential unsigned underflow.
sjaeckel Apr 27, 2026
1f28017
Fix typo
sjaeckel Apr 27, 2026
576258b
Fix ECC FP API.
sjaeckel Apr 27, 2026
9e1c617
Add CI jobs with ECC FP enabled.
sjaeckel Apr 27, 2026
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3 changes: 2 additions & 1 deletion .github/workflows/main.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,8 @@ jobs:
- { BUILDNAME: 'NO_DEPRECATED_APIS', BUILDOPTIONS: '-DLTC_NO_DEPRECATED_APIS', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'NO_TIMING_RESISTANCE', BUILDOPTIONS: '-DLTC_NO_ECC_TIMING_RESISTANT -DLTC_NO_RSA_BLINDING', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'FORTUNA_CUSTOM_OPTIONS', BUILDOPTIONS: '-DLTC_FORTUNA_USE_ENCRYPT_ONLY -DLTC_FORTUNA_RESEED_RATELIMIT_STATIC', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'PTHREAD', BUILDOPTIONS: '-DLTC_PTHREAD', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'ECC_FP', BUILDOPTIONS: '-DLTC_MECC_FP', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'ECC_FP+PTHREAD', BUILDOPTIONS: '-DLTC_MECC_FP -DLTC_PTHREAD', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'STOCK+ARGTYPE=1', BUILDOPTIONS: '-DARGTYPE=1', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'STOCK+ARGTYPE=2', BUILDOPTIONS: '-DARGTYPE=2', BUILDSCRIPT: '.ci/run.sh' }
- { BUILDNAME: 'STOCK+ARGTYPE=3', BUILDOPTIONS: '-DARGTYPE=3', BUILDSCRIPT: '.ci/run.sh' }
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2 changes: 1 addition & 1 deletion demos/timing.c
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Expand Up @@ -930,7 +930,7 @@ static void time_ecc(void)
#ifdef LTC_ECC_SECP384R1
384/8,
#endif
#ifdef LTC_ECC_SECP512R1
#ifdef LTC_ECC_SECP521R1
521/8,
#endif
100000};
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8 changes: 4 additions & 4 deletions src/headers/tomcrypt_private.h
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Expand Up @@ -625,16 +625,16 @@ int ltc_ecc_projective_add_point(const ecc_point *P, const ecc_point *Q, ecc_poi

#if defined(LTC_MECC_FP)
/* optimized point multiplication using fixed point cache (HAC algorithm 14.117) */
int ltc_ecc_fp_mulmod(void *k, ecc_point *G, ecc_point *R, void *a, void *modulus, int map);
int ltc_ecc_fp_mulmod(const void *k, const ecc_point *G, ecc_point *R, const void *ma, const void *modulus, int map);

/* functions for saving/loading/freeing/adding to fixed point cache */
int ltc_ecc_fp_save_state(unsigned char **out, unsigned long *outlen);
int ltc_ecc_fp_restore_state(unsigned char *in, unsigned long inlen);
void ltc_ecc_fp_free(void);
int ltc_ecc_fp_add_point(ecc_point *g, void *modulus, int lock);
int ltc_ecc_fp_free(void);
int ltc_ecc_fp_add_point(const ecc_point *g, const void *ma, const void *modulus, int lock);

/* lock/unlock all points currently in fixed point cache */
void ltc_ecc_fp_tablelock(int lock);
int ltc_ecc_fp_tablelock(int lock);
#endif

/* R = kG */
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