137864f55
Denys Vlasenko
2021-10-05
Subject
tls: add debugging scaffolding to P256 code
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networking/tls_sp_c32.c+53 -0
| @@ -136,6 +136,53 @@ static void sp_256_from_bin_10(sp_digit* r, const uint8_t* a) | |
| } | |
| } | |
| + | #if SP_DEBUG |
| + | static void dump_256(const char *fmt, const sp_digit* cr) |
| + | { |
| + | sp_digit* r = (sp_digit*)cr; |
| + | uint8_t b32[32]; |
| + | sp_256_to_bin_10(r, b32); |
| + | dump_hex(fmt, b32, 32); |
| + | } |
| + | static void dump_512(const char *fmt, const sp_digit* cr) |
| + | { |
| + | sp_digit* r = (sp_digit*)cr; |
| + | uint8_t a[64]; |
| + | int i, j, s, b; |
| + | |
| + | /* sp_512_norm_10: */ |
| + | for (i = 0; i < 19; i++) { |
| + | r[i+1] += r[i] >> 26; |
| + | r[i] &= 0x3ffffff; |
| + | } |
| + | /* sp_512_to_bin_10: */ |
| + | s = 0; |
| + | j = 512 / 8 - 1; |
| + | a[j] = 0; |
| + | for (i = 0; i < 20 && j >= 0; i++) { |
| + | b = 0; |
| + | a[j--] |= r[i] << s; b += 8 - s; |
| + | if (j < 0) |
| + | break; |
| + | while (b < 26) { |
| + | a[j--] = r[i] >> b; b += 8; |
| + | if (j < 0) |
| + | break; |
| + | } |
| + | s = 8 - (b - 26); |
| + | if (j >= 0) |
| + | a[j] = 0; |
| + | if (s != 0) |
| + | j++; |
| + | } |
| + | |
| + | dump_hex(fmt, a, 64); |
| + | } |
| + | #else |
| + | # define dump_256(...) ((void)0) |
| + | # define dump_512(...) ((void)0) |
| + | #endif |
| + | |
| /* Convert a point of big-endian 32-byte x,y pair to type sp_point. */ | |
| static void sp_256_point_from_bin2x32(sp_point* p, const uint8_t *bin2x32) | |
| { | |
| @@ -743,6 +790,9 @@ static void sp_256_ecc_mulmod_10(sp_point* r, const sp_point* g, const sp_digit* | |
| sp_256_mod_mul_norm_10(t[1].x, g->x); | |
| sp_256_mod_mul_norm_10(t[1].y, g->y); | |
| sp_256_mod_mul_norm_10(t[1].z, g->z); | |
| + | dump_512("t[1].x %s\n", t[1].x); |
| + | dump_512("t[1].y %s\n", t[1].y); |
| + | dump_512("t[1].z %s\n", t[1].z); |
| i = 9; | |
| c = 22; | |
| @@ -875,7 +925,10 @@ static void sp_ecc_make_key_256(sp_digit privkey[10], uint8_t *pubkey) | |
| sp_point point[1]; | |
| sp_256_ecc_gen_k_10(privkey); | |
| + | dump_256("privkey %s\n", privkey); |
| sp_256_ecc_mulmod_base_10(point, privkey); | |
| + | dump_512("point->x %s\n", point->x); |
| + | dump_512("point->y %s\n", point->y); |
| sp_256_to_bin_10(point->x, pubkey); | |
| sp_256_to_bin_10(point->y, pubkey + 32); | |