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author | Denys Vlasenko | 2021-10-05 13:47:42 +0200 |
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committer | Denys Vlasenko | 2021-10-05 13:50:11 +0200 |
commit | 137864f559e7eff1f929958d3999359c7070ed91 (patch) | |
tree | 369d1c465bbdc3030061c777ab7fd68ed41bfe26 /networking | |
parent | 389329efbed15122bb3fba59e9919d870301eb93 (diff) | |
download | busybox-137864f559e7eff1f929958d3999359c7070ed91.zip busybox-137864f559e7eff1f929958d3999359c7070ed91.tar.gz |
tls: add debugging scaffolding to P256 code
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking')
-rw-r--r-- | networking/tls_sp_c32.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/networking/tls_sp_c32.c b/networking/tls_sp_c32.c index f4902f7..5b4c7e9 100644 --- a/networking/tls_sp_c32.c +++ b/networking/tls_sp_c32.c @@ -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); |