39a3ef51b
Denys Vlasenko
2021-04-27
Subject
tls: shrink p256_base
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Commit Diff GitHub →
networking/tls_sp_c32.c+18 -12
| @@ -72,18 +72,6 @@ static const sp_digit p256_mod[10] = { | |
| #define p256_mp_mod ((sp_digit)0x000001) | |
| - | /* The base point of curve P256. */ |
| - | static const sp_point p256_base = { |
| - | /* X ordinate */ |
| - | { 0x098c296,0x04e5176,0x33a0f4a,0x204b7ac,0x277037d,0x0e9103c,0x3ce6e56,0x1091fe2,0x1f2e12c,0x01ac5f4 }, |
| - | /* Y ordinate */ |
| - | { 0x3bf51f5,0x1901a0d,0x1ececbb,0x15dacc5,0x22bce33,0x303e785,0x27eb4a7,0x1fe6e3b,0x2e2fe1a,0x013f8d0 }, |
| - | /* Z ordinate */ |
| - | { 0x0000001,0x0000000,0x0000000,0x0000000,0x0000000,0x0000000,0x0000000,0x0000000,0x0000000,0x0000000 }, |
| - | /* infinity */ |
| - | 0 |
| - | }; |
| - | |
| /* Write r as big endian to byte aray. | |
| * Fixed length number of bytes written: 32 | |
| * | |
| @@ -798,6 +786,24 @@ static void sp_256_ecc_mulmod_10(sp_point* r, const sp_point* g, const sp_digit* | |
| */ | |
| static void sp_256_ecc_mulmod_base_10(sp_point* r, sp_digit* k /*, int map*/) | |
| { | |
| + | /* Since this function is called only once, save space: |
| + | * don't have "static const sp_point p256_base = {...}", |
| + | * it would have more zeros than data. |
| + | */ |
| + | static const sp_digit base_x[] = { |
| + | 0x098c296,0x04e5176,0x33a0f4a,0x204b7ac,0x277037d,0x0e9103c,0x3ce6e56,0x1091fe2,0x1f2e12c,0x01ac5f4 |
| + | }; |
| + | static const sp_digit base_y[] = { |
| + | 0x3bf51f5,0x1901a0d,0x1ececbb,0x15dacc5,0x22bce33,0x303e785,0x27eb4a7,0x1fe6e3b,0x2e2fe1a,0x013f8d0 |
| + | }; |
| + | sp_point p256_base; |
| + | |
| + | memset(&p256_base, 0, sizeof(p256_base)); |
| + | memcpy(p256_base.x, base_x, sizeof(base_x)); |
| + | memcpy(p256_base.y, base_y, sizeof(base_y)); |
| + | p256_base.z[0] = 1; |
| + | /*p256_base.infinity = 0;*/ |
| + | |
| sp_256_ecc_mulmod_10(r, &p256_base, k /*, map*/); | |
| } | |