wg: constanter time encoding
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
parent
206e8f08e2
commit
2bca99893f
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@ -1559,25 +1559,25 @@ int wg_key_from_base64(wg_key key, const wg_key_b64_string base64)
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{
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unsigned int i;
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int val;
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volatile uint8_t ret = 0;
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if (strlen(base64) != sizeof(wg_key_b64_string) - 1 || base64[sizeof(wg_key_b64_string) - 2] != '=') {
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errno = EINVAL;
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if (strlen(base64) != sizeof(wg_key_b64_string) - 1 || base64[sizeof(wg_key_b64_string) - 2] != '=')
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goto out;
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}
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for (i = 0; i < 32 / 3; ++i) {
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val = decode_base64(&base64[i * 4]);
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if (val < 0)
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goto out;
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ret |= (uint32_t)val >> 31;
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key[i * 3 + 0] = (val >> 16) & 0xff;
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key[i * 3 + 1] = (val >> 8) & 0xff;
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key[i * 3 + 2] = val & 0xff;
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}
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val = decode_base64((const char[]){ base64[i * 4 + 0], base64[i * 4 + 1], base64[i * 4 + 2], 'A' });
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if (val < 0 || val & 0xff)
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goto out;
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ret |= ((uint32_t)val >> 31) | (val & 0xff);
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key[i * 3 + 0] = (val >> 16) & 0xff;
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key[i * 3 + 1] = (val >> 8) & 0xff;
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errno = 0;
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errno = EINVAL & ~((ret - 1) >> 8);
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out:
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return -errno;
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}
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@ -50,6 +50,7 @@ static inline int decode_base64(const char src[4])
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bool key_from_base64(uint8_t key[static WG_KEY_LEN], const char *base64)
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{
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unsigned int i;
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volatile uint8_t ret = 0;
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int val;
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if (strlen(base64) != WG_KEY_LEN_BASE64 - 1 || base64[WG_KEY_LEN_BASE64 - 2] != '=')
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@ -57,18 +58,17 @@ bool key_from_base64(uint8_t key[static WG_KEY_LEN], const char *base64)
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for (i = 0; i < WG_KEY_LEN / 3; ++i) {
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val = decode_base64(&base64[i * 4]);
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if (val < 0)
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return false;
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ret |= (uint32_t)val >> 31;
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key[i * 3 + 0] = (val >> 16) & 0xff;
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key[i * 3 + 1] = (val >> 8) & 0xff;
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key[i * 3 + 2] = val & 0xff;
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}
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val = decode_base64((const char[]){ base64[i * 4 + 0], base64[i * 4 + 1], base64[i * 4 + 2], 'A' });
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if (val < 0 || val & 0xff)
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return false;
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ret |= ((uint32_t)val >> 31) | (val & 0xff);
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key[i * 3 + 0] = (val >> 16) & 0xff;
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key[i * 3 + 1] = (val >> 8) & 0xff;
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return true;
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return 1 & ((ret - 1) >> 8);
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}
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void key_to_hex(char hex[static WG_KEY_LEN_HEX], const uint8_t key[static WG_KEY_LEN])
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@ -84,27 +84,33 @@ void key_to_hex(char hex[static WG_KEY_LEN_HEX], const uint8_t key[static WG_KEY
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bool key_from_hex(uint8_t key[static WG_KEY_LEN], const char *hex)
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{
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uint8_t c, c_acc = 0, c_alpha0, c_alpha, c_num0, c_num, c_val, state = 0;
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uint8_t c, c_acc = 0, c_alpha0, c_alpha, c_num0, c_num, c_val;
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volatile uint8_t ret = 0;
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if (strlen(hex) != WG_KEY_LEN_HEX - 1)
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return false;
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for (unsigned int i = 0; i < WG_KEY_LEN_HEX - 1; ++i) {
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for (unsigned int i = 0; i < WG_KEY_LEN_HEX - 1; i += 2) {
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c = (uint8_t)hex[i];
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c_num = c ^ 48U;
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c_num0 = (c_num - 10U) >> 8;
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c_alpha = (c & ~32U) - 55U;
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c_alpha0 = ((c_alpha - 10U) ^ (c_alpha - 16U)) >> 8;
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if (!(c_num0 | c_alpha0))
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return false;
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ret |= ((c_num0 | c_alpha0) - 1) >> 8;
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c_val = (c_num0 & c_num) | (c_alpha0 & c_alpha);
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if (!state)
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c_acc = c_val * 16U;
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else
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c = (uint8_t)hex[i + 1];
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c_num = c ^ 48U;
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c_num0 = (c_num - 10U) >> 8;
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c_alpha = (c & ~32U) - 55U;
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c_alpha0 = ((c_alpha - 10U) ^ (c_alpha - 16U)) >> 8;
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ret |= ((c_num0 | c_alpha0) - 1) >> 8;
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c_val = (c_num0 & c_num) | (c_alpha0 & c_alpha);
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key[i / 2] = c_acc | c_val;
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state = ~state;
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}
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return true;
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return 1 & ((ret - 1) >> 8);
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}
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bool key_is_zero(const uint8_t key[static WG_KEY_LEN])
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