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gsm/a5: Rewrite equation doc with proper numbering 

No idea where I copied the original from but here we use the
other notation. (matches wikipedia and sources)

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2012-03-01 19:54:02 +01:00
parent a9efc12ccd
commit 2dafed51e5
1 changed files with 4 additions and 4 deletions
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8
src/gsm/a5.c
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@ -89,10 +89,10 @@ osmo_a5(int n, const uint8_t *key, uint32_t fn, ubit_t *dl, ubit_t *ul)
#define A5_R3_MASK ((1<<A5_R3_LEN)-1)
#define A5_R4_MASK ((1<<A5_R4_LEN)-1)
#define A5_R1_TAPS 0x072000 /* x^19 + x^5 + x^2 + x + 1 */
#define A5_R2_TAPS 0x300000 /* x^22 + x + 1 */
#define A5_R3_TAPS 0x700080 /* x^23 + x^15 + x^2 + x + 1 */
#define A5_R4_TAPS 0x010800 /* x^17 + x^5 + 1 */
#define A5_R1_TAPS 0x072000 /* x^19 + x^18 + x^17 + x^14 + 1 */
#define A5_R2_TAPS 0x300000 /* x^22 + x^21 + 1 */
#define A5_R3_TAPS 0x700080 /* x^23 + x^22 + x^21 + x^8 + 1 */
#define A5_R4_TAPS 0x010800 /* x^17 + x^12 + 1 */
/*! \brief Computes parity of a 32-bit word
* \param[in] x 32 bit word