wolfSSL/wolfssl
1
0
Fork 1
mirror of https://github.com/wolfSSL/wolfssl.git synced 2025-07-30 10:47:28 +02:00
Code Issues Packages Projects Releases Wiki Activity

SP ARM64 asm: fix Montgomery reduction by 4

Browse Source 
Handle add overflow properly in generic Montgomery reduction for 4
words. Used when reducing back to order of P-256 curve.
This commit is contained in:
Sean Parkinson
2023-11-07 11:39:03 +10:00
parent 2ee94023f9
commit 01c3345c7a
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
wolfcrypt/src/sp_arm64.c
View File

@ -40512,6 +40512,8 @@ static void sp_256_mont_mul_order_4(sp_digit* r, const sp_digit* a, const sp_dig
"adcs x11, x11, x3\n\t" "adcs x11, x11, x3\n\t"
"umulh x4, x16, x17\n\t" "umulh x4, x16, x17\n\t"
"adcs x12, x12, x4\n\t" "adcs x12, x12, x4\n\t"
"# x15 == -1\n\t"
"adcs x19, x19, x15\n\t"
"csel x13, x13, xzr, cs\n\t" "csel x13, x13, xzr, cs\n\t"
"csel x14, x14, xzr, cs\n\t" "csel x14, x14, xzr, cs\n\t"
"csel x15, x15, xzr, cs\n\t" "csel x15, x15, xzr, cs\n\t"
@ -40703,6 +40705,8 @@ static void sp_256_mont_sqr_order_4(sp_digit* r, const sp_digit* a)
"adcs x10, x10, x2\n\t" "adcs x10, x10, x2\n\t"
"umulh x3, x15, x16\n\t" "umulh x3, x15, x16\n\t"
"adcs x11, x11, x3\n\t" "adcs x11, x11, x3\n\t"
"# x14 == -1\n\t"
"adcs x17, x17, x14\n\t"
"csel x12, x12, xzr, cs\n\t" "csel x12, x12, xzr, cs\n\t"
"csel x13, x13, xzr, cs\n\t" "csel x13, x13, xzr, cs\n\t"
"csel x14, x14, xzr, cs\n\t" "csel x14, x14, xzr, cs\n\t"
@ -40889,6 +40893,8 @@ static void sp_256_mont_sqr_n_order_4(sp_digit* r, const sp_digit* a, int n)
"adcs x10, x10, x2\n\t" "adcs x10, x10, x2\n\t"
"umulh x3, x15, x16\n\t" "umulh x3, x15, x16\n\t"
"adcs x11, x11, x3\n\t" "adcs x11, x11, x3\n\t"
"# x14 == -1\n\t"
"adcs x17, x17, x14\n\t"
"csel x12, x12, xzr, cs\n\t" "csel x12, x12, xzr, cs\n\t"
"csel x13, x13, xzr, cs\n\t" "csel x13, x13, xzr, cs\n\t"
"csel x14, x14, xzr, cs\n\t" "csel x14, x14, xzr, cs\n\t"