diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go')
| -rw-r--r-- | vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go | 66 |
1 files changed, 34 insertions, 32 deletions
diff --git a/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go index 68169c6..e5cdb9a 100644 --- a/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go +++ b/vendor/golang.org/x/crypto/salsa20/salsa/salsa20_ref.go @@ -4,6 +4,8 @@ package salsa +import "math/bits" + const rounds = 20 // core applies the Salsa20 core function to 16-byte input in, 32-byte key k, @@ -31,76 +33,76 @@ func core(out *[64]byte, in *[16]byte, k *[32]byte, c *[16]byte) { for i := 0; i < rounds; i += 2 { u := x0 + x12 - x4 ^= u<<7 | u>>(32-7) + x4 ^= bits.RotateLeft32(u, 7) u = x4 + x0 - x8 ^= u<<9 | u>>(32-9) + x8 ^= bits.RotateLeft32(u, 9) u = x8 + x4 - x12 ^= u<<13 | u>>(32-13) + x12 ^= bits.RotateLeft32(u, 13) u = x12 + x8 - x0 ^= u<<18 | u>>(32-18) + x0 ^= bits.RotateLeft32(u, 18) u = x5 + x1 - x9 ^= u<<7 | u>>(32-7) + x9 ^= bits.RotateLeft32(u, 7) u = x9 + x5 - x13 ^= u<<9 | u>>(32-9) + x13 ^= bits.RotateLeft32(u, 9) u = x13 + x9 - x1 ^= u<<13 | u>>(32-13) + x1 ^= bits.RotateLeft32(u, 13) u = x1 + x13 - x5 ^= u<<18 | u>>(32-18) + x5 ^= bits.RotateLeft32(u, 18) u = x10 + x6 - x14 ^= u<<7 | u>>(32-7) + x14 ^= bits.RotateLeft32(u, 7) u = x14 + x10 - x2 ^= u<<9 | u>>(32-9) + x2 ^= bits.RotateLeft32(u, 9) u = x2 + x14 - x6 ^= u<<13 | u>>(32-13) + x6 ^= bits.RotateLeft32(u, 13) u = x6 + x2 - x10 ^= u<<18 | u>>(32-18) + x10 ^= bits.RotateLeft32(u, 18) u = x15 + x11 - x3 ^= u<<7 | u>>(32-7) + x3 ^= bits.RotateLeft32(u, 7) u = x3 + x15 - x7 ^= u<<9 | u>>(32-9) + x7 ^= bits.RotateLeft32(u, 9) u = x7 + x3 - x11 ^= u<<13 | u>>(32-13) + x11 ^= bits.RotateLeft32(u, 13) u = x11 + x7 - x15 ^= u<<18 | u>>(32-18) + x15 ^= bits.RotateLeft32(u, 18) u = x0 + x3 - x1 ^= u<<7 | u>>(32-7) + x1 ^= bits.RotateLeft32(u, 7) u = x1 + x0 - x2 ^= u<<9 | u>>(32-9) + x2 ^= bits.RotateLeft32(u, 9) u = x2 + x1 - x3 ^= u<<13 | u>>(32-13) + x3 ^= bits.RotateLeft32(u, 13) u = x3 + x2 - x0 ^= u<<18 | u>>(32-18) + x0 ^= bits.RotateLeft32(u, 18) u = x5 + x4 - x6 ^= u<<7 | u>>(32-7) + x6 ^= bits.RotateLeft32(u, 7) u = x6 + x5 - x7 ^= u<<9 | u>>(32-9) + x7 ^= bits.RotateLeft32(u, 9) u = x7 + x6 - x4 ^= u<<13 | u>>(32-13) + x4 ^= bits.RotateLeft32(u, 13) u = x4 + x7 - x5 ^= u<<18 | u>>(32-18) + x5 ^= bits.RotateLeft32(u, 18) u = x10 + x9 - x11 ^= u<<7 | u>>(32-7) + x11 ^= bits.RotateLeft32(u, 7) u = x11 + x10 - x8 ^= u<<9 | u>>(32-9) + x8 ^= bits.RotateLeft32(u, 9) u = x8 + x11 - x9 ^= u<<13 | u>>(32-13) + x9 ^= bits.RotateLeft32(u, 13) u = x9 + x8 - x10 ^= u<<18 | u>>(32-18) + x10 ^= bits.RotateLeft32(u, 18) u = x15 + x14 - x12 ^= u<<7 | u>>(32-7) + x12 ^= bits.RotateLeft32(u, 7) u = x12 + x15 - x13 ^= u<<9 | u>>(32-9) + x13 ^= bits.RotateLeft32(u, 9) u = x13 + x12 - x14 ^= u<<13 | u>>(32-13) + x14 ^= bits.RotateLeft32(u, 13) u = x14 + x13 - x15 ^= u<<18 | u>>(32-18) + x15 ^= bits.RotateLeft32(u, 18) } x0 += j0 x1 += j1 |