s0                 38 arch/x86/crypto/twofish-i586-asm_32.S #define s0	0	/* S0 Array 256 Words each */
s0                 32 arch/x86/crypto/twofish-x86_64-asm_64.S #define s0	0	/* S0 Array 256 Words each */
s0                 46 crypto/sha256_generic.c #define s0(x)       (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
s0                 78 crypto/sha512_generic.c #define s0(x)       (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))