diff options
Diffstat (limited to 'crypto/sha1-sw.c')
| -rw-r--r-- | crypto/sha1-sw.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/crypto/sha1-sw.c b/crypto/sha1-sw.c new file mode 100644 index 00000000..905d97f3 --- /dev/null +++ b/crypto/sha1-sw.c @@ -0,0 +1,155 @@ +/* + * Software implementation of SHA-1. + */ + +#include "ssh.h" +#include "sha1.h" + +static bool sha1_sw_available(void) +{ + /* Software SHA-1 is always available */ + return true; +} + +static inline uint32_t rol(uint32_t x, unsigned y) +{ + return (x << (31 & y)) | (x >> (31 & -y)); +} + +static inline uint32_t Ch(uint32_t ctrl, uint32_t if1, uint32_t if0) +{ + return if0 ^ (ctrl & (if1 ^ if0)); +} + +static inline uint32_t Maj(uint32_t x, uint32_t y, uint32_t z) +{ + return (x & y) | (z & (x | y)); +} + +static inline uint32_t Par(uint32_t x, uint32_t y, uint32_t z) +{ + return (x ^ y ^ z); +} + +static inline void sha1_sw_round( + unsigned round_index, const uint32_t *schedule, + uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d, uint32_t *e, + uint32_t f, uint32_t constant) +{ + *e = rol(*a, 5) + f + *e + schedule[round_index] + constant; + *b = rol(*b, 30); +} + +static void sha1_sw_block(uint32_t *core, const uint8_t *block) +{ + uint32_t w[SHA1_ROUNDS]; + uint32_t a,b,c,d,e; + + for (size_t t = 0; t < 16; t++) + w[t] = GET_32BIT_MSB_FIRST(block + 4*t); + + for (size_t t = 16; t < SHA1_ROUNDS; t++) + w[t] = rol(w[t - 3] ^ w[t - 8] ^ w[t - 14] ^ w[t - 16], 1); + + a = core[0]; b = core[1]; c = core[2]; d = core[3]; + e = core[4]; + + size_t t = 0; + for (size_t u = 0; u < SHA1_ROUNDS_PER_STAGE/5; u++) { + sha1_sw_round(t++,w, &a,&b,&c,&d,&e, Ch(b,c,d), SHA1_STAGE0_CONSTANT); + sha1_sw_round(t++,w, &e,&a,&b,&c,&d, Ch(a,b,c), SHA1_STAGE0_CONSTANT); + sha1_sw_round(t++,w, &d,&e,&a,&b,&c, Ch(e,a,b), SHA1_STAGE0_CONSTANT); + sha1_sw_round(t++,w, &c,&d,&e,&a,&b, Ch(d,e,a), SHA1_STAGE0_CONSTANT); + sha1_sw_round(t++,w, &b,&c,&d,&e,&a, Ch(c,d,e), SHA1_STAGE0_CONSTANT); + } + for (size_t u = 0; u < SHA1_ROUNDS_PER_STAGE/5; u++) { + sha1_sw_round(t++,w, &a,&b,&c,&d,&e, Par(b,c,d), SHA1_STAGE1_CONSTANT); + sha1_sw_round(t++,w, &e,&a,&b,&c,&d, Par(a,b,c), SHA1_STAGE1_CONSTANT); + sha1_sw_round(t++,w, &d,&e,&a,&b,&c, Par(e,a,b), SHA1_STAGE1_CONSTANT); + sha1_sw_round(t++,w, &c,&d,&e,&a,&b, Par(d,e,a), SHA1_STAGE1_CONSTANT); + sha1_sw_round(t++,w, &b,&c,&d,&e,&a, Par(c,d,e), SHA1_STAGE1_CONSTANT); + } + for (size_t u = 0; u < SHA1_ROUNDS_PER_STAGE/5; u++) { + sha1_sw_round(t++,w, &a,&b,&c,&d,&e, Maj(b,c,d), SHA1_STAGE2_CONSTANT); + sha1_sw_round(t++,w, &e,&a,&b,&c,&d, Maj(a,b,c), SHA1_STAGE2_CONSTANT); + sha1_sw_round(t++,w, &d,&e,&a,&b,&c, Maj(e,a,b), SHA1_STAGE2_CONSTANT); + sha1_sw_round(t++,w, &c,&d,&e,&a,&b, Maj(d,e,a), SHA1_STAGE2_CONSTANT); + sha1_sw_round(t++,w, &b,&c,&d,&e,&a, Maj(c,d,e), SHA1_STAGE2_CONSTANT); + } + for (size_t u = 0; u < SHA1_ROUNDS_PER_STAGE/5; u++) { + sha1_sw_round(t++,w, &a,&b,&c,&d,&e, Par(b,c,d), SHA1_STAGE3_CONSTANT); + sha1_sw_round(t++,w, &e,&a,&b,&c,&d, Par(a,b,c), SHA1_STAGE3_CONSTANT); + sha1_sw_round(t++,w, &d,&e,&a,&b,&c, Par(e,a,b), SHA1_STAGE3_CONSTANT); + sha1_sw_round(t++,w, &c,&d,&e,&a,&b, Par(d,e,a), SHA1_STAGE3_CONSTANT); + sha1_sw_round(t++,w, &b,&c,&d,&e,&a, Par(c,d,e), SHA1_STAGE3_CONSTANT); + } + + core[0] += a; core[1] += b; core[2] += c; core[3] += d; core[4] += e; + + smemclr(w, sizeof(w)); +} + +typedef struct sha1_sw { + uint32_t core[5]; + sha1_block blk; + BinarySink_IMPLEMENTATION; + ssh_hash hash; +} sha1_sw; + +static void sha1_sw_write(BinarySink *bs, const void *vp, size_t len); + +static ssh_hash *sha1_sw_new(const ssh_hashalg *alg) +{ + sha1_sw *s = snew(sha1_sw); + + s->hash.vt = alg; + BinarySink_INIT(s, sha1_sw_write); + BinarySink_DELEGATE_INIT(&s->hash, s); + return &s->hash; +} + +static void sha1_sw_reset(ssh_hash *hash) +{ + sha1_sw *s = container_of(hash, sha1_sw, hash); + + memcpy(s->core, sha1_initial_state, sizeof(s->core)); + sha1_block_setup(&s->blk); +} + +static void sha1_sw_copyfrom(ssh_hash *hcopy, ssh_hash *horig) +{ + sha1_sw *copy = container_of(hcopy, sha1_sw, hash); + sha1_sw *orig = container_of(horig, sha1_sw, hash); + + memcpy(copy, orig, sizeof(*copy)); + BinarySink_COPIED(copy); + BinarySink_DELEGATE_INIT(©->hash, copy); +} + +static void sha1_sw_free(ssh_hash *hash) +{ + sha1_sw *s = container_of(hash, sha1_sw, hash); + + smemclr(s, sizeof(*s)); + sfree(s); +} + +static void sha1_sw_write(BinarySink *bs, const void *vp, size_t len) +{ + sha1_sw *s = BinarySink_DOWNCAST(bs, sha1_sw); + + while (len > 0) + if (sha1_block_write(&s->blk, &vp, &len)) + sha1_sw_block(s->core, s->blk.block); +} + +static void sha1_sw_digest(ssh_hash *hash, uint8_t *digest) +{ + sha1_sw *s = container_of(hash, sha1_sw, hash); + + sha1_block_pad(&s->blk, BinarySink_UPCAST(s)); + for (size_t i = 0; i < 5; i++) + PUT_32BIT_MSB_FIRST(digest + 4*i, s->core[i]); +} + +SHA1_VTABLE(sw, "unaccelerated"); |