#include <linux/perf_event.h>
#include <linux/bpf_perf_event.h>
#include <linux/ring_buffer.h>
+#include <linux/unaligned.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/vfs.h>
#include <sys/utsname.h>
#include <sys/resource.h>
-#include <sys/socket.h>
-#include <linux/if_alg.h>
-#include <linux/socket.h>
#include <libelf.h>
#include <gelf.h>
#include <zlib.h>
static int bpf_prog_compute_hash(struct bpf_program *prog)
{
struct bpf_insn *purged;
- int i, err;
+ int i, err = 0;
purged = calloc(prog->insns_cnt, BPF_INSN_SZ);
if (!purged)
purged[i].imm = 0;
}
}
- err = libbpf_sha256(purged, prog->insns_cnt * sizeof(struct bpf_insn),
- prog->hash, SHA256_DIGEST_LENGTH);
+ libbpf_sha256(purged, prog->insns_cnt * sizeof(struct bpf_insn),
+ prog->hash);
out:
free(purged);
return err;
free(s);
}
-int libbpf_sha256(const void *data, size_t data_sz, void *sha_out, size_t sha_out_sz)
+static inline __u32 ror32(__u32 v, int bits)
{
- struct sockaddr_alg sa = {
- .salg_family = AF_ALG,
- .salg_type = "hash",
- .salg_name = "sha256"
- };
- int sock_fd = -1;
- int op_fd = -1;
- int err = 0;
+ return (v >> bits) | (v << (32 - bits));
+}
- if (sha_out_sz != SHA256_DIGEST_LENGTH) {
- pr_warn("sha_out_sz should be exactly 32 bytes for a SHA256 digest");
- return -EINVAL;
- }
+#define SHA256_BLOCK_LENGTH 64
+#define Ch(x, y, z) (((x) & (y)) ^ (~(x) & (z)))
+#define Maj(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+#define Sigma_0(x) (ror32((x), 2) ^ ror32((x), 13) ^ ror32((x), 22))
+#define Sigma_1(x) (ror32((x), 6) ^ ror32((x), 11) ^ ror32((x), 25))
+#define sigma_0(x) (ror32((x), 7) ^ ror32((x), 18) ^ ((x) >> 3))
+#define sigma_1(x) (ror32((x), 17) ^ ror32((x), 19) ^ ((x) >> 10))
- sock_fd = socket(AF_ALG, SOCK_SEQPACKET, 0);
- if (sock_fd < 0) {
- err = -errno;
- pr_warn("failed to create AF_ALG socket for SHA256: %s\n", errstr(err));
- return err;
- }
+static const __u32 sha256_K[64] = {
+ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
+ 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+ 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
+ 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+ 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
+ 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+ 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
+ 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+ 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
+ 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+ 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
+};
- if (bind(sock_fd, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
- err = -errno;
- pr_warn("failed to bind to AF_ALG socket for SHA256: %s\n", errstr(err));
- goto out;
- }
+#define SHA256_ROUND(i, a, b, c, d, e, f, g, h) \
+ { \
+ __u32 tmp = h + Sigma_1(e) + Ch(e, f, g) + sha256_K[i] + w[i]; \
+ d += tmp; \
+ h = tmp + Sigma_0(a) + Maj(a, b, c); \
+ }
+
+static void sha256_blocks(__u32 state[8], const __u8 *data, size_t nblocks)
+{
+ while (nblocks--) {
+ __u32 a = state[0];
+ __u32 b = state[1];
+ __u32 c = state[2];
+ __u32 d = state[3];
+ __u32 e = state[4];
+ __u32 f = state[5];
+ __u32 g = state[6];
+ __u32 h = state[7];
+ __u32 w[64];
+ int i;
+
+ for (i = 0; i < 16; i++)
+ w[i] = get_unaligned_be32(&data[4 * i]);
+ for (; i < ARRAY_SIZE(w); i++)
+ w[i] = sigma_1(w[i - 2]) + w[i - 7] +
+ sigma_0(w[i - 15]) + w[i - 16];
+ for (i = 0; i < ARRAY_SIZE(w); i += 8) {
+ SHA256_ROUND(i + 0, a, b, c, d, e, f, g, h);
+ SHA256_ROUND(i + 1, h, a, b, c, d, e, f, g);
+ SHA256_ROUND(i + 2, g, h, a, b, c, d, e, f);
+ SHA256_ROUND(i + 3, f, g, h, a, b, c, d, e);
+ SHA256_ROUND(i + 4, e, f, g, h, a, b, c, d);
+ SHA256_ROUND(i + 5, d, e, f, g, h, a, b, c);
+ SHA256_ROUND(i + 6, c, d, e, f, g, h, a, b);
+ SHA256_ROUND(i + 7, b, c, d, e, f, g, h, a);
+ }
+ state[0] += a;
+ state[1] += b;
+ state[2] += c;
+ state[3] += d;
+ state[4] += e;
+ state[5] += f;
+ state[6] += g;
+ state[7] += h;
+ data += SHA256_BLOCK_LENGTH;
+ }
+}
+
+void libbpf_sha256(const void *data, size_t len, __u8 out[SHA256_DIGEST_LENGTH])
+{
+ __u32 state[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+ 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
+ const __be64 bitcount = cpu_to_be64((__u64)len * 8);
+ __u8 final_data[2 * SHA256_BLOCK_LENGTH] = { 0 };
+ size_t final_len = len % SHA256_BLOCK_LENGTH;
+ int i;
- op_fd = accept(sock_fd, NULL, 0);
- if (op_fd < 0) {
- err = -errno;
- pr_warn("failed to accept from AF_ALG socket for SHA256: %s\n", errstr(err));
- goto out;
- }
+ sha256_blocks(state, data, len / SHA256_BLOCK_LENGTH);
- if (write(op_fd, data, data_sz) != data_sz) {
- err = -errno;
- pr_warn("failed to write data to AF_ALG socket for SHA256: %s\n", errstr(err));
- goto out;
- }
+ memcpy(final_data, data + len - final_len, final_len);
+ final_data[final_len] = 0x80;
+ final_len = round_up(final_len + 9, SHA256_BLOCK_LENGTH);
+ memcpy(&final_data[final_len - 8], &bitcount, 8);
- if (read(op_fd, sha_out, SHA256_DIGEST_LENGTH) != SHA256_DIGEST_LENGTH) {
- err = -errno;
- pr_warn("failed to read SHA256 from AF_ALG socket: %s\n", errstr(err));
- goto out;
- }
+ sha256_blocks(state, final_data, final_len / SHA256_BLOCK_LENGTH);
-out:
- if (op_fd >= 0)
- close(op_fd);
- if (sock_fd >= 0)
- close(sock_fd);
- return err;
+ for (i = 0; i < ARRAY_SIZE(state); i++)
+ put_unaligned_be32(state[i], &out[4 * i]);
}
projects / thirdparty / kernel / stable.git / commitdiff
