Make early protocol auth mechanism generic, and add SRP

Adds everything needed for SRP (and everything works too),
but still deactivated, as protocol v25 init packets aren't final yet.
Can be activated by changing the LATEST_PROTOCOL_VERSION header to 25
inside networkprotocol.h.

1 files changed, 404 insertions, 0 deletions

diff --git a/src/util/sha256.c b/src/util/sha256.c
new file mode 100644
index 000000000..311aac4a8
--- /dev/null
+++ b/src/util/sha256.c
@@ -0,0 +1,404 @@
+/* crypto/sha/sha256.c */
+/* ====================================================================
+ * Copyright (c) 2004 The OpenSSL Project.  All rights reserved
+ * according to the OpenSSL license [found in ../../LICENSE].
+ * ====================================================================
+ */
+# include <stdlib.h>
+# include <string.h>
+
+# include <util/sha2.h>
+
+#  define OPENSSL_VERSION_TEXT    "OpenSSL 1.0.2a 19 Mar 2015"
+# define OPENSSL_VERSION_PTEXT   " part of " OPENSSL_VERSION_TEXT
+
+const char SHA256_version[] = "SHA-256" OPENSSL_VERSION_PTEXT;
+
+/* mem_clr.c */
+unsigned char cleanse_ctr = 0;
+void OPENSSL_cleanse(void *ptr, size_t len)
+{
+    unsigned char *p = ptr;
+    size_t loop = len, ctr = cleanse_ctr;
+    while (loop--) {
+        *(p++) = (unsigned char)ctr;
+        ctr += (17 + ((size_t)p & 0xF));
+    }
+    p = memchr(ptr, (unsigned char)ctr, len);
+    if (p)
+        ctr += (63 + (size_t)p);
+    cleanse_ctr = (unsigned char)ctr;
+}
+
+# define fips_md_init(alg) fips_md_init_ctx(alg, alg)
+#  define fips_md_init_ctx(alg, cx) \
+        int alg##_Init(cx##_CTX *c)
+#  define fips_cipher_abort(alg) while(0)
+
+fips_md_init_ctx(SHA224, SHA256)
+{
+    memset(c, 0, sizeof(*c));
+    c->h[0] = 0xc1059ed8UL;
+    c->h[1] = 0x367cd507UL;
+    c->h[2] = 0x3070dd17UL;
+    c->h[3] = 0xf70e5939UL;
+    c->h[4] = 0xffc00b31UL;
+    c->h[5] = 0x68581511UL;
+    c->h[6] = 0x64f98fa7UL;
+    c->h[7] = 0xbefa4fa4UL;
+    c->md_len = SHA224_DIGEST_LENGTH;
+    return 1;
+}
+
+fips_md_init(SHA256)
+{
+    memset(c, 0, sizeof(*c));
+    c->h[0] = 0x6a09e667UL;
+    c->h[1] = 0xbb67ae85UL;
+    c->h[2] = 0x3c6ef372UL;
+    c->h[3] = 0xa54ff53aUL;
+    c->h[4] = 0x510e527fUL;
+    c->h[5] = 0x9b05688cUL;
+    c->h[6] = 0x1f83d9abUL;
+    c->h[7] = 0x5be0cd19UL;
+    c->md_len = SHA256_DIGEST_LENGTH;
+    return 1;
+}
+
+unsigned char *SHA224(const unsigned char *d, size_t n, unsigned char *md)
+{
+    SHA256_CTX c;
+    static unsigned char m[SHA224_DIGEST_LENGTH];
+
+    if (md == NULL)
+        md = m;
+    SHA224_Init(&c);
+    SHA256_Update(&c, d, n);
+    SHA256_Final(md, &c);
+    OPENSSL_cleanse(&c, sizeof(c));
+    return (md);
+}
+
+unsigned char *SHA256(const unsigned char *d, size_t n, unsigned char *md)
+{
+    SHA256_CTX c;
+    static unsigned char m[SHA256_DIGEST_LENGTH];
+
+    if (md == NULL)
+        md = m;
+    SHA256_Init(&c);
+    SHA256_Update(&c, d, n);
+    SHA256_Final(md, &c);
+    OPENSSL_cleanse(&c, sizeof(c));
+    return (md);
+}
+
+int SHA224_Update(SHA256_CTX *c, const void *data, size_t len)
+{
+    return SHA256_Update(c, data, len);
+}
+
+int SHA224_Final(unsigned char *md, SHA256_CTX *c)
+{
+    return SHA256_Final(md, c);
+}
+
+# define DATA_ORDER_IS_BIG_ENDIAN
+
+# define HASH_LONG               SHA_LONG
+# define HASH_CTX                SHA256_CTX
+# define HASH_CBLOCK             SHA_CBLOCK
+/*
+ * Note that FIPS180-2 discusses "Truncation of the Hash Function Output."
+ * default: case below covers for it. It's not clear however if it's
+ * permitted to truncate to amount of bytes not divisible by 4. I bet not,
+ * but if it is, then default: case shall be extended. For reference.
+ * Idea behind separate cases for pre-defined lenghts is to let the
+ * compiler decide if it's appropriate to unroll small loops.
+ */
+# define HASH_MAKE_STRING(c,s)   do {    \
+        unsigned long ll;               \
+        unsigned int  nn;               \
+        switch ((c)->md_len)            \
+        {   case SHA224_DIGEST_LENGTH:  \
+                for (nn=0;nn<SHA224_DIGEST_LENGTH/4;nn++)       \
+                {   ll=(c)->h[nn]; (void)HOST_l2c(ll,(s));   }  \
+                break;                  \
+            case SHA256_DIGEST_LENGTH:  \
+                for (nn=0;nn<SHA256_DIGEST_LENGTH/4;nn++)       \
+                {   ll=(c)->h[nn]; (void)HOST_l2c(ll,(s));   }  \
+                break;                  \
+            default:                    \
+                if ((c)->md_len > SHA256_DIGEST_LENGTH) \
+                    return 0;                           \
+                for (nn=0;nn<(c)->md_len/4;nn++)                \
+                {   ll=(c)->h[nn]; (void)HOST_l2c(ll,(s));   }  \
+                break;                  \
+        }                               \
+        } while (0)
+
+# define HASH_UPDATE             SHA256_Update
+# define HASH_TRANSFORM          SHA256_Transform
+# define HASH_FINAL              SHA256_Final
+# define HASH_BLOCK_DATA_ORDER   sha256_block_data_order
+# ifndef SHA256_ASM
+static
+# endif
+void sha256_block_data_order(SHA256_CTX *ctx, const void *in, size_t num);
+
+# include "md32_common.h"
+
+# ifndef SHA256_ASM
+static const SHA_LONG K256[64] = {
+    0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
+    0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
+    0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
+    0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
+    0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
+    0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
+    0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
+    0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
+    0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
+    0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
+    0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
+    0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
+    0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
+    0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
+    0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
+    0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
+};
+
+/*
+ * FIPS specification refers to right rotations, while our ROTATE macro
+ * is left one. This is why you might notice that rotation coefficients
+ * differ from those observed in FIPS document by 32-N...
+ */
+#  define Sigma0(x)       (ROTATE((x),30) ^ ROTATE((x),19) ^ ROTATE((x),10))
+#  define Sigma1(x)       (ROTATE((x),26) ^ ROTATE((x),21) ^ ROTATE((x),7))
+#  define sigma0(x)       (ROTATE((x),25) ^ ROTATE((x),14) ^ ((x)>>3))
+#  define sigma1(x)       (ROTATE((x),15) ^ ROTATE((x),13) ^ ((x)>>10))
+
+#  define Ch(x,y,z)       (((x) & (y)) ^ ((~(x)) & (z)))
+#  define Maj(x,y,z)      (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+
+#  ifdef OPENSSL_SMALL_FOOTPRINT
+
+static void sha256_block_data_order(SHA256_CTX *ctx, const void *in,
+                                    size_t num)
+{
+    unsigned MD32_REG_T a, b, c, d, e, f, g, h, s0, s1, T1, T2;
+    SHA_LONG X[16], l;
+    int i;
+    const unsigned char *data = in;
+
+    while (num--) {
+
+        a = ctx->h[0];
+        b = ctx->h[1];
+        c = ctx->h[2];
+        d = ctx->h[3];
+        e = ctx->h[4];
+        f = ctx->h[5];
+        g = ctx->h[6];
+        h = ctx->h[7];
+
+        for (i = 0; i < 16; i++) {
+            HOST_c2l(data, l);
+            T1 = X[i] = l;
+            T1 += h + Sigma1(e) + Ch(e, f, g) + K256[i];
+            T2 = Sigma0(a) + Maj(a, b, c);
+            h = g;
+            g = f;
+            f = e;
+            e = d + T1;
+            d = c;
+            c = b;
+            b = a;
+            a = T1 + T2;
+        }
+
+        for (; i < 64; i++) {
+            s0 = X[(i + 1) & 0x0f];
+            s0 = sigma0(s0);
+            s1 = X[(i + 14) & 0x0f];
+            s1 = sigma1(s1);
+
+            T1 = X[i & 0xf] += s0 + s1 + X[(i + 9) & 0xf];
+            T1 += h + Sigma1(e) + Ch(e, f, g) + K256[i];
+            T2 = Sigma0(a) + Maj(a, b, c);
+            h = g;
+            g = f;
+            f = e;
+            e = d + T1;
+            d = c;
+            c = b;
+            b = a;
+            a = T1 + T2;
+        }
+
+        ctx->h[0] += a;
+        ctx->h[1] += b;
+        ctx->h[2] += c;
+        ctx->h[3] += d;
+        ctx->h[4] += e;
+        ctx->h[5] += f;
+        ctx->h[6] += g;
+        ctx->h[7] += h;
+
+    }
+}
+
+#  else
+
+#   define ROUND_00_15(i,a,b,c,d,e,f,g,h)          do {    \
+        T1 += h + Sigma1(e) + Ch(e,f,g) + K256[i];      \
+        h = Sigma0(a) + Maj(a,b,c);                     \
+        d += T1;        h += T1;                } while (0)
+
+#   define ROUND_16_63(i,a,b,c,d,e,f,g,h,X)        do {    \
+        s0 = X[(i+1)&0x0f];     s0 = sigma0(s0);        \
+        s1 = X[(i+14)&0x0f];    s1 = sigma1(s1);        \
+        T1 = X[(i)&0x0f] += s0 + s1 + X[(i+9)&0x0f];    \
+        ROUND_00_15(i,a,b,c,d,e,f,g,h);         } while (0)
+
+static void sha256_block_data_order(SHA256_CTX *ctx, const void *in,
+                                    size_t num)
+{
+    unsigned MD32_REG_T a, b, c, d, e, f, g, h, s0, s1, T1;
+    SHA_LONG X[16];
+    int i;
+    const unsigned char *data = in;
+    const union {
+        long one;
+        char little;
+    } is_endian = {
+        1
+    };
+
+    while (num--) {
+
+        a = ctx->h[0];
+        b = ctx->h[1];
+        c = ctx->h[2];
+        d = ctx->h[3];
+        e = ctx->h[4];
+        f = ctx->h[5];
+        g = ctx->h[6];
+        h = ctx->h[7];
+
+        if (!is_endian.little && sizeof(SHA_LONG) == 4
+            && ((size_t)in % 4) == 0) {
+            const SHA_LONG *W = (const SHA_LONG *)data;
+
+            T1 = X[0] = W[0];
+            ROUND_00_15(0, a, b, c, d, e, f, g, h);
+            T1 = X[1] = W[1];
+            ROUND_00_15(1, h, a, b, c, d, e, f, g);
+            T1 = X[2] = W[2];
+            ROUND_00_15(2, g, h, a, b, c, d, e, f);
+            T1 = X[3] = W[3];
+            ROUND_00_15(3, f, g, h, a, b, c, d, e);
+            T1 = X[4] = W[4];
+            ROUND_00_15(4, e, f, g, h, a, b, c, d);
+            T1 = X[5] = W[5];
+            ROUND_00_15(5, d, e, f, g, h, a, b, c);
+            T1 = X[6] = W[6];
+            ROUND_00_15(6, c, d, e, f, g, h, a, b);
+            T1 = X[7] = W[7];
+            ROUND_00_15(7, b, c, d, e, f, g, h, a);
+            T1 = X[8] = W[8];
+            ROUND_00_15(8, a, b, c, d, e, f, g, h);
+            T1 = X[9] = W[9];
+            ROUND_00_15(9, h, a, b, c, d, e, f, g);
+            T1 = X[10] = W[10];
+            ROUND_00_15(10, g, h, a, b, c, d, e, f);
+            T1 = X[11] = W[11];
+            ROUND_00_15(11, f, g, h, a, b, c, d, e);
+            T1 = X[12] = W[12];
+            ROUND_00_15(12, e, f, g, h, a, b, c, d);
+            T1 = X[13] = W[13];
+            ROUND_00_15(13, d, e, f, g, h, a, b, c);
+            T1 = X[14] = W[14];
+            ROUND_00_15(14, c, d, e, f, g, h, a, b);
+            T1 = X[15] = W[15];
+            ROUND_00_15(15, b, c, d, e, f, g, h, a);
+
+            data += SHA256_CBLOCK;
+        } else {
+            SHA_LONG l;
+
+            HOST_c2l(data, l);
+            T1 = X[0] = l;
+            ROUND_00_15(0, a, b, c, d, e, f, g, h);
+            HOST_c2l(data, l);
+            T1 = X[1] = l;
+            ROUND_00_15(1, h, a, b, c, d, e, f, g);
+            HOST_c2l(data, l);
+            T1 = X[2] = l;
+            ROUND_00_15(2, g, h, a, b, c, d, e, f);
+            HOST_c2l(data, l);
+            T1 = X[3] = l;
+            ROUND_00_15(3, f, g, h, a, b, c, d, e);
+            HOST_c2l(data, l);
+            T1 = X[4] = l;
+            ROUND_00_15(4, e, f, g, h, a, b, c, d);
+            HOST_c2l(data, l);
+            T1 = X[5] = l;
+            ROUND_00_15(5, d, e, f, g, h, a, b, c);
+            HOST_c2l(data, l);
+            T1 = X[6] = l;
+            ROUND_00_15(6, c, d, e, f, g, h, a, b);
+            HOST_c2l(data, l);
+            T1 = X[7] = l;
+            ROUND_00_15(7, b, c, d, e, f, g, h, a);
+            HOST_c2l(data, l);
+            T1 = X[8] = l;
+            ROUND_00_15(8, a, b, c, d, e, f, g, h);
+            HOST_c2l(data, l);
+            T1 = X[9] = l;
+            ROUND_00_15(9, h, a, b, c, d, e, f, g);
+            HOST_c2l(data, l);
+            T1 = X[10] = l;
+            ROUND_00_15(10, g, h, a, b, c, d, e, f);
+            HOST_c2l(data, l);
+            T1 = X[11] = l;
+            ROUND_00_15(11, f, g, h, a, b, c, d, e);
+            HOST_c2l(data, l);
+            T1 = X[12] = l;
+            ROUND_00_15(12, e, f, g, h, a, b, c, d);
+            HOST_c2l(data, l);
+            T1 = X[13] = l;
+            ROUND_00_15(13, d, e, f, g, h, a, b, c);
+            HOST_c2l(data, l);
+            T1 = X[14] = l;
+            ROUND_00_15(14, c, d, e, f, g, h, a, b);
+            HOST_c2l(data, l);
+            T1 = X[15] = l;
+            ROUND_00_15(15, b, c, d, e, f, g, h, a);
+        }
+
+        for (i = 16; i < 64; i += 8) {
+            ROUND_16_63(i + 0, a, b, c, d, e, f, g, h, X);
+            ROUND_16_63(i + 1, h, a, b, c, d, e, f, g, X);
+            ROUND_16_63(i + 2, g, h, a, b, c, d, e, f, X);
+            ROUND_16_63(i + 3, f, g, h, a, b, c, d, e, X);
+            ROUND_16_63(i + 4, e, f, g, h, a, b, c, d, X);
+            ROUND_16_63(i + 5, d, e, f, g, h, a, b, c, X);
+            ROUND_16_63(i + 6, c, d, e, f, g, h, a, b, X);
+            ROUND_16_63(i + 7, b, c, d, e, f, g, h, a, X);
+        }
+
+        ctx->h[0] += a;
+        ctx->h[1] += b;
+        ctx->h[2] += c;
+        ctx->h[3] += d;
+        ctx->h[4] += e;
+        ctx->h[5] += f;
+        ctx->h[6] += g;
+        ctx->h[7] += h;
+
+    }
+}
+
+#  endif
+# endif                         /* SHA256_ASM */