openssl: Add workaround if ECC Brainpool curves are not defined
authorTobias Brunner <tobias@strongswan.org>
Thu, 17 Oct 2013 11:31:17 +0000 (13:31 +0200)
committerTobias Brunner <tobias@strongswan.org>
Thu, 17 Oct 2013 11:36:08 +0000 (13:36 +0200)
src/libstrongswan/plugins/openssl/openssl_ec_diffie_hellman.c

index 93aeaf2..c43fe45 100644 (file)
@@ -19,6 +19,7 @@
 
 #include <openssl/ec.h>
 #include <openssl/objects.h>
+#include <openssl/bn.h>
 
 #include "openssl_ec_diffie_hellman.h"
 #include "openssl_util.h"
@@ -268,35 +269,270 @@ METHOD(diffie_hellman_t, destroy, void,
 }
 
 /**
- * Create an EC_KEY for ECC Brainpool curves as defined by OpenSSL, they are not
- * defined in releases < 1.0.2, but we don't check the version in case somebody
- * backorted them.
+ * ECC Brainpool curves are not available in OpenSSL releases < 1.0.2, but we
+ * don't check the version in case somebody backported them.
+ */
+#if (!defined(NID_brainpoolP224r1) || !defined(NID_brainpoolP256r1) || \
+        !defined(NID_brainpoolP384r1) || !defined(NID_brainpoolP512r1))
+
+/**
+ * Parameters for ECC Brainpool curves
+ */
+typedef struct {
+       /** DH group */
+       diffie_hellman_group_t group;
+
+       /** The prime p specifying the base field */
+       const chunk_t p;
+
+       /** Coefficient a of the elliptic curve E: y^2 = x^3 + ax + b (mod p) */
+       const chunk_t a;
+
+       /** Coefficient b */
+       const chunk_t b;
+
+       /** x coordinate of base point G (a point in E of prime order) */
+       const chunk_t x;
+
+       /** y coordinate of base point G */
+       const chunk_t y;
+
+       /** Prime order q of the group generated by G */
+       const chunk_t q;
+
+} bp_curve;
+
+/**
+ * List of ECC Brainpool curves
+ */
+static bp_curve bp_curves[] = {
+       {
+               /* ECC Brainpool 224-bit curve (RFC 5639), brainpoolP224r1 */
+               .group = ECP_224_BP,
+               .p = chunk_from_chars(
+                       0xD7,0xC1,0x34,0xAA,0x26,0x43,0x66,0x86,0x2A,0x18,0x30,0x25,0x75,0xD1,0xD7,0x87,
+                       0xB0,0x9F,0x07,0x57,0x97,0xDA,0x89,0xF5,0x7E,0xC8,0xC0,0xFF),
+               .a = chunk_from_chars(
+                       0x68,0xA5,0xE6,0x2C,0xA9,0xCE,0x6C,0x1C,0x29,0x98,0x03,0xA6,0xC1,0x53,0x0B,0x51,
+                       0x4E,0x18,0x2A,0xD8,0xB0,0x04,0x2A,0x59,0xCA,0xD2,0x9F,0x43),
+               .b = chunk_from_chars(
+                       0x25,0x80,0xF6,0x3C,0xCF,0xE4,0x41,0x38,0x87,0x07,0x13,0xB1,0xA9,0x23,0x69,0xE3,
+                       0x3E,0x21,0x35,0xD2,0x66,0xDB,0xB3,0x72,0x38,0x6C,0x40,0x0B),
+               .x = chunk_from_chars(
+                       0x0D,0x90,0x29,0xAD,0x2C,0x7E,0x5C,0xF4,0x34,0x08,0x23,0xB2,0xA8,0x7D,0xC6,0x8C,
+                       0x9E,0x4C,0xE3,0x17,0x4C,0x1E,0x6E,0xFD,0xEE,0x12,0xC0,0x7D),
+               .y = chunk_from_chars(
+                       0x58,0xAA,0x56,0xF7,0x72,0xC0,0x72,0x6F,0x24,0xC6,0xB8,0x9E,0x4E,0xCD,0xAC,0x24,
+                       0x35,0x4B,0x9E,0x99,0xCA,0xA3,0xF6,0xD3,0x76,0x14,0x02,0xCD),
+               .q = chunk_from_chars(
+                       0xD7,0xC1,0x34,0xAA,0x26,0x43,0x66,0x86,0x2A,0x18,0x30,0x25,0x75,0xD0,0xFB,0x98,
+                       0xD1,0x16,0xBC,0x4B,0x6D,0xDE,0xBC,0xA3,0xA5,0xA7,0x93,0x9F),
+       },
+       {
+               /* ECC Brainpool 256-bit curve (RFC 5639), brainpoolP256r1 */
+               .group = ECP_256_BP,
+               .p = chunk_from_chars(
+                       0xA9,0xFB,0x57,0xDB,0xA1,0xEE,0xA9,0xBC,0x3E,0x66,0x0A,0x90,0x9D,0x83,0x8D,0x72,
+                       0x6E,0x3B,0xF6,0x23,0xD5,0x26,0x20,0x28,0x20,0x13,0x48,0x1D,0x1F,0x6E,0x53,0x77),
+               .a = chunk_from_chars(
+                       0x7D,0x5A,0x09,0x75,0xFC,0x2C,0x30,0x57,0xEE,0xF6,0x75,0x30,0x41,0x7A,0xFF,0xE7,
+                       0xFB,0x80,0x55,0xC1,0x26,0xDC,0x5C,0x6C,0xE9,0x4A,0x4B,0x44,0xF3,0x30,0xB5,0xD9),
+               .b = chunk_from_chars(
+                       0x26,0xDC,0x5C,0x6C,0xE9,0x4A,0x4B,0x44,0xF3,0x30,0xB5,0xD9,0xBB,0xD7,0x7C,0xBF,
+                       0x95,0x84,0x16,0x29,0x5C,0xF7,0xE1,0xCE,0x6B,0xCC,0xDC,0x18,0xFF,0x8C,0x07,0xB6),
+               .x = chunk_from_chars(
+                       0x8B,0xD2,0xAE,0xB9,0xCB,0x7E,0x57,0xCB,0x2C,0x4B,0x48,0x2F,0xFC,0x81,0xB7,0xAF,
+                       0xB9,0xDE,0x27,0xE1,0xE3,0xBD,0x23,0xC2,0x3A,0x44,0x53,0xBD,0x9A,0xCE,0x32,0x62),
+               .y = chunk_from_chars(
+                       0x54,0x7E,0xF8,0x35,0xC3,0xDA,0xC4,0xFD,0x97,0xF8,0x46,0x1A,0x14,0x61,0x1D,0xC9,
+                       0xC2,0x77,0x45,0x13,0x2D,0xED,0x8E,0x54,0x5C,0x1D,0x54,0xC7,0x2F,0x04,0x69,0x97),
+               .q = chunk_from_chars(
+                       0xA9,0xFB,0x57,0xDB,0xA1,0xEE,0xA9,0xBC,0x3E,0x66,0x0A,0x90,0x9D,0x83,0x8D,0x71,
+                       0x8C,0x39,0x7A,0xA3,0xB5,0x61,0xA6,0xF7,0x90,0x1E,0x0E,0x82,0x97,0x48,0x56,0xA7),
+       },
+       {
+               /* ECC Brainpool 384-bit curve (RFC 5639), brainpoolP384r1 */
+               .group = ECP_384_BP,
+               .p = chunk_from_chars(
+                       0x8C,0xB9,0x1E,0x82,0xA3,0x38,0x6D,0x28,0x0F,0x5D,0x6F,0x7E,0x50,0xE6,0x41,0xDF,
+                       0x15,0x2F,0x71,0x09,0xED,0x54,0x56,0xB4,0x12,0xB1,0xDA,0x19,0x7F,0xB7,0x11,0x23,
+                       0xAC,0xD3,0xA7,0x29,0x90,0x1D,0x1A,0x71,0x87,0x47,0x00,0x13,0x31,0x07,0xEC,0x53),
+               .a = chunk_from_chars(
+                       0x7B,0xC3,0x82,0xC6,0x3D,0x8C,0x15,0x0C,0x3C,0x72,0x08,0x0A,0xCE,0x05,0xAF,0xA0,
+                       0xC2,0xBE,0xA2,0x8E,0x4F,0xB2,0x27,0x87,0x13,0x91,0x65,0xEF,0xBA,0x91,0xF9,0x0F,
+                       0x8A,0xA5,0x81,0x4A,0x50,0x3A,0xD4,0xEB,0x04,0xA8,0xC7,0xDD,0x22,0xCE,0x28,0x26),
+               .b = chunk_from_chars(
+                       0x04,0xA8,0xC7,0xDD,0x22,0xCE,0x28,0x26,0x8B,0x39,0xB5,0x54,0x16,0xF0,0x44,0x7C,
+                       0x2F,0xB7,0x7D,0xE1,0x07,0xDC,0xD2,0xA6,0x2E,0x88,0x0E,0xA5,0x3E,0xEB,0x62,0xD5,
+                       0x7C,0xB4,0x39,0x02,0x95,0xDB,0xC9,0x94,0x3A,0xB7,0x86,0x96,0xFA,0x50,0x4C,0x11),
+               .x = chunk_from_chars(
+                       0x1D,0x1C,0x64,0xF0,0x68,0xCF,0x45,0xFF,0xA2,0xA6,0x3A,0x81,0xB7,0xC1,0x3F,0x6B,
+                       0x88,0x47,0xA3,0xE7,0x7E,0xF1,0x4F,0xE3,0xDB,0x7F,0xCA,0xFE,0x0C,0xBD,0x10,0xE8,
+                       0xE8,0x26,0xE0,0x34,0x36,0xD6,0x46,0xAA,0xEF,0x87,0xB2,0xE2,0x47,0xD4,0xAF,0x1E),
+               .y = chunk_from_chars(
+                       0x8A,0xBE,0x1D,0x75,0x20,0xF9,0xC2,0xA4,0x5C,0xB1,0xEB,0x8E,0x95,0xCF,0xD5,0x52,
+                       0x62,0xB7,0x0B,0x29,0xFE,0xEC,0x58,0x64,0xE1,0x9C,0x05,0x4F,0xF9,0x91,0x29,0x28,
+                       0x0E,0x46,0x46,0x21,0x77,0x91,0x81,0x11,0x42,0x82,0x03,0x41,0x26,0x3C,0x53,0x15),
+               .q = chunk_from_chars(
+                       0x8C,0xB9,0x1E,0x82,0xA3,0x38,0x6D,0x28,0x0F,0x5D,0x6F,0x7E,0x50,0xE6,0x41,0xDF,
+                       0x15,0x2F,0x71,0x09,0xED,0x54,0x56,0xB3,0x1F,0x16,0x6E,0x6C,0xAC,0x04,0x25,0xA7,
+                       0xCF,0x3A,0xB6,0xAF,0x6B,0x7F,0xC3,0x10,0x3B,0x88,0x32,0x02,0xE9,0x04,0x65,0x65),
+       },
+       {
+               /* ECC Brainpool 512-bit curve (RFC 5639), brainpoolP512r1 */
+               .group = ECP_512_BP,
+               .p = chunk_from_chars(
+                       0xAA,0xDD,0x9D,0xB8,0xDB,0xE9,0xC4,0x8B,0x3F,0xD4,0xE6,0xAE,0x33,0xC9,0xFC,0x07,
+                       0xCB,0x30,0x8D,0xB3,0xB3,0xC9,0xD2,0x0E,0xD6,0x63,0x9C,0xCA,0x70,0x33,0x08,0x71,
+                       0x7D,0x4D,0x9B,0x00,0x9B,0xC6,0x68,0x42,0xAE,0xCD,0xA1,0x2A,0xE6,0xA3,0x80,0xE6,
+                       0x28,0x81,0xFF,0x2F,0x2D,0x82,0xC6,0x85,0x28,0xAA,0x60,0x56,0x58,0x3A,0x48,0xF3),
+               .a = chunk_from_chars(
+                       0x78,0x30,0xA3,0x31,0x8B,0x60,0x3B,0x89,0xE2,0x32,0x71,0x45,0xAC,0x23,0x4C,0xC5,
+                       0x94,0xCB,0xDD,0x8D,0x3D,0xF9,0x16,0x10,0xA8,0x34,0x41,0xCA,0xEA,0x98,0x63,0xBC,
+                       0x2D,0xED,0x5D,0x5A,0xA8,0x25,0x3A,0xA1,0x0A,0x2E,0xF1,0xC9,0x8B,0x9A,0xC8,0xB5,
+                       0x7F,0x11,0x17,0xA7,0x2B,0xF2,0xC7,0xB9,0xE7,0xC1,0xAC,0x4D,0x77,0xFC,0x94,0xCA),
+               .b = chunk_from_chars(
+                       0x3D,0xF9,0x16,0x10,0xA8,0x34,0x41,0xCA,0xEA,0x98,0x63,0xBC,0x2D,0xED,0x5D,0x5A,
+                       0xA8,0x25,0x3A,0xA1,0x0A,0x2E,0xF1,0xC9,0x8B,0x9A,0xC8,0xB5,0x7F,0x11,0x17,0xA7,
+                       0x2B,0xF2,0xC7,0xB9,0xE7,0xC1,0xAC,0x4D,0x77,0xFC,0x94,0xCA,0xDC,0x08,0x3E,0x67,
+                       0x98,0x40,0x50,0xB7,0x5E,0xBA,0xE5,0xDD,0x28,0x09,0xBD,0x63,0x80,0x16,0xF7,0x23),
+               .x = chunk_from_chars(
+                       0x81,0xAE,0xE4,0xBD,0xD8,0x2E,0xD9,0x64,0x5A,0x21,0x32,0x2E,0x9C,0x4C,0x6A,0x93,
+                       0x85,0xED,0x9F,0x70,0xB5,0xD9,0x16,0xC1,0xB4,0x3B,0x62,0xEE,0xF4,0xD0,0x09,0x8E,
+                       0xFF,0x3B,0x1F,0x78,0xE2,0xD0,0xD4,0x8D,0x50,0xD1,0x68,0x7B,0x93,0xB9,0x7D,0x5F,
+                       0x7C,0x6D,0x50,0x47,0x40,0x6A,0x5E,0x68,0x8B,0x35,0x22,0x09,0xBC,0xB9,0xF8,0x22),
+               .y = chunk_from_chars(
+                       0x7D,0xDE,0x38,0x5D,0x56,0x63,0x32,0xEC,0xC0,0xEA,0xBF,0xA9,0xCF,0x78,0x22,0xFD,
+                       0xF2,0x09,0xF7,0x00,0x24,0xA5,0x7B,0x1A,0xA0,0x00,0xC5,0x5B,0x88,0x1F,0x81,0x11,
+                       0xB2,0xDC,0xDE,0x49,0x4A,0x5F,0x48,0x5E,0x5B,0xCA,0x4B,0xD8,0x8A,0x27,0x63,0xAE,
+                       0xD1,0xCA,0x2B,0x2F,0xA8,0xF0,0x54,0x06,0x78,0xCD,0x1E,0x0F,0x3A,0xD8,0x08,0x92),
+               .q = chunk_from_chars(
+                       0xAA,0xDD,0x9D,0xB8,0xDB,0xE9,0xC4,0x8B,0x3F,0xD4,0xE6,0xAE,0x33,0xC9,0xFC,0x07,
+                       0xCB,0x30,0x8D,0xB3,0xB3,0xC9,0xD2,0x0E,0xD6,0x63,0x9C,0xCA,0x70,0x33,0x08,0x70,
+                       0x55,0x3E,0x5C,0x41,0x4C,0xA9,0x26,0x19,0x41,0x86,0x61,0x19,0x7F,0xAC,0x10,0x47,
+                       0x1D,0xB1,0xD3,0x81,0x08,0x5D,0xDA,0xDD,0xB5,0x87,0x96,0x82,0x9C,0xA9,0x00,0x69),
+       },
+};
+
+/**
+ * Create an EC_GROUP object for an ECC Brainpool curve
+ */
+EC_GROUP *ec_group_new_brainpool(bp_curve *curve)
+{
+       BIGNUM *p, *a, *b, *x, *y, *q;
+       const BIGNUM *h;
+       EC_POINT *G = NULL;
+       EC_GROUP *group = NULL, *result = NULL;
+       BN_CTX *ctx = NULL;
+
+       ctx = BN_CTX_new();
+       p = BN_bin2bn(curve->p.ptr, curve->p.len, NULL);
+       a = BN_bin2bn(curve->a.ptr, curve->a.len, NULL);
+       b = BN_bin2bn(curve->b.ptr, curve->b.len, NULL);
+       x = BN_bin2bn(curve->x.ptr, curve->x.len, NULL);
+       y = BN_bin2bn(curve->y.ptr, curve->y.len, NULL);
+       q = BN_bin2bn(curve->q.ptr, curve->q.len, NULL);
+       /* all supported groups have a cofactor of 1 */
+       h = BN_value_one();
+       if (!ctx || !p || !a || !b || !x || !y || !q)
+       {
+               goto failed;
+       }
+       group = EC_GROUP_new_curve_GFp(p, a, b, ctx);
+       if (!group)
+       {
+               goto failed;
+       }
+       G = EC_POINT_new(group);
+       if (!G || !EC_POINT_set_affine_coordinates_GFp(group, G, x, y, ctx))
+       {
+               goto failed;
+       }
+       if (!EC_GROUP_set_generator(group, G, q, h))
+       {
+               goto failed;
+       }
+       result = group;
+
+failed:
+       if (!result && group)
+       {
+               EC_GROUP_free(group);
+       }
+       if (G)
+       {
+               EC_POINT_free(G);
+       }
+       BN_CTX_free(ctx);
+       BN_free(p);
+       BN_free(a);
+       BN_free(b);
+       BN_free(x);
+       BN_free(y);
+       BN_free(q);
+       return result;
+}
+
+/**
+ * Create an EC_KEY for ECC Brainpool curves as defined above
+ */
+static EC_KEY *ec_key_new_brainpool(diffie_hellman_group_t group)
+{
+       bp_curve *curve = NULL;
+       EC_GROUP *ec_group;
+       EC_KEY *key = NULL;
+       int i;
+
+       for (i = 0; i < countof(bp_curves); i++)
+       {
+               if (bp_curves[i].group == group)
+               {
+                       curve = &bp_curves[i];
+               }
+       }
+       if (!curve)
+       {
+               return NULL;
+       }
+       ec_group = ec_group_new_brainpool(curve);
+       if (!ec_group)
+       {
+               return NULL;
+       }
+       key = EC_KEY_new();
+       if (!key || !EC_KEY_set_group(key, ec_group))
+       {
+               EC_KEY_free(key);
+               key = NULL;
+       }
+       EC_GROUP_free(ec_group);
+       return key;
+}
+
+#else /* !NID_brainpoolP224r1 || ... */
+
+/**
+ * Create an EC_KEY for ECC Brainpool curves as defined by OpenSSL
  */
 static EC_KEY *ec_key_new_brainpool(diffie_hellman_group_t group)
 {
        switch (group)
        {
-#ifdef NID_brainpoolP224r1
                case ECP_224_BP:
                        return EC_KEY_new_by_curve_name(NID_brainpoolP224r1);
-#endif
-#ifdef NID_brainpoolP256r1
                case ECP_256_BP:
                        return EC_KEY_new_by_curve_name(NID_brainpoolP256r1);
-#endif
-#ifdef NID_brainpoolP384r1
                case ECP_384_BP:
                        return EC_KEY_new_by_curve_name(NID_brainpoolP384r1);
-#endif
-#ifdef NID_brainpoolP512r1
                case ECP_512_BP:
                        return EC_KEY_new_by_curve_name(NID_brainpoolP512r1);
-#endif
                default:
                        return NULL;
        }
 }
 
+#endif /* !NID_brainpoolP224r1 || ... */
+
 /*
  * Described in header.
  */