Add JPAKE.

12 files changed, 941 insertions, 11 deletions

diff --git a/crypto/crypto.h b/crypto/crypto.h
index efde768937..ff09bc5fb4 100644
--- a/crypto/crypto.h
+++ b/crypto/crypto.h
@@ -366,6 +366,7 @@ int CRYPTO_is_mem_check_on(void);
 #define is_MemCheck_on() CRYPTO_is_mem_check_on()
 
 #define OPENSSL_malloc(num)	CRYPTO_malloc((int)num,__FILE__,__LINE__)
+#define OPENSSL_strdup(str)	CRYPTO_strdup((str),__FILE__,__LINE__)
 #define OPENSSL_realloc(addr,num) \
 	CRYPTO_realloc((char *)addr,(int)num,__FILE__,__LINE__)
 #define OPENSSL_realloc_clean(addr,old_num,num) \
@@ -489,6 +490,7 @@ void CRYPTO_get_mem_debug_functions(void (**m)(void *,int,const char *,int,int),
 void *CRYPTO_malloc_locked(int num, const char *file, int line);
 void CRYPTO_free_locked(void *);
 void *CRYPTO_malloc(int num, const char *file, int line);
+char *CRYPTO_strdup(const char *str, const char *file, int line);
 void CRYPTO_free(void *);
 void *CRYPTO_realloc(void *addr,int num, const char *file, int line);
 void *CRYPTO_realloc_clean(void *addr,int old_num,int num,const char *file,
diff --git a/crypto/err/Makefile b/crypto/err/Makefile
index 862b23ba17..3581d10178 100644
--- a/crypto/err/Makefile
+++ b/crypto/err/Makefile
@@ -90,17 +90,18 @@ err_all.o: ../../include/openssl/dso.h ../../include/openssl/e_os2.h
 err_all.o: ../../include/openssl/ec.h ../../include/openssl/ecdh.h
 err_all.o: ../../include/openssl/ecdsa.h ../../include/openssl/engine.h
 err_all.o: ../../include/openssl/err.h ../../include/openssl/evp.h
-err_all.o: ../../include/openssl/lhash.h ../../include/openssl/obj_mac.h
-err_all.o: ../../include/openssl/objects.h ../../include/openssl/ocsp.h
-err_all.o: ../../include/openssl/opensslconf.h ../../include/openssl/opensslv.h
-err_all.o: ../../include/openssl/ossl_typ.h ../../include/openssl/pem2.h
-err_all.o: ../../include/openssl/pkcs12.h ../../include/openssl/pkcs7.h
-err_all.o: ../../include/openssl/rand.h ../../include/openssl/rsa.h
-err_all.o: ../../include/openssl/safestack.h ../../include/openssl/sha.h
-err_all.o: ../../include/openssl/stack.h ../../include/openssl/symhacks.h
-err_all.o: ../../include/openssl/ts.h ../../include/openssl/ui.h
-err_all.o: ../../include/openssl/x509.h ../../include/openssl/x509_vfy.h
-err_all.o: ../../include/openssl/x509v3.h err_all.c
+err_all.o: ../../include/openssl/jpake.h ../../include/openssl/lhash.h
+err_all.o: ../../include/openssl/obj_mac.h ../../include/openssl/objects.h
+err_all.o: ../../include/openssl/ocsp.h ../../include/openssl/opensslconf.h
+err_all.o: ../../include/openssl/opensslv.h ../../include/openssl/ossl_typ.h
+err_all.o: ../../include/openssl/pem2.h ../../include/openssl/pkcs12.h
+err_all.o: ../../include/openssl/pkcs7.h ../../include/openssl/rand.h
+err_all.o: ../../include/openssl/rsa.h ../../include/openssl/safestack.h
+err_all.o: ../../include/openssl/sha.h ../../include/openssl/stack.h
+err_all.o: ../../include/openssl/symhacks.h ../../include/openssl/ts.h
+err_all.o: ../../include/openssl/ui.h ../../include/openssl/x509.h
+err_all.o: ../../include/openssl/x509_vfy.h ../../include/openssl/x509v3.h
+err_all.o: err_all.c
 err_prn.o: ../../e_os.h ../../include/openssl/bio.h
 err_prn.o: ../../include/openssl/buffer.h ../../include/openssl/crypto.h
 err_prn.o: ../../include/openssl/e_os2.h ../../include/openssl/err.h
diff --git a/crypto/err/err.h b/crypto/err/err.h
index 006351d5e3..b9f8c16d47 100644
--- a/crypto/err/err.h
+++ b/crypto/err/err.h
@@ -197,6 +197,7 @@ typedef struct err_state_st
 #define ERR_LIB_CMS		46
 #define ERR_LIB_TS		47
 #define ERR_LIB_HMAC		48
+#define ERR_LIB_JPAKE		49
 
 #define ERR_LIB_USER		128
 
@@ -232,6 +233,7 @@ typedef struct err_state_st
 #define CMSerr(f,r) ERR_PUT_error(ERR_LIB_CMS,(f),(r),__FILE__,__LINE__)
 #define TSerr(f,r) ERR_PUT_error(ERR_LIB_TS,(f),(r),__FILE__,__LINE__)
 #define HMACerr(f,r) ERR_PUT_error(ERR_LIB_HMAC,(f),(r),__FILE__,__LINE__)
+#define JPAKEerr(f,r) ERR_PUT_error(ERR_LIB_JPAKE,(f),(r),__FILE__,__LINE__)
 
 /* Borland C seems too stupid to be able to shift and do longs in
  * the pre-processor :-( */
diff --git a/crypto/err/err_all.c b/crypto/err/err_all.c
index f0a5e075ab..5ab89f9498 100644
--- a/crypto/err/err_all.c
+++ b/crypto/err/err_all.c
@@ -100,6 +100,8 @@
 #include <openssl/cms.h>
 #endif
 
+#include <openssl/jpake.h>
+
 void ERR_load_crypto_strings(void)
 	{
 #ifndef OPENSSL_NO_ERR
@@ -148,5 +150,6 @@ void ERR_load_crypto_strings(void)
 #ifndef OPENSSL_NO_CMS
 	ERR_load_CMS_strings();
 #endif
+	ERR_load_JPAKE_strings();
 #endif
 	}
diff --git a/crypto/err/openssl.ec b/crypto/err/openssl.ec
index c513734e94..e0554b4342 100644
--- a/crypto/err/openssl.ec
+++ b/crypto/err/openssl.ec
@@ -34,6 +34,7 @@ L STORE		crypto/store/store.h		crypto/store/str_err.c
 L TS		crypto/ts/ts.h			crypto/ts/ts_err.c
 L HMAC		crypto/hmac/hmac.h		crypto/hmac/hmac_err.c
 L CMS		crypto/cms/cms.h		crypto/cms/cms_err.c
+L JPAKE		crypto/jpake/jpake.h		crypto/jpake/jpake_err.c
 
 # additional header files to be scanned for function names
 L NONE		crypto/x509/x509_vfy.h		NONE
diff --git a/crypto/jpake/.cvsignore b/crypto/jpake/.cvsignore
new file mode 100644
index 0000000000..a65b41774a
--- /dev/null
+++ b/crypto/jpake/.cvsignore
@@ -0,0 +1 @@
+lib
diff --git a/crypto/jpake/Makefile b/crypto/jpake/Makefile
new file mode 100644
index 0000000000..d508c977a9
--- /dev/null
+++ b/crypto/jpake/Makefile
@@ -0,0 +1,49 @@
+DIR=jpake
+TOP=../..
+
+CFLAGS= $(INCLUDES) $(CFLAG)
+
+LIB=$(TOP)/libcrypto.a
+LIBOBJ=jpake.o jpake_err.o
+LIBSRC=jpake.c jpake_err.c
+
+EXHEADER=jpake.h
+TEST=jpaketest.c
+
+top:
+	(cd ../..; $(MAKE) DIRS=crypto SDIRS=$(DIR) sub_all)
+
+all:	lib
+
+lib:	$(LIBOBJ)
+	$(AR) $(LIB) $(LIBOBJ)
+	$(RANLIB) $(LIB) || echo Never mind.
+	@touch lib
+
+links:
+	@$(PERL) $(TOP)/util/mklink.pl ../../include/openssl $(EXHEADER)
+	@$(PERL) $(TOP)/util/mklink.pl ../../test $(TEST)
+
+depend:
+	@[ -n "$(MAKEDEPEND)" ] # should be set by upper Makefile...
+	$(MAKEDEPEND) -- $(CFLAG) $(INCLUDES) $(DEPFLAG) -- $(PROGS) $(LIBSRC)
+
+jpaketest: top jpaketest.c $(LIB)
+	$(CC) $(CFLAGS) -Wall -Werror -g -o jpaketest jpaketest.c $(LIB)
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+jpake.o: ../../include/openssl/bio.h ../../include/openssl/bn.h
+jpake.o: ../../include/openssl/crypto.h ../../include/openssl/e_os2.h
+jpake.o: ../../include/openssl/err.h ../../include/openssl/lhash.h
+jpake.o: ../../include/openssl/opensslconf.h ../../include/openssl/opensslv.h
+jpake.o: ../../include/openssl/ossl_typ.h ../../include/openssl/safestack.h
+jpake.o: ../../include/openssl/sha.h ../../include/openssl/stack.h
+jpake.o: ../../include/openssl/symhacks.h jpake.c jpake.h
+jpake_err.o: ../../include/openssl/bio.h ../../include/openssl/bn.h
+jpake_err.o: ../../include/openssl/crypto.h ../../include/openssl/e_os2.h
+jpake_err.o: ../../include/openssl/err.h ../../include/openssl/jpake.h
+jpake_err.o: ../../include/openssl/lhash.h ../../include/openssl/opensslconf.h
+jpake_err.o: ../../include/openssl/opensslv.h ../../include/openssl/ossl_typ.h
+jpake_err.o: ../../include/openssl/safestack.h ../../include/openssl/sha.h
+jpake_err.o: ../../include/openssl/stack.h ../../include/openssl/symhacks.h
+jpake_err.o: jpake_err.c
diff --git a/crypto/jpake/jpake.c b/crypto/jpake/jpake.c
new file mode 100644
index 0000000000..3ed1d1b158
--- /dev/null
+++ b/crypto/jpake/jpake.c
@@ -0,0 +1,468 @@
+#include "jpake.h"
+
+#include <openssl/crypto.h>
+#include <openssl/sha.h>
+#include <openssl/err.h>
+#include <memory.h>
+#include <assert.h>
+
+/*
+ * In the definition, (xa, xb, xc, xd) are Alice's (x1, x2, x3, x4) or
+ * Bob's (x3, x4, x1, x2). If you see what I mean.
+ */
+
+typedef struct
+    {
+    char *name;   // Must be unique
+    char *peer_name;
+    BIGNUM *p;
+    BIGNUM *g;
+    BIGNUM *q;
+    BIGNUM *gxc;  // Alice's g^{x3} or Bob's g^{x1}
+    BIGNUM *gxd;  // Alice's g^{x4} or Bob's g^{x2}
+    } JPAKE_CTX_PUBLIC;
+
+struct JPAKE_CTX
+    {
+    JPAKE_CTX_PUBLIC p;
+    BIGNUM *secret;    // The shared secret
+    BN_CTX *ctx;
+    BIGNUM *xa;        // Alice's x1 or Bob's x3
+    BIGNUM *xb;        // Alice's x2 or Bob's x4
+    BIGNUM *key;       // The calculated (shared) key
+    };
+
+static void JPAKE_ZKP_init(JPAKE_ZKP *zkp)
+    {
+    zkp->gr = BN_new();
+    zkp->b = BN_new();
+    }
+
+static void JPAKE_ZKP_release(JPAKE_ZKP *zkp)
+    {
+    BN_free(zkp->b);
+    BN_free(zkp->gr);
+    }
+
+// Two birds with one stone - make the global name as expected
+#define JPAKE_STEP_PART_init	JPAKE_STEP2_init
+#define JPAKE_STEP_PART_release	JPAKE_STEP2_release
+
+void JPAKE_STEP_PART_init(JPAKE_STEP_PART *p)
+    {
+    p->gx = BN_new();
+    JPAKE_ZKP_init(&p->zkpx);
+    }
+
+void JPAKE_STEP_PART_release(JPAKE_STEP_PART *p)
+    {
+    JPAKE_ZKP_release(&p->zkpx);
+    BN_free(p->gx);
+    }
+
+void JPAKE_STEP1_init(JPAKE_STEP1 *s1)
+    {
+    JPAKE_STEP_PART_init(&s1->p1);
+    JPAKE_STEP_PART_init(&s1->p2);
+    }
+
+void JPAKE_STEP1_release(JPAKE_STEP1 *s1)
+    {
+    JPAKE_STEP_PART_release(&s1->p2);
+    JPAKE_STEP_PART_release(&s1->p1);
+    }
+
+static void JPAKE_CTX_init(JPAKE_CTX *ctx, const char *name,
+			   const char *peer_name, const BIGNUM *p,
+			   const BIGNUM *g, const BIGNUM *q,
+			   const BIGNUM *secret)
+    {
+    ctx->p.name = OPENSSL_strdup(name);
+    ctx->p.peer_name = OPENSSL_strdup(peer_name);
+    ctx->p.p = BN_dup(p);
+    ctx->p.g = BN_dup(g);
+    ctx->p.q = BN_dup(q);
+    ctx->secret = BN_dup(secret);
+
+    ctx->p.gxc = BN_new();
+    ctx->p.gxd = BN_new();
+
+    ctx->xa = BN_new();
+    ctx->xb = BN_new();
+    ctx->key = BN_new();
+    ctx->ctx = BN_CTX_new();
+    }
+    
+static void JPAKE_CTX_release(JPAKE_CTX *ctx)
+    {
+    BN_CTX_free(ctx->ctx);
+    BN_clear_free(ctx->key);
+    BN_clear_free(ctx->xb);
+    BN_clear_free(ctx->xa);
+
+    BN_free(ctx->p.gxd);
+    BN_free(ctx->p.gxc);
+
+    BN_clear_free(ctx->secret);
+    BN_free(ctx->p.q);
+    BN_free(ctx->p.g);
+    BN_free(ctx->p.p);
+    OPENSSL_free(ctx->p.peer_name);
+    OPENSSL_free(ctx->p.name);
+
+    memset(ctx, '\0', sizeof *ctx);
+    }
+    
+JPAKE_CTX *JPAKE_CTX_new(const char *name, const char *peer_name,
+			 const BIGNUM *p, const BIGNUM *g, const BIGNUM *q,
+			 const BIGNUM *secret)
+    {
+    JPAKE_CTX *ctx = OPENSSL_malloc(sizeof *ctx);
+
+    JPAKE_CTX_init(ctx, name, peer_name, p, g, q, secret);
+
+    return ctx;
+    }
+
+void JPAKE_CTX_free(JPAKE_CTX *ctx)
+    {
+    JPAKE_CTX_release(ctx);
+    OPENSSL_free(ctx);
+    }
+
+static void hashlength(SHA_CTX *sha, size_t l)
+    {
+    unsigned char b[2];
+
+    assert(l <= 0xffff);
+    b[0] = l >> 8;
+    b[1] = l&0xff;
+    SHA1_Update(sha, b, 2);
+    }
+
+static void hashstring(SHA_CTX *sha, const char *string)
+    {
+    size_t l = strlen(string);
+
+    hashlength(sha, l);
+    SHA1_Update(sha, string, l);
+    }
+
+static void hashbn(SHA_CTX *sha, const BIGNUM *bn)
+    {
+    size_t l = BN_num_bytes(bn);
+    unsigned char *bin = alloca(l);
+
+    hashlength(sha, l);
+    BN_bn2bin(bn, bin);
+    SHA1_Update(sha, bin, l);
+    }
+
+// h=hash(g, g^r, g^x, name)
+static void zkp_hash(BIGNUM *h, const BIGNUM *zkpg, const JPAKE_STEP_PART *p,
+		     const char *proof_name)
+    {
+    unsigned char md[SHA_DIGEST_LENGTH];
+    SHA_CTX sha;
+
+    // XXX: hash should not allow moving of the boundaries - Java code
+    // is flawed in this respect. Length encoding seems simplest.
+    SHA1_Init(&sha);
+    hashbn(&sha, zkpg);
+    assert(!BN_is_zero(p->zkpx.gr));
+    hashbn(&sha, p->zkpx.gr);
+    hashbn(&sha, p->gx);
+    hashstring(&sha, proof_name);
+    SHA1_Final(md, &sha);
+    BN_bin2bn(md, SHA_DIGEST_LENGTH, h);
+    }
+
+// Prove knowledge of x
+// Note that p->gx has already been calculated
+static void generate_zkp(JPAKE_STEP_PART *p, const BIGNUM *x,
+			 const BIGNUM *zkpg, JPAKE_CTX *ctx)
+    {
+    BIGNUM *r = BN_new();
+    BIGNUM *h = BN_new();
+    BIGNUM *t = BN_new();
+
+    // r in [0,q)
+    // XXX: Java chooses r in [0, 2^160) - i.e. distribution not uniform
+    BN_rand_range(r, ctx->p.q);
+    // g^r
+    BN_mod_exp(p->zkpx.gr, zkpg, r, ctx->p.p, ctx->ctx);
+
+    // h=hash...
+    zkp_hash(h, zkpg, p, ctx->p.name);
+
+    // b = r - x*h
+    BN_mod_mul(t, x, h, ctx->p.q, ctx->ctx);
+    BN_mod_sub(p->zkpx.b, r, t, ctx->p.q, ctx->ctx);
+
+    // cleanup
+    BN_free(t);
+    BN_free(h);
+    BN_free(r);
+    }
+
+static int verify_zkp(const JPAKE_STEP_PART *p, const BIGNUM *zkpg,
+		      JPAKE_CTX *ctx)
+    {
+    BIGNUM *h = BN_new();
+    BIGNUM *t1 = BN_new();
+    BIGNUM *t2 = BN_new();
+    BIGNUM *t3 = BN_new();
+    int ret = 0;
+
+    zkp_hash(h, zkpg, p, ctx->p.peer_name);
+
+    // t1 = g^b
+    BN_mod_exp(t1, zkpg, p->zkpx.b, ctx->p.p, ctx->ctx);
+    // t2 = (g^x)^h = g^{hx}
+    BN_mod_exp(t2, p->gx, h, ctx->p.p, ctx->ctx);
+    // t3 = t1 * t2 = g^{hx} * g^b = g^{hx+b} = g^r (allegedly)
+    BN_mod_mul(t3, t1, t2, ctx->p.p, ctx->ctx);
+
+    // verify t3 == g^r
+    if(BN_cmp(t3, p->zkpx.gr) == 0)
+	ret = 1;
+    else
+	JPAKEerr(JPAKE_F_VERIFY_ZKP, JPAKE_R_ZKP_VERIFY_FAILED);
+
+    // cleanup
+    BN_free(t3);
+    BN_free(t2);
+    BN_free(t1);
+    BN_free(h);
+
+    return ret;
+    }    
+
+static void generate_step_part(JPAKE_STEP_PART *p, const BIGNUM *x,
+			       const BIGNUM *g, JPAKE_CTX *ctx)
+    {
+    BN_mod_exp(p->gx, g, x, ctx->p.p, ctx->ctx);
+    generate_zkp(p, x, g, ctx);
+    }
+
+// Generate each party's random numbers. xa is in [0, q), xb is in [1, q).
+static void genrand(JPAKE_CTX *ctx)
+    {
+    BIGNUM *qm1;
+
+    // xa in [0, q)
+    BN_rand_range(ctx->xa, ctx->p.q);
+
+    // q-1
+    qm1 = BN_new();
+    BN_copy(qm1, ctx->p.q);
+    BN_sub_word(qm1, 1);
+
+    // ... and xb in [0, q-1)
+    BN_rand_range(ctx->xb, qm1);
+    // [1, q)
+    BN_add_word(ctx->xb, 1);
+
+    // cleanup
+    BN_free(qm1);
+    }
+
+int JPAKE_STEP1_generate(JPAKE_STEP1 *send, JPAKE_CTX *ctx)
+    {
+    genrand(ctx);
+    generate_step_part(&send->p1, ctx->xa, ctx->p.g, ctx);
+    generate_step_part(&send->p2, ctx->xb, ctx->p.g, ctx);
+
+    return 1;
+    }
+
+int JPAKE_STEP1_process(JPAKE_CTX *ctx, const JPAKE_STEP1 *received)
+    {
+    // verify their ZKP(xc)
+    if(!verify_zkp(&received->p1, ctx->p.g, ctx))
+	{
+	JPAKEerr(JPAKE_F_JPAKE_STEP1_PROCESS, JPAKE_R_VERIFY_X3_FAILED);
+	return 0;
+	}
+
+    // verify their ZKP(xd)
+    if(!verify_zkp(&received->p2, ctx->p.g, ctx))
+	{
+	JPAKEerr(JPAKE_F_JPAKE_STEP1_PROCESS, JPAKE_R_VERIFY_X4_FAILED);
+	return 0;
+	}
+
+    // g^xd != 1
+    if(BN_is_one(received->p2.gx))
+	{
+	JPAKEerr(JPAKE_F_JPAKE_STEP1_PROCESS, JPAKE_R_G_TO_THE_X4_IS_ONE);
+	return 0;
+	}
+
+    // Save the bits we need for later
+    BN_copy(ctx->p.gxc, received->p1.gx);
+    BN_copy(ctx->p.gxd, received->p2.gx);
+
+    return 1;
+    }
+
+
+int JPAKE_STEP2_generate(JPAKE_STEP2 *send, JPAKE_CTX *ctx)
+    {
+    BIGNUM *t1 = BN_new();
+    BIGNUM *t2 = BN_new();
+
+    // X = g^{(xa + xc + xd) * xb * s}
+    // t1 = g^xa
+    BN_mod_exp(t1, ctx->p.g, ctx->xa, ctx->p.p, ctx->ctx);
+    // t2 = t1 * g^{xc} = g^{xa} * g^{xc} = g^{xa + xc}
+    BN_mod_mul(t2, t1, ctx->p.gxc, ctx->p.p, ctx->ctx);
+    // t1 = t2 * g^{xd} = g^{xa + xc + xd}
+    BN_mod_mul(t1, t2, ctx->p.gxd, ctx->p.p, ctx->ctx);
+    // t2 = xb * s
+    BN_mod_mul(t2, ctx->xb, ctx->secret, ctx->p.q, ctx->ctx);
+
+    // ZKP(xb * s)
+    // XXX: this is kinda funky, because we're using
+    //
+    // g' = g^{xa + xc + xd}
+    //
+    // as the generator, which means X is g'^{xb * s}
+    // X = t1^{t2} = t1^{xb * s} = g^{(xa + xc + xd) * xb * s}
+    generate_step_part(send, t2, t1, ctx);
+
+    // cleanup
+    BN_free(t1);
+    BN_free(t2);
+
+    return 1;
+    }
+
+// gx = g^{xc + xa + xb} * xd * s
+static int compute_key(JPAKE_CTX *ctx, const BIGNUM *gx)
+    {
+    BIGNUM *t1 = BN_new();
+    BIGNUM *t2 = BN_new();
+    BIGNUM *t3 = BN_new();
+
+    // K = (gx/g^{xb * xd * s})^{xb}
+    //   = (g^{(xc + xa + xb) * xd * s - xb * xd *s})^{xb}
+    //   = (g^{(xa + xc) * xd * s})^{xb}
+    //   = g^{(xa + xc) * xb * xd * s}
+    // [which is the same regardless of who calculates it]
+
+    // t1 = (g^{xd})^{xb} = g^{xb * xd}
+    BN_mod_exp(t1, ctx->p.gxd, ctx->xb, ctx->p.p, ctx->ctx);
+    // t2 = -s = q-s
+    BN_sub(t2, ctx->p.q, ctx->secret);
+    // t3 = t1^t2 = g^{-xb * xd * s}
+    BN_mod_exp(t3, t1, t2, ctx->p.p, ctx->ctx);
+    // t1 = gx * t3 = X/g^{xb * xd * s}
+    BN_mod_mul(t1, gx, t3, ctx->p.p, ctx->ctx);
+    // K = t1^{xb}
+    BN_mod_exp(ctx->key, t1, ctx->xb, ctx->p.p, ctx->ctx);
+
+    // cleanup
+    BN_free(t3);
+    BN_free(t2);
+    BN_free(t1);
+
+    return 1;
+    }
+
+int JPAKE_STEP2_process(JPAKE_CTX *ctx, const JPAKE_STEP2 *received)
+    {
+    BIGNUM *t1 = BN_new();
+    BIGNUM *t2 = BN_new();
+    int ret = 0;
+
+    // g' = g^{xc + xa + xb} [from our POV]
+    // t1 = xa + xb
+    BN_mod_add(t1, ctx->xa, ctx->xb, ctx->p.q, ctx->ctx);
+    // t2 = g^{t1} = g^{xa+xb}
+    BN_mod_exp(t2, ctx->p.g, t1, ctx->p.p, ctx->ctx);
+    // t1 = g^{xc} * t2 = g^{xc + xa + xb}
+    BN_mod_mul(t1, ctx->p.gxc, t2, ctx->p.p, ctx->ctx);
+
+    if(verify_zkp(received, t1, ctx))
+	ret = 1;
+    else
+	JPAKEerr(JPAKE_F_JPAKE_STEP2_PROCESS, JPAKE_R_VERIFY_B_FAILED);
+
+    compute_key(ctx, received->gx);
+
+    // cleanup
+    BN_free(t2);
+    BN_free(t1);
+
+    return ret;
+    }
+
+static void quickhashbn(unsigned char *md, const BIGNUM *bn)
+    {
+    SHA_CTX sha;
+
+    SHA1_Init(&sha);
+    hashbn(&sha, bn);
+    SHA1_Final(md, &sha);
+    }
+
+void JPAKE_STEP3A_init(JPAKE_STEP3A *s3a)
+    {}
+
+int JPAKE_STEP3A_generate(JPAKE_STEP3A *send, JPAKE_CTX *ctx)
+    {
+    quickhashbn(send->hhk, ctx->key);
+    SHA1(send->hhk, sizeof send->hhk, send->hhk);
+
+    return 1;
+    }
+
+int JPAKE_STEP3A_process(JPAKE_CTX *ctx, const JPAKE_STEP3A *received)
+    {
+    unsigned char hhk[SHA_DIGEST_LENGTH];
+
+    quickhashbn(hhk, ctx->key);
+    SHA1(hhk, sizeof hhk, hhk);
+    if(memcmp(hhk, received->hhk, sizeof hhk))
+	{
+	JPAKEerr(JPAKE_F_JPAKE_STEP3A_PROCESS, JPAKE_R_HASH_OF_HASH_OF_KEY_MISMATCH);
+	return 0;
+	}
+    return 1;
+    }
+
+void JPAKE_STEP3A_release(JPAKE_STEP3A *s3a)
+    {}
+
+void JPAKE_STEP3B_init(JPAKE_STEP3B *s3b)
+    {}
+
+int JPAKE_STEP3B_generate(JPAKE_STEP3B *send, JPAKE_CTX *ctx)
+    {
+    quickhashbn(send->hk, ctx->key);
+
+    return 1;
+    }
+
+int JPAKE_STEP3B_process(JPAKE_CTX *ctx, const JPAKE_STEP3B *received)
+    {
+    unsigned char hk[SHA_DIGEST_LENGTH];
+
+    quickhashbn(hk, ctx->key);
+    if(memcmp(hk, received->hk, sizeof hk))
+	{
+	JPAKEerr(JPAKE_F_JPAKE_STEP3B_PROCESS, JPAKE_R_HASH_OF_KEY_MISMATCH);
+	return 0;
+	}
+    return 1;
+    }
+
+void JPAKE_STEP3B_release(JPAKE_STEP3B *s3b)
+    {}
+
+const BIGNUM *JPAKE_get_shared_key(JPAKE_CTX *ctx)
+    {
+    return ctx->key;
+    }
+
diff --git a/crypto/jpake/jpake.h b/crypto/jpake/jpake.h
new file mode 100644
index 0000000000..4c67a24378
--- /dev/null
+++ b/crypto/jpake/jpake.h
@@ -0,0 +1,115 @@
+/*
+ * Implement J-PAKE, as described in
+ * http://grouper.ieee.org/groups/1363/Research/contributions/hao-ryan-2008.pdf
+ * 
+ * With hints from http://www.cl.cam.ac.uk/~fh240/software/JPAKE2.java.
+ */
+
+#ifndef HEADER_JPAKE_H
+#define HEADER_JPAKE_H
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+#include <openssl/bn.h>
+#include <openssl/sha.h>
+
+typedef struct JPAKE_CTX JPAKE_CTX;
+
+// Note that "g" in the ZKPs is not necessarily the J-PAKE g.
+typedef struct
+    {
+    BIGNUM *gr;  // g^r (r random)
+    BIGNUM *b;   // b = r - x*h, h=hash(g, g^r, g^x, name)
+    } JPAKE_ZKP;
+
+typedef struct
+    {
+    BIGNUM *gx;        // g^x in step 1, g^(xa + xc + xd) * xb * s in step 2
+    JPAKE_ZKP zkpx;    // ZKP(x) or ZKP(xb * s)
+    } JPAKE_STEP_PART;
+
+typedef struct
+    {
+    JPAKE_STEP_PART p1;    // g^x3, ZKP(x3) or g^x1, ZKP(x1)
+    JPAKE_STEP_PART p2;    // g^x4, ZKP(x4) or g^x2, ZKP(x2)
+    } JPAKE_STEP1;
+
+typedef JPAKE_STEP_PART JPAKE_STEP2;
+
+typedef struct
+    {
+    unsigned char hhk[SHA_DIGEST_LENGTH];
+    } JPAKE_STEP3A;
+
+typedef struct
+    {
+    unsigned char hk[SHA_DIGEST_LENGTH];
+    } JPAKE_STEP3B;
+
+// Parameters are copied
+JPAKE_CTX *JPAKE_CTX_new(const char *name, const char *peer_name,
+			 const BIGNUM *p, const BIGNUM *g, const BIGNUM *q,
+			 const BIGNUM *secret);
+void JPAKE_CTX_free(JPAKE_CTX *ctx);
+
+// Note that JPAKE_STEP1 can be used multiple times before release
+// without another init.
+void JPAKE_STEP1_init(JPAKE_STEP1 *s1);
+int JPAKE_STEP1_generate(JPAKE_STEP1 *send, JPAKE_CTX *ctx);
+int JPAKE_STEP1_process(JPAKE_CTX *ctx, const JPAKE_STEP1 *received);
+void JPAKE_STEP1_release(JPAKE_STEP1 *s1);
+
+// Note that JPAKE_STEP2 can be used multiple times before release
+// without another init.
+void JPAKE_STEP2_init(JPAKE_STEP2 *s2);
+int JPAKE_STEP2_generate(JPAKE_STEP2 *send, JPAKE_CTX *ctx);
+int JPAKE_STEP2_process(JPAKE_CTX *ctx, const JPAKE_STEP2 *received);
+void JPAKE_STEP2_release(JPAKE_STEP2 *s2);
+
+// Optionally verify the shared key. If the shared secrets do not
+// match, the two ends will disagree about the shared key, but
+// otherwise the protocol will succeed.
+void JPAKE_STEP3A_init(JPAKE_STEP3A *s3a);
+int JPAKE_STEP3A_generate(JPAKE_STEP3A *send, JPAKE_CTX *ctx);
+int JPAKE_STEP3A_process(JPAKE_CTX *ctx, const JPAKE_STEP3A *received);
+void JPAKE_STEP3A_release(JPAKE_STEP3A *s3a);
+
+void JPAKE_STEP3B_init(JPAKE_STEP3B *s3b);
+int JPAKE_STEP3B_generate(JPAKE_STEP3B *send, JPAKE_CTX *ctx);
+int JPAKE_STEP3B_process(JPAKE_CTX *ctx, const JPAKE_STEP3B *received);
+void JPAKE_STEP3B_release(JPAKE_STEP3B *s3b);
+
+// the return value belongs to the library and will be released when
+// ctx is released, and will change when a new handshake is performed.
+const BIGNUM *JPAKE_get_shared_key(JPAKE_CTX *ctx);
+
+/* BEGIN ERROR CODES */
+/* The following lines are auto generated by the script mkerr.pl. Any changes
+ * made after this point may be overwritten when the script is next run.
+ */
+void ERR_load_JPAKE_strings(void);
+
+/* Error codes for the JPAKE functions. */
+
+/* Function codes. */
+#define JPAKE_F_JPAKE_STEP1_PROCESS			 101
+#define JPAKE_F_JPAKE_STEP2_PROCESS			 102
+#define JPAKE_F_JPAKE_STEP3A_PROCESS			 103
+#define JPAKE_F_JPAKE_STEP3B_PROCESS			 104
+#define JPAKE_F_VERIFY_ZKP				 100
+
+/* Reason codes. */
+#define JPAKE_R_G_TO_THE_X4_IS_ONE			 105
+#define JPAKE_R_HASH_OF_HASH_OF_KEY_MISMATCH		 106
+#define JPAKE_R_HASH_OF_KEY_MISMATCH			 107
+#define JPAKE_R_VERIFY_B_FAILED				 102
+#define JPAKE_R_VERIFY_X3_FAILED			 103
+#define JPAKE_R_VERIFY_X4_FAILED			 104
+#define JPAKE_R_ZKP_VERIFY_FAILED			 100
+
+#ifdef  __cplusplus
+}
+#endif
+#endif
diff --git a/crypto/jpake/jpake_err.c b/crypto/jpake/jpake_err.c
new file mode 100644
index 0000000000..1b95067967
--- /dev/null
+++ b/crypto/jpake/jpake_err.c
@@ -0,0 +1,105 @@
+/* crypto/jpake/jpake_err.c */
+/* ====================================================================
+ * Copyright (c) 1999-2008 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+/* NOTE: this file was auto generated by the mkerr.pl script: any changes
+ * made to it will be overwritten when the script next updates this file,
+ * only reason strings will be preserved.
+ */
+
+#include <stdio.h>
+#include <openssl/err.h>
+#include <openssl/jpake.h>
+
+/* BEGIN ERROR CODES */
+#ifndef OPENSSL_NO_ERR
+
+#define ERR_FUNC(func) ERR_PACK(ERR_LIB_JPAKE,func,0)
+#define ERR_REASON(reason) ERR_PACK(ERR_LIB_JPAKE,0,reason)
+
+static ERR_STRING_DATA JPAKE_str_functs[]=
+	{
+{ERR_FUNC(JPAKE_F_JPAKE_STEP1_PROCESS),	"JPAKE_STEP1_process"},
+{ERR_FUNC(JPAKE_F_JPAKE_STEP2_PROCESS),	"JPAKE_STEP2_process"},
+{ERR_FUNC(JPAKE_F_JPAKE_STEP3A_PROCESS),	"JPAKE_STEP3A_process"},
+{ERR_FUNC(JPAKE_F_JPAKE_STEP3B_PROCESS),	"JPAKE_STEP3B_process"},
+{ERR_FUNC(JPAKE_F_VERIFY_ZKP),	"VERIFY_ZKP"},
+{0,NULL}
+	};
+
+static ERR_STRING_DATA JPAKE_str_reasons[]=
+	{
+{ERR_REASON(JPAKE_R_G_TO_THE_X4_IS_ONE)  ,"g to the x4 is one"},
+{ERR_REASON(JPAKE_R_HASH_OF_HASH_OF_KEY_MISMATCH),"hash of hash of key mismatch"},
+{ERR_REASON(JPAKE_R_HASH_OF_KEY_MISMATCH),"hash of key mismatch"},
+{ERR_REASON(JPAKE_R_VERIFY_B_FAILED)     ,"verify b failed"},
+{ERR_REASON(JPAKE_R_VERIFY_X3_FAILED)    ,"verify x3 failed"},
+{ERR_REASON(JPAKE_R_VERIFY_X4_FAILED)    ,"verify x4 failed"},
+{ERR_REASON(JPAKE_R_ZKP_VERIFY_FAILED)   ,"zkp verify failed"},
+{0,NULL}
+	};
+
+#endif
+
+void ERR_load_JPAKE_strings(void)
+	{
+#ifndef OPENSSL_NO_ERR
+
+	if (ERR_func_error_string(JPAKE_str_functs[0].error) == NULL)
+		{
+		ERR_load_strings(0,JPAKE_str_functs);
+		ERR_load_strings(0,JPAKE_str_reasons);
+		}
+#endif
+	}
diff --git a/crypto/jpake/jpaketest.c b/crypto/jpake/jpaketest.c
new file mode 100644
index 0000000000..13b2e1f119
--- /dev/null
+++ b/crypto/jpake/jpaketest.c
@@ -0,0 +1,176 @@
+#include <openssl/jpake.h>
+#include <openssl/err.h>
+
+static void showbn(const char *name, const BIGNUM *bn)
+    {
+    fputs(name, stdout);
+    fputs(" = ", stdout);
+    BN_print_fp(stdout, bn);
+    putc('\n', stdout);
+    }
+
+static int run_jpake(JPAKE_CTX *alice, JPAKE_CTX *bob)
+    {
+    JPAKE_STEP1 alice_s1;
+    JPAKE_STEP1 bob_s1;
+    JPAKE_STEP2 alice_s2;
+    JPAKE_STEP2 bob_s2;
+    JPAKE_STEP3A alice_s3a;
+    JPAKE_STEP3B bob_s3b;
+
+    // Alice -> Bob: step 1
+    puts("A->B s1");
+    JPAKE_STEP1_init(&alice_s1);
+    JPAKE_STEP1_generate(&alice_s1, alice);
+    if(!JPAKE_STEP1_process(bob, &alice_s1))
+	{
+	printf("Bob fails to process Alice's step 1\n");
+	ERR_print_errors_fp(stdout);
+	return 1;
+	}
+    JPAKE_STEP1_release(&alice_s1);
+
+    // Bob -> Alice: step 1
+    puts("B->A s1");
+    JPAKE_STEP1_init(&bob_s1);
+    JPAKE_STEP1_generate(&bob_s1, bob);
+    if(!JPAKE_STEP1_process(alice, &bob_s1))
+	{
+	printf("Alice fails to process Bob's step 1\n");
+	ERR_print_errors_fp(stdout);
+	return 2;
+	}
+    JPAKE_STEP1_release(&bob_s1);
+
+    // Alice -> Bob: step 2
+    puts("A->B s2");
+    JPAKE_STEP2_init(&alice_s2);
+    JPAKE_STEP2_generate(&alice_s2, alice);
+    if(!JPAKE_STEP2_process(bob, &alice_s2))
+	{
+	printf("Bob fails to process Alice's step 2\n");
+	ERR_print_errors_fp(stdout);
+	return 3;
+	}
+    JPAKE_STEP2_release(&alice_s2);
+
+    // Bob -> Alice: step 2
+    puts("B->A s2");
+    JPAKE_STEP2_init(&bob_s2);
+    JPAKE_STEP2_generate(&bob_s2, bob);
+    if(!JPAKE_STEP2_process(alice, &bob_s2))
+	{
+	printf("Alice fails to process Bob's step 2\n");
+	ERR_print_errors_fp(stdout);
+	return 4;
+	}
+    JPAKE_STEP2_release(&bob_s2);
+
+    showbn("Alice's key", JPAKE_get_shared_key(alice));
+    showbn("Bob's key  ", JPAKE_get_shared_key(bob));
+
+    // Alice -> Bob: step 3a
+    puts("A->B s3a");
+    JPAKE_STEP3A_init(&alice_s3a);
+    JPAKE_STEP3A_generate(&alice_s3a, alice);
+    if(!JPAKE_STEP3A_process(bob, &alice_s3a))
+	{
+	printf("Bob fails to process Alice's step 3a\n");
+	ERR_print_errors_fp(stdout);
+	return 5;
+	}
+    JPAKE_STEP3A_release(&alice_s3a);
+    
+    // Bob -> Alice: step 3b
+    puts("B->A s3b");
+    JPAKE_