Import current sha2.c and sha2.h from OpenBSD.

These are not changed from their original state, the next commit will
re-apply the portable changes.

2 files changed, 274 insertions, 181 deletions

diff --git a/openbsd-compat/sha2.c b/openbsd-compat/sha2.c
index b55ea30ac..f16cf9cd0 100644
--- a/openbsd-compat/sha2.c
+++ b/openbsd-compat/sha2.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: sha2.c,v 1.11 2005/08/08 08:05:35 espie Exp   */
+/*      $OpenBSD: sha2.c,v 1.27 2019/06/07 22:56:36 dtucker Exp $       */
 
 /*
  * FILE:        sha2.c
@@ -34,22 +34,10 @@
  * $From: sha2.c,v 1.1 2001/11/08 00:01:51 adg Exp adg $
  */
 
-/* OPENBSD ORIGINAL: lib/libc/hash/sha2.c */
-
-#include "includes.h"
-
-#ifdef WITH_OPENSSL
-# include <openssl/opensslv.h>
-# if !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L)
-#  define _NEED_SHA2 1
-# endif
-#else
-# define _NEED_SHA2 1
-#endif
-
-#if defined(_NEED_SHA2) && !defined(HAVE_SHA256_UPDATE)
+#include <sys/types.h>
 
 #include <string.h>
+#include <sha2.h>
 
 /*
  * UNROLLED TRANSFORM LOOP NOTE:
@@ -64,15 +52,20 @@
  *   #define SHA2_UNROLL_TRANSFORM
  *
  */
+#ifndef SHA2_SMALL
+#if defined(__amd64__) || defined(__i386__)
+#define SHA2_UNROLL_TRANSFORM
+#endif
+#endif
 
-/*** SHA-256/384/512 Machine Architecture Definitions *****************/
+/*** SHA-224/256/384/512 Machine Architecture Definitions *****************/
 /*
  * BYTE_ORDER NOTE:
  *
  * Please make sure that your system defines BYTE_ORDER.  If your
  * architecture is little-endian, make sure it also defines
  * LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
- * equivalent.
+ * equivilent.
  *
  * If your system does not define the above, then you can do so by
  * hand like this:
@@ -98,8 +91,9 @@
 #endif
 
 
-/*** SHA-256/384/512 Various Length Definitions ***********************/
+/*** SHA-224/256/384/512 Various Length Definitions ***********************/
 /* NOTE: Most of these are in sha2.h */
+#define SHA224_SHORT_BLOCK_LENGTH       (SHA224_BLOCK_LENGTH - 8)
 #define SHA256_SHORT_BLOCK_LENGTH       (SHA256_BLOCK_LENGTH - 8)
 #define SHA384_SHORT_BLOCK_LENGTH       (SHA384_BLOCK_LENGTH - 16)
 #define SHA512_SHORT_BLOCK_LENGTH       (SHA512_BLOCK_LENGTH - 16)
@@ -152,22 +146,22 @@
  * Bit shifting and rotation (used by the six SHA-XYZ logical functions:
  *
  *   NOTE:  The naming of R and S appears backwards here (R is a SHIFT and
- *   S is a ROTATION) because the SHA-256/384/512 description document
+ *   S is a ROTATION) because the SHA-224/256/384/512 description document
  *   (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
  *   same "backwards" definition.
  */
-/* Shift-right (used in SHA-256, SHA-384, and SHA-512): */
+/* Shift-right (used in SHA-224, SHA-256, SHA-384, and SHA-512): */
 #define R(b,x)          ((x) >> (b))
-/* 32-bit Rotate-right (used in SHA-256): */
+/* 32-bit Rotate-right (used in SHA-224 and SHA-256): */
 #define S32(b,x)        (((x) >> (b)) | ((x) << (32 - (b))))
 /* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
 #define S64(b,x)        (((x) >> (b)) | ((x) << (64 - (b))))
 
-/* Two of six logical functions used in SHA-256, SHA-384, and SHA-512: */
+/* Two of six logical functions used in SHA-224, SHA-256, SHA-384, and SHA-512: */
 #define Ch(x,y,z)       (((x) & (y)) ^ ((~(x)) & (z)))
 #define Maj(x,y,z)      (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
 
-/* Four of six logical functions used in SHA-256: */
+/* Four of six logical functions used in SHA-224 and SHA-256: */
 #define Sigma0_256(x)   (S32(2,  (x)) ^ S32(13, (x)) ^ S32(22, (x)))
 #define Sigma1_256(x)   (S32(6,  (x)) ^ S32(11, (x)) ^ S32(25, (x)))
 #define sigma0_256(x)   (S32(7,  (x)) ^ S32(18, (x)) ^ R(3 ,   (x)))
@@ -181,8 +175,8 @@
 
 
 /*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
-/* Hash constant words K for SHA-256: */
-const static u_int32_t K256[64] = {
+/* Hash constant words K for SHA-224 and SHA-256: */
+static const u_int32_t K256[64] = {
         0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
         0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
         0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
@@ -202,7 +196,7 @@ const static u_int32_t K256[64] = {
 };
 
 /* Initial hash value H for SHA-256: */
-const static u_int32_t sha256_initial_hash_value[8] = {
+static const u_int32_t sha256_initial_hash_value[8] = {
         0x6a09e667UL,
         0xbb67ae85UL,
         0x3c6ef372UL,
@@ -214,7 +208,7 @@ const static u_int32_t sha256_initial_hash_value[8] = {
 };
 
 /* Hash constant words K for SHA-384 and SHA-512: */
-const static u_int64_t K512[80] = {
+static const u_int64_t K512[80] = {
         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
         0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
         0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
@@ -257,8 +251,33 @@ const static u_int64_t K512[80] = {
         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
 };
 
+/* Initial hash value H for SHA-512 */
+static const u_int64_t sha512_initial_hash_value[8] = {
+        0x6a09e667f3bcc908ULL,
+        0xbb67ae8584caa73bULL,
+        0x3c6ef372fe94f82bULL,
+        0xa54ff53a5f1d36f1ULL,
+        0x510e527fade682d1ULL,
+        0x9b05688c2b3e6c1fULL,
+        0x1f83d9abfb41bd6bULL,
+        0x5be0cd19137e2179ULL
+};
+
+#if !defined(SHA2_SMALL)
+/* Initial hash value H for SHA-224: */
+static const u_int32_t sha224_initial_hash_value[8] = {
+        0xc1059ed8UL,
+        0x367cd507UL,
+        0x3070dd17UL,
+        0xf70e5939UL,
+        0xffc00b31UL,
+        0x68581511UL,
+        0x64f98fa7UL,
+        0xbefa4fa4UL
+};
+
 /* Initial hash value H for SHA-384 */
-const static u_int64_t sha384_initial_hash_value[8] = {
+static const u_int64_t sha384_initial_hash_value[8] = {
         0xcbbb9d5dc1059ed8ULL,
         0x629a292a367cd507ULL,
         0x9159015a3070dd17ULL,
@@ -269,30 +288,65 @@ const static u_int64_t sha384_initial_hash_value[8] = {
         0x47b5481dbefa4fa4ULL
 };
 
-/* Initial hash value H for SHA-512 */
-const static u_int64_t sha512_initial_hash_value[8] = {
-        0x6a09e667f3bcc908ULL,
-        0xbb67ae8584caa73bULL,
-        0x3c6ef372fe94f82bULL,
-        0xa54ff53a5f1d36f1ULL,
-        0x510e527fade682d1ULL,
-        0x9b05688c2b3e6c1fULL,
-        0x1f83d9abfb41bd6bULL,
-        0x5be0cd19137e2179ULL
+/* Initial hash value H for SHA-512-256 */
+static const u_int64_t sha512_256_initial_hash_value[8] = {
+        0x22312194fc2bf72cULL,
+        0x9f555fa3c84c64c2ULL,
+        0x2393b86b6f53b151ULL,
+        0x963877195940eabdULL,
+        0x96283ee2a88effe3ULL,
+        0xbe5e1e2553863992ULL,
+        0x2b0199fc2c85b8aaULL,
+        0x0eb72ddc81c52ca2ULL
 };
 
+/*** SHA-224: *********************************************************/
+void
+SHA224Init(SHA2_CTX *context)
+{
+        memcpy(context->state.st32, sha224_initial_hash_value,
+            sizeof(sha224_initial_hash_value));
+        memset(context->buffer, 0, sizeof(context->buffer));
+        context->bitcount[0] = 0;
+}
+DEF_WEAK(SHA224Init);
+
+MAKE_CLONE(SHA224Transform, SHA256Transform);
+MAKE_CLONE(SHA224Update, SHA256Update);
+MAKE_CLONE(SHA224Pad, SHA256Pad);
+DEF_WEAK(SHA224Transform);
+DEF_WEAK(SHA224Update);
+DEF_WEAK(SHA224Pad);
+
+void
+SHA224Final(u_int8_t digest[SHA224_DIGEST_LENGTH], SHA2_CTX *context)
+{
+        SHA224Pad(context);
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+        int     i;
+
+        /* Convert TO host byte order */
+        for (i = 0; i < 7; i++)
+                BE_32_TO_8(digest + i * 4, context->state.st32[i]);
+#else
+        memcpy(digest, context->state.st32, SHA224_DIGEST_LENGTH);
+#endif
+        explicit_bzero(context, sizeof(*context));
+}
+DEF_WEAK(SHA224Final);
+#endif /* !defined(SHA2_SMALL) */
 
 /*** SHA-256: *********************************************************/
 void
-SHA256_Init(SHA256_CTX *context)
+SHA256Init(SHA2_CTX *context)
 {
-        if (context == NULL)
-                return;
-        memcpy(context->state, sha256_initial_hash_value,
+        memcpy(context->state.st32, sha256_initial_hash_value,
             sizeof(sha256_initial_hash_value));
         memset(context->buffer, 0, sizeof(context->buffer));
-        context->bitcount = 0;
+        context->bitcount[0] = 0;
 }
+DEF_WEAK(SHA256Init);
 
 #ifdef SHA2_UNROLL_TRANSFORM
 
@@ -320,7 +374,7 @@ SHA256_Init(SHA256_CTX *context)
 } while(0)
 
 void
-SHA256_Transform(u_int32_t state[8], const u_int8_t data[SHA256_BLOCK_LENGTH])
+SHA256Transform(u_int32_t state[8], const u_int8_t data[SHA256_BLOCK_LENGTH])
 {
         u_int32_t       a, b, c, d, e, f, g, h, s0, s1;
         u_int32_t       T1, W256[16];
@@ -378,7 +432,7 @@ SHA256_Transform(u_int32_t state[8], const u_int8_t data[SHA256_BLOCK_LENGTH])
 #else /* SHA2_UNROLL_TRANSFORM */
 
 void
-SHA256_Transform(u_int32_t state[8], const u_int8_t data[SHA256_BLOCK_LENGTH])
+SHA256Transform(u_int32_t state[8], const u_int8_t data[SHA256_BLOCK_LENGTH])
 {
         u_int32_t       a, b, c, d, e, f, g, h, s0, s1;
         u_int32_t       T1, T2, W256[16];
@@ -451,17 +505,18 @@ SHA256_Transform(u_int32_t state[8], const u_int8_t data[SHA256_BLOCK_LENGTH])
 }
 
 #endif /* SHA2_UNROLL_TRANSFORM */
+DEF_WEAK(SHA256Transform);
 
 void
-SHA256_Update(SHA256_CTX *context, const u_int8_t *data, size_t len)
+SHA256Update(SHA2_CTX *context, const u_int8_t *data, size_t len)
 {
-        size_t  freespace, usedspace;
+        u_int64_t       freespace, usedspace;
 
         /* Calling with no data is valid (we do nothing) */
         if (len == 0)
                 return;
 
-        usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
+        usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
         if (usedspace > 0) {
                 /* Calculate how much free space is available in the buffer */
                 freespace = SHA256_BLOCK_LENGTH - usedspace;
@@ -469,14 +524,14 @@ SHA256_Update(SHA256_CTX *context, const u_int8_t *data, size_t len)
                 if (len >= freespace) {
                         /* Fill the buffer completely and process it */
                         memcpy(&context->buffer[usedspace], data, freespace);
-                        context->bitcount += freespace << 3;
+                        context->bitcount[0] += freespace << 3;
                         len -= freespace;
                         data += freespace;
-                        SHA256_Transform(context->state, context->buffer);
+                        SHA256Transform(context->state.st32, context->buffer);
                 } else {
                         /* The buffer is not yet full */
                         memcpy(&context->buffer[usedspace], data, len);
-                        context->bitcount += len << 3;
+                        context->bitcount[0] += (u_int64_t)len << 3;
                         /* Clean up: */
                         usedspace = freespace = 0;
                         return;
@@ -484,26 +539,27 @@ SHA256_Update(SHA256_CTX *context, const u_int8_t *data, size_t len)
         }
         while (len >= SHA256_BLOCK_LENGTH) {
                 /* Process as many complete blocks as we can */
-                SHA256_Transform(context->state, data);
-                context->bitcount += SHA256_BLOCK_LENGTH << 3;
+                SHA256Transform(context->state.st32, data);
+                context->bitcount[0] += SHA256_BLOCK_LENGTH << 3;
                 len -= SHA256_BLOCK_LENGTH;
                 data += SHA256_BLOCK_LENGTH;
         }
         if (len > 0) {
                 /* There's left-overs, so save 'em */
                 memcpy(context->buffer, data, len);
-                context->bitcount += len << 3;
+                context->bitcount[0] += len << 3;
         }
         /* Clean up: */
         usedspace = freespace = 0;
 }
+DEF_WEAK(SHA256Update);
 
 void
-SHA256_Pad(SHA256_CTX *context)
+SHA256Pad(SHA2_CTX *context)
 {
         unsigned int    usedspace;
 
-        usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
+        usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
         if (usedspace > 0) {
                 /* Begin padding with a 1 bit: */
                 context->buffer[usedspace++] = 0x80;
@@ -518,7 +574,7 @@ SHA256_Pad(SHA256_CTX *context)
                                     SHA256_BLOCK_LENGTH - usedspace);
                         }
                         /* Do second-to-last transform: */
-                        SHA256_Transform(context->state, context->buffer);
+                        SHA256Transform(context->state.st32, context->buffer);
 
                         /* Prepare for last transform: */
                         memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
@@ -532,47 +588,45 @@ SHA256_Pad(SHA256_CTX *context)
         }
         /* Store the length of input data (in bits) in big endian format: */
         BE_64_TO_8(&context->buffer[SHA256_SHORT_BLOCK_LENGTH],
-            context->bitcount);
+            context->bitcount[0]);
 
         /* Final transform: */
-        SHA256_Transform(context->state, context->buffer);
+        SHA256Transform(context->state.st32, context->buffer);
 
         /* Clean up: */
         usedspace = 0;
 }
+DEF_WEAK(SHA256Pad);
 
 void
-SHA256_Final(u_int8_t digest[SHA256_DIGEST_LENGTH], SHA256_CTX *context)
+SHA256Final(u_int8_t digest[SHA256_DIGEST_LENGTH], SHA2_CTX *context)
 {
-        SHA256_Pad(context);
+        SHA256Pad(context);
 
-        /* If no digest buffer is passed, we don't bother doing this: */
-        if (digest != NULL) {
 #if BYTE_ORDER == LITTLE_ENDIAN
-                int     i;
+        int     i;
 
-                /* Convert TO host byte order */
-                for (i = 0; i < 8; i++)
-                        BE_32_TO_8(digest + i * 4, context->state[i]);
+        /* Convert TO host byte order */
+        for (i = 0; i < 8; i++)
+                BE_32_TO_8(digest + i * 4, context->state.st32[i]);
 #else
-                memcpy(digest, context->state, SHA256_DIGEST_LENGTH);
+        memcpy(digest, context->state.st32, SHA256_DIGEST_LENGTH);
 #endif
-                memset(context, 0, sizeof(*context));
-        }
+        explicit_bzero(context, sizeof(*context));
 }
+DEF_WEAK(SHA256Final);
 
 
 /*** SHA-512: *********************************************************/
 void
-SHA512_Init(SHA512_CTX *context)
+SHA512Init(SHA2_CTX *context)
 {
-        if (context == NULL)
-                return;
-        memcpy(context->state, sha512_initial_hash_value,
+        memcpy(context->state.st64, sha512_initial_hash_value,
             sizeof(sha512_initial_hash_value));
         memset(context->buffer, 0, sizeof(context->buffer));
         context->bitcount[0] = context->bitcount[1] =  0;
 }
+DEF_WEAK(SHA512Init);
 
 #ifdef SHA2_UNROLL_TRANSFORM
 
@@ -601,7 +655,7 @@ SHA512_Init(SHA512_CTX *context)
 } while(0)
 
 void
-SHA512_Transform(u_int64_t state[8], const u_int8_t data[SHA512_BLOCK_LENGTH])
+SHA512Transform(u_int64_t state[8], const u_int8_t data[SHA512_BLOCK_LENGTH])
 {
         u_int64_t       a, b, c, d, e, f, g, h, s0, s1;
         u_int64_t       T1, W512[16];
@@ -659,7 +713,7 @@ SHA512_Transform(u_int64_t state[8], const u_int8_t data[SHA512_BLOCK_LENGTH])
 #else /* SHA2_UNROLL_TRANSFORM */
 
 void
-SHA512_Transform(u_int64_t state[8], const u_int8_t data[SHA512_BLOCK_LENGTH])
+SHA512Transform(u_int64_t state[8], const u_int8_t data[SHA512_BLOCK_LENGTH])
 {
         u_int64_t       a, b, c, d, e, f, g, h, s0, s1;
         u_int64_t       T1, T2, W512[16];
@@ -732,9 +786,10 @@ SHA512_Transform(u_int64_t state[8], const u_int8_t data[SHA512_BLOCK_LENGTH])
 }
 
 #endif /* SHA2_UNROLL_TRANSFORM */
+DEF_WEAK(SHA512Transform);
 
 void
-SHA512_Update(SHA512_CTX *context, const u_int8_t *data, size_t len)
+SHA512Update(SHA2_CTX *context, const u_int8_t *data, size_t len)
 {
         size_t  freespace, usedspace;
 
@@ -753,7 +808,7 @@ SHA512_Update(SHA512_CTX *context, const u_int8_t *data, size_t len)
                         ADDINC128(context->bitcount, freespace << 3);
                         len -= freespace;
                         data += freespace;
-                        SHA512_Transform(context->state, context->buffer);
+                        SHA512Transform(context->state.st64, context->buffer);
                 } else {
                         /* The buffer is not yet full */
                         memcpy(&context->buffer[usedspace], data, len);
@@ -765,7 +820,7 @@ SHA512_Update(SHA512_CTX *context, const u_int8_t *data, size_t len)
         }
         while (len >= SHA512_BLOCK_LENGTH) {
                 /* Process as many complete blocks as we can */
-                SHA512_Transform(context->state, data);
+                SHA512Transform(context->state.st64, data);
                 ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
                 len -= SHA512_BLOCK_LENGTH;
                 data += SHA512_BLOCK_LENGTH;
@@ -778,9 +833,10 @@ SHA512_Update(SHA512_CTX *context, const u_int8_t *data, size_t len)
         /* Clean up: */
         usedspace = freespace = 0;
 }
+DEF_WEAK(SHA512Update);
 
 void
-SHA512_Pad(SHA512_CTX *context)
+SHA512Pad(SHA2_CTX *context)
 {
         unsigned int    usedspace;
 
@@ -797,7 +853,7 @@ SHA512_Pad(SHA512_CTX *context)
                                 memset(&context->buffer[usedspace], 0, SHA512_BLOCK_LENGTH - usedspace);
                         }
                         /* Do second-to-last transform: */
-                        SHA512_Transform(context->state, context->buffer);
+                        SHA512Transform(context->state.st64, context->buffer);
 
                         /* And set-up for the last transform: */
                         memset(context->buffer, 0, SHA512_BLOCK_LENGTH - 2);
@@ -816,89 +872,104 @@ SHA512_Pad(SHA512_CTX *context)
             context->bitcount[0]);
 
         /* Final transform: */
-        SHA512_Transform(context->state, context->buffer);
+        SHA512Transform(context->state.st64, context->buffer);
 
         /* Clean up: */
         usedspace = 0;
 }
+DEF_WEAK(SHA512Pad);
 
 void
-SHA512_Final(u_int8_t digest[SHA512_DIGEST_LENGTH], SHA512_CTX *context)
+SHA512Final(u_int8_t digest[SHA512_DIGEST_LENGTH], SHA2_CTX *context)
 {
-        SHA512_Pad(context);
+        SHA512Pad(context);
 
-        /* If no digest buffer is passed, we don't bother doing this: */
-        if (digest != NULL) {
 #if BYTE_ORDER == LITTLE_ENDIAN
-                int     i;
+        int     i;
 
-                /* Convert TO host byte order */
-                for (i = 0; i < 8; i++)
-                        BE_64_TO_8(digest + i * 8, context->state[i]);
+        /* Convert TO host byte order */
+        for (i = 0; i < 8; i++)
+                BE_64_TO_8(digest + i * 8, context->state.st64[i]);
 #else
-                memcpy(digest, context->state, SHA512_DIGEST_LENGTH);
+        memcpy(digest, context->state.st64, SHA512_DIGEST_LENGTH);
 #endif
-                memset(context, 0, sizeof(*context));
-        }
+        explicit_bzero(context, sizeof(*context));
 }
+DEF_WEAK(SHA512Final);
 
+#if !defined(SHA2_SMALL)
 
 /*** SHA-384: *********************************************************/
 void
-SHA384_Init(SHA384_CTX *context)
+SHA384Init(SHA2_CTX *context)
 {
-        if (context == NULL)
-                return;
-        memcpy(context->state, sha384_initial_hash_value,
+        memcpy(context->state.st64, sha384_initial_hash_value,
             sizeof(sha384_initial_hash_value));
         memset(context->buffer, 0, sizeof(context->buffer));
         context->bitcount[0] = context->bitcount[1] = 0;
 }
+DEF_WEAK(SHA384Init);
 
-#if 0
-__weak_alias(SHA384_Transform, SHA512_Transform);
-__weak_alias(SHA384_Update, SHA512_Update);
-__weak_alias(SHA384_Pad, SHA512_Pad);
-#endif
+MAKE_CLONE(SHA384Transform, SHA512Transform);
+MAKE_CLONE(SHA384Update, SHA512Update);
+MAKE_CLONE(SHA384Pad, SHA512Pad);
+DEF_WEAK(SHA384Transform);
+DEF_WEAK(SHA384Update);
+DEF_WEAK(SHA384Pad);
 
 void
-SHA384_Transform(u_int64_t state[8], const u_int8_t data[SHA512_BLOCK_LENGTH])
+SHA384Final(u_int8_t digest[SHA384_DIGEST_LENGTH], SHA2_CTX *context)
 {
-        return SHA512_Transform(state, data);
-}
+        SHA384Pad(context);
 
-void
-SHA384_Update(SHA512_CTX *context, const u_int8_t *data, size_t len)
-{
-        SHA512_Update(context, data, len);
+#if BYTE_ORDER == LITTLE_ENDIAN
+        int     i;
+
+        /* Convert TO host byte order */
+        for (i = 0; i < 6; i++)
+                BE_64_TO_8(digest + i * 8, context->state.st64[i]);
+#else
+        memcpy(digest, context->state.st64, SHA384_DIGEST_LENGTH);
+#endif
+        /* Zero out state data */
+        explicit_bzero(context, sizeof(*context));
 }
+DEF_WEAK(SHA384Final);
 
+/*** SHA-512/256: *********************************************************/
 void
-SHA384_Pad(SHA512_CTX *context)
+SHA512_256Init(SHA2_CTX *context)
 {
-        SHA512_Pad(context);
+        memcpy(context->state.st64, sha512_256_initial_hash_value,
+            sizeof(sha512_256_initial_hash_value));
+        memset(context->buffer, 0, sizeof(context->buffer));
+        context->bitcount[0] = context->bitcount[1] = 0;
 }
+DEF_WEAK(SHA512_256Init);
+
+MAKE_CLONE(SHA512_256Transform, SHA512Transform);
+MAKE_CLONE(SHA512_256Update, SHA512Update);
+MAKE_CLONE(SHA512_256Pad, SHA512Pad);
+DEF_WEAK(SHA512_256Transform);
+DEF_WEAK(SHA512_256Update);
+DEF_WEAK(SHA512_256Pad);
 
 void
-SHA384_Final(u_int8_t digest[SHA384_DIGEST_LENGTH], SHA384_CTX *context)
+SHA512_256Final(u_int8_t digest[SHA512_256_DIGEST_LENGTH], SHA2_CTX *context)
 {
-        SHA384_Pad(context);
+        SHA512_256Pad(context);
 
-        /* If no digest buffer is passed, we don't bother doing this: */
-        if (digest != NULL) {
 #if BYTE_ORDER == LITTLE_ENDIAN
-                int     i;
+        int     i;
 
-                /* Convert TO host byte order */
-                for (i = 0; i < 6; i++)
-                        BE_64_TO_8(digest + i * 8, context->state[i]);
+        /* Convert TO host byte order */
+        for (i = 0; i < 4; i++)
+                BE_64_TO_8(digest + i * 8, context->state.st64[i]);
 #else
-                memcpy(digest, context->state, SHA384_DIGEST_LENGTH);
+        memcpy(digest, context->state.st64, SHA512_256_DIGEST_LENGTH);
 #endif
-        }
-
         /* Zero out state data */
-        memset(context, 0, sizeof(*context));
+        explicit_bzero(context, sizeof(*context));
 }
-
-#endif /* defined(_NEED_SHA2) && !defined(HAVE_SHA256_UPDATE) */
+DEF_WEAK(SHA512_256Final);
+#endif /* !defined(SHA2_SMALL) */
diff --git a/openbsd-compat/sha2.h b/openbsd-compat/sha2.h
index c6e6c97a5..52ddb3f79 100644
--- a/openbsd-compat/sha2.h
+++ b/openbsd-compat/sha2.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: sha2.h,v 1.6 2004/06/22 01:57:30 jfb Exp      */
+/*      $OpenBSD: sha2.h,v 1.10 2016/09/03 17:00:29 tedu Exp $  */
 
 /*
  * FILE:        sha2.h
@@ -34,25 +34,14 @@
  * $From: sha2.h,v 1.1 2001/11/08 00:02:01 adg Exp adg $
  */
 
-/* OPENBSD ORIGINAL: include/sha2.h */
+#ifndef _SHA2_H
+#define _SHA2_H
 
-#ifndef _SSHSHA2_H
-#define _SSHSHA2_H
-
-#include "includes.h"
-
-#ifdef WITH_OPENSSL
-# include <openssl/opensslv.h>
-# if !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L)
-#  define _NEED_SHA2 1
-# endif
-#else
-# define _NEED_SHA2 1
-#endif
-
-#if defined(_NEED_SHA2) && !defined(HAVE_SHA256_UPDATE)
 
 /*** SHA-256/384/512 Various Length Definitions ***********************/
+#define SHA224_BLOCK_LENGTH             64
+#define SHA224_DIGEST_LENGTH            28
+#define SHA224_DIGEST_STRING_LENGTH     (SHA224_DIGEST_LENGTH * 2 + 1)
 #define SHA256_BLOCK_LENGTH             64
 #define SHA256_DIGEST_LENGTH            32
 #define SHA256_DIGEST_STRING_LENGTH     (SHA256_DIGEST_LENGTH * 2 + 1)
@@ -62,73 +51,106 @@
 #define SHA512_BLOCK_LENGTH             128
 #define SHA512_DIGEST_LENGTH            64
 #define SHA512_DIGEST_STRING_LENGTH     (SHA512_DIGEST_LENGTH * 2 + 1)
+#define SHA512_256_BLOCK_LENGTH         128
+#define SHA512_256_DIGEST_LENGTH        32
+#define SHA512_256_DIGEST_STRING_LENGTH (SHA512_256_DIGEST_LENGTH * 2 + 1)
 
 
-/*** SHA-256/384/512 Context Structures *******************************/
-typedef struct _SHA256_CTX {
-        u_int32_t       state[8];
-        u_int64_t       bitcount;
-        u_int8_t        buffer[SHA256_BLOCK_LENGTH];
-} SHA256_CTX;
-typedef struct _SHA512_CTX {
-        u_int64_t       state[8];
+/*** SHA-224/256/384/512 Context Structure *******************************/
+typedef struct _SHA2_CTX {
+        union {
+                u_int32_t       st32[8];
+                u_int64_t       st64[8];
+        } state;
         u_int64_t       bitcount[2];
         u_int8_t        buffer[SHA512_BLOCK_LENGTH];
-} SHA512_CTX;
+} SHA2_CTX;
 
-typedef SHA512_CTX SHA384_CTX;
+__BEGIN_DECLS
+void SHA224Init(SHA2_CTX *);
+void SHA224Transform(u_int32_t state[8], const u_int8_t [SHA224_BLOCK_LENGTH]);
+void SHA224Update(SHA2_CTX *, const u_int8_t *, size_t)
+        __attribute__((__bounded__(__string__,2,3)));
+void SHA224Pad(SHA2_CTX *);
+void SHA224Final(u_int8_t [SHA224_DIGEST_LENGTH], SHA2_CTX *)
+        __attribute__((__bounded__(__minbytes__,1,SHA224_DIGEST_LENGTH)));
+char *SHA224End(SHA2_CTX *, char *)
+        __attribute__((__bounded__(__minbytes__,2,SHA224_DIGEST_STRING_LENGTH)));
+char *SHA224File(const char *, char *)
+        __attribute__((__bounded__(__minbytes__,2,SHA224_DIGEST_STRING_LENGTH)));
+char *SHA224FileChunk(const char *, char *, off_t, off_t)
+        __attribute__((__bounded__(__minbytes__,2,SHA224_DIGEST_STRING_LENGTH)));
+char *SHA224Data(const u_int8_t *, size_t, char *)
+        __attribute__((__bounded__(__string__,1,2)))
+        __attribute__((__bounded__(__minbytes__,3,SHA224_DIGEST_STRING_LENGTH)));
 
-void SHA256_Init(SHA256_CTX *);
-void SHA256_Transform(u_int32_t state[8], const u_int8_t [SHA256_BLOCK_LENGTH]);
-void SHA256_Update(SHA256_CTX *, const u_int8_t *, size_t)
+void SHA256Init(SHA2_CTX *);
+void SHA256Transform(u_int32_t state[8], const u_int8_t [SHA256_BLOCK_LENGTH]);
+void SHA256Update(SHA2_CTX *, const u_int8_t *, size_t)
         __attribute__((__bounded__(__string__,2,3)));
-void SHA256_Pad(SHA256_CTX *);
-void SHA256_Final(u_int8_t [SHA256_DIGEST_LENGTH], SHA256_CTX *)
+void SHA256Pad(SHA2_CTX *);
+void SHA256Final(u_int8_t [SHA256_DIGEST_LENGTH], SHA2_CTX *)
         __attribute__((__bounded__(__minbytes__,1,SHA256_DIGEST_LENGTH)));
-char *SHA256_End(SHA256_CTX *, char *)
+char *SHA256End(SHA2_CTX *, char *)
         __attribute__((__bounded__(__minbytes__,2,SHA256_DIGEST_STRING_LENGTH)));
-char *SHA256_File(const char *, char *)
+char *SHA256File(const char *, char *)
         __attribute__((__bounded__(__minbytes__,2,SHA256_DIGEST_STRING_LENGTH)));
-char *SHA256_FileChunk(const char *, char *, off_t, off_t)
+char *SHA256FileChunk(const char *, char *, off_t, off_t)
         __attribute__((__bounded__(__minbytes__,2,SHA256_DIGEST_STRING_LENGTH)));
-char *SHA256_Data(const u_int8_t *, size_t, char *)
+char *SHA256Data(const u_int8_t *, size_t, char *)
         __attribute__((__bounded__(__string__,1,2)))
         __attribute__((__bounded__(__minbytes__,3,SHA256_DIGEST_STRING_LENGTH)));
 
-void SHA384_Init(SHA384_CTX *);
-void SHA384_Transform(u_int64_t state[8], const u_int8_t [SHA384_BLOCK_LENGTH]);
-void SHA384_Update(SHA384_CTX *, const u_int8_t *, size_t)
+void SHA384Init(SHA2_CTX *);
+void SHA384Transform(u_int64_t state[8], const u_int8_t [SHA384_BLOCK_LENGTH]);
+void SHA384Update(SHA2_CTX *, const u_int8_t *, size_t)
         __attribute__((__bounded__(__string__,2,3)));
-void SHA384_Pad(SHA384_CTX *);
-void SHA384_Final(u_int8_t [SHA384_DIGEST_LENGTH], SHA384_CTX *)
+void SHA384Pad(SHA2_CTX *);
+void SHA384Final(u_int8_t [SHA384_DIGEST_LENGTH], SHA2_CTX *)
         __attribute__((__bounded__(__minbytes__,1,SHA384_DIGEST_LENGTH)));
-char *SHA384_End(SHA384_CTX *, char *)
+char *SHA384End(SHA2_CTX *, char *)
         __attribute__((__bounded__(__minbytes__,2,SHA384_DIGEST_STRING_LENGTH)));
-char *SHA384_File(const char *, char *)
+char *SHA384File(const char *, char *)
         __attribute__((__bounded__(__minbytes__,2,SHA384_DIGEST_STRING_LENGTH)));
-char *SHA384_FileChunk(const char *, char *, off_t, off_t)
+char *SHA384FileChunk(const char *, char *, off_t, off_t)
         __attribute__((__bounded__(__minbytes__,2,SHA384_DIGEST_STRING_LENGTH)));
-char *SHA384_Data(const u_int8_t *, size_t, char *)
+char *SHA384Data(const u_int8_t *, size_t, char *)
         __attribute__((__bounded__(__string__,1,2)))
         __attribute__((__bounded__(__minbytes__,3,SHA384_DIGEST_STRING_LENGTH)));
 
-void SHA512_Init(SHA512_CTX *);
-void SHA512_Transform(u_int64_t state[8], const u_int8_t [SHA512_BLOCK_LENGTH]);
-void SHA512_Update(SHA512_CTX *, const u_int8_t *, size_t)
+void SHA512Init(SHA2_CTX *);
+void SHA512Transform(u_int64_t state[8], const u_int8_t [SHA512_BLOCK_LENGTH]);
+void SHA512Update(SHA2_CTX *, const u_int8_t *, size_t)
         __attribute__((__bounded__(__string__,2,3)));
-void SHA512_Pad(SHA512_CTX *);
-void SHA512_Final(u_int8_t [SHA512_DIGEST_LENGTH], SHA512_CTX *)
+void SHA512Pad(SHA2_CTX *);
+void SHA512Final(u_int8_t [SHA512_DIGEST_LENGTH], SHA2_CTX *)
         __attribute__((__bounded__(__minbytes__,1,SHA512_DIGEST_LENGTH)));
-char *SHA512_End(SHA512_CTX *, char *)
+char *SHA512End(SHA2_CTX *, char *)
         __attribute__((__bounded__(__minbytes__,2,SHA512_DIGEST_STRING_LENGTH)));
-char *SHA512_File(const char *, char *)
+char *SHA512File(const char *, char *)
         __attribute__((__bounded__(__minbytes__,2,SHA512_DIGEST_STRING_LENGTH)));
-char *SHA512_FileChunk(const char *, char *, off_t, off_t)
+char *SHA512FileChunk(const char *, char *, off_t, off_t)
         __attribute__((__bounded__(__minbytes__,2,SHA512_DIGEST_STRING_LENGTH)));
-char *SHA512_Data(const u_int8_t *, size_t, char *)
+char *SHA512Data(const u_int8_t *, size_t, char *)
         __attribute__((__bounded__(__string__,1,2)))
         __attribute__((__bounded__(__minbytes__,3,SHA512_DIGEST_STRING_LENGTH)));
 
-#endif /* defined(_NEED_SHA2) && !defined(HAVE_SHA256_UPDATE) */
+void SHA512_256Init(SHA2_CTX *);
+void SHA512_256Transform(u_int64_t state[8], const u_int8_t [SHA512_256_BLOCK_LENGTH]);
+void SHA512_256Update(SHA2_CTX *, const u_int8_t *, size_t)
+        __attribute__((__bounded__(__string__,2,3)));
+void SHA512_256Pad(SHA2_CTX *);
+void SHA512_256Final(u_int8_t [SHA512_256_DIGEST_LENGTH], SHA2_CTX *)
+        __attribute__((__bounded__(__minbytes__,1,SHA512_256_DIGEST_LENGTH)));
+char *SHA512_256End(SHA2_CTX *, char *)
+        __attribute__((__bounded__(__minbytes__,2,SHA512_256_DIGEST_STRING_LENGTH)));
+char *SHA512_256File(const char *, char *)
+        __attribute__((__bounded__(__minbytes__,2,SHA512_256_DIGEST_STRING_LENGTH)));
+char *SHA512_256FileChunk(const char *, char *, off_t, off_t)
+        __attribute__((__bounded__(__minbytes__,2,SHA512_256_DIGEST_STRING_LENGTH)));
+char *SHA512_256Data(const u_int8_t *, size_t, char *)
+        __attribute__((__bounded__(__string__,1,2)))
+        __attribute__((__bounded__(__minbytes__,3,SHA512_256_DIGEST_STRING_LENGTH)));
+__END_DECLS
 
-#endif /* _SSHSHA2_H */
+#endif /* _SHA2_H */