diff --git a/library/sha256.c b/library/sha256.c
new file mode 100644
index 0000000..e4d4842
--- /dev/null
+++ b/library/sha256.c
@@ -0,0 +1,705 @@
+/*
+ *  FIPS-180-2 compliant SHA-256 implementation
+ *
+ *  Copyright (C) 2006-2013, Brainspark B.V.
+ *
+ *  This file is part of PolarSSL (http://www.polarssl.org)
+ *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ *  All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+/*
+ *  The SHA-256 Secure Hash Standard was published by NIST in 2002.
+ *
+ *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
+ */
+
+#include "polarssl/config.h"
+
+#if defined(POLARSSL_SHA256_C)
+
+#include "polarssl/sha256.h"
+
+#if defined(POLARSSL_FS_IO) || defined(POLARSSL_SELF_TEST)
+#include <stdio.h>
+#endif
+
+#if !defined(POLARSSL_SHA256_ALT)
+
+/*
+ * 32-bit integer manipulation macros (big endian)
+ */
+#ifndef GET_UINT32_BE
+#define GET_UINT32_BE(n,b,i)                            \
+{                                                       \
+    (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
+        | ( (uint32_t) (b)[(i) + 1] << 16 )             \
+        | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
+        | ( (uint32_t) (b)[(i) + 3]       );            \
+}
+#endif
+
+#ifndef PUT_UINT32_BE
+#define PUT_UINT32_BE(n,b,i)                            \
+{                                                       \
+    (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
+    (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
+    (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
+    (b)[(i) + 3] = (unsigned char) ( (n)       );       \
+}
+#endif
+
+/*
+ * SHA-256 context setup
+ */
+void sha256_starts( sha256_context *ctx, int is224 )
+{
+    ctx->total[0] = 0;
+    ctx->total[1] = 0;
+
+    if( is224 == 0 )
+    {
+        /* SHA-256 */
+        ctx->state[0] = 0x6A09E667;
+        ctx->state[1] = 0xBB67AE85;
+        ctx->state[2] = 0x3C6EF372;
+        ctx->state[3] = 0xA54FF53A;
+        ctx->state[4] = 0x510E527F;
+        ctx->state[5] = 0x9B05688C;
+        ctx->state[6] = 0x1F83D9AB;
+        ctx->state[7] = 0x5BE0CD19;
+    }
+    else
+    {
+        /* SHA-224 */
+        ctx->state[0] = 0xC1059ED8;
+        ctx->state[1] = 0x367CD507;
+        ctx->state[2] = 0x3070DD17;
+        ctx->state[3] = 0xF70E5939;
+        ctx->state[4] = 0xFFC00B31;
+        ctx->state[5] = 0x68581511;
+        ctx->state[6] = 0x64F98FA7;
+        ctx->state[7] = 0xBEFA4FA4;
+    }
+
+    ctx->is224 = is224;
+}
+
+void sha256_process( sha256_context *ctx, const unsigned char data[64] )
+{
+    uint32_t temp1, temp2, W[64];
+    uint32_t A, B, C, D, E, F, G, H;
+
+    GET_UINT32_BE( W[ 0], data,  0 );
+    GET_UINT32_BE( W[ 1], data,  4 );
+    GET_UINT32_BE( W[ 2], data,  8 );
+    GET_UINT32_BE( W[ 3], data, 12 );
+    GET_UINT32_BE( W[ 4], data, 16 );
+    GET_UINT32_BE( W[ 5], data, 20 );
+    GET_UINT32_BE( W[ 6], data, 24 );
+    GET_UINT32_BE( W[ 7], data, 28 );
+    GET_UINT32_BE( W[ 8], data, 32 );
+    GET_UINT32_BE( W[ 9], data, 36 );
+    GET_UINT32_BE( W[10], data, 40 );
+    GET_UINT32_BE( W[11], data, 44 );
+    GET_UINT32_BE( W[12], data, 48 );
+    GET_UINT32_BE( W[13], data, 52 );
+    GET_UINT32_BE( W[14], data, 56 );
+    GET_UINT32_BE( W[15], data, 60 );
+
+#define  SHR(x,n) ((x & 0xFFFFFFFF) >> n)
+#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
+
+#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^  SHR(x, 3))
+#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^  SHR(x,10))
+
+#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
+#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
+
+#define F0(x,y,z) ((x & y) | (z & (x | y)))
+#define F1(x,y,z) (z ^ (x & (y ^ z)))
+
+#define R(t)                                    \
+(                                               \
+    W[t] = S1(W[t -  2]) + W[t -  7] +          \
+           S0(W[t - 15]) + W[t - 16]            \
+)
+
+#define P(a,b,c,d,e,f,g,h,x,K)                  \
+{                                               \
+    temp1 = h + S3(e) + F1(e,f,g) + K + x;      \
+    temp2 = S2(a) + F0(a,b,c);                  \
+    d += temp1; h = temp1 + temp2;              \
+}
+
+    A = ctx->state[0];
+    B = ctx->state[1];
+    C = ctx->state[2];
+    D = ctx->state[3];
+    E = ctx->state[4];
+    F = ctx->state[5];
+    G = ctx->state[6];
+    H = ctx->state[7];
+
+    P( A, B, C, D, E, F, G, H, W[ 0], 0x428A2F98 );
+    P( H, A, B, C, D, E, F, G, W[ 1], 0x71374491 );
+    P( G, H, A, B, C, D, E, F, W[ 2], 0xB5C0FBCF );
+    P( F, G, H, A, B, C, D, E, W[ 3], 0xE9B5DBA5 );
+    P( E, F, G, H, A, B, C, D, W[ 4], 0x3956C25B );
+    P( D, E, F, G, H, A, B, C, W[ 5], 0x59F111F1 );
+    P( C, D, E, F, G, H, A, B, W[ 6], 0x923F82A4 );
+    P( B, C, D, E, F, G, H, A, W[ 7], 0xAB1C5ED5 );
+    P( A, B, C, D, E, F, G, H, W[ 8], 0xD807AA98 );
+    P( H, A, B, C, D, E, F, G, W[ 9], 0x12835B01 );
+    P( G, H, A, B, C, D, E, F, W[10], 0x243185BE );
+    P( F, G, H, A, B, C, D, E, W[11], 0x550C7DC3 );
+    P( E, F, G, H, A, B, C, D, W[12], 0x72BE5D74 );
+    P( D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE );
+    P( C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7 );
+    P( B, C, D, E, F, G, H, A, W[15], 0xC19BF174 );
+    P( A, B, C, D, E, F, G, H, R(16), 0xE49B69C1 );
+    P( H, A, B, C, D, E, F, G, R(17), 0xEFBE4786 );
+    P( G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6 );
+    P( F, G, H, A, B, C, D, E, R(19), 0x240CA1CC );
+    P( E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F );
+    P( D, E, F, G, H, A, B, C, R(21), 0x4A7484AA );
+    P( C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC );
+    P( B, C, D, E, F, G, H, A, R(23), 0x76F988DA );
+    P( A, B, C, D, E, F, G, H, R(24), 0x983E5152 );
+    P( H, A, B, C, D, E, F, G, R(25), 0xA831C66D );
+    P( G, H, A, B, C, D, E, F, R(26), 0xB00327C8 );
+    P( F, G, H, A, B, C, D, E, R(27), 0xBF597FC7 );
+    P( E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3 );
+    P( D, E, F, G, H, A, B, C, R(29), 0xD5A79147 );
+    P( C, D, E, F, G, H, A, B, R(30), 0x06CA6351 );
+    P( B, C, D, E, F, G, H, A, R(31), 0x14292967 );
+    P( A, B, C, D, E, F, G, H, R(32), 0x27B70A85 );
+    P( H, A, B, C, D, E, F, G, R(33), 0x2E1B2138 );
+    P( G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC );
+    P( F, G, H, A, B, C, D, E, R(35), 0x53380D13 );
+    P( E, F, G, H, A, B, C, D, R(36), 0x650A7354 );
+    P( D, E, F, G, H, A, B, C, R(37), 0x766A0ABB );
+    P( C, D, E, F, G, H, A, B, R(38), 0x81C2C92E );
+    P( B, C, D, E, F, G, H, A, R(39), 0x92722C85 );
+    P( A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1 );
+    P( H, A, B, C, D, E, F, G, R(41), 0xA81A664B );
+    P( G, H, A, B, C, D, E, F, R(42), 0xC24B8B70 );
+    P( F, G, H, A, B, C, D, E, R(43), 0xC76C51A3 );
+    P( E, F, G, H, A, B, C, D, R(44), 0xD192E819 );
+    P( D, E, F, G, H, A, B, C, R(45), 0xD6990624 );
+    P( C, D, E, F, G, H, A, B, R(46), 0xF40E3585 );
+    P( B, C, D, E, F, G, H, A, R(47), 0x106AA070 );
+    P( A, B, C, D, E, F, G, H, R(48), 0x19A4C116 );
+    P( H, A, B, C, D, E, F, G, R(49), 0x1E376C08 );
+    P( G, H, A, B, C, D, E, F, R(50), 0x2748774C );
+    P( F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5 );
+    P( E, F, G, H, A, B, C, D, R(52), 0x391C0CB3 );
+    P( D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A );
+    P( C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F );
+    P( B, C, D, E, F, G, H, A, R(55), 0x682E6FF3 );
+    P( A, B, C, D, E, F, G, H, R(56), 0x748F82EE );
+    P( H, A, B, C, D, E, F, G, R(57), 0x78A5636F );
+    P( G, H, A, B, C, D, E, F, R(58), 0x84C87814 );
+    P( F, G, H, A, B, C, D, E, R(59), 0x8CC70208 );
+    P( E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA );
+    P( D, E, F, G, H, A, B, C, R(61), 0xA4506CEB );
+    P( C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7 );
+    P( B, C, D, E, F, G, H, A, R(63), 0xC67178F2 );
+
+    ctx->state[0] += A;
+    ctx->state[1] += B;
+    ctx->state[2] += C;
+    ctx->state[3] += D;
+    ctx->state[4] += E;
+    ctx->state[5] += F;
+    ctx->state[6] += G;
+    ctx->state[7] += H;
+}
+
+/*
+ * SHA-256 process buffer
+ */
+void sha256_update( sha256_context *ctx, const unsigned char *input, size_t ilen )
+{
+    size_t fill;
+    uint32_t left;
+
+    if( ilen <= 0 )
+        return;
+
+    left = ctx->total[0] & 0x3F;
+    fill = 64 - left;
+
+    ctx->total[0] += (uint32_t) ilen;
+    ctx->total[0] &= 0xFFFFFFFF;
+
+    if( ctx->total[0] < (uint32_t) ilen )
+        ctx->total[1]++;
+
+    if( left && ilen >= fill )
+    {
+        memcpy( (void *) (ctx->buffer + left), input, fill );
+        sha256_process( ctx, ctx->buffer );
+        input += fill;
+        ilen  -= fill;
+        left = 0;
+    }
+
+    while( ilen >= 64 )
+    {
+        sha256_process( ctx, input );
+        input += 64;
+        ilen  -= 64;
+    }
+
+    if( ilen > 0 )
+        memcpy( (void *) (ctx->buffer + left), input, ilen );
+}
+
+static const unsigned char sha256_padding[64] =
+{
+ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/*
+ * SHA-256 final digest
+ */
+void sha256_finish( sha256_context *ctx, unsigned char output[32] )
+{
+    uint32_t last, padn;
+    uint32_t high, low;
+    unsigned char msglen[8];
+
+    high = ( ctx->total[0] >> 29 )
+         | ( ctx->total[1] <<  3 );
+    low  = ( ctx->total[0] <<  3 );
+
+    PUT_UINT32_BE( high, msglen, 0 );
+    PUT_UINT32_BE( low,  msglen, 4 );
+
+    last = ctx->total[0] & 0x3F;
+    padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );
+
+    sha256_update( ctx, sha256_padding, padn );
+    sha256_update( ctx, msglen, 8 );
+
+    PUT_UINT32_BE( ctx->state[0], output,  0 );
+    PUT_UINT32_BE( ctx->state[1], output,  4 );
+    PUT_UINT32_BE( ctx->state[2], output,  8 );
+    PUT_UINT32_BE( ctx->state[3], output, 12 );
+    PUT_UINT32_BE( ctx->state[4], output, 16 );
+    PUT_UINT32_BE( ctx->state[5], output, 20 );
+    PUT_UINT32_BE( ctx->state[6], output, 24 );
+
+    if( ctx->is224 == 0 )
+        PUT_UINT32_BE( ctx->state[7], output, 28 );
+}
+
+#endif /* !POLARSSL_SHA256_ALT */
+
+/*
+ * output = SHA-256( input buffer )
+ */
+void sha256( const unsigned char *input, size_t ilen,
+             unsigned char output[32], int is224 )
+{
+    sha256_context ctx;
+
+    sha256_starts( &ctx, is224 );
+    sha256_update( &ctx, input, ilen );
+    sha256_finish( &ctx, output );
+
+    memset( &ctx, 0, sizeof( sha256_context ) );
+}
+
+#if defined(POLARSSL_FS_IO)
+/*
+ * output = SHA-256( file contents )
+ */
+int sha256_file( const char *path, unsigned char output[32], int is224 )
+{
+    FILE *f;
+    size_t n;
+    sha256_context ctx;
+    unsigned char buf[1024];
+
+    if( ( f = fopen( path, "rb" ) ) == NULL )
+        return( POLARSSL_ERR_SHA256_FILE_IO_ERROR );
+
+    sha256_starts( &ctx, is224 );
+
+    while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
+        sha256_update( &ctx, buf, n );
+
+    sha256_finish( &ctx, output );
+
+    memset( &ctx, 0, sizeof( sha256_context ) );
+
+    if( ferror( f ) != 0 )
+    {
+        fclose( f );
+        return( POLARSSL_ERR_SHA256_FILE_IO_ERROR );
+    }
+
+    fclose( f );
+    return( 0 );
+}
+#endif /* POLARSSL_FS_IO */
+
+/*
+ * SHA-256 HMAC context setup
+ */
+void sha256_hmac_starts( sha256_context *ctx, const unsigned char *key,
+                         size_t keylen, int is224 )
+{
+    size_t i;
+    unsigned char sum[32];
+
+    if( keylen > 64 )
+    {
+        sha256( key, keylen, sum, is224 );
+        keylen = ( is224 ) ? 28 : 32;
+        key = sum;
+    }
+
+    memset( ctx->ipad, 0x36, 64 );
+    memset( ctx->opad, 0x5C, 64 );
+
+    for( i = 0; i < keylen; i++ )
+    {
+        ctx->ipad[i] = (unsigned char)( ctx->ipad[i] ^ key[i] );
+        ctx->opad[i] = (unsigned char)( ctx->opad[i] ^ key[i] );
+    }
+
+    sha256_starts( ctx, is224 );
+    sha256_update( ctx, ctx->ipad, 64 );
+
+    memset( sum, 0, sizeof( sum ) );
+}
+
+/*
+ * SHA-256 HMAC process buffer
+ */
+void sha256_hmac_update( sha256_context *ctx, const unsigned char *input, size_t ilen )
+{
+    sha256_update( ctx, input, ilen );
+}
+
+/*
+ * SHA-256 HMAC final digest
+ */
+void sha256_hmac_finish( sha256_context *ctx, unsigned char output[32] )
+{
+    int is224, hlen;
+    unsigned char tmpbuf[32];
+
+    is224 = ctx->is224;
+    hlen = ( is224 == 0 ) ? 32 : 28;
+
+    sha256_finish( ctx, tmpbuf );
+    sha256_starts( ctx, is224 );
+    sha256_update( ctx, ctx->opad, 64 );
+    sha256_update( ctx, tmpbuf, hlen );
+    sha256_finish( ctx, output );
+
+    memset( tmpbuf, 0, sizeof( tmpbuf ) );
+}
+
+/*
+ * SHA-256 HMAC context reset
+ */
+void sha256_hmac_reset( sha256_context *ctx )
+{
+    sha256_starts( ctx, ctx->is224 );
+    sha256_update( ctx, ctx->ipad, 64 );
+}
+
+/*
+ * output = HMAC-SHA-256( hmac key, input buffer )
+ */
+void sha256_hmac( const unsigned char *key, size_t keylen,
+                  const unsigned char *input, size_t ilen,
+                  unsigned char output[32], int is224 )
+{
+    sha256_context ctx;
+
+    sha256_hmac_starts( &ctx, key, keylen, is224 );
+    sha256_hmac_update( &ctx, input, ilen );
+    sha256_hmac_finish( &ctx, output );
+
+    memset( &ctx, 0, sizeof( sha256_context ) );
+}
+
+#if defined(POLARSSL_SELF_TEST)
+/*
+ * FIPS-180-2 test vectors
+ */
+static unsigned char sha256_test_buf[3][57] = 
+{
+    { "abc" },
+    { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" },
+    { "" }
+};
+
+static const int sha256_test_buflen[3] =
+{
+    3, 56, 1000
+};
+
+static const unsigned char sha256_test_sum[6][32] =
+{
+    /*
+     * SHA-224 test vectors
+     */
+    { 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,
+      0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,
+      0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,
+      0xE3, 0x6C, 0x9D, 0xA7 },
+    { 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,
+      0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,
+      0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,
+      0x52, 0x52, 0x25, 0x25 },
+    { 0x20, 0x79, 0x46, 0x55, 0x98, 0x0C, 0x91, 0xD8,
+      0xBB, 0xB4, 0xC1, 0xEA, 0x97, 0x61, 0x8A, 0x4B,
+      0xF0, 0x3F, 0x42, 0x58, 0x19, 0x48, 0xB2, 0xEE,
+      0x4E, 0xE7, 0xAD, 0x67 },
+
+    /*
+     * SHA-256 test vectors
+     */
+    { 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA,
+      0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23,
+      0xB0, 0x03, 0x61, 0xA3, 0x96, 0x17, 0x7A, 0x9C,
+      0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD },
+    { 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8,
+      0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39,
+      0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67,
+      0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 },
+    { 0xCD, 0xC7, 0x6E, 0x5C, 0x99, 0x14, 0xFB, 0x92,
+      0x81, 0xA1, 0xC7, 0xE2, 0x84, 0xD7, 0x3E, 0x67,
+      0xF1, 0x80, 0x9A, 0x48, 0xA4, 0x97, 0x20, 0x0E,
+      0x04, 0x6D, 0x39, 0xCC, 0xC7, 0x11, 0x2C, 0xD0 }
+};
+
+/*
+ * RFC 4231 test vectors
+ */
+static unsigned char sha256_hmac_test_key[7][26] =
+{
+    { "\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B\x0B"
+      "\x0B\x0B\x0B\x0B" },
+    { "Jefe" },
+    { "\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA\xAA"
+      "\xAA\xAA\xAA\xAA" },
+    { "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0A\x0B\x0C\x0D\x0E\x0F\x10"
+      "\x11\x12\x13\x14\x15\x16\x17\x18\x19" },
+    { "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C"
+      "\x0C\x0C\x0C\x0C" },
+    { "" }, /* 0xAA 131 times */
+    { "" }
+};
+
+static const int sha256_hmac_test_keylen[7] =
+{
+    20, 4, 20, 25, 20, 131, 131
+};
+
+static unsigned char sha256_hmac_test_buf[7][153] =
+{
+    { "Hi There" },
+    { "what do ya want for nothing?" },
+    { "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
+      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
+      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
+      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD"
+      "\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD\xDD" },
+    { "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
+      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
+      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
+      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD"
+      "\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD\xCD" },
+    { "Test With Truncation" },
+    { "Test Using Larger Than Block-Size Key - Hash Key First" },
+    { "This is a test using a larger than block-size key "
+      "and a larger than block-size data. The key needs to "
+      "be hashed before being used by the HMAC algorithm." }
+};
+
+static const int sha256_hmac_test_buflen[7] =
+{
+    8, 28, 50, 50, 20, 54, 152
+};
+
+static const unsigned char sha256_hmac_test_sum[14][32] =
+{
+    /*
+     * HMAC-SHA-224 test vectors
+     */
+    { 0x89, 0x6F, 0xB1, 0x12, 0x8A, 0xBB, 0xDF, 0x19,
+      0x68, 0x32, 0x10, 0x7C, 0xD4, 0x9D, 0xF3, 0x3F,
+      0x47, 0xB4, 0xB1, 0x16, 0x99, 0x12, 0xBA, 0x4F,
+      0x53, 0x68, 0x4B, 0x22 },
+    { 0xA3, 0x0E, 0x01, 0x09, 0x8B, 0xC6, 0xDB, 0xBF,
+      0x45, 0x69, 0x0F, 0x3A, 0x7E, 0x9E, 0x6D, 0x0F,
+      0x8B, 0xBE, 0xA2, 0xA3, 0x9E, 0x61, 0x48, 0x00,
+      0x8F, 0xD0, 0x5E, 0x44 },
+    { 0x7F, 0xB3, 0xCB, 0x35, 0x88, 0xC6, 0xC1, 0xF6,
+      0xFF, 0xA9, 0x69, 0x4D, 0x7D, 0x6A, 0xD2, 0x64,
+      0x93, 0x65, 0xB0, 0xC1, 0xF6, 0x5D, 0x69, 0xD1,
+      0xEC, 0x83, 0x33, 0xEA },
+    { 0x6C, 0x11, 0x50, 0x68, 0x74, 0x01, 0x3C, 0xAC,
+      0x6A, 0x2A, 0xBC, 0x1B, 0xB3, 0x82, 0x62, 0x7C,
+      0xEC, 0x6A, 0x90, 0xD8, 0x6E, 0xFC, 0x01, 0x2D,
+      0xE7, 0xAF, 0xEC, 0x5A },
+    { 0x0E, 0x2A, 0xEA, 0x68, 0xA9, 0x0C, 0x8D, 0x37,
+      0xC9, 0x88, 0xBC, 0xDB, 0x9F, 0xCA, 0x6F, 0xA8 },
+    { 0x95, 0xE9, 0xA0, 0xDB, 0x96, 0x20, 0x95, 0xAD,
+      0xAE, 0xBE, 0x9B, 0x2D, 0x6F, 0x0D, 0xBC, 0xE2,
+      0xD4, 0x99, 0xF1, 0x12, 0xF2, 0xD2, 0xB7, 0x27,
+      0x3F, 0xA6, 0x87, 0x0E },
+    { 0x3A, 0x85, 0x41, 0x66, 0xAC, 0x5D, 0x9F, 0x02,
+      0x3F, 0x54, 0xD5, 0x17, 0xD0, 0xB3, 0x9D, 0xBD,
+      0x94, 0x67, 0x70, 0xDB, 0x9C, 0x2B, 0x95, 0xC9,
+      0xF6, 0xF5, 0x65, 0xD1 },
+
+    /*
+     * HMAC-SHA-256 test vectors
+     */
+    { 0xB0, 0x34, 0x4C, 0x61, 0xD8, 0xDB, 0x38, 0x53,
+      0x5C, 0xA8, 0xAF, 0xCE, 0xAF, 0x0B, 0xF1, 0x2B,
+      0x88, 0x1D, 0xC2, 0x00, 0xC9, 0x83, 0x3D, 0xA7,
+      0x26, 0xE9, 0x37, 0x6C, 0x2E, 0x32, 0xCF, 0xF7 },
+    { 0x5B, 0xDC, 0xC1, 0x46, 0xBF, 0x60, 0x75, 0x4E,
+      0x6A, 0x04, 0x24, 0x26, 0x08, 0x95, 0x75, 0xC7,
+      0x5A, 0x00, 0x3F, 0x08, 0x9D, 0x27, 0x39, 0x83,
+      0x9D, 0xEC, 0x58, 0xB9, 0x64, 0xEC, 0x38, 0x43 },
+    { 0x77, 0x3E, 0xA9, 0x1E, 0x36, 0x80, 0x0E, 0x46,
+      0x85, 0x4D, 0xB8, 0xEB, 0xD0, 0x91, 0x81, 0xA7,
+      0x29, 0x59, 0x09, 0x8B, 0x3E, 0xF8, 0xC1, 0x22,
+      0xD9, 0x63, 0x55, 0x14, 0xCE, 0xD5, 0x65, 0xFE },
+    { 0x82, 0x55, 0x8A, 0x38, 0x9A, 0x44, 0x3C, 0x0E,
+      0xA4, 0xCC, 0x81, 0x98, 0x99, 0xF2, 0x08, 0x3A,
+      0x85, 0xF0, 0xFA, 0xA3, 0xE5, 0x78, 0xF8, 0x07,
+      0x7A, 0x2E, 0x3F, 0xF4, 0x67, 0x29, 0x66, 0x5B },
+    { 0xA3, 0xB6, 0x16, 0x74, 0x73, 0x10, 0x0E, 0xE0,
+      0x6E, 0x0C, 0x79, 0x6C, 0x29, 0x55, 0x55, 0x2B },
+    { 0x60, 0xE4, 0x31, 0x59, 0x1E, 0xE0, 0xB6, 0x7F,
+      0x0D, 0x8A, 0x26, 0xAA, 0xCB, 0xF5, 0xB7, 0x7F,
+      0x8E, 0x0B, 0xC6, 0x21, 0x37, 0x28, 0xC5, 0x14,
+      0x05, 0x46, 0x04, 0x0F, 0x0E, 0xE3, 0x7F, 0x54 },
+    { 0x9B, 0x09, 0xFF, 0xA7, 0x1B, 0x94, 0x2F, 0xCB,
+      0x27, 0x63, 0x5F, 0xBC, 0xD5, 0xB0, 0xE9, 0x44,
+      0xBF, 0xDC, 0x63, 0x64, 0x4F, 0x07, 0x13, 0x93,
+      0x8A, 0x7F, 0x51, 0x53, 0x5C, 0x3A, 0x35, 0xE2 }
+};
+
+/*
+ * Checkup routine
+ */
+int sha256_self_test( int verbose )
+{
+    int i, j, k, buflen;
+    unsigned char buf[1024];
+    unsigned char sha256sum[32];
+    sha256_context ctx;
+
+    for( i = 0; i < 6; i++ )
+    {
+        j = i % 3;
+        k = i < 3;
+
+        if( verbose != 0 )
+            printf( "  SHA-%d test #%d: ", 256 - k * 32, j + 1 );
+
+        sha256_starts( &ctx, k );
+
+        if( j == 2 )
+        {
+            memset( buf, 'a', buflen = 1000 );
+
+            for( j = 0; j < 1000; j++ )
+                sha256_update( &ctx, buf, buflen );
+        }
+        else
+            sha256_update( &ctx, sha256_test_buf[j],
+                                 sha256_test_buflen[j] );
+
+        sha256_finish( &ctx, sha256sum );
+
+        if( memcmp( sha256sum, sha256_test_sum[i], 32 - k * 4 ) != 0 )
+        {
+            if( verbose != 0 )
+                printf( "failed\n" );
+
+            return( 1 );
+        }
+
+        if( verbose != 0 )
+            printf( "passed\n" );
+    }
+
+    if( verbose != 0 )
+        printf( "\n" );
+
+    for( i = 0; i < 14; i++ )
+    {
+        j = i % 7;
+        k = i < 7;
+
+        if( verbose != 0 )
+            printf( "  HMAC-SHA-%d test #%d: ", 256 - k * 32, j + 1 );
+
+        if( j == 5 || j == 6 )
+        {
+            memset( buf, '\xAA', buflen = 131 );
+            sha256_hmac_starts( &ctx, buf, buflen, k );
+        }
+        else
+            sha256_hmac_starts( &ctx, sha256_hmac_test_key[j],
+                                      sha256_hmac_test_keylen[j], k );
+
+        sha256_hmac_update( &ctx, sha256_hmac_test_buf[j],
+                                  sha256_hmac_test_buflen[j] );
+
+        sha256_hmac_finish( &ctx, sha256sum );
+
+        buflen = ( j == 4 ) ? 16 : 32 - k * 4;
+
+        if( memcmp( sha256sum, sha256_hmac_test_sum[i], buflen ) != 0 )
+        {
+            if( verbose != 0 )
+                printf( "failed\n" );
+
+            return( 1 );
+        }
+
+        if( verbose != 0 )
+            printf( "passed\n" );
+    }
+
+    if( verbose != 0 )
+        printf( "\n" );
+
+    return( 0 );
+}
+
+#endif
+
+#endif