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diff --git a/tests/sha224-256.c b/tests/sha224-256.c
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+/*
+RFC 6234                SHAs, HMAC-SHAs, and HKDF               May 2011
+
+
+Copyright Notice
+
+   Copyright (c) 2011 IETF Trust and the persons identified as the
+   document authors.  All rights reserved.
+
+   This document is subject to BCP 78 and the IETF Trust's Legal
+   Provisions Relating to IETF Documents
+   (http://trustee.ietf.org/license-info) in effect on the date of
+   publication of this document.  Please review these documents
+   carefully, as they describe your rights and restrictions with respect
+   to this document.  Code Components extracted from this document must
+   include Simplified BSD License text as described in Section 4.e of
+   the Trust Legal Provisions and are provided without warranty as
+   described in the Simplified BSD License.
+*/
+
+/************************* sha224-256.c ************************/
+/***************** See RFC 6234 for details. *******************/
+/* Copyright (c) 2011 IETF Trust and the persons identified as */
+/* authors of the code.  All rights reserved.                  */
+/* See sha.h for terms of use and redistribution.              */
+
+/*
+ * Description:
+ *   This file implements the Secure Hash Algorithms SHA-224 and
+ *   SHA-256 as defined in the U.S. National Institute of Standards
+ *   and Technology Federal Information Processing Standards
+ *   Publication (FIPS PUB) 180-3 published in October 2008
+ *   and formerly defined in its predecessors, FIPS PUB 180-1
+ *   and FIP PUB 180-2.
+ *
+ *   A combined document showing all algorithms is available at
+ *       http://csrc.nist.gov/publications/fips/
+ *              fips180-3/fips180-3_final.pdf
+ *
+ *   The SHA-224 and SHA-256 algorithms produce 224-bit and 256-bit
+ *   message digests for a given data stream.  It should take about
+ *   2**n steps to find a message with the same digest as a given
+ *   message and 2**(n/2) to find any two messages with the same
+ *   digest, when n is the digest size in bits.  Therefore, this
+ *   algorithm can serve as a means of providing a
+ *   "fingerprint" for a message.
+ *
+ * Portability Issues:
+ *   SHA-224 and SHA-256 are defined in terms of 32-bit "words".
+ *   This code uses <stdint.h> (included via "sha.h") to define 32-
+ *   and 8-bit unsigned integer types.  If your C compiler does not
+ *   support 32-bit unsigned integers, this code is not
+ *   appropriate.
+ *
+ * Caveats:
+ *   SHA-224 and SHA-256 are designed to work with messages less
+ *   than 2^64 bits long.  This implementation uses SHA224/256Input()
+ *   to hash the bits that are a multiple of the size of an 8-bit
+ *   octet, and then optionally uses SHA224/256FinalBits()
+ *   to hash the final few bits of the input.
+ */
+
+#include "tests/sha.h"
+#include "tests/sha-private.h"
+
+/* Define the SHA shift, rotate left, and rotate right macros */
+#define SHA256_SHR(bits,word)      ((word) >> (bits))
+#define SHA256_ROTL(bits,word)                         \
+  (((word) << (bits)) | ((word) >> (32-(bits))))
+#define SHA256_ROTR(bits,word)                         \
+  (((word) >> (bits)) | ((word) << (32-(bits))))
+
+/* Define the SHA SIGMA and sigma macros */
+#define SHA256_SIGMA0(word)   \
+  (SHA256_ROTR( 2,word) ^ SHA256_ROTR(13,word) ^ SHA256_ROTR(22,word))
+#define SHA256_SIGMA1(word)   \
+  (SHA256_ROTR( 6,word) ^ SHA256_ROTR(11,word) ^ SHA256_ROTR(25,word))
+#define SHA256_sigma0(word)   \
+  (SHA256_ROTR( 7,word) ^ SHA256_ROTR(18,word) ^ SHA256_SHR( 3,word))
+#define SHA256_sigma1(word)   \
+  (SHA256_ROTR(17,word) ^ SHA256_ROTR(19,word) ^ SHA256_SHR(10,word))
+
+/*
+ * Add "length" to the length.
+ * Set Corrupted when overflow has occurred.
+ */
+static uint32_t addTemp;
+#define SHA224_256AddLength(context, length)               \
+  (addTemp = (context)->Length_Low, (context)->Corrupted = \
+    (((context)->Length_Low += (length)) < addTemp) &&     \
+    (++(context)->Length_High == 0) ? shaInputTooLong :    \
+                                      (context)->Corrupted )
+
+/* Local Function Prototypes */
+static int SHA224_256Reset(SHA256Context *context, uint32_t *H0);
+static void SHA224_256ProcessMessageBlock(SHA256Context *context);
+static void SHA224_256Finalize(SHA256Context *context,
+  uint8_t Pad_Byte);
+static void SHA224_256PadMessage(SHA256Context *context,
+  uint8_t Pad_Byte);
+static int SHA224_256ResultN(SHA256Context *context,
+  uint8_t Message_Digest[ ], int HashSize);
+
+/* Initial Hash Values: FIPS 180-3 section 5.3.2 */
+static uint32_t SHA224_H0[SHA256HashSize/4] = {
+    0xC1059ED8, 0x367CD507, 0x3070DD17, 0xF70E5939,
+    0xFFC00B31, 0x68581511, 0x64F98FA7, 0xBEFA4FA4
+};
+
+/* Initial Hash Values: FIPS 180-3 section 5.3.3 */
+static uint32_t SHA256_H0[SHA256HashSize/4] = {
+  0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
+  0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
+};
+
+/*
+ * SHA224Reset
+ *
+ * Description:
+ *   This function will initialize the SHA224Context in preparation
+ *   for computing a new SHA224 message digest.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to reset.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int SHA224Reset(SHA224Context *context)
+{
+  return SHA224_256Reset(context, SHA224_H0);
+}
+
+/*
+ * SHA224Input
+ *
+ * Description:
+ *   This function accepts an array of octets as the next portion
+ *   of the message.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The SHA context to update.
+ *   message_array[ ]: [in]
+ *     An array of octets representing the next portion of
+ *     the message.
+ *   length: [in]
+ *     The length of the message in message_array.
+ *
+ * Returns:
+ *   sha Error Code.
+ *
+ */
+int SHA224Input(SHA224Context *context, const uint8_t *message_array,
+    unsigned int length)
+{
+  return SHA256Input(context, message_array, length);
+}
+
+/*
+ * SHA224FinalBits
+ *
+ * Description:
+ *   This function will add in any final bits of the message.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The SHA context to update.
+ *   message_bits: [in]
+ *     The final bits of the message, in the upper portion of the
+ *     byte.  (Use 0b###00000 instead of 0b00000### to input the
+ *     three bits ###.)
+ *   length: [in]
+ *     The number of bits in message_bits, between 1 and 7.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int SHA224FinalBits(SHA224Context *context,
+                    uint8_t message_bits, unsigned int length)
+{
+  return SHA256FinalBits(context, message_bits, length);
+}
+
+/*
+ * SHA224Result
+ *
+ * Description:
+ *   This function will return the 224-bit message digest
+ *   into the Message_Digest array provided by the caller.
+ *   NOTE:
+ *    The first octet of hash is stored in the element with index 0,
+ *    the last octet of hash in the element with index 27.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to use to calculate the SHA hash.
+ *   Message_Digest[ ]: [out]
+ *     Where the digest is returned.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int SHA224Result(SHA224Context *context,
+    uint8_t Message_Digest[SHA224HashSize])
+{
+  return SHA224_256ResultN(context, Message_Digest, SHA224HashSize);
+}
+
+/*
+ * SHA256Reset
+ *
+ * Description:
+ *   This function will initialize the SHA256Context in preparation
+ *   for computing a new SHA256 message digest.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to reset.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int SHA256Reset(SHA256Context *context)
+{
+  return SHA224_256Reset(context, SHA256_H0);
+}
+
+/*
+ * SHA256Input
+ *
+ * Description:
+ *   This function accepts an array of octets as the next portion
+ *   of the message.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The SHA context to update.
+ *   message_array[ ]: [in]
+ *     An array of octets representing the next portion of
+ *     the message.
+ *   length: [in]
+ *     The length of the message in message_array.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int SHA256Input(SHA256Context *context, const uint8_t *message_array,
+    unsigned int length)
+{
+  if (!context) return shaNull;
+  if (!length) return shaSuccess;
+  if (!message_array) return shaNull;
+  if (context->Computed) return context->Corrupted = shaStateError;
+  if (context->Corrupted) return context->Corrupted;
+
+  while (length--) {
+    context->Message_Block[context->Message_Block_Index++] =
+            *message_array;
+
+    if ((SHA224_256AddLength(context, 8) == shaSuccess) &&
+      (context->Message_Block_Index == SHA256_Message_Block_Size))
+      SHA224_256ProcessMessageBlock(context);
+
+    message_array++;
+  }
+
+  return context->Corrupted;
+
+}
+
+/*
+ * SHA256FinalBits
+ *
+ * Description:
+ *   This function will add in any final bits of the message.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The SHA context to update.
+ *   message_bits: [in]
+ *     The final bits of the message, in the upper portion of the
+ *     byte.  (Use 0b###00000 instead of 0b00000### to input the
+ *     three bits ###.)
+ *   length: [in]
+ *     The number of bits in message_bits, between 1 and 7.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int SHA256FinalBits(SHA256Context *context,
+                    uint8_t message_bits, unsigned int length)
+{
+  static uint8_t masks[8] = {
+      /* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
+      /* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
+      /* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
+      /* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
+  };
+  static uint8_t markbit[8] = {
+      /* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
+      /* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
+      /* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
+      /* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
+  };
+
+  if (!context) return shaNull;
+  if (!length) return shaSuccess;
+  if (context->Corrupted) return context->Corrupted;
+  if (context->Computed) return context->Corrupted = shaStateError;
+  if (length >= 8) return context->Corrupted = shaBadParam;
+
+  SHA224_256AddLength(context, length);
+  SHA224_256Finalize(context, (uint8_t)
+    ((message_bits & masks[length]) | markbit[length]));
+
+  return context->Corrupted;
+}
+
+/*
+ * SHA256Result
+ *
+ * Description:
+ *   This function will return the 256-bit message digest
+ *   into the Message_Digest array provided by the caller.
+ *   NOTE:
+ *    The first octet of hash is stored in the element with index 0,
+ *    the last octet of hash in the element with index 31.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to use to calculate the SHA hash.
+ *   Message_Digest[ ]: [out]
+ *     Where the digest is returned.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int SHA256Result(SHA256Context *context,
+                 uint8_t Message_Digest[SHA256HashSize])
+{
+  return SHA224_256ResultN(context, Message_Digest, SHA256HashSize);
+}
+
+/*
+ * SHA224_256Reset
+ *
+ * Description:
+ *   This helper function will initialize the SHA256Context in
+ *   preparation for computing a new SHA-224 or SHA-256 message digest.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to reset.
+ *   H0[ ]: [in]
+ *     The initial hash value array to use.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+static int SHA224_256Reset(SHA256Context *context, uint32_t *H0)
+{
+  if (!context) return shaNull;
+
+  context->Length_High = context->Length_Low = 0;
+  context->Message_Block_Index  = 0;
+
+  context->Intermediate_Hash[0] = H0[0];
+  context->Intermediate_Hash[1] = H0[1];
+  context->Intermediate_Hash[2] = H0[2];
+  context->Intermediate_Hash[3] = H0[3];
+  context->Intermediate_Hash[4] = H0[4];
+  context->Intermediate_Hash[5] = H0[5];
+  context->Intermediate_Hash[6] = H0[6];
+  context->Intermediate_Hash[7] = H0[7];
+
+  context->Computed  = 0;
+  context->Corrupted = shaSuccess;
+
+  return shaSuccess;
+}
+
+/*
+ * SHA224_256ProcessMessageBlock
+ *
+ * Description:
+ *   This helper function will process the next 512 bits of the
+ *   message stored in the Message_Block array.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The SHA context to update.
+ *
+ * Returns:
+ *   Nothing.
+ *
+ * Comments:
+ *   Many of the variable names in this code, especially the
+ *   single character names, were used because those were the
+ *   names used in the Secure Hash Standard.
+ */
+static void SHA224_256ProcessMessageBlock(SHA256Context *context)
+{
+  /* Constants defined in FIPS 180-3, section 4.2.2 */
+  static const uint32_t K[64] = {
+      0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
+      0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
+      0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
+      0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+      0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
+      0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
+      0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
+      0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+      0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
+      0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
+      0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
+      0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+      0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+  };
+  int        t, t4;                   /* Loop counter */
+  uint32_t   temp1, temp2;            /* Temporary word value */
+  uint32_t   W[64];                   /* Word sequence */
+  uint32_t   A, B, C, D, E, F, G, H;  /* Word buffers */
+
+  /*
+   * Initialize the first 16 words in the array W
+   */
+  for (t = t4 = 0; t < 16; t++, t4 += 4)
+    W[t] = (((uint32_t)context->Message_Block[t4]) << 24) |
+           (((uint32_t)context->Message_Block[t4 + 1]) << 16) |
+           (((uint32_t)context->Message_Block[t4 + 2]) << 8) |
+           (((uint32_t)context->Message_Block[t4 + 3]));
+
+  for (t = 16; t < 64; t++)
+    W[t] = SHA256_sigma1(W[t-2]) + W[t-7] +
+        SHA256_sigma0(W[t-15]) + W[t-16];
+
+  A = context->Intermediate_Hash[0];
+  B = context->Intermediate_Hash[1];
+  C = context->Intermediate_Hash[2];
+  D = context->Intermediate_Hash[3];
+  E = context->Intermediate_Hash[4];
+  F = context->Intermediate_Hash[5];
+  G = context->Intermediate_Hash[6];
+  H = context->Intermediate_Hash[7];
+
+  for (t = 0; t < 64; t++) {
+    temp1 = H + SHA256_SIGMA1(E) + SHA_Ch(E,F,G) + K[t] + W[t];
+    temp2 = SHA256_SIGMA0(A) + SHA_Maj(A,B,C);
+    H = G;
+    G = F;
+    F = E;
+    E = D + temp1;
+    D = C;
+    C = B;
+    B = A;
+    A = temp1 + temp2;
+  }
+
+  context->Intermediate_Hash[0] += A;
+  context->Intermediate_Hash[1] += B;
+  context->Intermediate_Hash[2] += C;
+  context->Intermediate_Hash[3] += D;
+  context->Intermediate_Hash[4] += E;
+  context->Intermediate_Hash[5] += F;
+  context->Intermediate_Hash[6] += G;
+  context->Intermediate_Hash[7] += H;
+
+  context->Message_Block_Index = 0;
+}
+
+/*
+ * SHA224_256Finalize
+ *
+ * Description:
+ *   This helper function finishes off the digest calculations.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The SHA context to update.
+ *   Pad_Byte: [in]
+ *     The last byte to add to the message block before the 0-padding
+ *     and length.  This will contain the last bits of the message
+ *     followed by another single bit.  If the message was an
+ *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+static void SHA224_256Finalize(SHA256Context *context,
+    uint8_t Pad_Byte)
+{
+  int i;
+  SHA224_256PadMessage(context, Pad_Byte);
+  /* message may be sensitive, so clear it out */
+  for (i = 0; i < SHA256_Message_Block_Size; ++i)
+    context->Message_Block[i] = 0;
+  context->Length_High = 0;     /* and clear length */
+  context->Length_Low = 0;
+  context->Computed = 1;
+}
+
+/*
+ * SHA224_256PadMessage
+ *
+ * Description:
+ *   According to the standard, the message must be padded to the next
+ *   even multiple of 512 bits.  The first padding bit must be a '1'.
+ *   The last 64 bits represent the length of the original message.
+ *   All bits in between should be 0.  This helper function will pad
+ *   the message according to those rules by filling the
+ *   Message_Block array accordingly.  When it returns, it can be
+ *   assumed that the message digest has been computed.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to pad.
+ *   Pad_Byte: [in]
+ *     The last byte to add to the message block before the 0-padding
+ *     and length.  This will contain the last bits of the message
+ *     followed by another single bit.  If the message was an
+ *     exact multiple of 8-bits long, Pad_Byte will be 0x80.
+ *
+ * Returns:
+ *   Nothing.
+ */
+static void SHA224_256PadMessage(SHA256Context *context,
+    uint8_t Pad_Byte)
+{
+  /*
+   * Check to see if the current message block is too small to hold
+   * the initial padding bits and length.  If so, we will pad the
+   * block, process it, and then continue padding into a second
+   * block.
+   */
+  if (context->Message_Block_Index >= (SHA256_Message_Block_Size-8)) {
+    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
+    while (context->Message_Block_Index < SHA256_Message_Block_Size)
+      context->Message_Block[context->Message_Block_Index++] = 0;
+    SHA224_256ProcessMessageBlock(context);
+  } else
+    context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
+
+  while (context->Message_Block_Index < (SHA256_Message_Block_Size-8))
+    context->Message_Block[context->Message_Block_Index++] = 0;
+
+  /*
+   * Store the message length as the last 8 octets
+   */
+  context->Message_Block[56] = (uint8_t)(context->Length_High >> 24);
+  context->Message_Block[57] = (uint8_t)(context->Length_High >> 16);
+  context->Message_Block[58] = (uint8_t)(context->Length_High >> 8);
+  context->Message_Block[59] = (uint8_t)(context->Length_High);
+  context->Message_Block[60] = (uint8_t)(context->Length_Low >> 24);
+  context->Message_Block[61] = (uint8_t)(context->Length_Low >> 16);
+  context->Message_Block[62] = (uint8_t)(context->Length_Low >> 8);
+  context->Message_Block[63] = (uint8_t)(context->Length_Low);
+
+  SHA224_256ProcessMessageBlock(context);
+}
+
+/*
+ * SHA224_256ResultN
+ *
+ * Description:
+ *   This helper function will return the 224-bit or 256-bit message
+ *   digest into the Message_Digest array provided by the caller.
+ *   NOTE:
+ *    The first octet of hash is stored in the element with index 0,
+ *    the last octet of hash in the element with index 27/31.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to use to calculate the SHA hash.
+ *   Message_Digest[ ]: [out]
+ *     Where the digest is returned.
+ *   HashSize: [in]
+ *     The size of the hash, either 28 or 32.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+static int SHA224_256ResultN(SHA256Context *context,
+    uint8_t Message_Digest[ ], int HashSize)
+{
+  int i;
+
+  if (!context) return shaNull;
+  if (!Message_Digest) return shaNull;
+  if (context->Corrupted) return context->Corrupted;
+
+  if (!context->Computed)
+    SHA224_256Finalize(context, 0x80);
+
+  for (i = 0; i < HashSize; ++i)
+    Message_Digest[i] = (uint8_t)
+      (context->Intermediate_Hash[i>>2] >> 8 * ( 3 - ( i & 0x03 ) ));
+
+  return shaSuccess;
+}