implemented sha2_hasher which supports SHA-256, SHA-384 and SHA-512

7 files changed, 741 insertions, 50 deletions

diff --git a/src/libstrongswan/crypto/hashers/hasher.c b/src/libstrongswan/crypto/hashers/hasher.c
index f33f0018e..444486f9f 100644
--- a/src/libstrongswan/crypto/hashers/hasher.c
+++ b/src/libstrongswan/crypto/hashers/hasher.c
@@ -25,6 +25,7 @@
 #include "hasher.h"
 
 #include <crypto/hashers/sha1_hasher.h>
+#include <crypto/hashers/sha2_hasher.h>
 #include <crypto/hashers/md5_hasher.h>
 
 /**
@@ -51,6 +52,12 @@ hasher_t *hasher_create(hash_algorithm_t hash_algorithm)
 		{
 			return (hasher_t*)sha1_hasher_create();
 		}
+		case HASH_SHA256:
+		case HASH_SHA384:
+		case HASH_SHA512:
+		{
+			return (hasher_t*)sha2_hasher_create(hash_algorithm);
+		}
 		case HASH_MD5:
 		{
 			return (hasher_t*)md5_hasher_create();
diff --git a/src/libstrongswan/crypto/hashers/hasher.h b/src/libstrongswan/crypto/hashers/hasher.h
index 7111f5a9e..c92378abd 100644
--- a/src/libstrongswan/crypto/hashers/hasher.h
+++ b/src/libstrongswan/crypto/hashers/hasher.h
@@ -33,25 +33,26 @@ typedef enum hash_algorithm_t hash_algorithm_t;
 /**
  * @brief Algorithms to use for hashing.
  * 
- * Currently only the following algorithms are implemented and therefore supported:
+ * Currently only the following algorithms are implemented:
  * - HASH_MD5
  * - HASH_SHA1
- * 
+ * - HASH_SHA256
+ * - HASH_SHA384
+ * - HASH_SHA512
+ *
  * @ingroup hashers
- * 
  */
 enum hash_algorithm_t {
 	HASH_MD2,
-	/**
-	 * Implemented in class md5_hasher_t.
-	 */
+	/** Implemented in class md5_hasher_t */
 	HASH_MD5,
-	/**
-	 * Implemented in class sha1_hasher_t.
-	 */
+	/** Implemented in class sha1_hasher_t */
 	HASH_SHA1,
+	/** Implemented in class sha2_hasher_t */
 	HASH_SHA256,
+	/** Implemented in class sha2_hasher_t */
 	HASH_SHA384,
+	/** Implemented in class sha2_hasher_t */
 	HASH_SHA512,
 };
 
@@ -68,14 +69,6 @@ typedef struct hasher_t hasher_t;
  * 
  * @b Constructors:
  *  - hasher_create()
- *  - md5_hasher_create()
- *  - sha1_hasher_create()
- * 
- * @see		
- * 			- md5_hasher_t
- * 			- sha1_hasher_t
- * 
- * @todo Implement more hash algorithms
  * 
  * @ingroup hashers
  */
@@ -87,8 +80,8 @@ struct hasher_t {
 	 * an more data can be appended to already hashed data.
 	 * If not, the result is written back and the hasher is reseted.
 	 * 
-	 * @warning: the hash output parameter must hold at least
-	 * hash_t.get_block_size bytes.
+	 * The hash output parameter must hold at least
+	 * hash_t.get_block_size() bytes.
 	 * 
 	 * @param this			calling object
 	 * @param data			data to hash
@@ -118,8 +111,7 @@ struct hasher_t {
 	size_t (*get_hash_size) (hasher_t *this);
 	
 	/**
-	 * @brief Resets the hashers state, which allows
-	 * computation of a completely new hash.
+	 * @brief Resets the hashers state.
 	 * 
 	 * @param this			calling object
 	 */
@@ -145,4 +137,4 @@ struct hasher_t {
  */
 hasher_t *hasher_create(hash_algorithm_t hash_algorithm);
 
-#endif /*HASHER_H_*/
+#endif /* HASHER_H_ */
diff --git a/src/libstrongswan/crypto/hashers/sha2_hasher.c b/src/libstrongswan/crypto/hashers/sha2_hasher.c
new file mode 100644
index 000000000..b23357c1b
--- /dev/null
+++ b/src/libstrongswan/crypto/hashers/sha2_hasher.c
@@ -0,0 +1,643 @@
+/**
+ * @file sha2_hasher.c
+ * 
+ * @brief Implementation of hasher_sha_t.
+ * 
+ */
+
+/*
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ * 
+ * Ported from Steve Reid's <steve@edmweb.com> implementation
+ * "SHA1 in C" found in strongSwan.
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#include <string.h>
+
+#include "sha2_hasher.h"
+
+#include <definitions.h>
+
+#define HASH_SIZE_SHA256 32
+#define HASH_SIZE_SHA384 48
+#define HASH_SIZE_SHA512 64
+
+
+typedef struct private_sha512_hasher_t private_sha512_hasher_t;
+
+/**
+ * Private data structure with hasing context for SHA384 and SHA512
+ */
+struct private_sha512_hasher_t {
+	/**
+	 * Public interface for this hasher.
+	 */
+	sha2_hasher_t public;
+	
+	unsigned char   sha_out[128];   /* results are here, bytes 0..47/0..63 */
+	u_int64_t       sha_H[8];
+	u_int64_t       sha_blocks;
+	u_int64_t       sha_blocksMSB;
+	int             sha_bufCnt;
+};
+
+
+typedef struct private_sha256_hasher_t private_sha256_hasher_t;
+
+/**
+ * Private data structure with hasing context for SHA256
+ */
+struct private_sha256_hasher_t {
+	/**
+	 * Public interface for this hasher.
+	 */
+	sha2_hasher_t public;
+	
+	unsigned char   sha_out[64];    /* results are here, bytes 0...31 */
+	u_int32_t       sha_H[8];
+	u_int64_t       sha_blocks;
+	int             sha_bufCnt;
+};
+
+
+static const u_int32_t sha256_hashInit[8] = {
+	0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c,
+	0x1f83d9ab, 0x5be0cd19
+};
+
+static const u_int32_t sha256_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
+};
+
+static const u_int64_t sha512_hashInit[8] = {
+	0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL, 0x3c6ef372fe94f82bULL,
+	0xa54ff53a5f1d36f1ULL, 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
+	0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
+};
+
+static const u_int64_t sha384_hashInit[8] = {
+	0xcbbb9d5dc1059ed8ULL, 0x629a292a367cd507ULL, 0x9159015a3070dd17ULL,
+	0x152fecd8f70e5939ULL, 0x67332667ffc00b31ULL, 0x8eb44a8768581511ULL,
+	0xdb0c2e0d64f98fa7ULL, 0x47b5481dbefa4fa4ULL
+};
+
+static const u_int64_t sha512_K[80] = {
+	0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
+	0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
+	0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
+	0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
+	0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
+	0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
+	0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
+	0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
+	0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
+	0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
+	0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
+	0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
+	0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
+	0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
+	0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
+	0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
+	0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
+	0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
+	0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
+	0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
+	0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
+	0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
+	0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
+	0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
+	0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
+	0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
+	0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
+};
+
+
+/* set macros for SHA256 */
+#define Ch(x,y,z)   (((x) & (y)) ^ ((~(x)) & (z)))
+#define Maj(x,y,z)  (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+#define R(x,y)      ((y) >> (x))
+
+#define S(x,y)      (((y) >> (x)) | ((y) << (32 - (x))))
+#define uSig0(x)    ((S(2,(x))) ^ (S(13,(x))) ^ (S(22,(x))))
+#define uSig1(x)    ((S(6,(x))) ^ (S(11,(x))) ^ (S(25,(x))))
+#define lSig0(x)    ((S(7,(x))) ^ (S(18,(x))) ^ (R(3,(x))))
+#define lSig1(x)    ((S(17,(x))) ^ (S(19,(x))) ^ (R(10,(x))))
+
+/**
+ * Single block SHA256 transformation
+ */
+static void sha256_transform(private_sha256_hasher_t *ctx, 
+							 const unsigned char *datap)
+{
+	register int    j;
+	u_int32_t       a, b, c, d, e, f, g, h;
+	u_int32_t       T1, T2, W[64], Wm2, Wm15;
+
+	/* read the data, big endian byte order */
+	j = 0;
+	do {
+		W[j] = (((u_int32_t)(datap[0]))<<24) | (((u_int32_t)(datap[1]))<<16) |
+				(((u_int32_t)(datap[2]))<<8 ) | ((u_int32_t)(datap[3]));
+		datap += 4;
+	} while(++j < 16);
+
+	/* initialize variables a...h */
+	a = ctx->sha_H[0];
+	b = ctx->sha_H[1];
+	c = ctx->sha_H[2];
+	d = ctx->sha_H[3];
+	e = ctx->sha_H[4];
+	f = ctx->sha_H[5];
+	g = ctx->sha_H[6];
+	h = ctx->sha_H[7];
+
+	/* apply compression function */
+	j = 0;
+	do
+	{
+		if(j >= 16) 
+		{
+			Wm2 = W[j - 2];
+			Wm15 = W[j - 15];
+			W[j] = lSig1(Wm2) + W[j - 7] + lSig0(Wm15) + W[j - 16];
+		}
+		T1 = h + uSig1(e) + Ch(e,f,g) + sha256_K[j] + W[j];
+		T2 = uSig0(a) + Maj(a,b,c);
+		h = g; g = f; f = e;
+		e = d + T1;
+		d = c; c = b; b = a;
+		a = T1 + T2;
+	} while(++j < 64);
+
+	/* compute intermediate hash value */
+	ctx->sha_H[0] += a;
+	ctx->sha_H[1] += b;
+	ctx->sha_H[2] += c;
+	ctx->sha_H[3] += d;
+	ctx->sha_H[4] += e;
+	ctx->sha_H[5] += f;
+	ctx->sha_H[6] += g;
+	ctx->sha_H[7] += h;
+
+	ctx->sha_blocks++;
+}
+
+/**
+ * Update SHA256 hash
+ */
+static void sha256_write(private_sha256_hasher_t *ctx, 
+						 const unsigned char *datap, int length)
+{
+	while(length > 0)
+	{
+		if(!ctx->sha_bufCnt)
+		{
+			while(length >= sizeof(ctx->sha_out))
+			{
+				sha256_transform(ctx, datap);
+				datap += sizeof(ctx->sha_out);
+				length -= sizeof(ctx->sha_out);
+			}
+			if(!length) return;
+		}
+		ctx->sha_out[ctx->sha_bufCnt] = *datap++;
+		length--;
+		if(++ctx->sha_bufCnt == sizeof(ctx->sha_out))
+		{
+			sha256_transform(ctx, &ctx->sha_out[0]);
+			ctx->sha_bufCnt = 0;
+		}
+	}
+}
+
+/**
+ * finalize SHA256 hash
+ */
+static void sha256_final(private_sha256_hasher_t *ctx)
+{
+	register int    j;
+	u_int64_t       bitLength;
+	u_int32_t       i;
+	unsigned char   padByte, *datap;
+
+	bitLength = (ctx->sha_blocks << 9) | (ctx->sha_bufCnt << 3);
+	padByte = 0x80;
+	sha256_write(ctx, &padByte, 1);
+
+	/* pad extra space with zeroes */
+	padByte = 0;
+	while(ctx->sha_bufCnt != 56)
+	{
+		sha256_write(ctx, &padByte, 1);
+	}
+	
+	/* write bit length, big endian byte order */
+	ctx->sha_out[56] = bitLength >> 56;
+	ctx->sha_out[57] = bitLength >> 48;
+	ctx->sha_out[58] = bitLength >> 40;
+	ctx->sha_out[59] = bitLength >> 32;
+	ctx->sha_out[60] = bitLength >> 24;
+	ctx->sha_out[61] = bitLength >> 16;
+	ctx->sha_out[62] = bitLength >> 8;
+	ctx->sha_out[63] = bitLength;
+	sha256_transform(ctx, &ctx->sha_out[0]);
+	
+	/* return results in ctx->sha_out[0...31] */
+	datap = &ctx->sha_out[0];
+	j = 0;
+	do {
+		i = ctx->sha_H[j];
+		datap[0] = i >> 24;
+		datap[1] = i >> 16;
+		datap[2] = i >> 8;
+		datap[3] = i;
+		datap += 4;
+	} while(++j < 8);
+}
+
+/* update macros for SHA512 */
+#undef S
+#undef uSig0
+#undef uSig1
+#undef lSig0
+#undef lSig1
+#define S(x,y)      (((y) >> (x)) | ((y) << (64 - (x))))
+#define uSig0(x)    ((S(28,(x))) ^ (S(34,(x))) ^ (S(39,(x))))
+#define uSig1(x)    ((S(14,(x))) ^ (S(18,(x))) ^ (S(41,(x))))
+#define lSig0(x)    ((S(1,(x))) ^ (S(8,(x))) ^ (R(7,(x))))
+#define lSig1(x)    ((S(19,(x))) ^ (S(61,(x))) ^ (R(6,(x))))
+
+/**
+ * Single block SHA384/SHA512 transformation
+ */
+static void sha512_transform(private_sha512_hasher_t *ctx, 
+							 const unsigned char *datap)
+{
+	register int    j;
+	u_int64_t       a, b, c, d, e, f, g, h;
+	u_int64_t       T1, T2, W[80], Wm2, Wm15;
+
+	/* read the data, big endian byte order */
+	j = 0;
+	do {
+		W[j] = (((u_int64_t)(datap[0]))<<56) | (((u_int64_t)(datap[1]))<<48) |
+				(((u_int64_t)(datap[2]))<<40) | (((u_int64_t)(datap[3]))<<32) |
+				(((u_int64_t)(datap[4]))<<24) | (((u_int64_t)(datap[5]))<<16) |
+				(((u_int64_t)(datap[6]))<<8 ) | ((u_int64_t)(datap[7]));
+		datap += 8;
+	} while(++j < 16);
+
+	/* initialize variables a...h */
+	a = ctx->sha_H[0];
+	b = ctx->sha_H[1];
+	c = ctx->sha_H[2];
+	d = ctx->sha_H[3];
+	e = ctx->sha_H[4];
+	f = ctx->sha_H[5];
+	g = ctx->sha_H[6];
+	h = ctx->sha_H[7];
+
+	/* apply compression function */
+	j = 0;
+	do {
+		if(j >= 16) {
+			Wm2 = W[j - 2];
+			Wm15 = W[j - 15];
+			W[j] = lSig1(Wm2) + W[j - 7] + lSig0(Wm15) + W[j - 16];
+		}
+		T1 = h + uSig1(e) + Ch(e,f,g) + sha512_K[j] + W[j];
+		T2 = uSig0(a) + Maj(a,b,c);
+		h = g; g = f; f = e;
+		e = d + T1;
+		d = c; c = b; b = a;
+		a = T1 + T2;
+	} while(++j < 80);
+
+	/* compute intermediate hash value */
+	ctx->sha_H[0] += a;
+	ctx->sha_H[1] += b;
+	ctx->sha_H[2] += c;
+	ctx->sha_H[3] += d;
+	ctx->sha_H[4] += e;
+	ctx->sha_H[5] += f;
+	ctx->sha_H[6] += g;
+	ctx->sha_H[7] += h;
+
+	ctx->sha_blocks++;
+	if(!ctx->sha_blocks) ctx->sha_blocksMSB++;
+}
+
+/**
+ * Update a SHA384/SHA512 hash
+ */
+static void sha512_write(private_sha512_hasher_t *ctx, 
+						 const unsigned char *datap, int length)
+{
+	while(length > 0) 
+	{
+		if(!ctx->sha_bufCnt) 
+		{
+			while(length >= sizeof(ctx->sha_out)) 
+			{
+				sha512_transform(ctx, datap);
+				datap += sizeof(ctx->sha_out);
+				length -= sizeof(ctx->sha_out);
+			}
+			if(!length) return;
+		}
+		ctx->sha_out[ctx->sha_bufCnt] = *datap++;
+		length--;
+		if(++ctx->sha_bufCnt == sizeof(ctx->sha_out)) 
+		{
+			sha512_transform(ctx, &ctx->sha_out[0]);
+			ctx->sha_bufCnt = 0;
+		}
+	}
+}
+
+/**
+ * Finalize a SHA384/SHA512 hash
+ */
+static void sha512_final(private_sha512_hasher_t *ctx)
+{
+	register int    j;
+	u_int64_t       bitLength, bitLengthMSB;
+	u_int64_t       i;
+	unsigned char   padByte, *datap;
+
+	bitLength = (ctx->sha_blocks << 10) | (ctx->sha_bufCnt << 3);
+	bitLengthMSB = (ctx->sha_blocksMSB << 10) | (ctx->sha_blocks >> 54);
+	padByte = 0x80;
+	sha512_write(ctx, &padByte, 1);
+
+	/* pad extra space with zeroes */
+	padByte = 0;
+	while(ctx->sha_bufCnt != 112) 
+	{
+		sha512_write(ctx, &padByte, 1);
+	}
+
+	/* write bit length, big endian byte order */
+	ctx->sha_out[112] = bitLengthMSB >> 56;
+	ctx->sha_out[113] = bitLengthMSB >> 48;
+	ctx->sha_out[114] = bitLengthMSB >> 40;
+	ctx->sha_out[115] = bitLengthMSB >> 32;
+	ctx->sha_out[116] = bitLengthMSB >> 24;
+	ctx->sha_out[117] = bitLengthMSB >> 16;
+	ctx->sha_out[118] = bitLengthMSB >> 8;
+	ctx->sha_out[119] = bitLengthMSB;
+	ctx->sha_out[120] = bitLength >> 56;
+	ctx->sha_out[121] = bitLength >> 48;
+	ctx->sha_out[122] = bitLength >> 40;
+	ctx->sha_out[123] = bitLength >> 32;
+	ctx->sha_out[124] = bitLength >> 24;
+	ctx->sha_out[125] = bitLength >> 16;
+	ctx->sha_out[126] = bitLength >> 8;
+	ctx->sha_out[127] = bitLength;
+	sha512_transform(ctx, &ctx->sha_out[0]);
+	
+	/* return results in ctx->sha_out[0...63] */
+	datap = &ctx->sha_out[0];
+	j = 0;
+	do {
+		i = ctx->sha_H[j];
+		datap[0] = i >> 56;
+		datap[1] = i >> 48;
+		datap[2] = i >> 40;
+		datap[3] = i >> 32;
+		datap[4] = i >> 24;
+		datap[5] = i >> 16;
+		datap[6] = i >> 8;
+		datap[7] = i;
+		datap += 8;
+	} while(++j < 8);
+}
+
+/**
+ * Implementation of hasher_t.get_hash for SHA256.
+ */
+static void get_hash256(private_sha256_hasher_t *this, 
+						chunk_t chunk, u_int8_t *buffer)
+{
+	sha256_write(this, chunk.ptr, chunk.len);
+	if (buffer != NULL)
+	{
+		sha256_final(this);
+		memcpy(buffer, this->sha_out, HASH_SIZE_SHA256);
+		this->public.hasher_interface.reset(&(this->public.hasher_interface));
+	}
+}
+
+/**
+ * Implementation of hasher_t.get_hash for SHA384.
+ */
+static void get_hash384(private_sha512_hasher_t *this,
+						chunk_t chunk, u_int8_t *buffer)
+{
+	sha512_write(this, chunk.ptr, chunk.len);
+	if (buffer != NULL)
+	{
+		sha512_final(this);
+		memcpy(buffer, this->sha_out, HASH_SIZE_SHA384);
+		this->public.hasher_interface.reset(&(this->public.hasher_interface));
+	}
+}
+
+/**
+ * Implementation of hasher_t.get_hash for SHA512.
+ */
+static void get_hash512(private_sha512_hasher_t *this,
+						chunk_t chunk, u_int8_t *buffer)
+{
+	sha512_write(this, chunk.ptr, chunk.len);
+	if (buffer != NULL)
+	{
+		sha512_final(this);
+		memcpy(buffer, this->sha_out, HASH_SIZE_SHA512);
+		this->public.hasher_interface.reset(&(this->public.hasher_interface));
+	}
+}
+
+/**
+ * Implementation of hasher_t.allocate_hash for SHA256.
+ */
+static void allocate_hash256(private_sha256_hasher_t *this, 
+							 chunk_t chunk, chunk_t *hash)
+{
+	chunk_t allocated_hash;
+	
+	sha256_write(this, chunk.ptr, chunk.len);
+	if (hash != NULL)
+	{
+		sha256_final(this);
+		allocated_hash = chunk_alloc(HASH_SIZE_SHA256);
+		memcpy(allocated_hash.ptr, this->sha_out, HASH_SIZE_SHA256);
+		this->public.hasher_interface.reset(&(this->public.hasher_interface));
+		*hash = allocated_hash;
+	}
+}
+
+/**
+ * Implementation of hasher_t.allocate_hash for SHA384.
+ */
+static void allocate_hash384(private_sha512_hasher_t *this, 
+							 chunk_t chunk, chunk_t *hash)
+{
+	chunk_t allocated_hash;
+	
+	sha512_write(this, chunk.ptr, chunk.len);
+	if (hash != NULL)
+	{
+		sha512_final(this);
+		allocated_hash = chunk_alloc(HASH_SIZE_SHA384);
+		memcpy(allocated_hash.ptr, this->sha_out, HASH_SIZE_SHA384);
+		this->public.hasher_interface.reset(&(this->public.hasher_interface));
+		*hash = allocated_hash;
+	}
+}
+
+/**
+ * Implementation of hasher_t.allocate_hash for SHA512.
+ */
+static void allocate_hash512(private_sha512_hasher_t *this, 
+							 chunk_t chunk, chunk_t *hash)
+{
+	chunk_t allocated_hash;
+	
+	sha512_write(this, chunk.ptr, chunk.len);
+	if (hash != NULL)
+	{
+		sha512_final(this);
+		allocated_hash = chunk_alloc(HASH_SIZE_SHA512);
+		memcpy(allocated_hash.ptr, this->sha_out, HASH_SIZE_SHA512);
+		this->public.hasher_interface.reset(&(this->public.hasher_interface));
+		*hash = allocated_hash;
+	}
+}
+
+/**
+ * Implementation of hasher_t.get_hash_size for SHA256.
+ */
+static size_t get_hash_size256(private_sha256_hasher_t *this)
+{
+	return HASH_SIZE_SHA256;
+}
+	
+/**
+ * Implementation of hasher_t.get_hash_size for SHA384.
+ */
+static size_t get_hash_size384(private_sha512_hasher_t *this)
+{
+	return HASH_SIZE_SHA384;
+}
+	
+/**
+ * Implementation of hasher_t.get_hash_size for SHA512.
+ */
+static size_t get_hash_size512(private_sha512_hasher_t *this)
+{
+	return HASH_SIZE_SHA512;
+}
+
+/**
+ * Implementation of hasher_t.reset for SHA256
+ */
+static void reset256(private_sha256_hasher_t *ctx)
+{
+	memcpy(&ctx->sha_H[0], &sha256_hashInit[0], sizeof(ctx->sha_H));
+	ctx->sha_blocks = 0;
+	ctx->sha_bufCnt = 0;
+}
+
+/**
+ * Implementation of hasher_t.reset for SHA384
+ */
+static void reset384(private_sha512_hasher_t *ctx)
+{
+	memcpy(&ctx->sha_H[0], &sha384_hashInit[0], sizeof(ctx->sha_H));
+	ctx->sha_blocks = 0;
+	ctx->sha_blocksMSB = 0;
+	ctx->sha_bufCnt = 0;
+}
+
+/**
+ * Implementation of hasher_t.reset for SHA512
+ */
+static void reset512(private_sha512_hasher_t *ctx)
+{
+	memcpy(&ctx->sha_H[0], &sha512_hashInit[0], sizeof(ctx->sha_H));
+	ctx->sha_blocks = 0;
+	ctx->sha_blocksMSB = 0;
+	ctx->sha_bufCnt = 0;
+}
+
+/**
+ * Implementation of hasher_t.destroy.
+ */
+static void destroy(sha2_hasher_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+sha2_hasher_t *sha2_hasher_create(hash_algorithm_t algorithm)
+{
+	sha2_hasher_t *this;
+	
+	switch (algorithm)
+	{
+		case HASH_SHA256:
+			this = (sha2_hasher_t*)malloc_thing(private_sha256_hasher_t);
+			this->hasher_interface.reset = (void(*)(hasher_t*))reset256;
+			this->hasher_interface.get_hash_size = (size_t(*)(hasher_t*))get_hash_size256;
+			this->hasher_interface.get_hash = (void(*)(hasher_t*,chunk_t,u_int8_t*))get_hash256;
+			this->hasher_interface.allocate_hash = (void(*)(hasher_t*,chunk_t,chunk_t*))allocate_hash256;
+			break;
+		case HASH_SHA384:
+			/* uses SHA512 data structure */
+			this = (sha2_hasher_t*)malloc_thing(private_sha512_hasher_t);
+			this->hasher_interface.reset = (void(*)(hasher_t*))reset384;
+			this->hasher_interface.get_hash_size = (size_t(*)(hasher_t*))get_hash_size384;
+			this->hasher_interface.get_hash = (void(*)(hasher_t*,chunk_t,u_int8_t*))get_hash384;
+			this->hasher_interface.allocate_hash = (void(*)(hasher_t*,chunk_t,chunk_t*))allocate_hash384;
+			break;
+		case HASH_SHA512:
+			this = (sha2_hasher_t*)malloc_thing(private_sha512_hasher_t);
+			this->hasher_interface.reset = (void(*)(hasher_t*))reset512;
+			this->hasher_interface.get_hash_size = (size_t(*)(hasher_t*))get_hash_size512;
+			this->hasher_interface.get_hash = (void(*)(hasher_t*,chunk_t,u_int8_t*))get_hash512;
+			this->hasher_interface.allocate_hash = (void(*)(hasher_t*,chunk_t,chunk_t*))allocate_hash512;
+			break;
+		default:
+			return NULL;
+	}
+	this->hasher_interface.destroy = (void(*)(hasher_t*))destroy;
+	
+	/* initialize */
+	this->hasher_interface.reset(&this->hasher_interface);
+	
+	return this;
+}
diff --git a/src/libstrongswan/crypto/hashers/sha2_hasher.h b/src/libstrongswan/crypto/hashers/sha2_hasher.h
new file mode 100644
index 000000000..d5a8a7030
--- /dev/null
+++ b/src/libstrongswan/crypto/hashers/sha2_hasher.h
@@ -0,0 +1,63 @@
+/**
+ * @file sha2_hasher.h
+ * 
+ * @brief Interface of sha2_hasher_t
+ * 
+ */
+
+/*
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#ifndef SHA2_HASHER_H_
+#define SHA2_HASHER_H_
+
+#include <crypto/hashers/hasher.h>
+
+
+typedef struct sha2_hasher_t sha2_hasher_t;
+
+/**
+ * @brief Implementation of hasher_t interface using the SHA2 algorithms.
+ * 
+ * SHA2 is an other name for the SHA-256, SHA-384 and SHA-512 variants of
+ * the SHA hash algorithm.
+ * 
+ * @b Constructors:
+ * - hasher_create() using HASH_SHA256, HASH_SHA384 or HASH_SHA512 as algorithm
+ * - sha2_hasher_create()
+ * 
+ * @see hasher_t
+ * 
+ * @ingroup hashers
+ */
+struct sha2_hasher_t {
+	
+	/**
+	 * Generic hasher_t interface for this hasher.
+	 */
+	hasher_t hasher_interface;
+};
+
+/**
+ * @brief Creates a new sha2_hasher_t.
+ * 
+ * @param	algorithm	HASH_SHA256, HASH_SHA384 or HASH_SHA512
+ * @return				sha2_hasher_t object
+ * 
+ * @ingroup hashers
+ */
+sha2_hasher_t *sha2_hasher_create(hash_algorithm_t algorithm);
+
+#endif /* SHA2_HASHER_H_ */
diff --git a/src/libstrongswan/crypto/prfs/prf.c b/src/libstrongswan/crypto/prfs/prf.c
index eb500c53c..31b220a84 100644
--- a/src/libstrongswan/crypto/prfs/prf.c
+++ b/src/libstrongswan/crypto/prfs/prf.c
@@ -32,12 +32,12 @@
  * String mappings for encryption_algorithm_t.
  */
 mapping_t pseudo_random_function_m[] = {
-{PRF_UNDEFINED, "PRF_UNDEFINED"},
-{PRF_HMAC_MD5, "PRF_HMAC_MD5"},
-{PRF_HMAC_SHA1, "PRF_HMAC_SHA1"},
-{PRF_HMAC_TIGER, "PRF_HMAC_TIGER"},
-{PRF_AES128_CBC, "PRF_AES128_CBC"},
-{MAPPING_END, NULL}
+	{PRF_UNDEFINED, "PRF_UNDEFINED"},
+	{PRF_HMAC_MD5, "PRF_HMAC_MD5"},
+	{PRF_HMAC_SHA1, "PRF_HMAC_SHA1"},
+	{PRF_HMAC_TIGER, "PRF_HMAC_TIGER"},
+	{PRF_AES128_CBC, "PRF_AES128_CBC"},
+	{MAPPING_END, NULL}
 };
 
 /*
@@ -61,8 +61,3 @@ prf_t *prf_create(pseudo_random_function_t pseudo_random_function)
 			return NULL;
 	}
 }
-
-
-
-
-
diff --git a/src/libstrongswan/crypto/prfs/prf.h b/src/libstrongswan/crypto/prfs/prf.h
index 758e73671..2d30cc22e 100644
--- a/src/libstrongswan/crypto/prfs/prf.h
+++ b/src/libstrongswan/crypto/prfs/prf.h
@@ -31,7 +31,7 @@ typedef enum pseudo_random_function_t pseudo_random_function_t;
 /**
  * @brief Pseudo random function, as in IKEv2 RFC 3.3.2.
  * 
- * Currently only the following algorithms are implemented and therefore supported:
+ * Currently only the following algorithms are implemented:
  * - PRF_HMAC_MD5
  * - PRF_HMAC_SHA1
  * 
@@ -39,16 +39,12 @@ typedef enum pseudo_random_function_t pseudo_random_function_t;
  */
 enum pseudo_random_function_t {
 	PRF_UNDEFINED = 1024,
-	/**
-	 * Implemented in class hmac_prf_t.
-	 */
+	/** Implemented via hmac_prf_t. */
 	PRF_HMAC_MD5 = 1,
-	/**
-	 * Implemented in class hmac_prf_t.
-	 */
+	/** Implemented via hmac_prf_t. */
 	PRF_HMAC_SHA1 = 2,
 	PRF_HMAC_TIGER = 3,
-	PRF_AES128_CBC = 4
+	PRF_AES128_CBC = 4,
 };
 
 /** 
@@ -72,9 +68,8 @@ typedef struct prf_t prf_t;
  */
 struct prf_t {
 	/**
-	 * @brief Generates pseudo random bytes and writes them
-	 * in the buffer.
-	 * 
+	 * @brief Generates pseudo random bytes and writes them in the buffer.
+	 *
 	 * @param this			calling object
 	 * @param seed			a chunk containing the seed for the next bytes
 	 * @param[out] buffer	pointer where the generated bytes will be written
diff --git a/src/libstrongswan/crypto/signers/signer.h b/src/libstrongswan/crypto/signers/signer.h
index 4b03fc388..585183998 100644
--- a/src/libstrongswan/crypto/signers/signer.h
+++ b/src/libstrongswan/crypto/signers/signer.h
@@ -40,13 +40,9 @@ typedef enum integrity_algorithm_t integrity_algorithm_t;
  */
 enum integrity_algorithm_t {
 	AUTH_UNDEFINED = 1024,
-	/**
-	 * Implemented in class hmac_signer_t.
-	 */
+	/** Implemented via hmac_signer_t */
 	AUTH_HMAC_MD5_96 = 1,
-	/**
-	 * Implemented in class hmac_signer_t.
-	 */
+	/** Implemented via hmac_signer_t */
 	AUTH_HMAC_SHA1_96 = 2,
 	AUTH_DES_MAC = 3,
 	AUTH_KPDK_MD5 = 4,