diff --git a/twrpDigest/Android.mk b/twrpDigest/Android.mk
new file mode 100644
index 0000000..5e69822
--- /dev/null
+++ b/twrpDigest/Android.mk
@@ -0,0 +1,29 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libtwrpdigest
+LOCAL_MODULE_TAGS := optional
+LOCAL_CFLAGS = -fno-strict-aliasing
+LOCAL_C_INCLUDES := external/openssl/include bionic
+
+LOCAL_SRC_FILES = \
+        twrpDigest.cpp \
+        twrpMD5.cpp \
+        digest/md5/md5.c
+
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+        LOCAL_C_INCLUDES += external/stlport/stlport
+endif
+
+LOCAL_SHARED_LIBRARIES += libc libstdc++
+
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 23; echo $$?),0)
+        LOCAL_SHARED_LIBRARIES += libstlport
+else
+        LOCAL_SHARED_LIBRARIES += libc++ libcrypto
+	LOCAL_SRC_FILES += \
+        	twrpSHA.cpp
+endif
+
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/twrpDigest/digest/md5/md5.c b/twrpDigest/digest/md5/md5.c
new file mode 100644
index 0000000..488d16e
--- /dev/null
+++ b/twrpDigest/digest/md5/md5.c
@@ -0,0 +1,257 @@
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+#include <string.h>		/* for memcpy() */
+
+#include "md5.h"
+
+#if !defined(WORDS_BIGENDIAN)
+#define byteReverse(buf, len)	/* Nothing */
+#else
+void byteReverse(unsigned char *buf, unsigned longs);
+
+#ifndef ASM_MD5
+/*
+ * Note: this code is harmless on little-endian machines.
+ */
+void byteReverse(unsigned char *buf, unsigned longs)
+{
+    uint32_t t;
+    do {
+	t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
+	    ((unsigned) buf[1] << 8 | buf[0]);
+	*(uint32_t *) buf = t;
+	buf += 4;
+    } while (--longs);
+}
+#endif
+#endif
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void MD5Init(struct MD5Context *ctx)
+{
+    ctx->buf[0] = 0x67452301;
+    ctx->buf[1] = 0xefcdab89;
+    ctx->buf[2] = 0x98badcfe;
+    ctx->buf[3] = 0x10325476;
+
+    ctx->bits[0] = 0;
+    ctx->bits[1] = 0;
+}
+
+/*
+ * Update context to reflect the concatenation of another buffer full
+ * of bytes.
+ */
+void MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
+{
+    uint32_t t;
+
+    /* Update bitcount */
+
+    t = ctx->bits[0];
+    if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
+	ctx->bits[1]++;		/* Carry from low to high */
+    ctx->bits[1] += len >> 29;
+
+    t = (t >> 3) & 0x3f;	/* Bytes already in shsInfo->data */
+
+    /* Handle any leading odd-sized chunks */
+
+    if (t) {
+	unsigned char *p = (unsigned char *) ctx->in + t;
+
+	t = 64 - t;
+	if (len < t) {
+	    memcpy(p, buf, len);
+	    return;
+	}
+	memcpy(p, buf, t);
+	byteReverse(ctx->in, 16);
+	MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+	buf += t;
+	len -= t;
+    }
+    /* Process data in 64-byte chunks */
+
+    while (len >= 64) {
+	memcpy(ctx->in, buf, 64);
+	byteReverse(ctx->in, 16);
+	MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+	buf += 64;
+	len -= 64;
+    }
+
+    /* Handle any remaining bytes of data. */
+
+    memcpy(ctx->in, buf, len);
+}
+
+/*
+ * Final wrapup - pad to 64-byte boundary with the bit pattern 
+ * 1 0* (64-bit count of bits processed, MSB-first)
+ */
+void MD5Final(unsigned char digest[MD5LENGTH], struct MD5Context *ctx)
+{
+    unsigned count;
+    unsigned char *p;
+
+    /* Compute number of bytes mod 64 */
+    count = (ctx->bits[0] >> 3) & 0x3F;
+
+    /* Set the first char of padding to 0x80.  This is safe since there is
+       always at least one byte free */
+    p = ctx->in + count;
+    *p++ = 0x80;
+
+    /* Bytes of padding needed to make 64 bytes */
+    count = 64 - 1 - count;
+
+    /* Pad out to 56 mod 64 */
+    if (count < 8) {
+	/* Two lots of padding:  Pad the first block to 64 bytes */
+	memset(p, 0, count);
+	byteReverse(ctx->in, 16);
+	MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+
+	/* Now fill the next block with 56 bytes */
+	memset(ctx->in, 0, 56);
+    } else {
+	/* Pad block to 56 bytes */
+	memset(p, 0, count - 8);
+    }
+    byteReverse(ctx->in, 14);
+
+    /* Append length in bits and transform.
+     * Use memcpy to avoid aliasing problems.  On most systems,
+     * this will be optimized away to the same code.
+     */
+    memcpy(&ctx->in[14 * sizeof(uint32_t)], &ctx->bits[0], 4);
+    memcpy(&ctx->in[15 * sizeof(uint32_t)], &ctx->bits[1], 4);
+
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    byteReverse((unsigned char *) ctx->buf, 4);
+    memcpy(digest, ctx->buf, MD5LENGTH);
+    memset(ctx, 0, sizeof(*ctx));	/* In case it's sensitive */
+}
+
+#ifndef ASM_MD5
+
+/* The four core functions - F1 is optimized somewhat */
+
+/* #define F1(x, y, z) (x & y | ~x & z) */
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f, w, x, y, z, data, s) \
+	( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data.  MD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+void MD5Transform(uint32_t buf[4], uint32_t const in[16])
+{
+    register uint32_t a, b, c, d;
+
+    a = buf[0];
+    b = buf[1];
+    c = buf[2];
+    d = buf[3];
+
+    MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+    MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+    MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+    MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+    MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+    MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+    MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+    MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+    MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+    MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+    MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+    MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+    MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+    MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+    MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+    MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+    MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+    MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+    MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+    MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+    MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+    MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+    MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+    MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+    MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+    MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+    MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+    MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+    MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+    MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+    MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+    MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+    MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+    MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+    MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+    MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+    MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+    MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+    MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+    MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+    MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+    MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+    MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+    MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+    MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+    MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+    MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+    MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+    MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+    MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+    MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+    MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+    MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+    MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+    MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+    MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+    MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+    MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+    MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+    MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+    MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+    MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+    MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+    MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+    buf[0] += a;
+    buf[1] += b;
+    buf[2] += c;
+    buf[3] += d;
+}
+
+#endif
+
diff --git a/twrpDigest/digest/md5/md5.h b/twrpDigest/digest/md5/md5.h
new file mode 100644
index 0000000..cf30688
--- /dev/null
+++ b/twrpDigest/digest/md5/md5.h
@@ -0,0 +1,29 @@
+#ifndef MD5_H
+#define MD5_H
+
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#else
+typedef unsigned int uint32_t;
+#endif
+
+#define MD5LENGTH 16
+
+struct MD5Context {
+	uint32_t buf[4];
+	uint32_t bits[2];
+	unsigned char in[64];
+};
+
+void MD5Init(struct MD5Context *context);
+void MD5Update(struct MD5Context *context, unsigned char const *buf,
+	       unsigned len);
+void MD5Final(unsigned char digest[MD5LENGTH], struct MD5Context *context);
+void MD5Transform(uint32_t buf[4], uint32_t const in[16]);
+
+/*
+ * This is needed to make RSAREF happy on some MS-DOS compilers.
+ */
+//typedef struct MD5Context MD5_CTX;
+
+#endif /* !MD5_H */
diff --git a/twrpDigest/twrpDigest.cpp b/twrpDigest/twrpDigest.cpp
new file mode 100644
index 0000000..69c9701
--- /dev/null
+++ b/twrpDigest/twrpDigest.cpp
@@ -0,0 +1,33 @@
+/*
+	Copyright 2012 to 2017 TeamWin
+	This file is part of TWRP/TeamWin Recovery Project.
+
+	TWRP 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 3 of the License, or
+	(at your option) any later version.
+
+	TWRP 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 TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <vector>
+#include <string>
+#include <fcntl.h>
+#include "twrpDigest.hpp"
+
+std::string twrpDigest::hexify(uint8_t* hash, size_t len) {
+	char hex[3];
+	std::string digest_string;
+
+	for (size_t i = 0; i < len; ++i) {
+		snprintf(hex, 3, "%02x", hash[i]);
+		digest_string += hex;
+	}
+	return digest_string;
+}
diff --git a/twrpDigest/twrpDigest.hpp b/twrpDigest/twrpDigest.hpp
new file mode 100644
index 0000000..1803a28
--- /dev/null
+++ b/twrpDigest/twrpDigest.hpp
@@ -0,0 +1,35 @@
+/*
+        Copyright 2012 to 2017 TeamWin
+        This file is part of TWRP/TeamWin Recovery Project.
+
+        TWRP 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 3 of the License, or
+        (at your option) any later version.
+
+        TWRP 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 TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __TWRPDIGEST_H
+#define __TWRPDIGEST_H
+
+class twrpDigest {
+public:
+	twrpDigest() {};
+	virtual ~twrpDigest() {};
+	virtual void init() = 0;                                         // Initialize the digest according to the algorithm
+	virtual void update(const unsigned char* stream, size_t len) = 0;         // Update the digest with new data
+	virtual std::string return_digest_string() = 0;                  // Returns the digest of the file as a string.
+
+protected:
+	virtual void finalize() = 0;                                     // Finalize the digest input for creating the final digest
+	std::string hexify(uint8_t* hash, size_t len);                   // Take an len bytes and turn it into a hex string
+};
+
+#endif //__TWRPDIGEST_H
diff --git a/twrpDigest/twrpMD5.cpp b/twrpDigest/twrpMD5.cpp
new file mode 100644
index 0000000..50ccf74
--- /dev/null
+++ b/twrpDigest/twrpMD5.cpp
@@ -0,0 +1,47 @@
+/*
+	Copyright 2012 to 2017 TeamWin
+	This file is part of TWRP/TeamWin Recovery Project.
+
+	TWRP 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 3 of the License, or
+	(at your option) any later version.
+
+	TWRP 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 TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <vector>
+#include <string>
+//#include <sstream>
+#include "twrpDigest.hpp"
+#include "twrpMD5.hpp"
+
+twrpMD5::twrpMD5() {
+	init();
+}
+
+void twrpMD5::init() {
+	MD5Init(&md5c);
+}
+
+void twrpMD5::update(const unsigned char* stream, size_t len) {
+	MD5Update(&md5c, stream, len);
+}
+
+void twrpMD5::finalize() {
+	MD5Final(md5sum, &md5c);
+}
+
+std::string twrpMD5::return_digest_string() {
+	std::string md5string;
+	finalize();
+
+	md5string = hexify(md5sum, sizeof(md5sum));
+	return md5string;
+}
diff --git a/twrpDigest/twrpMD5.hpp b/twrpDigest/twrpMD5.hpp
new file mode 100644
index 0000000..40cac18
--- /dev/null
+++ b/twrpDigest/twrpMD5.hpp
@@ -0,0 +1,42 @@
+/*
+        Copyright 2012 to 2017 TeamWin
+        This file is part of TWRP/TeamWin Recovery Project.
+
+        TWRP 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 3 of the License, or
+        (at your option) any later version.
+
+        TWRP 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 TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __TWRPMD5_H
+#define __TWRPMD5_H
+
+#include <string>
+#include "twrpDigest.hpp"
+
+extern "C" {
+	#include "digest/md5/md5.h"
+}
+
+class twrpMD5: public twrpDigest {
+public:
+	twrpMD5();                                                            // Stream initializer
+	void init();                                                          // Initialize MD5 structures
+	void update(const unsigned char* stream, size_t len);                 // Update MD5 stream with data. Return false if failure to update MD5.
+	std::string return_digest_string();                                   // Return MD5 digest as string to callee
+	void finalize();                                                      // Finalize and compute MD5
+
+private:
+	struct MD5Context md5c;                                               // MD5 control structure
+	unsigned char md5sum[MD5LENGTH];                                      // Stores the md5sum computation
+};
+
+#endif //__TWRPMD5_H
diff --git a/twrpDigest/twrpSHA.cpp b/twrpDigest/twrpSHA.cpp
new file mode 100644
index 0000000..60262e7
--- /dev/null
+++ b/twrpDigest/twrpSHA.cpp
@@ -0,0 +1,69 @@
+/*
+	Copyright 2012 to 2017 TeamWin
+	This file is part of TWRP/TeamWin Recovery Project.
+
+	TWRP 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 3 of the License, or
+	(at your option) any later version.
+
+	TWRP 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 TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <vector>
+#include <string>
+#include <sstream>
+#include <string>
+#include <openssl/sha.h>
+#include "twrpDigest.hpp"
+#include "twrpSHA.hpp"
+
+twrpSHA256::twrpSHA256() {
+	twrpSHA256::init();
+}
+
+void twrpSHA256::init(void) {
+	SHA256_Init(&sha256_ctx);
+}
+
+void twrpSHA256::update(const unsigned char* stream, size_t len) {
+	SHA256_Update(&sha256_ctx, stream, len);
+}
+
+void twrpSHA256::finalize(void) {
+	SHA256_Final(sha256_store, &sha256_ctx);
+}
+
+std::string twrpSHA256::return_digest_string(void) {
+	twrpSHA256::finalize();
+	std::string digest_str = twrpDigest::hexify(sha256_store, SHA256_DIGEST_LENGTH);
+	return digest_str;
+}
+
+twrpSHA512::twrpSHA512() {
+	twrpSHA512::init();
+}
+
+void twrpSHA512::init(void) {
+	SHA512_Init(&sha512_ctx);
+}
+
+void twrpSHA512::update(const unsigned char* stream, size_t len) {
+	SHA512_Update(&sha512_ctx, stream, len);
+}
+
+void twrpSHA512::finalize(void) {
+	SHA512_Final(sha512_store, &sha512_ctx);
+}
+
+std::string twrpSHA512::return_digest_string(void) {
+	twrpSHA512::finalize();
+	std::string digest_str = twrpDigest::hexify(sha512_store, SHA512_DIGEST_LENGTH);
+	return digest_str;
+}
diff --git a/twrpDigest/twrpSHA.hpp b/twrpDigest/twrpSHA.hpp
new file mode 100644
index 0000000..e389930
--- /dev/null
+++ b/twrpDigest/twrpSHA.hpp
@@ -0,0 +1,54 @@
+/*
+        Copyright 2012 to 2017 TeamWin
+        This file is part of TWRP/TeamWin Recovery Project.
+
+        TWRP 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 3 of the License, or
+        (at your option) any later version.
+
+        TWRP 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 TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef __TWRPSHA_H
+#define __TWRPSHA_H
+
+#include <openssl/sha.h>
+#include "twrpDigest.hpp"
+
+class twrpSHA256: public twrpDigest {
+public:
+	twrpSHA256();                                            // Initialize the SHA256 digest for streaming activities only
+	void init();                                             // Initialize the SHA256 digest algorithm
+
+protected:
+	void update(const unsigned char* stream, size_t len);    // Update the SHA256 digest stream
+	void finalize();                                         // Finalize the SHA256 digest for computation
+	std::string return_digest_string();                      // Return the digest string computed to the callee
+
+private:
+	uint8_t sha256_store[SHA256_DIGEST_LENGTH];              // Initialize the SHA256 digest array that holds the computation
+	SHA256_CTX sha256_ctx;                                   // Initialize the SHA256 control structure
+};
+
+class twrpSHA512: public twrpDigest {
+public:
+	twrpSHA512();                                            // Initialize the SHA512 digest for streaming activities only
+	void init();                                             // Initialize the SHA512 digest algorithm
+
+protected:
+	void update(const unsigned char* stream, size_t len);    // Update the SHA512 digest stream
+	void finalize();                                         // Finalize the SHA512 digest for computation
+	std::string return_digest_string();                      // Return the digest string computed to the callee
+
+private:
+	uint8_t sha512_store[SHA512_DIGEST_LENGTH];              // Initialize the SHA512 digest array that holds the computation
+	SHA512_CTX sha512_ctx;                                   // Initialize the SHA512 control structure
+};
+
+#endif //__TWRPSHA_H