Merge pull request #9198

e151ff7 update blake2b test vectors (koe)
fa47c7b add blake2b to src/crypto (koe)

3 files changed, 680 insertions, 0 deletions

diff --git a/src/crypto/CMakeLists.txt b/src/crypto/CMakeLists.txt
index 9ac376780..2559c754e 100644
--- a/src/crypto/CMakeLists.txt
+++ b/src/crypto/CMakeLists.txt
@@ -29,6 +29,7 @@
 set(crypto_sources
   aesb.c
   blake256.c
+  blake2b.c
   chacha.c
   crypto-ops-data.c
   crypto-ops.c
diff --git a/src/crypto/blake2b.c b/src/crypto/blake2b.c
new file mode 100644
index 000000000..7e8be7890
--- /dev/null
+++ b/src/crypto/blake2b.c
@@ -0,0 +1,563 @@
+/*
+Copyright (c) 2018-2019, tevador <tevador@gmail.com>
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+	* Redistributions of source code must retain the above copyright
+	  notice, this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright
+	  notice, this list of conditions and the following disclaimer in the
+	  documentation and/or other materials provided with the distribution.
+	* Neither the name of the copyright holder nor the
+	  names of its contributors may be used to endorse or promote products
+	  derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* Original code from Argon2 reference source code package used under CC0 Licence
+ * https://github.com/P-H-C/phc-winner-argon2
+ * Copyright 2015
+ * Daniel Dinu, Dmitry Khovratovich, Jean-Philippe Aumasson, and Samuel Neves
+*/
+
+#include "blake2b.h"
+
+#include "memwipe.h"
+
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+
+/// BEGIN: endian.h
+
+#if defined(_MSC_VER)
+#define FORCE_INLINE __inline
+#elif defined(__GNUC__) || defined(__clang__)
+#define FORCE_INLINE __inline__
+#else
+#define FORCE_INLINE
+#endif
+
+ /* Argon2 Team - Begin Code */
+ /*
+	Not an exhaustive list, but should cover the majority of modern platforms
+	Additionally, the code will always be correct---this is only a performance
+	tweak.
+ */
+#if (defined(__BYTE_ORDER__) &&                                                \
+     (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)) ||                           \
+    defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) || defined(__MIPSEL__) || \
+    defined(__AARCH64EL__) || defined(__amd64__) || defined(__i386__) ||       \
+    defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64) ||                \
+    defined(_M_ARM)
+#define NATIVE_LITTLE_ENDIAN
+#endif
+ /* Argon2 Team - End Code */
+
+static FORCE_INLINE uint32_t load32(const void *src) {
+#if defined(NATIVE_LITTLE_ENDIAN)
+	uint32_t w;
+	memcpy(&w, src, sizeof w);
+	return w;
+#else
+	const uint8_t *p = (const uint8_t *)src;
+	uint32_t w = *p++;
+	w |= (uint32_t)(*p++) << 8;
+	w |= (uint32_t)(*p++) << 16;
+	w |= (uint32_t)(*p++) << 24;
+	return w;
+#endif
+}
+
+static FORCE_INLINE uint64_t load64_native(const void *src) {
+	uint64_t w;
+	memcpy(&w, src, sizeof w);
+	return w;
+}
+
+static FORCE_INLINE uint64_t load64(const void *src) {
+#if defined(NATIVE_LITTLE_ENDIAN)
+	return load64_native(src);
+#else
+	const uint8_t *p = (const uint8_t *)src;
+	uint64_t w = *p++;
+	w |= (uint64_t)(*p++) << 8;
+	w |= (uint64_t)(*p++) << 16;
+	w |= (uint64_t)(*p++) << 24;
+	w |= (uint64_t)(*p++) << 32;
+	w |= (uint64_t)(*p++) << 40;
+	w |= (uint64_t)(*p++) << 48;
+	w |= (uint64_t)(*p++) << 56;
+	return w;
+#endif
+}
+
+static FORCE_INLINE void store32(void *dst, uint32_t w) {
+#if defined(NATIVE_LITTLE_ENDIAN)
+	memcpy(dst, &w, sizeof w);
+#else
+	uint8_t *p = (uint8_t *)dst;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+#endif
+}
+
+static FORCE_INLINE void store64_native(void *dst, uint64_t w) {
+	memcpy(dst, &w, sizeof w);
+}
+
+static FORCE_INLINE void store64(void *dst, uint64_t w) {
+#if defined(NATIVE_LITTLE_ENDIAN)
+	store64_native(dst, w);
+#else
+	uint8_t *p = (uint8_t *)dst;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+#endif
+}
+
+/// END: endian.h
+
+/// BEGIN: blake2-impl.h
+
+static FORCE_INLINE uint64_t load48(const void *src) {
+	const uint8_t *p = (const uint8_t *)src;
+	uint64_t w = *p++;
+	w |= (uint64_t)(*p++) << 8;
+	w |= (uint64_t)(*p++) << 16;
+	w |= (uint64_t)(*p++) << 24;
+	w |= (uint64_t)(*p++) << 32;
+	w |= (uint64_t)(*p++) << 40;
+	return w;
+}
+
+static FORCE_INLINE void store48(void *dst, uint64_t w) {
+	uint8_t *p = (uint8_t *)dst;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+	w >>= 8;
+	*p++ = (uint8_t)w;
+}
+
+static FORCE_INLINE uint32_t rotr32(const uint32_t w, const unsigned c) {
+	return (w >> c) | (w << (32 - c));
+}
+
+static FORCE_INLINE uint64_t rotr64(const uint64_t w, const unsigned c) {
+	return (w >> c) | (w << (64 - c));
+}
+
+/// END: blake2-impl.h
+
+void clear_internal_memory(void *mem, const size_t length) {
+    memwipe(mem, length);
+}
+
+/// BEGIN: blake2b.c
+
+static const uint64_t blake2b_IV[8] = {
+	UINT64_C(0x6a09e667f3bcc908), UINT64_C(0xbb67ae8584caa73b),
+	UINT64_C(0x3c6ef372fe94f82b), UINT64_C(0xa54ff53a5f1d36f1),
+	UINT64_C(0x510e527fade682d1), UINT64_C(0x9b05688c2b3e6c1f),
+	UINT64_C(0x1f83d9abfb41bd6b), UINT64_C(0x5be0cd19137e2179) };
+
+static const unsigned int blake2b_sigma[12][16] = {
+	{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
+	{14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3},
+	{11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4},
+	{7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8},
+	{9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13},
+	{2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9},
+	{12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11},
+	{13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10},
+	{6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5},
+	{10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0},
+	{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
+	{14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3},
+};
+
+static FORCE_INLINE void blake2b_set_lastnode(blake2b_state *S) {
+	S->f[1] = (uint64_t)-1;
+}
+
+static FORCE_INLINE void blake2b_set_lastblock(blake2b_state *S) {
+	if (S->last_node) {
+		blake2b_set_lastnode(S);
+	}
+	S->f[0] = (uint64_t)-1;
+}
+
+static FORCE_INLINE void blake2b_increment_counter(blake2b_state *S,
+	uint64_t inc) {
+	S->t[0] += inc;
+	S->t[1] += (S->t[0] < inc);
+}
+
+static FORCE_INLINE void blake2b_invalidate_state(blake2b_state *S) {
+	clear_internal_memory(S, sizeof(*S));      /* wipe */
+	blake2b_set_lastblock(S); /* invalidate for further use */
+}
+
+static FORCE_INLINE void blake2b_init0(blake2b_state *S) {
+	memset(S, 0, sizeof(*S));
+	memcpy(S->h, blake2b_IV, sizeof(S->h));
+}
+
+int blake2b_init_param(blake2b_state *S, const blake2b_param *P) {
+	const unsigned char *p = (const unsigned char *)P;
+	unsigned int i;
+
+	if (NULL == P || NULL == S) {
+		return -1;
+	}
+
+	blake2b_init0(S);
+	/* IV XOR Parameter Block */
+	for (i = 0; i < 8; ++i) {
+		S->h[i] ^= load64(&p[i * sizeof(S->h[i])]);
+	}
+	S->outlen = P->digest_length;
+	return 0;
+}
+
+/* Sequential blake2b initialization */
+int blake2b_init(blake2b_state *S, size_t outlen) {
+	blake2b_param P;
+
+	if (S == NULL) {
+		return -1;
+	}
+
+	if ((outlen == 0) || (outlen > BLAKE2B_OUTBYTES)) {
+		blake2b_invalidate_state(S);
+		return -1;
+	}
+
+	/* Setup Parameter Block for unkeyed BLAKE2 */
+	P.digest_length = (uint8_t)outlen;
+	P.key_length = 0;
+	P.fanout = 1;
+	P.depth = 1;
+	P.leaf_length = 0;
+	P.node_offset = 0;
+	P.node_depth = 0;
+	P.inner_length = 0;
+	memset(P.reserved, 0, sizeof(P.reserved));
+	memset(P.salt, 0, sizeof(P.salt));
+	memset(P.personal, 0, sizeof(P.personal));
+
+	return blake2b_init_param(S, &P);
+}
+
+int blake2b_init_key(blake2b_state *S, size_t outlen, const void *key, size_t keylen) {
+	blake2b_param P;
+
+	if (S == NULL) {
+		return -1;
+	}
+
+	if ((outlen == 0) || (outlen > BLAKE2B_OUTBYTES)) {
+		blake2b_invalidate_state(S);
+		return -1;
+	}
+
+	if ((key == 0) || (keylen == 0) || (keylen > BLAKE2B_KEYBYTES)) {
+		blake2b_invalidate_state(S);
+		return -1;
+	}
+
+	/* Setup Parameter Block for keyed BLAKE2 */
+	P.digest_length = (uint8_t)outlen;
+	P.key_length = (uint8_t)keylen;
+	P.fanout = 1;
+	P.depth = 1;
+	P.leaf_length = 0;
+	P.node_offset = 0;
+	P.node_depth = 0;
+	P.inner_length = 0;
+	memset(P.reserved, 0, sizeof(P.reserved));
+	memset(P.salt, 0, sizeof(P.salt));
+	memset(P.personal, 0, sizeof(P.personal));
+
+	if (blake2b_init_param(S, &P) < 0) {
+		blake2b_invalidate_state(S);
+		return -1;
+	}
+
+	{
+		uint8_t block[BLAKE2B_BLOCKBYTES];
+		memset(block, 0, BLAKE2B_BLOCKBYTES);
+		memcpy(block, key, keylen);
+		blake2b_update(S, block, BLAKE2B_BLOCKBYTES);
+		/* Burn the key from stack */
+		clear_internal_memory(block, BLAKE2B_BLOCKBYTES);
+	}
+	return 0;
+}
+
+static void blake2b_compress(blake2b_state *S, const uint8_t *block) {
+	uint64_t m[16];
+	uint64_t v[16];
+	unsigned int i, r;
+
+	for (i = 0; i < 16; ++i) {
+		m[i] = load64(block + i * sizeof(m[i]));
+	}
+
+	for (i = 0; i < 8; ++i) {
+		v[i] = S->h[i];
+	}
+
+	v[8] = blake2b_IV[0];
+	v[9] = blake2b_IV[1];
+	v[10] = blake2b_IV[2];
+	v[11] = blake2b_IV[3];
+	v[12] = blake2b_IV[4] ^ S->t[0];
+	v[13] = blake2b_IV[5] ^ S->t[1];
+	v[14] = blake2b_IV[6] ^ S->f[0];
+	v[15] = blake2b_IV[7] ^ S->f[1];
+
+#define G(r, i, a, b, c, d)                                                    \
+    do {                                                                       \
+        a = a + b + m[blake2b_sigma[r][2 * i + 0]];                            \
+        d = rotr64(d ^ a, 32);                                                 \
+        c = c + d;                                                             \
+        b = rotr64(b ^ c, 24);                                                 \
+        a = a + b + m[blake2b_sigma[r][2 * i + 1]];                            \
+        d = rotr64(d ^ a, 16);                                                 \
+        c = c + d;                                                             \
+        b = rotr64(b ^ c, 63);                                                 \
+    } while ((void)0, 0)
+
+#define ROUND(r)                                                               \
+    do {                                                                       \
+        G(r, 0, v[0], v[4], v[8], v[12]);                                      \
+        G(r, 1, v[1], v[5], v[9], v[13]);                                      \
+        G(r, 2, v[2], v[6], v[10], v[14]);                                     \
+        G(r, 3, v[3], v[7], v[11], v[15]);                                     \
+        G(r, 4, v[0], v[5], v[10], v[15]);                                     \
+        G(r, 5, v[1], v[6], v[11], v[12]);                                     \
+        G(r, 6, v[2], v[7], v[8], v[13]);                                      \
+        G(r, 7, v[3], v[4], v[9], v[14]);                                      \
+    } while ((void)0, 0)
+
+	for (r = 0; r < 12; ++r) {
+		ROUND(r);
+	}
+
+	for (i = 0; i < 8; ++i) {
+		S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
+	}
+
+#undef G
+#undef ROUND
+}
+
+int blake2b_update(blake2b_state *S, const void *in, size_t inlen) {
+	const uint8_t *pin = (const uint8_t *)in;
+
+	if (inlen == 0) {
+		return 0;
+	}
+
+	/* Sanity check */
+	if (S == NULL || in == NULL) {
+		return -1;
+	}
+
+	/* Is this a reused state? */
+	if (S->f[0] != 0) {
+		return -1;
+	}
+
+	if (S->buflen + inlen > BLAKE2B_BLOCKBYTES) {
+		/* Complete current block */
+		size_t left = S->buflen;
+		size_t fill = BLAKE2B_BLOCKBYTES - left;
+		memcpy(&S->buf[left], pin, fill);
+		blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
+		blake2b_compress(S, S->buf);
+		S->buflen = 0;
+		inlen -= fill;
+		pin += fill;
+		/* Avoid buffer copies when possible */
+		while (inlen > BLAKE2B_BLOCKBYTES) {
+			blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
+			blake2b_compress(S, pin);
+			inlen -= BLAKE2B_BLOCKBYTES;
+			pin += BLAKE2B_BLOCKBYTES;
+		}
+	}
+	memcpy(&S->buf[S->buflen], pin, inlen);
+	S->buflen += (unsigned int)inlen;
+	return 0;
+}
+
+int blake2b_final(blake2b_state *S, void *out, size_t outlen) {
+	uint8_t buffer[BLAKE2B_OUTBYTES] = { 0 };
+	unsigned int i;
+
+	/* Sanity checks */
+	if (S == NULL || out == NULL || outlen < S->outlen) {
+		return -1;
+	}
+
+	/* Is this a reused state? */
+	if (S->f[0] != 0) {
+		return -1;
+	}
+
+	blake2b_increment_counter(S, S->buflen);
+	blake2b_set_lastblock(S);
+	memset(&S->buf[S->buflen], 0, BLAKE2B_BLOCKBYTES - S->buflen); /* Padding */
+	blake2b_compress(S, S->buf);
+
+	for (i = 0; i < 8; ++i) { /* Output full hash to temp buffer */
+		store64(buffer + sizeof(S->h[i]) * i, S->h[i]);
+	}
+
+	memcpy(out, buffer, S->outlen);
+	clear_internal_memory(buffer, sizeof(buffer));
+	clear_internal_memory(S->buf, sizeof(S->buf));
+	clear_internal_memory(S->h, sizeof(S->h));
+	return 0;
+}
+
+int blake2b(void *out, size_t outlen, const void *in, size_t inlen,
+	const void *key, size_t keylen) {
+	blake2b_state S;
+	int ret = -1;
+
+	/* Verify parameters */
+	if (NULL == in && inlen > 0) {
+		goto fail;
+	}
+
+	if (NULL == out || outlen == 0 || outlen > BLAKE2B_OUTBYTES) {
+		goto fail;
+	}
+
+	if ((NULL == key && keylen > 0) || keylen > BLAKE2B_KEYBYTES) {
+		goto fail;
+	}
+
+	if (keylen > 0) {
+		if (blake2b_init_key(&S, outlen, key, keylen) < 0) {
+			goto fail;
+		}
+	}
+	else {
+		if (blake2b_init(&S, outlen) < 0) {
+			goto fail;
+		}
+	}
+
+	if (blake2b_update(&S, in, inlen) < 0) {
+		goto fail;
+	}
+	ret = blake2b_final(&S, out, outlen);
+
+fail:
+	clear_internal_memory(&S, sizeof(S));
+	return ret;
+}
+
+/* Argon2 Team - Begin Code */
+int blake2b_long(void *pout, size_t outlen, const void *in, size_t inlen) {
+	uint8_t *out = (uint8_t *)pout;
+	blake2b_state blake_state;
+	uint8_t outlen_bytes[sizeof(uint32_t)] = { 0 };
+	int ret = -1;
+
+	if (outlen > UINT32_MAX) {
+		goto fail;
+	}
+
+	/* Ensure little-endian byte order! */
+	store32(outlen_bytes, (uint32_t)outlen);
+
+#define TRY(statement)                                                         \
+    do {                                                                       \
+        ret = statement;                                                       \
+        if (ret < 0) {                                                         \
+            goto fail;                                                         \
+        }                                                                      \
+    } while ((void)0, 0)
+
+	if (outlen <= BLAKE2B_OUTBYTES) {
+		TRY(blake2b_init(&blake_state, outlen));
+		TRY(blake2b_update(&blake_state, outlen_bytes, sizeof(outlen_bytes)));
+		TRY(blake2b_update(&blake_state, in, inlen));
+		TRY(blake2b_final(&blake_state, out, outlen));
+	}
+	else {
+		uint32_t toproduce;
+		uint8_t out_buffer[BLAKE2B_OUTBYTES];
+		uint8_t in_buffer[BLAKE2B_OUTBYTES];
+		TRY(blake2b_init(&blake_state, BLAKE2B_OUTBYTES));
+		TRY(blake2b_update(&blake_state, outlen_bytes, sizeof(outlen_bytes)));
+		TRY(blake2b_update(&blake_state, in, inlen));
+		TRY(blake2b_final(&blake_state, out_buffer, BLAKE2B_OUTBYTES));
+		memcpy(out, out_buffer, BLAKE2B_OUTBYTES / 2);
+		out += BLAKE2B_OUTBYTES / 2;
+		toproduce = (uint32_t)outlen - BLAKE2B_OUTBYTES / 2;
+
+		while (toproduce > BLAKE2B_OUTBYTES) {
+			memcpy(in_buffer, out_buffer, BLAKE2B_OUTBYTES);
+			TRY(blake2b(out_buffer, BLAKE2B_OUTBYTES, in_buffer,
+				BLAKE2B_OUTBYTES, NULL, 0));
+			memcpy(out, out_buffer, BLAKE2B_OUTBYTES / 2);
+			out += BLAKE2B_OUTBYTES / 2;
+			toproduce -= BLAKE2B_OUTBYTES / 2;
+		}
+
+		memcpy(in_buffer, out_buffer, BLAKE2B_OUTBYTES);
+		TRY(blake2b(out_buffer, toproduce, in_buffer, BLAKE2B_OUTBYTES, NULL,
+			0));
+		memcpy(out, out_buffer, toproduce);
+	}
+fail:
+	clear_internal_memory(&blake_state, sizeof(blake_state));
+	return ret;
+#undef TRY
+}
+/* Argon2 Team - End Code */
+
+/// END: blake2b.c
diff --git a/src/crypto/blake2b.h b/src/crypto/blake2b.h
new file mode 100644
index 000000000..ea00f381b
--- /dev/null
+++ b/src/crypto/blake2b.h
@@ -0,0 +1,116 @@
+/*
+Copyright (c) 2018-2019, tevador <tevador@gmail.com>
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+	* Redistributions of source code must retain the above copyright
+	  notice, this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright
+	  notice, this list of conditions and the following disclaimer in the
+	  documentation and/or other materials provided with the distribution.
+	* Neither the name of the copyright holder nor the
+	  names of its contributors may be used to endorse or promote products
+	  derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* Original code from Argon2 reference source code package used under CC0 Licence
+ * https://github.com/P-H-C/phc-winner-argon2
+ * Copyright 2015
+ * Daniel Dinu, Dmitry Khovratovich, Jean-Philippe Aumasson, and Samuel Neves
+*/
+
+/// NOTE: implementation lifted out of randomx package
+
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+#include <limits.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+	enum blake2b_constant {
+		BLAKE2B_BLOCKBYTES = 128,
+		BLAKE2B_OUTBYTES = 64,
+		BLAKE2B_KEYBYTES = 64,
+		BLAKE2B_SALTBYTES = 16,
+		BLAKE2B_PERSONALBYTES = 16
+	};
+
+#pragma pack(push, 1)
+	typedef struct __blake2b_param {
+		uint8_t digest_length;                   /* 1 */
+		uint8_t key_length;                      /* 2 */
+		uint8_t fanout;                          /* 3 */
+		uint8_t depth;                           /* 4 */
+		uint32_t leaf_length;                    /* 8 */
+		uint64_t node_offset;                    /* 16 */
+		uint8_t node_depth;                      /* 17 */
+		uint8_t inner_length;                    /* 18 */
+		uint8_t reserved[14];                    /* 32 */
+		uint8_t salt[BLAKE2B_SALTBYTES];         /* 48 */
+		uint8_t personal[BLAKE2B_PERSONALBYTES]; /* 64 */
+	} blake2b_param;
+#pragma pack(pop)
+
+	typedef struct __blake2b_state {
+		uint64_t h[8];
+		uint64_t t[2];
+		uint64_t f[2];
+		uint8_t buf[BLAKE2B_BLOCKBYTES];
+		unsigned buflen;
+		unsigned outlen;
+		uint8_t last_node;
+	} blake2b_state;
+
+	/* Ensure param structs have not been wrongly padded */
+	/* Poor man's static_assert */
+	enum {
+		blake2_size_check_0 = 1 / !!(CHAR_BIT == 8),
+		blake2_size_check_2 =
+		1 / !!(sizeof(blake2b_param) == sizeof(uint64_t) * CHAR_BIT)
+	};
+
+	// crypto namespace (fixes naming collisions with libsodium)
+#define blake2b_init        crypto_blake2b_init
+#define blake2b_init_key    crypto_blake2b_init_key
+#define blake2b_init_param  crypto_blake2b_init_param
+#define blake2b_update      crypto_blake2b_update
+#define blake2b_final       crypto_blake2b_final
+#define blake2b             crypto_blake2b
+#define blake2b_long        crypto_blake2b_long
+
+	/* Streaming API */
+	int blake2b_init(blake2b_state *S, size_t outlen);
+	int blake2b_init_key(blake2b_state *S, size_t outlen, const void *key,
+		size_t keylen);
+	int blake2b_init_param(blake2b_state *S, const blake2b_param *P);
+	int blake2b_update(blake2b_state *S, const void *in, size_t inlen);
+	int blake2b_final(blake2b_state *S, void *out, size_t outlen);
+
+	/* Simple API */
+	int blake2b(void *out, size_t outlen, const void *in, size_t inlen,
+		const void *key, size_t keylen);
+
+	/* Argon2 Team - Begin Code */
+	int blake2b_long(void *out, size_t outlen, const void *in, size_t inlen);
+	/* Argon2 Team - End Code */
+
+#if defined(__cplusplus)
+}
+#endif