Add support for SHA384 and SHA512

The current recommendation for best security practice from the US government
is to use SHA384 for TOP SECRET [1].

This patch adds support for SHA384 and SHA512 in the hash command, and also
allows FIT images to be hashed with these algorithms, and signed with
sha384,rsaXXXX and sha512,rsaXXXX

The SHA implementation is adapted from the linux kernel implementation.

[1] Commercial National Security Algorithm Suite
http://www.iad.gov/iad/programs/iad-initiatives/cnsa-suite.cfm

Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>

1 files changed, 383 insertions, 0 deletions

diff --git a/lib/sha512.c b/lib/sha512.c
new file mode 100644
index 0000000000..f1e2acf0fb
--- /dev/null
+++ b/lib/sha512.c
@@ -0,0 +1,383 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * FIPS-180-2 compliant SHA-512 and SHA-384 implementation
+ *
+ * SHA-512 code by Jean-Luc Cooke <jlcooke@certainkey.com>
+ *
+ * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
+ * Copyright (c) 2020 Reuben Dowle <reuben.dowle@4rf.com>
+ */
+
+#ifndef USE_HOSTCC
+#include <common.h>
+#include <linux/string.h>
+#else
+#include <string.h>
+#endif /* USE_HOSTCC */
+#include <watchdog.h>
+#include <u-boot/sha512.h>
+
+const uint8_t sha384_der_prefix[SHA384_DER_LEN] = {
+	0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+	0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05,
+	0x00, 0x04, 0x30
+};
+
+const uint8_t sha512_der_prefix[SHA512_DER_LEN] = {
+	0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
+	0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
+	0x00, 0x04, 0x40
+};
+
+#define SHA384_H0	0xcbbb9d5dc1059ed8ULL
+#define SHA384_H1	0x629a292a367cd507ULL
+#define SHA384_H2	0x9159015a3070dd17ULL
+#define SHA384_H3	0x152fecd8f70e5939ULL
+#define SHA384_H4	0x67332667ffc00b31ULL
+#define SHA384_H5	0x8eb44a8768581511ULL
+#define SHA384_H6	0xdb0c2e0d64f98fa7ULL
+#define SHA384_H7	0x47b5481dbefa4fa4ULL
+
+#define SHA512_H0	0x6a09e667f3bcc908ULL
+#define SHA512_H1	0xbb67ae8584caa73bULL
+#define SHA512_H2	0x3c6ef372fe94f82bULL
+#define SHA512_H3	0xa54ff53a5f1d36f1ULL
+#define SHA512_H4	0x510e527fade682d1ULL
+#define SHA512_H5	0x9b05688c2b3e6c1fULL
+#define SHA512_H6	0x1f83d9abfb41bd6bULL
+#define SHA512_H7	0x5be0cd19137e2179ULL
+
+static inline uint64_t Ch(uint64_t x, uint64_t y, uint64_t z)
+{
+        return z ^ (x & (y ^ z));
+}
+
+static inline uint64_t Maj(uint64_t x, uint64_t y, uint64_t z)
+{
+        return (x & y) | (z & (x | y));
+}
+
+static const uint64_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,
+};
+
+static inline uint64_t ror64(uint64_t word, unsigned int shift)
+{
+	return (word >> (shift & 63)) | (word << ((-shift) & 63));
+}
+
+#define e0(x)       (ror64(x,28) ^ ror64(x,34) ^ ror64(x,39))
+#define e1(x)       (ror64(x,14) ^ ror64(x,18) ^ ror64(x,41))
+#define s0(x)       (ror64(x, 1) ^ ror64(x, 8) ^ (x >> 7))
+#define s1(x)       (ror64(x,19) ^ ror64(x,61) ^ (x >> 6))
+
+/*
+ * 64-bit integer manipulation macros (big endian)
+ */
+#ifndef GET_UINT64_BE
+#define GET_UINT64_BE(n,b,i) {				\
+	(n) = ( (unsigned long long) (b)[(i)    ] << 56 )	\
+	    | ( (unsigned long long) (b)[(i) + 1] << 48 )	\
+	    | ( (unsigned long long) (b)[(i) + 2] << 40 )	\
+	    | ( (unsigned long long) (b)[(i) + 3] << 32 )	\
+	    | ( (unsigned long long) (b)[(i) + 4] << 24 )	\
+	    | ( (unsigned long long) (b)[(i) + 5] << 16 )	\
+	    | ( (unsigned long long) (b)[(i) + 6] <<  8 )	\
+	    | ( (unsigned long long) (b)[(i) + 7]       );	\
+}
+#endif
+#ifndef PUT_UINT64_BE
+#define PUT_UINT64_BE(n,b,i) {				\
+	(b)[(i)    ] = (unsigned char) ( (n) >> 56 );	\
+	(b)[(i) + 1] = (unsigned char) ( (n) >> 48 );	\
+	(b)[(i) + 2] = (unsigned char) ( (n) >> 40 );	\
+	(b)[(i) + 3] = (unsigned char) ( (n) >> 32 );	\
+	(b)[(i) + 4] = (unsigned char) ( (n) >> 24 );	\
+	(b)[(i) + 5] = (unsigned char) ( (n) >> 16 );	\
+	(b)[(i) + 6] = (unsigned char) ( (n) >>  8 );	\
+	(b)[(i) + 7] = (unsigned char) ( (n)       );	\
+}
+#endif
+
+static inline void LOAD_OP(int I, uint64_t *W, const uint8_t *input)
+{
+	GET_UINT64_BE(W[I], input, I*8);
+}
+
+static inline void BLEND_OP(int I, uint64_t *W)
+{
+	W[I & 15] += s1(W[(I-2) & 15]) + W[(I-7) & 15] + s0(W[(I-15) & 15]);
+}
+
+static void
+sha512_transform(uint64_t *state, const uint8_t *input)
+{
+	uint64_t a, b, c, d, e, f, g, h, t1, t2;
+
+	int i;
+	uint64_t W[16];
+
+	/* load the state into our registers */
+	a=state[0];   b=state[1];   c=state[2];   d=state[3];
+	e=state[4];   f=state[5];   g=state[6];   h=state[7];
+
+	/* now iterate */
+	for (i=0; i<80; i+=8) {
+		if (!(i & 8)) {
+			int j;
+
+			if (i < 16) {
+				/* load the input */
+				for (j = 0; j < 16; j++)
+					LOAD_OP(i + j, W, input);
+			} else {
+				for (j = 0; j < 16; j++) {
+					BLEND_OP(i + j, W);
+				}
+			}
+		}
+
+		t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[(i & 15)];
+		t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+		t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[(i & 15) + 1];
+		t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+		t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[(i & 15) + 2];
+		t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+		t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[(i & 15) + 3];
+		t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+		t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[(i & 15) + 4];
+		t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+		t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[(i & 15) + 5];
+		t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+		t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[(i & 15) + 6];
+		t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+		t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[(i & 15) + 7];
+		t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+	}
+
+	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
+	state[4] += e; state[5] += f; state[6] += g; state[7] += h;
+
+	/* erase our data */
+	a = b = c = d = e = f = g = h = t1 = t2 = 0;
+}
+
+static void sha512_block_fn(sha512_context *sst, const uint8_t *src,
+				    int blocks)
+{
+	while (blocks--) {
+		sha512_transform(sst->state, src);
+		src += SHA512_BLOCK_SIZE;
+	}
+}
+
+static void sha512_base_do_update(sha512_context *sctx,
+					const uint8_t *data,
+					unsigned int len)
+{
+	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
+
+	sctx->count[0] += len;
+	if (sctx->count[0] < len)
+		sctx->count[1]++;
+
+	if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
+		int blocks;
+
+		if (partial) {
+			int p = SHA512_BLOCK_SIZE - partial;
+
+			memcpy(sctx->buf + partial, data, p);
+			data += p;
+			len -= p;
+
+			sha512_block_fn(sctx, sctx->buf, 1);
+		}
+
+		blocks = len / SHA512_BLOCK_SIZE;
+		len %= SHA512_BLOCK_SIZE;
+
+		if (blocks) {
+			sha512_block_fn(sctx, data, blocks);
+			data += blocks * SHA512_BLOCK_SIZE;
+		}
+		partial = 0;
+	}
+	if (len)
+		memcpy(sctx->buf + partial, data, len);
+}
+
+static void sha512_base_do_finalize(sha512_context *sctx)
+{
+	const int bit_offset = SHA512_BLOCK_SIZE - sizeof(uint64_t[2]);
+	uint64_t *bits = (uint64_t *)(sctx->buf + bit_offset);
+	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
+
+	sctx->buf[partial++] = 0x80;
+	if (partial > bit_offset) {
+		memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
+		partial = 0;
+
+		sha512_block_fn(sctx, sctx->buf, 1);
+	}
+
+	memset(sctx->buf + partial, 0x0, bit_offset - partial);
+	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
+	bits[1] = cpu_to_be64(sctx->count[0] << 3);
+	sha512_block_fn(sctx, sctx->buf, 1);
+}
+
+#if defined(CONFIG_SHA384)
+void sha384_starts(sha512_context * ctx)
+{
+	ctx->state[0] = SHA384_H0;
+	ctx->state[1] = SHA384_H1;
+	ctx->state[2] = SHA384_H2;
+	ctx->state[3] = SHA384_H3;
+	ctx->state[4] = SHA384_H4;
+	ctx->state[5] = SHA384_H5;
+	ctx->state[6] = SHA384_H6;
+	ctx->state[7] = SHA384_H7;
+	ctx->count[0] = ctx->count[1] = 0;
+}
+
+void sha384_update(sha512_context *ctx, const uint8_t *input, uint32_t length)
+{
+	sha512_base_do_update(ctx, input, length);
+}
+
+void sha384_finish(sha512_context * ctx, uint8_t digest[SHA384_SUM_LEN])
+{
+	int i;
+
+	sha512_base_do_finalize(ctx);
+	for(i=0; i<SHA384_SUM_LEN / sizeof(uint64_t); i++)
+		PUT_UINT64_BE(ctx->state[i], digest, i * 8);
+}
+
+/*
+ * Output = SHA-512( input buffer ). Trigger the watchdog every 'chunk_sz'
+ * bytes of input processed.
+ */
+void sha384_csum_wd(const unsigned char *input, unsigned int ilen,
+		unsigned char *output, unsigned int chunk_sz)
+{
+	sha512_context ctx;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	const unsigned char *end;
+	unsigned char *curr;
+	int chunk;
+#endif
+
+	sha384_starts(&ctx);
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	curr = (unsigned char *)input;
+	end = input + ilen;
+	while (curr < end) {
+		chunk = end - curr;
+		if (chunk > chunk_sz)
+			chunk = chunk_sz;
+		sha384_update(&ctx, curr, chunk);
+		curr += chunk;
+		WATCHDOG_RESET();
+	}
+#else
+	sha384_update(&ctx, input, ilen);
+#endif
+
+	sha384_finish(&ctx, output);
+}
+
+#endif
+
+#if defined(CONFIG_SHA512)
+void sha512_starts(sha512_context * ctx)
+{
+	ctx->state[0] = SHA512_H0;
+	ctx->state[1] = SHA512_H1;
+	ctx->state[2] = SHA512_H2;
+	ctx->state[3] = SHA512_H3;
+	ctx->state[4] = SHA512_H4;
+	ctx->state[5] = SHA512_H5;
+	ctx->state[6] = SHA512_H6;
+	ctx->state[7] = SHA512_H7;
+	ctx->count[0] = ctx->count[1] = 0;
+}
+
+void sha512_update(sha512_context *ctx, const uint8_t *input, uint32_t length)
+{
+	sha512_base_do_update(ctx, input, length);
+}
+
+void sha512_finish(sha512_context * ctx, uint8_t digest[SHA512_SUM_LEN])
+{
+	int i;
+
+	sha512_base_do_finalize(ctx);
+	for(i=0; i<SHA512_SUM_LEN / sizeof(uint64_t); i++)
+		PUT_UINT64_BE(ctx->state[i], digest, i * 8);
+}
+
+/*
+ * Output = SHA-512( input buffer ). Trigger the watchdog every 'chunk_sz'
+ * bytes of input processed.
+ */
+void sha512_csum_wd(const unsigned char *input, unsigned int ilen,
+		unsigned char *output, unsigned int chunk_sz)
+{
+	sha512_context ctx;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	const unsigned char *end;
+	unsigned char *curr;
+	int chunk;
+#endif
+
+	sha512_starts(&ctx);
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	curr = (unsigned char *)input;
+	end = input + ilen;
+	while (curr < end) {
+		chunk = end - curr;
+		if (chunk > chunk_sz)
+			chunk = chunk_sz;
+		sha512_update(&ctx, curr, chunk);
+		curr += chunk;
+		WATCHDOG_RESET();
+	}
+#else
+	sha512_update(&ctx, input, ilen);
+#endif
+
+	sha512_finish(&ctx, output);
+}
+#endif