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-rw-r--r--lib/crypto/sha256.c433
1 files changed, 393 insertions, 40 deletions
diff --git a/lib/crypto/sha256.c b/lib/crypto/sha256.c
index 107e5162507a..8fa15165d23e 100644
--- a/lib/crypto/sha256.c
+++ b/lib/crypto/sha256.c
@@ -1,83 +1,436 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
- * SHA-256, as specified in
- * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
- *
- * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
+ * SHA-224, SHA-256, HMAC-SHA224, and HMAC-SHA256 library functions
*
* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2014 Red Hat Inc.
+ * Copyright 2025 Google LLC
*/
-#include <crypto/internal/blockhash.h>
-#include <crypto/internal/sha2.h>
+#include <crypto/hmac.h>
+#include <crypto/sha2.h>
+#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
+#include <linux/unaligned.h>
+#include <linux/wordpart.h>
-/*
- * If __DISABLE_EXPORTS is defined, then this file is being compiled for a
- * pre-boot environment. In that case, ignore the kconfig options, pull the
- * generic code into the same translation unit, and use that only.
- */
-#ifdef __DISABLE_EXPORTS
-#include "sha256-generic.c"
+static const struct sha256_block_state sha224_iv = {
+ .h = {
+ SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
+ SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
+ },
+};
+
+static const struct sha256_block_state sha256_iv = {
+ .h = {
+ SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
+ SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
+ },
+};
+
+static const u32 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,
+};
+
+#define Ch(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
+#define Maj(x, y, z) (((x) & (y)) | ((z) & ((x) | (y))))
+#define e0(x) (ror32((x), 2) ^ ror32((x), 13) ^ ror32((x), 22))
+#define e1(x) (ror32((x), 6) ^ ror32((x), 11) ^ ror32((x), 25))
+#define s0(x) (ror32((x), 7) ^ ror32((x), 18) ^ ((x) >> 3))
+#define s1(x) (ror32((x), 17) ^ ror32((x), 19) ^ ((x) >> 10))
+
+static inline void LOAD_OP(int I, u32 *W, const u8 *input)
+{
+ W[I] = get_unaligned_be32((__u32 *)input + I);
+}
+
+static inline void BLEND_OP(int I, u32 *W)
+{
+ W[I] = s1(W[I - 2]) + W[I - 7] + s0(W[I - 15]) + W[I - 16];
+}
+
+#define SHA256_ROUND(i, a, b, c, d, e, f, g, h) \
+ do { \
+ u32 t1, t2; \
+ t1 = h + e1(e) + Ch(e, f, g) + sha256_K[i] + W[i]; \
+ t2 = e0(a) + Maj(a, b, c); \
+ d += t1; \
+ h = t1 + t2; \
+ } while (0)
+
+static void sha256_block_generic(struct sha256_block_state *state,
+ const u8 *input, u32 W[64])
+{
+ u32 a, b, c, d, e, f, g, h;
+ int i;
+
+ /* load the input */
+ for (i = 0; i < 16; i += 8) {
+ LOAD_OP(i + 0, W, input);
+ LOAD_OP(i + 1, W, input);
+ LOAD_OP(i + 2, W, input);
+ LOAD_OP(i + 3, W, input);
+ LOAD_OP(i + 4, W, input);
+ LOAD_OP(i + 5, W, input);
+ LOAD_OP(i + 6, W, input);
+ LOAD_OP(i + 7, W, input);
+ }
+
+ /* now blend */
+ for (i = 16; i < 64; i += 8) {
+ BLEND_OP(i + 0, W);
+ BLEND_OP(i + 1, W);
+ BLEND_OP(i + 2, W);
+ BLEND_OP(i + 3, W);
+ BLEND_OP(i + 4, W);
+ BLEND_OP(i + 5, W);
+ BLEND_OP(i + 6, W);
+ BLEND_OP(i + 7, W);
+ }
+
+ /* load the state into our registers */
+ a = state->h[0];
+ b = state->h[1];
+ c = state->h[2];
+ d = state->h[3];
+ e = state->h[4];
+ f = state->h[5];
+ g = state->h[6];
+ h = state->h[7];
+
+ /* now iterate */
+ for (i = 0; i < 64; i += 8) {
+ SHA256_ROUND(i + 0, a, b, c, d, e, f, g, h);
+ SHA256_ROUND(i + 1, h, a, b, c, d, e, f, g);
+ SHA256_ROUND(i + 2, g, h, a, b, c, d, e, f);
+ SHA256_ROUND(i + 3, f, g, h, a, b, c, d, e);
+ SHA256_ROUND(i + 4, e, f, g, h, a, b, c, d);
+ SHA256_ROUND(i + 5, d, e, f, g, h, a, b, c);
+ SHA256_ROUND(i + 6, c, d, e, f, g, h, a, b);
+ SHA256_ROUND(i + 7, b, c, d, e, f, g, h, a);
+ }
+
+ state->h[0] += a;
+ state->h[1] += b;
+ state->h[2] += c;
+ state->h[3] += d;
+ state->h[4] += e;
+ state->h[5] += f;
+ state->h[6] += g;
+ state->h[7] += h;
+}
+
+static void __maybe_unused
+sha256_blocks_generic(struct sha256_block_state *state,
+ const u8 *data, size_t nblocks)
+{
+ u32 W[64];
+
+ do {
+ sha256_block_generic(state, data, W);
+ data += SHA256_BLOCK_SIZE;
+ } while (--nblocks);
+
+ memzero_explicit(W, sizeof(W));
+}
+
+#if defined(CONFIG_CRYPTO_LIB_SHA256_ARCH) && !defined(__DISABLE_EXPORTS)
+#include "sha256.h" /* $(SRCARCH)/sha256.h */
+#else
+#define sha256_blocks sha256_blocks_generic
#endif
-static inline bool sha256_purgatory(void)
+static void __sha256_init(struct __sha256_ctx *ctx,
+ const struct sha256_block_state *iv,
+ u64 initial_bytecount)
{
- return __is_defined(__DISABLE_EXPORTS);
+ ctx->state = *iv;
+ ctx->bytecount = initial_bytecount;
}
-static inline void sha256_blocks(u32 state[SHA256_STATE_WORDS], const u8 *data,
- size_t nblocks)
+void sha224_init(struct sha224_ctx *ctx)
{
- sha256_choose_blocks(state, data, nblocks, sha256_purgatory(), false);
+ __sha256_init(&ctx->ctx, &sha224_iv, 0);
}
+EXPORT_SYMBOL_GPL(sha224_init);
-void sha256_update(struct sha256_state *sctx, const u8 *data, size_t len)
+void sha256_init(struct sha256_ctx *ctx)
{
- size_t partial = sctx->count % SHA256_BLOCK_SIZE;
+ __sha256_init(&ctx->ctx, &sha256_iv, 0);
+}
+EXPORT_SYMBOL_GPL(sha256_init);
+
+void __sha256_update(struct __sha256_ctx *ctx, const u8 *data, size_t len)
+{
+ size_t partial = ctx->bytecount % SHA256_BLOCK_SIZE;
+
+ ctx->bytecount += len;
+
+ if (partial + len >= SHA256_BLOCK_SIZE) {
+ size_t nblocks;
- sctx->count += len;
- BLOCK_HASH_UPDATE_BLOCKS(sha256_blocks, sctx->ctx.state, data, len,
- SHA256_BLOCK_SIZE, sctx->buf, partial);
+ if (partial) {
+ size_t l = SHA256_BLOCK_SIZE - partial;
+
+ memcpy(&ctx->buf[partial], data, l);
+ data += l;
+ len -= l;
+
+ sha256_blocks(&ctx->state, ctx->buf, 1);
+ }
+
+ nblocks = len / SHA256_BLOCK_SIZE;
+ len %= SHA256_BLOCK_SIZE;
+
+ if (nblocks) {
+ sha256_blocks(&ctx->state, data, nblocks);
+ data += nblocks * SHA256_BLOCK_SIZE;
+ }
+ partial = 0;
+ }
+ if (len)
+ memcpy(&ctx->buf[partial], data, len);
}
-EXPORT_SYMBOL(sha256_update);
+EXPORT_SYMBOL(__sha256_update);
-static inline void __sha256_final(struct sha256_state *sctx, u8 *out,
- size_t digest_size)
+static void __sha256_final(struct __sha256_ctx *ctx,
+ u8 *out, size_t digest_size)
{
- size_t partial = sctx->count % SHA256_BLOCK_SIZE;
+ u64 bitcount = ctx->bytecount << 3;
+ size_t partial = ctx->bytecount % SHA256_BLOCK_SIZE;
+
+ ctx->buf[partial++] = 0x80;
+ if (partial > SHA256_BLOCK_SIZE - 8) {
+ memset(&ctx->buf[partial], 0, SHA256_BLOCK_SIZE - partial);
+ sha256_blocks(&ctx->state, ctx->buf, 1);
+ partial = 0;
+ }
+ memset(&ctx->buf[partial], 0, SHA256_BLOCK_SIZE - 8 - partial);
+ *(__be64 *)&ctx->buf[SHA256_BLOCK_SIZE - 8] = cpu_to_be64(bitcount);
+ sha256_blocks(&ctx->state, ctx->buf, 1);
- sha256_finup(&sctx->ctx, sctx->buf, partial, out, digest_size,
- sha256_purgatory(), false);
- memzero_explicit(sctx, sizeof(*sctx));
+ for (size_t i = 0; i < digest_size; i += 4)
+ put_unaligned_be32(ctx->state.h[i / 4], out + i);
}
-void sha256_final(struct sha256_state *sctx, u8 out[SHA256_DIGEST_SIZE])
+void sha224_final(struct sha224_ctx *ctx, u8 out[SHA224_DIGEST_SIZE])
{
- __sha256_final(sctx, out, SHA256_DIGEST_SIZE);
+ __sha256_final(&ctx->ctx, out, SHA224_DIGEST_SIZE);
+ memzero_explicit(ctx, sizeof(*ctx));
+}
+EXPORT_SYMBOL(sha224_final);
+
+void sha256_final(struct sha256_ctx *ctx, u8 out[SHA256_DIGEST_SIZE])
+{
+ __sha256_final(&ctx->ctx, out, SHA256_DIGEST_SIZE);
+ memzero_explicit(ctx, sizeof(*ctx));
}
EXPORT_SYMBOL(sha256_final);
-void sha224_final(struct sha256_state *sctx, u8 out[SHA224_DIGEST_SIZE])
+void sha224(const u8 *data, size_t len, u8 out[SHA224_DIGEST_SIZE])
{
- __sha256_final(sctx, out, SHA224_DIGEST_SIZE);
+ struct sha224_ctx ctx;
+
+ sha224_init(&ctx);
+ sha224_update(&ctx, data, len);
+ sha224_final(&ctx, out);
}
-EXPORT_SYMBOL(sha224_final);
+EXPORT_SYMBOL(sha224);
void sha256(const u8 *data, size_t len, u8 out[SHA256_DIGEST_SIZE])
{
- struct sha256_state sctx;
+ struct sha256_ctx ctx;
- sha256_init(&sctx);
- sha256_update(&sctx, data, len);
- sha256_final(&sctx, out);
+ sha256_init(&ctx);
+ sha256_update(&ctx, data, len);
+ sha256_final(&ctx, out);
}
EXPORT_SYMBOL(sha256);
-MODULE_DESCRIPTION("SHA-256 Algorithm");
+/* pre-boot environment (as indicated by __DISABLE_EXPORTS) doesn't need HMAC */
+#ifndef __DISABLE_EXPORTS
+static void __hmac_sha256_preparekey(struct sha256_block_state *istate,
+ struct sha256_block_state *ostate,
+ const u8 *raw_key, size_t raw_key_len,
+ const struct sha256_block_state *iv)
+{
+ union {
+ u8 b[SHA256_BLOCK_SIZE];
+ unsigned long w[SHA256_BLOCK_SIZE / sizeof(unsigned long)];
+ } derived_key = { 0 };
+
+ if (unlikely(raw_key_len > SHA256_BLOCK_SIZE)) {
+ if (iv == &sha224_iv)
+ sha224(raw_key, raw_key_len, derived_key.b);
+ else
+ sha256(raw_key, raw_key_len, derived_key.b);
+ } else {
+ memcpy(derived_key.b, raw_key, raw_key_len);
+ }
+
+ for (size_t i = 0; i < ARRAY_SIZE(derived_key.w); i++)
+ derived_key.w[i] ^= REPEAT_BYTE(HMAC_IPAD_VALUE);
+ *istate = *iv;
+ sha256_blocks(istate, derived_key.b, 1);
+
+ for (size_t i = 0; i < ARRAY_SIZE(derived_key.w); i++)
+ derived_key.w[i] ^= REPEAT_BYTE(HMAC_OPAD_VALUE ^
+ HMAC_IPAD_VALUE);
+ *ostate = *iv;
+ sha256_blocks(ostate, derived_key.b, 1);
+
+ memzero_explicit(&derived_key, sizeof(derived_key));
+}
+
+void hmac_sha224_preparekey(struct hmac_sha224_key *key,
+ const u8 *raw_key, size_t raw_key_len)
+{
+ __hmac_sha256_preparekey(&key->key.istate, &key->key.ostate,
+ raw_key, raw_key_len, &sha224_iv);
+}
+EXPORT_SYMBOL_GPL(hmac_sha224_preparekey);
+
+void hmac_sha256_preparekey(struct hmac_sha256_key *key,
+ const u8 *raw_key, size_t raw_key_len)
+{
+ __hmac_sha256_preparekey(&key->key.istate, &key->key.ostate,
+ raw_key, raw_key_len, &sha256_iv);
+}
+EXPORT_SYMBOL_GPL(hmac_sha256_preparekey);
+
+void __hmac_sha256_init(struct __hmac_sha256_ctx *ctx,
+ const struct __hmac_sha256_key *key)
+{
+ __sha256_init(&ctx->sha_ctx, &key->istate, SHA256_BLOCK_SIZE);
+ ctx->ostate = key->ostate;
+}
+EXPORT_SYMBOL_GPL(__hmac_sha256_init);
+
+void hmac_sha224_init_usingrawkey(struct hmac_sha224_ctx *ctx,
+ const u8 *raw_key, size_t raw_key_len)
+{
+ __hmac_sha256_preparekey(&ctx->ctx.sha_ctx.state, &ctx->ctx.ostate,
+ raw_key, raw_key_len, &sha224_iv);
+ ctx->ctx.sha_ctx.bytecount = SHA256_BLOCK_SIZE;
+}
+EXPORT_SYMBOL_GPL(hmac_sha224_init_usingrawkey);
+
+void hmac_sha256_init_usingrawkey(struct hmac_sha256_ctx *ctx,
+ const u8 *raw_key, size_t raw_key_len)
+{
+ __hmac_sha256_preparekey(&ctx->ctx.sha_ctx.state, &ctx->ctx.ostate,
+ raw_key, raw_key_len, &sha256_iv);
+ ctx->ctx.sha_ctx.bytecount = SHA256_BLOCK_SIZE;
+}
+EXPORT_SYMBOL_GPL(hmac_sha256_init_usingrawkey);
+
+static void __hmac_sha256_final(struct __hmac_sha256_ctx *ctx,
+ u8 *out, size_t digest_size)
+{
+ /* Generate the padded input for the outer hash in ctx->sha_ctx.buf. */
+ __sha256_final(&ctx->sha_ctx, ctx->sha_ctx.buf, digest_size);
+ memset(&ctx->sha_ctx.buf[digest_size], 0,
+ SHA256_BLOCK_SIZE - digest_size);
+ ctx->sha_ctx.buf[digest_size] = 0x80;
+ *(__be32 *)&ctx->sha_ctx.buf[SHA256_BLOCK_SIZE - 4] =
+ cpu_to_be32(8 * (SHA256_BLOCK_SIZE + digest_size));
+
+ /* Compute the outer hash, which gives the HMAC value. */
+ sha256_blocks(&ctx->ostate, ctx->sha_ctx.buf, 1);
+ for (size_t i = 0; i < digest_size; i += 4)
+ put_unaligned_be32(ctx->ostate.h[i / 4], out + i);
+
+ memzero_explicit(ctx, sizeof(*ctx));
+}
+
+void hmac_sha224_final(struct hmac_sha224_ctx *ctx,
+ u8 out[SHA224_DIGEST_SIZE])
+{
+ __hmac_sha256_final(&ctx->ctx, out, SHA224_DIGEST_SIZE);
+}
+EXPORT_SYMBOL_GPL(hmac_sha224_final);
+
+void hmac_sha256_final(struct hmac_sha256_ctx *ctx,
+ u8 out[SHA256_DIGEST_SIZE])
+{
+ __hmac_sha256_final(&ctx->ctx, out, SHA256_DIGEST_SIZE);
+}
+EXPORT_SYMBOL_GPL(hmac_sha256_final);
+
+void hmac_sha224(const struct hmac_sha224_key *key,
+ const u8 *data, size_t data_len, u8 out[SHA224_DIGEST_SIZE])
+{
+ struct hmac_sha224_ctx ctx;
+
+ hmac_sha224_init(&ctx, key);
+ hmac_sha224_update(&ctx, data, data_len);
+ hmac_sha224_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(hmac_sha224);
+
+void hmac_sha256(const struct hmac_sha256_key *key,
+ const u8 *data, size_t data_len, u8 out[SHA256_DIGEST_SIZE])
+{
+ struct hmac_sha256_ctx ctx;
+
+ hmac_sha256_init(&ctx, key);
+ hmac_sha256_update(&ctx, data, data_len);
+ hmac_sha256_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(hmac_sha256);
+
+void hmac_sha224_usingrawkey(const u8 *raw_key, size_t raw_key_len,
+ const u8 *data, size_t data_len,
+ u8 out[SHA224_DIGEST_SIZE])
+{
+ struct hmac_sha224_ctx ctx;
+
+ hmac_sha224_init_usingrawkey(&ctx, raw_key, raw_key_len);
+ hmac_sha224_update(&ctx, data, data_len);
+ hmac_sha224_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(hmac_sha224_usingrawkey);
+
+void hmac_sha256_usingrawkey(const u8 *raw_key, size_t raw_key_len,
+ const u8 *data, size_t data_len,
+ u8 out[SHA256_DIGEST_SIZE])
+{
+ struct hmac_sha256_ctx ctx;
+
+ hmac_sha256_init_usingrawkey(&ctx, raw_key, raw_key_len);
+ hmac_sha256_update(&ctx, data, data_len);
+ hmac_sha256_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(hmac_sha256_usingrawkey);
+#endif /* !__DISABLE_EXPORTS */
+
+#ifdef sha256_mod_init_arch
+static int __init sha256_mod_init(void)
+{
+ sha256_mod_init_arch();
+ return 0;
+}
+subsys_initcall(sha256_mod_init);
+
+static void __exit sha256_mod_exit(void)
+{
+}
+module_exit(sha256_mod_exit);
+#endif
+
+MODULE_DESCRIPTION("SHA-224, SHA-256, HMAC-SHA224, and HMAC-SHA256 library functions");
MODULE_LICENSE("GPL");
generated by cgit (git 2.34.1) at 2025-07-29 21:08:56 +0000