// SPDX-License-Identifier: GPL-2.0-or-later/* * 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/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>#include "fips-sha.h" 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_ctx initial_sha256_ctx = { .ctx = { .state = { .h = { SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3, SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7, }, }, .bytecount = 0, },}; #define sha256_iv (initial_sha256_ctx.ctx.state) 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_unusedsha256_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 void __sha256_init(struct __sha256_ctx *ctx, const struct sha256_block_state *iv, u64 initial_bytecount){ ctx->state = *iv; ctx->bytecount = initial_bytecount;} void sha224_init(struct sha224_ctx *ctx){ __sha256_init(&ctx->ctx, &sha224_iv, 0);}EXPORT_SYMBOL_GPL(sha224_init); void sha256_init(struct sha256_ctx *ctx){ __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; 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); static void __sha256_final(struct __sha256_ctx *ctx, u8 *out, size_t digest_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); for (size_t i = 0; i < digest_size; i += 4) put_unaligned_be32(ctx->state.h[i / 4], out + i);} void sha224_final(struct sha224_ctx *ctx, u8 out[SHA224_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(const u8 *data, size_t len, u8 out[SHA224_DIGEST_SIZE]){ struct sha224_ctx ctx; sha224_init(&ctx); sha224_update(&ctx, data, len); sha224_final(&ctx, out);}EXPORT_SYMBOL(sha224); void sha256(const u8 *data, size_t len, u8 out[SHA256_DIGEST_SIZE]){ struct sha256_ctx ctx; sha256_init(&ctx); sha256_update(&ctx, data, len); sha256_final(&ctx, out);}EXPORT_SYMBOL(sha256); /* * Pre-boot environments (as indicated by __DISABLE_EXPORTS being defined) just * need the generic SHA-256 code. Omit all other features from them. */#ifndef __DISABLE_EXPORTS #ifndef sha256_finup_2x_archstatic bool sha256_finup_2x_arch(const struct __sha256_ctx *ctx, const u8 *data1, const u8 *data2, size_t len, u8 out1[SHA256_DIGEST_SIZE], u8 out2[SHA256_DIGEST_SIZE]){ return false;}static bool sha256_finup_2x_is_optimized_arch(void){ return false;}#endif /* Sequential fallback implementation of sha256_finup_2x() */static noinline_for_stack void sha256_finup_2x_sequential( const struct __sha256_ctx *ctx, const u8 *data1, const u8 *data2, size_t len, u8 out1[SHA256_DIGEST_SIZE], u8 out2[SHA256_DIGEST_SIZE]){ struct __sha256_ctx mut_ctx; mut_ctx = *ctx; __sha256_update(&mut_ctx, data1, len); __sha256_final(&mut_ctx, out1, SHA256_DIGEST_SIZE); mut_ctx = *ctx; __sha256_update(&mut_ctx, data2, len); __sha256_final(&mut_ctx, out2, SHA256_DIGEST_SIZE);} void sha256_finup_2x(const struct sha256_ctx *ctx, const u8 *data1, const u8 *data2, size_t len, u8 out1[SHA256_DIGEST_SIZE], u8 out2[SHA256_DIGEST_SIZE]){ if (ctx == NULL) ctx = &initial_sha256_ctx; if (likely(sha256_finup_2x_arch(&ctx->ctx, data1, data2, len, out1, out2))) return; sha256_finup_2x_sequential(&ctx->ctx, data1, data2, len, out1, out2);}EXPORT_SYMBOL_GPL(sha256_finup_2x); bool sha256_finup_2x_is_optimized(void){ return sha256_finup_2x_is_optimized_arch();}EXPORT_SYMBOL_GPL(sha256_finup_2x_is_optimized); 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); #if defined(sha256_mod_init_arch) || defined(CONFIG_CRYPTO_FIPS)static int __init sha256_mod_init(void){#ifdef sha256_mod_init_arch sha256_mod_init_arch();#endif if (fips_enabled) { /* * FIPS cryptographic algorithm self-test. As per the FIPS * Implementation Guidance, testing HMAC-SHA256 satisfies the * test requirement for SHA-224, SHA-256, and HMAC-SHA224 too. */ u8 mac[SHA256_DIGEST_SIZE]; hmac_sha256_usingrawkey(fips_test_key, sizeof(fips_test_key), fips_test_data, sizeof(fips_test_data), mac); if (memcmp(fips_test_hmac_sha256_value, mac, sizeof(mac)) != 0) panic("sha256: FIPS self-test failed\n");Lines 1–500 of 515. Load more
// SPDX-License-Identifier: GPL-2.0-or-later /* * 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/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> #include "fips-sha.h" 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_ctx initial_sha256_ctx = { .ctx = { .state = { .h = { SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3, SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7, }, }, .bytecount = 0, }, }; #define sha256_iv (initial_sha256_ctx.ctx.state) 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 void __sha256_init(struct __sha256_ctx *ctx, const struct sha256_block_state *iv, u64 initial_bytecount) { ctx->state = *iv; ctx->bytecount = initial_bytecount; } void sha224_init(struct sha224_ctx *ctx) { __sha256_init(&ctx->ctx, &sha224_iv, 0); } EXPORT_SYMBOL_GPL(sha224_init); void sha256_init(struct sha256_ctx *ctx) { __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; 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); static void __sha256_final(struct __sha256_ctx *ctx, u8 *out, size_t digest_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); for (size_t i = 0; i < digest_size; i += 4) put_unaligned_be32(ctx->state.h[i / 4], out + i); } void sha224_final(struct sha224_ctx *ctx, u8 out[SHA224_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(const u8 *data, size_t len, u8 out[SHA224_DIGEST_SIZE]) { struct sha224_ctx ctx; sha224_init(&ctx); sha224_update(&ctx, data, len); sha224_final(&ctx, out); } EXPORT_SYMBOL(sha224); void sha256(const u8 *data, size_t len, u8 out[SHA256_DIGEST_SIZE]) { struct sha256_ctx ctx; sha256_init(&ctx); sha256_update(&ctx, data, len); sha256_final(&ctx, out); } EXPORT_SYMBOL(sha256); /* * Pre-boot environments (as indicated by __DISABLE_EXPORTS being defined) just * need the generic SHA-256 code. Omit all other features from them. */ #ifndef __DISABLE_EXPORTS #ifndef sha256_finup_2x_arch static bool sha256_finup_2x_arch(const struct __sha256_ctx *ctx, const u8 *data1, const u8 *data2, size_t len, u8 out1[SHA256_DIGEST_SIZE], u8 out2[SHA256_DIGEST_SIZE]) { return false; } static bool sha256_finup_2x_is_optimized_arch(void) { return false; } #endif /* Sequential fallback implementation of sha256_finup_2x() */ static noinline_for_stack void sha256_finup_2x_sequential( const struct __sha256_ctx *ctx, const u8 *data1, const u8 *data2, size_t len, u8 out1[SHA256_DIGEST_SIZE], u8 out2[SHA256_DIGEST_SIZE]) { struct __sha256_ctx mut_ctx; mut_ctx = *ctx; __sha256_update(&mut_ctx, data1, len); __sha256_final(&mut_ctx, out1, SHA256_DIGEST_SIZE); mut_ctx = *ctx; __sha256_update(&mut_ctx, data2, len); __sha256_final(&mut_ctx, out2, SHA256_DIGEST_SIZE); } void sha256_finup_2x(const struct sha256_ctx *ctx, const u8 *data1, const u8 *data2, size_t len, u8 out1[SHA256_DIGEST_SIZE], u8 out2[SHA256_DIGEST_SIZE]) { if (ctx == NULL) ctx = &initial_sha256_ctx; if (likely(sha256_finup_2x_arch(&ctx->ctx, data1, data2, len, out1, out2))) return; sha256_finup_2x_sequential(&ctx->ctx, data1, data2, len, out1, out2); } EXPORT_SYMBOL_GPL(sha256_finup_2x); bool sha256_finup_2x_is_optimized(void) { return sha256_finup_2x_is_optimized_arch(); } EXPORT_SYMBOL_GPL(sha256_finup_2x_is_optimized); 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); #if defined(sha256_mod_init_arch) || defined(CONFIG_CRYPTO_FIPS) static int __init sha256_mod_init(void) { #ifdef sha256_mod_init_arch sha256_mod_init_arch(); #endif if (fips_enabled) { /* * FIPS cryptographic algorithm self-test. As per the FIPS * Implementation Guidance, testing HMAC-SHA256 satisfies the * test requirement for SHA-224, SHA-256, and HMAC-SHA224 too. */ u8 mac[SHA256_DIGEST_SIZE]; hmac_sha256_usingrawkey(fips_test_key, sizeof(fips_test_key), fips_test_data, sizeof(fips_test_data), mac); if (memcmp(fips_test_hmac_sha256_value, mac, sizeof(mac)) != 0) panic("sha256: FIPS self-test failed\n");