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Diffstat (limited to 'board/cr50/dcrypto/sha1.c')
-rw-r--r-- | board/cr50/dcrypto/sha1.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/board/cr50/dcrypto/sha1.c b/board/cr50/dcrypto/sha1.c new file mode 100644 index 0000000000..07ef3a34ef --- /dev/null +++ b/board/cr50/dcrypto/sha1.c @@ -0,0 +1,65 @@ +/* Copyright 2015 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "dcrypto.h" +#include "internal.h" +#include "registers.h" + +#include "cryptoc/sha.h" + +static void dcrypto_sha1_init(SHA_CTX *ctx); +static const uint8_t *dcrypto_sha1_final(SHA_CTX *unused); + +/* + * Hardware SHA implementation. + */ +static const HASH_VTAB HW_SHA1_VTAB = { + dcrypto_sha1_init, + dcrypto_sha_update, + dcrypto_sha1_final, + DCRYPTO_SHA1_hash, + SHA_DIGEST_SIZE +}; + +/* Requires dcrypto_grab_sha_hw() to be called first. */ +static void dcrypto_sha1_init(SHA_CTX *ctx) +{ + ctx->f = &HW_SHA1_VTAB; + dcrypto_sha_init(SHA1_MODE); +} + +/* Select and initialize either the software or hardware + * implementation. If "multi-threaded" behaviour is required, then + * callers must set sw_required to 1. This is because SHA1 state + * internal to the hardware cannot be extracted, so it is not possible + * to suspend and resume a hardware based SHA operation. + * + * If the caller has no preference as to implementation, then hardware + * is preferred based on availability. Hardware is considered to be + * in use between init() and finished() calls. */ +void DCRYPTO_SHA1_init(SHA_CTX *ctx, uint32_t sw_required) +{ + if (!sw_required && dcrypto_grab_sha_hw()) + dcrypto_sha1_init(ctx); + else + SHA_init(ctx); +} + +static const uint8_t *dcrypto_sha1_final(SHA_CTX *ctx) +{ + dcrypto_sha_wait(SHA1_MODE, (uint32_t *) ctx->buf); + return ctx->buf; +} + +const uint8_t *DCRYPTO_SHA1_hash(const void *data, uint32_t n, + uint8_t *digest) +{ + if (dcrypto_grab_sha_hw()) + /* dcrypto_sha_wait() will release the hw. */ + dcrypto_sha_hash(SHA1_MODE, data, n, digest); + else + SHA_hash(data, n, digest); + return digest; +} |