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author | Gaurav Shah <gauravsh@chromium.org> | 2011-03-29 14:52:30 -0700 |
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committer | Gaurav Shah <gauravsh@chromium.org> | 2011-03-29 14:52:30 -0700 |
commit | a01a62bf85e01e1687ea5132286628b2a760f6d8 (patch) | |
tree | 5f4f46772e46a5fd8a2fc3580da63b05d9f32ae4 | |
parent | cecdcbfe5d3832b4d639845d1fe297187236920c (diff) | |
download | vboot-a01a62bf85e01e1687ea5132286628b2a760f6d8.tar.gz |
Make SHA256_update and SHA512_update if the passed in length is greater than UINT32_MAX
BUG=chrome-os-partner:2912
TEST=make && make runtests
Change-Id: If415a023d47b78ae2fc5af0b2fe5e410ef37086d
Review URL: http://codereview.chromium.org/6750016
-rw-r--r-- | firmware/lib/cryptolib/include/sha.h | 4 | ||||
-rw-r--r-- | firmware/lib/cryptolib/sha2.c | 68 |
2 files changed, 50 insertions, 22 deletions
diff --git a/firmware/lib/cryptolib/include/sha.h b/firmware/lib/cryptolib/include/sha.h index 46e417d9..8beb296b 100644 --- a/firmware/lib/cryptolib/include/sha.h +++ b/firmware/lib/cryptolib/include/sha.h @@ -58,11 +58,11 @@ void SHA1_update(SHA1_CTX* ctx, const uint8_t* data, uint64_t len); uint8_t* SHA1_final(SHA1_CTX* ctx); void SHA256_init(SHA256_CTX* ctx); -void SHA256_update(SHA256_CTX* ctx, const uint8_t* data, uint64_t len); +void SHA256_update(SHA256_CTX* ctx, const uint8_t* data, uint32_t len); uint8_t* SHA256_final(SHA256_CTX* ctx); void SHA512_init(SHA512_CTX* ctx); -void SHA512_update(SHA512_CTX* ctx, const uint8_t* data, uint64_t len); +void SHA512_update(SHA512_CTX* ctx, const uint8_t* data, uint32_t len); uint8_t* SHA512_final(SHA512_CTX* ctx); /* Convenience function for SHA-1. Computes hash on [data] of length [len]. diff --git a/firmware/lib/cryptolib/sha2.c b/firmware/lib/cryptolib/sha2.c index aa269176..d8dce069 100644 --- a/firmware/lib/cryptolib/sha2.c +++ b/firmware/lib/cryptolib/sha2.c @@ -332,22 +332,22 @@ static void SHA256_transform(SHA256_CTX* ctx, const uint8_t* message, -void SHA256_update(SHA256_CTX* ctx, const uint8_t* data, uint64_t len) { +void SHA256_update(SHA256_CTX* ctx, const uint8_t* data, uint32_t len) { unsigned int block_nb; unsigned int new_len, rem_len, tmp_len; const uint8_t *shifted_data; tmp_len = SHA256_BLOCK_SIZE - ctx->len; - rem_len = len < tmp_len ? (unsigned int)len : tmp_len; + rem_len = len < tmp_len ? len : tmp_len; Memcpy(&ctx->block[ctx->len], data, rem_len); if (ctx->len + len < SHA256_BLOCK_SIZE) { - ctx->len += (uint32_t)len; + ctx->len += len; return; } - new_len = (unsigned int)len - rem_len; + new_len = len - rem_len; block_nb = new_len / SHA256_BLOCK_SIZE; shifted_data = data + rem_len; @@ -424,8 +424,7 @@ void SHA512_init(SHA512_CTX *ctx) { static void SHA512_transform(SHA512_CTX* ctx, const uint8_t* message, - unsigned int block_nb) -{ + unsigned int block_nb) { uint64_t w[80]; uint64_t wv[8]; uint64_t t1, t2; @@ -520,22 +519,22 @@ static void SHA512_transform(SHA512_CTX* ctx, const uint8_t* message, void SHA512_update(SHA512_CTX* ctx, const uint8_t* data, - uint64_t len) { + uint32_t len) { unsigned int block_nb; unsigned int new_len, rem_len, tmp_len; const uint8_t* shifted_data; tmp_len = SHA512_BLOCK_SIZE - ctx->len; - rem_len = len < tmp_len ? (unsigned int)len : tmp_len; + rem_len = len < tmp_len ? len : tmp_len; Memcpy(&ctx->block[ctx->len], data, rem_len); if (ctx->len + len < SHA512_BLOCK_SIZE) { - ctx->len += (uint32_t)len; + ctx->len += len; return; } - new_len = (unsigned int)len - rem_len; + new_len = len - rem_len; block_nb = new_len / SHA512_BLOCK_SIZE; shifted_data = data + rem_len; @@ -593,31 +592,60 @@ uint8_t* SHA512_final(SHA512_CTX* ctx) } - -/* Convenient functions. */ uint8_t* SHA256(const uint8_t* data, uint64_t len, uint8_t* digest) { - const uint8_t* p; + const uint8_t* input_ptr; + const uint8_t* result; + uint64_t remaining_len; int i; SHA256_CTX ctx; + SHA256_init(&ctx); - SHA256_update(&ctx, data, len); - p = SHA256_final(&ctx); + + input_ptr = data; + remaining_len = len; + + /* Process data in at most UINT32_MAX byte chunks at a time. */ + while (remaining_len) { + uint32_t block_size; + block_size = (uint32_t) ((remaining_len >= UINT32_MAX) ? + UINT32_MAX : remaining_len); + SHA256_update(&ctx, input_ptr, block_size); + remaining_len -= block_size; + input_ptr += block_size; + } + + result = SHA256_final(&ctx); for (i = 0; i < SHA256_DIGEST_SIZE; ++i) { - digest[i] = *p++; + digest[i] = *result++; } return digest; } uint8_t* SHA512(const uint8_t* data, uint64_t len, uint8_t* digest) { - const uint8_t* p; + const uint8_t* input_ptr; + const uint8_t* result; + uint64_t remaining_len; int i; SHA512_CTX ctx; SHA512_init(&ctx); - SHA512_update(&ctx, data, len); - p = SHA512_final(&ctx); + + input_ptr = data; + remaining_len = len; + + /* Process data in at most UINT32_MAX byte chunks at a time. */ + while (remaining_len) { + uint32_t block_size; + block_size = (uint32_t) ((remaining_len >= UINT32_MAX) ? + UINT32_MAX : remaining_len); + SHA512_update(&ctx, input_ptr, block_size); + remaining_len -= block_size; + input_ptr += block_size; + } + + result = SHA512_final(&ctx); for (i = 0; i < SHA512_DIGEST_SIZE; ++i) { - digest[i] = *p++; + digest[i] = *result++; } return digest; } |