1 | /* Copyright (c) (2010,2011,2014-2016,2018,2019,2021) Apple Inc. All rights reserved. |
2 | * |
3 | * corecrypto is licensed under Apple Inc.’s Internal Use License Agreement (which |
4 | * is contained in the License.txt file distributed with corecrypto) and only to |
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13 | * This file contains Original Code and/or Modifications of Original Code |
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15 | * Version 2.0 (the 'License'). You may not use this file except in |
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34 | */ |
35 | |
36 | #include "cc_internal.h" |
37 | #include <corecrypto/ccdigest.h> |
38 | #include <corecrypto/cc_priv.h> |
39 | |
40 | void |
41 | ccdigest_update(const struct ccdigest_info *di, ccdigest_ctx_t ctx, size_t len, const void *data) |
42 | { |
43 | CC_ENSURE_DIT_ENABLED |
44 | |
45 | const char * data_ptr = data; |
46 | size_t nblocks, nbytes; |
47 | |
48 | // Sanity check to recover from ctx corruptions. |
49 | if (ccdigest_num(di, ctx) >= di->block_size) { |
50 | ccdigest_num(di, ctx) = 0; |
51 | } |
52 | |
53 | while (len > 0) { |
54 | if (ccdigest_num(di, ctx) == 0 && len > di->block_size) { |
55 | if (di->block_size == 1 << 6) { // md5 & sha1 & sha256 |
56 | nblocks = len >> 6; |
57 | nbytes = nblocks << 6; |
58 | } else if (di->block_size == 1 << 7) { // sha384 & sha512 |
59 | nblocks = len >> 7; |
60 | nbytes = nblocks << 7; |
61 | } else { |
62 | nblocks = len / di->block_size; |
63 | nbytes = nblocks * di->block_size; |
64 | } |
65 | |
66 | di->compress(ccdigest_state(di, ctx), nblocks, data_ptr); |
67 | len -= nbytes; |
68 | data_ptr += nbytes; |
69 | ccdigest_nbits(di, ctx) += (uint64_t) (nbytes) * 8; |
70 | } else { |
71 | size_t n = CC_MIN(di->block_size - ccdigest_num(di, ctx), len); |
72 | cc_memcpy(ccdigest_data(di, ctx) + ccdigest_num(di, ctx), data_ptr, n); |
73 | /* typecast: less than block size, will always fit into an int */ |
74 | ccdigest_num(di, ctx) += (unsigned int)n; |
75 | len -= n; |
76 | data_ptr += n; |
77 | if (ccdigest_num(di, ctx) == di->block_size) { |
78 | di->compress(ccdigest_state(di, ctx), 1, ccdigest_data(di, ctx)); |
79 | ccdigest_nbits(di, ctx) += ccdigest_num(di, ctx) * 8; |
80 | ccdigest_num(di, ctx) = 0; |
81 | } |
82 | } |
83 | } |
84 | } |
85 | |