42 lines
938 B
C
42 lines
938 B
C
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#include "include\defines.h"
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#include "include\boot\dc_header.h"
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#ifdef SMALL
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#include "crypto_small\sha512_pkcs5_2_small.h"
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#else
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#include "crypto_fast/sha512_pkcs5_2.h"
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#endif
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int dc_decrypt_header(dc_header *header, dc_pass *password)
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{
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u8 dk[DISKKEY_SIZE];
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int i, succs = 0;
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xts_key hdr_key;
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dc_header hcopy;
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sha512_pkcs5_2(
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1000, password->pass, password->size,
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header->salt, PKCS5_SALT_SIZE, dk, PKCS_DERIVE_MAX);
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for (i = 0; i < CF_CIPHERS_NUM; i++)
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{
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xts_set_key(dk, i, &hdr_key);
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xts_decrypt(pv(header), pv(&hcopy), sizeof(dc_header), 0, &hdr_key);
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/* Magic 'DCRP' */
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if (hcopy.sign != DC_VOLUME_SIGN) {
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continue;
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}
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/* copy decrypted part to output */
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memcpy(&header->sign, &hcopy.sign, DC_ENCRYPTEDDATASIZE);
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succs = 1; break;
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}
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/* prevent leaks */
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memset(dk, 0, sizeof(dk));
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memset(&hdr_key, 0, sizeof(xts_key));
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memset(&hcopy, 0, sizeof(dc_header));
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return succs;
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}
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