this will allow to generate a KEY + IV based on a password and salt for AES encryption/decryption as example or simply the key for hmac or rsa from text password Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
95 lines
1.7 KiB
C
95 lines
1.7 KiB
C
/*
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* (C) Copyright 2015 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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*
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* Under GPLv2 Only
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*/
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#include <common.h>
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#include <malloc.h>
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#include <errno.h>
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#include <crypto/pbkdf2.h>
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int pkcs5_pbkdf2_hmac(struct digest* d,
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const unsigned char *pwd, size_t pwd_len,
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const unsigned char *salt, size_t salt_len,
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uint32_t iteration,
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uint32_t key_len, unsigned char *key)
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{
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int i, j, k;
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unsigned char cnt[4];
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uint32_t pass_len;
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unsigned char *tmpdgt;
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uint32_t d_len;
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int ret;
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if (!d)
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return -EINVAL;
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d_len = digest_length(d);
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tmpdgt = malloc(d_len);
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if (!tmpdgt)
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return -ENOMEM;
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i = 1;
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ret = digest_set_key(d, pwd, pwd_len);
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if (ret)
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goto err;
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while (key_len) {
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pass_len = min(key_len, d_len);
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cnt[0] = (i >> 24) & 0xff;
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cnt[1] = (i >> 16) & 0xff;
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cnt[2] = (i >> 8) & 0xff;
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cnt[3] = i & 0xff;
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ret = digest_init(d);
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if (ret)
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goto err;
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ret = digest_update(d, salt, salt_len);
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if (ret)
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goto err;
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ret = digest_update(d, cnt, 4);
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if (ret)
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goto err;
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ret = digest_final(d, tmpdgt);
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if (ret)
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goto err;
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memcpy(key, tmpdgt, pass_len);
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for (j = 1; j < iteration; j++) {
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ret = digest_digest(d, tmpdgt, d_len, tmpdgt);
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if (ret)
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goto err;
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for(k = 0; k < pass_len; k++)
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key[k] ^= tmpdgt[k];
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}
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key_len -= pass_len;
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key += pass_len;
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i++;
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}
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ret = 0;
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err:
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free(tmpdgt);
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return ret;;
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}
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int pkcs5_pbkdf2_hmac_sha1(const unsigned char *pwd, size_t pwd_len,
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const unsigned char *salt, size_t salt_len,
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uint32_t iter,
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uint32_t key_len, unsigned char *key)
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{
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int ret;
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struct digest* d = digest_alloc("hmac(sha1)");
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ret = pkcs5_pbkdf2_hmac(d, pwd, pwd_len, salt, salt_len, iter,
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key_len, key);
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digest_free(d);
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return ret;
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}
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