3a0c68edfd
The algorithm used is essentially PBKDF1 from RFC 2898 but using hmac_sha1 rather than SHA1 directly (suggested by smb@research.att.com). * The format of the encrypted password is: * $<tag>$<iterations>$<salt>$<digest> * * where: * <tag> is "sha1" * <iterations> is an unsigned int identifying how many rounds * have been applied to <digest>. The number * should vary slightly for each password to make * it harder to generate a dictionary of * pre-computed hashes. See crypt_sha1_iterations. * <salt> up to 64 bytes of random data, 8 bytes is * currently considered more than enough. * <digest> the hashed password. hmac.c implementes HMAC as defined in RFC 2104 and includes a unit test for both hmac_sha1 and hmac_sha1 using a selection of the Known Answer Tests from RFC 2202. It is worth noting that to be FIPS compliant the hmac key (password) should be 10-20 chars.
18 lines
306 B
C
18 lines
306 B
C
/*
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* hmac_sha1 - using HMAC from RFC 2104
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*/
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#include "sha1.h"
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#define HMAC_HASH SHA1
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#define HMAC_FUNC hmac_sha1
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#define HMAC_KAT hmac_kat_sha1
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#define HASH_LENGTH 20
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#define HASH_CTX SHA1_CTX
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#define HASH_Init SHA1Init
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#define HASH_Update SHA1Update
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#define HASH_Final SHA1Final
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#include "hmac.c"
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