n_digest.h File Reference

Message digests, HMAC, PBKDF2, and AES-256-GCM AEAD over the OpenSSL EVP API. More...

#include "nilorea/n_str.h"
#include <stddef.h>

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Macros
#define	N_AEAD_AES256GCM_KEY_LEN   32
	key size in bytes for AES-256-GCM
#define	N_AEAD_AES256GCM_TAG_LEN   16
	authentication tag size in bytes for AES-256-GCM
#define	N_DIGEST_MD5_LEN   16
	output size in bytes of an MD5 digest
#define	N_DIGEST_SHA1_LEN   20
	output size in bytes of a SHA-1 digest
#define	N_DIGEST_SHA256_LEN   32
	output size in bytes of a SHA-256 digest
#define	N_DIGEST_SHA384_LEN   48
	output size in bytes of a SHA-384 digest
#define	N_DIGEST_SHA512_LEN   64
	output size in bytes of a SHA-512 digest

Functions
int	n_aead_aes256gcm_decrypt (const unsigned char *key, const unsigned char *iv, size_t iv_len, const unsigned char *aad, size_t aad_len, const unsigned char *ct, size_t ct_len, const unsigned char *tag, unsigned char *out_pt)
	AES-256-GCM authenticated decryption.
int	n_aead_aes256gcm_encrypt (const unsigned char *key, const unsigned char *iv, size_t iv_len, const unsigned char *aad, size_t aad_len, const unsigned char *pt, size_t pt_len, unsigned char *out_ct, unsigned char *out_tag)
	AES-256-GCM authenticated encryption.
int	n_digest_consttime_equal (const unsigned char *a, const unsigned char *b, size_t len)
	constant-time comparison of two equal-length byte buffers (for verifying MACs/signatures without a timing side channel).
int	n_digest_md5 (const unsigned char *data, size_t len, unsigned char *out)
	compute the MD5 digest of len bytes of data into out (N_DIGEST_MD5_LEN bytes).
int	n_digest_sha1 (const unsigned char *data, size_t len, unsigned char *out)
	compute the SHA-1 digest of len bytes of data into out (N_DIGEST_SHA1_LEN bytes).
int	n_digest_sha256 (const unsigned char *data, size_t len, unsigned char *out)
	compute the SHA-256 digest of len bytes of data into out (N_DIGEST_SHA256_LEN bytes).
N_STR *	n_digest_sha256_hex (const unsigned char *data, size_t len)
	compute the SHA-256 digest of data and return it as a lowercase hex N_STR; free with free_nstr.
int	n_digest_sha384 (const unsigned char *data, size_t len, unsigned char *out)
	compute the SHA-384 digest of len bytes of data into out (N_DIGEST_SHA384_LEN bytes).
int	n_digest_sha512 (const unsigned char *data, size_t len, unsigned char *out)
	compute the SHA-512 digest of len bytes of data into out (N_DIGEST_SHA512_LEN bytes).
int	n_hmac_sha1 (const unsigned char *key, size_t key_len, const unsigned char *data, size_t data_len, unsigned char *out)
	compute HMAC-SHA1 of data under key into out (N_DIGEST_SHA1_LEN bytes).
int	n_hmac_sha256 (const unsigned char *key, size_t key_len, const unsigned char *data, size_t data_len, unsigned char *out)
	compute HMAC-SHA256 of data under key into out (N_DIGEST_SHA256_LEN bytes).
int	n_hmac_sha384 (const unsigned char *key, size_t key_len, const unsigned char *data, size_t data_len, unsigned char *out)
	compute HMAC-SHA384 of data under key into out (N_DIGEST_SHA384_LEN bytes).
int	n_hmac_sha512 (const unsigned char *key, size_t key_len, const unsigned char *data, size_t data_len, unsigned char *out)
	compute HMAC-SHA512 of data under key into out (N_DIGEST_SHA512_LEN bytes).
int	n_pbkdf2_hmac_sha1 (const unsigned char *pass, size_t pass_len, const unsigned char *salt, size_t salt_len, unsigned int iterations, unsigned char *out, size_t out_len)
	derive out_len key bytes from pass and salt with PBKDF2-HMAC-SHA1 over iterations rounds (RFC 2898).
int	n_pbkdf2_hmac_sha256 (const unsigned char *pass, size_t pass_len, const unsigned char *salt, size_t salt_len, unsigned int iterations, unsigned char *out, size_t out_len)
	derive out_len key bytes from pass and salt with PBKDF2-HMAC-SHA256 over iterations rounds (RFC 2898).

Detailed Description

Message digests, HMAC, PBKDF2, and AES-256-GCM AEAD over the OpenSSL EVP API.

Author

Castagnier Mickael

Version

1.0

Definition in file n_digest.h.