n_digest.c File Reference

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

#include "nilorea/n_digest.h"
#include "nilorea/n_common.h"
#include "nilorea/n_hex.h"
#include "nilorea/n_log.h"
#include "nilorea/n_str.h"
#include <openssl/crypto.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <limits.h>
#include <string.h>

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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_aead_chacha20poly1305_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)
	ChaCha20-Poly1305 authenticated decryption.
int	n_aead_chacha20poly1305_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)
	ChaCha20-Poly1305 (RFC 8439) authenticated encryption.
int	n_digest_blake2b512 (const unsigned char *data, size_t len, unsigned char *out)
	compute the BLAKE2b-512 digest of len bytes of data into out (N_DIGEST_BLAKE2B512_LEN bytes).
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).
static int	n_digest_oneshot (const EVP_MD *md, const unsigned char *data, size_t len, unsigned char *out, const char *name)
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).
static int	n_hmac_oneshot (const EVP_MD *md, unsigned int expect_len, const unsigned char *key, size_t key_len, const unsigned char *data, size_t data_len, unsigned char *out, const char *name)
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_kdf_hkdf_sha256 (const unsigned char *ikm, size_t ikm_len, const unsigned char *salt, size_t salt_len, const unsigned char *info, size_t info_len, unsigned char *out, size_t out_len)
	HKDF-SHA256 (RFC 5869 extract-then-expand) of ikm with the given salt and info into out (out_len bytes).
int	n_kdf_scrypt (const unsigned char *pass, size_t pass_len, const unsigned char *salt, size_t salt_len, uint64_t n, uint32_t r, uint32_t p, uint64_t maxmem, unsigned char *out, size_t out_len)
	scrypt (RFC 7914) of pass with salt and cost parameters n (CPU/memory, a power of two), r (block size) and p (parallelization) into out (out_len bytes); maxmem bounds the working-memory in 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).
static int	n_pbkdf2_oneshot (const EVP_MD *md, 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, const char *name)

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.c.

Function Documentation

n_digest_oneshot()

int n_digest_oneshot ( const EVP_MD * md, const unsigned char * data, size_t len, unsigned char * out, const char * name )

static

Definition at line 45 of file n_digest.c.

References LOG_ERR, and n_log.

Referenced by n_digest_md5(), n_digest_sha1(), n_digest_sha256(), n_digest_sha384(), and n_digest_sha512().

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n_hmac_oneshot()

int n_hmac_oneshot ( const EVP_MD * md, unsigned int expect_len, const unsigned char * key, size_t key_len, const unsigned char * data, size_t data_len, unsigned char * out, const char * name )

static

Definition at line 105 of file n_digest.c.

References key, LOG_ERR, and n_log.

Referenced by n_hmac_sha1(), n_hmac_sha256(), n_hmac_sha384(), and n_hmac_sha512().

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n_pbkdf2_oneshot()

int n_pbkdf2_oneshot ( const EVP_MD * md, 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, const char * name )

static

Definition at line 148 of file n_digest.c.

References LOG_ERR, and n_log.

Referenced by n_pbkdf2_hmac_sha1(), and n_pbkdf2_hmac_sha256().

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