Functions
int	wc_SRTP_KDF (const byte key, word32 keySz, const byte salt, word32 saltSz, int kdrIdx, const byte index, byte key1, word32 key1Sz, byte key2, word32 key2Sz, byte key3, word32 key3Sz)
	This function derives keys using SRTP KDF algorithm. More...

int	wc_SRTCP_KDF (const byte key, word32 keySz, const byte salt, word32 saltSz, int kdrIdx, const byte index, byte key1, word32 key1Sz, byte key2, word32 key2Sz, byte key3, word32 key3Sz)
	This function derives keys using SRTCP KDF algorithm. More...

int	wc_SRTP_KDF_label (const byte key, word32 keySz, const byte salt, word32 saltSz, int kdrIdx, const byte index, byte label, byte outKey, word32 outKeySz)
	This function derives a key with label using SRTP KDF algorithm. More...

int	wc_SRTP_KDF_kdr_to_idx (word32 kdr)
	This function converts a kdr value to an index to use in SRTP/SRTCP KDF API. More...

Detailed Description

Function Documentation

◆ wc_SRTCP_KDF()

int wc_SRTCP_KDF	(	const byte *	key,
		word32	keySz,
		const byte *	salt,
		word32	saltSz,
		int	kdrIdx,
		const byte *	index,
		byte *	key1,
		word32	key1Sz,
		byte *	key2,
		word32	key2Sz,
		byte *	key3,
		word32	key3Sz
	)

This function derives keys using SRTCP KDF algorithm.

Returns: 0 Returned upon successful key derivation.; BAD_FUNC_ARG Returned when key or salt is NULL; BAD_FUNC_ARG Returned when key length is not 16, 24 or 32.; BAD_FUNC_ARG Returned when saltSz is larger than 14.; BAD_FUNC_ARG Returned when kdrIdx is less than -1 or larger than 24.; MEMORY_E on dynamic memory allocation failure.

Parameters

[in]	key	Key to use with encryption.
[in]	keySz	Size of key in bytes.
[in]	salt	Random non-secret value.
[in]	saltSz	Size of random in bytes.
[in]	kdrIdx	Key derivation rate. kdr = 0 when -1, otherwise kdr = 2^kdrIdx.
[in]	index	Index value to XOR in.
[out]	key1	First key. Label value of 0x00.
[in]	key1Sz	Size of first key in bytes.
[out]	key2	Second key. Label value of 0x01.
[in]	key2Sz	Size of second key in bytes.
[out]	key3	Third key. Label value of 0x02.
[in]	key3Sz	Size of third key in bytes.

Example

unsigned char key[16] = { ... };
unsigned char salt[14] = { ... };
unsigned char index[4] = { ... };
unsigned char keyE[16];
unsigned char keyA[20];
unsigned char keyS[14];
int kdrIdx = 0; // Use all of index
int ret;
 
ret = wc_SRTCP_KDF(key, sizeof(key), salt, sizeof(salt), kdrIdx, index,
    keyE, sizeof(keyE), keyA, sizeof(keyA), keyS, sizeof(keyS));
if (ret != 0) {
    WOLFSSL_MSG("wc_SRTP_KDF failed");
}

See also: wc_SRTP_KDF; wc_SRTP_KDF_label; wc_SRTCP_KDF_label; wc_SRTP_KDF_kdr_to_idx

◆ wc_SRTP_KDF()

int wc_SRTP_KDF	(	const byte *	key,
		word32	keySz,
		const byte *	salt,
		word32	saltSz,
		int	kdrIdx,
		const byte *	index,
		byte *	key1,
		word32	key1Sz,
		byte *	key2,
		word32	key2Sz,
		byte *	key3,
		word32	key3Sz
	)

This function derives keys using SRTP KDF algorithm.

Returns: 0 Returned upon successful key derivation.; BAD_FUNC_ARG Returned when key or salt is NULL; BAD_FUNC_ARG Returned when key length is not 16, 24 or 32.; BAD_FUNC_ARG Returned when saltSz is larger than 14.; BAD_FUNC_ARG Returned when kdrIdx is less than -1 or larger than 24.; MEMORY_E on dynamic memory allocation failure.

Parameters

[in]	key	Key to use with encryption.
[in]	keySz	Size of key in bytes.
[in]	salt	Random non-secret value.
[in]	saltSz	Size of random in bytes.
[in]	kdrIdx	Key derivation rate. kdr = 0 when -1, otherwise kdr = 2^kdrIdx.
[in]	index	Index value to XOR in.
[out]	key1	First key. Label value of 0x00.
[in]	key1Sz	Size of first key in bytes.
[out]	key2	Second key. Label value of 0x01.
[in]	key2Sz	Size of second key in bytes.
[out]	key3	Third key. Label value of 0x02.
[in]	key3Sz	Size of third key in bytes.

Example

unsigned char key[16] = { ... };
unsigned char salt[14] = { ... };
unsigned char index[6] = { ... };
unsigned char keyE[16];
unsigned char keyA[20];
unsigned char keyS[14];
int kdrIdx = 0; // Use all of index
int ret;
 
ret = wc_SRTP_KDF(key, sizeof(key), salt, sizeof(salt), kdrIdx, index,
    keyE, sizeof(keyE), keyA, sizeof(keyA), keyS, sizeof(keyS));
if (ret != 0) {
    WOLFSSL_MSG("wc_SRTP_KDF failed");
}

See also: wc_SRTCP_KDF; wc_SRTP_KDF_label; wc_SRTCP_KDF_label; wc_SRTP_KDF_kdr_to_idx

◆ wc_SRTP_KDF_kdr_to_idx()

int wc_SRTP_KDF_kdr_to_idx ( word32 kdr )

This function converts a kdr value to an index to use in SRTP/SRTCP KDF API.

Returns: Key derivation rate as an index.

Parameters

[in] kdr Key derivation rate to convert.

Example

word32 kdr = 0x00000010;
int kdrIdx;
int ret;
 
kdrIdx = wc_SRTP_KDF_kdr_to_idx(kdr);

See also: wc_SRTP_KDF; wc_SRTCP_KDF; wc_SRTP_KDF_label; wc_SRTCP_KDF_label

◆ wc_SRTP_KDF_label()

int wc_SRTP_KDF_label	(	const byte *	key,
		word32	keySz,
		const byte *	salt,
		word32	saltSz,
		int	kdrIdx,
		const byte *	index,
		byte	label,
		byte *	outKey,
		word32	outKeySz
	)

This function derives a key with label using SRTP KDF algorithm.

This function derives key with label using SRTCP KDF algorithm.

Returns: 0 Returned upon successful key derivation.; BAD_FUNC_ARG Returned when key, salt or outKey is NULL; BAD_FUNC_ARG Returned when key length is not 16, 24 or 32.; BAD_FUNC_ARG Returned when saltSz is larger than 14.; BAD_FUNC_ARG Returned when kdrIdx is less than -1 or larger than 24.; MEMORY_E on dynamic memory allocation failure.

Parameters

[in]	key	Key to use with encryption.
[in]	keySz	Size of key in bytes.
[in]	salt	Random non-secret value.
[in]	saltSz	Size of random in bytes.
[in]	kdrIdx	Key derivation rate. kdr = 0 when -1, otherwise kdr = 2^kdrIdx.
[in]	index	Index value to XOR in.
[in]	label	Label to use when deriving key.
[out]	outKey	Derived key.
[in]	outKeySz	Size of derived key in bytes.

Example

unsigned char key[16] = { ... };
unsigned char salt[14] = { ... };
unsigned char index[6] = { ... };
unsigned char keyE[16];
int kdrIdx = 0; // Use all of index
int ret;
 
ret = wc_SRTP_KDF_label(key, sizeof(key), salt, sizeof(salt), kdrIdx, index,
    WC_SRTP_LABEL_ENCRYPTION, keyE, sizeof(keyE));
if (ret != 0) {
    WOLFSSL_MSG("wc_SRTP_KDF failed");
}

See also: wc_SRTP_KDF; wc_SRTCP_KDF; wc_SRTCP_KDF_label; wc_SRTP_KDF_kdr_to_idx

Returns: 0 Returned upon successful key derivation.; BAD_FUNC_ARG Returned when key, salt or outKey is NULL; BAD_FUNC_ARG Returned when key length is not 16, 24 or 32.; BAD_FUNC_ARG Returned when saltSz is larger than 14.; BAD_FUNC_ARG Returned when kdrIdx is less than -1 or larger than 24.; MEMORY_E on dynamic memory allocation failure.

Parameters

[in]	key	Key to use with encryption.
[in]	keySz	Size of key in bytes.
[in]	salt	Random non-secret value.
[in]	saltSz	Size of random in bytes.
[in]	kdrIdx	Key derivation rate. kdr = 0 when -1, otherwise kdr = 2^kdrIdx.
[in]	index	Index value to XOR in.
[in]	label	Label to use when deriving key.
[out]	outKey	Derived key.
[in]	outKeySz	Size of derived key in bytes.

Example

unsigned char key[16] = { ... };
unsigned char salt[14] = { ... };
unsigned char index[4] = { ... };
unsigned char keyE[16];
int kdrIdx = 0; // Use all of index
int ret;
 
ret = wc_SRTCP_KDF_label(key, sizeof(key), salt, sizeof(salt), kdrIdx,
    index, WC_SRTCP_LABEL_ENCRYPTION, keyE, sizeof(keyE));
if (ret != 0) {
    WOLFSSL_MSG("wc_SRTP_KDF failed");
}

See also: wc_SRTP_KDF; wc_SRTCP_KDF; wc_SRTP_KDF_label; wc_SRTP_KDF_kdr_to_idx

Functions

Detailed Description

Function Documentation

◆ wc_SRTCP_KDF()

◆ wc_SRTP_KDF()

◆ wc_SRTP_KDF_kdr_to_idx()

◆ wc_SRTP_KDF_label()