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aes: Move the AES-128-CBC encryption function to common code
Move the AES-128-CBC encryption function implemented in tegra20-common/crypto.c into lib/aes.c . This is well re-usable common code. Moreover, clean the code up a bit and fix the kerneldoc-style annotations. Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut
Tom Rini
parent
957ba85ce9
commit
6e7b9f4fa0
3 changed files with 64 additions and 70 deletions
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@ -19,74 +19,6 @@ enum security_op {
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SECURITY_ENCRYPT = 1 << 1, /* Encrypt the data */
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};
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static void debug_print_vector(char *name, u32 num_bytes, u8 *data)
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{
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u32 i;
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debug("%s [%d] @0x%08x", name, num_bytes, (u32)data);
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for (i = 0; i < num_bytes; i++) {
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if (i % 16 == 0)
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debug(" = ");
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debug("%02x", data[i]);
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if ((i+1) % 16 != 0)
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debug(" ");
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}
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debug("\n");
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}
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/**
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* Apply chain data to the destination using EOR
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*
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* Each array is of length AES_AES_KEY_LENGTH.
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*
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* \param cbc_chain_data Chain data
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* \param src Source data
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* \param dst Destination data, which is modified here
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*/
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static void apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst)
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{
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int i;
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for (i = 0; i < 16; i++)
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*dst++ = *src++ ^ *cbc_chain_data++;
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}
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/**
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* Encrypt some data with AES.
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*
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* \param key_schedule Expanded key to use
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* \param src Source data to encrypt
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* \param dst Destination buffer
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* \param num_aes_blocks Number of AES blocks to encrypt
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*/
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static void encrypt_object(u8 *key_schedule, u8 *src, u8 *dst,
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u32 num_aes_blocks)
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{
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u8 tmp_data[AES_KEY_LENGTH];
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u8 *cbc_chain_data;
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u32 i;
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cbc_chain_data = zero_key; /* Convenient array of 0's for IV */
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for (i = 0; i < num_aes_blocks; i++) {
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debug("encrypt_object: block %d of %d\n", i, num_aes_blocks);
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debug_print_vector("AES Src", AES_KEY_LENGTH, src);
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/* Apply the chain data */
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apply_cbc_chain_data(cbc_chain_data, src, tmp_data);
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debug_print_vector("AES Xor", AES_KEY_LENGTH, tmp_data);
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/* encrypt the AES block */
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aes_encrypt(tmp_data, key_schedule, dst);
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debug_print_vector("AES Dst", AES_KEY_LENGTH, dst);
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/* Update pointers for next loop. */
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cbc_chain_data = dst;
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src += AES_KEY_LENGTH;
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dst += AES_KEY_LENGTH;
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}
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}
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/**
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* Shift a vector left by one bit
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*
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@ -129,7 +61,7 @@ static void sign_object(u8 *key, u8 *key_schedule, u8 *src, u8 *dst,
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for (i = 0; i < AES_KEY_LENGTH; i++)
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tmp_data[i] = 0;
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encrypt_object(key_schedule, tmp_data, left, 1);
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aes_cbc_encrypt_blocks(key_schedule, tmp_data, left, 1);
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debug_print_vector("AES(key, nonce)", AES_KEY_LENGTH, left);
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left_shift_vector(left, k1, sizeof(left));
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@ -193,7 +125,7 @@ static int encrypt_and_sign(u8 *key, enum security_op oper, u8 *src,
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if (oper & SECURITY_ENCRYPT) {
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/* Perform this in place, resulting in src being encrypted. */
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debug("encrypt_and_sign: begin encryption\n");
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encrypt_object(key_schedule, src, src, num_aes_blocks);
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aes_cbc_encrypt_blocks(key_schedule, src, src, num_aes_blocks);
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debug("encrypt_and_sign: end encryption\n");
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}
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@ -53,4 +53,14 @@ void aes_encrypt(u8 *in, u8 *expkey, u8 *out);
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*/
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void aes_decrypt(u8 *in, u8 *expkey, u8 *out);
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/**
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* aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
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*
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* @key_exp Expanded key to use
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* @src Source data to encrypt
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* @dst Destination buffer
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* @num_aes_blocks Number of AES blocks to encrypt
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*/
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void aes_cbc_encrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks);
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#endif /* _AES_REF_H_ */
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52
lib/aes.c
52
lib/aes.c
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@ -580,3 +580,55 @@ void aes_decrypt(u8 *in, u8 *expkey, u8 *out)
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memcpy(out, state, sizeof(state));
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}
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static void debug_print_vector(char *name, u32 num_bytes, u8 *data)
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{
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#ifdef DEBUG
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printf("%s [%d] @0x%08x", name, num_bytes, (u32)data);
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print_buffer(0, data, 1, num_bytes, 16);
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#endif
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}
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/**
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* Apply chain data to the destination using EOR
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*
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* Each array is of length AES_KEY_LENGTH.
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*
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* @cbc_chain_data Chain data
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* @src Source data
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* @dst Destination data, which is modified here
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*/
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static void apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst)
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{
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int i;
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for (i = 0; i < AES_KEY_LENGTH; i++)
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*dst++ = *src++ ^ *cbc_chain_data++;
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}
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void aes_cbc_encrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks)
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{
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u8 zero_key[AES_KEY_LENGTH] = { 0 };
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u8 tmp_data[AES_KEY_LENGTH];
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/* Convenient array of 0's for IV */
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u8 *cbc_chain_data = zero_key;
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u32 i;
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for (i = 0; i < num_aes_blocks; i++) {
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debug("encrypt_object: block %d of %d\n", i, num_aes_blocks);
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debug_print_vector("AES Src", AES_KEY_LENGTH, src);
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/* Apply the chain data */
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apply_cbc_chain_data(cbc_chain_data, src, tmp_data);
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debug_print_vector("AES Xor", AES_KEY_LENGTH, tmp_data);
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/* Encrypt the AES block */
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aes_encrypt(tmp_data, key_exp, dst);
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debug_print_vector("AES Dst", AES_KEY_LENGTH, dst);
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/* Update pointers for next loop. */
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cbc_chain_data = dst;
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src += AES_KEY_LENGTH;
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dst += AES_KEY_LENGTH;
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}
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}
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