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Merge pull request #4758 from paul-elliott-arm/fix_cipher_output_size

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Fix divide by zero if macro used with wrong key type
This commit is contained in:
Gilles Peskine
2021-07-30 18:56:18 +02:00
committed by GitHub
parent 677c6c4cac 64df5f88c5
commit 69813477b0
4 changed files with 60 additions and 2 deletions
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6
include/psa/crypto_sizes.h
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@ -992,9 +992,10 @@
*/
#define PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(key_type, alg, input_length) \
(alg == PSA_ALG_CBC_PKCS7 ? \
(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) != 0 ? \
PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type), \
(input_length) + 1) + \
PSA_CIPHER_IV_LENGTH((key_type), (alg)) : \
PSA_CIPHER_IV_LENGTH((key_type), (alg)) : 0) : \
(PSA_ALG_IS_CIPHER(alg) ? \
(input_length) + PSA_CIPHER_IV_LENGTH((key_type), (alg)) : \
0))
@ -1073,12 +1074,13 @@
*/
#define PSA_CIPHER_UPDATE_OUTPUT_SIZE(key_type, alg, input_length) \
(PSA_ALG_IS_CIPHER(alg) ? \
(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) != 0 ? \
(((alg) == PSA_ALG_CBC_PKCS7 || \
(alg) == PSA_ALG_CBC_NO_PADDING || \
(alg) == PSA_ALG_ECB_NO_PADDING) ? \
PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type), \
input_length) : \
(input_length)) : \
(input_length)) : 0) : \
0)
/** A sufficient output buffer size for psa_cipher_update(), for any of the