diff options
Diffstat (limited to 'demos/evp/aesccm.c')
-rw-r--r-- | demos/evp/aesccm.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/demos/evp/aesccm.c b/demos/evp/aesccm.c new file mode 100644 index 0000000000..375d834845 --- /dev/null +++ b/demos/evp/aesccm.c @@ -0,0 +1,115 @@ +/* Simple AES CCM test program, uses the same NIST data used for the FIPS + * self test but uses the application level EVP APIs. + */ +#include <stdio.h> +#include <openssl/bio.h> +#include <openssl/evp.h> + +/* AES-CCM test data from NIST public test vectors */ + +static const unsigned char ccm_key[] = { + 0xce,0xb0,0x09,0xae,0xa4,0x45,0x44,0x51,0xfe,0xad,0xf0,0xe6, + 0xb3,0x6f,0x45,0x55,0x5d,0xd0,0x47,0x23,0xba,0xa4,0x48,0xe8 +}; + +static const unsigned char ccm_nonce[] = { + 0x76,0x40,0x43,0xc4,0x94,0x60,0xb7 +}; + +static const unsigned char ccm_adata[] = { + 0x6e,0x80,0xdd,0x7f,0x1b,0xad,0xf3,0xa1,0xc9,0xab,0x25,0xc7, + 0x5f,0x10,0xbd,0xe7,0x8c,0x23,0xfa,0x0e,0xb8,0xf9,0xaa,0xa5, + 0x3a,0xde,0xfb,0xf4,0xcb,0xf7,0x8f,0xe4 +}; + +static const unsigned char ccm_pt[] = { + 0xc8,0xd2,0x75,0xf9,0x19,0xe1,0x7d,0x7f,0xe6,0x9c,0x2a,0x1f, + 0x58,0x93,0x9d,0xfe,0x4d,0x40,0x37,0x91,0xb5,0xdf,0x13,0x10 +}; + +static const unsigned char ccm_ct[] = { + 0x8a,0x0f,0x3d,0x82,0x29,0xe4,0x8e,0x74,0x87,0xfd,0x95,0xa2, + 0x8a,0xd3,0x92,0xc8,0x0b,0x36,0x81,0xd4,0xfb,0xc7,0xbb,0xfd +}; + +static const unsigned char ccm_tag[] = { + 0x2d,0xd6,0xef,0x1c,0x45,0xd4,0xcc,0xb7,0x23,0xdc,0x07,0x44, + 0x14,0xdb,0x50,0x6d +}; + +void aes_ccm_encrypt(void) + { + EVP_CIPHER_CTX *ctx; + int outlen, tmplen; + unsigned char outbuf[1024]; + printf("AES CCM Encrypt:\n"); + printf("Plaintext:\n"); + BIO_dump_fp(stdout, ccm_pt, sizeof(ccm_pt)); + ctx = EVP_CIPHER_CTX_new(); + /* Set cipher type and mode */ + EVP_EncryptInit_ex(ctx, EVP_aes_192_ccm(), NULL, NULL, NULL); + /* Set nonce length if default 96 bits is not appropriate */ + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, sizeof(ccm_nonce), NULL); + /* Set tag length */ + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, sizeof(ccm_tag), NULL); + /* Initialise key and IV */ + EVP_EncryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce); + /* Set plaintext length: only needed if AAD is used */ + EVP_EncryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_pt)); + /* Zero or one call to specify any AAD */ + EVP_EncryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata)); + /* Encrypt plaintext: can only be called once */ + EVP_EncryptUpdate(ctx, outbuf, &outlen, ccm_pt, sizeof(ccm_pt)); + /* Output encrypted block */ + printf("Ciphertext:\n"); + BIO_dump_fp(stdout, outbuf, outlen); + /* Finalise: note get no output for CCM */ + EVP_EncryptFinal_ex(ctx, outbuf, &outlen); + /* Get tag */ + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_GET_TAG, 16, outbuf); + /* Output tag */ + printf("Tag:\n"); + BIO_dump_fp(stdout, outbuf, 16); + EVP_CIPHER_CTX_free(ctx); + } + +void aes_ccm_decrypt(void) + { + EVP_CIPHER_CTX *ctx; + int outlen, tmplen, rv; + unsigned char outbuf[1024]; + printf("AES CCM Derypt:\n"); + printf("Ciphertext:\n"); + BIO_dump_fp(stdout, ccm_ct, sizeof(ccm_ct)); + ctx = EVP_CIPHER_CTX_new(); + /* Select cipher */ + EVP_DecryptInit_ex(ctx, EVP_aes_192_ccm(), NULL, NULL, NULL); + /* Set nonce length, omit for 96 bits */ + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, sizeof(ccm_nonce), NULL); + /* Set expected tag value */ + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, + sizeof(ccm_tag), (void *)ccm_tag); + /* Specify key and IV */ + EVP_DecryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce); + /* Set ciphertext length: only needed if we have AAD */ + EVP_EncryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_ct)); + /* Zero or one call to specify any AAD */ + EVP_DecryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata)); + /* Decrypt plaintext, verify tag: can only be called once */ + rv = EVP_DecryptUpdate(ctx, outbuf, &outlen, ccm_ct, sizeof(ccm_ct)); + /* Output decrypted block: if tag verify failed we get nothing */ + if (rv > 0) + { + printf("Plaintext:\n"); + BIO_dump_fp(stdout, outbuf, outlen); + } + else + printf("Plaintext not available: tag verify failed.\n"); + EVP_CIPHER_CTX_free(ctx); + } + +int main(int argc, char **argv) + { + aes_ccm_encrypt(); + aes_ccm_decrypt(); + } |