[CRYPTO] ctr: Add CTR (Counter) block cipher mode

This patch implements CTR mode for IPsec.
It is based off of RFC 3686.

Please note:
1. CTR turns a block cipher into a stream cipher.
Encryption is done in blocks, however the last block
may be a partial block.

A "counter block" is encrypted, creating a keystream
that is xor'ed with the plaintext. The counter portion
of the counter block is incremented after each block
of plaintext is encrypted.
Decryption is performed in same manner.

2. The CTR counterblock is composed of,
        nonce + IV + counter

The size of the counterblock is equivalent to the
blocksize of the cipher.
        sizeof(nonce) + sizeof(IV) + sizeof(counter) = blocksize

The CTR template requires the name of the cipher
algorithm, the sizeof the nonce, and the sizeof the iv.
        ctr(cipher,sizeof_nonce,sizeof_iv)

So for example,
        ctr(aes,4,8)
specifies the counterblock will be composed of 4 bytes
from a nonce, 8 bytes from the iv, and 4 bytes for counter
since aes has a blocksize of 16 bytes.

3. The counter portion of the counter block is stored
in big endian for conformance to rfc 3686.

Signed-off-by: Joy Latten <latten@austin.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 185 insertions, 0 deletions

diff --git a/crypto/tcrypt.h b/crypto/tcrypt.h
index ec86138..f7f9b23 100644
--- a/crypto/tcrypt.h
+++ b/crypto/tcrypt.h
@@ -2146,6 +2146,8 @@ static struct cipher_testvec cast6_dec_tv_template[] = {
 #define AES_LRW_DEC_TEST_VECTORS 8
 #define AES_XTS_ENC_TEST_VECTORS 4
 #define AES_XTS_DEC_TEST_VECTORS 4
+#define AES_CTR_ENC_TEST_VECTORS 6
+#define AES_CTR_DEC_TEST_VECTORS 6
 
 static struct cipher_testvec aes_enc_tv_template[] = {
 	{ /* From FIPS-197 */
@@ -3180,6 +3182,189 @@ static struct cipher_testvec aes_xts_dec_tv_template[] = {
 	}
 };
 
+
+static struct cipher_testvec aes_ctr_enc_tv_template[] = {
+	{ /* From RFC 3686 */
+		.key	= { 0xae, 0x68, 0x52, 0xf8, 0x12, 0x10, 0x67, 0xcc,
+			    0x4b, 0xf7, 0xa5, 0x76, 0x55, 0x77, 0xf3, 0x9e,
+			    0x00, 0x00, 0x00, 0x30 },
+		.klen	= 20,
+		.iv 	= { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+		.input 	= { "Single block msg" },
+		.ilen	= 16,
+		.result = { 0xe4, 0x09, 0x5d, 0x4f, 0xb7, 0xa7, 0xb3, 0x79,
+			    0x2d, 0x61, 0x75, 0xa3, 0x26, 0x13, 0x11, 0xb8 },
+		.rlen	= 16,
+	}, {
+		.key	= { 0x7e, 0x24, 0x06, 0x78, 0x17, 0xfa, 0xe0, 0xd7,
+			    0x43, 0xd6, 0xce, 0x1f, 0x32, 0x53, 0x91, 0x63,
+			    0x00, 0x6c, 0xb6, 0xdb },
+		.klen	= 20,
+		.iv 	= { 0xc0, 0x54, 0x3b, 0x59, 0xda, 0x48, 0xd9, 0x0b },
+		.input	= { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+			    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+			    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+			    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
+		.ilen 	= 32,
+		.result = { 0x51, 0x04, 0xa1, 0x06, 0x16, 0x8a, 0x72, 0xd9,
+			    0x79, 0x0d, 0x41, 0xee, 0x8e, 0xda, 0xd3, 0x88,
+			    0xeb, 0x2e, 0x1e, 0xfc, 0x46, 0xda, 0x57, 0xc8,
+			    0xfc, 0xe6, 0x30, 0xdf, 0x91, 0x41, 0xbe, 0x28 },
+		.rlen	= 32,
+	}, {
+		.key 	= { 0x16, 0xaf, 0x5b, 0x14, 0x5f, 0xc9, 0xf5, 0x79,
+			    0xc1, 0x75, 0xf9, 0x3e, 0x3b, 0xfb, 0x0e, 0xed,
+			    0x86, 0x3d, 0x06, 0xcc, 0xfd, 0xb7, 0x85, 0x15,
+			    0x00, 0x00, 0x00, 0x48 },
+		.klen 	= 28,
+		.iv	= { 0x36, 0x73, 0x3c, 0x14, 0x7d, 0x6d, 0x93, 0xcb },
+		.input	= { "Single block msg" },
+		.ilen 	= 16,
+		.result	= { 0x4b, 0x55, 0x38, 0x4f, 0xe2, 0x59, 0xc9, 0xc8,
+			    0x4e, 0x79, 0x35, 0xa0, 0x03, 0xcb, 0xe9, 0x28 },
+		.rlen	= 16,
+	}, {
+		.key	= { 0x7c, 0x5c, 0xb2, 0x40, 0x1b, 0x3d, 0xc3, 0x3c,
+			    0x19, 0xe7, 0x34, 0x08, 0x19, 0xe0, 0xf6, 0x9c,
+			    0x67, 0x8c, 0x3d, 0xb8, 0xe6, 0xf6, 0xa9, 0x1a,
+			    0x00, 0x96, 0xb0, 0x3b },
+		.klen	= 28,
+		.iv 	= { 0x02, 0x0c, 0x6e, 0xad, 0xc2, 0xcb, 0x50, 0x0d },
+		.input	= { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+			    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+			    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+			    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
+		.ilen	= 32,
+		.result	= { 0x45, 0x32, 0x43, 0xfc, 0x60, 0x9b, 0x23, 0x32,
+			    0x7e, 0xdf, 0xaa, 0xfa, 0x71, 0x31, 0xcd, 0x9f,
+			    0x84, 0x90, 0x70, 0x1c, 0x5a, 0xd4, 0xa7, 0x9c,
+			    0xfc, 0x1f, 0xe0, 0xff, 0x42, 0xf4, 0xfb, 0x00 },
+		.rlen 	= 32,
+	}, {
+		.key 	= { 0x77, 0x6b, 0xef, 0xf2, 0x85, 0x1d, 0xb0, 0x6f,
+			    0x4c, 0x8a, 0x05, 0x42, 0xc8, 0x69, 0x6f, 0x6c,
+			    0x6a, 0x81, 0xaf, 0x1e, 0xec, 0x96, 0xb4, 0xd3,
+			    0x7f, 0xc1, 0xd6, 0x89, 0xe6, 0xc1, 0xc1, 0x04,
+			    0x00, 0x00, 0x00, 0x60 },
+		.klen	= 36,
+		.iv 	= { 0xdb, 0x56, 0x72, 0xc9, 0x7a, 0xa8, 0xf0, 0xb2 },
+		.input	= { "Single block msg" },
+		.ilen	= 16,
+		.result = { 0x14, 0x5a, 0xd0, 0x1d, 0xbf, 0x82, 0x4e, 0xc7,
+			    0x56, 0x08, 0x63, 0xdc, 0x71, 0xe3, 0xe0, 0xc0 },
+		.rlen 	= 16,
+	}, {
+		.key	= { 0xf6, 0xd6, 0x6d, 0x6b, 0xd5, 0x2d, 0x59, 0xbb,
+			    0x07, 0x96, 0x36, 0x58, 0x79, 0xef, 0xf8, 0x86,
+			    0xc6, 0x6d, 0xd5, 0x1a, 0x5b, 0x6a, 0x99, 0x74,
+			    0x4b, 0x50, 0x59, 0x0c, 0x87, 0xa2, 0x38, 0x84,
+			    0x00, 0xfa, 0xac, 0x24 },
+		.klen 	= 36,
+		.iv	= { 0xc1, 0x58, 0x5e, 0xf1, 0x5a, 0x43, 0xd8, 0x75 },
+		.input	= { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+			    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+			    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+			    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
+		.ilen	= 32,
+		.result = { 0xf0, 0x5e, 0x23, 0x1b, 0x38, 0x94, 0x61, 0x2c,
+			    0x49, 0xee, 0x00, 0x0b, 0x80, 0x4e, 0xb2, 0xa9,
+			    0xb8, 0x30, 0x6b, 0x50, 0x8f, 0x83, 0x9d, 0x6a,
+			    0x55, 0x30, 0x83, 0x1d, 0x93, 0x44, 0xaf, 0x1c },
+		.rlen	= 32,
+	},
+};
+
+static struct cipher_testvec aes_ctr_dec_tv_template[] = {
+	{ /* From RFC 3686 */
+		.key	= { 0xae, 0x68, 0x52, 0xf8, 0x12, 0x10, 0x67, 0xcc,
+			    0x4b, 0xf7, 0xa5, 0x76, 0x55, 0x77, 0xf3, 0x9e,
+			    0x00, 0x00, 0x00, 0x30 },
+		.klen	= 20,
+		.iv 	= { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+		.input	= { 0xe4, 0x09, 0x5d, 0x4f, 0xb7, 0xa7, 0xb3, 0x79,
+			    0x2d, 0x61, 0x75, 0xa3, 0x26, 0x13, 0x11, 0xb8 },
+		.ilen	= 16,
+		.result	= { "Single block msg" },
+		.rlen	= 16,
+	}, {
+		.key	= { 0x7e, 0x24, 0x06, 0x78, 0x17, 0xfa, 0xe0, 0xd7,
+			    0x43, 0xd6, 0xce, 0x1f, 0x32, 0x53, 0x91, 0x63,
+			    0x00, 0x6c, 0xb6, 0xdb },
+		.klen	= 20,
+		.iv 	= { 0xc0, 0x54, 0x3b, 0x59, 0xda, 0x48, 0xd9, 0x0b },
+		.input	= { 0x51, 0x04, 0xa1, 0x06, 0x16, 0x8a, 0x72, 0xd9,
+			    0x79, 0x0d, 0x41, 0xee, 0x8e, 0xda, 0xd3, 0x88,
+			    0xeb, 0x2e, 0x1e, 0xfc, 0x46, 0xda, 0x57, 0xc8,
+			    0xfc, 0xe6, 0x30, 0xdf, 0x91, 0x41, 0xbe, 0x28 },
+		.ilen 	= 32,
+		.result	= { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+			    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+			    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+			    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
+		.rlen	= 32,
+	}, {
+		.key 	= { 0x16, 0xaf, 0x5b, 0x14, 0x5f, 0xc9, 0xf5, 0x79,
+			    0xc1, 0x75, 0xf9, 0x3e, 0x3b, 0xfb, 0x0e, 0xed,
+			    0x86, 0x3d, 0x06, 0xcc, 0xfd, 0xb7, 0x85, 0x15,
+			    0x00, 0x00, 0x00, 0x48 },
+		.klen 	= 28,
+		.iv	= { 0x36, 0x73, 0x3c, 0x14, 0x7d, 0x6d, 0x93, 0xcb },
+		.input	= { 0x4b, 0x55, 0x38, 0x4f, 0xe2, 0x59, 0xc9, 0xc8,
+			    0x4e, 0x79, 0x35, 0xa0, 0x03, 0xcb, 0xe9, 0x28 },
+		.ilen 	= 16,
+		.result	= { "Single block msg" },
+		.rlen	= 16,
+	}, {
+		.key	= { 0x7c, 0x5c, 0xb2, 0x40, 0x1b, 0x3d, 0xc3, 0x3c,
+			    0x19, 0xe7, 0x34, 0x08, 0x19, 0xe0, 0xf6, 0x9c,
+			    0x67, 0x8c, 0x3d, 0xb8, 0xe6, 0xf6, 0xa9, 0x1a,
+			    0x00, 0x96, 0xb0, 0x3b },
+		.klen	= 28,
+		.iv 	= { 0x02, 0x0c, 0x6e, 0xad, 0xc2, 0xcb, 0x50, 0x0d },
+		.input	= { 0x45, 0x32, 0x43, 0xfc, 0x60, 0x9b, 0x23, 0x32,
+			    0x7e, 0xdf, 0xaa, 0xfa, 0x71, 0x31, 0xcd, 0x9f,
+			    0x84, 0x90, 0x70, 0x1c, 0x5a, 0xd4, 0xa7, 0x9c,
+			    0xfc, 0x1f, 0xe0, 0xff, 0x42, 0xf4, 0xfb, 0x00 },
+		.ilen	= 32,
+		.result	= { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+			    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+			    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+			    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
+		.rlen 	= 32,
+	}, { 
+		.key 	= { 0x77, 0x6b, 0xef, 0xf2, 0x85, 0x1d, 0xb0, 0x6f,
+			    0x4c, 0x8a, 0x05, 0x42, 0xc8, 0x69, 0x6f, 0x6c,
+			    0x6a, 0x81, 0xaf, 0x1e, 0xec, 0x96, 0xb4, 0xd3,
+			    0x7f, 0xc1, 0xd6, 0x89, 0xe6, 0xc1, 0xc1, 0x04,
+			    0x00, 0x00, 0x00, 0x60 },
+		.klen	= 36,
+		.iv 	= { 0xdb, 0x56, 0x72, 0xc9, 0x7a, 0xa8, 0xf0, 0xb2 },
+		.input	= { 0x14, 0x5a, 0xd0, 0x1d, 0xbf, 0x82, 0x4e, 0xc7,
+			    0x56, 0x08, 0x63, 0xdc, 0x71, 0xe3, 0xe0, 0xc0 },
+		.ilen	= 16,
+		.result	= { "Single block msg" },
+		.rlen 	= 16,
+	}, {
+		.key	= { 0xf6, 0xd6, 0x6d, 0x6b, 0xd5, 0x2d, 0x59, 0xbb,
+			    0x07, 0x96, 0x36, 0x58, 0x79, 0xef, 0xf8, 0x86,
+			    0xc6, 0x6d, 0xd5, 0x1a, 0x5b, 0x6a, 0x99, 0x74,
+			    0x4b, 0x50, 0x59, 0x0c, 0x87, 0xa2, 0x38, 0x84,
+			    0x00, 0xfa, 0xac, 0x24 },
+		.klen 	= 36,
+		.iv	= { 0xc1, 0x58, 0x5e, 0xf1, 0x5a, 0x43, 0xd8, 0x75 },
+		.input	= { 0xf0, 0x5e, 0x23, 0x1b, 0x38, 0x94, 0x61, 0x2c,
+			    0x49, 0xee, 0x00, 0x0b, 0x80, 0x4e, 0xb2, 0xa9,
+			    0xb8, 0x30, 0x6b, 0x50, 0x8f, 0x83, 0x9d, 0x6a,
+			    0x55, 0x30, 0x83, 0x1d, 0x93, 0x44, 0xaf, 0x1c },
+		.ilen	= 32,
+		.result	= { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+			    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+			    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+			    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
+		.rlen	= 32,
+	},
+};
+
 /* Cast5 test vectors from RFC 2144 */
 #define CAST5_ENC_TEST_VECTORS	3
 #define CAST5_DEC_TEST_VECTORS	3