IV is short for 'initialization vector'

src/encauth/chachapoly/chacha20poly1305_memory.c

@@ -15,8 +15,8 @@
   Process an entire GCM packet in one call.
   @param key               The secret key
   @param keylen            The length of the secret key
-  @param iv                The initial vector
-  @param ivlen             The length of the initial vector
+  @param iv                The initialization vector
+  @param ivlen             The length of the initialization vector
   @param aad               The additional authentication data (header)
   @param aadlen            The length of the aad
   @param in                The plaintext

src/encauth/gcm/gcm_memory.c

@@ -20,8 +20,8 @@
   @param cipher            Index of cipher to use
   @param key               The secret key
   @param keylen            The length of the secret key
-  @param IV                The initial vector
-  @param IVlen             The length of the initial vector
+  @param IV                The initialization vector
+  @param IVlen             The length of the initialization vector
   @param adata             The additional authentication data (header)
   @param adatalen          The length of the adata
   @param pt                The plaintext

src/headers/tomcrypt_cipher.h

@@ -499,8 +499,8 @@ extern struct ltc_cipher_descriptor {
    /** Accelerated GCM packet (one shot)
        @param key        The secret key
        @param keylen     The length of the secret key
-       @param IV         The initial vector
-       @param IVlen      The length of the initial vector
+       @param IV         The initialization vector
+       @param IVlen      The length of the initialization vector
        @param adata      The additional authentication data (header)
        @param adatalen   The length of the adata
        @param pt         The plaintext

src/mac/hmac/hmac_init.c

@@ -75,7 +75,7 @@ int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned lon
        zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen));
     }
 
-    /* Create the initial vector for step (3) */
+    /* Create the initialization vector for step (3) */
     for(i=0; i < LTC_HMAC_BLOCKSIZE;   i++) {
        buf[i] = hmac->key[i] ^ 0x36;
     }

src/modes/cbc/cbc_getiv.c

@@ -16,9 +16,9 @@
 #ifdef LTC_CBC_MODE
 
 /**
-   Get the current initial vector
-   @param IV   [out] The destination of the initial vector
-   @param len  [in/out]  The max size and resulting size of the initial vector
+   Get the current initialization vector
+   @param IV   [out] The destination of the initialization vector
+   @param len  [in/out]  The max size and resulting size of the initialization vector
    @param cbc  The CBC state
    @return CRYPT_OK if successful
 */

src/modes/cbc/cbc_setiv.c

@@ -17,8 +17,8 @@
 #ifdef LTC_CBC_MODE
 
 /**
-   Set an initial vector
-   @param IV   The initial vector
+   Set an initialization vector
+   @param IV   The initialization vector
    @param len  The length of the vector (in octets)
    @param cbc  The CBC state
    @return CRYPT_OK if successful

src/modes/cbc/cbc_start.c

@@ -18,7 +18,7 @@
 /**
    Initialize a CBC context
    @param cipher      The index of the cipher desired
-   @param IV          The initial vector
+   @param IV          The initialization vector
    @param key         The secret key
    @param keylen      The length of the secret key (octets)
    @param num_rounds  Number of rounds in the cipher desired (0 for default)

src/modes/cfb/cfb_getiv.c

@@ -16,9 +16,9 @@
 #ifdef LTC_CFB_MODE
 
 /**
-   Get the current initial vector
-   @param IV   [out] The destination of the initial vector
-   @param len  [in/out]  The max size and resulting size of the initial vector
+   Get the current initialization vector
+   @param IV   [out] The destination of the initialization vector
+   @param len  [in/out]  The max size and resulting size of the initialization vector
    @param cfb  The CFB state
    @return CRYPT_OK if successful
 */

src/modes/cfb/cfb_setiv.c

@@ -16,8 +16,8 @@
 #ifdef LTC_CFB_MODE
 
 /**
-   Set an initial vector
-   @param IV   The initial vector
+   Set an initialization vector
+   @param IV   The initialization vector
    @param len  The length of the vector (in octets)
    @param cfb  The CFB state
    @return CRYPT_OK if successful

src/modes/cfb/cfb_start.c

@@ -19,7 +19,7 @@
 /**
    Initialize a CFB context
    @param cipher      The index of the cipher desired
-   @param IV          The initial vector
+   @param IV          The initialization vector
    @param key         The secret key
    @param keylen      The length of the secret key (octets)
    @param num_rounds  Number of rounds in the cipher desired (0 for default)

src/modes/ctr/ctr_getiv.c

@@ -16,9 +16,9 @@
 #ifdef LTC_CTR_MODE
 
 /**
-   Get the current initial vector
-   @param IV   [out] The destination of the initial vector
-   @param len  [in/out]  The max size and resulting size of the initial vector
+   Get the current initialization vector
+   @param IV   [out] The destination of the initialization vector
+   @param len  [in/out]  The max size and resulting size of the initialization vector
    @param ctr  The CTR state
    @return CRYPT_OK if successful
 */

src/modes/ctr/ctr_setiv.c

@@ -16,8 +16,8 @@
 #ifdef LTC_CTR_MODE
 
 /**
-   Set an initial vector
-   @param IV   The initial vector
+   Set an initialization vector
+   @param IV   The initialization vector
    @param len  The length of the vector (in octets)
    @param ctr  The CTR state
    @return CRYPT_OK if successful

src/modes/ctr/ctr_start.c

@@ -19,7 +19,7 @@
 /**
    Initialize a CTR context
    @param cipher      The index of the cipher desired
-   @param IV          The initial vector
+   @param IV          The initialization vector
    @param key         The secret key
    @param keylen      The length of the secret key (octets)
    @param num_rounds  Number of rounds in the cipher desired (0 for default)

src/modes/f8/f8_getiv.c

@@ -16,9 +16,9 @@
 #ifdef LTC_F8_MODE
 
 /**
-   Get the current initial vector
-   @param IV   [out] The destination of the initial vector
-   @param len  [in/out]  The max size and resulting size of the initial vector
+   Get the current initialization vector
+   @param IV   [out] The destination of the initialization vector
+   @param len  [in/out]  The max size and resulting size of the initialization vector
    @param f8   The F8 state
    @return CRYPT_OK if successful
 */

src/modes/f8/f8_setiv.c

@@ -16,8 +16,8 @@
 #ifdef LTC_F8_MODE
 
 /**
-   Set an initial vector
-   @param IV   The initial vector
+   Set an initialization vector
+   @param IV   The initialization vector
    @param len  The length of the vector (in octets)
    @param f8   The F8 state
    @return CRYPT_OK if successful

src/modes/f8/f8_start.c

@@ -19,7 +19,7 @@
 /**
    Initialize an F8 context
    @param cipher      The index of the cipher desired
-   @param IV          The initial vector
+   @param IV          The initialization vector
    @param key         The secret key
    @param keylen      The length of the secret key (octets)
    @param salt_key    The salting key for the IV

src/modes/ofb/ofb_getiv.c

@@ -16,9 +16,9 @@
 #ifdef LTC_OFB_MODE
 
 /**
-   Get the current initial vector
-   @param IV   [out] The destination of the initial vector
-   @param len  [in/out]  The max size and resulting size of the initial vector
+   Get the current initialization vector
+   @param IV   [out] The destination of the initialization vector
+   @param len  [in/out]  The max size and resulting size of the initialization vector
    @param ofb  The OFB state
    @return CRYPT_OK if successful
 */

src/modes/ofb/ofb_setiv.c

@@ -16,8 +16,8 @@
 #ifdef LTC_OFB_MODE
 
 /**
-   Set an initial vector
-   @param IV   The initial vector
+   Set an initialization vector
+   @param IV   The initialization vector
    @param len  The length of the vector (in octets)
    @param ofb  The OFB state
    @return CRYPT_OK if successful

src/modes/ofb/ofb_start.c

@@ -19,7 +19,7 @@
 /**
    Initialize a OFB context
    @param cipher      The index of the cipher desired
-   @param IV          The initial vector
+   @param IV          The initialization vector
    @param key         The secret key
    @param keylen      The length of the secret key (octets)
    @param num_rounds  Number of rounds in the cipher desired (0 for default)